Details

Autor(en) / Beteiligte

• He, Jinxi
• Zhang, Baogang
• Tan, Cong
• Tang, Yang
• Shen, Zhongjun
• Wu, Songlin
• Zhou, Shungui

Titel

Distinguishing contributions of diverse sediment components to vanadium transport, immobilization and transformation in aquifer

Ist Teil von

• Water research (Oxford), 2024-11, Vol.265, p.122248, Article 122248

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2024

Quelle

MEDLINE

Beschreibungen/Notizen

• •Lower pH and higher vanadium concentration enhance V transport.•Minerals, especially carbonates and metal oxides, predominantly govern V transport.•Organic matter can abiotic reduce V(V), thereby impeding V transport.•Microorganisms, aided by minerals and organics, reduce V(V) to insoluble V(IV). Vanadium (V) occurs in environment naturally and anthropogenically, but little has been understood about its environmental behavior in groundwater aquifer with sediments. This study investigated the pentavalent V [V(V)] transport and transformation under the influence of different sediment components (minerals, organic matter, and microorganisms) through column experiments. All these components played pivotal roles in V immobilization. The synergistic effects of sediment components enhanced V retention compared to individual component. Mineral components, particularly those containing carbonates and metal oxides, predominantly influenced V(V) transport as indicated by XRD analysis. Organic matter, especially under low pH conditions, induced particle aggregation, thereby inhibiting the transport of V(V). The V K-edge X-ray absorption near-edge structure spectroscopy revealed the formation of tetravalent V[V(IV)] in treatments involving organic matter and microorganisms. Notably, organic matter exhibited the capability to directly reduce V(V). The introduction of microorganisms restricted V(V) transfer. V(V) reducing genera (e.g., Brevundimonas, Arenimonas, Xanthobacter) were detected, achieving V(V) reduction to insoluble V(IV). V(V) bioreduction was improved by minerals that promote microbial metabolism with enhanced electron transfer, or by organic matter that increases levels of intracellular nicotinamide adenine dinucleotide and extracellular polymeric substances. This study specifies the contributions of different sediment components to the transportation and transformation of V, deepening our understanding of V biogeochemistry in groundwater aquifer. [Display omitted]