MBBR中HRT与pH对短程硝化反硝化的影响

为了开发经济高效的生物脱氮工艺,在MBBR中进行了短程硝化反硝化的研究,考察了HRT与pH对短程硝化反硝化的影响。结果表明,在短程硝化反硝化过程中,在室温、不控制溶解氧的条件下,NH_4~+-N与COD去除率随着HRT的延长而增大,出水NO_2~--N随着HRT的延长先增大后减少,当HRT为8h时出水NO_2~--N最高;当pH由5增加到10时,COD去除率的变化较小,NH_4~+-N去除率和出水NO_2~--N则随着pH的增大先增大后减小,pH在8~9时对NH_4~+-N的处理效果最好,出水NO_2~--N最高。

Influences of hydraulic retention time (HRT) and pH on shortcut nitrification and denitrification in the moving bed biofilm reactor (MBBR)

In order to develop an economical and efficient biological nitrogen removing process,the research on shor-tcut nitrification and denitrification has been conducted in MBBR ,and the influences of HRT and pH on shortcut nitrification and denitrification have been investigated. The results show that in the process of shortcut nitrification and denitrification,under the following conditions:at room temperature and without dissolved oxygen control,the re-moving rates of NH4+-N and COD increase with the lengthening of HRT,and effluent NO2--N increases first and then decreases with the lengthening of HRT. The effluent NO2--N is the highest,when HRT is 8 h. The COD removing rate does not change much,when pH increases from 5 to 10. The removing rate of NH4+-N and effluent NO2--N in-crease first and then decrease with the increase of pH. The treatment effect on NH4+-N is the best and effluent NO2--N is the highest,when pH is 8-9.