Production of technical grade phosphoric acid from incinerator sewage sludge ash (ISSA) |
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| Authors: | S Donatello D Tong CR Cheeseman |
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| Institution: | 1. School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;2. Ehime Prefectural Institute of Public Health and Environmental Science, 8-234, Sanbancho, Matsuyama, Ehime 790-0003, Japan;3. Daiki Axis Co., Ltd., 1-9-1, Misawa, Matsuyama, Ehime 791-8022, Japan;4. Graduate School of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama, Ehime 790-8566, Japan;1. Institute for Water Quality, Resource and Waste Management, Vienna University of Technology, Karlsplatz 13/226, 1040 Vienna, Austria;2. The Centre for Water Resource Systems (CWRS) at the Vienna University of Technology, Karlsplatz 13/222, 1040 Vienna, Austria;1. Mineral and Energy Economy Research Institute, Polish Academy of Sciences, Wybickiego 7 Str., 31-261, Cracow, Poland;2. AGH University of Science and Technology, Cracow, Poland |
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| Abstract: | The recovery of phosphorus from sewage sludge ash samples obtained from 7 operating sludge incinerators in the UK using a sulfuric acid washing procedure to produce a technical grade phosphoric acid product has been investigated. The influences of reaction time, sulfuric acid concentration, liquid to solid ratio and source of ISSA on P recovery have been examined. The optimised conditions were the minimum stoichiometric acid requirement, a reaction time of 120 min and a liquid to solid ratio of 20. Under these conditions, average recoveries of between 72% and 91% of total phosphorus were obtained. Product filtrate was purified by passing through a cation exchange column, concentrated to 80% H3PO4 and compared with technical grade H3PO4 specifications. The economics of phosphate recovery by this method are briefly discussed. |
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