Synchronous municipal sewerage-sludge stabilization

Article type: Research Article

Authors: Bukuru, Godefroid | Yang, Jian

Affiliations: School of Environment Science and Engineering, Tongji University, Shanghai 200092, China

Note: [] Corresponding author. E-mail: gbukuru@caramail.com

Abstract: A study on a pilot plant accomplishing synchronous municipal sewerage-sludge stabilization was conducted at a municipal sewerage treatment plant. Stabilization of sewerage and sludge is achieved in three-step process: anaerobic reactor, roughing filter and a microbial-earthworm-ecofilter. The integrated ecofilter utilizes an artificial ecosystem to degrade and stabilize the sewerage and sludge. When the hydraulic retention time (HRT) of the anaerobic reactor is 6 h, the hydraulic load(HL) of the bio-filter is 16 m^3/(m^2· d), the HL of the eco-filter is 5 m^3/(m^2 ·d), the recycle ratio of nitrified liquor is 1.5, the removal efficiency is 83%–89% for COD_{Cr}, 94%–96% for BOD_5, 96%–98% for SS, and 76%–95% for NH_3-N. The whole system realizes the zero emission of sludge, and has the characteristics of saving energy consumption and operational costs.

Keywords: municipal sewerage, sludge microorganisms, earthworms, synchronous treatment

Journal: Journal of Environmental Sciences, vol. 17, no. 1, pp. 59-61, 2005