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

通过包含在环糊精和浆料生物反应器中去除和生物降解土壤中的污染化合物

基本信息

批准号：
12650754
负责人：
FURUTA Takeshi
金额：
$ 2.18万
依托单位：
Tottori University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650754/
关键词：
cyclodextrin contaminated soil dioxin twin screw keader

项目摘要

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.

为了获得环糊精修复污染土壤的基础知识，以联苯作为模型污染化合物，得到以下结果： 1． CDs与HP-β-CD(CD)的缔合常数最高，表明CD具有去除污染土壤中联苯的潜在能力。2．联苯含量用Langmuir方程表示。3．用CD揉捏的土壤中，联苯的释放和溶解速度明显快于未揉捏的土壤，这表明土壤中的联苯在揉捏过程中被有效地包含在CD中并从土壤中去除。 CD中含有联苯，用CD溶液作为洗涤液时，将捏合的土壤洗涤3次后，联苯完全从土壤中除去。 5．的联苯溶液与活性污泥在有氧条件下孵育：与CD完美混合的联苯溶液（包含溶液）和简单混合溶液对于简单混合溶液，在100至200小时后观察到联苯突然分解，而联苯在其中。所包含的溶液可以惊人地快速降解，并在 45 小时内完全消失，比简单混合的情况快约五倍。 6．废水中，含CD的捏合土中的联苯直接被活性污泥处理，联苯的降解率几乎等于捏合过程中所包含的联苯，这表明捏合过程中联苯被完全包含在内。用活性污泥处理捏合土壤对于污染土壤的生物修复是可行的。