期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 10, 期 4, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.108117
关键词
Ash mineralogy; Chemical addition; Heavy metal extraction; Phosphorus extraction; Sewage sludge
资金
- Fonds Wetenschappelijk Onderzoek Vlaanderen (FWO) (Belgium) [1S08418N - 1S08420N]
This study investigates the influence of adding chemicals to sewage sludge prior to incineration on the ash mineralogy and the extraction of phosphorus (P) and heavy metals. Results show that adding chemicals changes the P mineralogy, but has little effect on P extraction efficiency. However, it significantly affects the extraction of heavy metals.
Sewage sludge ash (SSA) rich in phosphorus (P) is a promising alternative for non-renewable phosphate rock. However, wet chemical P extraction from SSA can co-extract considerable amounts of heavy metals depending on the type of extraction liquid used. In this study, addition of chemicals to sewage sludge (SS) prior to incineration was investigated for its influence on the ash mineralogy and related P and heavy metal extraction using sulfuric acid, hydrochloric acid and oxalic acid. The additives selected consisted of Al, Ca, Fe, Mg and Na chlorides, sulfates and carbonates. Results showed that the addition of chemicals to SS prior to incineration changed the P mineralogy in the SSA, but this had generally almost no effect on the P extraction efficiency. The only exception was the addition of calcium chloride, sodium chloride or carbonates, which decreased the P extraction efficiency. Conversely, addition of chemicals to SS prior to incineration significantly affected the extraction of heavy metals from the SSA. Overall, the addition of aluminum chloride, iron(III) chloride, magnesium chloride or aluminum sulfate to SS prior to incineration offered the best trade-off between high P extraction and low heavy metal coextraction.
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