DOMESTIC WASTE WATER TREATMENT BY BIO-FILTRATION: A CASE

Abstract: Water scarcity is worldwide problem. Water is vital for survival of living being. The reuse of domestic wastewater for non-potable water application is a potential solution for water deprived region world-wide. In recent days many developing nations cannot afford to construct and maintain costly wastewater treatment plants. They need more options for wastewater treatment at low cost. In both developed and developing nations, centralized sewage treatment system may not fulfill sustainable wastewater management requirements in future due to ever-increasing demand. Therefore in the present study an attempt is made to know the efficiency of vermifilter as decentralized treatment for parameters pH, total dissolved solids, removal of biological oxygen demand and chemical oxygen demand. In this study sewage water is treated using vermifilter containing earthworms and the results are compared with permissible standards of treated water. The average removal efficiencies of the vermifilter were as follows: chemical oxygen demand (COD) 68.52 %; biological oxygen demand (BOD) 72.05 %; total dissolved solids 15.42 %. During the process of vermifiltration, there was no sludge formation in the process and was also an odor-free process and the resulting vermifiltered water was clea