典型抗生素在不同组合基质中的去除效果

为筛选对抗生素处理效果好的组合基质,设计4种基质柱,研究了连续进水条件下典型抗生素在基质柱中的处理效果.结果表明,4种基质柱对恩诺沙星、磺胺二甲基嘧啶、土霉素和青霉素4种典型抗生素均有去除作用,去除率最高的是B柱.对于恩诺沙星和土霉素,第5d去除率最高;对于磺胺二甲基嘧啶和青霉素,第30 d去除率最高.恩诺沙星易被基质吸附,主要在各个基质柱的表层基质去除,而不易被微生物降解.磺胺二甲基嘧啶与基质发生吸附作用较小,pH值较高时吸附作用更弱,在基质中较易向下迁移,可被微生物降解.土霉素在中层和底层基质中的去除率占整体去除率的百分比较大,而微生物降解作用很小.青霉素在B柱表层和D柱中层基质中去除率较高,较易被微生物降解.B柱对4种抗生素的去除效果最好,其次是D柱,而A柱和C柱去除效果均不太理想.

Removal of typical antibiotics in simulation systems with different substrates

The research aimed at selecting the substrates combination that could remove antibiotics furthest. Removal of typical antibiotics were studied under the condition of successive influent in four simulation systems with different substrates. Experimental results showed that a part of enrofloxacin, sulfamethazine, oxytetracycline and penicillin were removed through four columns, and the removal rate of column B was highest. For enrofloxacin and oxytetracycline, the removal rate on the fifth day was higher than those on the tenth day and thirtieth day. Nevertheless, for oxytetracycline and penicillin, the removal rate on the thirtyth day was higher. Enrofloxacin was readily absorbed by substrates and not susceptible to microbial degradation, and its removal happened in surface substrate mostly.Absorption between sulfamethazine and substracte was little, and became less when pH value was higher. Sulfamethazine was readily to move downward in substrate and could be biodegraded. The removal rate of oxytetracycline in middle and bottom layer took very heavy proportion in the total removal rate, and biodegration happened barely. Penicillin was removed mainly in surface substrate of column B and middle substrate of column D, and was easily to be biodegraded. The removal effect of column B was best, and that of column D was second best, but that of column A and C were not satisfactory.