官厅水库入库水生物接触A/O工艺低温试验研究

Study on Bio-Contact Oxidation A/O Process of Guanting Reservior Water Under Low Temperature

试验表明 ,生物接触A/O工艺可以在低温下稳定运行 ,对官厅水库入库水中NH+ 4 N有较好的去除效果 ,对COD、TN均有一定的去除效果 .当温度大幅下降时 ,在温度下降初期NH+ 4 N去除率明显下降 ,但经过一段时间后 ,NH+ 4 N去除率逐渐回升 ,并稳定在较高的去除率水平 .在本试验条件下 ,0～ 5℃时 ,进水NH+ 4 N为 10mg/L左右 ,NH+ 4 N去除率最终稳定在 95 %以上 ,出水NH+ 4 N稳定 <0 5mg/L .另外 ,温度变化对COD去除效果的影响不明显 .镜检结果表明 ,在 0～ 5℃条件下生物膜中的微生物仍具有较好的活性 .

The results of the experiments showed that biological contact A/O process could run steadily under low temperature and had better removal effect for ammonia nitrogen and had some removal effect for COD and TN from water of Guanting Reservoir. When the temperature dropped greatly, removal ratio of ammonia nitrogen dropped evidently, but gradually rose and remained at high removal level at last. Under the conditions of the experiment that the temperature was 0～5℃ and influent ammonia nitrogen was about 10mg/L, ammonia nitrogen removal rate remained more than 95% at last. The change of temperature had no evident influence on removal effect of COD . And the conclusion could be got by microscope that under the temperature at 0～5℃ the microorganism in the biofilm still had a good activity.