聚季铵盐调理污泥深度脱水过程与中试效能

doi:10.16085/j.issn.1000-6613.2018-1944

摘要/Abstract

摘要：

采用聚季铵盐[P(DM-AM)]取代传统化学调理剂聚丙烯酰胺（polyacrylamide，PAM），通过分析污泥脱水性能、胞外聚合物含量以及抽滤液水质指标，验证P(DM-AM)作为污泥调理剂的效果。结果表明，P(DM-AM)作为阳离子型高分子絮凝剂能够提高污泥的脱水性能，在最适投加量为0.4%～0.5%（按污泥干固量计算）时，毛细吸水时间（capillary absorption time，CST）和污泥比阻（specific resistance of sludge，SRF）分别下降48%和40%，污泥热值可达2686cal/g（1cal=4.18J）。当P(DM-AM)协同生石灰（CaO）和氯化铁（FeCl₃）作为调理剂调理污泥时，处理后的污泥水分去除率可升高55%左右，与污泥紧密结合型胞外聚合物（tightly bound-EPS，TB-EPS）中的多糖含量降低了74%，且污泥中Cl^-浓度约为92.3mg/gDS，较采用PAM调理的污泥下降约6%，可缓解污泥焚烧对焚烧炉腐蚀的影响。同时，P(DM-AM)调理污泥后，其抽滤液化学需氧量（chemical oxygen demand，COD）由2120mg/L降低至1941.8mg/L，可有效减轻污水处理厂运行负担。

关键词: 聚季铵盐, 聚合物, 过滤, 胞外聚合物, 废物处理, 中试效能

Abstract:

Polyquaternary ammonium [P(DM-AM)] was employed to substitute traditional sludge dewatering agent polyacrylamide (PAM) in this study. The property of P(DM-AM) was verified by analyzing the dewatering performance, extracellular polymeric substances content, and filtrate quality. The results showed that P(DM-AM), as a cationic macromolecular flocculant, can improve the dewatering performance of sludge. When the dosage was 0.4%—0.5% (calculated according to the dry solids of sludge), capillary absorption time (CST) and specific resistance of sludge (SRF) decreased by 48% and 40%, respectively, and the thermal value of sludge could reach 2686cal/g. When CaO and FeCl₃ as sludge conditioners collaborated with P(DM-AM), sludge moisture removal rate increased by about 55% and the polysaccharides content in tightly bound-EPS (TB-EPS) was reduced by 74%. The Cl^- concentration in the sludge was 92.3mg/gDS, reduced by 6% compared with traditional PAM, which can relieve the influence of sludge incineration ash on incinerator. The chemical oxygen demand (COD) of the filtrate was reduced from 2120mg/L to 1941.8mg/L, which was conducive to the operation of wastewater treatment plant.

Key words: polyquaternary ammonium, polymers, filtration, extracellular polymeric substances (EPS), waste treatment, pilot-scale efficiency

中图分类号:

X703

王子文, 曹蓉, 杨艳坤, 朱引, 王硕, 李激. 聚季铵盐调理污泥深度脱水过程与中试效能[J]. 化工进展, 2019, 38(07): 3458-3464.

Ziwen WANG, Rong CAO, Yankun YANG, Yin ZHU, Shuo WANG, Ji LI. Performance and pilot-scale efficiency of polyquaternary ammonium in sludge deep dewatering process[J]. Chemical Industry and Engineering Progress, 2019, 38(07): 3458-3464.

图/表 13

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编号	Cl^-浓度/mg·(gDS)^-1
R0	52.5
R1	56.1
R2	60.7
R3	63.3
R4	92.3
R5	97.9

编号	Cl^-浓度/mg·(gDS)^-1
R0	52.5
R1	56.1
R2	60.7
R3	63.3
R4	92.3
R5	97.9

编号	TP/mg·L^-1	COD/mg·L^-1	Cl^-浓度/mg·L^-1
原污泥抽滤液	0	125	2120
JAY投加量0.4%	0.4	130	1941.8
JAY+CaO+FeCl₃	0	370	3381.2
PAM+CaO+FeCl₃	0	440	3744.4

编号	TP/mg·L^-1	COD/mg·L^-1	Cl^-浓度/mg·L^-1
原污泥抽滤液	0	125	2120
JAY投加量0.4%	0.4	130	1941.8
JAY+CaO+FeCl₃	0	370	3381.2
PAM+CaO+FeCl₃	0	440	3744.4

编号	含水率/%	有机物含量/mg·L^-1	热值/cal·g^-1	COD/mg·L^-1
原污泥	85.67	52.40	2738	360
JAY+石灰+FeCl₃	58.83	50.42	2544	900
PAM+石灰+ FeCl₃	58.74	50.34	2531	1500