华中地区某污水处理厂低碳运行措施及效果

以华中地区某污水处理厂 (设计规模：25×10⁴ m³·d⁻¹) 为例，分析城镇污水处理厂的节能降碳的有效措施。该厂在2021年底实施了系列节能高效运行和工艺优化创新措施，取得显著降碳效果。措施包括：采用节能高效设备、生化池按需曝气、光伏发电等节约电耗措施，以及强化生物除磷、优化化学除磷、多点配水节约碳源、智能加药等。对比分析该污水处理厂2022年的运行数据与2019—2021年的数据。年平均吨水电耗、吨水消耗碳源、吨水消耗除磷剂分别由0.192 kW·h·m⁻³、5.010 mg·L⁻¹ 、4.199 mg·L⁻¹降至0.161 kW·h·m⁻³、0 mg·L⁻¹、2.980 mg·L⁻¹。污水处理厂年消耗电费、药费等直接运行成本节约39.6%, 间接碳排放强度减少20.3%。相关举措可为类似污水处理厂的从运行管理角度实现减污降碳协同增效提供参考。

Low-carbon operation measures and analysis of the effects in a sewage treatment plant in Central China

Take a sewage treatment plant in Central China (design scale: 25 × 104 m3·d−1) as an example, the effective measures of energy saving and carbon reduction in urban sewage treatment plants were analyzed. At the end of 2021, the plant achieved significant carbon reduction effects by implementing a series of energy-saving and efficient operation and process optimization innovation measures including adopting energy-saving and efficient equipment, on-demand aeration in biochemical tanks, photovoltaic power generation, and other energy-saving measures, as well as strengthening biological phosphorus removal, optimizing chemical phosphorus removal, multi-point water distribution to save carbon sources, and intelligent dosing.The operation data of the wastewater treatment plant in 2022 and the data from 2019 to 2021 were compared and analyzed. The average annual electricity consumption per ton of water, carbon source consumption per ton of water, and phosphorus removal agent consumption per ton of water of this sewage treatment plant decreased from 0.192 kWh·m−3, 5.010 mg·L−1, 4.199 mg·L−1 to 0.161 kWh·m−3, 0 mg·L−1, 2.980 mg·L−1, respectively. The direct operating costs of the sewage treatment plant, such as electricity and medicine costs, were saved by 39.6%, and the indirect carbon emission intensity was reduced by 20.3%. Relevant measures proposedin this article can provide ideas for similar ennergy treatment plants to achieve synergies in reducing pollution can carbon.