Anaerobic fluidized-bed membrane bioreactor with greywater for water reuse

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Anaerobic fluidized-bed membrane bioreactor with greywater for water reuse

 

Author: Tang, Lu
Title: Anaerobic fluidized-bed membrane bioreactor with greywater for water reuse
Degree: M.Sc.
Year: 2015
Subject: Sewage -- Purification -- Anaerobic treatment.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Environmental Engineering
Pages: ix, 30 pages : illustrations (some color)
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2818319
URI: http://theses.lib.polyu.edu.hk/handle/200/8065
Abstract: Today, water shortage, energy security, and climate change are three of the most significant global issues that need to be addressed. In order to solve these issues, anaerobic treatment with greywater for water reuse, energy recovery, and reduction of carbon emission has been proposed. Although anaerobic treatment with greywater has shown its promising potential to solve these issues, the bottleneck of this process is poor degradability of anionic surfactants significantly containing in greywater. The objective of this paper was to study the removal/adsorption performance of a common anionic surfactant, sodium dodecyl sulfate (SDS), existing in greywater with anaerobic treatment process. This process is called anaerobic fluidized bed membrane bioreactor (AFMBR) with granular activated carbon (GAC) inside the reactor. In this study, GAC was used as fluidized medium to support biological growth. The performance of AFMBR and adsorption capacity of GAC was studied. GAC adsorption capacity was tested onto both SDS and glycerol. GAC adsorption capacity onto SDS can reach 55 mg g⁻¹, while for glycerol it can only reach 3.5 mg g⁻¹ which can be negligible in the reactor. Total COD and SDS concentration was measured from permeate effluent daily and twice a week, providing a removal efficiency of 91% and 98%, respectively. In all those removed SDS concentration, 20% were degraded by biological anaerobically, 80% of total removed SDS were adsorbed by GAC and almost 98% of removed glycerol were biodegraded, just 2% of removed glycerol can be adsorbed by GAC. In this lab-scale treatment, effluent COD and SDS concentration was really low, at a value of 25±5 mg g⁻¹ and lower than 2 mg g⁻¹, respectively. Greywater can be reused in many ways, such as toilet flushing in coastal city, car washing, irrigation and even for drinking. We envision that this AFMBR within GAC process could serve as a cost-efficient method on anionic surfactants removal as a treatment of anaerobically-treated greywater for reuse.

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