机构地区:[1]上海电力大学环境与化学工程学院,上海200090 [2]上海市政工程设计研究总院<集团>有限公司,上海200092
出 处:《净水技术》2025年第3期96-105,共10页Water Purification Technology
基 金:上海市科委“科技创新行动计划”(22dz1209206)。
摘 要:【目的】探究聚丙烯酰胺(PAM)与不同无机调理剂复配对填埋污泥的脱水性能、流变特性以及胞外聚合物(EPS)分布特征的影响,以期为填埋污泥脱水处理提供更有效的调理方案。【方法】研究采用PAM与FeCl_(3)、PAM与Al_(2)(SO_(4))_(3)、PAM与CaO等3种脱水调理方案对填埋污泥进行化学调理,测定调理后污泥的比阻(SRF)、毛细吸水时间、流变特性、粒径分布、Zeta电位、EPS以及污泥压滤后的泥饼含水率,综合评估调理效果及其对污泥脱水性能的影响。【结果】当混凝剂为Al_(2)(SO_(4))_(3)时,污泥的SRF在投加量为80 mg/(g DS)时最小,为3.88×10^(7) s^(2)/g。基于流变特性分析,3种调理污泥的极限黏度顺序为:CaO>FeCl_(3)>Al_(2)(SO_(4))_(3),填埋污泥储能模量和损耗模量的差距则呈现FeCl_(3)>Al_(2)(SO_(4))_(3)>CaO的特点,当混凝剂投加量较大时,CaO调理下填埋污泥的储能模量明显高于FeCl_(3)和Al2(SO4)。在不同混凝剂投加量下,调理后填埋污泥中的蛋白质含量均呈现FeCl_(3)<CaO<Al_(2)(SO_(4))_(3)的特点。【结论】3种脱水调理方案对填埋污泥进行预处理后均能在一定程度上改善污泥的脱水性能。FeCl_(3)和Al_(2)(SO_(4))_(3)通过改善填埋污泥的流动性和黏度,显著提高其脱水性能;而CaO则主要通过增加填埋污泥粒径,从而提升其脱水效果。若从填埋污泥的混凝脱水效果角度考虑,FeCl_(3)作为混凝剂较佳。若考虑填埋污泥的传输和能耗等方面,CaO作为混凝剂更为适宜。鉴于填埋污泥中蛋白质含量较高,填埋污泥的脱水调理优选铁盐。[Objective]This study aims to investigate the effects of the combination of polyacrylamide(PAM)and various inorganic conditioners on dewatering performance,rheological properties and extracellular polymeric substances(EPS)distribution of landfilled sludge,with the goal of providing a more effective conditioning solution for landfilled sludge dewatering.[Methods]The study employed three dewatering conditioning schemes:PAM with FeCl_(3),PAM with Al_(2)(SO_(4))_(3),and PAM with CaO,to chemically condition the landfilled sludge.The specific resistance(SRF),capillary suction time,rheological properties,particle size distribution,Zeta potential,EPS,and cake moisture content after filtration of the conditioned sludge were measured to comprehensively evaluate the conditioning effects and their impact on dewatering performance of sludge.[Results]When Al_(2)(SO_(4))_(3) was used as the coagulant,the SRF of the sludge reached its minimum value(3.88×10^(7) s^(2)/g)at a dosage of 80 mg/(g DS).Based on the analysis of rheological properties,the limiting viscosity of the three conditioned sludges followed the order:CaO>FeCl_(3)>Al_(2)(SO_(4))_(3),while the energy storage modulus and loss modulus of the landfilled sludge exhibited a trend of FeCl_(3)>Al_(2)(SO_(4))_(3)>CaO.When the coagulant dosage was high,the storage modulus of the landfilled sludge conditioned with CaO was significantly higher than that conditioned with FeCl_(3) and Al2(SO4).The protein content in the conditioned sludge under different coagulant dosages followed the trend of FeCl_(3)<CaO<Al_(2)(SO_(4))_(3).[Conclusion]All three dewatering conditioning schemes are able to improve the dewatering performance of the landfilled sludge to some extent after pre-treatment.FeCl_(3) and Al_(2)(SO_(4))_(3) significantly enhance the dewatering performance by improving the flowability and viscosity of the sludge,while CaO mainly improve the dewatering effect by increasing the particle size of the sludge.From the perspective of coagulation-dewatering performance,FeCl_(3)
关 键 词:填埋污泥 药剂调理 污泥脱水性能 流变特性 胞外聚合物(EPS)
分 类 号:X703[环境科学与工程—环境工程]
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