生物电化学体系中三环唑的强化降解机制研究
毕业论文关键词 生物电化学系统，三环唑，生物毒性
Title Enhanced degradation of tricyclazole in Bioelectrochemical system
Abstract Tricyclazole has been widely used as a kind of efficient fungicide in agriculture industry. Tricyclazole-containing wastewater will pollute the water environment, do harm to animals and plants for its acute toxicity and high stability. Therefore, it is necessary to decrease the concentration of tricyclazole before discharging the tricyclazole-containing wastewater into water environment. Treatment of this wastewater has been a significant environmental concern. Traditional biological treatment for this wastewater is ineffective as tricyclazole is toxic to microorganism. Bioelectrochemical system, which has combined the advantages of electrochemical degradation and biodegradation, can degrade the bio-refractory contaminants by using bacteria catalyst. This system can be environmental-friendly, low-cost and easy to self-renew. Two kinds of BES system are constructed in this work. The degradation of tricyclazole in MFC cathode and anode is investigated respectively in this work. In addition, the influence of anode and applied power in UASB-BES system is investigated. And the toxicity of influent and effluent is used to evaluate the effect of BES system.
Keywords bioelectrochemical tricyclazole biotoxicity
目次
1绪论1
1.1三环唑的来源及危害1
1.2农药废水处理技术研究现状..1
1.3生物电化学法（BES）应用于废水处理的研究现状.1
1.4本文的研究背景、目的及意义1
2实验材料和方法2
2.1实验装置的构建2
2.2实验所用仪器及药品.1
2.3实验试剂2
2.4分析及表征方法2
3生物电化学系统降解三环唑效果研究1
3.1双室MFC反应器对三环唑降解效果分析.1
3.2无隔膜UASB-BES反应器（UBER）对三环唑降解效果分析1
3.3斑马鱼毒性试验1
3.4生物电化学系统降解三环唑效果评价1
结论.1
致谢.1
参考文献..1
1 绪论 1.1 三环唑的来源及危害 三环唑是一种用来预防和治疗水稻稻瘟病的高效內吸性杀菌剂，它的有效成分为 5-甲基-1,2,4-三唑并（3,4,-b）苯并噻唑，其分子式为 C9H7N3S，分子量为189.24，其结构式如下： 纯品为白色针状结晶，熔点为 187-188℃，25℃ 时的蒸汽压为2x10-7毫米汞柱，在水中溶解度为 700mg/L，能溶于有机溶剂，难溶于水。 三环唑属于中等毒性杀菌剂，能够迅速被植物根茎叶吸收，并输送到稻株的各个部分。该药的作用机理主要通过抑制附着孢黑色素的形成，来抑制孢子的萌发和附着孢的形成，阻止病菌侵入，减少稻瘟病菌孢子的形成。三环唑在动物 （小数）体内停留时间短，无蓄积作用。原粉对大鼠急性经口 LC50为305mg/kg，小鼠为 250mg/kg。对兔和大鼠急性经皮 LC50为＞2g/kg，大鼠急性吸入 LC50为＞0.25mg/L。三环唑在蔬菜上和稻谷上的最大允许残留限量（MRL）均为 2mg/Kg（GB2763-2012） 。 研究表明，三环唑具有生物毒性和诱变性，且在水中具有强稳定性，即使在很低的浓度下也会对动物和人类构成巨大的威胁[1]，因此含三环唑废水必须经过有效处理后才能排放。