2种曝气生物滤池深度处理含CMC模拟退浆废水

Two kinds of BAFs advanced treating of stimulate desizing wastewater including CMC

采用陶粒滤料和活性炭滤料的2组曝气生物滤池(BAF)处理含CMC模拟退浆废水,在水力负荷0.071 m3·(m2·h)-1、水力停留时间24 h条件下,分析曝气生物滤池对COD、CMC和浊度去除效果和曝气强度对滤池运行的影响,研究滤柱高度方向污染物去除规律以及和微生物量、微生物活性间的关系。研究结果表明,随着气水比的增大,生物滤池对COD、CMC的去除效率增大,强烈的曝气作用会引起出水浊度增大。在气水比为4∶1的条件下,2组生物滤池对COD和CMC的平均去除率分别约为72%和65%、67%和62%。曝气生物滤池对COD、CMC、浊度的主要去除区域分别位于滤柱1.5、1.3和1.1 m高度以下区域。陶粒滤柱相对活性炭滤柱微生物量略高,两组滤池单位滤料微生物量和微生物脱氢酶活性沿滤柱高度方向变化趋势相似。两组滤池对CMC的去除主要依靠吸附作用,生物降解部分仅占CMC总去除率的34.7%和26.1%。

Two biological aerated filters （BAF） with ceramic filler and activated carbon filler, respective- ly, were applied to stimulate the treatment of desizing wastewater including CMC. Under a hydraulic loading of 0. 071 m3 · （m2 · h） -1 and hydraulic retention time （HRT） of 24 h, the removal effects of COD, CMC, and turbidity and the aeration intensity on BAF operation were investigated. In this paper, the relationship between pollutant removal, microbial biomass, and microbial activity along the height of the filter column are discussed. The results showed that the removal efficiency of COD and CMC increased with increases in gas-water ratio and intense aeration caused increases in effluent turbidity. When the gas-water ratio was 4： 1, the average removal rates of COD and CMC in the two fillers were about 72% and 65% , and 67% and 62% , respectively. The main regions of COD, CMC, and turbidity removal in the BAF were located in the filter column below heights of 1. 5, 1.3 and 1. 1 m. Microbial biomass in the ceramic filter was slightly higher than that in the activated carbon filter. The change trends of microbial biomass and microbial dehydrogenase activity along the height of the ceramic filter was similar to that in the activated carbon filter. The removal of CMC in these two filters mainly relied on bio- logical adsorption, and biodegradation accounted for only 34. 7% and 26. 1% of the total removal rate of CMC.