Mechanism Analysis Of Enhanced Biodegradation Of Environmental Estrogen In Soil-water System

Science proved more and more chemicals has the effect of environmental estrogens. The effect of environmental estrogen on human health and ecological environment system is concerned, and it poses a potential to human survival and environmental safety. Since the degradation of estrogen in the environment is influenced by several environmental factors, the degradation speed is slow and the efficiency is not high. This thesis will study how to promote the rapid and high efficiency degradation of estrogenic in the water, soil water system respectively. Selecting several method can promote the degradation and removal of environmental estrogen as the technical factors, make five kinds of environmental estrogen (E1, E2, E3, EE2, BPA) hybrid system as target pollutants, using a full factorial experimental design method and combining the multivariate linear regression model, to study the degradation rule that enhance the degradation of environmental estrogens through the analysis of main effects and interaction effects of multi technology factor system factor main effects and higher interaction effects.In the water medium, selecting soil, calcium alginate, rhamnolipid, ultrasound as technical factors. The study found that, for the target pollutants BPA, main effect of four kinds of technology factor and higher interaction effects affect the BPA degradation significantly. The main effect factors of soil=0.092, calcium alginate=0.018, rhamnolipid=0.014, ultrasonic=0.025, showed promoting effects to the degradation of BPA. The second order interaction effects mainly promote the degradation of BPA, in addition to degradation of soil*rhamnolipid=-0.0091, which inhibit the degradation of BPA, the promoting effects order was rhamnolipid*ultrasonic>. calcium alginate*rhamnolipid> calcium alginate*ultrasonic> ultrasonic*soil. The significant three order interaction effects of soil*calcium alginate*rhamnolipid=-0.021, calcium alginate*rhamnolipid*ultrasonic=-0.062, showed inhibitory effect. And the four order interaction effect is remarkable, showed a significant role in promoting the removal and degradation of BPA. For E2, the study found the main effect, second order and third order interaction effect were significant interaction effects. The main effects, soil, calcium alginate accelerates the degradation of BPA, with the increasing of concentration of rhamnolipid, the degradation of E2could be inhibited. The second order interaction effects which had significant effect on the degradation rate of E2were rhamnolipid*ultrasound, calcium alginate*ultrasound, soil*ultrasound and soil*rhamnolipid, the contribution rate of promoting effect was35.02%, while the effect calcium alginate*rhamnolipid inhibited the degradation of E2, and the contribution rate was3.68%.The third order interaction effects of alginate calcium*soil*rhamnolipid promote the degradation of E2, the contribution rate was3.13%, soil*calcium alginate*ultrasound and soil*rhamnolipid*ultrasound inhibited the degradation process of E2, the contribution rate of total inhibition of the contribution rate was54.7%.In soil water system, using MnO2, calcium alginate, rhamnolipid, ultrasonic as technology factors, EE2was the target pollutant. The study found, estimate of the main effect of MnO2is0.20311, indicating that, adding MnO2and the increasing dosage of MnO2promotes the degradation of EE2in estrogen-mixed system, rhamnolipid effect value is-0.01534, shows that increasing amount of rhamnolipid will decrease the degradation efficiency of EE2. The second order interaction effects which has significant influence on the degradation rate of EE2are calcium alginate*ultrasound, rhamnolipid*ultrasound, MnO2*rhamnolipid, MnO2*alginate calcium, the effect values calcium alginate*ultrasound, rhamnolipid*ultrasound, MnO2*ultrasonic value are positive, showed significantly promote the degradation of EE2in the estrogen mixture system, and the interaction between MnO2and calcium alginate inhibited EE2degradation. All the third order interaction effects affect the degradation of EE2on soil-water system, in which calcium alginate*rhamnolipid*ultrasonic=0.00728, significantly promote the degradation of EE2, the value of soil*calcium alginate*rhamnolipid is-0.01121, soil*calcium alginate*ultrasound is-0.04092and soil*rhamnolipid*ultrasound is-0.00568, indicated that the three interactive effect have significant inhibition to the degradation of EE2in soil-water system.