DOI: 10.1016/j.watres.2018.03.046
Scopus记录号: 2-s2.0-85044464882
论文题名: Identifying, counting, and characterizing superfine activated-carbon particles remaining after coagulation, sedimentation, and sand filtration
作者: Nakazawa Y. ; Matsui Y. ; Hanamura Y. ; Shinno K. ; Shirasaki N. ; Matsushita T.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 138 起始页码: 160
结束页码: 168
语种: 英语
英文关键词: Filtrate
; Image analysis
; PAC
; SPAC
; Zeta potential
Scopus关键词: Activated carbon
; Chemical water treatment
; Coagulation
; Flocculation
; Image analysis
; Microfiltration
; Particle size
; Picture archiving and communication systems
; Potable water
; Sand
; Water filtration
; Water treatment plants
; Zeta potential
; Activated carbon particles
; Conventional water treatment
; Drinking water purification
; Filtrate
; Particle number concentration
; Particle volume concentrations
; Powdered activated carbon
; SPAC
; Activated carbon treatment
; activated carbon
; carbon
; activated carbon
; adsorption
; coagulation
; concentration (composition)
; drinking water
; filtration
; image analysis
; particulate matter
; pollutant removal
; purification
; sedimentation
; water treatment plant
; adsorption
; Article
; concentration (parameters)
; filtration
; flocculation
; image analysis
; microphotography
; particle size
; particulate matter
; priority journal
; quantitative analysis
; sand
; sedimentation
; software
; water contamination
; water treatment
; zeta potential
; analysis
; filtration
; particle size
; procedures
; water management
; water pollutant
; Adsorption
; Carbon
; Filtration
; Flocculation
; Particle Size
; Particulate Matter
; Water Pollutants, Chemical
; Water Purification
英文摘要: Superfine powdered activated carbon (SPAC; particle diameter ∼1 μm) has greater adsorptivity for organic molecules than conventionally sized powdered activated carbon (PAC). Although SPAC is currently used in the pretreatment to membrane filtration at drinking water purification plants, it is not used in conventional water treatment consisting of coagulation–flocculation, sedimentation, and rapid sand filtration (CSF), because it is unclear whether CSF can adequately remove SPAC from the water. In this study, we therefore investigated the residual SPAC particles in water after CSF treatment. First, we developed a method to detect and quantify trace concentration of carbon particles in the sand filtrate. This method consisted of 1) sampling particles with a membrane filter and then 2) using image analysis software to manipulate a photomicrograph of the filter so that black spots with a diameter >0.2 μm (considered to be carbon particles) could be visualized. Use of this method revealed that CSF removed a very high percentage of SPAC: approximately 5-log in terms of particle number concentrations and approximately 6-log in terms of particle volume concentrations. When waters containing 7.5-mg/L SPAC and 30-mg/L PAC, concentrations that achieved the same adsorption performance, were treated, the removal rate of SPAC was somewhat superior to that of PAC, and the residual particle number concentrations for SPAC and PAC were at the same low level (100–200 particles/mL). Together, these results suggest that SPAC can be used in place of PAC in CSF treatment without compromising the quality of the filtered water in terms of particulate matter contamination. However, it should be noted that the activated carbon particles after sand filtration were smaller in terms of particle size and were charge-neutralized to a lesser extent than the activated carbon particles before sand filtration. Therefore, the tendency of small particles to escape in the filtrate would appear to be related to the fact that their small size leads to a low destabilization rate during the coagulation process and a low collision rate during the flocculation and filtration processes. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112803
Appears in Collections: 气候减缓与适应
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作者单位: Graduate School of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan; Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan
Recommended Citation:
Nakazawa Y.,Matsui Y.,Hanamura Y.,et al. Identifying, counting, and characterizing superfine activated-carbon particles remaining after coagulation, sedimentation, and sand filtration[J]. Water Research,2018-01-01,138