干旱区生态环境知识资源中心(Arid): Evaluating the effects of formation and stabilization of opal/sand aggregates with organic matter amendments

Arid

DOI	10.1016/j.jenvman.2023.117749
	Evaluating the effects of formation and stabilization of opal/sand aggregates with organic matter amendments
	Li, Weilun; Wang, Yilin; Zhu, Feng; Li, Xiaobin; Zhou, Qiusheng; Liu, Guihua; Peng, Zhihong; Qi, Tiangui; Shen, Leiting
通讯作者	Wang, YL ; Zhu, F
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2023
卷号	337
英文摘要	Opal (SiO2 center dot nH2O, amorphous silica), the by-product of alumina extraction from coal fly ash (CFA), has a strong adsorption capacity and is also an important component of clay minerals in soils. The combining of opal with sand to form artificial soils is an effective disposal strategy for large-scale CFA stockpiles and reduction of environmental risk. Nevertheless, its poor physical condition limits plant growth. Organic matter (OM) amendments have broad potential applications for water-holding and improving soil aggregation. Effects of OMs (vermicompost (VC), bagasse (BA), biochar (BC) and humic acid (HA)) on the formation, stability and pore characteristics of opal/sand aggregates were evaluated through 60-day laboratory incubation experiments. Re-sults demonstrated that four OMs could reduce pH, with BC having the most significant effect, VC significantly increasing the electrical conductivity (EC) and TOC content of the aggregates. Except for HA, other OMs could improve the aggregates' water-holding capacity. The mean weight diameter (MWD) and percentage of >0.25 mm aggregates (R0.25) of BA-treated aggregates were the largest, and BA had the most noticeable contribution to macro-aggregate's formation. The best aggregate stability was obtained with HA treatment, meanwhile the percentage of aggregate destruction (PAD0.25) decreased with the addition of HA. After amendments, the pro-portion of organic functional groups increased, which favored aggregate's formation and stability; the surface pore characteristics were improved, with the porosity ranging from 70% to 75%, reaching the level of well -structured soil. Overall, the addition of VC and HA can effectively promote aggregates' formation and stabili-zation. This research may play a key role in converting CFA or opal into artificial soil. The combining of opal with sand to form artificial soil will not only solve the environmental problems caused by large-scale CFA stockpiles but will also enable the comprehensive utilization of siliceous materials in agriculture.
英文关键词	Opal sand aggregates Organic matter amendments Aggregate stability Pore characteristics
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000958371500001
WOS关键词	COAL FLY-ASH ; BAUXITE RESIDUE ; FERRIC-OXIDE ; SOIL ; DESERTIFICATION ; MINERALS ; SILICA
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397283
推荐引用方式 GB/T 7714	Li, Weilun,Wang, Yilin,Zhu, Feng,et al. Evaluating the effects of formation and stabilization of opal/sand aggregates with organic matter amendments[J],2023,337.
APA	Li, Weilun.,Wang, Yilin.,Zhu, Feng.,Li, Xiaobin.,Zhou, Qiusheng.,...&Shen, Leiting.(2023).Evaluating the effects of formation and stabilization of opal/sand aggregates with organic matter amendments.JOURNAL OF ENVIRONMENTAL MANAGEMENT,337.
MLA	Li, Weilun,et al."Evaluating the effects of formation and stabilization of opal/sand aggregates with organic matter amendments".JOURNAL OF ENVIRONMENTAL MANAGEMENT 337(2023).