MBBR用于南方某污水廠強化脫氮效果分析
- Title:
- Analysis of Denitrification Efficiency of a Wastewater Treatment Plant in South China Enhanced by MBBR
- 關(guān)鍵詞:
- 移動床生物膜反應(yīng)器; 生物脫氮; 同步硝化反硝化; 懸浮載體
- Keywords:
- MBBR; biological denitrification; simultaneous nitrification and denitrification; suspended carrier
- 摘要:
- 浙江某污水廠設(shè)計規(guī)模為16×104 m3/d，采用Bardenpho—MBBR工藝進行升級改造后，生化池出水COD、NH4+ - N、TN、TP均值分別為17.2、0.37、7.72、0.168 mg/L，在不投加碳源的情況下即可達到準Ⅳ類水標準，生物脫氮除磷效果良好。對生化池各功能區(qū)沿程采樣測定發(fā)現(xiàn)，好氧MBBR區(qū)對TN的去除率為28%~46%，受到泥漿水沖擊后也能保持在15%~22%，系統(tǒng)高效去除TN得益于好氧MBBR區(qū)的同步硝化反硝化（SND）作用；由于好氧區(qū)的SND現(xiàn)象，平均可以節(jié)省0.23元/m3的碳源費用，年節(jié)約碳源費用近1 343.2萬元；生物膜厚度和溶解氧的控制對于穩(wěn)定表現(xiàn)SND有重要影響；系統(tǒng)中微生物的高通量測序結(jié)果顯示，懸浮載體上硝化菌豐度為32.19%、反硝化菌豐度為4.86%，硝化菌和反硝化菌同時存在為SND現(xiàn)象的產(chǎn)生提供了微觀保證；冬季低溫時，懸浮載體實際承擔了系統(tǒng)近90%的硝化負荷。
- 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. Highthroughput 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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