Immobilization of phosphorus in sewage sludge using inorganic amendments |
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| Authors: | Zhen Liang Xianjia Peng Jun Wang Zhaokun Luan Zhimei Liu Yunxia Wang |
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| Institution: | (1) State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing, 100085, People’s Republic of China;(2) School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, 100083, People’s Republic of China |
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| Abstract: | Sewage sludge contains large amount of water-soluble phosphorus, which is prone to runoff loss when sewage sludge is land
applied. Phosphorus export from sewage sludge is an important cause for water eutrophication. Immobilization of phosphorus
before sewage sludge land application seems necessary. In this study, three amendments including red mud (RM), lime and mixture
of RM and lime were employed to immobilize phosphorus in fresh sewage sludge. It was found that phosphorus was effectively
controlled by RM, lime and mixture of RM and lime. Sequential chemical extraction results indicate that the RM amendment transformed
H2O-P in the sewage sludge into the NaOH-P, while the lime amendment transformed H2O-P in the sewage sludge into the HCl-P. Such transformations in phosphorus fractions would have little influence on phosphorus
availability but would retard and reduce potential phosphorus loss following sewage sludge was land applied. |
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