【摘要】 为了考察几种典型脱水絮凝剂对各泥质类型底泥脱水性能的影响,对3条不同泥质类型的典型河流(沙质、泥沙混合质、泥质)底泥的脱水效果进行了研究。结果表明,在一定投加量范围内,所有脱水药剂均能不同程度改善各泥质类型底泥的脱水性能。无机絮凝剂建议选择PAFC(聚合氯化铝铁)或PAC(聚合氯化铝),其中PAFC的最佳投加范围为0.4%~1.6%,PAC的最佳投加范围为0.4%~2.0%;有机高分子絮凝剂建议选择CPAM(阳离子聚丙烯酰胺),最佳投加范围为0.01%~0.03%;在各絮凝剂最优投加条件下,泥质底泥的脱水性能提高最为明显,其比阻最大可下降86%,泥沙混合质底泥污泥比阻最大可下降81%,沙质底泥污泥比阻则最大可下降58%。而当复合混凝剂为PAC和CPAM或PAFC和CPAM时,沙质底泥在优化混凝条件下其污泥比阻最大可分别下降82%和76%。更多还原

【Abstract】 In this study,the sediments from three typical types of rivers( sandy,mud mixed with sandy,muddy) in Shandong Province were selected as the research objects. The impacts of typical dewatering reagents with different dosages on the dewatering performance of three sediments were investigated using sludge specific resistance. The experimental results indicated that in a certain dosage range,all dehydration reagents can improve the dehydration performance of all types of sediment in different degrees. The inorganic flocculants of PAFC( polymeric aluminum ferric chloride) or PAC( polyaluminium chloride) were recommended,and their optimum dosages of PAFC were 0. 4% —1. 6% and 0. 4% —2. 0%,respectively. The recommended organic flocculant was CPAM,and its optimum dosage was 0. 01% —0. 03%. Under the optimum flocculant dosing conditions,the sludge specific resistance of sandy sediment,mud mixed with sandy sediment and muddy sediment decreased by 58%,81% and 86%,respectively. However,under the optimum coagulation conditions for the complex flocculants of PAC-CPAM and PAFC-CPAM,the sludge specific resistance of sandy sediment decreased by 82% and 76%,respectively.更多还原