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Applying chemical sedimentation process in drinking water treatment plant to address the emergent arsenic spills in water sources |
Pengfei LIN1,Xiaojian ZHANG1,Hongwei YANG1,Yong LI1,2,Chao CHEN1,*() |
1. School of Environment, Tsinghua University, Beijing 100084, China 2. Changping Water Authority of Beijing, Beijing 102200, China |
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Abstract Arsenic (As) spills occurred more frequently and sometimes polluted water sources in recent years in China. It is as urgent need to develop emergency treatment technologies to address the arsenic threat for large-scale water treatment plants. In response, we developed a chemical sedimentation technology to remove arsenic contaminants for water treatment plants. Bench-scale experiments were conducted to investigate the efficiency of arsenic removal and the influencing factors of the chemical sedimentation treatment process. The influencing factors included the choice and dosage of coagulants, the valence of arsenic and pH value of solution. The As(V) contaminants can be almost completely removed by ferric or alum coagulants. The As(III) contaminants are more recalcitrant to chemical sedimentation, 75% for ferric coagulant and 40% for alum coagulant. The quantitative results of arsenic removal load by different ferric or alum coagulants were presented to help determine the parameters for arsenic treatment technology. The dominant mechanism for arsenic removal is static combination, or adsorption of negative arsenic species onto positive ferric hydroxide or alum hydroxide flocs. The efficiency of this treatment technology has also been demonstrated by a real production test in one water treatment plant with arsenic-rich source water and one emergency response. This technology was verified to be quick to set-up, easy to operate and highly efficient even for high concentration of arsenic.
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Keywords
Arsenic spill
chemical sedimentation
coagulation
drinking water
emergency treatment
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Corresponding Author(s):
Chao CHEN
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Online First Date: 12 June 2014
Issue Date: 31 December 2014
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