UV/TiO_(2)光催化氧化技术降解颤藻及其毒素的研究

Degradation of Oscillatoria sp.and its toxins by UV/TiO_(2)

UV/TiO_(2)为非选择性高级氧化技术,对各类蓝藻均有降解能力,但其处理效果受蓝藻生理生化特性的影响。自然水体中往往存在多种有害蓝藻优势种,然而目前UV/TiO_(2)降解有害蓝藻的研究大多以铜绿微囊藻(Microcystis aeruginosa)为对象,对其他具有不同生理生化特性的蓝藻优势种的处理效果与机制研究仍鲜有报道。近年来,另一种常见的产毒蓝藻——颤藻(Oscillatoria sp.)在水源地的频繁暴发使其受到广泛关注并急需找到具有针对性的治理方法。为探索UV/TiO_(2)高级氧化技术治理水体中颤藻的可行性,针对UV/TiO_(2)降解过程中颤藻细胞的裂解机制、微囊藻毒素与柱孢藻毒素的降解效率以及胞外有机物的变化规律进行研究,并与同等条件下铜绿微囊藻的降解过程进行比较。

UV/TiO_(2)is a non-selective advanced oxidation technology,which can degrade all kinds of cyanobacteria.However,its treatment effect is affected by the physiological and biochemical characteristics of the cyanobacteria.There are many dominant species of harmful cyanobacteria in natural water.The present research on the degradation of harmful cyanobacteria by UV/TiO_(2)is mostly focused on Microcystis aeruginosa,and there are still few reports on the treatment effect and mechanism of other dominant species of cyanobacteria with different physiological and biochemical characteristics.In recent years,the frequent outbreak of Oscillatoria sp.,another common poisonous cyanobacteria,has attracted widespread attention and urgently needs to find a targeted treatment method.To explore the feasibility of UV/TiO_(2)advanced oxidation technology to treat Oscillatoria in water,this paper focuses on the lysis pattern of Chlamydomonas cells during UV/TiO_(2)degradation,the degradation efficiency of microcystins and columnaris toxins,and the types and contents of extracellular organic matter.The changes of Microcystis aeruginosa under the same conditions are also analyzed.