The Promoting Effect and Mechanism of Nitrogen Conversion in the Sediments of Polluted Lake on the Degradation of Organic Pollutants
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摘要: 目前有关硝化反应动力学及其共代谢降解有机污染物的研究多为实验室微生物纯培养体系，来源于野外环境样品的很少.以受污染湖泊严家湖1号塘沉积物为研究对象，野外钻探采样，并选取不同深度沉积物进行室内外加氮源的硝化实验.结果表明：表层土和钻井一处50~100 cm沉积物发生明显的硝化反应，同时有机污染物中六氯苯含量降低最多，分别降低36.6%和49.4%，可以考虑从这两处沉积物中筛选硝化反应和六氯苯共代谢微生物.钻井一处250~300 cm和钻井二处150~200 cm沉积物未检测到明显硝化过程，但存在氨氮吸附和作为氮源被利用等过程使氨氮浓度下降；γ-六六六、环氧七氯和异狄氏剂酮含量在钻井一处250~300 cm分别下降48.8%、90.2%和63.3%，在钻井二处150~200 cm分别下降55.8%、87.4%和32.1%，表明沉积物中外加氨氮可以促进有机污染物降解.Abstract: At present, the research on the nitrification kinetics and the degradation of organic pollutants by co-metabolism are mostly based on the pure culture system of microorganisms in laboratory, and few are derived from environmental samples in the field. The study took the sediments of No.1 Pond of Yanjia Lake as the research object. Through field drilling and sampling, different points are selected for nitrification experiments with adding ammonium. The results showed that the nitrification obvious occurred in the topsoil and the sediments at the depth of 50-100 cm of well 1. At the same time, the content of hexachlorobenzene in the organic pollutants decreased the most, by 36.6% and 49.4% respectively. It can be considered to screen nitrification and hexachlorobenzene co-metabolism microorganisms from these two sediments. No obvious nitrification process was detected in the sediments at the depth of 250-300 cm of well 1 and 150-200 cm of well 2, but there were processes such as ammonium adsorption and being used as nitrogen source to decrease ammonium concentration. The contents of r-HCH, heptachlor-epoxide and endrin Ketone at the depth of 250-300 cm of well 1 decreased by 48.8%, 90.2% and 63.3%, respectively, and those at the depth of 150-200 cm of well 2 decreased by 55.8%, 87.4% and 32.1%, respectively. It shows that adding ammonium to these sediments can promote the degradation of organic pollutants.
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Key words:
- polluted lake /
- sediments /
- nitrification /
- organic pollutants /
- hydrogeology
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图 3 钻井一和钻井二沉积物三氮初始含量
Fig. 3. The initial contents of ammonia, nitrite and nitrate in the sediments of well 1 and well 2
图 6 硝化实验结束后沉积物中NH3-N含量及硝化实验消耗NH3-N绝对量
Fig. 6. The content of NH3-N in sediments after the nitrification and the absolute amount of NH3-N consumed by the nitrification
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