發(fā)布時間：2018-01-15 02:29

  本文關鍵詞：人工復合土層去除再生水中典型內(nèi)分泌干擾物的研究　出處：《清華大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 再生水 內(nèi)分泌干擾物 人工復合土層 吸附 降解

【摘要】：近幾十年來,水資源越來越成為制約社會經(jīng)濟發(fā)展的戰(zhàn)略性資源。再生水被看作是城市的第二水源,經(jīng)深度處理后回用可以實現(xiàn)水資源的循環(huán)利用和補充,是緩解水資源緊缺問題的有效途徑之一。再生水中殘余污染物,尤其是微量有機污染物的存在,使其在再生利用過程中可能會對人體健康及生態(tài)安全存在風險。本論文針對再生水中典型EDCs污染物的去除,在研究典型EDCs污染物與填料介質(zhì)的吸附降解作用的基礎上,對人工復合土層處理系統(tǒng)的構建開展研究,考察其對典型EDCs的去除效果及作用機理,為實現(xiàn)再生水安全回用提供技術方法。對全國16座代表性城市的水樣抽檢調(diào)研結果表明,BPA在再生水和地下水中都是檢出率和檢出濃度最高的EDCs,EE2雖然檢出濃度較低,但具有較強的雌激素活性,因而EE2的風險也不容忽視。雙室一級動力學方程能較好地擬合土壤及其他填料介質(zhì)對EE2和BPA的吸附過程。填料介質(zhì)對EE2的吸附能力大小排序為:火山巖粘土陶�！猪搸r陶粒沸石;對BPA的吸附能力由大到小排序為:火山巖≈粘土陶粒頁巖陶粒沸石。綜合考慮填料的抗壓能力、外形等物理性質(zhì)和功能要求,優(yōu)選對EE2和BPA吸附能力較強,且抗壓強、利于布水的粘土陶粒作為人工復合土層系統(tǒng)中吸附層填料。EE2和BPA在土壤中的生物降解作用基本符合一級降解動力學。EE2和BPA在4℃時的生物降解速率都明顯低于23℃時。在長期培養(yǎng)下,外加葡萄糖碳源能提高EE2/BPA的降解速率。低溫對EE2/BPA降解速率的影響表明,在利用人工復合土層去除再生水中EDCs污染物的實際應用中,冬季低溫條件會大大降低土層對EDCs的生物降解作用,復合土層構建中需要有完善的吸附層以保障去除效果。構建的兩個人工復合土層系統(tǒng)在低濃度EDCs進水條件下對典型EDCs污染物具有很好的去除效果,以再生水(原水中EE2濃度未檢出,BPA濃度為45.52ng L-1)為進水回灌6d和15d后,“火山巖+混合土壤+陶�！比斯ね翆訉PA的去除率分別為100%和99.56%,“土壤+陶�！比斯ね翆訉PA的去除率分別為100%和97.98%。當EE2和BPA的進水濃度升高到10μgL-1時,兩類人工土層仍具有較好的去除效果。“火山巖+混合土壤+陶�！比斯ね翆訉E2的去除率在97.47%~99.89%之間,對BPA的去除率在95.70%~100%范圍。相比而言,“土壤+陶�！比斯ね翆訉E2和BPA的去除能力明顯低于“火山巖+混合土壤+陶�！比斯ね翆�。
[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，

本文編號：1426410