SEUE-WAO污泥湿式氧化工艺的生产性试验研究

Full-scale Study on SEUE-WAO Sludge Wet Air Oxidation Process

研究开发了一种新型的污泥湿式氧化处理工艺即SEUE-WAO工艺,并开展了规模为25 t/d(污泥含水率为80%)的生产性试验。该工艺在高温、高压、富氧环境下对微生物细胞进行破壁,使得有机物发生水解和氧化反应而生成小分子有机酸、CO_(2)和水,从而实现污泥的减量化、无害化和稳定化;通过换热反应一体化技术深度回收反应热量,电耗≤60 kW·h/t(以湿泥计),在不添加化学药剂的情况下脱水泥饼含水率<35%。同时,脱水泥饼的处置路径灵活性强,可用于园林绿化以及包装类纸板、陶粒和制砖等建材生产的原料添加物,也可以用于焚烧;分离液具有用作污水处理厂反硝化碳源的潜力。生产性试验证明,该工艺具有超低能耗、安全可靠性高、环境友好、处理周期短、占地面积小、碳减排显著等优点。

This paper developed a new sludge wet air oxidation process,namely SEUE-WAO process,and carried out a production test with scale of 25 t/d(sludge moisture content was 80%).The process broke the microbial cell walls in high temperature,high pressure and oxygen-rich environment,resulting in the hydrolysis and oxidation of organic matters to generate small molecular organic acids,CO_(2)and water,so as to achieve the reduction,harmlessness and stabilization of sludge.The reaction heat was deeply recovered through the integrated heat exchange-reaction technology.The power consumption was less than 60 kW·h/t,and the moisture content of the dewatered sludge cake was decreased to less than 35%without adding chemical agents.The disposal method of the sludge cake was flexible,which could be used for landscaping and incineration,and used as raw material additives for the production of packaging cardboard and building materials such as ceramsite and brick.The separation liquid had the potential to be used as denitrifying carbon sources in wastewater treatment plants.The production test showed that the process had the advantages of ultra-low energy consumption,high safety and reliability,environmental friendliness,short treatment cycle,small footprint area and significant carbon emission reduction.