自生动态膜分离厌氧产酸污泥效果与特征研究

Efficiencies and characteristics of self-forming dynamic membrane in separating fermented sludge for acid production

采用自生生物动态膜(SFDM)分离高浓度发酵产酸污泥(非牛顿流体),研究了自生动态膜对发酵污泥中发酵底物的截留及挥发性脂肪酸(VFAs)的选择透过性效果,考察了自生生物动态膜阻力构成和膜污染层成分.结果表明:自生动态膜在运行3d后,出水悬浮性固体(SS)基本保持在1.5g/L以下,多糖截留率为40%,蛋白质截留率为75%;运行5d时,溶解性化学需氧量(SCOD)截留率稳定在45%左右,可以稳定截留分子量较大的物质;VFAs的截留率仅维持在3%左右,可以选择性透过动态膜.自生动态膜运行阻力主要来自动态膜层,粘附在膜面的胞外蛋白质是主要膜污染贡献物质.

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 efflciencies 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.