MBBR用于南方某污水厂强化脱氮效果分析
- Title:
- Analysis of Denitrification Efficiency of a Wastewater Treatment Plant in South China Enhanced by MBBR
- Keywords:
- MBBR; biological denitrification; simultaneous nitrification and denitrification; suspended carrier
- 摘要:
- 浙江某污水厂设计规模为16×104 m3/d，采用Bardenpho—MBBR工艺进行升级改造后，生化池出水COD、NH4+ - N、TN、TP均值分别为17.2、0.37、7.72、0.168 mg/L，在不投加碳源的情况下即可达到准Ⅳ类水标准，生物脱氮除磷效果良好。对生化池各功能区沿程采样测定发现，好氧MBBR区对TN的去除率为28%~46%，受到泥浆水冲击后也能保持在15%~22%，系统高效去除TN得益于好氧MBBR区的同步硝化反硝化（SND）作用；由于好氧区的SND现象，平均可以节省0.23元/m3的碳源费用，年节约碳源费用近1 343.2万元；生物膜厚度和溶解氧的控制对于稳定表现SND有重要影响；系统中微生物的高通量测序结果显示，悬浮载体上硝化菌丰度为32.19%、反硝化菌丰度为4.86%，硝化菌和反硝化菌同时存在为SND现象的产生提供了微观保证；冬季低温时，悬浮载体实际承担了系统近90%的硝化负荷。
- Abstract:
- The design scale of a wastewater treatment plant (WWTP) in Zhejiang Province was 16×104 m3/d. After retrofitted by Bardenpho-MBBR, the effluent COD, NH4+ - N, TN and TP of the WWTP were 17.2 mg/L, 0.37 mg/L, 7.72 mg/L and 0.168 mg/L, respectively. Without carbon addition, the effluent almost achieved class Ⅳ level of Environmental Quality Standards for Surface Water, which indicated that good biological nitrogen and phosphorus removal were obtained. According to the measurement of every functional area of the biochemical tank, 28%-46% of TN was removed in the aerobic area of the MBBR, and the removal efficiency could be maintained between 15% and 22% after the shock of muddy water. The good TN removal efficiency was benefited from simultaneous nitrification and denitrification (SND) in the MBBR zone. Due to the SND phenomenon in the aerobic zone, the carbon source cost could be saved by 0.23 yuan/m3 on average, and the annual carbon source cost could be saved by 13.432 million yuan. Control of biofilm thickness and dissolved oxygen had an important effect on stable performance of SND. High?throughput sequencing of microorganisms in the system showed that the relative abundances of nitrifying bacteria and denitrifying bacteria on the suspended carrier were 32.19% and 4.86%, respectively. The simultaneous presence of nitrifying bacteria and denitrifying bacteria made SND phenomenon possible to happen. When the temperature was low in winter, nearly 90% of the nitrification load of the system was actually consumed by the suspended carrier.
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