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Improving primary sludge dewaterability by oxidative conditioning process with ferrous ion-activated peroxymonosulfate
Korean Journal of Chemical Engineering ( IF 2.7 ) Pub Date : 2020-08-20 , DOI: 10.1007/s11814-020-0517-2
Xu Zhou , Wenbiao Jin , Lan Wang , Wanqing Ding , Chuan Chen , Xijun Xu , Renjie Tu , Song-Fang Han , Xiaochi Feng , Duu-Jong Lee

Enhancement of sludge dewaterability is key for sludge management and disposal of wastewater treatment plants (WWTP). In this study, the Fe2+-peroxymonosulfate (PMS) conditioning approach was first used to oxidize the primary sludge from the primary sedimentation tank of a full scale WWTP. The combination of Fe2+ (0.05–0.5 g/g TSS) and PMS (0.05–0.5 g/g TSS) could significantly improve the dewaterability of primary sludge. The optimal addition amount of Fe2+ and PMS was 0.1 g/g TSS and 0.25 g/g TSS, respectively, under which the capillary suction time (CST) and specific resistance to filtration (SRF) of the sludge was reduced by 79% and 95%. The physicochemical properties (particle size, zeta potential, EPS composition) of the primary sludge before and after oxidative conditioning were measured. Results showed that sulfate radicals generated from Fe2+-PMS system effectively reduced organic matter in different EPS fractions, further destroying sludge floc cells. Then the bound water in the sludge flocs was released, thereby improving the sludge dewaterability. The microscopic morphology also indicated that the sludge flocs have a blocky structure with tight texture before conditioning. After conditioning, the sludge flocs become smaller, and many irregular pores are formed on the surface, which facilitates the passage of internal moisture. Economic analysis showed that Fe2++PMS conditioning is more economical than the traditional Fenton method.

中文翻译:

亚铁离子活化过硫酸盐氧化调理工艺提高初级污泥脱水能力

提高污泥脱水能力是污水处理厂 (WWTP) 污泥管理和处置的关键。在这项研究中,Fe2+-过硫酸盐 (PMS) 调节方法首先用于氧化来自全规模污水处理厂初级沉淀池的初级污泥。Fe2+ (0.05–0.5 g/g TSS) 和 PMS (0.05–0.5 g/g TSS) 的组合可以显着提高初级污泥的脱水能力。Fe2+和PMS的最佳添加量分别为0.1 g/g TSS和0.25 g/g TSS,在此条件下,污泥的毛细吸入时间(CST)和过滤比阻力(SRF)分别降低了79%和95 %。测量了氧化处理前后初级污泥的理化性质(粒径、zeta 电位、EPS 组成)。结果表明,Fe2+-PMS 系统产生的硫酸根有效减少了不同 EPS 组分中的有机物,进一步破坏了污泥絮体细胞。然后释放污泥絮体中的结合水,从而提高污泥的脱水能力。微观形态还表明,污泥絮凝体在调理前具有块状结构,质地紧密。调质后的污泥絮体变小,表面形成许多不规则的孔隙,有利于内部水分的通过。经济分析表明,Fe2++PMS调理比传统的Fenton方法更经济。从而提高污泥的脱水能力。微观形态还表明,污泥絮凝体在调理前具有块状结构,质地紧密。调质后的污泥絮体变小,表面形成许多不规则的孔隙,有利于内部水分的通过。经济分析表明,Fe2++PMS调理比传统的Fenton方法更经济。从而提高污泥的脱水能力。微观形态还表明,污泥絮凝体在调理前具有块状结构,质地紧密。调质后的污泥絮体变小,表面形成许多不规则的孔隙,有利于内部水分的通过。经济分析表明,Fe2++PMS调理比传统的Fenton方法更经济。
更新日期:2020-08-20
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