DOI: 10.1016/j.watres.2018.08.057
Scopus记录号: 2-s2.0-85052639014
论文题名: Free-conditioning dewatering of sewage sludge through in situ propane hydrate formation
作者: Wu B. ; Horvat K. ; Mahajan D. ; Chai X. ; Yang D. ; Dai X.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 145 起始页码: 464
结束页码: 472
语种: 英语
英文关键词: Dewatering
; Propane hydrate
; Sewage sludge
; Solid-liquid separation
Scopus关键词: Chemical oxygen demand
; Dewatering
; Energy utilization
; Extraction
; Hydrates
; Molecules
; Phase equilibria
; Propane
; Sewage sludge
; Continuous operation
; Equilibrium pressure
; Further treatments
; Homogeneous crystals
; Material consumption
; Propane hydrate
; Separation performance
; Solid liquid separation
; Hydration
; concentration (composition)
; decomposition
; dewatering
; efficiency measurement
; in situ measurement
; organic compound
; performance assessment
; phase equilibrium
; separation
; sludge
英文摘要: The propane hydrate formation was proposed to have potentials in realizing free-conditioning dewatering of sewage sludge with implications to simultaneous clean water extraction and highly efficient volume reduction. Primarily, the investigation on phase equilibrium of propane hydrates found that the organic components of sewage sludge promoted the propane hydrate formation in terms of decreasing equilibrium pressure by up to 19.2%, compared with that in pure water. Further, the feasibility of hydrate-based dewatering was verified through the observation of propane hydrate formation in sewage sludge and also the quality analysis of water generated from decomposition of up-floated formed hydrates. The formation of up-floated propane hydrates extracted water molecules from sewage sludge into homogeneous crystal phase, which actually excluded sludge particles from hydrate phase and realized the reduction of water in sludge phase. The efficiency of water conversion into hydrates was determined by monitoring propane pressure, which indicated that 14 batch runs decreased the water content of sludge from 98.81wt.% to 44.3wt.% under free-conditioning conditions. The chemical oxygen demand, total nitrogen and total phosphorus of hydrate-extracted water were measured to be 21 ± 1 mg/L, 10.5 ± 0.2 mg/L and 0.4 ± 0 mg/L, respectively, which reflected the excellent separation performance and also indicated that the hydrate-extracted water can be directly discharged without further treatments. Finally, the unit energy consumption of hydrate-based dewatering process based on a continuous operation mode was calculated to be 2673.96 kW h/t dry solid of sewage sludge, which was nearly half of that in thermal drying process. Therefore, the propane hydrate-based process is believed to maximize the green operation of enhanced sludge dewatering while minimizing the energy and additional material consumption. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112459
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China; College of Engineering and Applied Science, Stony Brook University, 100 Nicolls Road, Stony BrookNY 11794, United States; Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois Street, Golden, CO 80401, United States; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China
Recommended Citation:
Wu B.,Horvat K.,Mahajan D.,et al. Free-conditioning dewatering of sewage sludge through in situ propane hydrate formation[J]. Water Research,2018-01-01,145