海南省松涛水库流域典型生活垃圾总氮静态溶出规律研究

Research on the static leaching rules of total nitrogen of municipal solid wastes(MST) in Songtao Reservoir Basin

采用换水和不换水2种水力条件进行生活垃圾中总氮静态浸出实验,并运用相似理论建立实验模型;然后通过显著性检验构建总氮在水环境中的静态溶出理论模型;最后通过模型检验,筛选最优拟合函数,进而推算出总氮溶出速率.结果表明:松涛水库流域典型生活垃圾中总氮含量为0.77%;在换水和不换水实验中,总氮溶出规律可分别用Logarithmic模型、Cubic模型近似描述,检验推导出的溶出速率方程分别为:q=208.16-58.49ln(t)和q=-25.13+0.842t-0.003t2;液固比对总氮溶出速率有显著影响,液固比越大,溶出速率越大;总氮溶出模型可以准确预测生活垃圾中总氮在水体中的短期溶出速率.

With the increasing dumping of municipal solid wastes(MST) in Songtao Reservoir Basin by years, it has already become one of the main pollutants influencing the water quality. In order to find out the quantitative influence of the MST on the water environment, the static leaching rules of total nitrogen under different hydraulic conditions were studied as following method. Firstly, the static leaching experiments of total nitrogen were made under water-changing condition and no-water-changing condition, and the experiment models were constructed by similarity theory. Secondly, the static leaching theoretical models of total nitrogen in different water conditions were constructed by significance testing. And finally, leaching rate of total nitrogen was calculated by optimal smoothing distribution, respectively. The results of static leaching experiment indicated that the content of nitrogen in Songtao Reservoir MST was 0.77%. The optimal smoothing distribution was q=208.16-58.49ln(t), q=-25.13+0.842t-0.003t2 from Logarithmic model and Cubic model under water-changing condition and no-water-changing condition, respectively. With the increasing of liquid-solid- ratio, the nitrogen leaching rate increased. The optimal smoothing distributions in this study could predict accurately the total nitrogen short-term leaching rate under different hydraulic conditions.