Removal And Mechanism Of Sulfamethoxazole And Erythrocin During Simulation SAT

Wastewater reuse is an effective mean to solve the shortage of water resource, and the security of recycling water draw a lot of attention. Antibiotics, as drugs, were widely used in the world, but they can not be completely metabolismed in human and animals. Most of them were discharged to urban sewerage system. The removal efficiency of the existing technology for antibiotics treating in WWTP is limited, and ng/L or μg/L antibiotics was detected in the effluent water of the WWTP. In spite of the low content, long-term exposured to the environment easily lead to bacterial resistance, affect the ecological balance, and endanger human health. It brings an ignored problems to the wastewater recycling. Soil aquifer treatment(SAT) as a kind of low cost, high efficiency wastewater advanced treatment technology, was widely applied in wastewater recycling engineering. In this experiment, using SAT systems purify the effluent water of the WWTP, analysed the contribution of aerobic function and other function to antibiotics removing, and verified removal mechanisms, revealed the existence of soluble organic matter(DOM) removal effects of antibiotics, and improved the SAT technology to strengthen the purpose of the removal of antibiotics.Through establishing the selective system of priority control antibiotics in the water environment, analyzed the persistence of existence, the content and the toxicity of typical antibiotics, choosed the antibiotics which were the largest potential risk to the environment as the research object, and finally determined for sulfamethoxazole(SMZ) and erythromycin(EM). SAT used sand loam as filled soil. The removal of two kinds of antibiotic effect, SMZ with synthetic wastewater removal rate was 87.54%, and the EM was up to 92.94%. Two groups of soil column with 2mmol/L Na N3 were to restrain activity of aerobic microorganisms, and contrast analysis found that aerobic biological role for the removal of two kinds of antibiotics had a bigger contribution, and contribute more in the EM removal. Investigating the removal of soil column height on different antibiotics, the removal of SMZ, the largest contribution to the soil column 25 to 50 cm, accounted for 55.05%, and 0 ~ 25 cm, 50 ~ 75 cm is the main EM removal section, remove contributed respectively 45.86%, 24.27%. Method using high performance liquid mass spectrometry analysis after dealing with the SAT system of antibiotics intermediate water, found four degradation products of SMZ by navier-stokes broken keys and change the evil ring, and EM had six respectively by large ring lactone ring change and remove oxygen and carat sugar sugar amine to produce the product.In order to analysis how DOM affected the antibiotics removal, the actual secondary effulent wastewater was used, and the removal rate of SAZ with actual wastewater SMZ fell to 72.04%, the removal rate of EM dropped to 64.74%. DOM was scaled by the XAD resin,and found that the humic acids in transition hydrophilic organic acids(TPI-A) and hydrophobic organic acids(HPO-A) competing for adsorption sites with SMZ and EM, led to the decrease of the removal rate of two kinds of antibiotics. The removal rate of EM decline was larger and the bacteria which can decomposing EM counld use hydrophilic components(HPI),additional carbon sources limtied, and co-metabolism was inhibited.By comparing the adsorption characteristics of fly ash and soil to the antibiotics, found the adsorption quantity of the two antibotics in fly ash is greater than the soil. But the addition of fly ash had inhibition to the soil catalase activity, finally determined the ratio of soil to fly ash(volume ratio) was 5:1, and the soil column top 25 cm in the form of overlying soil improvement SAT system, improved the SAT system has strengthening effect to remove the antibiotics in the actual human sewage, found that the removal rate of SMZ increased to 79.16%, the EM removal efficiency to 68.11%, improved SAT system on the strengthening of the SMZ removal effect is better.This research results for realizing the high efficient and safe injection of secondary water underground is of great theoretical significance and practical value.