准好氧填埋场垃圾渗滤液的室内模拟研究
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摘要
本文基于当前我国厌氧填埋场的不足,尤其是渗滤液难于处理的现状,采用室内模拟试验和数学模型对准好氧填埋场的渗滤液水质、影响因素和衰减变化规律进行研究。在室内模拟的条件下显示,准好氧填埋场垃圾渗滤液的COD自然衰减至国家一级排放标准(100mg/L)仅需2~3年,而氨氮只需1年左右即可达到相应的国家一级排放标准(15 mg/L)。相比之下,厌氧填埋场渗滤液中的类似污染物在自然条件下需要十几年甚至几十年的时间方能达到相同标准。由此表明,准好氧填埋场自身的净化处理功能是十分强大的。这为城市生活垃圾填埋场的渗滤液处理和污染控制提供了重要的思路和有效的途径。
     就填埋垃圾的不同压实密度和不同的渗滤液收集管管径,对准好氧填埋场的渗滤液水质进行了模拟试验,结果表明,(1)填埋垃圾的压实密度是准好氧填埋场渗滤液水质降解的重要影响因素之一。准好氧填理场的渗滤液水质降解效果将随着压实密度的增大而减弱。但是,对不同压实密度的准好氧填埋场的渗滤液氨氮衰减预测显示,当压实密度小于535 kg/m~3时,其对准好氧填埋场的渗滤液氨氮降解效果影响不甚明显;(2)渗滤液收集管管径也是影响准好氧填埋场降解效果的重要因素之一。准好氧填埋场的渗滤液水质降解效果将随着渗滤液收集管管径的增大而增强。但是,对不同渗滤液收集管管径的准好氧填埋场的渗滤液COD衰减预测显示,当渗滤液收集管管径大于50mm时,渗滤液收集管管径对准好氧填埋场的渗滤液COD降解效果影响不大。上述研究结果对准好氧填埋场的深入研究和工程应用具有重要的参考价值。
In view of the existing defects in anaerobic landfills, especially the difficulty of their leachate treatment, laboratory simulation and mathematics modal of semi-aerobic landfills are introduced to investigate the leachate quality, factors influencing it and its degradation rules. The simulative results show that the leachate's COD of semi-aerobic landfills decrease to National Discharge Standard Class I (100mg/L) in 2-3 years, and ammoniac nitrogen reduce to the standard (15 mg/L) in one year or so. In contrast, the leachate's COD and ammoniac nitrogen of anaerobic landfill need more than one decade and even several decades to decrease to the same standard. Therefore, the author reaches the conclusion that the self-purity ability of semi-aerobic landfills is very powerful. This finding provides an important idea and effective method for the treatment and control of leachate from landfills.
    Laboratory simulation is carried out to find out how different densities of refuse and diameters of leachate collection pipes influence the leachate quality of semi-aerobic landfills. The results show that (1) the density of refuse is one of the important factors to influence the leachate quality degradation. The less the refuse density is, the better the leachate quality degradation is. Whereas, the predicted results of ammoniac nitrogen degradations in case of different refuse densities display that once the refuse density is less than 535 kg/m3, the refuse density has little effect on the leachate ammoniac nitrogen degradation. (2) the diameters of leacheate collection pipes is also one of important factors to influence the leachate quality degradation. The longer the diameter of leachate collection pipe is, the better the leachate quality degradation is. However, the predicted results of COD degradations in case of different diameters of leachate collection pipes reveal that once the diameter of leachate collection pipes is more than 50mm, the influence of the leachate collection pipes' diameter on the leachate COD degradation is not obvious at all. The above research findings offer valuable references to the further study and engineering application of semi-aerobic landfills.
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