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Effects of Ferric Salt Forms on Phosphorus Removal

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The efficiency of Phosphorus removal of ferric chloride (ionic state), polyferric chloride (polymer state) and ferric hydroxide (gel state) from the effluent of municipal sawage treatment plant was studied. Total phosphorus (TP) in the effluent was 1.74 mg·L−1. The results showed that ferric chloride was the best among the three forms of ferric salt coagulants. When the dosage of ferric chloride was 40 mg ·L−1, the phosphorus removal rate could reach 90%, and TP in the treated wastewater was less than 0.17 mg·L−1. The effluent quality could meet the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002). while the phosphorus removal rate of polyferric chloride was 62%, the phosphorus removal rate of ferric hydroxide was 59% respectively, and the phosphorus concentration of the effluent couldn't meet the first level A (GB18918-2002) after coagulation treatment with 40 mg·L−1 coagulants. Results indicate that different forms of ferric salts have different effect on phosphorus removal rate, and the phosphorus removal performance of ferric chloride is better than polyferric chloride and ferric hydroxide.
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Document Type: Research Article

Publication date: November 1, 2013

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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