| Based on the pollution of the drinking water which was affected by the pollution of the surface water,we explored the effects of the technology of simulated enhanced matrix vertical flow and the biological slow-damped artificial wetland system on the micro-polluted water.Moreover,we explored the preparation of graphene study on the removal effect of related materials on tetracycline-containing antibiotic wasted water.Firstly,the vertical flow of artificial wetland system under the high,medium and low hydraulic loads was studied.At the same time,we used hydrotalcite,bioactive charcoal and vermiculite as special substrates,and confirmed the vertical flow of artificial wetland system under the fittest hydraulic loads by analyzing the removal effect of the pollutants.Secondly,we discussed the removal efficiency of pollutants by three kinds of composite matrices under low and medium hydraulic loads,and the slow filtration wetland system with the best composite matrix.Lastly,the effects of modified graphene on the removal of tetracycline were studied and the mechanism and mechanism of the removal of tetracycline were studied by using thiourea dioxide as reducing agent.It showed as follow:?1?The removal rate of NH4+-N and COD were enhanced with the increased hydraulic load.However,the effluent concentrations of TN were 2.19 mg/L,1.77mg/L and 1.99 mg/L on average,under the high,medium and low hydraulic loads respectively,and the effluent quality of TN was poor,which was not up to the standard of the?water quality under low hydraulic load.?2?The average removal rates of NH4+-N,NO3--N,TN,TP and COD were more than 68.97%,43.91%,75.97%,76.51%and 68.42%respectively under the low hydraulic load and the three kinds of composite matrices in the continuous dredging artificial wetland system.The average removal rates of NH4+-N,NO3--N,TN,TP and COD were more than 78.19%,38.67%,76.22%,79.41%and 69.39%respectively under the high hydraulic load and three kinds of composite matrix systems.In general,the purification effects of different composite matrix system were that No.3?sand+coconut shell carbon+bio-activated carbon?>2?sand+Activated carbon?>1?sand+coconut charcoal?.?3?Thiourea-dioxide—reduced magnetic graphene oxide?TDMGO?was successfully prepared as an efficient adsorbent for the removal of tetracycline?TC?from aqueous solutions via strong adsorptive interactions.The composite was characterized by SEM,TEM,EDS,TGA,FT-IR,XPS,XRD and VSM.The effects of variables such as the pH,TC concentration,and temperature were successfully analyzed.The kinetics and isothermal parameters were described well by pseudo-second-order and Langmuir isotherm models,respectively,and the maximum adsorption capacity?qm?of TDMGO for TC calculated from the Langmuir isotherm was 1233 mg/g at 313 K.The removal of TC onto TDMGO,as indicated by the thermodynamic parameters,was spontaneous and endothermic.The removal performance was slightly affected by the solution pH.The presence of NaCl in the solution facilitated TC adsorption,and the optimum adsorption capacity was obtained when the NaCl concentration was>0.001 M.The adsorption capacity decreased slightly with increasing humic acid concentration.In addition,the adsorbent could be regenerated and reused.Based on these results,TDMGO is a promising adsorbent for the efficient removal of TC antibiotics from aquatic environments for pollution treatment. |
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