Study On Antibiotic Wastewater Treatment By Coupling UV-K₂S₂O₈ Process

Antibiotic wastewater have complex composition, high suspended solids, high organic content, dark color, high salinity, high toxicity and other features. This series of characteristics of antibiotic wastewater lead to serious pollution to the environment. In recent years, antibiotics continue to be detected in the environment,which seriously pollute the water environment of our country. In 2013 China total antibiotic use is about 162,000 tons, Per capita usage is five times more than in Europe and America and other countries, most of which is used is sulfonamides,tetracyclines, quinolones, macrolides, β-lactam,etc.,In this paper, sulfonamides,tetracyclines and typical β-lactams are taken as the research object, to seek an efficient, simple, complete degradation, no secondary pollution of the new antibiotic treatment. Photocatalytic Oxidation as a typical representative of green water treatment technology, because of its mild reaction conditions, no secondary pollution,non-selective, most economic advantages, so Photocatalytic Oxidation in treatment of antibiotic wastewater have broad application prospects. UV-K₂S₂O₈ coupling technique is based SO4-· new advanced oxidation, UV can catalyze K2S2O8 the rapid creation SO4-·, having a fast reaction rate, high efficiency, no secondary pollution and other advantages.This paper selects sulfadiazine and tetracycline simulated wastewater as the research object, using UV-K₂S₂O₈ technology to process it, first, we compared alone K2S2O8, alone UV radiation and UV-K₂S₂O₈ joint use of antibiotics degradation,Second, investigating the influence of different factors on the reaction of antibiotics degradation, analysising degradation kinetics, suggesting that degradation pathways,exploring the degradation mechanism. Experimental results show that, UVand K2S2O8 joint use can significantly improve the effectiveness of antibiotic removal and mineralization, the optimal reaction conditions sulfadiazine:pH=7, K2S2O8 dosage of 0.5 mmol/L, the reaction10 min, under this condition, when sulfadiazine initial concentration of 5.0 mg/L, the sulfadiazine can be completely removed,salinity up to 89.11%, tetracycline optimal reaction conditions: pH=4, K2S2O8 dosage of 0.3 mmol/L, the reaction 10 min, in this condition next, when the initial concentration of tetracycline 15.0 mg/L, the degradation rate of 100%, but the salinity is not high, only 40.11%; both of degradation comply with order kinetics,this experiment also analyzed the degradation mechanism of two antibiotics by high efficiency liquid chromatography- mass spectra（LC-MS）.Finally, in order to investigate the effect of UV-K₂S₂O₈ joint use technology treat actual antibiotic wastewater, with imipenem wastewater secondary effluent for the study, carried out UV-K₂S₂O₈ technology advanced treatment of imipenem production wastewater, contrast separate K2S2O8, alone UV radiation and in combination with UV and K2S2O8 actual wastewater treatment effect and explore the optimal reaction conditions.The experimental results show that, UV-K₂S₂O₈ technology can significantly improve the treatment effect of actual wastewater, this showed significant coupling effect, in K2S2O8 dosage is 2.0 g/L, when the reaction time was 90 min, the COD removal efficiency and the TOC removal efficiency could reach 90.1% and 94.4%, respectively. This research could effectively remove the organic matter in wastewater nonbiodegradable.UV-K₂S₂O₈ technology can quickly degradate antibiotics of wastewater, and successfully applied to the advanced treatment of antibiotic wastewater. This technology is an effective refractory organic wastewater treatment technology, no secondary pollution, easy to operate, it provide technical reference for advanced treatment of antibiotic wastewater, have a certain significance for other refractory organic wastewater deep treatment and a certain application value.