WANGYa-jun,SONG Guang-han,XUYan-chao,et al.Optimization of Carbon Emission in Membrane Bioreactor through Aeration Rate Control Integrated with Powdered Activated Carbon[J].China Water & Wastewater,2025,41(13):40-48.
曝气量调控协同外加PAC对MBR的碳排放优化
- Title:
- Optimization of Carbon Emission in Membrane Bioreactor through Aeration Rate Control Integrated with Powdered Activated Carbon
- Keywords:
- membrane bioreactor; carbon emission accounting; gas-water ratio; powdered activated carbon; greenhouse gas
- 摘要:
- 为探究单个反应器的减污降碳水平及其优化措施，以粉末活性炭-膜生物反应器（PAC-MBR）工艺为研究对象，在不同气水比（50∶1、65∶1、80∶1）和PAC投加量（1.0、2.0 g/L）条件下设计了6种工况，结合微生物分解代谢、合成代谢、内源代谢机理，以及CO2、N2O和CH4三种温室气体的产生过程，初步评估了PAC-MBR工艺运行过程中化石源CO2、N2O、CH4的排放情况。结果表明，不同运行条件下各类温室气体的排放情况差异较大，当气水比为50∶1、PAC投加量为1.0 g/L时，N2O的总排放量最低，约为0.353 9 kg（以CO2计，下同）；相对好氧区域的化石源CO2排放量最低，约为0.012 84 kg。当气水比为80∶1、PAC投量为1.0 g/L时，相对厌氧区域的化石源CO2排放量最低，约为0.015 39 kg；相对厌氧区域的CH4排放量最低，约为3.347 8 kg。就间接排放的CO2而言，当气水比为80∶1、PAC投加量为2.0 g/L时排放量最大，当气水比为50∶1、PAC投加量为1.0和2.0 g/L时排放量最小。从碳排放总量来看，当气水比为50∶1、PAC投量为2.0 g/L时，处理单位水量的碳排放总量最低，约为0.003 0 kg/L，气水比的变化对碳排放总体的影响更强。
- Abstract:
- This study investigated the pollutants removal and carbon reduction in a single powdered activated carbon membrane bioreactor (PAC-MBR) and its optimization measures. Six operational conditions were established by varying the gas-water ratios (50∶1, 65∶1, 80∶1) and PAC dosages (1.0 g/L and 2.0 g/L), and the accounting of CO2, N2O and CH4 emissions during the operation of the PAC-MBR process was preliminarily explored based on the mechanisms of microbial catabolism, anabolism, and endogenous metabolism, as well as the production pathways of these greenhouse gases. Under varying operating conditions, the emissions of various greenhouse gases exhibited significant differences. Specifically, the total emission of N2O reached its minimum value of approximately 0.353 9 kg (expressed in CO2 equivalents, the same below) when the gas-water ratio was set to 50∶1 and the dosage of PAC was maintained at 1.0 g/L. The minimum CO2 emissions from fossil sources were observed in the relatively aerobic zone, measuring approximately 0.012 84 kg. When the gas-water ratio was 80∶1 and the PAC dosage was 1.0 g/L, the CO2 emissions from fossil sources in the relatively anaerobic zone reached their minimum value of approximately 0.015 39 kg. The minimum CH4 emissions were observed in the relatively anaerobic zone, measuring approximately 3.347 8 kg. Regarding indirect CO2 emissions, the highest emissions occurred when the gas-water ratio was 80∶1 and the PAC dosage was 2.0 g/L. Conversely,the lowest emission was observed at gas-water ratio of 50∶1 and PAC dosage of 1.0 g/L and 2.0 g/L. From the perspective of total carbon emissions, the total carbon emission per unit volume of treated wastewater reached its minimum value at approximately 0.003 0 kg/L when the gas-water ratio was 50∶1 and the PAC dosage was 2.0 g/L. Variation in gas-water ratio has a more significant impact on overall carbon emissions compared to variation in PAC dosage.
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