Wastewater management

Wastewater Management

Peter Metzen, HPCEize Drenth, Antea Group

Confidential – © Inogen Environmental Alliance 2016

Content:• Introduction • Standard types of discharge• Scope of consulting for industrial clients• Recycling of discharge type 1 – Example Food industry• Recycling of discharge type 2 – Example Textile industry• Recycling of discharge type 3 – Example Industrial park• Conclusion


Introduction• Closed loop for water is a common wish for most industrial

wastewater producers• What means „closed loop“?

- Installation of maximum possible rate for reuse or recycling of treated wastewater- Reduction of water footprint- Reduction of environmental impact

- Zero emission of wastewater is under normal commercial conditions not possible


Industrial clients

Scope of consulting/engineering in industrial wastewater projects

• Preparation of a wastewater cadastre• Evaluation of actual costs for wastewaterdisposal • Definition of quality requirements for reuse of water in production• Evaluation of actual or expected legislation • Identification of future cost and possible savings• New developments and new process technologies• Concept for watermanagement in production• Technical/commercial report as base for a decision

After Decision of client:• Detail Design and all engineering services needed for the treatmentplant and waterrecycling• Start of plant operation and training of staff • Engineering and Installation


Industrial clients

Scope of works for wastewater cadastre

• Integrated Status analysis (Fresh water, wastewater, wastes)• Preparation of a wastewater cadastre

• Wastewater flows and wastewater sources and waterquality (analytic)• Are different wastewater types collected together or separately?• What Quality requirements for reuse of water are relevant?

Example:


Standard types of discharge

Industrial plant

Municipal Wastewater Treatment Plant

River

direct discharger

indirect discharger efflue

nt

wastewater

Industrial wastewater treatment plant

Pretreated

discharge


Standard types of discharge

direct discharger

indirect discharger

CN = 5 m-1

CN = 25 m-1

CN = 85 m-1

raw wastewater

example:different effluent qualities after treatment


Recycling of discharge type 1

Industrial plant wastewater

Recycling XX %


Municipal Wastewater Treatment Plant

River

efflue

ntindirect


SituationThe malthouse formerly had the status of a direct discharger and was forced by the local authority to become a indirect discharger.

Consequences for malthouse• Price for the wastewater discharge into sewer system: 2,88 €/m³• Yearly fee for wastewater discharge: appr. 1.500.000,- € per year

Example: Food Industry

Without recycling

fresh water demand: 70 m³/hwastewater: 56 m³/h

With recycling 80%

fresh water demand: 26 m³/hwastewater: 12 m³/h



Solution designedReduce the wastewater quantity from 100% to 20% by designing a complex water recycling.• 80 % of the water is recycled to drinking water quality (appr. 420.000 m³/a) and

used in production• 20 % of the water is discharged (appr. 105.000 m³/a)• Invest of recycling plant: 1.250.000,- €• Spec. price of recycling: appr. 1,20 €/m³ versus 2,88 €/m³ for disposal

Benefits for malthouse• Saving on wastewater fee: appr. 705.000,- € per year• Saving on rainwater fee: appr. 280.000 € per year



Recycling of discharge type 2

Industrial plant

Municipal WWTP

indirect

discharge

wastewate

r Industrial wastewater treatment plant

Treatmenteffluent

Example: Textile Industry

recycling water streamanaerobictreatment

biomass

aerobictreatment

biomass-separation

wastewater streamanaerobictreatment

aerobictreatment

biomass-separation

biomass

well water

conditioning

municipalwastewatertreatment plantproduction

pre-treatmentdyeingprintingtighteningwashing

aerobic treatmentwith membrane filtration

filtrate

biomass

process water

storagetank

oxidative treatment

for decolorisation

ozone

flow chart

Specification and Requirements:

Crude waterDOC: 209 - 367 [mg/l]colour number CN49 - 115 [1/m]

Pre-treatment of wastewater for further treatment in urban waste treatment plant (wastewater stream)

Treatment of wastewater for reuse in textile factory (recycling water stream)

Example: Textile Industry


Recycling of discharge type 3Industrial Park

Industrial plant

River

direct dischargewastewater

recycling XX %


Treatment


Example: Industrial Park

Turn-Key- wastewater treatment- complexe cyanide- infl. 190 mg/l effl. 0,9 mg/l- CE-declaration- NRB-directives- BRL-directives- construction/engineering- Mechanical en Electrical- delivery: December 2016

Manufacturer- herbicide (dichlobenil)- synth. oil voor windturbines- worldwide approx. 900 MEuro

Roadmap- 2 year research with client- tech-partner Van Remmen UV Techniek B.V.



EU-wastewater derectives:- prohibited to discharge waste water to the surface water- change in content waste water

Question:• Ammonium 50 mg/l• Cyanide totaal 160 mg/l• Indamp rest 41 g/l• Chloride 3200 mg/l• Carbonaat 13.700 mg/l• Bicarbonaat 17.000 mg/l• Natrium 13.000 mg/l• pH 11




Standard solution in the past for industrial plants Discharge of the wastewater without recycling

Reasons for water recycling• reduction of costs • in some regions: unsufficient water supply• reduction of water footprint• environmental foot print• new developments

Technical view• the higher the recycling quote the bigger the costs• recycling quote up to 60 – 80 % save costs• 100% closed loop is almost not possible • residuals (salts, screenings, concentrates etc) have to be disposed

Conclusion


Date post:	15-Apr-2017
Category:	Environment
Upload:	kurt-bouckenooghe
View:	39 times
Download:	0 times