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Efficiencies and characteristics of self-forming dynamic membrane in separating fermented sludge for acid production |
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Abstract Self-forming dynamic membrane (SFDM) was used to separate the high-concentration redusidal sludge (belong to non-newtonian fluid) with fermented for the production of volatile fatty acids (VFAs). The efficiencies of the retaining of substrates and selective transmission of the produced VFAs by SFDM were investigated. Characteristics of SFDM resistance and composition of the pollution layer were analyzed. Results indicated the suspend solid (SS) concentration in effluent of SFDM could be remained below 1.5g /L after operated for 3days, and the retention rates of polysaccharide and protein could reach about 40% and 75%, respectively. After operated for 5days, nutrients with large molecular could be retained and the retention rate of SCOD could stable at 45%. Moreover, the productd VFAs could be selectively discharged timely and the retention rate of VFAs were just about 3%. Resistance of SFDM was mainly from membrane surface, and the pollutants are primarily extracellular protein.
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Received: 25 October 2014
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