Removal and biodegradation of contaminated compounds in soil by inclusion in cyclodextrins and a slurry bioreactor

为了获得环糊精修复污染土壤的基础知识，以联苯为模型污染化合物，得到了以下结果：1。联苯在HP-β-CD中的溶解度在各种cd中最高。HP-β-CD （CD）对联苯的缔合常数最大，说明CD具有去除污染土壤中联苯的潜在能力。联苯的吸附等温线用Langmuir方程表示。对经CD揉捏的土壤，联苯的释放和溶解明显快于未揉捏的土壤。这表明在揉制过程中，土壤中的联苯被有效地包含在CD中并从土壤中去除。为了去除CD中所含的联苯，将揉制的土壤冲洗几次。以CD溶液为洗涤液，洗涤3次后，土壤中联苯被完全去除。两种类型的联苯溶液在好氧条件下与活性污泥孵育：一种完全包含的联苯溶液与CD（包含溶液）和简单的混合溶液。对于简单混合的溶液，在100 ~ 200小时后观察到联苯的突然分解，而加入溶液中的联苯可以惊人地快降解，在45小时内完全消失，大约比简单混合的情况快5倍。为简化处理工艺，减少废水，采用活性污泥直接处理含CD揉制土壤中的联苯。联苯的降解速率几乎等于所含联苯的降解速率。这表明，在揉制过程中，联苯在揉制土壤中会被完美地包含，并且活性污泥直接处理揉制土壤对于污染土壤的生物修复是可行的。

To obtain the fundamental knowledge for the remediation of the contaminated soil by means of cyclodextrin, biphenyl was used as a model contaminated compound, and obtained the following results.1. The solubility of biphenyl in HP-β-CD has the highest value among various CDs. The association constant of biphenyl for HP-β-CD (CD) has the highest value, indicating that the CD has the potential ability of removing biphenyl from the contaminated soil.2. The adsorption isotherm of biphenyl was expressed by Langmuir equation.3. For the soil kneaded with CD, biphenyl released and dissolved markedly faster than without kneading. This implies that during kneading biphenyl in the soil was effectively included in CD and removed from the soil.4. To remove biphenyl included in CD, the kneaded soil was washed for a few times. After washing 3 times, biphenyl was totally removed from the soil when CD solution was used as the washing solution.5. Two types of biphenyl solution were incubated with an activated sludge under aerobic conditions : a perfectly included biphenyl solution with CD (included solution) and simply mixing solution. For the simply mixing solution, sudden decomposition of biphenyl was observed after 100 to 200 hours, while biphenyl in the included solution could be degraded surprisingly fast and was completely disappeared in 45 hours, about five times faster than in the simply mixing case.6. To simplify the treatment process and reduce the waste water, biphenyl in the kneaded soil with CD was directly treated by the activated sludge. The degradation rate of biphenyl was nearly equal to the included biphenyl. This implies that biphenyl in the kneaded soil would be perfectly included during kneading, and that the direct treatment of the kneaded soil by the activate sludge would be practical for the bioremediation of the contaminated soil.