Study On Removal And Regulation Techniques Of Sulfamethoxazolum And Norfloxacin In Water Treatment System

As the healthy, especially the water quality, is becoming a primal public concern, some micropolutants have been the subject focused on by researchers. Among those micropolutants, Sulfamethoxazole and Norfloxacin are widely existed and largely used pharmaceuticals as the most important antibiotics. Information about physicochemical characteristics has been observed. Nevertheless, the microscopic researches on the kinetics, mechanisms and detailed reaction pathways of these processes are relatively few. So it is a matter of great significance to find the degradation technologies, some testing techniques and mechanisms in those contaminations.The analytical methods are based on SPE-HPLC, due to the low antibiotics concentrations in wastewaters (ppb or ppt). Then the removal method and the possible removal mechanisms are investigated in water treatment system. In the study of target compound's change regularity and removal technology such as pre-oxidation, coagulation, filtration, sand filtration, and ozone-actived carbon adsorption are utilized in simplified manpower model for both SMZ and NOR in confected water and the target compound in source water which analyze its fate in water treatment system, and synergistic removal with other micropolutants as well as the main control conditions.The experiment results showed that: the common technologies used in water treatment plants may not be efficient enough to accomplish their complete removal. The optimal removal conditions were described after operation on the simulation system. For the pre-oxidation, the orthogonal test was carried out to be optimize degrade conditions, considering the affection of oxidation time and oxidant dosage. The conditions have less affection on the removal of SMZ or NOR. The optimal conditions were that: oxidation time was 60 min, KMnO₄ dosage was 0.5mg/L. In coagulation part, polyaluminium chloride and polyacrylamide have been used as coagulant and flocculant. The flocculant dosage has been a great impact on the removal result. Excess dosage may lead to water quality deterioration. The removal in sand filtration is lowest, in the condition of column height 550mm, water inflow 10.27L/h, SMZ removal was 9%, and NOR removal was 5.5%. In source water, the removal of SMZ and NOR were 35.5% and 24.5% under common technologies treatment. Ozone intake flow rate was 640L/h, water inflow was 8.64L/h will lead the removal up to 20% of target compound which were used by advanced treatment to reduce the amount of these antibiotics. GAC filter column, used for the adsorption experiments, was 325mm in its inside-diameter. Actived carbon system with continuous influent of 60 days showed that the contents of SMZ and NOR in effluent was under the detection limit. In source water experiment, actived carbon system with continuous influent of 60 days showed that SMZ and NOR removal in effluent were over 85%. Finally the overall removal of SMZ and NOR were 91.71% and 89.8%, which indicated a satisfying removal effect.By GC-MS detecting method, the degradation product of SMZ in water treatment system was sulfanilamide under the optimal degradation conditions. In the product of NOR degradation, NO₃^- and carbonyl have been detected, so it could be inferred that the ring-opening reaction and oxidation of benzene were occurred during the degradation process, simultaneously the new absorption peaks were appeared.