Performance Appraisal of Common Effluent Treatment Plant (CETP) at Badli

Abstract

There has been a phenomenal growth of industries in Delhi in the last 2-3 decades, with a sharp increase in the number of industrial units. According to the Ministry of Environment and Forests 15 CETP‟s were to be set up as per the directives issued by Supreme Court and further steps were to be taken by the Delhi government for expediting the construction and commissioning of CETP‟s. Provision of effluent treatment plants for individual industries especially in the small scale sector in the various industrial estates in Delhi to produce the effluent of desired quality before discharging the effluent is not feasible in the Indian context. In Delhi there are 13 CETP‟s but only 11 are in operating condition. Out of these 11 CETP‟s only one is based upon the biological treatment and rest of the CETP‟s are working on physio-chemical treatment, which is not efficient in the overall treatment of the industrial wastewater. In order to determine the performance of the CETP, study was carried out on Badli CETP located at north-west district of Delhi. Samples were collected from inlet and outlet of each units of the treatment plant on daily basis and pH, TDS, TSS, BOD, COD, heavy metals, oil and grease are measured. pH, TSS, BOD and COD measured at inlet and outlet of the treatment plant were varied from 5.5 to 7.8, 493 to 43 mg/l, 98 to 23 mg/l and 480 to 160 mg/l respectively. Results obtained were analysed and it was found that, at the inlet of the plant almost all the parameters were found exceeding the standard limits and at the outlet parameters were brought under limits before its disposal into drain.