Abstract
DSW (Distillery Spent Wash) is superfluous residual liquid waste produced during the process of alcohol production. It is one of the most critical environmental issues which cause pollution. Despite strictness of standards imposed on effluent quality, partially or untreated effluent very often finds access to surface and groundwater. The distillery wastewater becomes a serious risk to the water quality in several regions around the globe. The ever-increasing generation of DSW lead to take an attempt to investigate a few aspects of anaerobic digestion of spent wash collected from a distillery. In the present study CSTR (Continuous Stirred Tank Reactor) was used at laboratory scale. The study was carried out to evaluate the performance of CSTR after the effective startup and the gradual increment in the OLR (Organic Loading Rate). The maximum methane gas (CH4) of 71.68 ml at the OLR of 1.0g of COD (Chemical Oxygen Demand)/L was observed. The optimum COD removal efficiency of the CSTR was 91% corresponding to OLR of 1g of COD/L. The pH ranges from 7.1-7.3 gave better performance and maximum stability of the process. By increasing the ORL, the VFA (Volatile Fatty Acids) content was also increased and reached to the 1.5g COD/L. However, the removal efficiency of TS (Total Solids) increased at an accelerated rate of OLR.
Highlights
DSW (Distillery Spent Wash) is superfluous residual liquid waste produced during the process of alcohol production
The CSTR was operated in the temperature range of 27380C and charged with 1 liter of mixture of water and fresh buffalo dung for a period of 28 days intended for inoculum acclimatization
The biogas generated form the CSTR was first accumulated in the gas measuring jar, which was working on the similar principle of the Sahito et al [16]
Summary
DSW (Distillery Spent Wash) is superfluous residual liquid waste produced during the process of alcohol production. It is one of the most critical environmental issues which cause pollution. DSW contains high concentration of organic compounds in the form of alcohol, which make it dangerous and source of water pollution It is acidic in nature with high concentrations of BOD, COD and mineral salt contents [8,9]. The CSTRs are the simplest form of sealed reactors with conventional digesters having facility of gas storage These reactors have revealed a great potential to remove COD from 80- 90% at 10-15 days of retention from the distillery effluent [10]. The biogas and digestate are two end products which are found during the anaerobic digestion carried out in the presence of different types of micro-organisms
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