NH4^＋-N与N02^- -N对连续流CANON反应器运行性能的影响

摘要

To increase the TN （total inorganic nitrogen） removal efficiency, a CANON （completely autotrophic nitrogen-removal over nitrite） reactor, which started directly under aerobic conditions in the laboratory was used. The temperature was controlled at 35℃ ±1℃ , aeration rate was 31.2 m^3/（ m^3·h） , dissolved oxygen was about 1.5 - 2.0 mg/L, hydraulic retention time was 3.7 h respectively. Tests of ammonium and nitrite concentration on performance of CANON reactor were conducted. It is found that when the aeration rate is kept stable, it is not suitable to obtain high TN removal rate when the ammonium concentration is too high or too low. When the ammonium concentration is about 310 - 360 mg/L, a TN removal rate of more than 75% is gained under the above-mentioned conditions. Increasing the concentration of ammonium and nitrite in the reactor is beneficial to improve the TN removal load until both concentrations of ammonium and nitrite is more than 50 mg/L. When the CANON reactor is used to treat ammonium-rich wastewater without any organic carbon, the TN concentration in effluent is still high, and a further step is necessary to meet discharge standards.%为提高CANON反应器的TN去除效率，采用在好氧条件下直接启动的CANON反应器进行试验．试验过程中，控制温度在35℃±1℃、pH在7．39～8．01、曝气量为31．2m^3／（m^3·h）、P（DO）约1．5—2．0mg／L，水力停留时间为3．7h，分别进行了P（NH4^＋-N）与P（NO2^- -N）的试验．试验发现，在曝气量恒定的条件下，P（NH4^＋-N）过高或过低都不利于TN去除率的提高，在上述试验条件下，当P（NH4^＋-N）为310～360mg／L时，获得超过75％的TN去除率．提高反应器中