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- 氧化—絮凝调理对剩余污泥脱水性能的影响
- Effects of oxidation-flocculation conditioning on dewatering performance of activated sludge
- 夏加华， 饶汀， 季娟， 刘安康， 梁炎凯， 孙永军
- 土木与环境工程学报 2023年45卷第3期 页码：173-182
- DOI：10.11835/j.issn.2096-6717.2022.099 中图分类号：X703.1
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纸质出版日期：2023-06-25，
收稿日期：2022-08-01
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摘要
针对污水处理厂污泥脱水难度大、运行成本高等问题，深入研究NaClO投加量、污泥混合液pH值以及在NaClO最佳投加量和污泥混合液最佳pH值下耦合聚合硫酸铁（PFS）和三氯化铁（FeCl3）对污泥脱水性能的影响，以期获得氧化—絮凝调理对活性污泥脱水性能的影响机制。结果表明，在NaClO投加量为40 mg/g DS（绝干污泥）和污泥混合液pH值为3时，PFS耦合NaClO调理后的泥饼含水率和污泥比阻（Specific Cake Resistance，SRF）分别降至85.86%和4.74×1011 m/kg；FeCl3耦合NaClO调理后的泥饼含水率和污泥比阻分别降至86.36%和3.93×1011 m/kg。调理后的污泥絮体粒径D50的大小关系为：NaClO+PFS>NaClO+FeCl3>pH值>原泥>NaClO。显然，经过氧化—絮凝调理后的污泥絮体粒径明显增大，滤液中的有机质含量降低。氧化—絮凝调理可使活性污泥比阻显著降低，脱水性能显著改善。NaClO耦合PFS和NaClO耦合FeCl3有望成为高效环保、价格低廉的新型污泥脱水调理剂。
Abstract
In view of the difficulty of sludge dewatering and high operating cost in wastewater treatment plants, the effect of NaClO dosage, pH value of the sludge mixture, and the coupling of polymerized ferric sulfate (PFS)/ ferric chloride (FeCl3) under the optimal dosage of NaClO and the optimum pH value of the sludge mixture on the dewatering performance of sludge were studied in depth, in order to obtain the influence mechanism of oxidation-flocculation conditioning on the dewatering performance of activated sludge. The results showed that when the dosage of NaClO was 40 mg/g DS and pH value of the sludge mixture was 3, the moisture content of mud cake and sludge specific resistance (SRF) after PFS coupled NaClO conditioning were reduced to 85.86% and 4.74×1011 m/kg, respectively. The moisture content and sludge specific resistance of the mud cake after FeCl3 coupling NaClO conditioning were reduced to 86.36% and 3.93×1011 m/kg, respectively. The relationship of the conditioned sludge floc size D50 is: NaClO+PFS>NaClO+FeCl3>pH value >raw sludge>NaClO. Obviously, after oxidation-flocculation conditioning, the particle size of the sludge flocs increased significantly, and the organic matter content in the filtrate decreased. Oxidation-flocculation conditioning can significantly reduce SRF and improve the dewatering performance. NaClO coupled PFS and NaClO coupled FeCl3 are expected to be novel sludge dewatering conditioners with high efficiency, environmental protection and low price.
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