environmentclearance.nic.inenvironmentclearance.nic.in/writereaddata/formb/ec/additional...(mbbr)...

TECHNICAL WRITE UP – STP 85 KLD & UF 85 KLD COVER PAGE

TECHNICAL WRITE UP

FOR

THE CAPACITY OF

SEWAGE TREATMENT PLANT – 85 KLD

WITH MBBR TECHNOLOGY

&

ULTRA FILTRATION SYSTEM – 85 KLD

CLIENT: M/S COTTON CITY DEVEOPERS PVT LIMITED, NO 1029, AVINASHI ROAD, OPPOSITE PRS,

ANNA STATUE, RACE COURSE, GOPALAPURAM,

COIMBATORE — 641 018.

SUBMITTED

BY

M/S. AQUA ECO GREEN TECHNOLOGY PVT LTD., GF - 2, SRI VARAHA APARTMENT,

NO.18A, GANGAIAMMAN KOIL STREET, JAFFERKHANPET, CHENNAI – 600 083.

TECHNICAL WRITE UP – STP 85 KLD & UF 85 KLD Page 1

PROPOSED STP – 85 KLD & UF – 85 KLD

Design Parameters:

The treatment plant is designed for the following basic data:

Sl.No. Items Raw Sewage Treated

Sewage with UF

Treated Sewage

Tolerance limit as per CPCB

01. pH 5.5 – 9.0 5.5 – 9.0 5.5 – 9.0

02. B.O.D. 250 - 350 mg/l <10 mg/l <10 mg/l

03. C.O.D. 400 - 600 mg/l <50 mg/l <50 mg/l

04. T.S.S.

200 - 300 mg/l <20 mg/l <20 mg/l

05. Oil & Grease 10 - 20 mg/l < 10 mg/l < 10 mg/l

Flow Rate Data:

Sewage Generation - 85 m3/day Design Capacity - 85 m3/day Operation Hours - 24 hrs. Average Flow Rate - 3.55 m3/hr (OR) Cum per hr

Codes & Standards:

All design, fabrication, inspection, and testing of the plant will be done with respect to the latest Indian Standards. In case of non-availability of standards, good engineering practice will be adopted.

Standards to be followed:

Plain & reinforced cement concrete - IS456:2000 Concrete structure for the storage of liquids - IS 3370: 1981-88 Pressure vessels - ASME SEC VIII Pumps - IS 5120 Others - Available IS standards.

In case of non-availability of standards, good engineering practice will be adopted.


TREATMENT METHODOLOGY

PRINCIPLE

The Sewage Treatment Plant is designed based on Moving Bed Bio Reactor

(MBBR) Process. The sewage treatment process involves the following unit

operations / treatment units as given below.

� Bar Screen Chamber

� Equalization Tank

� MBBR – Aeration Tank - I

� MBBR – Aeration Tank - II

� Secondary Settling Tank

� Clarifier Water Tank

� Filtration through Pressure Sand Filter and Carbon Filter

� Disinfection by chlorination

� Disinfection by UV sterilizer

� Ultra filtration feed tank

� Ultra filtration system

� Ultra filtration treated water tank

� Sludge Holding Tank

� Screw pump

� Filter Press


Bar Screen Chamber

Equalization Tank

Settling Tank

Clarifier Water Tank

UF Feed Tank

Sludge Holding Tank

Filter Press

Hypo Dosing & UV Disinfection

UF System

Aeration Tank (MBBR) – I & II

UF Treated Water Tank

To Toilet Flushing & Gardening

P

P

P

P

Raw Sewage

Dried Sludge for disposal

85KL/Day

Air Supply

Air Blower

Air Supply Filtrate

Activated Carbon Filter

Pressure Sand Filter

85 KL/Day

Air Supply

A A


TREATEMENT SCHEME

PRE TREATMENT SYSTEM – SCREENING

Trash and non-biodegradable solids, such as hair, lint, girt and plastics may foul

or damage the membranes, pumps if allowed to pass into the treatment. To

enhance the long-term operation and effectiveness of the treatment system AE

recommends an internally fed channel screens with 10mm opening with no

possibility of bypass or carryover.

COLLECTION / FLOW EQUALIZATION TANK

The Waste water then flows by gravity into the Collection/Equalization Tank

which is provided with submerged aeration system generally to keep the solids in

suspension and homogeneous conditions and not to allow anaerobic/septic

conditions to set in. Equalization tank shall take care of flow surges and

homogenization. Equalization of sewage is essential to make a uniform mixture

for further treatment. Raw Sewage Transfer Pump operates with help of level

switches.

AERATION TANK - MBBR TANK I & II

From the equalization tank, waste water is constantly pumped into the Moving

Bed Bio Reactor (Aeration tank) where sufficient amount of air is supplied to

oxidize the organics absorbed by the bacterial biomass. Required quantity of air

is supplied and mixing is done by the Diffused Aeration System. The Moving

Bed Bio Reactor is fitted with air diffusers for supply of air and is filled with plastic

media in a fluidized form for providing adequate surface area for bacteria to

oxidize the organics present in the waste.


Aeration tank is the main Reaction tank for the biological process. As the waste

water flows into the tank an equal quantity of the tank contents overflows in to

clarifier / setting tank. Aeration tank is provided with diffused aeration / mixing

system, where in tubular membrane diffuser is provided and are arranged at the

bottom of the tank and air is fed with air blowers provided for aeration operate

continuously round the clock, so long as there is normal waste water flow in to

the tank.

DETAILS OF PLASTIC MEDIA:

PLASTIC MEDIA:

Random packed PP / Plastic media has wide application in biological treatment

systems. The media provides optimum effective surface area for biological

growth. The three dimensional liquid distribution due to unique dimensional

design increases hydraulic Retention time and ensures excellent gas – liquid

distribution within the packed bed reactor, thus enhancing the treatment

efficiency.

When installed in random configuration, it maintains uniform passage of air and

waste water in all direction throughout a 360 deg field. The orientation is such

that no surface generates a continuous vertical or horizontal position.

Material specifications: Constructed from PP / Plastic which is a strong, light

weight and chemically resistant material, also non-toxic to micro organisms. The

formulation adopted is resistant to UV degradation, aging and erosion.

The waste water in the aeration tank utilize the oxygen fed through air blowers and

the micro organism (Bio-Mass) starts growing with attached on top of Plastic Media

using the nutrients present in waste water. The contents of the aeration tank are

called “Mixed liquor and suspended solids as Mixed liquor suspended solids”

(MLSS), which is in fact the active Bio–mass responsible for bio-degradation of the

effluent. The Bio-mass comprises chiefly of bacteria and to some extent lower form

animals such as rotifers and protozoa.


SECONDARY SETTLING TANK:

The overflow from aeration tank is led into the secondary Settling tank by gravity.

The sludge get settles at the bottom of the tank and is directed towards the

sludge well at the center. The sludge collected at the center is pumped to

aeration tank or to Sludge Holding tank by Return sludge Pumps.

Treated Sewage water from secondary settling Tank as overflow shall be lead to

Clarifier water tank.

TERTIARY TREATMENT:

The clear water overflowing from the secondary Settling Tank is collected in a

tank called clarifier water tank. This water is generally have desired

characteristics required for water to be used on irrigation land with 92-95% of

BOD5 removed.

However for reuse and reclamation of treated water for landscaping, gardening,

A/c- make up and toilet flushing, the tertiary treatment is carried out with the

following units, for further reduction in TSS, BOD5, odour and colour.

PRESSURE SAND FILTER (PSF):

The treated water from the sump is pumped to pressure sand filter. This is a

pressure vessel equipped with a perforated under drain plated, filled with filter

media comprising of graded gravel / sand. The suspended particulars are

arrested and the clean filtered water coming out from pressure sand filter is led to

ACF filter for further treatment.


1. The bottom portion of the filter is filled with three layers of pebbles of different

sizes.

a. 1 ½” x 1”

b. 3/4” x 1/2”

c. 1/2” x 3/8”

2. The middle portion of the filter is filled with two types of silex.

a. Coarse silex of size 3/8”x1/4”

b. Fine silex of size 1/4”x1/10”

3. The top portion of the filter is filled with 16/32” filter sand.

The purpose of sand filter is mainly to remove the colloidal impurities/suspended

solids .which is present in the biological treated sewage effluent. The filter back

wash has to be carried out based on the differential pressure between the inlet

and the outlet of the pressure sand filter.

ACTIVATED CARBON FILTER:

The filter water from the PSF passes through the activated carbon filter, which is

again a vertical pressure vessel equipped with perforated plate at the bottom and

bell mouth at the top. In between is the filter media comprising of 500 – 600 mm

activated carbon granules over a bed of graded gravel.

In ACF any odour and to certain extent color in the wastewater is absorbed by

the carbon and the filter water is absolutely sparklingly clear.

1. The bottom portion of the filter is filled with three layers of pebbles of

different sizes.

a. 1 ½” x 1”

b. 3/4” x 1/2”

c. 1/2” x 3/8”

2. The middle portion of the filter is filled with two types of silex.

a. Coarse silex of size 3/8”x1/4”

b. Fine silex of size 1/4”x1/10”

3. The top portion of the filter is filled with Activated carbon.


The purpose of carbon filter is mainly to remove the colloidal trace organics

/neutralized the hypo to maintain residual chlorine which is present in the

biological treated sewage effluent. The filter back wash has to be carried out

based on the differential pressure between the inlet and the outlet of the pressure

carbon filter.

ULTRA VIOLET:

An on line Ultra Violet is provided at the outlet of the ACF, on switching it on it

automatically, this UV System acts as a disinfectant in the filter water and thus

ensuring filtered water is harmless for skin of the persons who come in contact

with it.

CHLORINATION:

A on line chlorinator is provided at the outlet of the ACF, on switching it on it

automatically injects the hypochlorite solution into the filter water coming out of

ACF at desired rate, this hypochlorite solution acts as a disinfectant in the filter

water, Controls Organic matter and thus ensuring filtered water is harmless for

skin of the persons who come in contact with it.

ULTRAFILTRATION:

Ultra filtration or UF is a pressure driven membrane separation process that

separates particulate matter from soluble components in the carrier fluid (such as

water). UF membranes typically have pore sizes in the range of 0.01 - 0.10 µm

and have a high removal capability for bacteria and most viruses, colloids and silt

(SDI).

From the Treated Water tank the water will be pumped to Ultra filtration Plant.

This is designed by using advanced technology with the purpose of removing

micro bacterial counts. Ultra filtration system is also used as a pre treatment to

the reverse osmosis plants. The Ultra filtration work on Dead end flow filtration

principle and designed operates at around 90% recoveries.


The Filtered / Treated water from sewage treatment plant is then passed through

the latest state of the art ultra filtration membranes for the reduction of SDI,

colloidal particles and then bacteriological contamination. The UF membranes

selected are the unique Multi bore Membranes which has the highest mechanical

strength than the single bore membranes. UF membranes are designed with a

flux of 40 - 50 LMH and the membranes are operated in Dead End mode or

Cross Flow. The backwash and the forward flush are let into the inlet of STP

plant for further treatment. The unit is automatic operated through a PLC. This

unit consists of inside cleaning system namely the Caustic and HCl chemicals.

Treated water from the Ultra filtration System shall be stored in UF Permeate

Storage Tank and UF Membranes shall be backwashed frequently.

SLUDGE RECIRCULATION & EXCESS SLUDGE DISPOSAL:

Sludge recirculation system for re circulating settled activated sludge from

secondary settling back to aeration tank and comprising either direct pumping

from secondary settling or pumping from a separate sludge sump into which the

clarifier sludge drains.

The excess sludge generated is collected in a separate tank called aerobic

digester / Sludge Holding tank where in the sludge is further digested &

thickened. The thickened sludge is either put on to sludge drying beds or taken

out as cakes through a Filter press. Such dried sludge is good manure for Plant

and trees.

TREATED WATER TANK:

After UF Treatment, the treated and filtered water is collected in this sump until

used for further disposal for landscaping / gardening and toilet flushing or other

re-use.

5000 1900 2000

EQT

2300

SHT

CWT UFFT

17900

17300

AT - I

A'

P3

P4

BSC BAR SCREEN CHAMBER

MARKS DESCRIPTION

EQT EQUALIZATION TANK

AERATION TANK - I AT-I

SSTSECONDARY SETTLING TANK

CLARIFIER WATER TANKCWT

SLUDGE HOLDING TANKSHT

L X W X HT

QTY MOC

1

1

1

1

1

1

1

RCC

RCC

RCC

RCC

RCC

RCC

RCC

S.NO

1

2

3

4

5

6

7 UFFTUF FEED TANK

0.78

42.00

17.76

15.45

23.56

8.51

29.60

SIZE IN METERS

SIZE LVL QTY

1

AIR VENT

LOCATION

100 NB

1

MARKS DESCRIPTION

A1

A4

A5

AIR VENT

1

TOT100 NB

A2

AIR VENT 100 NB

1A6 AIR VENT

1

100 NB

AIR VENT 100 NB 1

AT - I

SHT

EQT

UFFT

CWT

AIR VENT 100 NB 1

A3

SST

TOT

TOT

TOT

TOT

TOT

NOTES :-

1. ALL DIMENSIONS ARE IN MM.

2. ALL LEVELS ARE IN METERS.

3. ALL DIMENSIONS ARE CONSIDERED AS INNER CLEAR.

4. TOP & BOTTOM SLABS, WALL THICKNESS TO BE AS PER

CLIENT STRUCTURAL DESIGN.

5. F.G.L LEVEL CONSIDER ±0.00M

LAYOUT DRAWING FOR 85 KLD

(DETAIL - MANHOLE / PUDDLE PIPE / AIRVENT)

RCC WALL

BRICK WALL

MANHOLE

CUTOUT

AIR VENT PIPE

PUDDLE SLEEVE

1200 1200

AT - II

AERATION TANK - IIAT-II

3 17.761

RCC

2500

UFTWT

4600

BSC

RAW SEWAGE

INLET PIPE

600

A

P1

1000

4000

MH MH

MH MH

MH

MHMH

MH

A1 A4

MH

MH

MH

MH

A6

MH

A2 A3 A7 A8

1 RCC8

UFTWTUF TREATED WATER TANK 37.00

LIST OF MECHANICAL UNITS :- STP

2

3

4

5

6

7

8

9

11

RSTP

AB AIR BLOWER

RETURN SLUDGE PUMP RSP

MARKSDESCRIPTION

PRESSURE SAND FILTERPSF

ACTIVATED CARBON FILTERACF

CHLORINE DOSING SYSTEMCL

2

FILTER FEED PUMP FFP

BS BAR SCREEN

S.NO

2

3

4

5

6

7

8

UFFP

10

UF FEED PUMP

ULTRA FILTRATION SYSTEMUF

9

HCL DOSING PUMP HCL

14

CAUSTIC DOSING PUMP CAU

13

12

UF BACKWASH PUMPUFBP

11

15

16

QTY

1

2

2

2

2

1

1

1

2

1

1

1

2

11

FPFILTER PRESS

SCREW PUMPSP

1

1

ULTRA VIOLET STERLIZERUV 1

0.60 X 1.00 X 1.30M

1AIR VENT 100 NB

A7

1UFTWTTOT

1AIR VENT 100 NB

A8

1AT - IITOT

P2

ENTRANCE

PLANT :-

PROJECT :-

CLIENT :-

WORK ORDER NO.

N.T.S.

DESIGN

GF-2, Sri varaha appartment, No-18A,Gangaiamman koil street, Jafferkhanpet,

Chennai - 600 083. Landline : 044-24711580

Email:[email protected]. URL :www.aquaecogreen.com.

TITLE :-

PROJECTIONSCALE

DRAWN

APPROVED

CHECKED

SHEET

REV. NO.

DWG NO.

AQUA ECO GREEN TECHNOLOGY PVT. LTD.REV.NO. DATE DETAILS OF REVISION DRAWN CHECKED APPROVED

JEON

-

0

LAYOUT DRAWING

VISWA

VISWA

06.07.17VISWA

STP - 85 KLD & UF - 85 KLD

06.07.17

06.07.17

06.07.17

"MANCHESTER @ VELLAKINAR VILLAGE

M/S COTTON CITY DEVELOPERS PVT.LTD.,

01 OF 04

1000

SST

A5

MH

SIZE LVL QTY

1

AIR VENT

LOCATION

100 NB

1

MARKS DESCRIPTION

A1

A4

A5

AIR VENT

1

TOT100 NB

A2

AIR VENT 100 NB

1A6 AIR VENT

1

100 NB

AIR VENT 100 NB 1

AT - I

SHT

EQT

UFFT

CWT

AIR VENT 100 NB 1

A3

SST

TOT

TOT

TOT

TOT

TOT

NOTES :-







LAYOUT DRAWING FOR 85 KLD

(DETAIL - PUMP ROOM)

RCC WALL

BRICK WALL

MANHOLE

CUTOUT

AIR VENT PIPE

PUDDLE SLEEVE

1AIR VENT 100 NB

A7

1UFTWTTOT

1AIR VENT 100 NB

A8

1AT - IITOT

PLANT :-

PROJECT :-

CLIENT :-

WORK ORDER NO.

N.T.S.

DESIGN




TITLE :-

PROJECTIONSCALE

DRAWN

APPROVED

CHECKED

SHEET

REV. NO.

DWG NO.


JEON

-

0

LAYOUT WITH PUMP ROOM DRAWING

VISWA

VISWA

06.07.17VISWA


06.07.17

06.07.17

06.07.17

02 OF 04

RSTP

AB

SP

FP

FFP

PSF ACF

UF

CAU

HCL

PANEL

UV

B'

B

1900 2000

EQT

2300

SHT

CWT UFFT

17900

17300

AT - I

A'

P3

P4

1200 1200

AT - II

2500

UFTWT

4600

BSC

RAW SEWAGE

INLET PIPE

600

A

P1

1000

4000

MH MH

MH MH

MH

MHMH

MHMH

MH

MH

MHMH

P2

ENTRANCE

SST

MH

UFFP

UFBP

RSP

CL2

DOWN

WINDOW WINDOW

WINDOW WINDOW

WINDOW

WINDOW


MARKS DESCRIPTION






L X W X HT

QTY MOC

1

1

1

1

1

1

1

RCC

RCC

RCC

RCC

RCC

RCC

RCC

S.NO

1

2

3

4

5

6

7 UFFTUF FEED TANK

0.78

42.00

17.76

15.45

23.56

8.51

29.60

SIZE IN METERS


3 17.761

RCC

1 RCC8



2

3

4

5

6

7

8

9

11

RSTP

AB AIR BLOWER


MARKSDESCRIPTION




2


BS BAR SCREEN

S.NO

2

3

4

5

6

7

8

UFFP

10

UF FEED PUMP


9

HCL DOSING PUMP HCL

14


13

12


11

15

16

QTY

1

2

2

2

2

1

1

1

2

1

1

1

2

11

FPFILTER PRESS

SCREW PUMPSP

1

1


0.60 X 1.00 X 1.30M



WL-1.15M

2400 S

WD

WL-0.15M

WL+0.45M

EQT

AT

-I

SST

CWT UFFT

5000 1200 1900 2000

17300

17900

1800

600

PCC

PCC

4000

2100 LD

1900 F

B

3700 S

WD

3100 LD

900

3700 LD

300

BSC

C1

P3

500

TUBE SETTLER MEDIA

RAW SEWAGE

INLET PIPE

P4

PUMP ROOM

LVL -3.25M

FFL 0.00M

LVL+4.00M

3000 C

LR

.H

T

1200

AT

-II

WL+0.45MWL+0.45M

SECTION DRAWING FOR 85 KLD

(DETAIL - SECTION - AA')

3700 S

WD

2500

WL+0.45M

3700 LD

300

2300

UFTWT

P1

P2

MH MH MH MH MH MH

WINDOWDOOR

NOTES :-







RCC WALL

BRICK WALL

MANHOLE

CUTOUT

AIR VENT PIPE

PUDDLE SLEEVE

PLANT :-

PROJECT :-

CLIENT :-

WORK ORDER NO.

N.T.S.

DESIGN




TITLE :-

PROJECTIONSCALE

DRAWN

APPROVED

CHECKED

SHEET

REV. NO.

DWG NO.


JEON

-

0

SECTION - AA'

VISWA

VISWA

06.07.17VISWA


06.07.17

06.07.17

06.07.17

03 OF 04

4500

LVL+1.00M


MARKS DESCRIPTION






L X W X HT

QTY MOC

1

1

1

1

1

1

1

RCC

RCC

RCC

RCC

RCC

RCC

RCC

S.NO

1

2

3

4

5

6

7 UFFTUF FEED TANK

0.78

42.00

17.76

15.45

23.56

8.51

29.60

SIZE IN METERS


3 17.761

RCC

1 RCC8



2

3

4

5

6

7

8

9

11

RSTP

AB AIR BLOWER


MARKSDESCRIPTION




2


BS BAR SCREEN

S.NO

2

3

4

5

6

7

8

UFFP

10

UF FEED PUMP


9

HCL DOSING PUMP HCL

14


13

12


11

15

16

QTY

1

2

2

2

2

1

1

1

2

1

1

1

2

11

FPFILTER PRESS

SCREW PUMPSP

1

1


0.60 X 1.00 X 1.30M

WINDOW



MH

TOTAL OSR AREA

3186.41 SQM

MAIN ENTRY

1

2

3

4

5

20

22

9

10

11

14

19

16

21

23

28

12

15

18

27

29

41

31

34

39

40

38

42

76

75

73

74

32

37

43

45

51

50

49

48

52

54

55

56

64

63

61

60

65

66

67

68

77

78

79

81

82

72

70

69

59

58

47

EBROOM

GENSETROOM

S.T.P

TRANS

FORMER

YARD

24

33

36

DRIVE WAY

SWIMMING POOL & CLUB HOUSE

46

57

Security Room

To Mettupalayam Road

To Vellakinar

13.91M WIDE EXISTING ROAD

47

SITE PLAN SHOWING THE GREENBELT DEVELOPMENT FOR THE PROPOSED RESIDENTIAL GROUP HOUSING BUILDINGS IN S.F. Nos.410 / 2E,

418 / 2, 419 / 1B, 419 / 1A2 & 420 / 3B AT VELLAKINAR VILLAGE,COIMBATORE NORTH TALUK & COIMBATORE CORPORATION.EL

ECTR

ICA

L TR

AN

SFO

RMER

RO

OM

W

.

M

.

P

6

7

30

25

RWH

23.61

Greenbelt around periphery - 1070.35 x 1.52 = 1626.93 sqm

LEGEND :

Greenbelt along Internal Road - 1160.58 x 1.21 = 1404.30 sqm

Greenbelt area provided around villas = 4942.09 sqm

Total Greenbelt Area = 8313.72 Sqm

Greenbelt area provided around E.W.S Block = 340.40 sqm

HT Line AREA

1315.16 SQM

Greenbelt Area provided under H.T. Line Area = 1315.16 Sqm

ANNEXURE II

RAINWATER HARVESTING

It is proposed to recharge the surface runoffs from the landscape areas and other lined &

unlined areas into the ground by recharging pits located all through the site. The storm water

from all these places will be collected by the storm water drains.

Rainwater Runoff Calculations

DescriptionArea in

SqmCoefficient

Runoff

RainfallIntensity in

m/hr

RainwaterRunoffCum/yr

Road Area 10314.26 0.85 0.5 4383.56

GreenbeltArea

4605.30 0.3 0.5 690.795

Roof Area 10306.51 0.9 0.5 4637.92

Total volume of rainwater runoff 9712.275

Considering Peak Rainfall 50 mm/hr,

Roof Run-off = (10306.51 x 0.9 x 0.050)

= 463.79 m3 will be collected in storage sump.

Runoff from Landscape area & road area will be used to recharge the ground water table.

Based on soil investigation report, number of percolation/ recharge pits will be calculated.

Excess runoff will be drained into the external storm water drain outside the site.

Recharge Pit – 12 Nos.

12 Nos of circular recharge pits are proposed to construct in the premises. Rain water falling

over the roads & pavement area and the open area will be used for recharging the ground

water. The diameter of pit is 2.0 m with 2.5 m depth and an additional freeboard of 0.5m. The

2.5 m pit is filled with 0.5 m of boulders, 0.5 m of 40 mm jelly stone, 0.5 m of 20 mm jelly

stone and 0.5 m of coarse sand and 20 mm jelly stone equally layered at the top. The rest of

the space is left free for rain water to percolate. 200 mm dia perforated PVC pipe is provided

upto the depth of sub soil level. The pit is covered with precast perforated slab and acts as

manhole. The cross section of the recharge pit is shown as below;

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