【摘要】 采用压力式接触氧化塔处理吡虫啉废水,并对其脱氮性能进行了试验研究。详细考察了溶解氧、容积负荷、废水含盐质量分数对氧化塔脱氮性能的影响,并对其脱氮机理进行了探讨。结果表明:当进水容积负荷(以COD计)<18.26 kg/(m3.d),NH3—N质量浓度为110 mg/L,总氮(TN)质量浓度为200 mg/L时,控制系统溶解氧的质量浓度为5.8 mg/L,压力为0.3 MPa,其COD去除率超过70%,NH3—N和TN去除率分别可达85%和80%;含盐质量分数的增加会抑制硝化菌的增殖;加压接触氧化塔在内部能够形成厌氧微环境,实现同步硝化反硝化。更多还原

【Abstract】 Pressurized bio-contact oxidation process was used for treating imidacloprid wastewater,and nitrogen removal characteristics were experimentally studied.The mechanism of simultaneous nitrification and denitrification(SND) was proposed.The effects of dissolved oxygen,organic loading rate and salt mass fraction on SND were investigated.The results demonstrate that the average removal efficiency of COD is more than 70%,and that of NH3—N and total nitrogen can reach 85% and 80% respectively when the influent of organic loading rate(as COD) is less than 18.26 kg/(m3·d),the mass concentrations of NH3—N,dissolved oxygen and total nitrogen are 110 mg/L,5.8 mg/L,200 mg/L,and pressure 0.3 MPa.Increasing salt mass fraction can inhibit the proliferation of nitrifying bacteria.The pressurized bio-contact oxidation process can build an anaerobic micro-environment and result in SND process.更多还原