湿式低温等离子体原子级催化脱除污泥干化废气中NH3、H2S及VOCs的研究

The sludge drying waste gas of the wastewater treatment plant contains NH3, H2S, VOCs and various other malodorous pollutants, which seriously pollute the air environment. Conventional process usually combines absorption with biological and combustion methods, and there are many problems such as long processing time, huge system complexity, chemical by-products, so it is difficult to achieve collaborative control. This project presents the wet low temperature plasma atomic level catalysis technology: 1)build a low temperature plasma single atom catalytic module; 2)combine the module with the absorption solution in order to construct a wet low temperature plasma catalytic tower; 3)the absorption solution is recycled by elongated arc discharge plasma in order to realize "one tower removal" of the multi-pollutants such as NH3, H2S and VOCs. The law of wet low temperature plasma atomic level catalysis for removing NH3, H2S and VOCs is mainly studied, and the atomic synergistic effect of plasma catalysis and the law of rapid oxidation regeneration of absorption solution are analyzed; It is expected that the removal rate of NH3 and H2S is over 90%, and the removal rate of VOCs is over 95%. This technique is easy to realize the integration of scale enlargement and integrated efficient removal of the multi-pollutants, enriching the method of producing low temperature plasma and the application of plasma electronics in the environmental engineering.

城市污水厂污泥干化废气中含有NH3、H2S、VOCs等多种恶臭污染物，严重污染大气环境。常规处理方法通常将吸收法、生物法、燃烧法联合起来，存在处理时间长、系统庞大复杂、化学副产物等问题，难以实现协同控制。本项目提出了湿式低温等离子体原子级催化技术：1）构筑低温等离子体单原子催化模块；2）将模块与吸收液联合，构建出湿式低温等离子体催化塔；3）吸收液通过放弧等离子体再生循环使用，实现“一塔”脱除NH3、H2S及VOCs等多种污染物。主要研究湿式等离子体单原子催化氧化NH3、H2S及VOCs的规律，解析等离子体催化的原子级协同效应；吸收液快速等离子体氧化再生规律，有望实现NH3、H2S脱除率达90%以上，VOCs脱除率达95%以上。此技术容易实现等离子体规模放大和一体化高效脱除多种污染物，丰富了低温等离子体产生方法及等离子体电子学在环境工程中的应用。

为了处理含有NH3、H2S、VOCs等多种恶臭污染物的污泥干化恶臭废气，本项目建立了湿式低温等离子体原子级催化技术，构筑出低温等离子体单原子催化模块；构建出湿式低温等离子体催化塔；实现了“一塔”脱除NH3、H2S及VOCs等多种污染物。本项目解析出等离子体催化氧化NH3、H2S及VOCs的规律，吸收液等离子体氧化再生规律，最佳工况实现了NH3、H2S脱除率达90%以上，VOCs脱除率达95%以上。本项目按时完成了预定的目标，发表期刊论文12篇，其中SCI论文6 篇，EI论文3 篇；申请发明专利4项，授权发明专利1项；出版专著1本。