HAP诱导磷酸钙结晶回收低磷污水中的磷

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Abstract Phosphorous recovery from secondary treated effluent by crystallization of calcium phosphate (Ca-P), is one of effective strategies for phosphorous recovery from municipal wastewater. However, this strategy still needs further improvement, such as enhancing the quality of final products and improving the adaptability to low PO₄-P concentration. In this paper, phosphorous in simulated secondary treated effluent with initial PO₄-P concentration of 1.0mg/L was recovered by Ca-P crystallization using hydroxyapatite (HAP) as seeds. The recovery effects of induced crystallization were compared to that of homogeneous one, and the influence of both Ca/P mole ratio and dosage of seeds were investigated. Moreover, the induced crystal mechanism of Ca-P under low PO₄-P concentration was studied based on phosphorous recovery effects and SEM, EDS, XRD and FTIR of crystal products. The results showed that the disturb of seed materials to the quality and purity of final products was minimized, since HAP was the major polymorph of final products. For simulated secondary treated effluent, HAP-induced Ca-P crystallization possessed high phosphorous recovery performance and rapid start-up. The induced crystal models of Ca-P crystallization included layer-by-layer crystallization on the surface of seeds, and crystal bridge model of which crystallization occurred within the space among seeds particles. Under experimental conditions, phosphorous recovery efficiency over 80% was obtained, with HAP and its precursors, ACP and OCP, the main polymorphs of final products. CaCO₃ crystallization was proved to take place simultaneously with Ca-P, which disturbs the recovery of phosphorous. The result provides new ideas for simultaneous improvement of recovery efficiency and the quality and purity of final products for low concentrated PO₄-P wastewater.

Key words： hydroxyapatite (HAP) low concentrated PO₄-P wastewater phosphorous recovery calcium phosphate crystallization seed

Received: 08 October 2021

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X703.1

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	XIAO Hui-yi
	NIE Xiao-bao
	WAN Jun-li
	DENG Quan-qing
	WANG Yi-rui
	LONG Yuan-nan
	JIANG Chang-bo

Cite this article:

XIAO Hui-yi,NIE Xiao-bao,WAN Jun-li等. Phosphorous recovery from wastewater with low phosphorous concentration by means of HAP-seeded crystallization of calcium phosphate[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1681-1687.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1681

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