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首页> 外文期刊>Environmental Engineering Science >Effect of Ferrous Ion Coagulation on Biological Ammonium Nitrogen Removal in Treating Coke Wastewater
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Effect of Ferrous Ion Coagulation on Biological Ammonium Nitrogen Removal in Treating Coke Wastewater

机译：亚铁离子混凝处理焦炭废水中生物氨氮的去除效果

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Effects of ferrous ion coagulation in treating coke wastewater were examined through tests. In addition, nitrification tests using coagulated coke wastewater were carried out to evaluate the effect of ferrous ion coagulation on biological ammonium nitrogen removal. Experimental results showed that ferrous ion coagulation was very effective in terms of free cyanide (CN~-) removal. The best free CN~-removal was found to be 98% at a ferrous ion dosage of 242 mg Fe~(2+) L~(-1). In addition, ferrous ion coagulation was also effective for the removal of turbidity. The highest turbidity removal was observed to be 88% at a ferrous ion dosage of 242 mg Fe~(2+) L~(-1), where the best free CN~- removal was found. This indicates that the determination of optimum ferrous ion dosage for free CN~- removal could be indicated by turbidity removal. Although ferrous ion coagulation caused a decrease in total alkalinity, it did not affect nitrification. In triplicate nitrification tests, the best NH_4~+-N removal rate in nitrification was found to be 16.43 mg NH_4~+-N L~(-1) h~(-1) in residual solution, where the highest free CN~- removal was observed by coagulation tests. Consequently, it was found that, in terms of biological ammonium nitrogen removal, ferrous ion coagulation contributed to 35% enhancement compared to that of noncoagulated coke wastewater by reducing the concentration of free CIST from raw coke wastewater.
机译：通过测试检查了亚铁离子混凝处理焦炭废水的效果。此外，还使用凝结的焦化废水进行了硝化试验，以评估亚铁离子凝结对生物脱氮的影响。实验结果表明，亚铁离子混凝在去除游离氰化物（CN〜-）方面非常有效。发现在亚铁离子剂量为242 mg Fe〜（2+）L〜（-1）时，最佳的游离CN〜-去除率为98％。另外，亚铁离子凝结对于去除浊度也有效。当亚铁离子剂量为242 mg Fe〜（2+）L〜（-1）时，最高混浊去除率达到88％，其中游离CN〜-去除率最高。这表明可以通过去除浊度来确定用于游离CN〜-去除的最佳亚铁离子剂量的确定。尽管亚铁离子凝结导致总碱度降低，但它不影响硝化作用。在三次硝化试验中，硝化中的最佳NH_4〜+ -N去除率是残留溶液中的16.43 mg NH_4〜+ -NL〜（-1）h〜（-1），其中最高的游离CN〜-去除率通过凝血试验观察到。因此，发现在生物氨氮去除方面，亚铁离子凝结通过降低原焦废水中游离CIST的浓度，与未凝结的焦废水相比提高了35％。

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