College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
Bioresour Technol. 2017 Dec;245(Pt A):954-961. doi: 10.1016/j.biortech.2017.09.023. Epub 2017 Sep 5.
An anaerobic/anoxic/oxic (AAO) wastewater treatment system combining with a potassium ferrate (KFeO) oxidation side-stream reactor (SSR) was proposed for sludge reduction. Batch experiments showed that optimal KFeO dosage and reaction time for sludge disintegration was 100mg/g suspended solids (SS) and 24h, respectively. Subsequently, an AAO-SSR and a conventional AAO were operated in parallel to investigate effects of KFeO oxidation on process performance, sludge characteristics and microbial community structures. The AAO-SSR process operated under the optimized condition achieved efficient COD and NH-N removal, and reduced sludge by 47.5% with observed yield coefficient of 0.21gSS/g COD. KFeO addition broke sludge particles, increased dissolved organic matters in the mixed liquor, and improved sludge dewaterability. Illumina-MiSeq sequencing results showed that KFeO oxidation in the AAO-SSR decreased microbial richness and diversity, enriched slow growers (Dechloromonas), anaerobic fermentative bacteria (Azospira) and Fe(III)-reducing bacteria (Ferribacterium), but limited the growth of phosphate-accumulating organisms.
一种结合高铁酸钾（KFeO）氧化侧流反应器（SSR）的厌氧/缺氧/好氧（AAO）废水处理系统被提出用于减少污泥。批处理实验表明，污泥解体的最佳 KFeO 用量和反应时间分别为 100mg/g 悬浮固体（SS）和 24h。随后，AAO-SSR 和传统的 AAO 平行运行，以研究 KFeO 氧化对工艺性能、污泥特性和微生物群落结构的影响。在优化条件下运行的 AAO-SSR 工艺实现了高效的 COD 和 NH-N 去除，污泥减少了 47.5%，观察到的产率系数为 0.21gSS/g COD。KFeO 的添加打破了污泥颗粒，增加了混合液中的溶解有机物，并提高了污泥的脱水性能。Illumina-MiSeq 测序结果表明，AAO-SSR 中的 KFeO 氧化降低了微生物的丰富度和多样性，富集了慢速生长菌（Dechloromonas）、厌氧发酵菌（Azospira）和 Fe(III)-还原菌（Ferribacterium），但限制了聚磷菌的生长。
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