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Updated: Feb 22, 2026

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
Sludge reduction and microbial community structure in an anaerobic/anoxic/oxic process coupled with potassium ferrate
Ying An1, Zhen Zhou1, Jie Yao2
1College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
Abstract:
An anaerobic/anoxic/oxic (AAO) wastewater treatment system combining with a potassium ferrate (K2FeO4) oxidation side-stream reactor (SSR) was proposed for sludge reduction. Batch experiments showed that optimal K2FeO4 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 K2FeO4 oxidation on process performance, sludge characteristics and microbial community structures. The AAO-SSR process operated under the optimized condition achieved efficient COD and NH4+-N removal, and reduced sludge by 47.5% with observed yield coefficient of 0.21gSS/g COD. K2FeO4 addition broke sludge particles, increased dissolved organic matters in the mixed liquor, and improved sludge dewaterability. Illumina-MiSeq sequencing results showed that K2FeO4 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.
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