EFFLUENT TREATMENT PLANT

By

G. H. Trivedi, SEE

J. D. Kalyani, R.O.

23rd October, 2012

26th November, 2012

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• ABOUT WASTE WATER

• EFFLUENT TREATMENT – FUNDAMENTALS

• EFFLUENT TREATMENT METHODOLOGIES

• PRIMARY TREATMENT OF EFFLUENT

• SECONDARY TREATMENT OF EFFLUENT

• TERTIARY TREATMENT OF EFFLUENT

• ADVANCE TREATMENT OF EFFLUENT

• DISPOSAL OF TREATED EFFLUENT

• SLUDGE DEWATERING

CONTENTS OF PRESENTATION :

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Effluent is

“wastewater - treated or untreated - that flows out of a treatment plant, sewer, or industrial outfall. “

-US EPA

“Trade effluent” includes any liquid, gaseous or solid substance which is discharged from any premises used for carrying on any [industry operation or

process, or treatment and disposal system], other than domestic sewage.

- Water Act 74

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EFFLUENT TREATMENT

“The mechanisms and processes used to treat

waters that have been contaminated in some

way by manmade industrial or commercial

activities prior to its release into the

environment or its re-use.”

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FROM WHERE WASTEWATER ORIGINATE ?

Wet processing – raw material / product

Process wastewater

Exhausted scrubbing media

Cooling

Cleaning

Washing – floor, equipments, drums / plastics / liners

decontamination,

Blow down / Bleed

MEE condensate, RO reject, leachate

Laboratory

Workshop 5

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FROM WHERE WASTEWATER ORIGINATE ?

D. G. Set room

Contaminated runoff / water

Spray dryer runoff

Contaminated water from dyked area / storage area

Contaminated fire fighting waste water – drain / channel

within premises including toxic chemical & pesticides

storage area connected to retention basin for collection

of such waste water be provided and shall then be

provided appropriate treatment.

Leakages

Sewage…….. 6

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EFFLUENT TREATMENT - FUNDAMENTALS

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EFFLUENT TREATMENT - FUNDAMENTALS

Effluent treatment Units fall into

two divisions

Unit Operations - treatment /

removal of pollutants is

brought about by Physical

forces

Unit Processes - pollutants’

removal is brought by chemical

and biological reactions 8

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Effluent Treatment - Methods

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EFFLUENT TREATMENT – ADVANCE METHODS

Fenton treatment – Oxidation Process

Hypo treatment – Sodium Hypo Chloride solution

Electrochemical / coagulation treatment

Ozonization

Wet air oxidation

FACCO – Fenton Activated Carbon Catalytic Oxidation

Membrane Separation

Multiple Effect Evaporation System

Incinerator

RO System

MBR

Tritron Aerators, liquid Oxygen injection in aeration tank

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These advance methods act as

• Pretreatment to enhance the treatability of the

conventional treatment units

• Polishing treatment

• Alternate to conventional treatment

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EFFLUENT TREATMENT – ADVANCE METHODS

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STREAM WISE TREATMENT

COD

HIGH

LOW

BOD

BOD

HIGH

HIGH

LOW

LOW

TDS

TDS

TDS

TDS

HIGH

HIGH

HIGH

HIGH

LOW

LOW

LOW

LOW

FORCED EVPORATION

FOLLOWED BY BIOLOGICAL

TREATMENT-I

BIOLOGICAL TREATMENT-II

INCINERATION-III

SOLVENT/CHEMICAL RECOVERY-

IV

FORCED EVAPORATION

FOLLOWED BY BIOLOGICAL

TREATMENT-I

BIOLOGICAL TREATMENT-II

FORCED EVAPORATION

SOLVENT/CHEMICAL RECOVERY-

IV

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EFFLUENT TREATMENT METHODOLOGIES

Important effluent parameters Flow / Volume

Flow / volume details from source to ETP / treatment equipment

Plant wise / stream wise collection – treatability can be checked and treatability report shall be asked

Characteristics

Physical, chemical and biological

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CHARACTERIZATION – EFFLUENT

Physical properties

Colour / Odour / Solid (SS / Coarse / Grit) /

Temperature

Chemical constituents

Organic

Oil & Grease / Pesticides / Phenols / Proteins /

Surfactants / VOC / Other chemicals / COD/

Carbohydrates / Fats / Methane etc

Inorganic

Alkalinity / Chlorides / Heavy Metals /

Ammonical Nitrogen / pH / Phosphorus / Sulfur

/ H2S

Biological constituents

BOD/ Microorganisms / tree leaves

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EFFLUENT TREATMENT METHODOLOGIES

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STREAM WISE SEGREGATION & TREATMENT

High / Refractory COD waste water

Refractory COD is organic compound that show up in COD test as being

chemically oxidizeable but not readily biodegradable e.g. some detergents

(alkyl benzene sulphonate), EDTA, NTA, Halogenated organics, PCB , some

organic acids

FACCO, FENTON, MEE, Incineration, Electro Oxidation, Ozonisation etc.

High TDS wastewater

Treatment with RO, MEE, evaporation, spray dryers etc.

MEE is mainly used to treat high TDS & low COD effluent. However, High

TDS & refractory/high COD; low TDS & refractory/high COD can also be

treated with MEE as shown in previous slide. In MEE, water is boiled in

sequence of vessels each held at lower pressure than last. Vapour boiled off

in one vessel is used to heat next vessel and reduces steam consumption.

Generated solid waste can be by-product or landfillable waste. Generated

condensate can be recycled back in process or can be treated in ETP.

Concentrate generated from MEE as a result of treatment of low TDS & high

COD shall be sent for incineration and/or for co-processing.

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STREAM WISE SEGREGATION & TREATMENT

High NH3- N bearing wastewater

Recovery of ammonia or salt of ammonia, stripping,

nitrification-de nitrification, MAP , use as raw

material for other product etc.

Toxic

Detoxification and Incineration

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STREAM WISE SEGREGATION & TREATMENT

Heavy Metals

Alkaline sedimentation / filtration

Dilute waste water

Conventional Treatment methodologies together with

advance treatment methodologies, if required

Inorganic

Primary treatment and sedimentation / filtration

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WASTEWATER TREATMENT

Preliminary treatment

Primary treatment

Secondary treatment

Tertiary / polishing treatment

Advanced treatment

Sludge (bio solids) disposal

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PRIMARY TREATMENT OF EFFLUENT

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PRIMARY EFFLUENT TREATMENT

Preliminary treatment :-

Screening

Grit removal

Stream wise pretreatments :-

Physical separation

Chemical treatment

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PRIMARY TREATMENT –UNITS/EQUIPMENTS

Primary treatment removes -

Suspended (Organic & inorganic)

Colids

Reduces the organic load (BOD) on the secondary

units

Primary treatment consists -

Oil and Grease trap / API Separator

To remove Oil & Grease from raw effluent. Oil &

Grease trap is chamber so arranged that floating

matter (Oil & Grease) rises and remains floated

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PRIMARY TREATMENT –UNITS/EQUIPMENTS

Collection / Equalization / Neutralization Tank Equalization of fluctuating effluent flow will make

hydraulic pollutant loading more uniform and may

improve effectiveness or reliability of essential treatment

process

Flow equalization is used to overcome downstream

problems caused by flow rate variations, to improve

performance of downstream process and reduce the size

& cost of downstream treatment facilities.

Batch process / continuous process / day shift / night shift /

seasonal products / holidays / weak ends / shut down – are

often associated with fluctuation in pollutant loading

Chemical Neutralization is required to bring the pH of

effluent to neutral range. Normally, lime treatment is

required

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PRIMARY TREATMENT –UNITS/EQUIPMENTS

Chemical coagulation and Flocculation

Coagulation :- Effect of chemical to colloidal particles, resulting

in particle destabilization

Flocculation :- Process of agglomerating destabilized colloids

after coagulation with gentle stirring. Smaller particle suspended

in solution come together as larger aggregates (flocks)

Chemical feeding system

Chemicals are introduced into effluent for coagulation and

flocculation. Chemicals are added as solutions or dilute

suspensions. As treatment is continuous process, flow of

chemicals is regulated and measured continuously through

chemical feeders. Feeding system can be either pumps for liquids

or charging system with hoppers for solids like lime

Mixing tank

Chemical coagulants are added in mixing tank to effluent where

it is thoroughly and vigorously mixed so that coagulant gets

uniformly dispersed into entire mass of effluent

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PRIMARY TREATMENT –UNITS/EQUIPMENTS

Primary settling tank / clarifloculation

Objective of primary sedimentation is to provide sufficient time

under quiescent conditions for removal of settleable solids by

force of gravity

The overflow from primary clarifier will go to biological

treatment

Sludge dewatering

Generated sludge from primary clarifier is to be taken out and

dewatered. For sludge dewatering system, industry can use

sludge drying beds / filter press / centrifuges / RVDF / Super

decanter etc. Generated sludge can be disposed off to TSDF and

generated filtrate can be taken back for treatment in ETP

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PRE-TREATMENT

Pre-treatment is required to remove certain pollutants

at the initial stage e.g. removal of Cyanide, Heavy

Metals

Helpful for improving the performance of effluent

treatment plant

Stream wise pretreatments :- Physical separation

(Solvents, products etc) and Chemical treatment

(Fenton, Electrochemical oxidation, FAACO, Ozonation

etc ) .

Screening, Grit removal

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INSPECTION POINTS

Oil & Grease Trap

Compliance to requirement of minimum detention time

Acid proof lining and Sludge cleaning provision

Adequacy of O & G trap

Regular removal of oil and proper collection and

storage at specific location so as there is no spillage

Regular cleaning of traps

Regular removal of bottom solid

Oil disposal / fuel / sent to registered recycler

Adequacy of O&G trap

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INSPECTION POINTS

Collection / Equalization / Neutralization tank

Compliance to minimum requirement of detention time, power / air

supply / mixing mechanism

Size of tank vis-à-vis effluent generation quantity

Buffer tank to store non-regular effluent – may be slowly mixed with

regular flow so as there is no shock load

Effluent receiving lines with measurement devices

Pumps (one regular – electricity driven and one standby pump – diesel

driven)

Tank cleaning provision

Tank overflow – shall be equipped with reflux or level controller like

mechanism to prevent overflow

Foaming / oil and grease floating

Bubbles are rising from bottom

High VOC and odour problem

Acid proof lining and leakages problem

Buffer tank to store non regular effluent – slowly feed control and

regulate flow 28

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INSPECTION POINTS Chemical coagulation and Flocculation

Compliance to requirement for detention time, flow, depth of

tank

Effluent inlet with constant flow

Chemical charging system with constant flow

No settling , low turbulence

Chemical solution preparation tank

Large ETPs – mechanism for metered dose of flocculants

proportionate to flow

Flash mixing tank – square / circulating tank with high speed

agitator and motor

Stock of chemical

Record of chemical consumed

Suggested design parameters

Design parameters vary depending on effluent quality and

quantity from different sector of industries. For arriving

design parameters, jar test is required

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INSPECTION POINTS

Chemical Feeding System

Separate tanks for each chemicals

Feeding of different chemical at required location in

requisite quantity to achieve maximum efficiency

Proper MoC and agitator / air sparger provided or not

Effluent with VOC and ammonia shall not be subjected to

compressed air

Proper flow control system – (metering pump)

Batch – in ETPs with capacity less than 100 KLD, batch

mode of chemical dosing is OK

Continuous – in ETPs with higher capacity, continuous

or semi-continuous addition of chemicals will be

desirable

Proper chemical charging system (platform)

Weight balance

Chemical storage (room) with safety equipments

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INSPECTION POINTS

Primary Settling Tank / Clariflocculator

Compliance to design criteria like detention time,

depth of tank, surface overflow rate, weir overflow

rate, weir length for circular clarifier, scraper

revolution, sludge removal interval, design of launder

Removal of accumulation from influent and effluent

baffles, weirs and scum box

Cleanliness of all inside exposed walls / channels

Black and odorous septic effluent in primary

treatment – not desired

Floating sludge indicate excessive sludge

accumulation in tank

Sludge drain line chocking problem

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INSPECTION POINTS

Primary Settling Tank / Clariflocculator

Low solid concentration in sludge due to short

circuiting

Excessive corrosion of metal due to Hydrogen Sulfide

gas

Uneven overflow

Continuous clear overflow - desired

Clarifier drum leakage problem due to corrosion

Frequency of sludge removal

For up-coming plant underground clarifier (primary

or secondary) shall be avoided. Above ground clarifier

with proper conical bottom shall be provided.

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SECONDARY TREATMENT OF EFFLUENT

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Biological unit processes are of three type

Aerobic : A process requiring the presence of oxygen

Anaerobic : A process from which air or oxygen not in chemical combination is excluded

Facultative process : Combination of Aerobic and Anaerobic process

Remove biodegradable matter (organic matter)

from wastewater

APPLICATION OF BIOLOGICAL UNIT OPERATIONS IN

WASTEWATER TREATMENT

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SECONDARY TREATMENT Secondary treatment is a biological process Degrade organic content (dissolved organic matter) Utilizes bacteria and algae to metabolize organic matter

in the wastewater Added bacteria and protozoa 3 different approaches

Fixed film system Suspended film system Lagoon system

Attached Growth Process / Rotating Biological Contactors – attached Growth Processes include trickling filter, roughing filter, rotating biological contactor, and fixed film nitrification reactor. Organic material present in wastewater is degraded by population of micro-organisms attached to filter media

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INSPECTION POINTS

Secondary treatment Units

Compliance to design criteria viz. detention time, oxygen supply,

microbes concentration etc.

Dissolved Oxygen concentration in aeration tank – preferabably 1

to 2 mg/lit. Hence on-line DO analyzer required

Concentration of TDS. Hence on-line TDS analyzer required

TDS meter shall be provided on primary clarifier outlet

On line TDS analyzers are useful in the inlet of RO System

and in the permeate line of RO System

In industries where there is huge fluctuation in dissolved

solids, TDS meter may be helpful in controlling TDS in

biological reactor

MLSS, MLVSS - on spot check by volumetric cylinder – should be

fast settling

Foaming in aeration tank - Very high or no foam is not desired

Inlet and outlet flow

Chocking of diffusers

Uniformity of supply of air / oxygen

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INSPECTION POINTS Secondary treatment Units

Mechanism and frequency of recycling of sludge

Regular cleaning

Foul smell from anaerobic unit

Closed handling system can remove foul smell with regular preventive

maintenance

H2S coming out can be scrubbed with caustic sol., hypo sol. or advance

technology like SRB scrubber (Sulphur Reducing Bacteria)

Rate of gas generation, its collection and utilization e.g. methane

Efficiency of removal of organic load

By measuring inlet COD / BOD and outlet COD / BOD levels

Removal efficiency can also be calculated by taking inlet kg BOD load

(quantity X concentration) and outlet kg BOD load. Efficiency is defined as

(Inlet BOD load – outlet BOD load) / inlet BOD load

Health of microbes – brownish colour indicates healthy biomass

Seeding of specially cultured microbes – for improved efficiency

Carryover of biomass – short circuiting

Sludge wasting

Excess activated sludge produced each day must be wasted to maintain

given food-to-microorganism ratio or mean cell-residence time. Most

common practice is to waste sludge from return sludge line because it is

more concentrated and requires smaller waste sludge pumps

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INSPECTION POINTS RBC

Rotating biological reactor consists of series of closely

spaced circular disc of polystyrene or poly vinyl

chloride

In operation, biological growths become attached to

surfaces of disc and eventually form slim layer

pH in aerobic

To maintain in the range of 7 to 8

Aerobic System

Aerobic biological system used to remove organic

matters from wastewater in the presence of air

Anaerobic System

Anaerobic biological system used to remove organic

matters from wastewater in the absence of air 38

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INSPECTION POINTS – SECONDARY TREATMENT

• Compliance to design criteria Viz detention time, oxygen supply,

microbes concentration

• Dissolved oxygen concentration in aeration tank- preferably- 1 to 2

mg/lit . Hence on-line DO analyzer required

• MLSS,MLVSS – on spot check by volumetric cylinder – should be

fast settling

• Foaming in aeration tank- Very high or no- foam is not desired

• Inlet and Outlet flow

• Chocking of diffuser

• Uniformity of supply of oxygen

• Mechanism and frequency of recycling of sludge

• Regular cleaning

• Foul smell from anaerobic unit

• Rate of gas generation , its collection and utilization

• Efficiency of removal of organic load.

• Health of microbes- golden brownish color indicate healthy

biomass , Normal & flock –foaming

• Flock of size pin point – Excessive solid carry over 39

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INSPECTION POINTS – SECONDARY TREATMENT

• Sludge riding on the waves – This is normal sludge but can not

settle because of excess incoming flow(Hydraulic) and load .

• Sludge over-aerated – it entrapped air bubble. This problem is

caused where grease or oil has prevented the escape of air bubble

• Dispersed growth of microbes in the sludge – colour is white,

brown, grey and particle remain in the uniform suspension even

for 30 minute test period . shows a lack of bacterial build up in the

mixed liquor , the sludge is watery certain to occur when the

concentration of soluble organic extremely high. Microscope

shows filament growth

• Broken or sheared flock , deflocculating – otherwise a normal flock

but the sludge has undergone some sort of shock.

• Sludge rising – Entrapped Nitrogen gas Settle well in 30 minute

but again rise to top becoming lighter than water . This is driven

by entrapped gas bubble . The sludge floats on water surface in

large chunks of color light brown – Higher nitrogen compound

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INSPECTION POINTS – SECONDARY TREATMENT

• Sludge floating – if the sludge is floating for a small duration and

small amount may be taken as normal . this may be due to

presence of some filamentous bacteria or dead fungi

• Bulking sludge – Two type buoyant (a) Bound water – A flocculated

a sludge with high SVI and a low settling rate . The sludge flock

has large area and contain bound water , Generally an under-

oxidised and young sludge . (b) filament growth- colour light

brown, grey or white . Odor is sweet or fruity . settling is low SVI

180 above

• Seeding of specially cultured microbes – for improved efficiency

• Carry over of biomass – short circuiting

• Sludge wasting cycle

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TERTIARY TREATMENT OF EFFLUENT

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INSPECTION POINTS

Tertiary treatment Units - Pressure sand filter / carbon

adsorption etc

Adequacy with regard to surface area vis-à-vis effluent load

Capacity of pump with stand by pump – shall be provided

with pressure gauge and safety valve / pressure release valve

and in case of over pressure spilled waste water shall go to

catch pit

Piping – coding of inlet / outlet / backwash pipe lines

Backwashing facility, frequency, final disposal of

backwashing waste water – Sand filter

Frequency of reactivation of activated carbon – how

frequency is decided?

Whether used continuously or intermittently?

Carbon Iodine value checking records and replacement

Spent carbon disposal

Pressure gauge – In let & out let flow

Sight glass on pipeline, Flow direction marking

Cleaning frequency

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ADVANCE TREATMENT OF EFFLUENT

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INSPECTION POINTS

Advance treatment Units

Multiple Effect Evaporation

Adequacy of MoC vis-à-vis effluent characteristics

Uniformity in characteristics of feed

Proper segregation of effluent to be evaporated

Requirement of any pre treatment – solvent

stripper

Adequate supply of heat energy – calendria

temperature – preferable between 80 to 90o C

Adequate time for evaporation

Regular checking for scaling and removal, if any

Leakages

Management of condensate, concentrate, stripped

solvent , mother liquor, salts etc.

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INSPECTION POINTS

Advance treatment Units

Multiple Effect Evaporation

Adequacy of MOC vis- vis effluent characteristics

Uniformity in characteristics of feed

Proper segregation of effluent to be evaporated

Requirement of any pretreatment –solvent stripper , antiscalent

dosing , pH adjustment

Adequate supply of heat energy – calendric temperature preferable

between 80 to 90o c

Adequate time for evaporation & % distillate

Regular checking for scaling and removal , if any

Leakage in pump , body seal

Vacuum , gauge

Online TDS meter on condensate

Insulation on parts

Flow of liquid -marking on pipeline

Use of antifoaming agent

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INSPECTION POINTS

Advance treatment Units

Multiple Effect Evaporation

Analysis of feed , condensate , concentrated mass

Management of condensate , concentrate , stripped solvent , mother

liquor salts etc

Adequacy of salt removal facility – centrifuge , filter nutch , ATFD

Metering device with totalizer on various important line –inlet ,

condensate, reject

Energy meter , steam meter separate

Cleaning frequency

Log book

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SAMPLE OF MEE LOG BOOK

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INSPECTION POINTS Advance treatment Units

Reverse Osmosis

Uniformity in characteristics of feed

Pretreatment like filter cartridge filter to remove SS and colloidal

material if any . Addition of descaling , pH adjustment

Online- Conductivity meter , pH ,Temp

Online pressure measuring device

Cleaning frequency – Short cleaning , Long cleaning – Dosing of

cleaning agent

Leakage – spillage , storage tanks for Feed , permeate , reject

Flow marking on pipeline

De-gasifier and packing ring

Fouling of membrane – silica , algae , salt

Metering device with totalizer on various important line –inlet,

permeate , reject

Recycling of permeate

Reject handling methodology : Rejects can be treated in ETP or can be

evaporated in batch evaporator or in MEE

Log book

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SAMPLE OF R.O. LOG BOOK

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SA

MP

LE

OF

ET

P L

OG

BO

OK

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Record Keeping by CETP member Valid membership certificate

Certificate from competent authority indicating that industry do not

have any other mode of disposal – underground drainage connection

Month wise

Production taken

Water consumed

Chemical consumed, energy consumed, sludge generated, if

treated in-house

Number of tankers and quantity of waste water sent to CETP –

stream wise, if any

Quality of effluent sent to CETP

These records shall be verified for quantity and quality with

respect to data submitted at the time of taking membership as

well as those submitted under application forms for CCA

Number of tanker(s) received back from CETP on account of non-

conformance to inlet / acceptance criteria and its further

management

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LOG BOOK FOR AMMONIA BEARING STREAM

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Sr

No

Month Pruduct /

Production

Generation of

Soln Having NH3

In-house consumtion of solutions

having Ammonia for making

other products

Sell / Disposal of solutions having

Ammonia (please also submit

copy of valid documentary

evidences e.g. Bill, Receipt,

Challan, Gate Pass etc for each

such consignments)

(Name / Qty) [Name / Qty (Kls)

& Conentration

(%) ]

Name of Soln

and Quantity

(KLs)

Name of

Product &

Quantity

Name of Soln

and Quantity

(KLs)

Name, Address

of receiving

party 1

2

3

Details of Generation / Sell / Inhouse consumtion of Solutions having Ammonia Name of Industry :

Address :

Name of Products :

(Generating Ammonium Chloride / Ammonium Carbonate / Ammonium Acetate / Ammonium Bromide / Liquor

Ammonia / Other solutions having Ammonia)

Name and Designation of authorised person of the industry :

Name and Designation of authorized person of the industry :

Signature: :

Seal / Stamp of the industry :

Note: Please maintain daily logbook for generation and disposal of solutions having Ammonia and submit copy

at the end of month.

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METERING & MONITORING OF FLOW

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METERING & MONITORING OF FLOW

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DISPOSAL OF TREATED WASTE WATER

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INSPECTION POINTS

Disposal of treated waste water

Provision of totalizer on final treated waste water discharge line /

recycling line

Provision of disposal tank with sampling bottle to ensure

representative sample of the effluent that is being disposed

Quantity of disposal vis-à-vis consented quantity

Mode of disposal vis-à-vis consented disposal

Any dilution with fresh water prior to disposal or at any stage of

effluent treatment – comparison of TDS at inlet / outlet

Adequate availability of dedicated land with grid network for treated

waste water application for irrigation / plantation – 1 m2 for 5 lit

Reuse / recycle of treated waste water / permeate

Effluent carrying pipe network above ground or underground

Any bye pass – shall be investigated

Calibration of flow meters

Housekeeping and labeling

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DISCHARGE PIPE DIAMETER – CONTINUOUS FLOW

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Description Quantity Unit Remark

100.00 KL per day

5.56 KL per hour Considering total discharge in 18 hours

0.0015 m3/s

Velocity 0.8000 m/s Minimum velocity in pressurized pipe lines

Cross Section Area of

pipe0.0019 m2

0.05 m

49.57 mm

50 mm Rounded

Q = A V

A = Q/V

V = 0.8 m/sec (assumed)

CCA Quantity

Dia. Of pipe

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Free flow outside sampling chamber

Schematic

Note d1: Diameter of the discharge line should be such that it can not allow discharging the daily flow in a

shorter duration say 2 – 3 hrs. Daily discharge strictly as per CCA, should take at least 18 – 22 hrs a day

Sample bottle 20 liter volume

Ground level

Dead volume (depth of dead

volume ~ 6 inch)

To GIDC chamber

Sampling point

Pump discharge pipe dia d1

Compound wall

Final Treated Effluent

Geometric volume of the tank 10 m3

Treated Effluent

Holding Tank

Valve

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SLUDGE DEWATERING

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INSPECTION POINTS

Sludge dewatering : Sludge drying bed / centrifuge /

vacuum filters / filter press / Belt Press / RVDF etc.

Physical condition of SDB – no cracks

Condition of sludge in SDB

Foul smell

Leachate collection system and leachate handling

methodology

Appropriateness of the sludge dewatering system adopted

vis-à-vis quantity and characteristics of the sludge generated

Appropriateness of disposal of sludge to TSDF vis-à-vis

acceptance criteria of TSDF

Sludge transferring, storage and loading

Logbook

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INSPECTION POINTS

Other Infrastructure / facility

Separate energy meter

Laboratory

Skilled work force, Qualified people for Advance Treatment

Supervision of middle management personnel : More in Field

No extra / old pipe network

Proper access point

House keeping

Preferably no underground effluent conveyance – from plant

to disposal.

Open surface drain from plant to ETP to be avoided, if

effluent contains VOC.

Sufficient lighting

Proper and safe accessibility and visibility to discharge point

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INSPECTION POINTS

Other Infrastructure

Detailed ETP diagram with piping and colour coding

Flow meter and back up battery both in sealed condition.

Repairing of metering devises on urgent basis along with its

relevant entry in log-book.

Calibration of meters

Availability of suitable PPEs and spare parts

Connectivity of on-line analyzer with XGN by concerned

industry

Potential Industries to be sensitized and motivated to reduce

generation of T/E and to recycle more and more treated

effluents in plant and processes

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THANK YOU… 64

For further knowledge/information

books like Wastewater Engineering

Treatment and Reuse by Metcalf &

Eddy, Perry’s Chemical Engineers’

Handbook by Don W. Green & Robert H.

Perry etc. may be referred.

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