Phosphorus recovery from anaerobic supernatant of EBPR process based on HAP crystallization

被引：3
|
作者：
Dai H. [1 ,2 ]
Lü X. [1 ,2 ]
Gao Q. [1 ,2 ]
机构：
[1] School of Energy and Environment, Southeast University, Nanjing
[2] ERC Taihu Lake Water Environment, Wuxi
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2016年 / 46卷 / 05期
关键词：
Anaerobic supernatant; Hydroxyapatite; Induced crystallization; Phosphorus recovery;
D O I：
10.3969/j.issn.1001-0505.2016.05.021
中图分类号：
学科分类号：
摘要：
With calcite as seed crystal, an induced hydroxyapatite (HAP) crystallization process was developed for phosphorus recovery from anaerobic supernatant of EBPR (enhanced biological phosphorus removal) in air-agitated crystallization columns. The influences of the pre-aeration rate and time, molar ratio of Ca/P, reaction time, aeration intensity, seed crystal size, and loads on the recovery rate were systematically investigated. The optimal test results show that when the seed diameter in mesh is 100 to 150, the seed dosage is 30 g/L, the n(Ca)/n(P) is 2.5 and the reaction time is 35 min, the phosphorus recovery rate of 68.82% is obtained, and the yield of microcrystalline drops to 21.32%. During the system stability by continuous water input for 30 d, the reaction system maintains an average recovery rate of 73.43%. Morphologies and structures of crystallized products characterized by SEM, EDS and XRD show that HAP and its intermediates are the main products. © 2016, Editorial Department of Journal of Southeast University. All right reserved.
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页码：1020 / 1026
页数：6
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