Table 8.1 (continued)
Unit operation
Characteristic
of wastewater
Concentration
(mg/L)
Total
effluents
(kg/L)
References
Reforming
Suspended
solids
50
0.01–0.14
Speight (2014), Central
Pollution Control Board,
India (2018), International
Petroleum Industry Environmental Conservation
Association (2010), and
Malakar et al. (2015)
Oily water
150
Spent catalyst
50
Chemical oxygen demand
600–1200
Solvent
extraction/
dewaxing/propane ee
deasphalting
Furfural
1–5
0.01–0.35
Central Pollution Control
Board, India (2018), International Petroleum Industry Environmental
Conservation Association
(2010), and Malakar et al.
(2015)
Phenol
1–10
Toluene
1–3
Methyl-ethylketone
1–3
Asphalted
propane
4–8
n-hexane
1.8–1.85
Sulphur recovery unit
Amines
<100
0.0001–0.03
World Bank Group,
United States (1998) and
Malakar et al. (2015)
Sulphur
compounds
<10
Ammonia
<100
Suspended
solids
<10
Free
hydrocarbons
<10
Heat
exchanger
Oily sludge
100
–
Central Pollution Control
Board, India (2018)
Cooling tower Oily sour water 5–100
0.00001–0.01 Central Pollution Control
Board, India (2018), International Petroleum Industry Environmental
Conservation Association
(2010), and Patwardhan
(2008)
Chemical oxygen demand
150
Suspended
solids
200
Dissolved
solids
700
Heavy metals
1–100
Blow-down
Sulphur
compounds
50–100
0.0016–0.01
Central Pollution Control
Board, India (2018), International Petroleum Industry Environmental
Conservation Association
(2010), and Patwardhan
(2008)
Organometallic 10–40
Compounds
10–40
Organic
nitrogen
1–10
238
M. Samanta and D. Mitra