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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Highly Efficient Recovery of Ammonium Nitrogen from Coking Wastewater by Coupling Struvite Precipitation and Microwave Radiation Technology
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Highly Efficient Recovery of Ammonium Nitrogen from Coking Wastewater by Coupling Struvite Precipitation and Microwave Radiation Technology

机译：鸟粪石与微波辐射耦合技术高效去除焦化废水中的氨氮

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摘要

In this study, to reduce the removal cost of total ammonia nitrogen (TAN) from coking wastewater via struvite crystallization, a struvite recycling process combined with microwave radiation technology was investigated. The results indicated that the nitrogenous heterocyclic and phenolic compounds present in coking wastewater obviously influenced struvite crystallization. If the formed struvite was decomposed by microwave (MW) radiation at OH~-:NH_4~+ of 1.15:1 for 300 s, about >97% of ammonium could be released from the struvite. In the decomposition process of MW radiation, it was found that the solid-liquid concentration of struvite in the solution system had a negligible effect on ammonium release. When the resulting decomposition product was recycled, to remove TAN from the coking wastewater at pH 8.5 and P:N molar ratio of 1:1 for 50 min, approximately 88% of TAN removal was achieved. In a seven-step process, the TAN-removal efficiency could be maintained at >80% with a little bittern supplementation. Cost analysis revealed that the proposed recycling process could reduce 54.4% of the struvite precipitation cost as compared to the nonrecycling process.
机译：在这项研究中，为减少通过鸟粪石结晶从焦化废水中去除总氨氮（TAN）的成本，研究了结合微波辐射技术的鸟粪石回收工艺。结果表明，焦化废水中存在的含氮杂环和酚类化合物明显影响鸟粪石的结晶。如果所形成的鸟粪石在1.15：1的OH〜-：NH_4〜+下被微波（MW）辐射分解300 s，则可以从鸟粪石中释放出约97％以上的铵。在微波辐射的分解过程中，发现溶液系统中鸟粪石的固液浓度对铵释放的影响可忽略不计。当回收的分解产物被循环使用时，要在pH 8.5和P：N摩尔比为1：1的条件下从焦化废水中去除TAN 50分钟，则可以去除约88％的TAN。在七个步骤的过程中，仅需添加少量的卤水即可将TAN去除效率保持在> 80％。成本分析表明，与非回收工艺相比，拟议的回收工艺可减少鸟粪石沉淀成本的54.4％。

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