Assessment of the possibility of decentralized domestic wastewater treament by multiple soil layering technique

Abstract

Soil is a natural material performing a good ability in removing polutants in water. Therefore, using soil materials are able to purify water environment. The present study aims to investigate treatment of decentralized domestic wastewater using Multiple soil layering/MSL technique. Both experiments of
pilot and in-site were carried, the results shows that effluent wastewater meets requirement of discharge into drainage chanel (QCVN 14-MT:2008/BTNMT). Using MSL technique significantly reduces BOD5 và COD parametters in wastewater. Besides that, this technique is vevy effective in removing phosphorous in wastewater (80- 85%) due to surface absorption on geothite mineral and Fe and Al complex. N- NH4 + was also treated with efficence of 60-70% based on active machemism of aerobic and unaerobic organisms in soil. The MSL uses evironment friendly materials, saves enery to operation and requires low costs that brings a benifit chance to apply to domestic waste water treatment.