wom wastewater management project

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W ATER S ERVICES AND S YSTEMS M ANAGEMENT 180 Riverside Avenue, Mount Hope, Trinidad Telefax: 1.868.638.2548 - Mobile: 1.868.319.0214 - e-mail: [email protected] WASTEWATER MANAGEMENT PROPOSAL PROJECT: WORLD OUTREACH CHURCH MINISTRIES 17 MORNE COCO ROAD, PETIT VALLEY - TRINIDAD Prepared and Calculated by JEFFREY A. JAMES Dip Pl Cr, Dip Env. Mgmt. MTPATT October 2013

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Page 1: WOM Wastewater Management project

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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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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