摘要
试验以模拟生物滞留系统为研究对象,运用^(15)N同位素示踪技术研究土壤不同氧化还原电位(Eh)和p H条件下硝酸盐异化还原为氨(DNRA)作用对氮的去除效果。结果表明:在土壤Eh为225~100 m V、0^-120 m V和-225^-340 m V条件下,随着Eh的降低,硝酸盐异化还原为氨(DNRA)作用增强;生物滞留系统中同时存在反硝化反应和DNRA作用,在0^-120 m V区间,更有利于反硝化作用的发生;在-225^-340 m V区间,更有利于DNRA作用的发生;生物滞留系统土壤p H为5~7的条件下,DNRA作用效果随着p H的增加而增强;在p H为7~9时,DNRA作用效果随着p H的增加而减弱;表明DNRA作用易在中性偏碱性的环境下发生。
The effects of the dissimilatory nitrate reduction to ammonium process( DNRA) were studied on nitrogen removal under different soil Eh and p H conditions by using^(15)N isotope tracing technique in a simulated bioretention system. The results showed that the soil Eh conditions in the bioretention system were 225 ~ 100 m V,0 ^-120 m V and-225 ^-340 m V,the reaction of DNRA was stronger with the decrease of the redox potential,and the denitrification and DNRA reaction in the bioretention system were observed. In the treatment group of 0 ^-120 m V,the denitrification reaction is predominant. In the treatment group of-225 ^-340 m V,the effect of DNRA was more favorable. Under the condition of soil pH = 5 ~ 7,the effect of DNRA increased with the increase of p H. Under the condition of soil p H = 7 ~ 9,the effect of DNRA decreased with the increase of p H,indicating that DNRA was easily react in alkaline environment occurs.
出处
《科学技术与工程》
北大核心
2018年第4期368-373,共6页
Science Technology and Engineering
基金
国家自然科学基金(51408021)资助
