石英砂表面活性滤膜去除地下水中氨氮的试验研究

为研究石英砂滤料表面活性滤膜催化氧化地下水中氨氮的性能,采用已运行4年的中试石英砂滤柱,改变进水氨氮负荷并且长期持续过滤仅含氨氮的进水,考察该滤膜催化氧化氨氮的性能.结果表明:在进水氨氮浓度为0.8~1.3mg/L,水温为20~23℃,滤速为7m/h的试验条件下,滤料表面活性滤膜催化氧化氨氮的性能可长期保持稳定、高效;在溶解氧(DO)充足的条件下,氨氮的最大去除负荷为22.3g/(m³·h),且其与氨氮进水负荷正相关;氨氮的极限去除浓度受溶解氧的限制,且当DO不足时,滤速对溶解氧的消耗影响较大.

Removal of ammonium from groundwater by a co-oxide filter film coating on quartz sands

To investigate catalytic oxidation of ammonium from groundwater by a co-oxide filter film coating on quartz sands, a pilot-scale filter which has been operated for about 4years was used, and varying inlet ammonia loads and the filter was operated under inlet water only containing ammonia for long term. Results showed that in the experimental conditions of the concentration of ammonia nitrogen was 0.8~1.3mg/L, the temperature of raw water was 20~23℃, and the flow rate was 7m/h, the performance of catalytic oxidation of ammonium of the co-oxide filter film remained stable and high-efficient for a long time. The maximum ammonium removal capacity of the filter was determined to be 22.2g NH₄⁺-N/(m³·h) with ammonium removal rate(ARR) determined by the ammonium loading rate(ALR) if the dissolved oxygen(DO) was enough. The maximum concentration of ammonia was limited by DO. When the DO in influent was not enough, flow rates had significant influence on consumption of dissolved oxygen along the filter layer.