污水处理厂污泥处置减污降碳路径研究--以苏州工业园区污泥处置及资源化利用为例

Pathway research of pollution reduction and carbon emissions for sewage sludge disposal and resource utilization in wastewater treatment plants--Taking the sludge disposal and resource utilization project of Suzhou Industrial Park as an example

污泥的处理与处置已成为污水处理厂系统运行中最为复杂,且花费较高的部分之一。文章采用“产业协同、循环利用”新型模式处理污泥,利用热电厂的余热蒸汽干化污泥作为生物质能用于热电厂焚烧发电,产生的蒸汽冷凝水回到热电厂循环利用,焚烧产生的灰渣由水泥厂制成建筑辅材;生产过程中产生的污水、废气送回污水处理厂、热电厂进行处理达标排放。该技术路径实现了废水、废气达标排放,固废综合利用,余热回用及污泥热值充分利用,能最大限度地实现污泥的资源化、能源化利用,具有良好的环境效益和经济效益,是一种很好的减污降碳协同增效技术途径,在全国各大拥有或临近火电厂的工业园区均具有较好的推广价值。

Sludge treatment and disposal has become one of the most complex and expensive parts during the system operation in the sewage treatment plant.A new model of"industrial cooperation and recycling"was adopted to treat the sludge.Waste heat steam from thermal power plants was used to dry the sludge as biomass energy for incineration and power generation in thermal power plants.The generated steam condensate was recycled back to the thermal power plant,and the ash generated by incineration was made into building auxiliary materials by cement plants.The steam condensate generated was returned to the thermal power plant for recycling,and the ash generated from incineration was made into building auxiliary materials by the cement plant;The sewage and exhaust gas generated during the production process was sent back to the sewage treatment plant and the thermal power plant for treatment and discharge up to standard.This technology path achieved the discharge standard of wastewater and exhaust gas,comprehensive utilization of the solid waste,the waste heat reuse,and full utilization of the sludge calorific value.It could maximize the resource utilization and energy utilization of the sludge and it was a good collaborative technology path for reducing pollution and carbon emission with an increasing efficiency.It had good environmental and economic benefits and had a good promotion value in major industrial parks with or near thermal power plants in the country.