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通过静态实验,探究阿特拉津含量对反硝化作用的影响以及固相反硝化对阿特拉津的去除机制。结果表明,质量浓度为1 mg/L和5 mg/L的阿特拉津对固相反硝化没有明显的影响,阿特拉津去除率分别为96.34%和86.72%;当阿特拉津的初始质量浓度达到10 mg/L时,硝态氮去除率略微下降了10%左右,阿特拉津的去除率下降迅速下降至62.33%。前期主要依靠稻草秸秆的吸附作用去除阿特拉津;随着稻草秸秆对阿特拉津的吸附达到了饱和,吸附作用趋于平缓,反硝化菌的生物作用开始显现。2种作用同时进行使得阿特拉津去除率最终达到90%以上。依靠吸附作用去除的阿特拉津始终占被去除总量的70%以上,说明固相反硝化系统对阿特拉津的去除主要依靠吸附作用。
Through static experiments, the effects of the content of atrazine on denitrification and the removal mechanism of atrazine by solid-state denitrification were explored. The results showed that atrazine with mass concentration of 1 mg / L and 5 mg / L had no obvious effect on the solid-phase denitrification, and the removal rates of atrazine were 96.34% and 86.72% respectively. When the initial When the mass concentration reached 10 mg / L, the removal rate of nitrate nitrogen decreased slightly by about 10% and the removal rate of atrazine decreased rapidly to 62.33%. In the early stage, the adsorption of atrazine mainly depends on the adsorption of straw straw. As the adsorption of straw on straw reaches saturation, the adsorption tends to be gentle and the biological effect of denitrifying bacteria begins to appear. At the same time, two kinds of effects make the removal rate of atrazine more than 90%. Atrazine removal by adsorption always accounted for more than 70% of the total removal, indicating that the removal of atrazine by the solid-phase denitrification system relies mainly on adsorption.