Ingoldmells WwTW OMP 1
ANGLIAN WATER SERVICES LTD.
Ingoldmells Wastewater Treatment Works
Odour Management Plan
This document must be reviewed at intervals not exceeding 12 months
Revision Authors Date of Issue Comments
1.0 G. Waring, A Lamyman March 2013
1.1
1.2
1.3
1.4
1.5
2.0
2.1
2.2
Page 17
Ingoldmells WwTW OMP 2
CONTENTS
1 OVERVIEW .................................................................................................................................43
1.1 INTRODUCTION ...................................................................................................................... 43
1.2 ODOUR MANAGEMENT PLAN STRUCTURE ............................................................................... 54
1.3 OVERVIEW OF SITE OPERATIONS ............................................................................................ 65
2 SITE MANAGEMENT ...............................................................................................................97
2.1 MANAGEMENT STRUCTURE .................................................................................................... 97
2.2 ROLES AND RESPONSIBILITIES ................................................................................................ 97
2.3 TRAINING ............................................................................................................................. 108
3 ODOUR RISK ASSESSMENT ................................................................................................ 108
3.1 METHODOLOGY ................................................................................................................... 108
3.2 SUMMARY OF MAIN RISKS AND CONTROLS ........................................................................... 108
4 CONTROL MEASURES ........................................................................................................ 1310
4.1 MANAGEMENT OF ODOROUS MATERIALS & PROCESSES ..................................................... 1310
4.2 PRO-ACTIVE MANAGEMENT ............................................................................................... 1311
4.3 REACTIVE MANAGEMENT .................................................................................................. 1512
4.4 CONTINGENCY AND EMERGENCY PLANNING ..................................................................... 1613
5 MONITORING PROCEDURES ........................................................................................... 1815
5.1 MONITORING OF ODOURS ................................................................................................... 1815
5.2 COMPLAINT MANAGEMENT ............................................................................................... 1615
5.3 COMMUNITY ENGAGEMENT .............................................................................................. 1615
6 ODOUR RISK ASSESSMENT .............................................................................................. 1916
7 WORKS TECHNICIANS ROUTINE OCU ACTIVITY SHEET ...................................... 2420
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Ingoldmells WwTW OMP 3
8 SUMMARY OF RECENT AND FUTURE ODOUR IMPROVEMENT WORKS .......... 2622
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Ingoldmells WwTW OMP
4
1O
verv
iew
1.1
Introd
uctio
n
The Anglian Water site at Ingoldmells is located at:
Ingoldmells Wastewater Treatment Works
Boltons Lane
Ingoldmells
Lincolnshire
PE25 1JJ
Grid Reference: TM 5595 6767
The Ingoldmells catchm
ent, that is the area draining to the Ingoldmells Sewage Treatment Works Sea Outfall, covers an extensive area comprising a large section of the Lincolnshire holiday coast including
Skegness, Ingoldmells, Chapel St. Leonards and Anderby Creek, together with a number of widely separated inland villages, namely Addlethorpe, Burgh le Marsh, Hogsthorpe, Huttoft, Orby, Mum
by, Willoughby,
and part of Croft (Croft Lomax).
The catchm
ent serves an approximate total resident population of 31,931 however the resident population is increases to approximately 58,533 during the holiday season. The site has a split consent to reflect
this, for the summer period the consent for full flow to treatment is 550l/s and during the winter period the consent is 300l/s.
Ingo
ldm
ells
Ww
TW
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Ingoldmells WwTW OMP
5
An annotated plan of the WwTW is shown below:
InletWorks
SAS
Tank
Primary
Tank2
Primary
Tank3
Primary
Tank1
FianlSettlement
Tank3
Final
Settlement
Tank1
Final
Settlement
Tank2
Sludge
Thicke
ners
Sludge
Blending
Tank
Storm
Tank
Garages
Storm
well
outfallstation
GeneratorNo2
Fuelstorage
Inlet
well
Oldworks
Usedfor
storage
LowLevel
PS
AerationDitchs
Aeration
BlowerUnit
Wash
Water
BoosterSt
CIFUnit
Storm
wells
Distribution
Chamber
Genyno1
InletpumpSt
Foul&Storm
Pumps
Office
SludgeTreatm
entCentre
ConveyerTankerBay
Sludge
Centrifugies
ControlRoom
&Lab
Chemical
dosingunit
Odour
Control
Unit
IngoldmellsGeneralLayout
SludgePumps
F/T
Distribution
Chambers
Primary
Distribution
Chamber
Sludge
Pumps
Reaeration
3
Aeration
2
Aeration
1
Workshop
Store
Wash
Water
PumpSt
Workshop
ElecMain
Incomer
Septic
Waste
Odour Suppression sprays
1.2
Odo
ur m
anag
emen
t pl
an s
truc
ture
The OMP outline the managem
ent system
s in place to ensure comprehensive and coherent managem
ent of odour issues on the Ingoldmells site. They outline the procedures for odour monitoring, dealing with
complaints and guidelines to ensure a common approach to resolving odour problems
This OMP follows the following structure:
Overview of operations.
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Ingoldmells WwTW OMP
6
Managem
ent structure and responsibilities.
Identification of potential sources of odours.
Identification of potential receptors.
Assessm
ent of risk associated with these sources.
Control measures required to prevent / minimise the risks.
Contingency / em
ergency planning.
Monitoring procedures to assess the effectiveness of control measures
Com
plaints managem
ent procedure.
Record keeping
1.3
Ove
rvie
w o
f si
te O
pera
tions
Pre
limin
ary
Tre
atm
ent
Flows are received from
eight rising mains from
terminal pumping stations, some additional flows are pumped into the raw sewage wet well and subsequently pumped up to the Headworks.
Once at the headworks flows pass through the 2 detritors and then on to drum
screens where the incoming sewage is screened to remove plastics and rags into a skip for disposal, following maceration and
dewatering.
The first stage of preliminary treatment is via the detritors which slow down the sewage to settle out heavy the particles like grit and sand which is removed from
tanks into grit skip before disposal to land.
Skips are em
ptied weekly by a contracted disposal firm.
Prim
ary
Tre
atm
ent
After leaving the Headworks the flows then move on to the primary distribution cham
ber where it mixes with the return liquors from
the sludge thickening operation. There are three primary radial flow settlem
ent
tanks. Suspended solids are removed intermittently using auto desludging to prevent the build up of sludge in the tanks. The solids then are pumped up to the sludge blending tank, this de-sludging operation
has a potential to be an intermittent source of odour.
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Ingoldmells WwTW OMP
7
Sec
onda
ry T
reat
men
t
After settlem
ent in the primary tanks the flow is pumped up to the activated sludge plant where it mixes with RAS in a selector zone before passing forward onto three activated sludge lanes running in parallel.
Fin
al S
ettle
men
t
The flow from
the activated sludge plant is passed through a distribution cham
ber onto three radial flow final settlem
ent tanks where polyelectrolyte is added to aid settlem
ent. Final effluent passes through the
sample point cham
ber onto the Final effluent pumps which direct flow down the long sea outfall to the North Sea. The settled solids from
the Final Settlement Tanks are collected in the Returned Activated
Sludge (RAS) / Surplus Activated Sludge (SAS) well where a proportion is returned to the Activated Sludge Plant and the remainder pumped to the Surplus Activated Sludge holding tank
Slu
dge
Tre
atm
ent Pro
cess
The SAS removed from
the bottom of the final tanks is initially stored in the SAS tank where it is then pumped through two drum
thickeners before being mixed with primary sludge in the sludge blending tank.
From the blending tank the blended sludge goes though a macerator before being pumped to the centrifuges for dewatering. The centrifuged cake is then collected in trailers ready for removal off-site to Canwick
STC for lime treatment.
Odo
ur c
ontrol
The main sources of odour are currently treated with odour suppression sprays, the location of the spray units are detailed in the annotated plan above.
Fut
ure
Odo
ur C
ontrol
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Ingoldmells WwTW OMP
8
If required, options to further improve the odour control at the STW are currently being evaluated. These may involve the extraction of odourous gases from identified hot spots on the site and/or the chem
ical
dosing of returned liquors on the STW.
The improved process would be scheduled for installation in 2013/14
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Ingoldmells WwTW OMP
9
2 Site
man
agem
ent
2.1
Man
agem
ent st
ruct
ure
Ingoldmells STW is part of Anglian Water’s Lincolnshire catchm
ent. The managem
ent structure in relation to Ingoldmells STW is shown below:
2.
2 R
oles
and
res
pons
ibili
ties
Ingoldmells STW is managed by a site based Treatment Manager and a permanent staff of Process Controllers and two Process Optimisers (Works Technicians).
Technicians are responsible for ensuring all assets associated with effective operation of the site are operating correctly and are also responsible for minor maintenance. Works technicians are also responsible for
clearing up accidental spillages of materials which could give rise to odours if left.
In addition
to the
site based
staff, a
team
of electricians and
fitters under a
Maintenance Contract Manager carry out electrical and mechanical maintenance. Planned inspections of plant and machinery are
carried out
The site managers are responsible for ensuring adequate communications are maintained with personnel responsible for other plants and services which impact on the treatment process, and ensure that necessary
measures are taken to resolve operational problems impacting Ingoldmells STW.
Catc
hm
en
Manage
r
Ta
ctica
l S
up
po
rtM
anage
rT
reatm
en
Manage
r
Work
s
Technic
ians
–P
roce
ss
Op
tim
ise
r X
2
Work
s
Technic
ians
–P
roce
sC
ontr
olle
rsx11
Str
ate
gic
Waste
Pla
nne
Main
tenance
Co
ntr
acto
rM
anage
r
Opera
tional
Managem
ent
Centr
(OM
C)
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Ingoldmells WwTW OMP
10
2.3
Tra
inin
g
All staff have received sufficient training appropriate to their role as summarised below
Job
Rol
e N
umbe
r of
staf
f
Tra
inin
g
Com
plet
ed
DA
TE
Fut
ure
Tra
inin
g
Nee
ds
DA
TE
Tre
atm
ent
Man
ager
1 CoTC – 4TMNH
LTO – License
to Manage
2002
2010
. OCU
manufacturers
training
2014
Pro
cess
Opt
imis
er
2
Licence to
Operate
Pre
2012
OCU
manufacturers
training
2014
Pro
cess
Con
trol
ler
12
Sludge
Treatment
(HACCP) PQ
Licence to
Operate
Pre
2012
OCU
manufacturers
training.
2014
3 O
dour
ris
k as
sess
men
t
3.1
Met
hodo
logy
An odour risk assessment was completed for the site. The purpose of the assessment is to identify potential sources of odour and the receptors, to quantify the risk associated with the odour source and the
managem
ent controls required to minimise this risk.
3.2
Sum
mar
y of
mai
n risk
s an
d co
ntro
ls
All stages of the STW have been identified as potential sources of odour. The main odour risk sources are:
Inlet works – off site pumping station discharges
Storm tanks
Screenings handling.
Prim
ary tanks and de-sludge wells.
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Ingoldmells WwTW OMP
11
Odour suppressions sprays have been installed at key locations to minimise the potential for odour nuisance. Onsite locations of odour suppression sprays are:
Inlet system
Splitting cham
bers on the primary settlem
ent tank
Sludge storage tank
Gravity inlet sewer
Septic waste imports
Wastewater treatment processes all have the potential to em
it odours. The design of the plant enables the processes to be operated in a way to minimise odour em
issions. However, under conditions where the
wastewater or sludge becomes anaerobic, eg during storage, this may not be possible, and containm
ent and reduction facilities may be required.
The stages of wastewater treatment identified as being potential sources of odour at Ingoldmells STW are included in the materials inventory.
The Odour risk assessment is presented in Section 7.
Mat
eria
ls Inv
ento
ry
The following table comprises the inventory of odorous materials at the WwTW site.
Pot
entia
l O
dour
Sou
rce
Cur
rent
con
trol
mea
sure
s
Inle
t w
orks
– o
ff s
ite p
umpi
ng s
tatio
n
disc
harg
es
Pum
p stations currently being dosed are:
Skegness Richm
ond Drive
Skegness Churchill Avenue
Burgh le Marsh Storeys Lane
Chapel St Leonards TPS
Ingoldmells The Haven TPS
Som
e of the outlying pumping station have
odour control chem
ical dosed as result of
septicity being identified within the immediate
catchm
ent. Odour dosing equipm
ent is
maintained by a specialist contractor
Priva
te d
rain
age
netw
orks
The catchm
ent has a distinct propensity
for high levels of septicity to be
generated within private sewers
connecting caravan parks and other
commercial prem
ises with the public
sewer network.
AW are working with EHO to compile a list
of private sewage pumping stations to assist
in evaluating the potential for septicity
generated within private networks
Inle
t w
orks
– s
eptic
tan
ker
disc
harg
e po
int
Potential odour release from
tankers
Signage on site – pictorial format
Duty of care sheets which enable site to
Page 27
Ingoldmells WwTW OMP
12
Pot
entia
l O
dour
Sou
rce
Cur
rent
con
trol
mea
sure
s
when discharging
monitor imports
Weighbridge
Odour suppression spays are fitted with
motion sensors
Inle
t W
orks
There is a potential for odours at the
skip area if the screens or compactors
fail.
Skips are changed as required or when full
to minimise odours
Routine Activities are carried out at the inlet
as planned
Inlet screen faults have alarm points on
telemetry
Prim
ary
Tan
ks
The surface of the primary tanks is a
significant odour source when the tanks
are operating with high levels of
retained sludge.
Prim
ary tank sludge depths recorded weekly.
Autom
atic desludging of primary tanks
Prim
ary
Tan
k D
e-sl
udge
Cha
mbe
rs
Intermittent odour source when auto-
desludging takes place.
Desludge cham
bers are covered
Act
ivat
ed S
ludg
e (A
S) Pla
nt Potential
odour from
stripping residual septicity at
head of AS plant.
Maintain minimum
loading on AS plant
MLSS optim
um below 3000 mg/l. Max
5000 mg/l.
Fin
al S
ettle
men
t
Layer of sludge on surface can
intermittently cause odours
Autom
atic desludging of final tanks
Slu
dge
trea
tmen
t pr
oces
s
Potential odour release from
processing
of sludge
Sludge tanks are covered
Any spillages are dealt with as detailed in
section 3.2
Sto
rm T
anks
Potential for odour generation when
emptied.
Odour eradicated through using cleaning
pumps in tanks, floor washed during cleaning
cycle
Old
Sto
rm S
ettle
men
t Tan
k. Potential
odour generation from
sludge settlem
ent.
Rem
ove odour potential by keeping tank
empty and clean.
Iden
tific
atio
n of
rec
epto
rs
Page 28
Ingoldmells WwTW OMP
13
The main receptors for odour are within the vicinity of Ingoldmells STW and are located at
Residential properties High Street, Ingoldmells
Residential properties at Windsor Crescent
Residential properties at Festival Avenue
Residential properties and Medical Centre on Skegness Road, Ingoldmells.
Caravan Parks / Holiday Cam
ps
4C
ON
TR
OL M
EA
SU
RES
4.1
Man
agem
ent of
odo
rous
mat
eria
ls &
pro
cess
es
Odorous materials can be managed in two distinct ways:
Pro-active managem
ent
Reactive managem
ent
Pro-active managem
ent concentrates on routine measures to minimise odour em
issions by good practice in the operation of the processes on site.
Reactive managem
ent of odour em
issions is the activity taken to reduce odour em
issions when a potential em
ission to atmosphere is identified.
At the STW, It is not possible for the site operators to divert incoming sewage away from
the site if there is a problem. It is therefore essential for the treatment processes on site to remain operational at all
times.
4.2
Pro
-ac
tive
man
agem
ent
Good house keeping plays an essential part in reducing odour em
issions from
the site. Site operators perform daily site inspections to ensure there are no spillages from
tanks. Any spillages are to be cleaned
up as soon as possible. Tanks that have been taken out of service must be kept em
pty and clean to avoid odour.
All Works Technicians at Ingoldmells STW
have a
responsibility
to maintain
good housekeeping and
clear spillages at the
earliest opportunity to prevent unnecessary odour. Anglian
Water has a
purchase
agreem
ent which is managed by RTS who can provide additional clean up services at short notice. Works Technicians have been given specific authority for out-of-hours contract.
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Ingoldmells WwTW OMP
14
Key areas at risk from
spillage and control measures.
The key areas at risk from
spillage and associated control measures are as follows:
Com
pactor/screen area.
Works Technicians to maintain good house keeping and hose down any spillages. Also prom
pt action is required if any part of the plant breaks down
RAM pumps (Prim
ary Settlement Tanks)
Works Technicians to maintain good house keeping and hose down any spillages. Also prom
pt action is required if any part of the plant breaks down
Sludge building
Works Technicians to maintain good house keeping and hose down any spillages
Septic discharge point
Motion sensors are installed which activates odour suppression spays when a tanker passes through sensor.
Daily inspections by site operators
Routine site inspections by Treatment Manager - a minimum
of once per month.
Works Technicians day-to-day schedules are managed by the OMC to ensure that sickness and holidays are managed centrally across all sites and critical activities are given the highest priority. The system
implem
ented allows for one technician to be on site during working hours and call upon a second resource if required. Out of hours there is always a standby technician to respond to any breakdowns and this
allows coverage 365 days.
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Ingoldmells WwTW OMP
15
Scheduled daily jobs include the routine operational maintenance and monitoring of all odour abatem
ent equipm
ent. Odour abatem
ent equipm
ent is maintained by site staff in accordance with suppliers’ instructions.
Additional maintenance beyond the scope of site staff is scheduled as part of the Ingoldmells maintenance plan and instructions are passed to maintenance staff via the ‘Click’ system
. ‘Click’ is a computer
based scheduling system
that deploys work directly to Works Technicians laptops and records jobs completed onto a central SAP work managem
ent system
.
4.3
Rea
ctiv
e M
anag
emen
t
Con
trol
of se
ptic
ity in
the
risi
ng m
ains
Following an extensive catchm
ent survey Nitrate dosing has been implem
ented in those incoming sewers with particular odour issues to limit septicity. Dosing is controlled on a flow and temperature basis to
ensure an optim
um dosing is maintained especially during hot weather conditions.
There are
seven
rising
mains from
pump
stations and
a gravity sewer that transfer sewage
to the
Ingoldmells STW. Three of these
rising
mains have been identified
as causing
septicity. The sites are
Skegness Richm
ond Drive (SKRISM) Skegness Churchill Avenue (SKCHSM) and Chapel St Leonards Old Works (CHWOSM). All 3 sites discharge in to the inlet headworks onsite at Ingoldmells STW.
Skegness Churchill Avenue: RM length 3350m.
Estimated DWF: 900 cu.m
Skegness Richm
ond Drive: RM length 5,500m.
Estimated DWF: 3,700 cu.m
Chapel St Leonards Old Works: RM length 4,716m.
Estimated DWF:1,100 cu.m
In the Ingoldmells catchm
ent, with virtually no gravity sewers, septicity will develop in the rising mains overnight as the outlying pumping stations do not have enough incoming flow between midnight and 7:00 am
to pump the volume of the rising main. This applies equally to the outlying pump stations as it does to the individual pumping stations on many of the holiday parks. This is then compounded by further
pumping the sewage for several thousand meters a process taking several hours, to the works.
Des
ludg
ing
of the
prim
ary
settle
men
t ta
nks
In the operational tanks available for duty the de-sludging is managed to limit the retention tim
e of sludge in each tank therefore minimising the potential for septicity.
This is achieved by desludging the tanks regularly on a daily basis to maintain the sludge blanket level at an optim
um level across all tanks.
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Ingoldmells WwTW OMP
16
Prim
ary tanks are also dipped periodically by Works Technicians to measure the blanket depth.
Cle
anin
g of
the
sto
rm tan
ks
When the storm tanks have been used, the storm water will be returned for treatment at the earliest opportunity.
During the em
ptying process mixers are automatically activated to ensure settled residues are lifted into the returned storm water, thereby minimising residual solids in the tank and potential for odour em
issions.
Oth
er
Should elevated odour em
issions be identified by operators or complaints received, investigation into the source of the odour will be conducted.
4.4
Con
tinge
ncy
and
Em
erge
ncy
Pla
nnin
g
Bre
akdo
wns
In the event of a breakdown the responsible person creates a job which is then raised via Anglian Water’s Operational Managem
ent Centre (OMC). The response tim
e for remedying breakdowns is dependant
upon the criticality of the plant, response codes are:
A0
Within 1 hour.
A1
Within 4 hours.
A2
Within 1 day.
A3
Next day.
A4
Next 2 days.
Critical plant has been identified and given the appropriate priority. Jobs are allocated by the OMC via our electronic scheduling tool, ‘Click’. This identifies an appropriately qualified person who is able to
respond within the tim
escales determined by the response code.
The site holds many spares for key equipm
ent and framework arrangem
ents are in place for critical plant including lead tim
es for delivery to site. In addition, maintenance contracts are in place with many
suppliers and include the requirement for them
to store spares on Anglian Water’s behalf.
Flo
od, Fire
and
Ext
rem
e w
eath
er.
Hot and dry weather is likely to increase odour em
issions by increasing evaporation rates, reducing dispersion when wind is low and increasing the residence tim
es in the sewers leading to increased septicity and
odour em
issions. Heavy rain after dry weather will produce a first flush of strong sewage likely to cause odour at the inlet works as well as overflowing to the storm tanks where raw sewage can be stored for
some tim
e. It is therefore essential that the inlet works and storm tanks are managed closely to avoid odour nuisance during changing or extrem
e weather conditions.
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Ingoldmells WwTW OMP
17
Problem
atic sewers have been identified and Nitrate dosing installed to mitigate the effect of septicity during hot and dry weather conditions. An H2S monitor at the inlet works continuously monitors the efficiency
of the system
, allowing the operators to make adjustments to the system
and identify other potentially problematic areas. The readings and outcom
es are reviewed on a monthly basis to ensure the continued
success of the mitigation measures and identify other potential measures that may be required. The storm flows that accumulate in the storm tanks are returned to the inlet works for treatment in the WwTW as
soon as flows permit and the storm tanks will be cleaned after em
ptying to ensure odour em
issions from
residues are minimised.
Freezing can prevent the operation of valves, pumps and other equipm
ent leading to sludge build-up in the process. Trace heating/lagging is installed on critical plant to ensure continued operation through the
winter months. Snow fall or frozen roads can also limit access to the site limiting chem
ical deliveries. Should there be a need a contractor proactively grits access roads to site which ensures continued access
during cold weather.
Pow
er fai
lure
The site at Ingoldmells is equipped with two backup generators to run the site in case of a major power failure.
If necessary, Anglian Water also has a contract in place for hiring mobile generators at short notice.
Abn
orm
al o
pera
tion/
Con
stru
ctio
n
Any planned construction of a certain size on site will meet the requirements of CDM Regulations 2007. Such new works will require a Pre-Construction Site Managem
ent Plan which will be developed to cover
the
construction
and
commissioning
period
of proposed works. The strategy/plan will be continually reviewed in line
with site conditions
to ensure that the
process
capabilities
of the
works will not be
comprom
ised. Under the agreed delivery model, construction and commissioning gateway governance shall be completed and approved by key stakeholders, which includes the Operational Treatment Manager. The
document covers managem
ent of environm
ental impacts of the construction, including how odour is to be managed and minimised while work on site is on-going.
In the event that an activity is assessed as a medium or high risk of odour nuisance the activity shall be undertaken under an impact plan. Impact Plans are used by AWS to manage non routine activities that
have the
potential to impact on works compliance, health & safety and
custom
ers. The plan is designed to ensure appropriate controls, mitigation
and
communication
procedures have been identified
and
are
followed appropriate to the task. Such exam
ples where odour risk is identified and an impact plan is required, mitigation actions may include:-
Revised construction sequence and commissioning activities that shall reduce / remove odour generation
Revised commissioning sequence
Utilisation of existing odour control equipm
ent, possible extension via temp measures to accommodate additional areas
Provision of temporary odour reduction plant
Enabling new odour managem
ent plant earlier within construction programme
Provision of temporary sufficient spray system
s to mask odour.
The Regulators will be made aware of any event which may lead to a risk or temporary increase in odour, the mitigation measures put in place and tim
e scales for the work to be undertaken.
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Ingoldmells WwTW OMP
18
5M
onito
ring
pro
cedu
res
5.1
Mon
itoring
of od
ours
Monitoring of odours will be a combined effort by all site managers and site staff. All staff are expected to:
Ensure provision of Nutriox dosing in the network to reduce septicity in the influent wastewater.
Weekly check of primary sludge depth and desludging of PSTs.
Good house keeping including tim
ely cleanup of spillages.
Operation and monitoring of performance of odour suppression sprays.
Routine monitoring of sniff tests are carried out in areas around the site and close to potential receptors as identified
If an odour is detected on site, sources will be investigated on all sites to determine the source. If the source can be identified, actions will be taken to stop odour generation or stop the activity responsible.
If the activity cannot be stopped immediately for operational reasons, the Regulators will be informed, with a tim
e scale to affect a permanent solution.
A record is also maintained of any known off-site activities that may have an impact on odour, such as agricultural practices. This consists of an entry in the site log book showing relevant tim
e and date.
Inline Hydrogen sulphide monitors are installed at the inlet of the STW, this allows continuous monitoring and feedback to the Maintenance team
s as to the efficacy of the septicity dosing in the catchm
ent and
allows proactive adjustments to be made.
5.2
Com
plai
nt M
anag
emen
t
We receive odour complaints verbally, by em
ail, by letter or by the odour cards that we have issued to the residents. We will always acknowledge the complaint and respond to the custom
er, if needs be we
send a field technician or the CLM
may visit the custom
er. Any complaints made verbally through our call centre, by letter or by em
ail are recorded on SAP. If an odour card is sent back to us, we send a
new odour card back to the custom
er to acknowledge receipt of their feedback. Any issues are logged on a spreadsheet and this reviewed on a weekly basis.
5.3
Com
mun
ity E
ngag
emen
t The Rem
arkables, a public relations company, has been contracted to arrange pro-active public meetings and facilitate between the site and the public. This work will aim to:
Improve awareness of the improvem
ents to the works
Engage directly with local representatives to ensure a good understanding
Engage directly with residents to ensure they understand the investment / improvem
ent and also discuss in detail – on a one to one basis – any issues they may have regarding odour
Keep residents informed in the longer term
Ensure there is a forum for involvem
ent in the longer term
Assist AWS in mapping complaints and trends in complaints history
Page 34
Ingoldmells WwTW OMP
19
5.3
Fut
ure
impr
oved
Mon
itoring
The provision of a weather station is planned in 2013 / 14 to provide the following information
Atmospheric pressure.
Tem
perature.
Hum
idity.
Wind speed and direction.
Rainfall.
Wind direction will be considered before any non routine work likely to cause odour is carried out. The weather station data will also be used to investigate odour complaints or to determine the source of
odours during weekly sniff testing by site staff.
6O
dour
Ris
k A
sses
smen
t
Pot
entia
l O
dour
Sou
rce
Cur
rent
con
trol
mea
sure
s Fut
ure
Pro
posa
ls
Dat
e
Doc
umen
ts
All
of T
reat
men
t
Wor
ks
Com
mission specialist odour mapping
survey, to identify any odour hot spots
on Treatment Works
Identify and implem
ent odour control
solutions following odour mapping
survey
Ongoing investigation within the
catchm
ent where we dose into
strategic pumping stations to inhibit the
formation of septicity
Olfactom
etry analysis required to enable full
dispersion model run. Analysis is scheduled for
April to better represent warmer temperatures and
seasonal load. May allow for targeted investigation
of any subsequent odour complaints
April 2013
Inle
t w
orks
off s
ite
pum
ping
sta
tion
disc
harg
es
Pum
p stations currently dosed are
Skegness Richm
ond Drive, Skegness
Churchill Avenue and Chapel St
Leonards TPS
Continuous H2S measurement, data used to
optim
ise dosing rates.
There has been some suggestion the operation of
Page 35
Ingoldmells WwTW OMP
20
Pot
entia
l O
dour
Sou
rce
Cur
rent
con
trol
mea
sure
s Fut
ure
Pro
posa
ls
Dat
e
Doc
umen
ts
Ingoldmells Festival Avenue is causing odours to
vent near a property, possibly aggravated by high
water levels in the sewer – Further investigation is
required pending CCTV and hydraulic model output
Inle
t w
orks
-
sept
ic tan
ker
disc
harg
e po
int
Potential odour
release from
tankers when
loading.
Signage on site – pictorial format
Duty of care sheets which enable site
to monitor imports
Weighbridge
Odour suppression sprays are fitted
with a motion sensors
Odour logging indicates the septicity of the
combined imports when discharged at the inlet
reception is not significant. This would suggest
that reducing dispersion at the import cham
ber may
significantly reduce odour em
issions from
this point.
Modifications to the import cham
ber to be
considered.
Inle
t Scr
een
-
Fin
e
There is the
potential for
odours at the
skip area if the
screens or
compactor fails or
if there is an
increase in FOG
from
the
catchm
ent.
Skips are changed as required to
minimise odours or when full
Routine Activities are carried out at
the inlet as planned.
Inlet screen faults have alarm points
on Telem
etry.
Provision of new screenings and handling system
–
has been installed
Initiation of new FOG program centering on
Caravan Parks
Hea
dwor
ks
H2S that may be
present in the
Routine Activities are carried out at
the inlet as planned.
Installation of odour suppression
Page 36
Ingoldmells WwTW OMP
21
Pot
entia
l O
dour
Sou
rce
Cur
rent
con
trol
mea
sure
s Fut
ure
Pro
posa
ls
Dat
e
Doc
umen
ts
incoming sewage
from
the rising
mains
sprays
Provision of new screenings and
handling system
has been installed
which help prevent blockages and
odour
Prim
ary
trea
tmen
t
Sludge Blanket Detector and rotation
alarms
Autom
atic desludge of primary tanks
Desludge cham
bers are covered
Prim
ary
Tan
k D
e-
slud
ge C
ham
bers
Desludge cham
bers are covered
Act
ivat
ed S
ludg
e
(AS) Pla
nt
Activated sludge
plants- little
potential odour
Hi and Low Do alarms
Routine maintenance regime for RAS
and SAS removal
Maintain mixed liquors for optim
um
performance
Fin
al S
ettle
men
t
Layer of sludge
on surface can
intermittently
cause odours
Polyelectrolyte is added to aid final
settlem
ent
Autom
atic desluding
Chambers are covered
On going reduction of polymer following
optim
isation of the process
Sur
plus
act
ivat
ed
slud
ge
Has a high well alarm point linked to
telemetry
Page 37
Ingoldmells WwTW OMP
22
Pot
entia
l O
dour
Sou
rce
Cur
rent
con
trol
mea
sure
s Fut
ure
Pro
posa
ls
Dat
e
Doc
umen
ts
Slu
dge
trea
tmen
t
proc
esse
s
High sludge tank alarm point is linked
to telemetry.
Final commission of new sludge tank
removing the need to use open top
sludge storage tanks
Any spillages to be wash down as
necessary
August 2012
Dru
m T
hick
ener
s
Potential odour
release from
processing of
sludge.
Drum thickeners faults have alarm
points on telemetry
Cen
trifu
ges
Potential odour
from
hydrogen
sulphide release
during operation
and from
centrate
produced during
dewatering
process.
If odours occur to assess centrate in
the liquor well
Inside vented building
Forthcoming installation of the strain press will
create a significant release point for sludge related
odours. Dosing centrate upstream
of the PST
distribution could significantly reduce H2S released
in the sludge process
April / May
2013
Tan
kering
aw
ay o
f
slud
ge
Centrifuge cake is transferred to a
trailer inside building; truck is covered
with tarpaulin before leaving site.
Sto
rm tan
ks
Empties back to works after storm
event
Instigate cleaning of storm tanks
Cleaning of the storm tanks is activated
automatically
July 2011
Page 38
Ingoldmells WwTW OMP
23
Page 39
Ingoldmells WwTW OMP
A-24
7W
orks
Tec
hnic
ians
Rou
tine
activ
ity s
heet
Page 40
Ingoldmells WwTW OMP
A-25
Page 41
Ingoldmells WwTW OMP A-26
8 Summary of Recent and Future Odour Improvement Works
Summary of recent works undertaken to reduce odour at Ingoldmells WwTW
Item Works undertaken Status Comment
Control of
septicity in
rising mains
Improved management of Nitrate dosing
by profiling and seasonal adjustment to
further optimise the dosing.
On-going Loggers positioned as
inlet to indicate
septicity within the
sewage network.
Enables contractor to
adjust dosing.
Headworks
corrosion with
risk of odour
Provision of new screenings and
handling system has been installed
which help prevent blockages and
odour
Completed
Sludge Tanks Final commission of new sludge tank
removing the need to use open top
sludge storage tanks
Completed
Odour control Installation of new odour control system
which is maintained by a specialist
contractor
On-going Staff availability has
previously been an
issue but this has
improved due to
better training of staff
and a high priority
being given to this
task.
Page 42
Ingoldmells WwTW OMP A-27
Summary of proposed works to be undertaken to reduce odour at Ingoldmells WwTW
Item Works Proposed Date for implementation
Private
drainage
Network
The catchment has a number of private
pumping stations which discharge into the
catchment from holiday accommodation –
these are dormant in the close season.
AWS to work with the EHO, who will
compile a list of private pump stations.
AWS need to ensure these systems are
flushed though at the end of the
operating season to contain septicity
Pending confirmation from EHO
on the number of private pump
station. AWS will need to
review resource and cost
Odour Control
at Sludge
Treatment
Forthcoming installation of the strain
press will create a significant release
point for sludge related odours. Doing
centrate upstream of the PST distrubution
could significantly reduce H2S released in
the sludge process
Centrate dosing will be
implemented, initially on a trial
basis dependent upon a two
trial of two chemical.
Page 43
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