低温条件下生物陶粒和活性炭两种超滤组合工艺处理微污染原水试验

Experiment of Micropolluted Raw Water Treatment by Two UF Combined Processes of Bio-Ceramsite and Activated Carbon under Low Temperature

针对北方某大型水厂微污染原水,研究低温条件下生物陶粒-浸没式超滤和颗粒活性炭-压力式超滤两种组合方式的运行效果及其特性。结果表明:10℃以上时,陶粒柱和炭柱对浑浊度的平均去除率分别为14%和31%;10℃以下时,陶粒柱和炭柱对浑浊度的平均去除率约为12%,对颗粒物的去除率分别超过22%和34%,对藻类数去除率分别为10%和27%;可见,颗粒活性炭的物理截留效果优于生物陶粒。随着温度的降低,陶粒柱和炭柱对CODMn的平均去除率分别从32%、19%下降到25%、16%;10℃以下时,对溶解性有机物的去除率仅为6%和2%。生物陶粒对微污染有机物的去除效果优于颗粒活性炭,但是低温对微生物的活性有较强的抑制作用。两种超滤膜对浑浊度的平均去除率超过85%,对<25μm颗粒的去除率均超过93%,对藻类的去除率均达到98%以上,CODMn的去除率在49%左右,没有明显差别,浸没式和压力式超滤膜对溶解性色氨酸类芳香族蛋白质有机物的去除率分别为8%和15%。

In view of micropollutedraw water of a large-scale water plant in North China,operation effect and characteristics of two combined modes of bio-ceramsite UF and GAC UFunder low temperature were studied.Results showed that when temperature was above 10℃,average removal rate of turbidity by bio-ceramsite and GAC were 14%and 31%respectively.Under 10℃,average removal rate of turbidity by bio-ceramsite and GAC was about 12%,while particles was more than 22%and 34%,and removal rate of algae was 10%and 27%respectively.It could be seen that physical retention effect of GAC was better than that of bio-ceramsite.With decrease of temperature,average removal rate of CODMn by bio-ceramsite and GAC decreased from 32%and 19%to 25%and 16%.Under 10℃,removal rate of dissolved organic matter was only 6%and 2%.Removal effect of bio-ceramsite on micropollutedorganic matter was better than GAC,but low temperature exhibited a strong inhibition on activity of microorganisms.Average removal rate of turbidity of two kinds of UF membrane was more than 85%,removal rate of particles less than 25μm was more than 93%,while algae was more than 98%,and CODMn was about 49%all the time,there was no significant difference.Besides,removal rate of tryptophan aromatic protein by submerged and pressured UF membrane were 8%and 15%respectively.