矿化垃圾作为生物反应器填埋场日覆盖材料的性能研究

Study on Properties of Aged Refuse Used as Daily Covering Material in Bioreactor Landfill Site

[目的]确定矿化垃圾对渗滤液中污染物的去除效果。[方法]以德阳市堆肥场二次发酵后自然风干的堆肥垃圾为试验矿化垃圾,以成都市长安生活垃圾填埋场产生的渗滤液为试验渗滤液,通过矿化垃圾的基本性质测定和渗滤液中污染物去除试验,研究了不同粒度矿化垃圾做填埋场覆盖材料的性能。[结果]矿化垃圾的渗透系数K20主要为10-5cm/s级,只有d<10 mm粒度的矿化垃圾的K20为10-4cm/s级。矿化垃圾的pH值8.41,呈弱碱性。粒度为d<1 mm的矿化垃圾对COD和NH4+-N的去除效果优于其他3个粒度(d<3、5、10 mm),并且随着粒度的增大,矿化垃圾对污染物的去除率呈递减趋势;矿化垃圾对NH4+-N的去除效果不如对COD的去除效果好。[结论]矿化垃圾可以作为一种新型的、性能优良的替代覆盖材料。

[ Objective] The study aimed to confirm the removal effect of aged refuse on pollutants in leachate. [ Method ] With the compost garbage that was in natural air dry after second fermentation in Deyang compost site as tested aged refuse, and the leachate generated in life domestic waste landfills of Changan, Chengdu City as tested lcachate, the property of aged refuse with different particle size use as landfill covering material was studied by determination on the basic character of aged refuse and removal test on contaminant in leachate. [Result] The permeability coefficient K20 of aged refuse was mainly at 10^- 5 cm/s level,the K2o of aged refuse only with granularity of d 〈 10 nan was at 10^-4 cm/s level. The pH of aged refuse was 8.41 ,showed weak alkaline. The removal effect of aged refuse with granularity of d 〈 1 mm on COD and NH4^＋ -N was better than that of the other 3 granularities （d 〈 3,5,10 mm）, and along with the increase of grauularity,the removal rate of aged refuse on pollutants had the decline trend. The removal effect of aged refuse on NH4^＋ - N was not as good as on that of COD. [Conclusion] The aged refuse could be used as a new type and replaced landfill covering material with good performance.