Phosphorous recovery from wastewater with low phosphorous concentration by means of HAP-seeded crystallization of calcium phosphate
XIAO Hui-yi, NIE Xiao-bao, WAN Jun-li, DENG Quan-qing, WANG Yi-rui, LONG Yuan-nan, JIANG Chang-bo
Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Engineering and Technical Center of Hunan Provincial Environmental Protection for River-lake Dredging Pollution Control, School of Hydraulic &Environmental Engineering, Changsha University of Science &Technology, Changsha 410114, China
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.
肖辉毅, 聂小保, 万俊力, 邓权庆, 王奕睿, 隆院男, 蒋昌波. HAP诱导磷酸钙结晶回收低磷污水中的磷[J]. 中国环境科学, 2022, 42(4): 1681-1687.
XIAO Hui-yi, NIE Xiao-bao, WAN Jun-li, DENG Quan-qing, WANG Yi-rui, LONG Yuan-nan, JIANG Chang-bo. Phosphorous recovery from wastewater with low phosphorous concentration by means of HAP-seeded crystallization of calcium phosphate. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1681-1687.
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