芳香族化合物在人工湿地中的去除途径探讨
DISCUSSION ON AROMATIC COMPOUNDS REMOVAL PATHWAYS IN CONSTRUCTED WETLAND
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摘要: 芳香族化合物是一类对人体具有严重危害的持久性有机污染物(POPs),目前芳香族化合物的高级处理技术价格昂贵,难以推广。人工湿地由于低成本、低能耗、低运营维护的特点,被认为具有去除芳香族污染物的潜力。分析了芳香族化合物在人工湿地中的归宿,讨论了基质、植物、微生物与水解、光降解、挥发等方面的去除贡献大小,指出了目前研究中存在的不足,并展望了其未来发展方向。Abstract: Aromatic compounds,which will cause serious harms to human beings,are a group of persistent organic pollutants ( POPs) . At present,the high cost of the advanced aromatic compounds processing technologies makes the large-scale application of the technologies impossible. Constructed wetlands,which have the advantage of low-cost in construction,lowenergy in operation and easy maintenance,are attracting great concern on their capability of removing aromatic compounds from wastewater. This paper presented a review of current research situation and mechanism of aromatic compounds removal in the constructed wetlands,in which the substrates,plants and microorganism played the significant roles,while the hydrolysis, photodegradation,and volatilization were not major removal processes for most organic compounds. Therefore,future studies is probably to select the appropriate substrates and plants,gain an insight into the coupling mechanism of substrates,plants and microorganism,avoid short circuits as far as possible,obtain optimal contaminant-root contact,optimize the physico-chemical conditions in the rhizosphere,and enhance the microorganism activities to get higher removal efficiency.
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