| Endocrine disruptor material is a kind of organic matters long-standing in the environment, known as "environmental hormone", usually in the form of mg/L or ng/L existing in water environment. Due to its long-term and chronic toxic effect effects to the human body, it has caused extensive concern for scientists of water quality. A large number of domestic scholars researched the rivers in China, and found that all kinds of endocrine disruptors are detected in most of the rivers. The source waters have been polluted, so removal of the endocrine disruptors is important. The main contents of this study included:This study chose 9 kinds of pesticides, endocrine disruptors, developed and optimized UPLC/MS/MS methods for detecting the 9 kinds of pesticide. The methods were verified, the linear correlation coefficient of standard curve between 0.99864 and 0.99982, all the recovery rate was from 82.5% to 112.8%, detection limit of 0.004 0.027 mg/L, quantitative limit of 0.013 to 0.013 mg/L. Pretreatment methods of pesticides in water samples and sediments were studied. The results showed that adding appropriate proportion of methanol could eliminate the influence of the matrix effect and adsorption in the whole detection process; Qu EChERS method recovery of all pesticides besides profenofos was higher than 55%.Based on the laboratory experimental water treatment devicer, the effect of coagulation-sedimentation with different recycling ratio(0, 2.5%, 5%, 2.5%) was studied. The results show that the water reuse reduced zeta potential of particles in mixed raw water and the recycled water, increase the colloid particle size in the coagulation process, promoting coagulation effect.The pesticide removal influence of raw water with 10, 25, 50 NTU was studied, the results show that increasing raw water turbidity, profenofos and prometryn concentration in raw water water was reduced, the rest of the pesticides had no effect; The concentrations of pesticides after sedimentation and filtration were almost unchanged under the condition of three different raw water turbidity.It studied eight kinds of pesticides(internal standard for Diuron) removal trend and mechanism of pesticides in different recycling ratios. The results show that the turbidity and NOM(UV254) had high removal efficiencies, with the increase of wastewater reuse ratio profenofos and prometryn concentration in raw water was reduced, atrazine, pirimicarb and cyanazine concentration increased, the S-metolachlor, propazine and fenobucarb concentration changed slightly. Concentration of the 8 kinds of pesticides in settled and filter water was also different, effluent concentration of profenofos after sedimentation with high logKow maintained at 3.5 to 4.0 mg/L, while in filtered water concentration was below 1 mg/L. Atrazine, pirimicarb and cyanazine with low log Kow, their effluent concentration of precipitation and filter water showed a increasing trend with the increasing recycling ratio, and effluent concentration of S-metolachlor, propazine, fenobucarb had little effect. The removal rate of profenofos was about 90%, prometryn was about 20%, others were lower than 10%.Detecting the content of 8 kinds of pesticides in the sediment by optimized QuEChERS method, the results showed that the lower centrifugal sludge, profenofos average content was 200.8 mg /g sludge, S-metolachlor average content was 59.16 mg / g sludge, the other material content in the sludge was about 20 mg /g sludge. Profenofos in Supernatant did not exist, the other seven kinds of pesticides concentration is 4.06mg/L- 13.29 mg/L. |
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