Greywater treatment by vermifilter: A low-cost option for rural sanitation in India
Journal Title: INTERNATIONAL JOURNAL OF RECENT TRENDS IN SCIENCE AND TECHNOLOGY - Year 2018, Vol 26, Issue 2
Abstract
Recycle and reuse are the best options to deal with water scarcity. An attempt is made to reuse greywater after giving low cost effective treatment with the help of vermifilter. Vermifilter is an emerging technology in which combined action of earthworm activity and the adsorption properties of material like soil, sand and gravel particles on the organic pollutants applied for greywater treatment. The present study addresses performance evaluation of a laboratory scale vegetated vermifilter system comprising of settling tank, sand-gravel filter (SGF), Laterite soil vegetated filter (LSVF) and laterite soil vegetated vermifilter(LSVVF) for the treatment of greywater. The sequential batch experiments were conducted in a pilot scale experimental set-up. The Organic loading rate (OLR) was varied from 20 to 140 kg BOD/ha/d and the hydraulic retention time (HRT) used was from 0.50,1,2 and 3 d. The BOD5 removal efficiency was found to be in the range 15–30%, 48–60 %, and 70-80 for 3 d HRT in SGF, LSVF and LSVVF respectively. The efficiency of the system for BOD5 removal was observed to be 75–85% at 3 d HRT. The effluent can be recycled and used for non-potable purposes in a household. The developed system is a potential option for the decentralized wastewater treatment in developing country like India.
Authors and Affiliations
Patil Y. M. , Munavalli G. R
Keywords
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