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RISS 인기검색어
- 검색키워드
- 저자 : Naresh Singhal (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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A Discussion of the Scientific Principles Underlying The Effective Phytotreatment of Stormwater
( Naresh Singhal ),( Anthea Johnson ) 한국물환경학회 ( 구 한국수질보전학회 ) 2006 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2006 No.-
Rapid urbanisation in Auckland, and other urban parts of New Zealand, has resulted in increased generation of stormwater containing dissolved pollutants such as heavy metals and synthetic organics, which can be difficult to remove in conventional filters. In addition, the accumulation of contaminants can lead to decreased filter performance. Bioretention systems may offer a solution. These systems generally consist of an engineered permeable soil with specific vegetation and associated microorganisms. During a storm event, runoff entering the bioretention system infiltrates the soil, where sediments and dissolved pollutants are retained. In the period between rain events, contaminants are mobilized by compounds produced by plants and bacteria. Subsequently, plants can take up the dissolved contaminants via their root network. Additionally, pollutants can be degraded by plants and the associated microbial communities in the rhizosphere. Plant matter can be regularly harvested for disposal. While the design and implementation of such systems appear to be simple, this simplicity is deceptive as suggested by the variable and often poor performance of such systems in practice. The processes occurring in the rhizosphere are varied and complex. This paper presents a review of the processes occurring in a stormwater bioretention system with the objective of motivating discussion on ways to improve the performance of such systems.
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( Naresh Singhal ),( Anthea Johnson ) 대한상하수도학회 2006 공동춘계 학술발표회 논문집 Vol.2006 No.-
Rapid urbanisation in Auckland, and other urban parts of New Zealand, has resulted in increased generation of stormwater containing dissolved pollutants such as heavy metals and synthetic organics, which can be difficult to remove in conventional filters. In addition, the accumulation of contaminants can lead to decreased filter performance. Bioretention systems may offer a solution. These systems generally consist of an engineered permeable soil with specific vegetation and associated microorganisms. During a storm event, runoff entering the bioretention system infiltrates the soil, where sediments and dissolved pollutants are retained. In the period between rain events, contaminants are mobilized by compounds produced by plants and bacteria. Subsequently, plants can take up the dissolved contaminants via their root network. Additionally, pollutants can be degraded by plants and the associated microbial communities in the rhizosphere. Plant matter can be regularly harvested for disposal. While the design and implementation of such systems appear to be simple, this simplicity is deceptive as suggested by the variable and often poor performance of such systems in practice. The processes occurring in the rhizosphere are varied and complex. This paper presents a review of the processes occurring in a stormwater bioretention system with the objective of motivating discussion on ways to improve the performance of such systems.
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Degradation of Chlorinated Phenols by Zero Valent Iron and Bimetals of Iron: A Review
Buddhika Gunawardana,Naresh Singhal,Peter Swedlund 대한환경공학회 2011 Environmental Engineering Research Vol.16 No.4
Chlorophenols (CPs) are widely used industrial chemicals that have been identified as being toxic to both humans and the environment. Zero valent iron (ZVI) and iron based bimetallic systems have the potential to efficiently dechlorinate CPs. This paper reviews the research conducted in this area over the past decade, with emphasis on the processes and mechanisms for the removal of CPs, as well as the characterization and role of the iron oxides formed on the ZVI surface. The removal of dissolved CPs in iron-water systems occurs via dechlorination, sorption and co-precipitation. Although ZVI has been commonly used for the dechlorination of CPs, its long term reactivity is limited due to surface passivation over time. However, iron based bimetallic systems are an effective alternative for overcoming this limitation. Bimetallic systems prepared by physically mixing ZVI and the catalyst or through reductive deposition of a catalyst onto ZVI have been shown to display superior performance over unmodified ZVI. Nonetheless, the efficiency and rate of hydrodechlorination of CPs by bimetals depend on the type of metal combinations used, properties of the metals and characteristics of the target CP. The presence and formation of various iron oxides can affect the reactivities of ZVI and bimetals. Oxides, such as green rust and magnetite, facilitate the dechlorination of CPs by ZVI and bimetals, while oxide films, such as hematite, maghemite, lepidocrocite and goethite, passivate the iron surface and hinder the dechlorination reaction. Key environmental parameters, such as solution pH, presence of dissolved oxygen and dissolved co-contaminants, exert significant impacts on the rate and extent of CP dechlorination by ZVI and bimetals.
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