Biological Remediation of Parboiled Rice Mill Wastewater Using UASB
Author : Bhushan R Ambade and Charwak B Ambade
Abstract :
Rice is one of the popular foods in India. Rice is produced by milling paddy in rice mills. The paddy is partially boiled to reduce the fats and to make it delicious. Water is used for partial boiling of paddy that generates wastewater. The wastewater is acidic, high BOD and COD contents and COD/BOD ratio ranges as 1.68 to 1.76. Thus anaerobic treatment shall be used to treat this wastewater. The UASB pilot plant is installed at rice mill and the treatment is monitored for 21 days. The COD removal is achieved up to 70.37% and the gas production is in the range of 0.47 to 0.64 cu m/kg of COD removal. UASB system is found great potential to remove the pollutants. The plant require small land, easy to construct, less capital and maintenance cost and high rate of anaerobic treatment. Effluent is odourless and contents less organic matters hence can be used for irrigation purpose after aerobic treatment. Therefore, this process shall be effectively used to treat the parboiled rice mill wastewater.
Keywords :
Parboiled rice mill, wastewater, anaerobic treatment, pilot plant, biogas
