以琼脂凝胶为碳源和载体的水源水生物脱氮

BIOLOGICAL NITROGEN REMOVAL OF SOURCE WATER WITH AGAR GEL AS THE CARBON SOURCE AND CARRIER

针对受硝酸盐污染的水源水,建立了以琼脂凝胶为反硝化菌的碳源和微生物载体的反应器,通过生物反硝化作用去除水源水中的硝酸盐。试验结果表明,在水源水自然接种的条件下,通过微生物的驯化培养可以顺利启动琼脂凝胶反应器;系统的反硝化效果受水力停留时间(HRT)和进水DO质量浓度的影响较明显,进水NO3--N质量浓度对系统的反硝化能力有一定的影响,同时改变进水方式可以进一步提高反硝化效率;在温度为21～23℃、进水NO3--N质量浓度为24.74 mg.L-1、HRT为7.1 h、进水DO质量浓度不控制的条件下,NO3--N的去除率能达到76.25%,此时出水COD和NO2--N质量浓度分别为16.57 mg.L-1和0.387 mg.L-1。研究指出,琼脂凝胶生物反硝化系统能够有效地脱除水源水中的硝酸盐氮。

Aimed at the nitrate-polluted source water,the reactor with agar gel as the carbon source of denitrifying bacteria and the growth carrier of microbes was established to remove the nitrate in source water by the biological denitrification.The experimental results showed that the agar gel reactor started up successfully after microbial acclimation and culture when source water was used to inoculate the reactor.The hydraulic retention time（HRT） and influent DO concentration obviously affected the denitrification performances,the influent NO3——N concentration had influence on the denitrification capacities to a certain extent,and the denitrification efficiency could be further improved by altering the influent mode.The NO3——N removal efficiency,the effluent COD concentration and the effluent NO2——N concentration of the reactor were 76.25%,16.57 mg·L-1 and 0.387 mg·L-1 respectively,when the temperature was 21～23 ℃,the influent NO3——N concentration was 24.74 mg·L-1,and HRT was 7.1 h without control of influent DO concentration.This research indicated that the agar gel reactor could effectively remove the nitrate in source water.