title: Greenhouse gas emissions from sludge treatment reed beds.
abstract: Sludge treatment reed bed systems (STRBs) are considered as an alternative technology for surplus sludge treatment. Organic matter is decomposed by various microbial reactions, resulting in gases such as CO₂and CH₄emitting into the atmosphere. The aim of this study is to investigate gas emission from STRBs. The static transparent chamber was adopted to measure gas emission; it allows sunlight to enter and plants to photosynthesise. The comparison of total solids and volatile solids showed STRBs have a higher efficiency in dewatering and mineralization than a conventional unplanted sludge drying bed (USDB). The CO₂emission ranged from 28.68 to 100.42 g CO₂m⁻² d(-1) in USDB, from 16.48 to 65.18 g CO₂m⁻² d⁻¹ in STRBs; CH₄emission ranged from 0.26 to 0.99 g CH₄ m⁻² d⁻¹ in USDB, from 0.43 to 1.95 g CH₄m⁻² d⁻¹ in STRBs. Both gas fluxes decreased towards the end of vegetation and reached the highest rates during the hot and dry summer. After the system was loaded by sludge, the fluxes of CO₂and CH₄significantly decreased in the USDB, whereas they increased in STRBs. In terms of CO₂equivalent, the global warming potential of CH₄was 13.13 g CO₂eq m⁻² d⁻¹ and 15.02 g CO₂eq m⁻² d⁻¹ in USDB and STRBs, respectively.
authors: Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun, China; College of Environment and Resources, Dalian Nationalities University, 18 Liaohe West Road, Dalian 116600, China E-mail: city-water@163.com.
authors: Yubo
authors: Y
authors: Cui
authors: College of Materials Science & Chemical Engineering, Harbin Engineering University, Harbin, China.
authors: Shunli
authors: S
authors: Zhang
authors: College of Environment and Resources, Dalian Nationalities University, 18 Liaohe West Road, Dalian 116600, China E-mail: city-water@163.com.
authors: Zhaobo
authors: Z
authors: Chen
authors: College of Environment and Resources, Dalian Nationalities University, 18 Liaohe West Road, Dalian 116600, China E-mail: city-water@163.com.
authors: Rui
authors: R
authors: Chen
authors: College of Environment and Resources, Dalian Nationalities University, 18 Liaohe West Road, Dalian 116600, China E-mail: city-water@163.com.
authors: Xinnan
authors: X
authors: Deng
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D003890:Desiccation; D005740:Gases; D017752:Greenhouse Effect; D008697:Methane / Q000032:analysis*; D006109:Poaceae / Q000378:metabolism*; D045483:Rivers; D012722:Sewage / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000379:methods*; D053833:Wetlands
chemical_list: D000393:Air Pollutants; D005740:Gases; D012722:Sewage; D002245:Carbon Dioxide; D008697:Methane