Treatment of anaerobic digester effluents of nylon wastewater through chemical precipitation and a sequencing batch reactor process

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• 作者：Haiming Huang ; ^{huanghaiming52hu@163.com} ; Qianwu Song ; Wenjun Wang ; Shaowei Wu ; Jiankun Dai
• 关键词：Ammonia removal ; Brucite ; Chemical precipitation ; Nylon wastewater ; Sequencing batch reactor
• 刊名：Journal of Environmental Management
• 出版年：2012
• 期刊代码：82_03014797
• 类别：env
• 出版时间：30 June, 2012
• 卷：101
• 期：Complete
• 页码：68-74
• 文件大小：616 K

摘要

Chemical precipitation, in combination with a sequencing batch reactor (SBR) process, was employed to remove pollutants from anaerobic digester effluents of nylon wastewater. The effects of the chemicals along with various Mg:N:P ratios on the chemical precipitation (struvite precipitation) were investigated. When brucite and H₃PO₄ were applied at an Mg:N:P molar ratio of 3:1:1, an ammonia-removal rate of 81%was achieved, which was slightly more than that (80%) obtained with MgSO₄路7H₂O and Na₂HPO₄路12H₂O at Mg:N:P molar ratios greater than the stoichiometric ratio. To further reduce the ammonia loads of the successive biotreatment, an overdose of phosphate with brucite and H₃PO₄ was applied during chemical precipitation. The ammonia-removal rate at the Mg:N:P molar ratio of 3.5:1:1.05 reached 88%, with a residual PO₄-P concentration of 16聽mg/L. The economic analysis showed that the chemical cost of chemical precipitation could be reduced by about 41%when brucite and H₃PO₄ were used instead of MgSO₄路7H₂O and Na₂HPO₄路12H₂O. The subsequent biological process that used a sequencing batch reactor showed high removal rates of contaminants. The quality of the final effluent met the requisite effluent-discharging standards.