【摘要】：中國垃圾填埋場滲瀝液中的污染物種類繁多,成分復雜,污染物擊穿填埋場防滲系統(tǒng),造成地下水以及土壤污染已成為填埋場環(huán)境安全問題中最為關注的問題之一。目前以什么標準判斷擊穿,以何種污染物作為指示污染物計算擊穿時間并評價防滲系統(tǒng)的防污性能尚不明確。針對這一問題,以中國6個典型填埋場內(nèi)代表性污染物的平均濃度為初始濃度,以中國相關環(huán)境標準中規(guī)定的各類污染物極限濃度作為污染濃度,建立污染物在復合防滲系統(tǒng)中的一維對流 彌散有限元模型。通過計算各類污染物在填埋場防滲系統(tǒng)中的擊穿規(guī)律和擊穿時間發(fā)現(xiàn),相比重金屬和持久性有機污染物,有機污染物(COD)最早擊穿防滲系統(tǒng),有機污染物(COD)可作為判定擊穿的指示污染物,擊穿HDPE土工膜單層和雙層復合墊層的時間分別為84.2 a和122.6 a;而擊穿時間主要受污染物的初始濃度、規(guī)定的污染濃度和污染物的遷移彌散參數(shù)共同影響。這一結果可為填埋場防滲系統(tǒng)擊穿時間的計算和防污性能的評價提供參考。
[Abstract]:There are many kinds of pollutants in leachate of landfills in China. The pollutants break through the landfill seepage control system and cause groundwater and soil pollution which has become one of the most concerned problems in landfill environmental safety. At present, it is not clear what standard is used to judge breakdown, which pollutant is used as indicator pollutant to calculate breakdown time and to evaluate anti-fouling performance of anti-seepage system. To solve this problem, the average concentration of representative pollutants in six typical landfills in China is taken as the initial concentration, and the limit concentration of various pollutants specified in the relevant environmental standards of China is taken as the pollution concentration. A one-dimensional convection dispersion finite element model of pollutants in composite seepage control system is established. By calculating the breakdown rule and breakdown time of various pollutants in landfill seepage control system, it is found that compared with heavy metals and persistent organic pollutants, organic pollutant (COD) is the first to break through the seepage control system. The organic pollutant (COD) can be used as an indicator pollutant to determine breakdown. The time of breakdown of HDPE geomembrane monolayer and double-layer composite cushion is 84.2a and 122.6 a, respectively. The breakdown time is mainly affected by the initial concentration of the pollutant, the prescribed concentration of the pollutant and the transport and dispersion parameters of the pollutant. The results can provide a reference for the calculation of breakdown time and the evaluation of antifouling performance of landfill seepage control system.
【作者單位】： 河海大學環(huán)境學院;河海大學水文水資源學院;江蘇省水利科學研究院;河海大學土木與交通學院;
【基金】：國家重點基礎研究發(fā)展計劃(“973”計劃)項目(2012CB719804) 國家科技重大專項(2013ZX07113001) 科技基礎設施建設計劃—國家工程技術研究中心培育點項目(BM2013013)
【分類號】：X799.3

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