Gundupalli, M P and Katam, Keerthi and Bhattacharyya, Debraj
(2017)
Treatment of sugarmill effluent and simultaneous production of ethanol: Effect of pH and quantity of seed sludge.
In: Intern ational Conference on Biotechnology & Bioengineering - Trends.
(Submitted)
Abstract
India is the largest producer of sugar and generates 0.16
–
0.76 m
3
of wastewater for every ton of
crushed
cane. In this paper, the effect of pH and seed sludge on simultaneous treatment and ethanol
production from
a
sugar mill wastewater using anaerobic sludge was investigated.
The
sugar mill
wastewater
had following composition:
pH (6.69
±0.45
), reducing sug
ar (5
–
6.83
m
g/mL),
chemical oxygen demand (5000
–
8
000 mg/L), total nitrogen (
22.73
–
22.97
mg/L),
and
NPOC
(1589
–
1647 mg/L). Seed sludge (10
–
50 % v/v) and pH (4
-
5.5) were varied in this study. Organic
carbon removal was determined by analyzing non
-
purgeable organic carbon (NPOC) in a TOC
liquid analyzer. Fermentation process was carried out for 24, 48, 72, 96 and 120 h. Maximum
ethanol yield of 0.00133 L/L of sugarcane wastewater was obtained at pH of 5.5 using 10 %
v/v
seed sludge. Moreover, 46
%
NPOC removal was achieved under this condition. India produces
900000 m
3
of sugarcane wastewater annually.
According to
the present study, it is possible to
produce 11
84
m
3
of ethanol per year from sugarcane wastewater by treating the wastewater in
anaerob
ic reactor under an acidic condition. However, detailed pilot study is required to determine
the economic and technical feasibility.
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