废水中硫化物、硝酸盐和氨氮生物同步去除及其机理

摘要

Simultaneous removal of nitrate, sulfide and ammonia could be realized at HRT of 12 h, temperature of 30℃±2℃and influent pH of 7.5. The removal rates were up to 95%, 90% and 99% for ammonia, nitrate and sulfide at influence concentrations of 22—35 mg N·L−1, 22—35 mg N·L−1 and 50—90 mg S·L−1, respectively. Most of sulfide removed was converted to elemental sulfur (S0) and the conversion rate was as high as 89%. Batch experiment results indicated that presence of sulfide could enhance simultaneous removal of nitrate and ammonia. The results of this study provided an innovative idea for the development of sulfide- and nitrogenous contaminants-laden wastewater treatment technology.%在HRT为12 h，温度为30℃±2℃，进水pH为7.5，进水硫化物、硝酸盐氮和氨氮浓度分别为50～90 mg S·L−1，22～35 mg N·L−1和22～35 mg N·L−1条件下，能够实现氨氮、硝酸盐氮和硫化物3类污染物的同步去除，去除率分别达到97.3%、92.8%和99%以上，而且去除的硫化物主要以单质硫形式存在，单质硫理论转化率达89%以上。间歇实验结果表明，S2−的存在能够促进 NO−3-N、NH+4-N 的同步去除。研究结果为含硫含氮废水的生物处理技术的发展提供了新思路。