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Sludge reduction using aquatic worms under different aeration regimes
Cai, Lu1; Gao, Ding2; Wang, Kan1; Liu, Hong-tao2; Wan, Xiao-ming2
2017
Source PublicationENVIRONMENTAL TECHNOLOGY
ISSN0959-3330
Volume38Issue:6Pages:737-743
Corresponding AuthorCai, Lu(cailu@nbu.edu.cn)
AbstractAdding aquatic worms to a wastewater treatment system can reduce sludge production through predation. The aeration level is crucial for success. To evaluate aeration impacts on sludge reduction and determine an optimal aeration regime, this study investigated the processes of in-situ sludge reduction, using aquatic worms exposed to different aeration levels. The experiment also compared treatment results between a conventional reactor and an aquatic worm reactor (WR). Results indicated that the recommended concentration of dissolved oxygen (DO) was 2.5 mg L-1. The removal rate of chemical oxygen demand remained steady at 80% when the DO concentration was higher than 2.5 mg L-1, while the removal rate of ammonia nitrogen continued to moderately increase. Increasing the DO concentration to 5 mg L-1 did not improve sludge reduction, and consumed more power. With a DO concentration of 2.5 mg L-1 and a power of 0.19 kWh t(-1) water, the absolute sludge reduction and relative sludge reduction rates in the WR were 60.0% and 45.7%, respectively, and the daily aquatic worm growth rate was 0.150 d(-1) during the 17-d test. Therefore, at the recommended aeration regime, aquatic worms reduced the sludge without increasing the power consumption or deteriorating the effluent.
KeywordAeration aquatic worms dissolved oxygen sludge reduction wastewater treatment
DOI10.1080/09593330.2016.1210241
WOS KeywordMICROBIAL COMMUNITY STRUCTURE ; MEMBRANE BIOREACTOR ; WASTE SLUDGE ; LARGE-SCALE ; PERFORMANCE ; REACTOR ; EVAPORATION ; PREDATION
Indexed BySCI
Language英语
Funding ProjectZhejiang Provincial Natural Science Foundation of China[LQ14D010001] ; National Natural Science Fundation of China[41401538] ; Wong Magna Fund in Ningbo University
Funding OrganizationZhejiang Provincial Natural Science Foundation of China ; National Natural Science Fundation of China ; Wong Magna Fund in Ningbo University
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000396790600010
PublisherTAYLOR & FRANCIS LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/64844
Collection中国科学院地理科学与资源研究所
Corresponding AuthorCai, Lu
Affiliation1.Ningbo Univ, Fac Architectural & Environm, Fac Civil Engn & Environm, 818 Fenghua Rd, Ningbo 315211, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Cai, Lu,Gao, Ding,Wang, Kan,et al. Sludge reduction using aquatic worms under different aeration regimes[J]. ENVIRONMENTAL TECHNOLOGY,2017,38(6):737-743.
APA Cai, Lu,Gao, Ding,Wang, Kan,Liu, Hong-tao,&Wan, Xiao-ming.(2017).Sludge reduction using aquatic worms under different aeration regimes.ENVIRONMENTAL TECHNOLOGY,38(6),737-743.
MLA Cai, Lu,et al."Sludge reduction using aquatic worms under different aeration regimes".ENVIRONMENTAL TECHNOLOGY 38.6(2017):737-743.
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