微生物矿化技术的风积沙胶结性能实验研究

Experimental Study on Cementation Performance of Aeolian Sand by Microbial Mineralization Technology

微生物诱导碳酸钙沉淀(Microbial Induced Calcite Precipitation,MICP)技术可显著提高风积沙胶结体密实度,降低其渗透性,是一种环境友好型的生物工程技术。基于巴氏芽孢杆菌适宜的培养环境和离子浓度条件,于无菌环境下开展细菌活化培养及生长曲线测定工作,并进行了新疆沙漠风积沙的微生物矿化胶结实验。实验结果表明,在pH 7.06,环境温度23.70℃,环境湿度44.00%条件下,有菌组胶结体内晶体覆盖率较无菌组提高47.31%,有菌组胶结体密实度显著提高,有菌组试块吸水率较无菌组降低24.30%,经细菌矿化胶结处理后的风积沙在保水方面更具优势。MICP技术为沙漠防治提供了一种新的思路。

Microbial induced calcium carbonate precipitation technology can significantly improve the compactness of aeolian sand cementation and reduce its permeability,which is an environment-friendly bioengineering technology.Based on the suitable culture environment and ion concentration conditions of Bacillus pasteurianus,the activation culture and growth curve measurement of Bacillus pasteurianus were carried out in aseptic environment,and the microbial mineralization and cementation experiment of Aeolian sand in Xinjiang desert was carried out.The results showed that under the conditions of pH 7.06,ambient temperature 23.70℃and ambient humidity 44.00%,the coverage rate of crystals in the cementation body of the bacteria-bearing group was increased by 47.31%,the compactness of the cementation body of the bacteria-bearing group was significantly improved,and the water absorption rate of the test block of the bacteria-bearing group was reduced by 24.30%compared with that of the aseptic group.The Aeolian sand treated by bacteria mineralization and cementation had more advantages in water retention.MICP technology provides a new idea for desert control.