An experiment was carried out to investigate the anti-ammonium shock load capacity of a biological aerated filter （BAF） composed of a double-layer bed. This bed was made up of a top layer of ceramic and a bottom lay...An experiment was carried out to investigate the anti-ammonium shock load capacity of a biological aerated filter （BAF） composed of a double-layer bed. This bed was made up of a top layer of ceramic and a bottom layer of zeolite. The experiment shows that the anti-ammonium shock load process can be divided into two processes： adsorption and release. In the adsorption process, the total removal efficiency of ammonia nitrogen by zeolite and ceramic was 94%. In the release process, the ammonia nitrogen concentration increased significantly and then gradually returned to the normal level four hours after the shock load. The results indicated that the double-layer BAF had a high level of adaptability to the short-term ammonium shock load and long-term operation. The main factors influencing the dynamic process of ammonia nitrogen adsorption were the filter bed height, ammonia nitrogen concentration of influent, and flow rate. The bed depth service time （BDST） model was used to predict the relationship between the filter bed height and breakthrough time at different flow rates, and the results are reliable.展开更多
采用排污系数法估算了2016—2018年青海湖流域四县(共和县、天峻县、刚察县、海晏县)来自面源污染源(生活源、养殖业、种植业)总氮(TN)和氨氮(NH_(3)-N)入湖负荷。结果表明:青海湖流域入湖总氮负荷从2016年的2302.2 t N a,增加到2018年...采用排污系数法估算了2016—2018年青海湖流域四县(共和县、天峻县、刚察县、海晏县)来自面源污染源(生活源、养殖业、种植业)总氮(TN)和氨氮(NH_(3)-N)入湖负荷。结果表明:青海湖流域入湖总氮负荷从2016年的2302.2 t N a,增加到2018年的2453.2 t N a;共和县、天峻县、刚察县和海晏县分别占总负荷23.0%~23.2%、21.7%~23.7%、36.6%~38.4%和15.2%~15.7%。入湖氨氮负荷从2016年的164.4 t N a,增加到2018年170.6 t N a;共和县、天峻县、刚察县和海晏县分别占总负荷17.3%~18.0%、21.7%~24.0%、49.1%~50.7%和9.6%~10.0%。总氮和氨氮入湖负荷均以养殖业占比最高。因此,应重点加强青海湖流域刚察县养殖业面源污染控制。建议通过优化养殖业空间布局,推广适度集约化养殖模式,推动粪污全量资源化,建设生态拦截带,防控粪氨挥发等举措控制青海湖流域养殖业对湖体氮输入。展开更多
基金supported by the Major Science and Technology Program for Water Pollution Control and Treatment of China(Grant No.2009ZX07317)
文摘An experiment was carried out to investigate the anti-ammonium shock load capacity of a biological aerated filter （BAF） composed of a double-layer bed. This bed was made up of a top layer of ceramic and a bottom layer of zeolite. The experiment shows that the anti-ammonium shock load process can be divided into two processes： adsorption and release. In the adsorption process, the total removal efficiency of ammonia nitrogen by zeolite and ceramic was 94%. In the release process, the ammonia nitrogen concentration increased significantly and then gradually returned to the normal level four hours after the shock load. The results indicated that the double-layer BAF had a high level of adaptability to the short-term ammonium shock load and long-term operation. The main factors influencing the dynamic process of ammonia nitrogen adsorption were the filter bed height, ammonia nitrogen concentration of influent, and flow rate. The bed depth service time （BDST） model was used to predict the relationship between the filter bed height and breakthrough time at different flow rates, and the results are reliable.
文摘采用排污系数法估算了2016—2018年青海湖流域四县(共和县、天峻县、刚察县、海晏县)来自面源污染源(生活源、养殖业、种植业)总氮(TN)和氨氮(NH_(3)-N)入湖负荷。结果表明:青海湖流域入湖总氮负荷从2016年的2302.2 t N a,增加到2018年的2453.2 t N a;共和县、天峻县、刚察县和海晏县分别占总负荷23.0%~23.2%、21.7%~23.7%、36.6%~38.4%和15.2%~15.7%。入湖氨氮负荷从2016年的164.4 t N a,增加到2018年170.6 t N a;共和县、天峻县、刚察县和海晏县分别占总负荷17.3%~18.0%、21.7%~24.0%、49.1%~50.7%和9.6%~10.0%。总氮和氨氮入湖负荷均以养殖业占比最高。因此,应重点加强青海湖流域刚察县养殖业面源污染控制。建议通过优化养殖业空间布局,推广适度集约化养殖模式,推动粪污全量资源化,建设生态拦截带,防控粪氨挥发等举措控制青海湖流域养殖业对湖体氮输入。
文摘[目的]为城市污水处理厂的优化脱氮和节能运行提供参考。[方法]采用有效容积为240 L的中试Carrousel氧化沟处理模拟生活污水,研究溶解氧、进水COD负荷和进水氨氮负荷对Carrousel氧化沟同步硝化反硝化的影响。[结果]综合氨氮和总氮的去除率,能够满足同步硝化反硝化的最佳溶解氧浓度为1.0 mg/L,最佳进水COD负荷为0.25 kg COD/(kgMLSS.d)。较小的进水氨氮负荷有利于同步硝化反硝化过程的进行。[结论]溶解氧是控制氧化沟内发生同步硝化反硝化过程的最关键的因素。进水COD负荷对同步硝化反硝化过程的影响主要是体现在进水COD负荷对实现较好硝化效果的限制。
