控制DO及FA条件下短程硝化过程系统稳定性研究
Study on stability of shortcut nitrification by controlling DO and FA
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摘要: 采用SBR工艺以水产品加工废水为研究对象，同时控制进水游离氨（FA）为0.96~1.25 mg/L，溶解氧（DO）为1~2 mg/L，实现了稳定的短程硝化过程。在此条件下，亚硝化率及氨氮去除率分别大于95%和88%，有机物（COD）去除率在90%以上，亚硝化速率维持在0.9666×10-3~1.0375×10-3mg NO-2-N/(mg MLSS?h)之间。研究结果表明，同时控制DO及FA在适当范围之内可以获得稳定的短程硝化过程，并可降低系统能耗。本实验采用较低的FA浓度与较高的DO浓度（与OLAND工艺比较）得到了稳定的短程硝化过程，对水产品加工废水处理具有重要应用价值。Abstract: A stable shortcut nitrification-denitrification process was achieved adopting a sequencing batch reactor to treat the wastewater from sea-food processing process， in which the influent free ammonia (FA) and dissolved oxygen (DO) were controlled in the range of 0.96~1.25 mg/L and 1~2 mg/L， respectively. Under these conditions， the nitrosation rate and the ammonium-N removal rate were above 95% and 88%， respectively， while the chemical oxygen demand (COD) removal rate was above 90%， and the nitrosation velocity was kept at 0.9666×10-3~1.0375×10-3 mg NO-2-N/(mg MLSS?h). These results demonstrated that stable shortcut nitrification process could be obtained through simultaneously controlled the appropriate amounts of DO and FA. Furthermore， the system energy consumption could be reduced greatly. In this experiment， the stable shortcut nitrification-denitrification process was achieved with a lower FA concentration and a higher DO amount (with comparison to OLAND process)， providing an important value for the practical sea-food processing wastewater treatment.
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Key words:
- FA /
- DO /
- shortcut nitrification /
- nitrosation rate /
- stability
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