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Effects of aeration on gamma irradiation of sewage sludge
Authors:Libing Chu  Jianlong Wang  Bo Wang
Affiliation:1. College of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, Shaanxi Province, China;2. Department of Management Engineering, Qiqihar Institute of Engineering, Qiqihar 161005, Heilongjiang Province, China;1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, PR China;2. State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, PR China;1. Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China;2. Beijing Key Laboratory of Radioactive Wastes Treatment, Tsinghua University, Beijing 100084, PR China;1. Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, IPEN/CNEN-SP, Av. Prof. Lineu Prestes 2242, CEP 05508-000, São Paulo, Brazil;2. Fundacentro, Ministério do Trabalho, MTE, Rua Capote Valente 710, CEP 05422-970, São Paulo, Brazil;3. Instituto de Pesquisa em Ciência dos Materiais, Universidade Federal do Vale do São Francisco, IPCM/ UNIVASF, Av. Antônio Carlos Magalhães 510, CEP 48902-300, Juazeiro, Bahia, Brazil;4. Departamento de Energia Nuclear, Universidade Federal de Pernambuco, DEN/UFPE, Av. Prof. Luiz Freire 1000, CEP 50740-540, Recife, Pernambuco, Brazil;1. Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China;2. Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education, Tsinghua University, Beijing 100084, PR China
Abstract:In this paper the effect of aeration on gamma irradiation of sewage sludge was investigated to examine the potential solubilization of solids in sewage sludge to ultimately reduce the solids volume for disposal. Results showed that aeration increased the effectiveness of gamma radiation. The efficiency of sludge solubilization with aeration was increased by around 25% compared to that without aeration at an irradiation dose of 2.5–9 kGy. The soluble protein, polysaccharide and humic (like) substance concentrations were higher under aerated conditions. With aeration the overall reaction appears to be oxidative as evidenced by the higher nitrate and nitrite ion concentrations in solution.
Keywords:
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