臭氧氧化-SBR联合工艺处理四环素生产废水的研究

发布时间：2018-06-20 03:28

本文选题：四环素生产废水 + 臭氧氧化　；参考：《南京农业大学》2015年硕士论文

【摘要】：近年来随着我国经济的持续高速发展,环境污染问题日渐成为了国民聚焦的热点问题。在我国的诸多环境污染问题当中,最为凸显的是水污染问题。四环素生产废水有着成分复杂、CODCr浓度较高、难以生物降解、污染性强等特点。因此,研究四环素生产废水的处理技术有着十分重要的现实意义。在本文中,结合四环素生产废水的物化性质,先运用臭氧氧化的方式对废水进行预处理,后续再运用SBR对其进行深度处理。在臭氧氧化预处理四环素生产废水的研究中,主要从废水初始pH、臭氧投加量、臭氧氧化时间和反应温度这四个因素研究其对臭氧氧化预处理效果的影响,确定了臭氧氧化法预处理四环素生产废水的最佳工艺条件:常温状态下,废水初始pH为9,臭氧投加量为400mg/min,臭氧氧化时间为2 h。在此最佳条件下,四环素生产废水的臭氧氧化预处理效果明显,CODCr浓度从6360mg/L降低到4935 mg/L,去除率达到22%以上,B/C从0.16提高到了 0.50,废水的可生化性得到了较大的提高。在反应最佳工艺条件下,臭氧氧化去除废水中四环素的效果显著,四环素浓度从672mg/L降到50mg/L以下。利用HPLC-MS检测四环素在臭氧氧化过程中的产物,在一级质谱图中主要发现了 3种物质,它们的质子化分子离子特征峰分别为m/z=461[M+H]+,432[M+H]+和480[M+H]+,将其分别命名为A-C。通过分析得出四环素在臭氧氧化过程中的中间产物和降解途径,这对四环素生产废水实际工程化处理具有十分重要的参考意义。经臭氧氧化预处理后的四环素生产废水进入SBR生化系统进行深度处理,该试验研究了水力停留时间、溶解氧浓度和磷投加量对SBR生化处理效果的影响。通过单因子变量的方法,得出SBR生化系统的最佳工艺条件为:水力停留时间为5d,溶解氧浓度为2mg/L,磷投加量为CODCr:P=500:1。在此最佳工艺条件下,当CODCr进水浓度为4935mg/L,SBR反应器连续运行30d,6d后CODCr出水浓度不再明显下降,最终出水CODCr基本稳定在330 mg/L,可以达到现行的《污水排入城市下水道水质标准》(CJ343-2010)排放要求。
[Abstract]:In recent years, with the sustained and rapid economic development in China, environmental pollution has become the focus of national attention. Among many environmental pollution problems in China, water pollution is the most prominent problem. The wastewater from tetracycline production is characterized by high concentration of complex CODCr, difficult biodegradation and strong pollution. Therefore, the study of tetracycline production wastewater treatment technology has a very important practical significance. In this paper, combined with the physical and chemical properties of tetracycline production wastewater, the wastewater was pretreated by ozone oxidation, and then advanced treatment was carried out by SBR. In the study of pretreatment of tetracycline wastewater by ozone oxidation, the effects of ozone oxidation on the pretreatment of tetracycline wastewater were studied from four factors: initial pH, ozone dosage, ozone oxidation time and reaction temperature. The optimal conditions for pretreatment of tetracycline production wastewater by ozone oxidation were determined as follows: at room temperature, the initial pH of the wastewater was 9, the ozone dosage was 400 mg / min, and the ozone oxidation time was 2 h. Under the optimum conditions, the concentration of CODCr in tetracycline production wastewater was significantly reduced from 6360 mg / L to 4935 mg / L, and the removal rate was more than 22%, from 0.16 to 0.50, and the biodegradability of the wastewater was greatly improved. Under the optimum reaction conditions, the removal of tetracycline from wastewater by ozone oxidation was remarkable, and the concentration of tetracycline decreased from 672 mg / L to less than 50 mg / L. The products of tetracycline in the process of ozone oxidation were detected by HPLC-MS. Three main substances were found in the first order mass spectrogram. Their protonated molecular ion characteristic peaks were m/z=461 [M H] 2 [M H] and 480 [M H], and they were named A-C, respectively. The intermediate product and degradation pathway of tetracycline in the process of ozone oxidation are obtained, which is very important for the practical engineering treatment of tetracycline production wastewater. The tetracycline wastewater pretreated by ozone oxidation was used in SBR biochemical system for advanced treatment. The effects of HRT, dissolved oxygen concentration and phosphorus dosage on the biochemical treatment effect of SBR were studied. Through the method of single factor variable, the optimum technological conditions of SBR biochemical system are obtained as follows: hydraulic retention time is 5 days, dissolved oxygen concentration is 2 mg / L, phosphorus dosage is CODCr: P = 500: 1. Under the optimum conditions, when the influent concentration of CODCr was 4935mg / L SBR reactor for 30 days or 6 days, the effluent concentration of COD Cr did not decrease obviously. The final effluent CODCr is stable at 330 mg / L, which can meet the current discharge requirements of CJ343-2010.
【学位授予单位】：南京农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X787

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