Synchronous Municipal Sewerage-sludge
Stabilization
Author(s)
G. Bukuru, J. Yang & W. Min
Abstract
A study on a pilot plant accomplishing synchronous municipal sewerage-sludge
stabilization was conducted at a municipal sewerage treatment plant.
Stabilization of the sewerage and sludge is achieved in three-step process:
anaerobic reactor, roughing filter and a microbial-earthworm-ecofilter. The
integrated eco-filter utilizes an artificial ecosystem to degrade and stabilize the
sewerage and sludge. When the hydraulic retention time (HRT) of the anaerobic
reactor is 6h, the hydraulic load (HL) of the bio-filter is 16 m3/m2.d, the HL of
the eco-filter is 5 m3/m2.d, the recycle ratio of nitrified liquor is 1.5, and the
removal efficiency is 83-89% for CODcr, 94-96% for BOD5, 96-98% for SS, and
76-95% for NH3-N. The whole system realizes the zero emission of the primary
settling sludge, and has the characteristics of saving energy consumption and
operational costs.
Keywords: municipal sewerage, microorganisms, sludge, earthworms,
synchronous treatment.
1 Introduction
The main purpose of wastewater treatment is to remove solids and BOD
from the wastewater before the liquid effluent is released to a convenient,
near by body of water. What remains to be disposed of is a mixture of solids
and water, called sludge. The collection, processing, and disposal of sludge
can be the most costly and complex aspect of wastewater treatment. Many
developing countries can’t afford the cost of the sludge wasting line.
Therefore the aim of the research was to develop a system that can
simultaneously achieve wastewater and sludge stabilization using innovative and
clean technology that involves minimum capital expenditure.
Keywords
municipal sewerage, microorganisms, sludge, earthworms,
synchronous treatment.
Related Book
Other papers in this volume
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