Required Chemicals and Their Functions in Biological Effluent Treatment Plant (ETP)


The effluent generated from different sections of a textile industry must be treated before they are discharged to the environment. Various chemicals and physical means are introduced for this purpose. Some chemicals are used to treatment those wastage polluted water. Here chemicals name are given which are used in effluent treatment plant.

Required Chemicals and Their Functions in Biological ETP:
H2SO4:
Function: Neutralize the waste water controlling the PH. It is auto dispensed in the neutralization tank.

Polyelectrolyte:
Function: Used for sedimentation / sludge coagulation and also killing bacteria.

Antifoaming Agent:
Function: Used for reduction / controlling foam. It is used auto / manually in the distribution tank.

De-colorent:
Function: Used for removing color. It is used auto / manually in the sedimentation feeding tank.

Sodium Hypochlorite:
Function: It is used to kill the harmful bacteria. It is used in the biological oxidation tank.

Product Quality Checked:
  1. Biological Oxygen Demand (BOD)
  2. Chemical Oxygen Demand (COD)
  3. Total suspended solids
  4. Total dissolved solids
  5. Color
  6. pH etc. 
Waste Water Treatment Plant Standard:

No
Parameter
Unit
Concentration Present
Department of environment Government of Bangladesh
Inlet
Outlet
1
BOD
PPM
281
23
50
2
COD
PPM
730
56
200
3
TDS
PPM
3220
1580
2100
4
TSS
PPM
204
36
150
5
EC
µδ/cm
6430
3160
1200
6
DO
PPM
0.1
4.6
4.5-8
7
Chloride
PPM
-
>200
600
8
Phosphate
PPM
2.6
2.2
8
9
Nitrate
PPM
0.9
0.06
10
10
Ammonium
PPM
0.09
0.07
5
11
Sulphate
PPM
-
27
-
12
Arsenic
PPM
-
-
0.2
13
Cyanide
PPM
-
-
-
14
Nitrate
PPM
0.08
0.05
50
15
Cobalt
PPM
-
-
-
16
PH
-
10.3
8.1
6-9
17
Temperature
ºC
40
38
40 Summer or 45 Winter
18
Cadmium
PPM
-
-
0.05
19
Chromium
PPM
-
-
0.05
 

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