摘要
我国污水处理行业碳排放量占全国总排放量的1.0%~3.0%,在碳中和的大趋势下,需要充分挖掘污水中蕴含的潜能,实现污水处理的能量自持。污水中化学需氧量(COD)对应有机物含有大量化学能,COD为1 mg/L时每m^(3)污水含化学能约16.2 kJ,是污水能源利用的主要途径。国内外学者对以碳捕捉及碳源改向为基础的新型吸附生物降解(AB)工艺进行研究,提出各自的能量平衡或碳中和技术路线。以进水COD为500 mg/L进行理论计算,基于AB工艺+厌氧消化+热电联产(CHP)工艺路线,计算得每m3污水发电潜能约0.340 kW·h,可实现污水处理厂运行的能量自持。污水处理厂引入水源热泵和光伏发电也是实现能量自持的重要补充手段。污水所含余温热能只能通过水源热泵转换为约60℃的低品位热源,不能直接用于发电。污水处理厂利用光伏发电可补偿约10.0%的能耗。
China's sewage treatment industry carbon emissions accounted for 1.0%~3.0%of the total emissions.Under the trend of carbon neutralization,it is necessary to fully tap the potential of sewage and realize the energy self-sustaining of sewage treatment.Chemical oxygen demand(COD)in wastewater contains a large amount of chemical energy.When COD is 1 mg/L,the chemical energy in 1 m^(3) wastewater is about 16.2 kJ,which is the main way of sewage energy utilization.Scholars in China and abroad have studied the new AB process based on carbon capture and carbon source modification,and proposed various characteristic energy balance or carbon neutralization technology routes.The theoretical calculation was carried out with the influent COD of 500 mg/L.Based on the AB process+anaerobic digestion+CHP power generation process,the power generation potential of 1 m^(3) wastewater was calculated to be about 0.340 kW·h,which can realize the energy self-sustaining of the operation of the wastewater treatment plant.In addition,the introduction of water source heat pump and photovoltaic power generation in sewage treatment plants is also an important supplementary means to realize energy self-sustainment.The waste heat contained in sewage can only be converted to a low grade heat source of about 60℃ by water source heat pump,which cannot be directly used for power generation.Wastewater treatment plants use photovoltaic power generation to compensate for about 10.0%of energy consumption.
作者
梁远
付岩峰
方小锋
成红燕
孟春霖
颜莹莹
陈北洋
LIANG Yuan;FU Yanfeng;FANG Xiaofeng;CHENG Hongyan;MENG Chunlin;YAN Yingying;CHEN Beiyang(Beijing Capital Sludge Company Limited,Beijing 100044,China;Huadian Water Technology Company Limited,Beijing 100070,China;Beijing Capital Company Limited,Beijing 100044,China)
出处
《华电技术》
CAS
2021年第6期55-60,共6页
HUADIAN TECHNOLOGY
基金
中国水协团体标准制订计划项目(ZGSX-TBJH2021)
中国华电集团科技项目(CHDKJ21-01-52)。
关键词
碳中和
吸附-生物降解
化学需氧量
热电联产
水源热泵
光伏发电
carbon neutral
adsorption-biodegradation process
chemical oxygen demand
combined heat and power
water source heat pump
solar power
