- 氧化—絮凝調(diào)理對剩余污泥脫水性能的影響
- Effects of oxidation-flocculation conditioning on dewatering performance of activated sludge
- 夏加華， 饒汀， 季娟， 劉安康， 梁炎凱， 孫永軍
- 土木與環(huán)境工程學(xué)報 2023年45卷第3期 頁碼：173-182
- DOI：10.11835/j.issn.2096-6717.2022.099 中圖分類號：X703.1
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紙質(zhì)出版日期：2023-06-25，
收稿日期：2022-08-01
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摘要
針對污水處理廠污泥脫水難度大、運行成本高等問題，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值下耦合聚合硫酸鐵（PFS）和三氯化鐵（FeCl3）對污泥脫水性能的影響，以期獲得氧化—絮凝調(diào)理對活性污泥脫水性能的影響機制。結(jié)果表明，在NaClO投加量為40 mg/g DS（絕干污泥）和污泥混合液pH值為3時，PFS耦合NaClO調(diào)理后的泥餅含水率和污泥比阻（Specific Cake Resistance，SRF）分別降至85.86%和4.74×1011 m/kg；FeCl3耦合NaClO調(diào)理后的泥餅含水率和污泥比阻分別降至86.36%和3.93×1011 m/kg。調(diào)理后的污泥絮體粒徑D50的大小關(guān)系為：NaClO+PFS>NaClO+FeCl3>pH值>原泥>NaClO。顯然，經(jīng)過氧化—絮凝調(diào)理后的污泥絮體粒徑明顯增大，濾液中的有機質(zhì)含量降低。氧化—絮凝調(diào)理可使活性污泥比阻顯著降低，脫水性能顯著改善。NaClO耦合PFS和NaClO耦合FeCl3有望成為高效環(huán)保、價格低廉的新型污泥脫水調(diào)理劑。
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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