Revealing calcium ion behavior during anaerobic phosphorus release process in aerobic granular sludge system
Revealing calcium ion behavior during anaerobic phosphorus release process in aerobic granular sludge system
复制标题
揭示好氧颗粒污泥系统厌氧释磷过程中钙离子的行为
DOI：
10.1016/j.biortech.2022.128474
复制
发表时间：
2023
影响因子：
11.4
通讯作者：
Lee D.-J.
中科院分区：
文献类型：
--
作者：
Wang J.;Li Z.;Wang Q.;Chen X.;Lei Z.*;Shimizu K.;Zhang Z.;Adachi Y.;Lee D.-J.
钙离子（Ca 2+）是废水生物除磷的重要因素，但其在厌氧释磷过程中的行为尚未得到充分的研究。研究了细菌好氧颗粒污泥（AGS）系统中Ca 2+的释放机理。在非曝气（厌氧）阶段，在AGS反应器底部检测到Ca 2+浓度增加近40%，其中pH降低和Mg 2+浓度增加。厌氧释磷引起的pH值下降导致颗粒内CaCO 3溶解，导致Ca 2+释放。此外，从多聚磷酸盐的水解增加的Mg 2+离子被检测到可逆地与颗粒中的Ca 2+交换，ΔCa/ΔMg的摩尔比为0.51-0.65。结果表明，CaCO 3的溶解和Ca 2+与Mg 2+的离子交换是厌氧释磷过程中Ca 2+释放的两个主要因素。
Calcium ions (Ca2+) are important for biological phosphorus (P) removal from wastewater, but its behavior has not been well documented during the anaerobic P release process. This study is aimed to explore the mechanisms of Ca2+release in bacterial aerobic granular sludge (AGS) system. During the non-aeration (anaerobic) phase, nearly 40 % increase in Ca2+concentration was detected at the bottom of AGS reactor where decrease in pH and increase in Mg2+concentration occurred. The pH decrease due to anaerobic P release caused CaCO3dissolution inside the granules, leading to Ca2+release. In addition, the increased Mg2+ions from hydrolysis of polyphosphates were detected to reversibly exchange with Ca2+in granules at a molar ΔCa/ΔMg ratio of 0.51–0.65. Results from this work revealed that dissolution of CaCO3and ions exchange between Ca2+and Mg2+were the two major contributors to Ca2+release during anaerobic P release process.