铁碳填料的曝气生物滤池处理海水养殖废水的效能与机制OA

To solve the problem of poor effect of traditional biological treatment methods in treating mariculture tail water,a biological aerated filter(BAF)system was constructed with iron and carbon materials as fillers,the static pollutant adsorption characteristics of iron and carbon fillers were analyzed,and the effects of the system on nitrogen and phosphorus removal from mariculture wastewater with different hydraulic retention times and gas-to-water ratios were compared,and the mechanism of the system was explored.The results showed that compared with granular activated carbon(GAC)and ceramic FeC packing showed better static phosphate adsorption performance.The maximum phosphate adsorption capacity of FeC packing obtained from adsorption kinetic fitting and adsorption isotherm fitting was 1.80 and 1.69 mg·g-1,respectively.The optimal hydraulic retention time was 9 h,corresponding to the total nitrogen(TN)and total phosphorus(TP)removal rate of 58.00%and 93.65%.The optimal gas-to-water ratio was 5∶1,corresponding to the TN and TP removal rate of 60.43%and 93.64%.The X-ray diffraction characterization of the FeC filler before and after use showed that the co-precipitation of iron ions and other metal ions released by FeC filler with phosphate was the key mechanism for phosphorus removal.Comparison of the microbial community structure at the phylum level in ceramic BAF and iron-carbon BAF systems showed that FeC filler may promote the enrichment of functional bacteria related to denitrification and phosphorus removal in the system.