BOD analysis of industrial effluents 5 days to 5 min英文电子书.pdf

Current Applied Physics 3 (2003) 191–194 /locate/cap BOD analysis of industrial effluents: 5 days to 5 min Shikha Rastogi a, Pratima Rathee a, T.K. Saxena , N.K. Mehra c, Rita Kumar a,* a Centre for Biochemical Technology, Delhi University Campus, Mall Road, Delhi 110 007, India National Physical Laboratory, Dr. K.S.Krishnan Marg, New Delhi 110 012, India c Department of Zoology, Delhi University, Delhi 110 007, India Abstract Wastewater generation and its subsequent treatment is a major problem for every industry and for the society as well. Prior to treatment, the wastewaters need to be monitored so as to permit their discharge into the local water resources. Amongst all the parameters for which the wastewaters are monitored, biochemical oxygen demand (BOD), is one of the most important and fre- quently used parameters for estimating the level of water pollution. The control of wastewater treatment plants is very difficult or even impossible using the classical determination method for BOD because of its high time consumption (3–5 days). The need for fast, portable and cost-effective methods for environmental monitoring has stimulated the production of a variety of field analytical tools such as biosensors. Biosensors are device that have several unique features such as compact size, simple to use, one step re- agentless analysis, low cost and quick-real time results. The conventional BOD measurement requires 3–5 days, which a microbial BOD biosensor senses within minutes. A number of microbial BOD sensors have been developed nationally and internationally. The drawback of such developed sensors is that they cannot be used for all types of industrial and domestic wastewaters.