Gravity filtration performances of the bio-diatomite dynamic membrane reactor for slightly polluted surface water purification

Author:

Chu Huaqiang12,Dong Bingzhi2,Zhang Yalei2,Zhou Xuefei2

Affiliation:

1. School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

2. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China

Abstract

A bio-diatomite dynamic membrane (BDDM) reactor for surface water treatment under a water head of 30, 40, 50, 60 and 70 cm, respectively, was investigated, which was very effective for pollutants removal. The water head exerted strong influences on filtration flux of BDDM during the precoating process, as well as on the formation of BDDM and turbidity variations. A high filtration flux (approximately 200−300 L/m2 h) could be achieved in the long filtration times of BDDM with a stable effluent turbidity of approximately 0.11−0.25 NTU. The BDDM could remove particles larger than 25 μm completely. The adopted sintered diatomite mainly consisted of macro pores, which were beneficial for improving the filtration flux of BDDM. During the backwash stage, the BDDM could be removed completely by the air backwash.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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