CHAITANYA KRISHNA

( MECHANICAL ENGINEER )

MEPL 2x150 MW

ABSTRACT

ABSTRACTThis paper of water treatment process in MEPL2 x 150 MW gives the over all idea on water

flow and treatment system. . Source of water is Kandaleru creek . Water from kandaleru creek is pumped with 2 pumps capacity 2500 m3/hr (2 x 2500 m3/hr). It reaches pretreatment

plant through 700 mm dia GRP pipe line .( Glass reinforced plastic ). Purpose of treatment is to obtain normal water parameters i.e to remove salinity in sea water ,and to obtain required

parameters for process .This will be achieved in five stages.1.pretreament. 2.Filteration 3. Sea water Reverse osmosis 4. Brackish water RO 5.DM Plant.Pretreatment : In pretreatment plant for Bactria killing ,Clarification. It includes chemical

dosing and klaritube settlers. This water from klaritubesettlers (2x 1260 m3/hr) fall into clarified water storage tank capacity (8000m3)

Filtration plant:274 m3 /hr) Filtration plant includes 4 filters 2 PSF (pressurized sand filters ) and 2 DMF

( Dual media filters) through filter feed pumps .SWRO:( 3 streams 96m3/hr each) Salinity in water can be removed in this process up to <30

parts per thousand .which is used service and potable water stored in three compartments of permeate tank ( total 4 compartments in permeate tank). Reject of system is given to sea.

BWRO : .(3 streams 54.87m3/hr each) Brackish water system is to maintain salinity <0.5. product of this is filled in 4th compartment of permeate tank, reject of this system is given to

CWST.DM plant : .(2 streams 30 m3/hr each) As per requirement of process with required parameters DM water is stored in DM tanks of capacity 300 m3 capacity of two tanks

This water is used for process through DM transfer pumps ( 3x17 m3/hr).

Raw water source -------------- KANDALERU CREEKRaw water quality :

Standard seawater composition Ion Concentration (mg/L)calcium 410 Magnesium 1,310 Sodium 10,900 Potassium 390 Barium 0.05 Strontium 13 Iron <0.02 Manganese <0.01 Silica 0.04 - 8 Chloride 19,700 Sulphate 2,740 Fluoride 1.4 Bromide C 65 Nitrate <0.7 Bicarbonate 152 Boron 4 – 5 Other TDS 35,000 mg/L Ph 8.1

WATER QUALITY SUMMARYS. No

Parameters Surface water

samples

Ground water

samples

Drinking Water StandardsIS-10500

DesirableLimits

Acceptable

Limits1 pH 8.2 - 8.3 6.8 - 8.3 6.5-8.5 6.5-8.52 TDS, mg/l 27220 –

29484182 – 3654 500 2000

3 Total Hardness, mg/l

5410 – 6870 84 – 754 300 600

4 Chlorides as Cl , mg/l

15824 – 16610

45 – 1388 250 1000

5 Fluoride as F, mg/l 1.29 – 1.30 0.51 – 1.1 1.0 1.5

6 Sulphates as SO4, mg/l

1175 – 1652 28 - 267 200 400

7 Total Coliform, MPN/100 ml

Nil Nil Should be absent

Should be absent

Comparison of Surface Water, Groundwater and Seawater

Parameter Surface Water Groundwater Sea Water

Temperature Variable Constant Variable

Suspended solids Low – High Absent Low - High

Turbidity Low – High Very low Low

Organic matter Low – High Very low -Low Low – High

Dissolved oxygen Near saturation Nearly absent Near saturation

Salinity Low – Medium Medium – High Very High

Water….Physical PropertiesAppearance : Clear Turbid Milky Color

Smell (Odor) : Petroleum Hydrogen Sulfide

Turbidity (NTU) : Measure of finally divided TSS that achieve Colloidal Dimension.

Suspended Solids : Measure of Impurities that are Suspended and can be

removed by Clarification, filtration.

Salinity : Removed in RO system

Dissolved Solids : Measure of Dissolved impurities. Sum of Impurities that occupy Inter Molecular Space. Removed

in DM.plant.

Conductivity : Part of Dissolved Solids that is fully or partially Ionized e.g. NaCl, CaHCO3.

pH : - log [H+] , Neutral = 7.0

Acidic < 7.0 > Basic

Gases : CO2 , O2, H2S

Floating Matter : Wood Chips, Plants, Oil

Clay, Silt, Organic Matter, Turbidity

Colloids

H+ OH-

Na+ K+ HCO3- CO3--

Ca++ Mg++ Cl- SO4-- NO3-

Fe ++ Mn ++ PO4---

Silica

Organics, COD Micro Organisms

ChemicalChemical PurposePurpose

Chlorine Chlorine Remove micro-organismsRemove micro-organisms

FeCl3FeCl3 Remove suspended SolidRemove suspended Solid

LimeLime Adjust pHAdjust pH

PolymerPolymer Support Alum (Reaction)Support Alum (Reaction)

Sulphuric Sulphuric Acid/HClAcid/HCl

Maintain pH(DM Maintain pH(DM Regeneration)Regeneration)

Ultasonic Flow Transmitter

KANDALERU CREEK

(2 X 2500 CUM/hr)

KL1

KL2

CWST(8000 CUM)

SWRO3 x 96

cum/hr

DST(1650 CUM )

BWRO(3 x 57.875 CUM/hr)

PERMEATE TANK

(200 CUM )

DM PLANT 2 X 30

CUM/Hr

DM TANK 300 CUM

DM TANK300

CUM

FILTERATION PLANT(274 CUM/hr)

• FLOW CHART 3xFOR WTP AT MEPL Obrivations: KL – Klaritube settlerCWST - Clarified water storage tankSWRO – Sea Water Reverse OsmosisBWRO - Brackish water RODST - Desalination Storage TankDM Plant - De mineralization plant

2X1260 CUM/Hr

SEA WATER INTAKE PUMP HOUSE EQUIPMENT

.

EQUIPMENT IN INTAKE SYSTEM :1.STOP LOG GATE2.TRASHRACK3.TRAVELLING SCREEN]4.SCREEN WASH PUMPS5.RAW WATER PUMPS

RWP-1

RWP-2

STOP LOG GATE

STOP LOG GATE

TRASH RACK TRASH RACK

TRAVELLING SCREEN

TRAVELLING SCREEN

SCREEN WASH PUMPS

SCREEN WASH PUMPS

Obrivation :RWP – Raw water Pump

SEA WATER INTAKE PUMPS : 2 NOS ( Raw Water Pumps ) 1 working & 1 STAND BY:

PUMP CAPACITIES :

Vertical motor :MAKE : ABB/MARATHONRATING : 280KWSPEED: 992 RPM IN VOLTAGE : 0.6KVFRAME : HXR 400 LD6

DUTY POINT :DISCHARGE : 2500CUM/HR

694.44LPSTOTAL HEAD : 25M

PUMP INPUT: 201.51KWPUMP SPEED : 980 RPM

SP GRAVITY : 1.03

PRE TREATMENT PLANT

Stilling chamber

Stilling chamber

Flash mixer Flash mixer

Parshal flume Parshal flume

kl1

kl2

Chlorination

RWP

FeCl3 PE lime CHEMICAL BUILDING

SMBS

SMB S - sodium meta bisulphate PE - polyelectrolyte FeCl3 -Ferric chloride

STILLING CHAMBER : To maintain contstant flow and break the turbulance in flow .

FLASH MIXER : FeCl3 as Coagulant and poly electrolyte as Flocculant are dosed in flash mixer

before going to klaritube settler .

PARSHAL FLUME : Ultrasonic flow meter is installed to measure to flow.

CHLORINATION

Chlorine not only removes bacteria but also eliminate taste, colour and controls algae, protozoa and fungi, improve coagulation and oxidies of iron and manganese.

Chlorine reacts with water to form hypochlorous acid (HOCl) and HCl

H2O + Cl2 HOCl + HCl

HOCl H+ + Ocl-

HOCL HCl + O (BACTERIA IS KILLED)

Raw water chlorination

Ejector system

Chlorination skidBooster pumps

Chlorine toners

700N

B ra

w

wat

er

line

Chlorination will be done either in stilling chamber ,or in pipe line .

Cooling water chlorination

Ejector system

Chlorination skidChlorination skidBooster pumps

Chlorine toners

COOLING TOWER SUMPCOOLING TOWER SUMP

FILTERATION PLANT (2 x 274 cum/hr)

KL1

KL2

CWST 8000 CUM

PSF-1PSF-1

PSF-2PSF-2

DMF-1

DMF-2

FILTER FEED PUMPS( 274 CUM/Hr)

CWST - Clarified water storage tank PSF - Pressure sand filter

DMF- Dual Media filter

SWRO PLANT (3 x 96 cum/hr)

CF-1 CF-2 CF-3

SWRO-1 SWRO-2 SWRO-3

SWRO HP PUMPS

SMBS

CF- Cartridge filterSWRO-Sea water Reverse Osmosis

SMBS- Sodium meta bi sulphate

Antiscalent

SWRO 3 streams Each of 96 cum/hr

Brakish water and Sea water Water salinity based on dissolved salts in

parts per thousand (ppt) Fresh water Brackish water Saline water Brine

< 0.5 0.5 – 30 30 – 50 > 50

( BWRO plant- 3x 54.875cum/hr)

BWROPERMEATE200 CUM

BWROPERMEATE200 CUM

SWRO PERMEATE STORAGE FOR

BWRO FEED150 CUM

SWRO PERMEATE STORAGE FOR

BWRO FEED150 CUM

SWRO PERMEATE FOR SERVICE WATER AND

POTABLE WATER STORAGE TANK

400 CUM

SWRO PERMEATE FOR SERVICE WATER AND

POTABLE WATER STORAGE TANK

400 CUM

SWRO PERMEATE FOR FIRE WATER STORAGE

TANK1100 CUM

SWRO PERMEATE FOR FIRE WATER STORAGE

TANK1100 CUM

CF-4 CF-5CF-5 CF-6

Ro feedpumpsRo feedpumps

PLANTPLANT

BWR0BWR0 BWRO HP PUMPSBWRO HP PUMPS

DM FEED PUMPS

Blower Blower DegasserDegasser

BWRO - Brackish water Reverse Osmasis

DM PLANT(2streams x 30 cum/hr) (capacity-30cum/hr)

SAC-2 SBA-1 SBA-2 MB-1 MB-2SAC-1

DM Tank-1300 m3

DM Tank-1300 m3

DM TANK-2300m3

DM TANK-2300m3

TO PROCESS

SAC- Strong acid cation SBA- Strong base Anion

MB-Mixed Bed filter

DM

Fee

d pu

mps

SLUDGE SYSTEM

KL1KL1 KL2

SLUDGE PIT

BLOW DOWN TO SLUDGE PIT

CREEK

SLUDGE TRANSFER PUMPS

44 cum /hr

SWRO CLEANING SYSTEM

CIT-2CIT-2CCF-1CCF-1

Swro -1

Swro-2

Swro-3

DRAIN TO N-PIT

CCF-Cleaning cartridge filterCIT-Cleaning inspection tank

BWRO CLEANING SYSTEM

CIP-1CIP-1CCF-2CCF-2

Bwro -1

Bwro-2

Bwro-3

DRAIN TO N-PIT

CCF-Cleaning cartridge filterCIT-Cleaning inspection tank

MORPHOLINE DOSING SYSTEM

DMTANK-1300m3

DMTANK-2300m3

DMTANK-2300m3

MORPHOLINE DOSING SYSTEM DM TFR PUMPSDM TFR PUMPS

TO PROCESS

Morpholine dosing pumps

Potable water system

BWROPERMEATE200 CUM

SWRO PERMEATE FOR FIRE WATER STORAGE TANK

1100 CUM

SWRO PERMEATE FOR FIRE WATER STORAGE TANK

1100 CUM

SWRO PERMEATE FOR SERVICE WATER AND

POTABLE WATER STORAGE TANK

400 CUM

SWRO PERMEATE FOR SERVICE WATER AND

POTABLE WATER STORAGE TANK

400 CUM

SWRO PERMEATE

STORAGE FOR BWRO FEED

150 CUM

SWRO PERMEATE

STORAGE FOR BWRO FEED

150 CUM

Permeate tank

LimeStone

column

LimeStone

column

Potablewater tank

Potable water tank

NaOHSoda ash

NaOCl

Potable water pumps

Dosing pumps

DM Regeneration system

SWRO

pe

rmea

te ta

nkD

esal

inati

onta

nk

SW

RO

perm

eate

tank

Des

alin

ation

tank

MHLSAC

MAKSAK

MHLMB

SAC SBA MB

MAKMB

N-pITN-pITCMB

SAK SHL

SAK SHL

CMB

DM

FEE

D P

UM

P32

x37

m3/

hrD

M F

EED

PU

MP

32x3

7 m

3/hr

Continued.

MODIFICATIONS,REJECT(EFFLUENT)SYSTEM, INTERLOCKS ,PROTECTIONS, SEQUENCE OF

OPERATIONS, WILL BE GIVEN PROGRESSIVELY.

References: 1.DRG No pp064 M 002 2. DRG NOWFMAA00025