A ²O 工艺城市再生水厂减污降碳协同效益评估与绿色低碳运行策略

Synergistic benefit assessment of reductions in pollution and in CO ₂ emission and green low-carbon operation strategies for urban recycled water plant with A ²O process

摘要

以 A²O 工艺再生水厂为研究对象，构建减污降碳协同评价体系，开展情景分析，深入揭示典型城市再生水厂减污降碳协同效益及碳减排潜力，提出绿色低碳运行策略. 研究结果表明：该再生水厂在减污维度中 COD、BOD₅、SS、NH₃-N、TP 污染物削减率均>95%，出水满足 DB11/890-2012《城镇污水处理厂水污染物排放标准》，减污指标评分达优秀；在降碳维度，基准情景下平均降碳得分为 77.2 分，通过实施污泥资源化、太阳能光伏、水源热泵等技术及综合优化，平均得分提升至 92.0 分，增幅达 19.2%；在协同效益方面，基准情景减污降碳综合得分为 87.7 分，技术集成后综合得分达 95.1 分的优秀水平；在综合优化情景下，再生水厂绿色低碳运行综合得分较基准情景提高 8.4%，年际碳排放强度降至 0.297 kg·m^-3，COD 去除率每提升 1%，污水体积碳排放强度下降 0.8%. 研究表明，资源回收与清洁能源利用技术是提升再生水厂减污降碳协同效益的核心路径，为再生水厂融入“双碳”管理提供高效技术支撑.

Abstract

To explore the synergistic benefits of reductions both in pollution and in carbon emission, and carbon emission reduction potential of urban recycled water plants, a recycled water plant with A ²O process at a capacity of 600 000 m ³·d ^-1 was studied. A synergistic evaluation system for reductions in pollution and in carbon emission was established. A baseline scenario (BAU, business as usual), technology optimization scenarios (hypothesis 1, hypothesis 2), was set up. Five sub-scenarios ( S1- S5) of reduction in carbon emission, and a comprehensive scenario ( S6) were all studied. Quantitative analysis was done combining monitoring data and simulation models. For reduction in pollution, the removal rates of COD, BOD ₅, SS, NH ₃-N, and TP all reached over 95% (with TN removal rate ranging from 64% to 78%), with the effluent meeting Discharge Standard of Water Pollutants for Municipal Wastewater Treatment Plants (DB11/ 890-2012). The pollution reduction index score reached an excellent level. For reduction in carbon emissions, average carbon emission reduction score under the baseline scenario was 77.2 (Grade C). The scenario implementing technologies such as sludge resource utilization, solar photovoltaic, and water-source heat pump increased the average carbon emission reduction score to 92.0 (with a growth rate of 19.2%). Comprehensive emission reduction scenario S6 raised the carbon emission reduction index score from baseline 77.2 to 92.0, with an increase of 19.2%. For synergistic benefits, comprehensive score of pollution reduction and carbon emission reduction under the baseline scenario was 87.7 (Grade B), and after technology integration, the comprehensive score reached 95.1 (excellent level). In scenario S6, the comprehensive score of green low-carbon operation of the recycled water plant was 8.4% higher than that under BAU, the inter-annual carbon emission intensity decreased to 0.297 kg·m ^-3, and the carbon emission intensity per unit of wastewater decreased by 0.8%. This study indicates that resource recoveries and clean energy utilization technologies are core to improving the synergistic benefits of pollution reduction and carbon emission reduction in recycled water plants. This provides efficient technical support for recycled water plants to integrate into “dual-carbon” management.

关键词

A ²O 工艺 / 再生水厂 / 绿色低碳运行 / 减污降碳协同 / 碳减排策略 / 情景分析

Key words

A ²O process / recycled water plant / green low-carbon operation / synergy of pollution reduction and carbon emission reduction / carbon emission reduction strategy / scenario analysis

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基金资助

国家重点研发计划资助项目(2023YFC3205600)