| The pharmaceutical industry is one of the important industries of the industrial system in China, emissions from its production wastewater with high content of pollutants, low biological, high toxicity, strong fluctuation of water quality and quantity, belong to one of the difficult to deal with industrial waste water.Mainly discussed the the influence of main parameters on micro electrolysis and the ozone oxidation treatment, and analyzed running effect field pilot. Through UV-vis and 3D-EEM spectrum combined with the parallel factor analysis (PARAFAC) and the related parameters of DOM derived from pharmaceutical wastewater to study its degradation mechanism, research mainly reflects in the following respects:Hydraulic retention time (HRT), intial pH and gas water ratio is studied through experiments for pharmaceutical wastewater treatment effect of micro electrolysis technology. The results show that the optimal condition for micro electrolysis treating pharmaceutical wastewater is as follows:HRT= 80 min, pH= 3, gas water ratio= 100:1. Under the best condition, the removal rate of COD, ammonia nitrogen and chromaticity is 43.9%,7.9% and 82.6%, respectively. By adjusting pH of micro-electrolysis to 9, which is the optimal condting for pollutants removal, the removal rate of COD, ammonia nitrogen and chromaticity reached optimal 59.5%,44.6% and 53.5%, respectively.Hydraulic retention time (HRT), intial pH and ozone dosage is studied through experiments for pharmaceutical wastewater treatment effect of active carbon+ozone oxidation technology. The results show that the optimal condition for active carbon+ ozone oxidation treating pharmaceutical wastewater is as follows:HRT=60 min, pH=9 and ozone dosage=0.1m3/h. Through contrast experiments it is concluded that active carbon adsorption+ ozonation has the strongest efficiency for COD removal.Pharmaceutical wastewater treatment effect was investigated through the pilot test using combined micro-electrolysis-AO-ozonation-BAF process. In stable running stage with 80% wastewater, COD removal rate of micro-electrolysis-AO-BAF combination process is about 60%, effluent COD is about 200 mg/L; Total removal rate and amount of ammonia nitrogen at around 40% and around 250 mg/L, respectively. During the 50% wastewater period, COD removal rate is about 70%; Effluent COD at around 200 mg/L. Later ozonation was applied after AO process to enhance treatment effect. Total COD removal rate is about 80%, effluent COD is less than 120 mg/L; When the influent average concentration of ammonia nitrogen was 308.8 mg/L, the avarage removal rate and amount of ammonia nitrogen reached 94.1% and 18.2 mg/L, respectively, which reached the requirements of relevant standards. After treated with ozonation, COD removal efficiency of BAF increased to 40%, greatly improving the biodegradability.3D-EEM combined PARAFAC analysis was carried out to to analyze samples of micro electrolysis experimental wastewater. Total three parallel factor components was derived:a type of protein components C1 and two types of humic acid components C2 and C3. Through the micro electrolysis treatment, all three components were removed effectively. Through traditional peak picking method, mainly contain two kinds of fulvic acid components and two types of protein components were found. After treating by the activated carbon+ozonation, class fulvic acid fluorescence peak disappeared, at the same time; most fluorescence peak of proteins was also removed. Through UV-vis spectra analysis, benzene ring in the pharmaceutical wastewater was removed obviously after treating by Micro electrolysis and ozonation. C=C and C=O double break open in the reaction process, macromolecular material degradated into micromolecule. |
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