wom project wastewater management proposal

7/27/2019 WOM Project Wastewater Management proposal

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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 dTe lefax : 1 .868.638.2548 - Mobi le : 1 .868.319.0214 - e -mai l : wssml 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. JAMESDip Pl Cr, Dip Env. Mgmt. MTPATT

October 2013


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WSSM P L U M B I N G

WORLD OUTREACH CHURCH MINISTRIES

WASTEWATER MANAGEMENT PROPOSAL WSSM Ltd - 2013a

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 115.1 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

AppendicesPlant loading Profile i - ii

Composition of Domestic Wastewater iii

Water Pollution Rule iv

Specifications for UV Units v - viii


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WASTEWATER MANAGEMENT PROPOSAL WSSM Ltd

1

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 UIL DIN G C OMPL E X on 1 . 054 H ec t a res o f la 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 lo 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 eo 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 so S e c u r i t y

H o s t e lo H o s t e l A c c o m m o d at i o n

M i n i M a r t / F o o d C o u r to 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 dm 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

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 5I I . o n e ( 1 ) S e p t i c T a n k / S o a k a wa y

A c c o r d i n g t o WA SA s GUIDE L IN E FOR DE S IGN A N D C ON ST R UC T ION OF WA 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 Wa s t ew a t er F low [ 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 AMOUNTTYPICAL (LPD)

CONSUMPTION

TOTAL

CONSUMPTION

(LPD)

All Purpose Hall

Church Sanctuary/Cultural CentreSeat 300 15 4500

Employee 20 83 1660

Accommodation for visiting PastorsGuest 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

SupermarketPerson 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 CentreSeat 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


Septic

Tank/Soakaway

Pit

SupermarketPerson 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 ged s ew a ge

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 tP 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 bi 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 5w 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 S2 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 SubstancesInland Surface

Water

1 Temperature 35o C 27o CThis plant discharges liquid effluent at 3oC

above Ambient Temperature

2 Dissolved Oxygen Content (DO)


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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 CE 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 eb 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 te 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 ow 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 ON 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 od 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 po 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 dG 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 tA 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 te 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 no 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


Daily Wastewater Flow 1060 LitresSeptic Tank

Note: Minimum Double Compartment Septic Tank

Capacity2.175 m

3

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 MProposed Septic Tank Capacity 4.22 m

3

Proposed > Required 91%

Soakaway Pit

Percolation Rate

Time for Water Level to fall 25mm 3 minutes

Required Absorption Area 0.027 m3/m

2/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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11

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 si i . n o d y e s o r f r a g r a n c e si 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 mc 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
http://www.seventhgeneration.com/http://www.seventhgeneration.com/http://www.seventhgeneration.com/http://www.seventhgeneration.com/http://www.seventhgeneration.com/http://www.seventhgeneration.com/http://www.seventhgeneration.com/


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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 k3 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 ly

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 s3

1 G a l l o n P e r M i n u t e 2 3 1 i n s3

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 PM

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 PM

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 p2 5 G PM

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 bs .

Table 6

Figure 4 - 50lb capacity Grease Trap
http://en.wikipedia.org/wiki/Fathttp://en.wikipedia.org/wiki/Fat


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WASTEWATER MANAGEMENT PROPOSAL WSSM Ltda

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 proposalaccordingly


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WASTEWATER MANAGEMENT PROPOSAL WSSM Ltda

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/orGroundwater

Levels or Conditions

1 Temperature 35 40 45 NIAA

2 Dissolved Oxygen


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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 optimumultraviolet 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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iii

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 10mg/liter and BODs less than 10 mg/liter.

2.2 Fecal coliform reduction at lamp end-oflife (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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wom project wastewater management proposal

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