UTILIZATION OF EFFLUENT FROM POTATO PROCESSING PLANT FOR BIOGAS PRODUCTION
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Date
2017
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COLLEGE OF FOOD PROCESSING TECHNOLOGY & BIO ENERGY ANAND AGRICULTURAL UNIVERSITY ANAND
Abstract
Biogas is a renewable and sustainable secondary energy source generated via biochemical conversion of biomass by a well-known process designated by anaerobic digestion. It provides an alternate source of energy for cooking and lighting in rural areas and manure in the form of biogas spent slurry. The present investigation entitled “Utilization of effluent from potato processing plant for biogas production” was conducted with a aim of characterizing the effluent from potato processing plant and optimizing the process parameters for biogas production from the effluent of potato processing plant. In this study, anaerobic co-digestion of cattle dung (CD) and potato effluent (PE) was evaluated to determine the suitable parameters in terms of biogas and methane (CH4) productions. Batch lab-scale anaerobic co-digestion of CD with PE was conducted at three different total solids (8%, 12% and 16%), three temperature levels (25ºC, 35 ºC and 45ºC), three mixing ratios (80:20, 60:40, 40:60) at 10, 30 and 50 days HRT in order to obtain maximum biogas yield and methane content. Optimum biogas production parameters from effluent of potato processing plant were determined by Central composite design. The physico-chemical characteristics of the potato processing effluent were determined which had a pH of 7.3, total solids of 16.52%, volatile solids of 43.10%, carbon content of 25%, nitrogen of 0.72%, which had an C:N ratio of 34.44 and starch of 10.12 %. The highest biogas yield was obtained was 3110 ml at 12% total solids 45 ºC temperature, 40:60 co-digestion ratio after 10 days. The highest methane content was found to be 59.67% for the above mentioned treatment only. Optimized condition for biogas production parameters based on the maximum biogas yield and maximum methane content was found out to be at 12% total solids, 45ºC temperature, 40:60 co-digestion ratio and 10 days HRT. Based on test results the
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optimum mixing ratio depends on temperature. The slurry was analyzed for its total solids, volatile solids and NPK content and reducing sugar content after 10, 30 and 50 days retention period. The optimized solution had a total reduction of total solids from 12% to 4.21% and the VS were reduced to 17.42% and the reducing sugar content to 0.75%. The NPK values of the optimized digested slurry were also analyzed after 50 days retention period and were found to be 1.99%, 0.69% and 0.79%. The C:N ratio was reduced to 5.34.
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