Establishing Vadose Zone Slow-Release Carbon Sources for Enhanced Bioremediation Using Silica Suspension

doi:10.2136/vzj2017.09.0175

	Establishing Vadose Zone Slow-Release Carbon Sources for Enhanced Bioremediation Using Silica Suspension
	Zhong, LR; Lee, B; Yang, S; Zhong, Lirong; Lee, Brady; Yang, Shuo
刊名	VADOSE ZONE JOURNAL
	2018
卷号	17 期号:1
关键词	COLLOIDAL SILICA PERMANGANATE GEL RHEOLOGICAL PROPERTIES STABILITY CATIONS
ISSN号	1539-1663
DOI	10.2136/vzj2017.09.0175
文献子类	Article
英文摘要	Delivery of C sources (nutrients) to the vadose zone and establishing a slow-release C source in this unsaturated zone are essential for promoting long-term, enhanced contaminant bioremediation at sites with deep vadose zones, such as the Hanford Site in the southeast of the state of Washington. Conventional solution-based injection and infiltration approaches face challenges in achieving delivery goals. Aqueous colloidal silica suspension has characteristics that can potentially be used for nutrient delivery and slow-release source setup. This research was conducted to (i) demonstrate delayed gelation of colloidal silica suspensions with the presence of nutrients; (ii) prove that gelation takes place in sediment and the gel slowly releases nutrients; and (iii) show that silica suspensions are injectable for vadose zone emplacement Results demonstrated that nutrient-laden colloidal silica suspensions have low initial viscosity and then increase in viscosity with time until reaching gelation, allowing for a slow release of nutrients into the environment Higher salt and silica concentrations increased the rate of viscosity climbing and the rate of gelation, whereas higher silica concentrations resulted in stronger gels. Nutrients were slowly released from gels in both batch and column experimental settings. The rheological and injection behavior of the silica suspensions revealed the injectability of these fluids. This study demonstrated that colloidal silica suspension could be used as a carrier to distribute nutrients to the vadose zone and to establish slow-release nutrient sources.
WOS记录号	WOS:000439705800003
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/26804]
专题	中国科学院过程工程研究所
推荐引用方式 GB/T 7714	Zhong, LR,Lee, B,Yang, S,et al. Establishing Vadose Zone Slow-Release Carbon Sources for Enhanced Bioremediation Using Silica Suspension[J]. VADOSE ZONE JOURNAL,2018,17(1).
APA	Zhong, LR,Lee, B,Yang, S,Zhong, Lirong,Lee, Brady,&Yang, Shuo.(2018).Establishing Vadose Zone Slow-Release Carbon Sources for Enhanced Bioremediation Using Silica Suspension.VADOSE ZONE JOURNAL,17(1).
MLA	Zhong, LR,et al."Establishing Vadose Zone Slow-Release Carbon Sources for Enhanced Bioremediation Using Silica Suspension".VADOSE ZONE JOURNAL 17.1(2018).