碳中和目标下污水处理厂提标升级浅析

A Brief Analysis of the Upgrading of Sewage Treatment Plants under the Carbon Neutrality Goal

在碳中和目标下,通过对华中地区某污水处理厂改造升级后的工艺处理状况进行分析,其COD、NH_(3)-N、TN和TP的浓度分别从138.72 mg/L、15.17 mg/L、21.24 mg/L、1.97 mg/L降低到15.16 mg/L、0.38 mg/L、11.88 mg/L、0.22 mg/L,采取多级AAO工艺和多点进水的方式不仅提高污染物的去除效率,并且充分利用进水中的有机碳源减少成本。改良工艺后的月均处理水量增加了约21%,但月均综合电耗降低了约25%,较大程度上减少碳排放量。但在能源回收以及碳中和方面还有所不足,当地夏季高温,冬夏温差较大,夏冬两季制冷和供暖为刚需,可考虑污水余温热能回收利用;同时,在构筑物上铺设太阳能光伏板收集太阳能转化为电能供给厂内生产运行,进一步进行能量补偿以实现能源自给。

Under the carbon neutrality goal,this paper analyzes the process treatment status after the upgrading of a sewage treatment plant in central China.The COD,NH_(3)-N,TN,and TP contents were reduced from 138.72 mg/L,15.17 mg/L,21.24 mg/L,and 1.97 mg/L to 15.16 mg/L,0.38 mg/L,11.88 mg/L,and 0.22 mg/L.The adoption of a multi-stage AAO process and multi-point water inlet not only improves the removal eff iciency of pollutants but also fully utilizes the organic carbon source in the influent to reduce costs.After the process improvement,the average monthly treatment capacity increased by approximately 21%,while the average monthly comprehensive power consumption decreased by approximately 25%,signif icantly reducing carbon emissions.However,there are still some def iciencies in energy recovery and carbon neutrality.Due to the high summer temperature and large temperature difference between summer and winter in the local area,refrigeration and heating are rigid demands in summer and winter,and the recovery and utilization of sewage residual heat energy can be considered.At the same time,solar photovoltaic panels can be installed on structures to collect solar energy and convert it into electrical energy to supply the plant’s production and operation,further compensating for energy to achieve energy self-suff iciency.