填料传质性能对污水生物反应处理工艺的影响研究

Study on the influence of mass transfer on the performance of a bio-reactor process for wastewater treatment

通过水力自旋填料与常规生物填料的对比试验,研究了传质性能对污水生物反应处理工艺的影响。结果表明:生物反应器内物系间的传质条件对氧传递效率有较大影响;SCMT型自旋传质填料良好的传质性能,能够创造理想的传质条件,使生物反应器内DO基本保持一致;使用SCMT型自旋传质填料生物反应器处理城市污水,可以在较短的停留时间(1.00h)或较小的气水比(体积比,4∶1)的情况下,出水水质达到《城镇污水处理厂污染物排放标准》(GB18918—2002)二级标准。

The influence of mass transfer on randomly packed bed bio-reactor process for wastewater treatment were explored through the comparison between a hydraulic rotated media （SCMT） vs. a traditional packing material. Experimental results showed that the SCMT packed bed increased the oxygen transfer capacity of the bioreactor significantly. With its better mass transfer characteristics, the SCMT media created higher dissolved oxygen environmental conditions in every spot of bio-reactor when compared with the traditional polypropylene ladder-circle packing, thus less resident time and energy were needed for equivalent removal efficiency, The secondary treatment standards ＂Municipal Wastewater Treatment Plant discharge Standard（GB 18918--2002）＂ can be reached by the SCMT packed bed under a condition of HRT= 1. 00 h or gas to liquid rate ratio of 4 ： 1.