长江原水臭氧-生物活性炭挂膜中试研究

Pilot-scale study on biofilm formation in ozone-biological activated carbon process treating raw water from the Yangtze River

为了探究面向长江水源的臭氧-生物活性炭深度处理工艺的挂膜技术,进行了长江原水常州段的臭氧-生物活性炭挂膜中试研究.结果表明,在挂膜前期,由于炭柱的物理吸附作用逐渐饱和,炭柱对DOC(溶解性有机碳)、UV254和CODMn(高锰酸盐指数)的去除率逐渐降低,对氨氮几乎没有去除,在挂膜中后期,由于活性炭上生物膜逐渐成熟,生物降解起主导作用,有机物和氨氮去除率升高并趋于稳定.90 d后,炭柱对DOC、UV254和CODMn这3个有机物指标的去除率分别稳定在30.64%、57.50%和30.00%以上,氨氮去除率稳定在88.93%左右,认为挂膜成功.扫描电镜图显示活性炭表面出现丰富的菌胶团,同时高通量测序也验证了活性炭中丰富多样的微生物群落结构.

In order to explore the biofilm formation technology of ozone-biological activated carbon advanced treatment process for Yangtze River water, pilot-scale ozone-biological activated carbon biofilm formation technology in Changzhou section of Yangtze River was studied. The results show that the removal rates of DOC, UV254 and CODMn by activated carbon decrease gradually and ammonia nitrogen is hardly removed in the early stage of biofilm formation because of the saturation of physical adsorption of activated carbon. In the middle and late stage of biofilm-forming, biodegradation plays a dominant role. The removal rates of organic matter and ammonia nitrogen increase and tend to be stable due to the maturation of biofilm on activated carbon. After 90 days, the removal rates of DOC, UV254 and CODMn by activated carbon are over 30.64%, 57.50% and 30.00% respectively, and the removal rate of ammonia nitrogen is about 88.93%. It is considered that the biofilm formation has been successful. Scanning electron microscopy shows that there are abundant microbial micelles on the surface of activated carbon, and high throughput sequencing also verifies the rich and diverse microbial community structure in activated carbon.