Chemically Enhanced Primary Wastewater Treatment (CEPT) in Conjunction with H₂O₂/UV Technology in Controlled Atmosphere

摘要

The contrast of decrease in fresh water supply and an increasing demand for multiple uses of water has adversely affected the quality of waste water. Water-borne illnesses caused by the addition of agricultural and industrial chemicals, by-product wastes and sewage in water reservoirs, have become a serious problem to human health. Sustainable use of water resources, conservation and efficient treatment processes for the re-use of waste water are inevitable. The current study was designed to find the degree of deterioration of water and to formulate the cost-effective technique or method for waste water treatment. Chemically Enhanced Primary Treatment (CEPT) with alum in conjunction with Advance Oxidation Process (AOPs) with H2O2/UV to meet specific objectives in municipal Waste Water Treatment (WWT) was evaluated. This study reports a reduction in COD (70%), BOD (58%) and Turbidity (81%) with an optimum dose of alum (14mg/L). Further degradation of such chemicals with 40% Waste Hydrogen Peroxide and Ultra Violet radiation (H₂O₂/UV) was also investigated. Reduction in COD (96%) and BOD (95%) of wastewater was observed in samples treated with an exposure to 3ml H₂O₂. Moreover, a 100% reduction in colony forming units (CFU/ml) of fecal coliform was observed after 90 min treatment with 3ml of 40% H₂O₂/L wastewater coupled with exposure to UV light. Use of wasted H₂O₂ is economical as compared to other chemical treatment methods besides reducing H₂O₂ pollution. Thus CEPT treatment along with H₂O₂UV exhibited a promising approach without causing any negative impact on the environment.