基于酸浸焚烧污泥灰中的磷释放及蓝铁矿生成

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Abstract Acid leaching incinerated sewage sludge ash (ISSA) which is a wet chemical process to extract phosphorus (P), is widely employed due to its simple operation and low loss. In this study, the effects of acid concentration, acid leaching time and liquid-solid ratio on the phosphorus release performance and the leaching behavior of key metal elements (Ca, Al, Mg, Fe) of ISSA samples using H₂SO₄ and HCl as extraction solutions were investigated by analyzing phosphorus form and mineral phase transition in ISSA at different temperatures (600~900℃) with dried sludge as control. Finally, phosphorus recovery products were separated by acid leaching, cation exchange resin (CER) purification and precipitation. The results showed that the form of phosphorus in ISSA sample was mainly dominated by non-apatite inorganic phosphorus (NAIP), and part of NAIP could change to apatite inorganic phosphorus (AP) with the increase of incineration temperature. At the same time, after acid leaching with two extraction solutions, Ca, Al and Mg were the highest released metals in sludge samples, among of which the leaching amount of Ca and Mg changed slightly while Al decreased sharply with the increase of incineration temperature. Moreover, ISSA had a better phosphorus release performance at 800℃ compared with other incineration temperatures, and the phosphorous release performance of H₂SO₄ acid leaching was better than that of HCl acid leaching. As H₂SO₄ concentration was 0.10mol/L, liquid-solid ratio was 150mL/g and acid leaching time was 150min, the phosphorus release rate reached the highest. Analysis and characterization revealed that, the phosphorus recovery product synthesized from H₂SO₄ leaching solution after CER purification was highly purified vivianite.

Key words： phosphorus recovery incinerated sewage sludge ash (ISSA) phosphorus form acid leaching vivianite

Received: 07 June 2022

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X703.1

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	Articles by authors
	KANG Su-qin
	ZHENG Ya-qing
	YANG Rui
	SANG Qian-qian
	MA Juan

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KANG Su-qin,ZHENG Ya-qing,YANG Rui等. Phosphorus release and formation of vivianite from acid leaching incineration sludge ash[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 225-233.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/225

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