废旧胶粒PRB活性材料对污染地下水吸附适应性研究

针对多组分污染地下水危害严重、治理费用高的特点,采用废旧轮胎橡胶经破碎后制备的胶粒作为PRB系统活性材料,对污染地下水中COD、NH_4^+—N、Fe^(2+)、Mn^(2+)、SO_4^(2-)吸附效果进行条件适应性研究。结果表明:在胶粒投加量为0.5 g/200m L,振荡频率150r/min,反应时间36h,p H值为7的条件下,污染地下水中COD、NH_4^+—N、Fe^(2+)、Mn^(2+)、SO_4^(2-)去除率分别为44.3%、24.8%、96.2%、86.2%、9.5%,表明胶粒对COD、Fe^(2+)、Mn^(2+)污染物具有较好的去除效果。胶粒对COD(乳酸钠)吸附特性可较好地符合Temkin吸附等温模型和Elovich动力学模型。该方法对于拓宽废旧橡胶资源化利用及修复含有机物、铁锰污染的地下水方面具有一定的积极意义。

Waste Tire Rubber Particles using to Improve the Properties of Local Asphalt Concrete

The research considered urgent ecological reasons linked to environment such as worn tires, the waste tire rubber＇s powder was collected from the tire cars repair shops （passed from the sieve No 18 μm）, and used to improve the asphalt concrete properties. Raw materials used were prepared and tested. Varies of asphalt concrete mixtures were prepared with different ratios of bitumen （5, 5.5, 6, 6.5, 7% % of concrete weight）. The Marshall mix design method was used to determine optimum conditions for bitumen in asphalt concrete with specific weight, stability and flow Test, the optimum amount of bitumen was 6.1% of whole asphalt concrete. The different percentages of waste tire rubber powder （0.0, 0.05, 0.10, 0.15% of bitumen weight） were added in optimum bitumen of asphalt concretes, then specific weight and Marshall test were evaluated. These asphalt-rubber mixtures were found to act quite differently from traditional, unmodified asphalt mixtures. However, these results indicate that improved pavement performance can be achieved with asphalt-rubber binder.