The Purification Research Of Benzene By Three Hydrophytes

In recent years, the economy of China has been developing rapidly, but the resulting environmental pollution has posed a serious threat to people, especially water environmental pollution, organic pollutants in industrial and agricultural sewage are usually toxic. Benzene is one of the common organic pollutants. It is reported that a variety of diseases caused by benzene poisoning are usually more severe and difficult to cure, thus, effective prevention and treatment of benzene pollution research is an important issue of environmental protection, because hydrophytes have the characteristics of easy collection and easy to culture, the technology of using hydrophytes to purify sewage has become an important means of sewage treatment.In order to evaluate the restorable effects of hydrophytes on benzene polluted water, three hydrophytes, Chara vulgaris, Nasturtium officinale and Potamogeton crispus, was researched on the benzene purification by L9(34) and L27(313) orthogonal design. The benzene solutions in the UV-Vis absorbance values were measured, then analyzed the results in accordance with the standards for the conversion of concentration.The results showed that five parameters, temperature, processing time, biomass, interaction between temperature and time, interaction between temperature and biomass, were significant in removing benzene by C vulgaris, temperature and biomass were significant in removing benzene by N. officinale, processing time was significant in removing benzene by P. crispus. The results showed the optimal combination of removing benzene by C. vulgaris is temperature18℃, processing time4h, biomass3g. The optimal combination of removing benzene by N. officinale is temperature18℃, processing time4h, biomass1g. The optimal combination of removing benzene by P. crispus is temperature8℃, processing time4h, biomass2g. The removal rates of three hydrophytes on benzene can reached to35.26%,69.71%and55.45%under optimal condition. All three hydrophytes can be used as the good materials for purifying water. C vulgaris and N. officinale may be suitable for use in summer and autumn; meanwhile, P. crispus is suitable for use in winter and spring.