Greenhouse gas emissions from sludge treatment reed beds

Author:

Cui Yubo12,Zhang Shunli3,Chen Zhaobo2,Chen Rui2,Deng Xinnan2

Affiliation:

1. Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun, China

2. College of Environment and Resources, Dalian Nationalities University, 18 Liaohe West Road, Dalian 116600, China

3. College of Materials Science & Chemical Engineering, Harbin Engineering University, Harbin, China

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 CO2 and CH4 emitting 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 CO2 emission ranged from 28.68 to 100.42 g CO2 m−2 d−1 in USDB, from 16.48 to 65.18 g CO2 m−2 d−1 in STRBs; CH4 emission ranged from 0.26 to 0.99 g CH4 m−2 d−1 in USDB, from 0.43 to 1.95 g CH4 m−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 CO2 and CH4 significantly decreased in the USDB, whereas they increased in STRBs. In terms of CO2 equivalent, the global warming potential of CH4 was 13.13 g CO2eq m−2 d−1 and 15.02 g CO2eq m−2 d−1 in USDB and STRBs, respectively.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

Reference25 articles.

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5. Methanogenesis and CH4 emissions: effects of water table, substrate type and presence of Phragmites australis;Grűnfeld;Aquatic Botany,1999

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