Comparison between treatment of kitchen-sink wastewater and a mixture of kitchen-sink and washing machine wastewater

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Document Type

Article

Source Title

Environmental Technology

Volume

30

Issue

1

First Page

111

Last Page

117

Publication Date

1-2009

Abstract

In this paper, a submerged membrane bioreactor was used to treat ‘higher‐load’ grey water: a) kitchen‐sink wastewater only, and b) a mixture of kitchen‐sink wastewater and washing‐machine wastewater. For each type of wastewater, three systems operated at different hydraulic retention times (HRTs) were investigated. In the mixture of kitchen‐sink wastewater and washing‐machine wastewater, the reactor with a short HRT of four hours was stopped due to foaming. It has been observed that for both types of wastewater, an HRT of eight hours or longer can be used for the treatment. However, it has been observed that a higher COD in the permeate of the mixture can be obtained compared with that of the kitchen‐sink wastewater only. This indicated that washing‐machine wastewater has some component that is not easily biodegradable. The total linear akylbenzene sulfonate (LAS) removal was > 99% even at a concentration of 10–23 mg l−1.

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Disciplines

Chemical Engineering

Keywords

Sewage—Purification; Bioreactors

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