期刊
WASTE MANAGEMENT
卷 60, 期 -, 页码 201-210出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2016.10.055
关键词
Incineration; Incinerator sewage sludge ash (ISSA); Phosphorus recovery; Pyrolysed sewage sludge char (PSSC); Pyrolysis; Sewage sludge
资金
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/G037612/1]
- University of Surrey Engineering Doctorate Programme
- Thames Water Ltd.
This research compares and contrasts the physical and chemical characteristics of incinerator sewage sludge ash (ISSA) and pyrolysis sewage sludge char (PSSC) for the purposes of recovering phosphorus as a P-rich fertiliser. Interest in P recovery from PSSC is likely to increase as pyrolysis is becoming viewed as a more economical method of sewage sludge thermal treatment compared to incineration. The P contents of ISSA and PSSC are 7.2-7.5% and 5.6%, respectively. Relative to the sludge, P concentrations are increased about 8-fold in ISSA, compared to roughly 3-fold in PSSC. Both PSSC and ISSA contain whitlockite, an unusual form of calcium phosphate, with PSSC containing more whitlockite than ISSA. Acid leaching experiments indicate that a liquid/solid ratio of 10 with 30 min contact time is optimal to release PO4P into leachate for both ISSA and PSSC. The proportion of P extracted from PSSC is higher due to its higher whitlockite content. Heavy metals are less soluble from PSSC because they are more strongly incorporated in the particles. The results suggest there is potential for the development of a process to recover P from PSSC. (C) 2016 Elsevier Ltd. All rights reserved.
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