ZHANGQiao-lin,WUGan-lin,LIAOSi-fan,et al.Application and Practical Implementation of iMLE Process for Enhancing Nitrogen Removal and Energy Saving and Consumption Reduction[J].China Water & Wastewater,2025,41(5):88-94.
iMLE工艺强化脱氮和节能降耗的应用实践
- Title:
- Application and Practical Implementation of iMLE Process for Enhancing Nitrogen Removal and Energy Saving and Consumption Reduction
- Keywords:
- iMLE process; biological nitrogen removal; municipal sewage; production test; energy saving and consumption reduction
- 摘要:
- 利用间歇式缺氧-好氧工艺（iMLE）工艺，对深圳市深水光明水质净化厂一组生化系统进行了强化脱氮改造。在生产性试验中，当处理量为2.5×104~3.15×104 m3/d时，分别在雨季、旱季和旱季高流量下，分析了iMLE工艺的脱氮效率、曝气风量消耗、碳源投加量，以及污泥硝化与反硝化活性等。在雨季（8月1日—10月8日）、旱季（10月9日—12月2日）和旱季高流量（12月3日—31日）三个阶段，进水总氮浓度分别为21.9、32.3和42.2 mg/L，BOD5/TN值分别为2.9、3.2和2.9，总氮容积负荷分别为45.9、61.8和92.3 g/（m3·d），表明三个阶段的进水TN浓度和负荷差异显著，而BOD5/TN值差异不大。三个阶段的平均出水总氮浓度分别为4.7、5.8和8.5 mg/L，平均去除率分别为78.2%、81.7%和79.4%。试验期间，iMLE工艺未投加任何碳源，相比于平行的两级A/O工艺，节约碳源投加费用约0.15 元/m3。旱季高流量时，iMLE工艺去除单位COD所消耗的气量相比两级A/O工艺仍下降了41%。此外，当碳源充足时，iMLE工艺和两级A/O工艺的最大污泥反硝化速率分别为4.4和3.6 mg/（gVSS·h），表明iMLE工艺污泥的反硝化活性更强。因此，iMLE工艺能协同提高脱氮效率、降低脱氮成本和减少碳排放量，为污水厂改造提供了新方案。
- Abstract:
- One of the biological treatment units at Shenshui Guangming Wastewater Treatment Plant were upgraded for enhancing nitrogen removal through the implementation of intermittent modified Ludzack-Ettinger (iMLE). In the production test, when the treatment capacity was 2.5×104 m3/d to 3.15×104 m3/d, the nitrogen removal efficiency, aeration air consumption, carbon source dosage, and sludge nitrification and denitrification activities of the iMLE process were analyzed under the conditions of rainy season, dry season, and dry season with high flow, respectively. During the rainy season (from August 1 to October 8), the dry season (from October 9 to December 2), and the dry season with high flow (from December 3 to December 31), the total nitrogen of the influent was 21.9 mg/L, 32.3 mg/L, and 42.2 mg/L, respectively. The corresponding BOD5/TN ratios were 2.9, 3.2, and 2.9. The total nitrogen volumetric load were 45.9 g/(m3·d), 61.8 g/(m3·d), and 92.3 g/(m3·d), respectively. These data indicated significant variations in the influent total nitrogen and volumetric load across the three periods, while the BOD5/TN ratios remained relatively consistent. The mean total nitrogen of the effluent in the three periods were 4.7 mg/L, 5.8 mg/L, and 8.5 mg/L, respectively, with corresponding average removal efficiencies of 78.2%, 81.7%, and 79.4%. During the field experiment, the iMLE process did not require the addition of any carbon source, thereby eliminating the associated cost of approximately 0.15 yuan/m3 compared to the parallel two-stage A/O process. During the dry season with high flow, the air consumption for removing unit COD using the iMLE process remained 41% lower compared to that of the two-stage A/O process. Under conditions of adequate carbon sources, the maximum specific denitrification rates for the iMLE process and the two-stage A/O process were 4.4 mg/(gVSS·h) and 3.6 mg/(gVSS·h), respectively. This indicated that the iMLE process exhibited superior denitrification activity compared to the two-stage A/O process. Therefore, the iMLE process enhances the efficiency of nitrogen removal, reduces the associated costs, and decreases carbon emissions, thereby offering a novel solution for wastewater treatment plant upgrading.
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