Volume No. 6 Issue No.: 4 Page No.: 1094-1108 April-June 2012




Shashidhar* and Gowri Shanker M.

Water and Environmental Engineering Division, Department of Civil Engineering National Institute of Technology ,Warangal, Andhra Pradesh (INDIA)


Received on : March 10, 2012




A study has been carried out to assess the amount of organic waste generated from the NITW campus. The potential of mesophilic anaerobic digestion for the treatment of kitchen waste along with sludge from wastewater treatment plant in a co-digestion process has been experimented under batch and continuous modes. During the experimentation various parameters were temporally analysed such as pH, biogas production, alkalinity, total solids, volatile solids, chemical oxygen demand (COD). The total estimated amount of dry wt. of organic waste produced in the campus is 310 kg/day. The volume of methane gas produced in 28days per kg of dry weight of kitchen,co-digestion and sludge waste by batch studies are 2085, 5452 and 6763 ml respectively. The gas produced by co-digestion was 23% more than the gas generated by the equivalent weight of kitchen and sludge produced individually.COD reduction was 34 %, 36 % and 33 %, Total Solids reduction was 42%, 50% and 44% and Total Volatile Solids reduction was 59%, 64% and 83% respectively for kitchen, co-digestion and sludge waste. Continuous studies for the treatment of kitchen, co-digestion and sludge with 20, 15 and 10 days of HRT were conducted. The biogas production of 8.5, 6.5 and 7 ml for kitchen waste, 22.5, 20, 19 ml for co-digestion of kitchen and sludge and 48, 53.5, 44.5 ml for sludge waste were observed respectively for HRTíS 20, 15 and 10 days. Kitchen waste and co-digestion gave maximum gas production at 20 days HRT, whereas sludge waste at 15 day HRT.


Keywords : Anaerobic digestion, Co-digestion, Batch studies, Continuous studies, Mesophilic temperature