生物淋滤中硫粉对污泥EPS组分和脱水性的影响

为探讨生物淋滤过程中污泥的脱水性能及其与胞外聚合物（EPS）中蛋白质（PN）、多糖（PS）的关系，以硫粉（S⁰）作为底物，设计了不同S⁰投量（0，2，4，6，8g/L）+10%接种物的实验组进行10d淋滤实验.结果表明：溶解态PN、PS含量和污泥比阻（SRF）在淋滤0~2d降低，之后呈上升趋势，结合态PN、PS含量在淋滤0~8d呈下降趋势，之后略微上升，且S⁰投加量越大，上述变化趋势越明显.统计结果发现，SRF与溶解态PN、PS有显著的正相关性（R=0.861、0.875，P<0.01）.说明不同S⁰投加量导致溶解态PN、PS含量变化从而影响了污泥脱水性能，其中溶解态PS的变化对污泥脱水性能作用更大.S⁰投量为8g/L、淋滤时间为2d时，污泥脱水效果最佳，S⁰投量为2g/L、淋滤时间6d效果次之，SRF分别比原污泥降低58%和54%，又由于后者重金属去除率高于前者，推荐S⁰ 2g/L，温度30℃，淋滤时间6d，pH值降至2.66为最适工艺条件.

Effect of S0 on fractions of EPS in sludge and dewaterability by bioleaching

To investigate the dewaterability of sludge and its relationship with protein (PN), polysaccharide (PS) of extracellular polymers (EPS) in sludge bioleaching, S⁰was added as substrate with different dosage of S⁰ (0g/L, 2g/L, 4g/L, 6g/L, 8g/L) +10% inoculum for 10 days. Results showed that dissolved PS, PN and sludge specific resistance (SRF) reduced at 0~2days, but increased later, while the bound PN and PS decreased during 0~8d of bioleaching, and slightly increased later. Moreover, the above trend increased with the increasing loadings of S⁰. Statistical results showed that the SRF and dissolved PN, PS had a significantly positive correlation (R=0.861, 0.875, P<0.01), suggesting that the content of dissolved PN and PS were influenced by S⁰, thus affecting the dewatering performance of sludge, in which, the dissolved PS had more effect on the dewatering of sludge. The best bioleaching process for sludge dewatering performance was 8g/L of S⁰ for 2days, followed by 2g/L of S⁰ for 6days. with the SRF 58% and 54% lower than that of the original sludge, respectively. The heavy metal removal rate in the latter case was higher, thus the latter with 30℃, pH dropped to 2.66 was recommended as the optimization conditions.