基于重力势能驱动的新型旋转移动床梯级净化工艺

结合山地村镇地势高差大的特点,根据水车的运行原理,构建了一套适用于山地村镇生活污水处理的新型旋转移动床梯级净化工艺。通过对复合式双旋转生物移动床进行清水复氧试验,发现其具有良好的曝气性能,跌水高度越高、跌水流量变化范围越小,复氧效果越好。稳定运行期间,对COD、NH_(4)^(+)-N、TN和TP的平均去除率分别为96.5%、91.7%、56.5%和17.5%,COD、NH_(4)^(+)-N和TN的出水浓度达到了重庆市《农村生活污水集中处理设施水污染物排放标准》(DB 50/848—2021)中的一级标准。由于工艺依托生物膜法实现营养物去除,TP去除效果较差。取复合式双旋转生物移动床中的填料进行硝化性能测试,硝化速率为6.058 mg/(gMLVSS·h),硝化活性较高。高通量测序结果显示,属水平上相对丰度排名前7的微生物均为好氧菌,说明复合式双旋转生物移动床良好的曝气效果对微生物群落起到了选择作用;与去除COD相关的菌属相对丰度之和为32.7%,与硝化有关的菌属相对丰度之和为21.5%。因该工艺整体不需要电能驱动,大大降低了运行成本。

Cake forming and filtering time in the spiral discharging fine coal filtering centrifuge

Based on the realization of moving-bed cake filtering, the concepts of static-bed filtering time and moving-bed fil- tering time in the helical-conveyor fine coal filtering centrifuge were proposed, and the mathematic relations between the time defined and the main factors related were studied in detail. The results show that the static-bed filtering time is the function of the spiral heads and the rotation rate deference between the spiral and the porous drum, while the moving-bed filtering time is the function of the cone angle of the porous drum, the radius of the porous drum, the spiral angle, and the rotation rate deference. The functions deduced are of great significance for fine coal filtering centrifuge＇s parameters determining and optimizing. It is shown that the filtering centrifuge with smaller spiral angle, smaller rotation rate deference, and smaller cone angle may do a better job for fine coal dewatering.