以高纯度蓝铁矿回收剩余污泥中磷——基于酸浸-纯化-铁电絮凝三步法

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Abstract An innovative technique for extracting phosphorus and synthesizing high-purity vivianite from incinerated sewage sludge ash was explored in this investigation, which experienced three principal stages, including leaching with sulfuric acid, purification via resin adsorption, and crystallization through iron electrocoagulation. The optimal conditions for acid leaching of phosphate (PO₄^3-) from incinerated sewage sludge ash were examined by the response surface methodology, and the optimal operational parameters for the iron electrocoagulation process were determined by the Box-Behnken Design. The results indicate that phosphorus extraction efficiency of 92.80% was achieved at a liquid-to-solid ratio of 37.60mL/g, a sulfuric acid concentration of 0.125mol/L, and an acid leaching duration of 90.0min, the metal cations interfering with phosphate precipitation, such as Ca²⁺, Mg²⁺, Al³⁺, and Fe^2+/3+ were efficiently removed by 732cation exchange resin, all phosphorus was removed from the solution successfully during the iron electrocoagulation process at an initial solution pH value of 2.00, a current of 2.00A, and a reaction time of 30.0min, meanwhile, vivianite with a purity of 97.37% were synthesized. The outcomes show that the three-step method facilitates phosphorus recovery from incinerated sewage sludge ash. 61.44% of the phosphorus was retrieved as high-purity vivianite through the three steps; the recovery process costs 14.66yuan per kilogram product of vivianite and yields a profit of 30.68yuan.

Key words： resin adsorption response surface methodology incinerated sewage sludge ash phosphate

Received: 12 June 2024

PACS:

X705

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	LIU Chang
	WEI Tao-yuan
	QIU Ao-xue
	LIAO Wu-bin
	HONG Hui
	DENG Dan-ni
	XIE Shi-wei

Cite this article:

LIU Chang,WEI Tao-yuan,QIU Ao-xue等. Phosphorus recovery and high purity vivianite synthesis from residual sludge—Based on acid leaching-purification-electrocoagulation three-stage process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(1): 234-242.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I1/234

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