Journal of Food, Agriculture and Environment

Enhanced performance of dyeing wastewater reclamation by PAC addition in a membrane bioreactor

Author(s):

Fang Fang ^{1, 2}, Jia-shun Cao ^{1, 2}, Li-na Chen ³, Li Chen ¹, Qian Feng ^{1, 2}*, Hui-lian Xu ⁴

Recieved Date: 2012-02-08, Accepted Date: 2012-04-28

Abstract:

Powdered activated carbons (PAC) have been specifically developed for the removal of organic contaminants from wastewaters. However, the researches on reclaiming secondary effluent of dyeing wastewater from membrane bioreactors (MBR) are scarce. Therefore, the performances of a pilot-scale MBR with and without PAC for dyeing wastewater treatment were investigated in this work. After addition of PAC, the performance of MBR was improved by 12%, 5% and 11% for COD, color and NH4+ removal, respectively, compared with the removals of 41±8%, 30±5% and 35±6%, respectively, for COD, color and NH₄⁺ removal without PAC addition. The strong adsorption characteristic of PAC was found to be responsible for the better performance of pollutant removal, which increased the pollutant and biomass retention in PAC-MBR. The trans-membrane pressures (TMP) increased steadily and peaked at 0.016 MPa on the 6^th day without PAC, while it increased and peaked at 0.015 MPa on the 10^th day with PAC addition. The TMP increased slowly when PAC was added into the MBR, because part of foulant was attached on PAC surface, which led to less foulant on membrane. The inorganic foulant of membrane was analyzed through inorganic element analysis, demonstrating that inorganic foulant was mainly resulted from Si, Al, Ca and Fe elements through chemical and biological precipitation. Our work suggested that inorganic elements should be considered for fully understanding of membrane fouling mechanism. 

Keywords:

Dyeing wastewater, membrane bioreactor (MBR), membrane fouling, powdered activated carbon (PAC), transmembrane pressure (TMP)

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Environment
Pages: 1138-1141

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