诱导结晶反应器型式对低磷污水磷回收的影响

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Abstract The simulated secondary effluent of domestic sewage plant along with the Hydroxycalcium Phosphate (HAP, as crystal seeds) were used to evaluate the recovery effect of Ca-P crystalline phosphorus in continuous stirred reactor (CSR) and fluidized bed reactor (FBR); and the phosphorus recovery mechanisms were investigated with SEM, EDS and XRD techniques in view of the particle size and quantity changes in the crystal products. The results showed that the phosphorus recovery rate of CSR was significantly better than that of FBR when the initial PO₄^3--P concentration was 1mg/L. The recovery efficiency of CSR maintained above 90% within 72h, while that of FBR dropped to less than 50% after 18h. The continuous stirring of CSR inhibited the seed sedimentation effectively and avoided significant reduction in the quantity and surface area of seed particles, thus maintaining the stable operation of the reactor; moreover, it also promoted the fragmentation of crystal nuclei and the growth of broken crystal nuclei, achieved the phosphorus recovery through secondary nucleation, and resulted in further improvement of the phosphorus recovery efficiency. Evidently, the type of a reactor would not change the crystal form of its crystallization products, so that the products of both reactors were still the HAP and its precursors, as well as amorphous calcium phosphate (ACP) and octacalcium phosphate (OCP).

Key words： reactor style low concentrated PO₄^3--P sewage phosphorous recovery induced-crystallization hydroxyapatite

Received: 24 September 2022

PACS:

X703.1

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	DENG Quan-qing
	NIE Xiao-bao
	WAN Jun-li
	XIAO Hui-yi
	XIAO Da-feng
	LIAO Min-fei
	LIU Wan-qi

Cite this article:

DENG Quan-qing,NIE Xiao-bao,WAN Jun-li等. Influences of induced crystallization reactor styles on phosphorous recovery from low phosphorous sewage[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2296-2302.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2296

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