A novel magnesium-rich tricalcium aluminate for simultaneous removal of ammonium and phosphorus: Response surface methodology and mechanism investigation

Yuting Mao; Shuqi Yu; Peng Li; Guoping Liu; Sida Ouyang; Zhongbang Zhu; Ping Zhang

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A novel magnesium-rich tricalcium aluminate for simultaneous removal of ammonium and phosphorus: Response surface methodology and mechanism investigation

机译：一种新型富含镁的铝酸钙，用于同时除去铵和磷：响应面方法和机制调查

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Coexisting ammonium (NH_4~+-N) and phosphate (PO_4~(3-)-P) in wastewater is one of the main causes of eutrophi-cation, which poses severe risks to aquatic ecosystem and human health worldwide. Herein, magnesium-rich tricalcium aluminate (Mg/C_3A), which was constructed by incorporating Mg into cement-based material C_3A via solid-state reaction, was employed in the simultaneous removal of NH_4~+-N and PO_4~(3+)-P. Considering the wastewater with unbalanced N/P ratio and fluctuant pH, the effect of multiple factors (Mg/C_3A dosage, pH, initial contaminant concentration, and temperature) on the removal of both ions were systematically investigated by employing response surface methodology technique. The results demonstrated that the impact order of the factors on the NH_4~+ removal by Mg/C_3A was: temperature ＞ Mg/C_3A dosage ＞ initial NH_4~+ concentration ＞ pH ＞ initial PO_4~(3-) concentration; the impact order on the PO_4~(3-) removal was: initial PO_4~(3-) concentration ＞ Mg/ C_3A dosage ＞ temperature ＞ pH ＞ initial NH_4~+ concentration. The maximum removal amount of NH_4~+ (54.13 mg g~(-1)) and PO_4~(3-) (56.47 mg g~(-1)) were obtained at: Mg/C_3A dosage = 3 g L~(-1), initial NH_4~+ concentration = 160 mg L~(-1) initial PO_4~(3-) concentration = 160 mg L~(-1), temperature = 308 K, and pH = 7. In addition, the possible interactive influence mechanisms were elucidated in depth. Mg~(2+) played a major role in the PO_4~(3-) removal by forming struvite (MgNH_4PO_4·6H_2O) and newberyite (MgHPO_4·3H_2O). OH~- released from Mg/C_3A hydration mainly contributed to NH_4~+ removal. This work showed that Mg-rich C_3A is a promising candidate for simultaneous removal of NHJ and PO_4~(3-), shedding light on practical water remediation.

机译：废水中共存铵（NH_4〜+ -N）和磷酸盐（PO_4〜（3 - ） - P）是富营养阳离子的主要原因之一，对全世界的水生生态系统和人类健康构成严重风险。在此，通过将Mg掺入水泥基材料C_3A通过固态反应来制备富含富含镁的铝酸钙（Mg / C_3A），同时除去NH_4〜+ -N和PO_4〜（3+） -P。考虑到不平衡的N / P比和波动pH的废水，通过采用响应面方法技术系统地研究了多种因素（Mg / C_3A剂量，pH，pH，初始污染物浓度和温度）对两个离子的去除的影响。结果表明，的因素对NH_4的影响为了〜+去除被Mg / C_3A是：温度>的Mg / C_3A剂量>初始NH_4〜+浓度> pH值>初始PO_4〜（3-）浓度; PO_4〜（3-）去除的影响顺序是：初始PO_4〜（3-）浓度> Mg / C_3A剂量>温度> pH>初始NH_4〜+浓度。获得NH_4〜+（54.13mg G〜（-1））和PO_4〜（3-）（56.47mg g〜（-1））的最大去除量：mg / c_3a剂量= 3g l〜（ - 1），初始NH_4〜+浓度= 160mg L〜（-1）初始PO_4〜（3-）浓度= 160mg L〜（-1），温度= 308 k，pH = 7.此外，还有可能互动影响机制深入阐明。 Mg〜（2+）通过形成struvite（mgnh_4po_4·6h_2o）和newberyite（mghpo_4·3h_2o）在Po_4〜（3-）中发挥了重要作用。 OH〜 - 释放Mg / C_3A水合，主要导致NH_4〜+去除。这项工作表明，富含Mg的C_3A是同时去除NHJ和PO_4〜（3-）的有希望的候选者，在实际水处理上脱落。

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来源
《Environmental research》 |2021年第4期|110719.1-110719.11|共11页
作者
Yuting Mao; Shuqi Yu; Peng Li; Guoping Liu; Sida Ouyang; Zhongbang Zhu; Ping Zhang;
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作者单位

School of Mechanical and Electrical Engineering Nanchang University Nanchang 330031 China Office of MRL Development Committee of Jiangxi Province Nanchang 330046 China;

Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education School of Environmental and Chemical Engineering Nanchang University Nanchang 330031 China;

Australian Institute for Bioengineering and Nanotechnology The University of Queensland Brisbane QLD 4072 Australia;

School of Mechanical and Electrical Engineering Nanchang University Nanchang 330031 China;

Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education School of Environmental and Chemical Engineering Nanchang University Nanchang 330031 China;

Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education School of Environmental and Chemical Engineering Nanchang University Nanchang 330031 China;

Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education School of Environmental and Chemical Engineering Nanchang University Nanchang 330031 China;

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正文语种 eng
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关键词
Ammonium (NH_4~+); Phosphate (PO_4~(3-)); Magnesium-rich tricalcium aluminate (Mg/C_3A); Response surface; Simultaneous removal;

机译：铵（NH_4〜+）;磷酸盐（PO_4〜（3-））;富含镁的胰酸钙（Mg / C_3A）;响应面;同时删除;

A novel magnesium-rich tricalcium aluminate for simultaneous removal of ammonium and phosphorus: Response surface methodology and mechanism investigation

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