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WATER SERVICES AND SYSTEMS MANAGEMENT
1 8 0 R i v e r s i d e A v e n u e , M o u n t H o p e , T r i n i d a d Telefax: 1 .868 .638.2548 - M obi le : 1 .868 .319.0214 - e -mai l : w ssml td@gmai l .com
WASTEWATER MANAGEMENT PROPOSAL
P R O J E C T : WORLD OUTREACH CHURCH MINISTRIES
1 7 M O R N E C O C O R O A D , P E T I T V A L L E Y - T R I N I D A D
Prepared and Calculated by JEFFREY A. JAMES Dip Pl Cr, Dip Env. Mgmt. MTPATT
October 2013
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WASTEWATER MANAGEMENT PROPOSAL ©WSSM Ltd - 2013
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TABLE OF CONTENTS
1.0 INTRODUCTION 1
2.0 ESTIMATED POPULATIONS 2
3.0 WASTEWATER MANAGEMENT STRATEGY 2
4.0 WASTEWATER MANAGEMENT SYSTEMS 5
4.1 Conder Environmental Solutions Techflo SAF 5
4.1.1 Process and Plant Description 6
4.2 Disinfection 7
4.3 WWTP Seeding 8
4.4 Septic Tank System 9
4.4.1 Septic Tank 9
4.4.2 Soakaway Pit 9
4.5 Laundry 11
5.0 KITCHEN SINK 11
5.1 Grease Trap 12
Tables
1 ESTIMATED PEAK POPULATIONS 2
2 DAILY WATER CONSUMPTION PER STRUCTURE 3
3 DAILY WASTEWATER DISCHARGE PER STRUCTURE 4
4 PERMISSIBLE LEVELS COMPARISON 6
5 CALCULATIONS FOR SEPTIC TANK SYSTEM 10
6 GREASE TRAP CALCULATIONS 12
Figures
1 WWTP Process Flow diagram 7
2 Double Compartment Septic Tank 9
3 Kitchen Sink to Grease Trap Process Flow diagram 11
4 50lb capacity Grease Trap 12
Appendices
Plant loading Profile i - ii
Composition of Domestic Wastewater iii
Water Pollution Rule iv
Specifications for UV Units v - viii
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1 . 0 I N T R O D U C T I O N T h e W O R L D O U T R E A C H C H U R C H M I N I S T R I E S p r o p o s e s t o d e v e l o p a M U L T I -B U I L D I N G C O M P L E X o n 1 . 0 5 4 H e c t a r e s o f l a n d a t 1 7 M O R N E C O C O R O A D , P E T I T V A L L E Y a n d t h i s b u i l d i n g d e v e l o p m e n t w i l l c o n s i s t o f t h e f o l l o w i n g s t r u c t u r e s w i t h t h e i n t e n d e d u t i l i z a t i o n :
A l l P u r p o s e H a l l o C h u r c h S a n c t u a r y / C u l t u r a l C e n t r e o A c c o m m o d a t i o n f o r v i s i t i n g P a s t o r s o S e c u r i t y
H o s t e l o H o s t e l A c c o m m o d a t i o n
M i n i M a r t / F o o d C o u r t o S u p e r m a r k e t o C u l t u r a l / T r a i n i n g C e n t r e
T h i s r e p o r t s h o w s t h e W a s t e w a t e r M a n a g e m e n t c o n c e p t s , c o m p o n e n t s a n d m i t i g a t i n g m e a s u r e s t o b e i m p l e m e n t e d t o e n s u r e t h a t W a s t e w a t e r g e n e r a t e d f r o m t h i s p r o p o s e d d e v e l o p m e n t w i l l n o t n e g a t i v e l y i m p a c t t h e s u r r o u n d i n g n a t u r a l a n d b u i l t e n v i r o n m e n t s .
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2 . 0 E S T I M A T E D P O P U L A T I O N S T h e e s t i m a t e d p e a k p o p u l a t i o n s f o r t h e v a r i o u s s t r u c t u r e s a r e p r o j e c t e d t o b e a s f o l l o w s i n T a b l e 1 :
ESTIMATED PEAK POPULATIONS
STRUCTURE VISITORS STAFF POPULATION
1
All Purpose Hall 340
Church Sanctuary/Cultural Centre 300 20
Accommodation for visiting Pastors 8 2
Security 10
2 Hostel 60
Hostel Accommodation 50 10
3
Mini Mart/Food Court 62
Supermarket 20 6
Cultural/Training Centre 30 6
TOTAL POPULATION 462
Table 1
3 . 0 W A S T E W A T E R M A N A G E M E N T S T R A T E G Y I n o r d e r t o e f f e c t i v e l y a n d e f f i c i e n t l y m a n a g e b o t h B l a c k a n d G r a y W a s t e w a t e r D i s c h a r g e s f r o m t h e v a r i o u s s t r u c t u r e s w i t h i n t h e C o m p l e x , w e p r o p o s e t o u t i l i z e a s i n d i c a t e d i n T a b l e 3 :
T h r e e ( 3 ) i n d e p e n d e n t W a s t e w a t e r M a n a g e m e n t s y s t e m s I . t w o ( 2 ) C o n d e r E n v i r o n m e n t a l S o l u t i o n s - T e c h f l o S A F 3 5
I I . o n e ( 1 ) S e p t i c T a n k / S o a k a w a y A c c o r d i n g t o W A S A ’ s G U I D E L I N E F O R D E S I G N A N D C O N S T R U C T I O N O F W A T E R A N D W A S T E W A T E R S Y S T E M S I N T R I N I D A D A N D T O B A G O , W a t e r C o n s u m p t i o n [ T a b l e 2 . 1 , p p 1 1 ] a n d W a s t e w a t e r F l o w [ T a b l e 3 . 1 , p p 1 8 ] w i l l b e b a s e d o n t h e T Y P I C A L ( L i t r e p e r d a y ) C O N S U M P T I O N A N D D I S C H A R G E S
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DAILY WATER CONSUMPTION PER STRUCTURE
USER UNIT AMOUNT TYPICAL (LPD) CONSUMPTION
TOTAL CONSUMPTION
(LPD)
All Purpose Hall
Church Sanctuary/Cultural Centre
Seat 300 15 4500
Employee 20 83 1660
Accommodation for visiting Pastors
Guest 8 150 1200
Employee 2 75 150
Security Employee 10 50 500
Water Consumption for All Purpose Hall (lpd) 8,010
Hostel
Hostel Accommodation with Laundry Facilities
Guest 50 150 7500
Employee 10 75 750
Water Consumption for Hostel Accommodation with Laundry Facilities (lpd) 8,250
Mini Mart/Food Court
Supermarket
Person 20 6 120
Employee 6 50 300
Cultural/Training Centre/Food Court with Kitchen
Seat 30 15 450
Employee 6 75 450
Water Consumption for Mini Mart/Food Court with Kitchen (lpd) 1,320
Total Water Consumption for World Outreach Ministries (lpd) 17,580
Table 2
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Table 3
DAILY WASTEWATER DISCHARGE PER STRUCTURE
STRUCTURE UNIT AMOUNT TYPICAL
(LPD) DISCHARGE
TOTAL DISCHARGE
(LPD)
WASTEWATER MANAGEMENT
SYSTEM
1
All Purpose Hall
Conder Environmental Solutions - Techflo SAF 35
Church Sanctuary/Cultural Centre
Seat 300 12 3600
Employee 20 60 1200
Accommodation for visiting
Pastors
Guest 8 120 960
Employee 2 60 120
Security Employee 10 40 400
Wastewater Discharge (black and grey water) from All Purpose Hall 6,280 Litres per Day
2
Hostel Conder Environmental Solutions - Techflo SAF 35
Hostel Accommodation with Laundry Facilities
Guest 50 120 6000
Employee 10 60 600
Wastewater Discharge (black and grey water) from Hostel 6,600 Litres per Day
3
Mini Mart/Food Court
Septic Tank/Soakaway Pit
Supermarket
Person 20 5 100
Employee 6 40 240
Cultural/Training Centre/Food Court with Kitchen Sink
Seat 30 12 360
Employee 6 60 360
Wastewater Discharge (black and grey water) from Mini Mart/Food Court 1,060 Litres per Day
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4 . 0 W A S T E W A T E R M A N A G E M E N T S Y S T E M S
4 . 1 C O N D E R E N V I R O N M E N T A L S O L U T I O N S T E C H F L O S A F i s a p a c k a g e d s e w a g e t r e a t m e n t p l a n t i s d e s i g n e d t o t r e a t d o m e s t i c w a s t e w a t e r . D o m e s t i c W a s t e w a t e r i s e s s e n t i a l l y t h e s p e n t o r u s e d w a t e r f r o m t h e c o m p l e x , e m a n a t i n g f r o m p e r s o n a l , s a n i t a t i o n a n d d o m e s t i c u s e s . T h e e f f e c t i v e r e d u c t i o n o f t h e o r g a n i c m a t e r i a l e n t e r i n g t h e S e w e r a g e T r e a t m e n t P l a n t i s a c c o m p l i s h e d b i o l o g i c a l l y t h r o u g h m i l l i o n s o f m i c r o o r g a n i s m s ( b a c t e r i a ) . T h e s e b a c t e r i a d e g r a d e w a s t e w a t e r t h r o u g h t h e a d d i t i o n o f a t m o s p h e r i c o x y g e n a n d b i o c h e m i c a l r e a c t i o n .
T h i s p l a n t w i l l u t i l i z e S u b m e r g e d A e r a t e d F i l t e r ( S A F ) t e c h n o l o g y f o r o p t i m u m p e r f o r m a n c e a n d d e p e n d a b i l i t y , i t i s d e s i g n e d t o m a n a g e 7 m 3 ( 7 , 0 0 0 l i t r e s ) p e r d a y , i n c l u d i n g l a u n d r y w a s t e , ( g r e y w a t e r f r o m t h e K i t c h e n p a s s e s t h r o u g h a s t a t i c G r e a s e T r a p t h e n t o t h e S t o r m D r a i n a g e s y s t e m ) . U s i n g r e l i a b l e , c o s t e f f e c t i v e a n d e n e r g y e f f i c i e n t b l o w e r s f o r a e r a t i o n w i t h a n i n t e g r a l f l o w m a n a g e m e n t s y s t e m , t h e T e c h F l o S A F 3 5 w i l l b e i n s t a l l e d c o m p l e t e l y b e l o w g r o u n d .
A n t i c i p a t e d I n f l u e n t L o a d i n g s
I N F L U E N T W A S T E W A T E R B O D - 2 8 0 M G / L
D e s i g n e d i n a c c o r d a n c e w i t h t h e B r i t i s h W a t e r C o d e o f P r a c t i c e f o r F l o w s a n d L o a d s , t h i s P a c k a g e d S e w a g e T r e a t m e n t P l a n t o f f e r s t r e a t m e n t w h i c h s u r p a s s e s t h e l o c a l S p e c i f i c a t i o n s f o r L i q u i d E f f l u e n t f r o m D o m e s t i c W a s t e w a t e r T r e a t m e n t P l a n t s i n t o t h e E n v i r o n m e n t ( I n l a n d S u r f a c e W a t e r s ) a s i n d i c a t e d i n t h e W A T E R P O L L U T I O N R U L E S 2 0 0 1 , S e c o n d S c h e d u l e ( T a b l e 4 ) . I n a n e f f o r t t o m a i n t a i n t h e i n t e g r i t y o f t h e s y s t e m , w e w i l l a l l o w f o r a n i n e t y ( 9 0 ) d a y d e s l u d g i n g f r e q u e n c y , t o e n s u r e t h a t t h e q u a l i t y o f t h e d i s c h a r g e d l i q u i d e f f l u e n t m e e t s a n d s u r p a s s e s a l l p e r m i s s i b l e l e v e l s a s r e q u i r e d .
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PERMISSIBLE LEVELS COMPARISON
No. WATER POLLUTANTS
PERMISSIBLE LEVEL OR
CONDITION (mg/l)
DISCHARGE FROM
TECHFLO SAF (mg/l)
JUSTIFICATION
Parameters or Substances Inland Surface
Water
1 Temperature 35o C 27o C This plant discharges liquid effluent at 3oC above Ambient Temperature
2 Dissolved Oxygen Content (DO) <4 1 - 3 Air introduced in the Biological Treatment Zone increases aeration whilst stabilizing DO
3 Hydrogen ion (pH) 6 - 9 6.7 Appendix i. Case Study - Table 1
4 5 day Biological Oxygen Demand (BOD5 at 20o C)
30 14 Appendix i. Case Study - Table 1
6 Total Suspended Solids (TSS) 50 12 Appendix i. Case Study - Table 1
7 Total Oil and Grease (TO&G)or n-Hexane Extractable\Material (HEM)
10 DNA Data Not Available
8 Ammoniacal Nitrogen (NH3-N) 10 9 Plant reduces 80% Influent Ammoniacal Nitrogen - 41.5 (mg/l)
12 Total Residual Chlorine (Cl2) 1 0.02 Appendix i. Case Study - Table 1
28 Feacal Coliforms 400 428 Appendix i. Case Study - Table 1, NOTE: UV reduces 95% of Feacal
Coliforms
Table 4
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4 . 1 . 1 P r o c e s s a n d P l a n t D e s c r i p t i o n T h e T r e a t m e n t P r o c e s s – S u b m e r g e d A e r a t e d F i l t e r T e c h n o l o g y T h e u n i t i s s p e c i f i c a l l y d e s i g n e d t o t r e a t d o m e s t i c s e w a g e a n d o t h e r b i o d e g r a d a b l e w a s t e a n d c o m p r i s e s t h r e e t r e a t m e n t s t a g e s :
Figure 1 - WWTP Process Flow diagram
T h e s y s t e m u t i l i s e s m i c r o o r g a n i s m s t o b r e a k d o w n t h e s e w a g e b y p r o c e s s e s v e r y s i m i l a r t o t h o s e t h a t o c c u r i n a g a r d e n c o m p o s t h e a p . I t i s v e r y i m p o r t a n t t h e r e f o r e , t h a t t o x i c c h e m i c a l s d o n o t e n t e r t h e s y s t e m a n d " p o i s o n " t h e m i c r o o r g a n i s m s .
R a w s e w a g e i s f i r s t r e c e i v e d i n t h e P r i m a r y S e t t l e m e n t S t a g e , w h e r e g r o s s s o l i d s ( p r i m a r y s l u d g e ) s e p a r a t e i n t h e t a n k . T h e s e s o l i d s r e m a i n u n t i l t h e t a n k i s " d e - s l u d g e d " a s d e s c r i b e d i n t h e M A I N T E N A N C E s e c t i o n o f t h i s m a n u a l . T h e “ s e t t l e d ” l i q u o r i s d i s p l a c e d f r o m t h e P r i m a r y T a n k a n d f l o w s i n t o t h e b i o l o g i c a l t r e a t m e n t z o n e . I n c o m i n g f l o w m i x e s w i t h r e c y c l e d s e w a g e w i t h i n t h e b i o z o n e . T h i s r e c y c l e d f l o w g r e a t l y d i l u t e s t h e i n c o m i n g s e w a g e a n d p r e v e n t s " s h o c k " l o a d s f r o m u p s e t t i n g t h e s y s t e m .
T h e b l o w e r p r o v i d e s n e c e s s a r y o x y g e n f o r t h e m i c r o - o r g a n i s m s t o d i g e s t t h e n u t r i e n t s i n t h e b i o - z o n e . A i r i s b u b b l e d u p t h r o u g h t h e b i o - z o n e f r o m d i s t r i b u t i o n p i p e w o r k a n d i n s o d o i n g g e n e r a t e s a r e c i r c u l a t i n g f l o w . A s t h e l i q u i d m o v e s a r o u n d i n t h e b i o z o n e i t i s p u r i f i e d b y t h e m i c r o o r g a n i s m s g r o w i n g o n t h e s u r f a c e o f t h e m e d i a . E x c e s s b i o m a s s s o l i d s a r e t r a n s f e r r e d t o t h e h u m u s t a n k o r f i n a l s e t t l i n g t a n k b y d i s p l a c e m e n t , a s n e w l i q u o r e n t e r s t h e b i o -z o n e f r o m t h e p r i m a r y t a n k .
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T h e H u m u s s o l i d s s e t t l e t o t h e t o p a n d b o t t o m o f t h e H u m u s t a n k t o f o r m s l u d g e . T h i s s l u d g e r e m a i n s i n t h e t a n k , u n t i l t h e t a n k i s ‘ d e - s l u d g e d ’ . T h e f u l l y t r e a t e d l i q u i d d i s p l a c e d f r o m t h e h u m u s t a n k i s k n o w n a s F i n a l E f f l u e n t .
4 . 2 D I S I N F E C T I O N U l t r a v i o l e t t e c h n o l o g y i s t h e m o s t c o m m o n a n d p r e f e r r e d m e t h o d o f d i s i n f e c t i o n w h i c h i s c u r r e n t l y u s e d o n m o s t w a s t e w a t e r t r e a t m e n t p l a n t s . T h e p r o c e s s i n v o l v e s u s i n g a n u l t r a v i o l e t ( U V ) l a m p w h i c h t r a n s f e r s e l e c t r o m a g n e t i c e n e r g y f r o m a m e r c u r y a r c l a m p t o t h e o r g a n i s m ' s g e n e t i c m a t e r i a l ( D N A a n d R N A ) . W h e n U V r a d i a t i o n p e n e t r a t e s t h e c e l l w a l l o f a n o r g a n i s m , i t d e s t r o y s t h e c e l l ' s a b i l i t y t o r e p r o d u c e . U V r a d i a t i o n , g e n e r a t e d t h r o u g h a n e l e c t r i c a l d i s c h a r g e t h r o u g h m e r c u r y v a p o r , p e n e t r a t e s t h e g e n e t i c m a t e r i a l o f m i c r o o r g a n i s m s a n d r e t a r d s t h e i r a b i l i t y t o r e p r o d u c e . T h e e f f e c t i v e n e s s o f a U V d i s i n f e c t i o n s y s t e m d e p e n d s o n t h e c h a r a c t e r i s t i c s o f t h e w a s t e w a t e r , t h e i n t e n s i t y o f U V r a d i a t i o n , t h e a m o u n t o f t i m e t h e m i c r o o r g a n i s m s a r e e x p o s e d t o t h e r a d i a t i o n , a n d t h e r e a c t o r c o n f i g u r a t i o n . F o r a n y o n e t r e a t m e n t p l a n t , d i s i n f e c t i o n s u c c e s s i s d i r e c t l y r e l a t e d t o t h e c o n c e n t r a t i o n o f c o l l o i d a l a n d p a r t i c u l a t e c o n s t i t u e n t s i n t h e w a s t e w a t e r . T h e m a i n c o m p o n e n t s o f a U V d i s i n f e c t i o n s y s t e m a r e m e r c u r y a r c l a m p s , a r e a c t o r , a n d b a l l a s t s . T h e s o u r c e o f U V r a d i a t i o n i s e i t h e r t h e l o w - p r e s s u r e o r m e d i u m - p r e s s u r e m e r c u r y a r c l a m p w i t h l o w o r h i g h i n t e n s i t i e s . E v e n t h o u g h t h i s e f f l u e n t i s s u i t a b l e f o r d i s c h a r g e t o a w a t e r c o u r s e , w e p r o p o s e a n a d d i t i o n a l t e r t i a r y t r e a t m e n t b y w a y o f a S A L C O R M O D E L 3 G U V W A S T E W A T E R D I S I N F E C T I O N U N I T . N o t o n l y w i l l t h i s u n i t a l l o w f o r d i s i n f e c t i o n f o r t o t a l i n a c t i v a t i o n / d e s t r u c t i o n o f a n y e x i s t i n g p a t h o g e n i c o r g a n i s m s t o f u r t h e r e n s u r e t h e p r e v e n t t h e s p r e a d o f w a t e r b o r n e d i s e a s e s t o d o w n s t r e a m u s e r s a n d t h e e n v i r o n m e n t , i t a l s o c a p a b l e o f F e a c a l C o l i f o r m r e d u c t i o n o f 9 9 . 9 % .
4 . 3 W W T P S E E D I N G T h e p r o p o s e d W W T P ( s ) w i l l r e q u i r e a s e e d i n g / s t a b i l i s a t i o n p e r i o d w h i c h w i l l a l l o w f o r t h e d e v e l o p m e n t o f a n a d e q u a t e p o p u l a t i o n o f m i c r o - o r g a n i s m s ( b a c t e r i a ) w i t h i n t h e W W T P t o m a k e t h e t r e a t m e n t s y s t e m o p e r a t e e f f i c i e n t l y . W e i n t e n d t o a c h i e v e t h i s b y i m p o r t i n g A c t i v a t e d S l u d g e f r o m o n e o f o u r f u n c t i o n i n g S e p t i c T a n k s , t o i n i t i a t e t h e p r o c e s s . B a s e d o n i n t e n d e d p o p u l a t i o n a n d u t i l i z a t i o n , w e p r o p o s e a S e e d i n g P e r i o d o f s i x ( 6 ) w e e k s . D u r i n g t h i s p e r i o d a l l F i n a l E f f l u e n t w i l l b e d i r e c t e d b y w a y o f a v a l v i n g s y s t e m t o O u t f a l l H o l d i n g T a n k s a s a m i t i g a t i n g m e a s u r e , t h e s e O u t f a l l F a l l t a n k s w i l l b e d e s l u d g e d u s i n g S e p t i c T r u c k s e v e r y o t h e r d a y o r w h e n r e q u i r e d d u r i n g t h e s e e d i n g p r o c e s s , t h i s e f f l u e n t w i l l b e t a k e n t o W A S A ’ s W a s t e w a t e r M a n a g e m e n t P l a n t s f o r p r o c e s s i n g .
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4 . 4 S E P T I C T A N K S Y S T E M ( S T S ) A S e p t i c T a n k S y s t e m w i l l c o n s i s t o f a S e p t i c T a n k , S o a k a w a y P i t a n d t h e s u r r o u n d i n g s o i l i n t o w h i c h w a s t e w a t e r i s f i n a l l y d i s p o s e d .
4 . 4 . 1 S e p t i c T a n k A D o u b l e C o m p a r t m e n t S e p t i c T a n k w i t h a c a p a c i t y 2 1 7 5 l i t r e s w i l l b e u s e d i n t h i s a p p l i c a t i o n i n o r d e r t o m a n a g e b o t h B l a c k a n d G r a y W a s t e w a t e r . T h e a n t i c i p a t e d d a i l y W a s t e w a t e r D i s c h a r g e f r o m t h e M i n i M a r t / F o o d C o u r t i s 1 0 6 0 l i t r e s ; t h e r e f o r e t h e p r o p o s e d S e p t i c T a n k w i l l b e l a r g e e n o u g h t o h o l d t h e v o l u m e o f w a s t e w a t e r c o l l e c t e d i n t w o ( 2 ) d a y s . T o e n s u r e o p t i m u m o p e r a t i o n a n d f u n c t i o n a l i t y o f t h e S e p t i c T a n k , w e w i l l i n s t i t u t e a d e s l u d g i n g f r e q u e n c y o f 1 8 0 d a y s
Figure 2 - Double Compartment Septic Tank
4 . 4 . 2 S o a k a w a y P i t
A S o a k a w a y i s a s i m p l e s t o n e f i l l e d p i t w h e r e t h e e f f i c i e n c y d e p e n d s o n t h e p o r o s i t y o f t h e g r o u n d . A p e r c o l a t i o n t e s t w a s c a r r i e d o u t a t f o u r ( 4 ) l o c a t i o n s o n t h i s s i t e , t h e s e t e s t r e v e a l e d t h a t i t t a k e s a p p r o x i m a t e l y 3 m i n u t e s f o r W a t e r L e v e l t o f a l l 2 5 m m w h i c h p r o v e s t h a t t h e R a t e o f P e r c o l a t i o n i s e x c e l l e n t . T h e e f f l u e n t f r o m t h e s e p t i c t a n k w i l l b e a b l e t o s o a k a w a y i n t o t h e s u r r o u n d i n g s o i l v i a t h e s i d e w a l l s o f t h e p i t . A s t h e e f f l u e n t s e e p s t h r o u g h t h e s u r r o u n d i n g s o i l , a p r o c e s s o f n a t u r a l p u r i f i c a t i o n o c c u r s . T h i s p r o c e s s i n c l u d e s t h e b r e a k d o w n o f t h e p o l l u t i n g m a t e r i a l b y b a c t e r i a o c c u r r i n g n a t u r a l l y i n t h e s o i l , a n d t h e e v e n t u a l “ d i e o f f ” o f t h e p a t h o g e n s .
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T a b l e 5 s h o w s D e s i g n J u s t i f i c a t i o n f o r S T S c o m p o n e n t s
CALCULATIONS FOR SEPTIC TANK SYSTEM
Mini Mart/Food Court
Daily Wastewater Flow 1060 Litres
Septic Tank
Note: Minimum Double Compartment Septic Tank
Capacity 2.175 m3
Required Septic Tank Capacity 2175 Litres
Required Septic Tank Capacity 2.2 m3
Proposed Septic Tank dimensions
Total Length 2.25 M
Width 1.25 M
Liquid Depth 1.5 M
Proposed Septic Tank Capacity 4.22 m3
Proposed > Required 91%
Soakaway Pit
Percolation Rate
Time for Water Level to fall 25mm 3 minutes
Required Absorption Area 0.027 m3/m2/d
Total Daily Wastewater Flow 1060 Litres
Total Daily Wastewater Flow 1.06 m3
Required Absorption Area 40 m2
Proposed Soakaway Dimensions
Length of Side Wall 4.5 M
Depth of Side Wall 2.25 M
Number of Walls 4 no.
Proposed Soakaway Dimensions 40.5 m2
Proposed > Required 1%
Table 5
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4 . 5 L A U N D R Y A p r o p o s e d L a u n d r y w i l l b e s e t u p a t t h e H o s t e l ; t h e d i s c h a r g e s f r o m t h e W a s h i n g M a c h i n e s w i l l b e m a n a g e d b y t h e C o n d e r W W T P . I n o r d e r n o t t o c o m p r o m i s e t h e b a c t e r i o l o g i c a l p r o c e s s e s , e c o - f r i e n d l y N a t u r a l L a u n d r y D e t e r g e n t s w i l l b e u s e d , T h e c o m p o s i t i o n s o f t h e s e d e t e r g e n t s a r e :
i . t h e y h a v e n o o p t i c a l b r i g h t e n e r s i i . n o d y e s o r f r a g r a n c e s i i i . n o p h o s p h a t e s
T h i s e c o - f r i e n d l y N a t u r a l L a u n d r y D e t e r g e n t s i s m a n u f a c t u r e d u s i n g l o w -f o a m i n g b l e n d o f n a t u r a l l y d e r i v e d c l e a n i n g a g e n t s ( c o c o n u t - d e r i v e d s u r f a c t a n t s , g l y c e r i n ) , n a t u r a l w a t e r s o f t e n e r s , a l k a l i n i t y b u i l d e r s , a n t i -r e d e p o s i t i o n a g e n t s ( s o d i u m c i t r a t e , b o r a x ) , n o n - a n i m a l d e r i v e d e n z y m e s t o r e m o v e p r o t e i n a n d s t a r c h s t a i n s a n d p r o t e c t f a b r i c s , p l a n t d e r i v e d a n t i -f o a m i n g a g e n t s ( g l y c e r o l m o n o o l e a t e , o l e i c a c i d ) , c l e a n i n g e n h a n c e r ( c a l c i u m c h l o r i d e ) , p r e s e r v a t i v e ( l e s s t h a n 0 . 0 5 p e r c e n t ) , w a t e r , t h e s e i n g r e d i e n t s w i l l n o t c o m p r o m i s e t h e o p e r a t i o n o f t h e W W T P o r t h e s u r r o u n d i n g e n v i r o n m e n t . 5 . 0 K I T C H E N S I N K T h e w a s t e w a t e r g e n e r a t e d f r o m t h e p r o p o s e d d o u b l e c o m p a r t m e n t K i t c h e n S i n k l o c a t e d i n t h e M i n i M a r t / F o o d C o u r t , w i l l b e d i s p o s e d o f v i a a G r e a s e T r a p , t h e n i n t o t h e r e c e i v i n g S t o r m D r a i n s y s t e m .
Figure 3 - Kitchen Sink to Grease Trap Process Flow diagram
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5 . 1 G r e a s e T r a p T h e G r e a s e t r a p w i l l i n t e r c e p t a p p r o x i m a t e l y 9 5 % o f F . O . G s ( F a t s , O i l s a n d g r e a s e s ) f r o m K i t c h e n S i n k e f f l u e n t . T h e i n t e r c e p t e d F O G s s o l i d i f y w h e n c o o l e d a n d t a k e t h e f o r m o f a f l o a t i n g s c u m l a y e r ; t h i s c o a g u l a t i o n p r o c e s s i s e x p e d i t e d w i t h t h e i n t r o d u c t i o n o f c o l d c o n d e n s a t e w a t e r .
G R E A S E T R A P C A L C U L A T I O N S
D i m e n s i o n o f D o u b l e C o m p a r t m e n t K i t c h e n S i n k
L e n g t h 1 6
i n s
W i d t h 1 2
i n s
D e p t h 1 8
i n s
C a p a c i t y o f D o u b l e C o m p a r t m e n t K i t c h e n S i n k
3 4 5 6 i n s 3
A m t o f c o m p a r t m e n t s i n K i t c h e n S i n k
2 o n l y
C a p a c i t y o f K i t c h e n S i n k
6 9 1 2 i n s 3
1 G a l l o n P e r M i n u t e
2 3 1 i n s 3
F l o w R a t e f r o m K i t c h e n S i n k
2 9 . 9 G P M
A d j u s t f o r d i s p l a c e m e n t b y c o n t e n t s 0 . 7 5
K i t c h e n S i n k d i s c h a r g e r a t e
2 2 . 4 G P M
C o n d e n s a t e L i n e s d i s c h a r g e r a t e 2 G P M
M a x i m u m F l o w R a t e t o b e r e c e i v e d b y p r o p o s e d G r e a s e T r a p
2 5 G P M
P r o p o s e d G r e a s e T r a p C a p a c i t y 5 0 l b s .
Table 6
Figure 4 - 50lb capacity Grease Trap
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PLANT LOADING PROFILE Influent Loadings
Application No. Flow
[l/day]
Total Flow
[l/day]
BOD [g/day]
Total BOD
[g/day]
NH4-N [g/day]
Total NH4-N [g/day]
Day Staff 10 10 100 38 380 5 50
Hostel Guest 50 50 2500 50 2500 13 650
We have used the above information to determine the influent conditions as summarised below. Please note, that the influent conditions are our best estimate for this application and that it remains the responsibility of W.O.M to specify actual influent conditions in both quantity and characteristics.
Total Daily Flow 2600 (l/day)
Peak Flow 0.09 (l/sec)
Total Influent Organic Load (BOD5) 2880 (gBOD5/day)
Total Influent Ammoniacal Nitrogen 700 (gNH3/4/day)
Concentration of Influent BOD5 362 (mg/l)
Concentration of Influent Ammoniacal Nitrogen 41.5 (mg/l)
Discharge Consent This Clereflo system is designed to meet and surpass The Water Pollution Rules (Second Schedule)
BOD5 20 mg/l
Suspended Solids 30 mg/l
Ammoniacal Nitrogen NH3\4 10 mg/l
Nitrification For effective ammoniacal nitrogen treatment it is assumed that the incoming water supply has a high level of total alkalinity (as calcium carbonate), which is at least a minimum of 7.1 times that of the ammoniacal nitrogen to be removed plus a margin. The waste water will have a minimum carbonate content of: 295 mg/l
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Desludging Maximum interval between de-sludging of Primary Tank: 90 Days (at full plant loading) We have offered standard Conder Products equipment and have not included for any client specific specifications. If these become available we reserve the right to adjust our proposal accordingly
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WATER POLLUTION RULES
SECOND SCHEDULE (Rule 8)
PERMISSIBLE LEVELS
Water Pollutants Receiving Environment
No. Parameters or Substances Inland
Surface Water
Coastal Nearshore
Marine Offshore
Environmentally Sensitive Areas
and/or Groundwater
Levels or Conditions
1 Temperature 35 40 45 NIAA 2 Dissolved Oxygen <4 <4 <4 <4 3 Hydrogenion (pH) 6 - 9 6 - 9 6 - 9 6 - 9
4 Five day Biological Oxygen Demand (BOD5 at 20°C)
30 50 100 10
5 Chemical Oxygen Demand (COD) 250 250 250 60 6 Total Suspended Solids (TSS) 50 150 200 15
7 Total Oil and Grease (TO&G) or n-Hexane Extractable\Material (HEM)
10 15 100 No release
8 Ammoniacal Nitrogen (NH3-N) 10 10 10 0.1
9 Total Phosphorus (P) 5 5 5 0.1
10 Sulphide (H2S) 1 1 1 0.2
11 Chloride (Cl-) 250 NIAA NIAA NIAA
12 Total Residual Chlorine (Cl2) 1 1 2 0.2
13 Dissolved Hexavalent Chromium (Cr6+
) 0.1 0.1 0.1 0.01
14 Total Chromium (Cr) 0.5 0.5 0.5 0.1 15 Dissolved Iron (Fe) 3.5 3.5 3.5 1 16 Total Petroleum Hydrocarbons (TPH) 25 40 80 No release 17 Total Nickel (Ni) 0.5 0.5 0.5 0.5 18 Total Copper (Cu) 0.5 0.5 0.5 0.01 19 Total Zinc (Zn) 2 2 2 0.1 20 Total Arsenic (As) 0.1 0.1 0.1 0.01 21 Total Cadmium (Cd) 0.1 0.1 0.1 0.01 22 Total Mercury (Hg) 0.01 0.01 0.01 0.005 23 Total Lead (Pb) 0.1 0.1 0.1 0.05
24 Total Cyanide (CN-) 0.1 0.1 0.1 0.01
25 Phenolic Compounds (phenol) 0.5 0.5 0.5 0.1 26 Radioactivity NIAA NIAA NIAA NIAA
Levels or Conditions
27 Toxicity NATE NATE NATE NATE 28 Faecal Coliforms 400 400 400 100 29 Solid Waste NSD NSD NSD NSD
a
all units are in milligrams per litre (mg/L) except for temperature (°C), pH (pH units), faecal coliforms (counts per 100 ml), radioactivity (Bq/L) and toxicity (toxic units) NIAA - no increase above ambient NATE - no acute toxic effects
NSD - No solid debris
<– less than
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SPECIFICATIONS FOR THE SALCOR MODEL 3G UV WASTEWATER DISINFECTION UNIT
1.0 DESCRIPTION
The Salcor 3G disinfection chamber couples directly to the aerobic plant discharge pipe and is permanently installed below grade. The design details of the Salcor 3G unit are shown in section 4.0.
The ultraviolet light source for disinfection is mounted in a sub-assembly which can be inserted or removed through the top of the riser pipe for periodic servicing. The light source is mounted in the center of an anodized aluminum frame which divides the disinfection chamber in half. The frame seals against the inner surface of the disinfection chamber to prevent flow bypass.
When fully inserted, the disinfection sub-assembly is properly located by two pins mounted near the top of the disinfection chamber. The disinfection subassembly causes the wastewater entering one side of the unit to flow vertically downward, make a 180 degree turn, and then flow vertically upward and out the other side of the unit. This well-defined flow path is designed to give the fluid proper exposure time and no short circuiting. The ultraviolet light source is surrounded by a clear fused quartz tube to control the lamp surface temperature. A clear TeflonTM film covers the quartz tube to minimize surface fouling. This design feature incorporates the beneficial attributes of both quartz and TeflonTM. When the disinfection chamber is filled with water, the ultraviolet light source can operate continuously, whether or not water is flowing. Continuous operation with a lamp surface temperature range of between 105 and 120 degrees Fahrenheit provides optimum ultraviolet light output and long lamp life.
The Salcor Model 3G alarm relay circuit triggers an external alarm to warn the user when the UV lamp is not operating properly. Electronic components in the circuit sense changes in the UV lamp operation which correlate with the germicidal ultraviolet output. The normally energized relay has contacts that allow actuation of an external alarm indicating low UV output or lamp outage.
The alarm relay circuit has been designed to be compatible with a wide variety of alarms used on upstream aerobic treatment plants, and is compatible with either 120 VAC or DC power.
The disinfection sub-assembly, which may extend approximately one foot above grade, is water tight throughout its length, which protects the electrical connections inside the junction box from any fluid backup. When the UV lamp is producing ultraviolet germicidal light at a safe level, a green LED indicator light, located on the outside of the electrical junction box, glows indicating proper UV lamp
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operation. The light stops glowing when the light output from the UV lamp falls below a safe level.
2.0 DESIGN PARAMETERS
2.1 Flow Rate. Maximum flow at 3 gpm (4320 gpd) for waste water effluents for suspended solids less than 30 mg/liter and BODs less than 30 mg/liter. Maximum flow rate of 6 gpm (8640 gpd) for waste water effluents of suspended solids less than 10 mg/liter and BODs less than 10 mg/liter.
2.2 Fecal coliform reduction at lamp end-of –life (2 years) greater than 99.9 percent. 2.3 Inlet and outlet pipe is 4 inch schedule 40 ABS. 2.4 Pressure drop is less than 0.5 inches of water at maximum flow rate. 2.5 Power use is 30 Watts. 2.6 Energy use is 0.72 kW-hr/day. 2.7 UV lamp is low pressure mercury, 90 percent of output at 253.7 nanometers. Minimum
arc length is 30 inches, and the UV intensity is greater than 190 microwatts/cm2 at one meter. The lamp life is greater than two years.
2.8 UV dose is greater than 55 mj/cm (55,000 microwatt-seconds/cm2). 2.9 UV Lamp Ballast. Ninety Percent efficient, high frequency (50 kilohertz) with thermal link
protection. Input Voltage, 120 VAC, 50 or 60 Hz. Input current, up to 0.5 amps.
3.0 THIRD PARTY TESTING 3.1 University of Rhode Island. George Loomis 1999 - 2005
FAST Unit effluent
Annual Service
Lamp replacement every two years
Geometric mean fecal coliform count 9.4/100 ml 3.2 Washington State Testing
Advanced Treatment Unit & UV
NSF Standard 40 & WA State Fecal Coliform Reduction Protocol
Duration 26 weeks
Seventeen tests have been completed.
3G UV Effluent Fecal Coliform ranged from 2 – 35 per 100 ml (Geometric Mean)
Demonstrates that the 3 G UV unit operates reliably without maintenance over 6 months
3.3 Manufacturers Who Have Tested With the Salcor 3G Unit Using the Washington State Protocol
Consolidated Treatment, Enviroguard .75.
Consolidated Treatment, Multiflo.
Consolidated Treatment, Nyadic.
Delta Whitewater, DF 60.
Delta Whitewater, Ecopod.
Aero Tech.
Clearstream.
Aqua Klear.
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