Interactions of high-rate nitrate reduction and heavy metal mitigation in iron-carbon-based constructed wetlands for purifying contaminated groundwater

Jia, Lixia; Liu, Hai; Kong, Qiang; Li, Ming; Wu, Shubiao; Wu, Haiming

doi:10.1016/j.watres.2019.115285

Cited by 157 publications

(26 citation statements)

References 58 publications

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“…[1][2][3][4]. Aquatic environments (e.g., lakes [5], rivers [6], reservoirs [7], and wetlands [8]) receive heavy metals in untreated or inadequately treated wastewater from domestic, industrial, and agricultural sources. Pollution from heavy metals is inflicting rivers worldwide [9,10], especially in developing countries [11,12].…”

Section: Introductionmentioning

confidence: 99%

Risk assessment of heavy metals in the surface sediment at the drinking water source of the Xiangjiang River in South China

et al. 2020

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Background: The Xiangjiang River is an important drinking water resource for the Hunan Province of China. It is crucial to ascertain the pollution status, influencing factors, ecological risks, and possible sources of heavy metals in the sediments of the Xiangjiang River. Sediment is both a source and a sink of heavy metals in aquatic ecosystems. In this study, surface sediment was collected from the Zhuzhou Reach of the Xiangjiang River and eight heavy metals were investigated. Results:In all sediment samples, all eight heavy metals were detected and their average concentration fell in the order of Zn > Pb > As > Cu > Cr > Ni > Cd > Co. Assessment shows extremely serious Cd pollution and a very high potential ecological risk from Cd. According to correlation analysis and principal component analysis (PCA), As, Cu, Ni, Pb, and Zn originate from industrial wastewater and mineral smelting activities, whereas Co, Cr, and Ni come from natural sources. Redundancy analysis (RDA) reveals that the organic matter content and the particle size of the sediment have a certain influence on the enrichment of heavy metals. Conclusion:Among all eight examined heavy metals in the surveyed area, the content of Zn, Pb, and As is the highest, and that of Cd and Co is the lowest. Despite a low level of absolute content, the Cd in sediment already renders a high ecological risk and thus calls for urgent attention. Anthropogenic activities are the main source of heavy metals in the sediment. The distribution of heavy metals may also be influenced by sediment properties. The results provide guidance for controlling heavy metal pollution and protecting drinking water sources in the Xiangjiang River.

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Section: Introductionmentioning

confidence: 99%

Risk assessment of heavy metals in the surface sediment at the drinking water source of the Xiangjiang River in South China

et al. 2020

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“…[1][2][3]. Aquatic bodies, for example, reservoirs [4], rivers [5,6], estuaries and coastal [7,8], wetlands [9], and lakes [10], receive trace metals in inadequately treated or untreated wastewater from agricultural, domestic, and industrial sources. As an essential constituent in riverine and estuarine environments, sediments are a source and a sink of trace metals [11,12].…”

Section: Introductionmentioning

confidence: 99%

Eco-toxic risk assessment and source distribution of trace metals in surface sediments of the coastal and in four rivers estuary of Sarawak

Asare

Assim

Wahi

et al. 2022

Beni-Suef Univ J Basic Appl Sci

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Background Trace metals pollution in the coastal and estuarine sediment could harm water quality and aquatic organisms, leading to potential long-term health risks on the environment and humans. Thus, the purpose of this study was to conduct an assessment of selected trace metals in surface sediments of the coastal and in four rivers estuary in the Sarawak State of Malaysia to investigate their distribution, environmental risk, and potential source distribution. Results Average concentrations of trace metals in sediment increased in the following order: Cd ˂ As ˂ Co ˂ Cu ˂ Ni ˂ Cr ˂ Zn ˂ Mn ˂ Mg ˂ Fe. The enrichment, contamination, and geo-accumulation index results showed that surface sediments were polluted with Zn and Mg. In contrast, the other metals (i.e., As, Fe, Mn, Ni, Cr, Cu, Co, and Cd) indicated background concentration to minor contamination. Generally, the pollution load index values showed that almost all the sampling sites were unpolluted with the selected trace metals. Sediment quality guidelines (SQGs) and risk indexes were employed to assess the ecotoxicological risk of trace metal contamination in the sediments. The results proved that studied trace metals are not likely to have a deleterious impact on bottom-dwelling organisms. Still, a further accumulation of trace metals such as Zn, Ni, and Cr with time may adversely affect bottom-dwelling organisms. The risk index results showed a low ecological risk to the study sites. The correlation analysis and principal component analysis indicated that nine studied trace metals have strong interrelationships, suggesting common pollution sources or similar geochemical characteristics. Conclusions The study highlights the need to make tremendous efforts to monitor and control trace metal pollution in the coastal and estuarine areas.

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“…Nowadays, heavy metals (HMs) pollution mainly caused by human activities, due to its high toxicity, non-biodegradability, and persistence nature, has posed an increasingly serious threat to human health and the stability of aquatic ecosystems even at trace levels (Jia et al 2020, Yin et al 2019). Actually, compared with single HM pollution, combined HMs pollution (e.g.…”

Section: Introductionmentioning

confidence: 99%

The Positive Effects of Arbuscular Mycorrhizal Fungi Inoculation And/Or Additional Aeration On The Purification Efficiency of Combined Heavy Metals In Vertical Flow Constructed Wetlands

et al. 2022

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The extent to which, and mechanisms by which, arbuscular mycorrhizal fungi (AMF) and additional aeration (AA) purify wetlands polluted by combined heavy metals (HMs) are not well understood. In this study, vertical flow constructed wetlands (VFCWs) with the Phragmites australis (reeds)-AMF/AA were used to treat combined HMs-polluted wastewater. The results showed that (1) AA improved the AMF colonization in VFCWs, and AMF accumulated the combined HMs in their structures; (2) AMF inoculation and/or AA significantly promoted the reeds growth and antioxidant enzymes activities, thereby alleviating oxidative stress; (3) AMF inoculation and AA significantly enhanced the removal rates of Pb, Zn, Cu and Cd under the stress of high combined HMs concentrations comparing to the CK treatment (autoclaved AMF inoculation and no aeration), which increased by 22.72%, 30.31%, 12.64%, and 50.22%, respectively; (4) AMF inoculation and/or AA significantly promoted the combined HMs accumulation in plant roots and substrates, and altered the distribution of HMs at the subcellular level. We therefore conclude that AMF inoculation and/or AA in VFCWs improves the purification of combined HMs-polluted wastewater, and the VFCWs-reeds-AMF/AA associations exhibit great potential for application in remediation of combined HMs-polluted wastewater.

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Interactions of high-rate nitrate reduction and heavy metal mitigation in iron-carbon-based constructed wetlands for purifying contaminated groundwater

Cited by 157 publications

References 58 publications

Risk assessment of heavy metals in the surface sediment at the drinking water source of the Xiangjiang River in South China

Risk assessment of heavy metals in the surface sediment at the drinking water source of the Xiangjiang River in South China

Eco-toxic risk assessment and source distribution of trace metals in surface sediments of the coastal and in four rivers estuary of Sarawak

The Positive Effects of Arbuscular Mycorrhizal Fungi Inoculation And/Or Additional Aeration On The Purification Efficiency of Combined Heavy Metals In Vertical Flow Constructed Wetlands

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