Effluent Treatment Plant or ETP is one type of waste water treatment method which is particularly designed to purify industrial wastewater for its reuse and its aim is to release safe water to the environment from the harmful effect caused by the effluent. Helping achieve a greener society

1. EffluentTreatmentPlant–Fertiliser
Industry

2. About Fertilizer Industry
Chemical Fertilizer Industry Phosphatic Fertilizer (DAP, NPK
grades , Single superphosphate
Nitrogenous Fertilizer ( Urea) ,
calcium ammonium nitrate,
ammonium sulphate etc
 Sulphuric Acid
 SSP
 DAP / NPK
 Sulphuric Acid
SSP
 DAP / NPK
 Phosphoric acid
 Sulphur
 Rock Phosphate
 Phosphoric acid
 Ammonia
 MOP
RAW MATERIALS MFG PLANTS PRODUCTS
Phosphatic Fertilizer Complex
Products and Raw materials :

3. Integrated Process

4. Why ETP plant is required ?
ETP (Effluent Treatment Plant) is a process design for treating the industrial
waste water for its reuse or safe disposal to the environment. Removal of
high amounts of organic compounds debris, dirt, grit, pollution, toxic, non-toxic
materials and polymers etc. from industrial effluent
How may ETP plants are there ?
1. Effluent Treatment Plants (ETP)
2. Sewage Treatment Plants (STP)
3. Common and Combined Effluent Treatment Plants (CETP).
Benefits :
Provides clean, safe water processed..... Reuse of water.
Saving you money. ...
Beneficial to the environment. ...
Saving water. ...
A way to minimise waste
Objective of Effluent Treatment

5. Treatment Levels :
 Primary
o Example: pH control, coagulation, chemical precipitation and oxidation.
 Secondary
o Biological process ( Activation sludge process/ Membrane bioreactor
/Moving Bed biofilm reactor)
 Tertiary
o Disinfection using Sodium hypochlorite
Treatment Mechanisms :
 Physical
 Chemical
 Biological
Treatment Level & Mechanism of ETP

6. Characteristics of Influent Fertiliser Industry
 Waste water Generated from Sulphuric acid plant :
Waste heat boiler blowdown , acidic waste water from spillage , leakage of plant and equipment.
 Waste water generated from Single Superphosphate plant :
Effluent bearing phosphate , fluoride , suspended soild, Low PH from scrubber and nearby surface drains.
 Waste water generated from DAP/NPK plant:
 Waste water from draining and washing of equipment containing phosphate , fluoride and low PH
Others cooling tower , boiler blowdown utility effluent high TDS
 Waste water generated from phosphoric acid plant:
Gypsum pond water containing high phosphate and fluoride
Waste water generated from ammonia , urea plant:
Ammoniacal Nirogen , Total Nitrogen , kjeldahl Nirogen , Nitrate Nirogen etc process condensate .

7. ETP Process & Block diagram –Phosphate &
Fluoride removal
Equalisation
Tank
FM-1 FM-2 FM-3
Clarifier
Sludge
Drying Bed
DM plant regeneration & RO reject
Cooling tower & boiler blowdown
&Sulphuric acid plant floor wash
,
DAP/ SSP Plant
wash water
Sludge
Thickener
Semi Solid Sludge
disposed to WBWML,
TSDF facility
Overflow
PSF
Treated effluent
discharge to drain
Underflow
Polyelectrolyte
ETP sludge
Flter liquor of
ETP Sludge
ETP operation is physicochemical
process to remove phosphate and
fluoride
In FM 1, dry lime is added to maintain
pH of the solution (12 -12.5) .Phosphate
and fluoride is removed as precipitate of
calcium phosphate and calcium fluoride
 in FM 2 alum solution is added to
maintain pH 10-10.5 . At pH
10.5, rate of reverse reaction
Ca+F2 CaF2 decreases.
 Hydrochloric acid is added in FM3
to maintain pH discharge limit
( 6.5-8.5)
 Polyelectrolyte is added in FM3
overflow to Clarifier for settling of
sludge.
 The wet solid sludge collected is
sent to WBWML, a TSDF Facility.
Polyelectrolyte
Polyelectrolyte
HCL
Alum Solution
FM – Flash Mixture
PSF-Pressure Sand Filter
STP- Sewage treatment
plant
Dry lime
/lime
Soln
Partially use in DAP&
SSP plant

8. PFD of ETP

9. Improvement based on treatability study
Sl No Area of
Improvement
As Design Improvement over design
1 FM#1 (Flash Mixer) Lime solution
addition system &
maintain pH 12.0 –
12.5 manually.
Dry lime addition system with screw conveyor fitted with VVF
drive & on-line pH measuring device to control process.
2 FM#2 (Flash Mixer) Alum solution
addition to maintain
pH 7.5 – 8.5
manually.
Control valve along with flow meter provided at feed line to auto
control pH and range changes to 10.0 – 10.5.
3 FM#3 (Flash Mixer) Poly electrolyte
addition by metering
pump inside clarifier.
HCl dosing to control pH at 6.5 – 8.5 with auto dosing facilities.
Poly electrolyte added to O’flow of FM3
4 Online analyser
Installation
PH, fluoride, BOD, COD, TSS parameter measuring analyser
5 Pump tripping with
high discharge value
- Final dischrage pump tripping logic with high value than
permissible limit
6 Display of all
parameters of
discharge in ETP
Plant & Alarm/Hooter
system
- Final discharge all parameters are displayed in plant for better
monitoring. Alarm /hooter system installed in case of any
sudden rise of any parameter in final discharge
7 ETP Sludge handling Mix with Gypsum Construction of sludge drying bed

10. ETP Discharge Norms
Sl No Pollutants
Prescribed Standards
(Consent Limits)
1 pH Between 6.5 - 8.5
2 TSS Not exceed 100 mg/L
3 BOD Not exceed 30 mg/L
4 COD Not exceed 250 mg/L
5 Oil & Grease Not exceed 10 mg/L
6 Phosphate Not exceed 5 mg/L
7 Fluorides Not exceed 10 mg/L
8
Ammonical
Nitrogen as N
Not exceed 50 mg/L
9
Kjeldhal
Nitrogen as N
Not to exceed 75 mg/L
10
Free Ammonical
Nitrogen as N
Not to exceed 4 mg/L

11. Domestic Process Flow Diagram
Domestic
Receiving Tank
Aeration Tank
Domestic
Clarifier
Up-flow
Filter
Sludge drying
bed
Dom.
Treated
water
sump Dom.
PSF
Dom. Treated
water dis.
sump
Domestic sludge
tr. pump
NaOCl
Urea + DAP
To final discharge
Sewage input from toilet ,
canteen waste water