K2FeO4-FeCl3联合强化剩余污泥厌氧消化产酸

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摘要通过碱性高铁酸钾(K₂FeO₄)-FeCl₃预处理联合厌氧消化对剩余污泥进行减量化处理,探讨不同形态的铁源及不同铁浓度对以有机酸回收为目标的污泥减量化过程的影响,并寻找最适铁投加量.结果表明在预处理过程中碱性K₂FeO₄对污泥聚集体结构破坏起着重要作用.与空白相比,挥发性悬浮物固体(VSS)下降了26.79%, 中值粒径(Dx(50))下降了90%,污泥沉降比(SV₃₀)下降了33%,污泥沉降性能变好,减量效果明显. FeCl₃在预处理过程仅具有絮凝作用.在厌氧消化过程,经碱K₂FeO₄预处理后的污泥产酸量高于空白组.适量铁离子的增加可加速有机酸的产生速率.最适铁投加量20mg Fe/g VSS的K₂FeO₄及21mg Fe/g VSS的FeCl₃(即TFe投加量为41mg Fe/g VSS)的产酸效果最好, 在消化第3d挥发性有机酸达到峰值(436.1mg COD/g VSS),是空白组峰值的4.45倍.当经过15d消化后,PO₄^3--P去除率达69.8%,是仅投加K₂FeO₄预处理的2.03倍.此外,适量铁的投加还有利于产酸菌(Actinobacteria门和Chloroflexi门)富集,促进了厌氧消化产酸速率提升,而铁投加量高于48mg Fe/g VSS反而会抑制厌氧环境中产酸菌的活性.

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	田梦佳
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关键词 ： K₂FeO₄, FeCl₃, 剩余污泥, 厌氧消化, 挥发性脂肪酸

Abstract：The excess sludge was reduced by alkaline potassium ferrate (K₂FeO₄)-FeCl₃ pretreatment combined with anaerobic digestion. Under the goal of efficient recovery of organic acid, the effects of different forms of iron sources and iron concentrations on sludge reduction were discussed, and the optimal iron concentration was found. The results showed that alkaline K₂FeO₄ played an important role in the destruction of sludge aggregates during pretreatment. Compared with the blank group, Volatile Suspended Solids (VSS) decreased by 26.79%, median diameter (Dx(50)) decreased by 90%, and sludge settling velocity of 30minutes (SV₃₀) decreased by 33%. The sludge settling performance became better and the sludge reduction effect was obvious. FeCl₃ only had flocculation during pretreatment process. During anaerobic digestion, the acid production of sludge pretreated with alkaline K₂FeO₄ was higher than that of blank group, and the increase of iron ions promoted the rapid production of organic acids. When the dosage of K₂FeO₄ was 20mg Fe/g VSS and FeCl₃ was 21mg Fe/g VSS (that is, TFE dosage of 41mg Fe/g VSS), the sludge showed the maximum volatile organic acids (VFAs) accumulation. On the 3^th of digestion, the VFAs reached 436.1mg COD/g VSS, which was 4.45times that of the blank group. Under this iron concentration, after 15days of digestion, the removal rate of PO₄^3--P reached 69.8%, which was 2.03 times that of only K₂FeO₄ pretreatment. In addition, adding appropriate iron could increase acid-producing bacteria (Actinobacteria phylum and Chloroflexi phylum), which will promote acid production, while the iron dosage was higher than 48mg Fe/g VSS, the activity of main acid-producing bacteria in anaerobic environment would be inhibited.

Key words： K₂FeO₄ FeCl₃ excess sludge anaerobic digestion volatile fatty acids (VFAs)

收稿日期: 2023-01-18

PACS:

X705

基金资助:国家自然科学基金资助项目(51938010)；江苏省实践创新计划项目(SJCX21-1406)

通讯作者: 李祥,副教授,anammox@126.com E-mail: anammox@126.com

作者简介: 田梦佳(1996-),女,河南驻马店人,硕士研究生,主要从事污泥减量及污泥资源化利用.发表论文1篇.1050094028@qq.com

引用本文:

田梦佳, 刘锋, 李祥, 马军, 王加恩, 赵魏东. K₂FeO₄-FeCl₃联合强化剩余污泥厌氧消化产酸[J]. 中国环境科学, 2023, 43(8): 4089-4098. TIAN Meng-jia, LIU Feng, LI Xiang, MA Jun, WANG Jia-en, ZHAO Wei-dong. Study on enhanced anaerobic digestion of excess sludge with K₂FeO₄ and FeCl₃ for organic acid production. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4089-4098.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I8/4089

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