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Performance of upflow anaerobic sludge blanket and upflow anaerobic hybrid reactor in treatment of distillery spentwash was investigated under similar operating conditions. The reactors were initially fed with distillery spentwash having an average COD concentration of 1,22,000 mg L -1 with a HRT of 10 days and their performance was evaluated by operating at various HRTs viz., 10, 8, 7, 6, 5 and 4 days. Among the various HRTs, six days HRT was found to be ideal for the maximum reductions of COD, BOD and TS by 63.26, 70.80 and 57.20% respectively at OLR of 19.75 kg COD m -3 day -1 with UASB and 70.60, 78.50 and 62.45% at OLR of 19.25 kg COD m -3 day -1 with UAHR. The biogas yield of 0.30 and 0.31 m 3 kg -1 COD removed was recorded in UASB and UAHR. Population of total anaerobic bacteria and methanogenic bacteria are also high in UAHR than in UASB. The study concludes that upflow anaerobic hybrid reactor is superior in reducing the pollution load of distillery spentwash as compared to UASB.Keywords: upflow anaerobic sludge blanket; UASB; upflow anaerobic hybrid reactor; UAHR; hydraulic retention time; biogas production; treatment of distillery spentwash.Reference to this paper should be made as follows: Selvamurugan, M., Doraisamy, P. and Maheswari, M. (2014) 'High-rate anaerobic treatment of distillery spentwash using UASB and UAHR', Int.

Performance of full-scale upflow anaerobic sludge blanket (UASB) reactors treating distillery spentwash was evaluated. The plant was designed to handle 650 m 3 day -1 of distillery spentwash having an average chemical oxygen demand (COD) concentration of 112,400 mg l -1 with a HRT of 6 days. In the plant, the pH level of the influent varied from 3.50 to 4.40 but the pH of the treated effluent stabilized to a range of 7.36 to 7.68 during the study period. The operation of the reactors during study period revealed the stable conditions of the reactors, which is evident from the low COD, biochemical oxygen demand (BOD) and total solids (TS) contents in treated effluent. In the plant, the COD, BOD 5 and TS removal efficiencies were stabilized to the range of 62. 19-66.59, 72.42-77.11, and 58.47-60.46%, respectively at an organic loading rate of 2.15-4.60 kg COD m -3 day -1 . The biogas production was stabilized to the range of 48,290-135,115 m 3 week -1 with 60% methane content. The total quantity of biogas produced ranged from 0.40 to 0.57, 1.04 to 1.71 and 0.40 to 0.56 m 3 kg -1 removals of COD, BOD and TS, respectively. This study concluded that the treatment of distillery spentwash using UASB reactors contributed significantly for pollution load reduction besides generating renewable in-house bio-energy.

JANSBiomethanated distillery spentwash and pressmud biocompost as sources of plant nutrients for groundnut (Arachis hypogaea L.) M. Selvamurugan*, P. Doraisamy and M. Maheswari Department of Environmental Sciences, Tamil Nadu Agricultural University, Coimbatore -641003 (Tamil Nadu), INDIA *Corresponding author. E-mail: muruganens@gmail.com Received:June 23, 2013; Revised received:August 1, 2013; Accepted:August 5, 2013 Abstract: A field experiment was conducted to study the impact of biomethanated distillery spentwash and pressmud biocompost in various proportions with inorganic fertilizers on yield attributes, yield, oil and protein content of groundnut at Research and Development Farm of M/s. Bhavani Distilleries and Chemicals Ltd., T.Pudur, Thimiri, Tamil Nadu. Results of the field experiment revealed that yield and yield attributes viz., number of matured pods, 100 kernel weight and shelling percentage of groundnut were improved by the application of biomethanated distillery spentwash and pressmud biocompost compared to recommended NPK as chemical fertilizers. One-time presown application of BDS @ 100 m 3 ha -1 along with recommended NP in groundnut registered higher pod, grain and haulm yield of 1774, 1272 and 4668 kg ha -1 , respectively and the increase was to the tune of 35.83, 43.57 and 46.01 per cent, respectively over control. Similar to yield, BDS application increased the protein and oil content of groundnut kernels significantly. The net returns and benefit cost ratio of sugarcane were also as high as Rs.19,612 ha -1 and 1.90 for the treatment that received pre-sown application of BDS @ 100 m 3 ha -1 along with recommended NP as compared to control of Rs.19,612 ha -1 and 1.38, respectively. This concludes that the biomethanated distillery spentwash can be conveniently used as source of plant nutrients for groundnut.

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