Page 69 - BCML AR 2019-20

STANDARD PARAMETERS OF TREATED EFFLUENT WATER
Parameters Standard norms Inland surface water Land for irrigation
pH 5.5 to 8.5 3.5 to 8.5 5.5 to 8.5
Total dissolved solids < 2100 – – – – – –
Total suspended solids < 30 < 30 < 100
Chemical oxygen < 250 < 250 – – –
demand (COD)
Biological oxygen < 100 < 30 < 100
demand (BOD)
Oil & grease < 10 < 10 < 10

BCML and its effluent treatment initiatives
The Company was among the first in Uttar new boilers in 2016-17 and 2019-20. The fly
Pradesh to install incinerators in distilleries for ash generated from incineration boiler is
H225 crore in 2015-16. Spent wash generated rich in potash. The Company has installed
during distillation process of ethanol is the granulation plant in its distillery units to
concentrated in multiple effect evaporators produce granules distributed as fertiliser to
(MEE), it is called slop and this slop is used as farmers at subsidised rates. After taking all
a fuel along with bagasse in the incineration measures, the Company sealed all outgoing
boiler. Condensate water of spent wash drains from its manufacturing units ensuring
MEE is treated in a condensate polishing zero liquid discharge.
unit (CPU) to reuse and achieve zero liquid
discharge. The Company has invested in

General parameters of raw effluent water generated in sugar industry

350 to 1500 to
4.0. to
6.5 600 3000
mg/lt mg/lt

pH Biological oxygen demand Total Dissolved Solids
(BOD) (TDS)

800 to 600 to 10 to
1500 900 50
mg/lt
mg/lt mg/lt

Chemical oxygen demand Total suspended solids Oil and grease
(COD) (TSS)

Annual Report 2019-20 | 67