论文部分内容阅读
接触氧化过滤工艺普遍用于去除地下水中的氨氮,在去除地表水中氨氮的应用较少。为了对此工艺去除地表水中的氨氮进行研究,以附有铁锰氧化物的石英砂为滤料填充滤柱,测试了滤柱对地表水中的铁、锰和氨氮的去除效果,并重点分析了影响氨氮去除的主要因素。结果表明:当滤速为8 m·h-1,进水铁、锰、氨氮浓度分别为0.6、1.1和1.8 mg·L~(-1)时,滤柱对3种污染物的去除率分别为83.3%,95.3%和80.6%,3种污染物的出水浓度均达标。此外,升高进水温度、提高进水碱度可增大氨氮的去除率。当温度由8℃增大到14℃时,氨氮去除率提高了近一倍。进水投加NaOH(浓度为4mg·L~(-1))时,氨氮的平均去除率比不投加NaOH时高23.1%。
The contact oxidation filtration process is generally used to remove ammonia nitrogen from groundwater, and there is less application of ammonia nitrogen in surface water removal. In order to study the removal of ammonia nitrogen in surface water for this process, quartz sand with iron-manganese oxide as the filter material was used to fill the filter column, and the removal effect of iron, manganese and ammonia nitrogen in surface water on the filter column was tested. The main factors affecting the removal of ammonia nitrogen. The results showed that when the filtration rate was 8 m·h-1 and the influent iron, manganese, and ammonia nitrogen concentrations were 0.6, 1.1, and 1.8 mg·L-1, respectively, the removal rates of the three kinds of pollutants in the filter column were respectively For 83.3%, 95.3% and 80.6%, the effluent concentrations of the three pollutants met the standard. In addition, increasing the inlet temperature and increasing the alkalinity of the incoming water can increase the removal rate of ammonia nitrogen. When the temperature increases from 8°C to 14°C, the removal rate of ammonia nitrogen nearly doubles. When NaOH (concentration was 4 mg·L -1 ) was added to the feed water, the average removal rate of ammonia nitrogen was 23.1% higher than that when NaOH was not added.