DOI: 10.1016/j.watres.2017.11.006
Scopus记录号: 2-s2.0-85033362343
论文题名: Variations of moisture and organics in activated sludge during Fe0/S2O8 2− conditioning–horizontal electro-dewatering process
作者: Li H. ; Wang Y. ; Zheng H.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 129 起始页码: 83
结束页码: 93
语种: 英语
英文关键词: Activated sludge
; Extracellular polymeric substance
; Fe0/S2O8 2− conditioning
; Horizontal electro-dewatering
; Organic variation
; Water distribution
Scopus关键词: Activated sludge process
; Amino acids
; Biogeochemistry
; Biological materials
; Chemical water treatment
; Chemicals removal (water treatment)
; Electroosmosis
; Fractal dimension
; Organic compounds
; Particle size
; Polymers
; Water supply systems
; Activated sludge
; Electro-dewatering
; Extra-cellular polymeric substances
; Organic variation
; Water distributions
; Dewatering
; extracellular polymeric substance
; ferrous ion
; iron
; organic matter
; persulfate
; polymer
; polysaccharide
; protein
; sulfate
; tryptophan
; unclassified drug
; water
; iron
; polymer
; polysaccharide
; protein
; activated sludge
; coagulation
; dewatering
; feasibility study
; moisture content
; organic matter
; oxidation
; pollutant removal
; polysaccharide
; protein
; transformation
; activated sludge
; Article
; biosolid
; capillary
; conditioning
; electro dewatering process
; electroosmosis
; flocculation
; fractal analysis
; liquid
; moisture
; oxidation
; particle size
; priority journal
; response surface method
; sludge dewatering
; solid
; supernatant
; waste component removal
; waste water management
; water content
; zeta potential
; analysis
; chemistry
; desiccation
; electricity
; evaluation study
; oxidation reduction reaction
; procedures
; sewage
; waste management
; Desiccation
; Electricity
; Iron
; Oxidation-Reduction
; Particle Size
; Polymers
; Polysaccharides
; Proteins
; Sewage
; Waste Management
; Water
英文摘要: The feasibility of using Fe0/S2O8 2− conditioning (zero valence iron (ZVI)/persulfate (ps)) integrated with horizontal electro-dewatering (HED) to improve the dewaterability of activated sludge (AS) was evaluated. The removal and migration of free and bound water in the ZVI/ps–HED process were determined, along with the organic matter migration between the solid and liquid phases of AS biosolids. Results showed that the optimum conditioning dosages were determined as 0.35 g ZVI/g dry solids (DS) and 0.15 g ps/g DS on the basis of capillary suction time variation. The lowest final water content (WC) of 83.67% in AS occurred after the HED treatment at 40 V and 120 min as determined using the response surface methodology. Despite the disruption of AS flocs and microbial cells through SO4 −· oxidation during the ZVI/ps conditioning, the particle size and mass fractal dimension of the AS flocs remained relatively stable as the zeta potential increased from −8.5 mV to −4.6 mV. The coagulation of Fe3+ from the oxidation of Fe2+ by ps contributed to the relatively stable condition, which favored the subsequent momentum of the electroosmotic flow. Moreover, the ZVI/ps conditioning decreased the bound water content (BWC, from 1.83 g/g DS to 1.38 g/g DS) and increased the free water content (FWC, from 60.27 g/g DS to 60.91 g/g DS), indicating a transformation from free water to bound water. After the ZVI/ps–HED process, the FWC and BWC were removed significantly with ratios of 96.32% and 79.78%, respectively. Along with water removal through the ZVI/ps–HED process, the organic matter in the supernatant/filtrate initially increased and further rose at the HED stage. The analysis of the extracellular polymeric substance (EPS) content showed that the proteins (PNs) and polysaccharides (PSs) at the liquid and solid phases decreased due to oxidative degradation. Furthermore, the ZVI/ps stage significantly reduced the PNs content of slime to 57.22%, the PSs content of EPS to 68.50%, and the PN-like substances in the slime and tightly bound EPS to 74.90% and 52.47%, respectively. In addition, the WC of AS correlated with the contents of PN and microbial by-product-like material in slime, as well as tryptophan in TB-EPS, and the low EPS content in AS indicated good dewaterability. Thus, ZVI/ps should be selected as a pretreatment prior to HED. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113072
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing, 100083, China; Key Laboratory of the Three Gorges Reservoir Region´s Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, China
Recommended Citation:
Li H.,Wang Y.,Zheng H.. Variations of moisture and organics in activated sludge during Fe0/S2O8 2− conditioning–horizontal electro-dewatering process[J]. Water Research,2018-01-01,129