Comparison of reverse osmosis membrane fouling characteristics in full-scale leachate treatment systems with chemical coagulation and microfiltration pre-treatments

Author:

Rukapan Weerapong1,Khananthai Benyapa1,Srisukphun Thirdpong2,Chiemchaisri Wilai1,Chiemchaisri Chart1

Affiliation:

1. Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

2. Department of Environmental Health, Faculty of Public and Environmental Health, Huachiew Chalermprakiat University, Samutprakarn 10540, Thailand

Abstract

Fouling characteristics of reverse osmosis (RO) membrane with chemical coagulation and microfiltration (MF) pre-treatment were investigated at full-scale leachate treatment systems. In chemical coagulation pre-treatment, solid separation from stabilized leachate was performed by ferric chloride coagulation followed by sand filtration. Meanwhile, MF pre-treatment and the RO system utilized direct filtration using a 0.03 µm membrane without chemical addition. MF pre-treatment yielded better pollutant removals in terms of organics and nitrogen. The study on effect of pre-treatment on RO membrane fouling revealed that accumulated foulant on the RO membrane in MF pre-treatment was significantly lower than that of chemical coagulation. Nevertheless, NaOH cleaning of the fouled RO membrane after chemical coagulation pre-treatment could better recover its permeate flux, thus suggesting that the formation of a loose-structure cake layer by chemical coagulation pre-treatment could allow effective penetration of chemical cleaning and detachment of foulant layer from the membrane surface.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

Reference15 articles.

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