新型颗粒移动床连续过滤装置的特性研究

改变传统固定床过滤装置的间歇操作,降低过程能耗,集清洗洗涤器、三相分离器及滤料"反粒径"分布三项技术,开发了一种新型颗粒移动床连续过滤装置,讨论进气速率、清洗水速率以及移动床滤层更新速率之间的相互关系,探讨最佳运行条件.结果表明:进气速率和清洗水速率要有合适的比例才能保证装置稳定运行,连续操作的最佳气水体积比为7~12,此时移动床滤层更新速率很快,滤料循环最小周期只需12min;滤料由进水口到出水口粒径呈现由大到小的"反粒径"自然分布;随着处理负荷的增加,移动床比固定床有更好的出水水质;水力停留时间和进水浓度对出水效果和去除率具有很大的影响,浊度和化学需氧量的去除率最高可达88.89%和83.48%.

A New Type of Continuous Filtration Device with Particle-moving Bed and its Properties

In order to change the intermittent operation of the traditional fixed bed and reduce energy consumption, a new continuous filtration device with the particle moving bed was developed by integrating cleaning scrubbers, a three-phase separator and the filter ＂anti-particle size distribution＂ method. The relationship between the intake rate, the cleaning water rate and the updating rate of the moving bed filter layer were discussed, and the best operating conditions were explored. The results show that the intake rate and wash water rate should have an appropriate ratio in order to ensure the stable operation of the device. When the ratio of gas volume to water volume is 7 to 12, the continuous operation condition is best, and at this time, the moving bed filter layer updates fast. The filter cycle period only needs 12 rain. The filter aranges particles in antiparticle size natural distribution, so the particle size decreases from the inlet port to the outlet port. With the increase of processing load, the moving bed has better effluent quality than the fixed bed. HRT and the influent concentration have a great effect on the effluent quality and removal rate. The removing rate of turbidity and COD can reach as high as 88.89% and 83.48% respectively.