人工复合土层去除再生水中典型内分泌干扰物的研究

发布时间：2018-01-15 02:29

  本文关键词：人工复合土层去除再生水中典型内分泌干扰物的研究　出处：《清华大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 再生水 内分泌干扰物 人工复合土层 吸附 降解

【摘要】：近几十年来,水资源越来越成为制约社会经济发展的战略性资源。再生水被看作是城市的第二水源,经深度处理后回用可以实现水资源的循环利用和补充,是缓解水资源紧缺问题的有效途径之一。再生水中残余污染物,尤其是微量有机污染物的存在,使其在再生利用过程中可能会对人体健康及生态安全存在风险。本论文针对再生水中典型EDCs污染物的去除,在研究典型EDCs污染物与填料介质的吸附降解作用的基础上,对人工复合土层处理系统的构建开展研究,考察其对典型EDCs的去除效果及作用机理,为实现再生水安全回用提供技术方法。对全国16座代表性城市的水样抽检调研结果表明,BPA在再生水和地下水中都是检出率和检出浓度最高的EDCs,EE2虽然检出浓度较低,但具有较强的雌激素活性,因而EE2的风险也不容忽视。双室一级动力学方程能较好地拟合土壤及其他填料介质对EE2和BPA的吸附过程。填料介质对EE2的吸附能力大小排序为:火山岩粘土陶粒≈页岩陶粒沸石;对BPA的吸附能力由大到小排序为:火山岩≈粘土陶粒页岩陶粒沸石。综合考虑填料的抗压能力、外形等物理性质和功能要求,优选对EE2和BPA吸附能力较强,且抗压强、利于布水的粘土陶粒作为人工复合土层系统中吸附层填料。EE2和BPA在土壤中的生物降解作用基本符合一级降解动力学。EE2和BPA在4℃时的生物降解速率都明显低于23℃时。在长期培养下,外加葡萄糖碳源能提高EE2/BPA的降解速率。低温对EE2/BPA降解速率的影响表明,在利用人工复合土层去除再生水中EDCs污染物的实际应用中,冬季低温条件会大大降低土层对EDCs的生物降解作用,复合土层构建中需要有完善的吸附层以保障去除效果。构建的两个人工复合土层系统在低浓度EDCs进水条件下对典型EDCs污染物具有很好的去除效果,以再生水(原水中EE2浓度未检出,BPA浓度为45.52ng L-1)为进水回灌6d和15d后,“火山岩+混合土壤+陶粒”人工土层对BPA的去除率分别为100%和99.56%,“土壤+陶粒”人工土层对BPA的去除率分别为100%和97.98%。当EE2和BPA的进水浓度升高到10μgL-1时,两类人工土层仍具有较好的去除效果。“火山岩+混合土壤+陶粒”人工土层对EE2的去除率在97.47%~99.89%之间,对BPA的去除率在95.70%~100%范围。相比而言,“土壤+陶粒”人工土层对EE2和BPA的去除能力明显低于“火山岩+混合土壤+陶粒”人工土层。
[Abstract]:In recent decades, water resources have become more and more a strategic resource restricting the development of social economy. Reclaimed water is regarded as the second source of water in cities. After advanced treatment, water resources can be recycled and replenished. It is one of the effective ways to alleviate the shortage of water resources. The existence of residual pollutants, especially trace organic pollutants, in recycled water. It may be a risk to human health and ecological safety in the process of recycling. This paper aims at the removal of typical EDCs pollutants in recycled water. Based on the study of the adsorption and degradation of typical EDCs pollutants and filler media, the construction of artificial composite soil treatment system was studied, and the removal efficiency and mechanism of typical EDCs were investigated. In order to provide a technical method for the safe reuse of reclaimed water, the results of water sample sampling in 16 representative cities in China show that BPAs are the highest detectable and detectable EDCs in both reclaimed water and groundwater. Although the concentration of EE2 was low, it had strong estrogenic activity. Therefore, the risk of EE2 can not be ignored. The two-chamber first-order kinetic equation can fit the adsorption process of EE2 and BPA in soil and other filler media. The order of adsorption ability of packing medium to EE2 is as follows: 1. :. Volcanic clay ceramsite 鈮，

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