Enhancement of sludge reduction by ultrasonic pretreatment and packing carriers in the anaerobic side-stream reactor: Performance, sludge characteristics and microbial community structure. (February 2018)

• Record Type: Journal Article
• Authors: Cheng, Cheng; Zhou, Zhen; Qiu, Zhan; Yang, Jiyuan; Wu, Wei; Pang, Hongjian
• Is Part Of: Bioresource technology. Volume 249(2018)
• Page Start: 298
• Page End: 306
• Publication Date: 2018-02
• Subjects: Sludge reduction -- Anaerobic side-stream reactor -- Carrier -- Ultrasonic -- Microbial community -- Dissolved organic matters; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.10.043
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Improving sludge reduction of anaerobic side-stream reactor (ASSR) was studied. Combining ultrasonication and packing carriers enhanced sludge reduction by 426%. Packing carriers played more important roles for enhancement than ultrasonication. Packing carriers in ASSR improved sludge settleability and dewaterability. Packing carriers enriched slow-growing, fermentative and floc-forming bacteria. Abstract: Effects of ultrasonic pretreatment and packing carriers on sludge reduction, settleability, dewaterability and microbial community structure in the anaerobic side-stream reactor (ASSR) were investigated with three anaerobic reactors operated in parallel. Ultrasonication from 3.65% in the ASSR to 5.08%, and packing carriers further enhanced the efficiency to 19.2%. Ultrasonic pretreatment of sludge decreased oxidation–reduction potential in ASSR and enhanced the release of intracellular substances. The deterioration of sludge settleability and dewaterability in the ASSR after ultrasonic pretreatment was improved by packing carriers. Illumina-MiSeq sequencing showed that microbial richness and diversity increased after ultrasonic pretreatment and packing carriers in the ASSR. Packing carriers favored the growth of slow grower ( Dechloromonas ), fermentative bacteria ( Draconibacteriaceae, Fusibacter, Acidaminobacter ) and floc-forming bacteria ( Zoogloea ), while hydrolytic and predatory bacteria ( Saprospiraceae_unculture ) and slow grower ( Thauera ) was enriched in the ASSR.