| 沸石强化生化装置脱氮功能的效果及机理初探 |
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| 中文关键词 沸石 离子交换 硝化与反硝化 硝化内源呼吸率 |
| 英文关键词 zeolite ion exchange nitrification and denitrification endogenous respiration of nitrification |
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| 中文摘要 |
| 针对石化工业废水开展沸石强化脱氮处理试验研究，通过比较沸石浓度25mg/L与空白，以及沸石浓度25 mg/L与50mg/L两阶段脱氮效果，探讨沸石促进脱氮功能的机理，结果表明，曝气池中投加沸石可明显提高氨氮和总氮的去除率，硝化细菌总数和硝化功能也得到增强。与空白对照组相比， 沸石浓度25mg/L的试验组运行稳定后，氨氮去除率提高约10%~13%，总氮去除率约提高13%，出水中NO3--N含量约提高100%，氨氮与总氮之比下降6%，内源硝化耗氧呼吸速率可提高138%，硝化细菌总数是空白对照组2.2folds。沸石浓度提高到50mg/L后，试验组的脱氮效果略有增加，但效果不明显。通过对试验结果的关联分析，认为沸石提高系统脱氮能力的原因一方面是因为沸石对NH4+及硝态氮的交换吸附，另一方面NH4+离子富集于沸石表面及内部、沸石颗粒独特的好氧-缺氧微环境，以及沸石离解出CO32- 或HCO3-增加碱度等条件，促进了硝化细菌和反硝化细菌的生长，从而提高了系统脱氮能力。 |
| 英文摘要 |
| Aim to enhanced nitrogen removal from wastewater by addition zeolite to aeration tank, The result showed that addition of zeolite could improve the nitrification/denitrification efficiencies by comparing two phase experiment of 25mg/L with blank and 25mg/L with 50 mg/L. and the population of nitrifying bacteria in activated sludge increased obviously. When 25mg/L zeolite was added into aeration tank, NH4+-N and TN removal increased 10~13% and 13% respectively, endogenous respiration rate of nitrification increased about 138%,and the population of nitrification bacteria increased about 2.2 folds; But the nitrogen removal and endogenous respiration rate of 50 mg/L enhanced indistinct comparing with 25 mg/L. These results indicated that NH4+ ion-exchange and accumulation to the interior/outer surfaces of zeolite, co-existence of aerobic and anoxic micro-environments were responsible for the enhanced denitrifying function. |
