污水土壤渗滤系统氧化亚氮释放通量与主导因子

Flux and dominant factors of nitrous oxide release in wastewater land infiltration systems

在生物、物理、物化的联合作用下,土壤渗滤系统对污水具有深度净化能力.在生物脱氮过程中,温室气体之一的氧化亚氮是主要副产物.文中在分析土壤渗滤系统氧化亚氮产生机理的基础上,探讨了渗滤系统结构特征、植物类型及温度变化等因素与氧化亚氮释放通量的响应关系,获取了主导氧化亚氮释放的参数条件.研究结果表明:作为一种生态法污水深度处理工艺,影响土壤渗滤系统氧化亚氮释放通量和转化率的因素多且复杂.未来工作应侧重于进一步阐释主导因子的交互作用对释放通量的影响,以及氧化亚氮的释放特征反作用于基质层微观结构、渗滤性、孔隙度及微生物结构的作用机理,结果将有助于优化运行参数和指导工程设计.

Under the combination actions of biological,physical and physiochemical processes,land infiltration systems have advanced wastewater treatment ability.During the complex process of biological metabolism,nitrous oxide(N 2O)will be released from the substrate bed resulting in block of the infiltration system and the destruction of atmospheric environment.This paper reviews the production mechanism of N 2O from wastewater land infiltration systems.Furthermore,the influence of factors(such as system type,plant and temperature variation)on N 2O releasing flux was summarized.The main parameters dominating N 2O release was obtained.Finally,the viewpoint was pointed out that as a kind of wastewater advanced treatment system,many complicated factors will affect N 2O releasing flux and conversion rate.Further research should put emphasis on combined functions of dominant factors and the mechanism of N 2O generation on matrix microstructure,permeability,porosity and microbial activity needs intensive studies.The results would be helpful for the operation parameter optimization and engineering design guide.