Experimental Research on Coagulation Performance of PAC-PDMDAAC Composite Flocculant in Treating the Pi River

PAC-PDMDAAC複合絮凝劑處理淠河水混凝性能研究

賈如升(RU SHENG JIA)

《台灣水利》 67卷3期 (2019/09) Pp. 67-73

摘要

Polyaluminum chloride (PAC) and polydimethyldiallylammonium chloride (PDMDAAC) were used as raw materials to prepare composite coagulant. The effects of PAC-PDMDAAC composite ratio, dosage of composite coagulant and pH value of water sample on turbidity and UV_(254) removal efficiency were investigated in this paper. The results showed that the turbidity of raw water was less than 10 NTU, the removal efficiency of turbidity and UV_(254) by PAC-PDMDAAC composite coagulant with a composite ratio of 30:1 and above had little difference, but the removal efficiency was obviously higher than that of PAC coagulant. With the increase of PAC-PDMDAAC composite coagulant dosage, the removal of UV_(254) and turbidity were improved. When ratio of PAC and PDMDAAC was 70:1, the dosage was 7 mg/L, the removal of UV_(254) and turbidity were the best. With the increase of pH value, the removal of the PAC-PDMDAAC composite coagulant for turbidity first increased and then decreased. Within the range of pH 7.0~7.5, the remaining turbidity was the lowest, and the removal reached 90.06%. The removal of UV_(254) showed a downward trend. When the pH value was 6, the removal was higher, reaching 58.64%. It indicated that PAC-PDMDAAC composite coagulant was more suitable for the removal of UV_(254) and turbidity in low turbidity water than that of PAC.

關鍵字

Low turbidity water body ； Enhanced coagulation ； PAC-PDMDAAC

並列摘要

以聚氯化鋁（PAC）和聚二甲基二烯丙基氯化銨（PDMDAAC）為原料制備了複合混凝劑，考察了PAC-PDMDAAC複合比、複合混凝劑用量和水樣pH值對濁度和UV_(254)去除效果的影響。實驗結果表明，原水濁度小于10 NTU，複合比為30:1及以上的PAC-PDMDAAC複合混凝劑對濁度和UV_(254)的去除率差異不大，但去除率明顯高于傳統混凝劑PAC。隨著PAC-PDMDDAAC複合混凝劑用量的增加，對UV_(254)和濁度的去除效果得到改善。當PAC和PDMDAAC的比例為70:1時，用量為7 mg/L，對UV_(254)和渾濁度的去除效果最好。隨著pH值的增加，PAC-PDMDDAAC複合混凝劑對濁度的去除率表現為先增加後降低的趨勢。在pH7.0～7.5範圍內，剩余濁度最低，去除率達到90.06%。對UV_(254)的去除呈下降趨勢。當pH 6時，去除率較高，達到58.64%。表明PAC-PDMDAAC複合混凝劑比PAC更適用于低濁度水中UV_(254)和濁度的去除。

並列關鍵字

低濁水體 ； 強化混凝 ； PAC-PDMDAAC