DOI: 10.1016/j.watres.2018.08.069
Scopus记录号: 2-s2.0-85053763236
论文题名: Enhancing soluble phosphate concentration in sludge liquor by pressurised anaerobic digestion
作者: Latif M.A. ; Mehta C.M. ; Batstone D.J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 145 起始页码: 660
结束页码: 666
语种: 英语
英文关键词: Microbial community
; Nutrients recovery
; pH
; Phosphorus
; Pressurised anaerobic digestion
; Volatile solids
Scopus关键词: Metal ions
; Metals
; Microorganisms
; pH
; Phosphorus
; Precipitation (chemical)
; Recovery
; Sludge digestion
; Solubility
; Acid accumulations
; Biological performance
; High pressure operations
; Microbial communities
; Model-based analysis
; Phosphate recovery
; Soluble phosphates
; Volatile solid
; Anaerobic digestion
; Archaea
; Bacteria (microorganisms)
; Bacteroidales
; Rikenellaceae
英文摘要: Recovery of phosphate from wastewater is challenging, with one of the best opportunities being recovery from sludge anaerobic digestion liquor, as struvite. However, this is limited by the proportion of total phosphorous which is soluble, due to in-digester metal ion precipitation. High-pressure anaerobic digestion may enable enhanced phosphate solubility (and hence recovery potential), without the use of added acid, due to an increased liquid phase CO2 concentration. This was tested at 2, 4, and 6 bar absolute (bara) vs a 1 bara control reactor, fed with activated sludge. Increased pressure significantly (p = 0.0008), increased the fraction of phosphate that was soluble, ranging from 52% at 1 bara, to 75% at 6 bara. Model based analysis indicated that the main reason for increased solubility was pH depression (down to 6.4 at 6 bara), rather than changes in ion pairing (with carbonates) or increases in ionic activity. However, biological performance was adversely impacted, with a substantial loss in VS and COD destruction (on the order of 5%–10% absolute). No organic acid accumulation was observed. Bacterial and archaeal communities were significantly impacted (p∼0.0003–0.0005), with a shift to specific organisms, including Bacteroidales Rikenellaceae within the bacteria, and a Deep Sea Euryarchaeotal Group at 2 bara, and Methanocellaceae within the archaea at 4 and 6 bara. The work indicates that high-pressure operation is a technically viable option to improve phosphate recovery, and produce a high-methane biogas product, but that the loss of overall conversion needs to be further addressed, possibly through two-stage digestion. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112447
Appears in Collections: 气候减缓与适应
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作者单位: Griffith School of Engineering and Build Environment, Griffith University, 170 Kessels Road, Nathan, Queensland 4111, Australia; Advanced Water Management Centre (AWMC), University of Queensland, Level 4, Gehrmann Bldg. (60), Research Road, Brisbane, Queensland 4072, Australia
Recommended Citation:
Latif M.A.,Mehta C.M.,Batstone D.J.. Enhancing soluble phosphate concentration in sludge liquor by pressurised anaerobic digestion[J]. Water Research,2018-01-01,145