Heavy metal fraction, pollution, and source-oriented risk assessment in biofilms on a river system polluted by mining activities

Xu, Hansen; Li, Chunyan; Chen, Wen; Zhu, Shijun; Zhu, Sheng; Li, Nihong; Li, Rufei; Luo, Xia

doi:10.1016/j.chemosphere.2023.138137

Cited by 19 publications

(4 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rainfall is concentrated from May to October each year, with trace elements from abandoned mining wasteland deposited in the ditch sediment. The degree of trace element pollution in these rivers is affected by seasonal rainfall, posing significant ecological risks [ 4 , 23 ]. In Lanping, several models of vegetation restoration and agriculture have been applied.…”

Section: Introductionmentioning

confidence: 99%

Wide Riparian Zones Inhibited Trace Element Loss in Mining Wastelands by Reducing Surface Runoff and Trace Elements in Sediment

Deng,

Li,

et al. 2024

Toxics

View full text Add to dashboard Cite

The diffusion of trace elements in mining wastelands has attracted widespread attention in recent years. Vegetation restoration is an effective measure for controlling the surface migration of trace elements. However, there is no field evidence of the effective riparian zone width in mining wastelands. Three widths (5 m, 7.5 m, and 10 m) of Rhododendron simsii/Lolium perenne L. riparian zones were constructed in lead–zinc mining wastelands to investigate the loss of soil, cadmium (Cd), copper (Cu), arsenic (As), lead (Pb), and zinc (Zn). Asbestos tiles were used to cut off connections between adjacent plots to avoid hydrological interference. Plastic pipes and containers were used to collect runoff water. Results showed that more than 90% of trace elements were lost in sediment during low coverage and heavy rainfall periods. Compared with the 5 m riparian zone, the total trace element loss was reduced by 69–85% during the whole observation period in the 10 m riparian zone and by 86–99% during heavy rain periods in the 10 m riparian zone, which was due to reduction in runoff and concentrations of sediment and trace elements in the 10 m riparian zone. Indirect negative effects of riparian zone width on trace element loss through runoff and sediment concentration were found. These results indicated that the wide riparian zone promoted water infiltration, filtered soil particles, and reduced soil erosion and trace element loss. Riparian zones can be used as environmental management measures after mining areas are closed to reduce the spread of environmental risks in mining wastelands, although the long-term effects remain to be determined.

show abstract

Section: Introductionmentioning

confidence: 99%

Wide Riparian Zones Inhibited Trace Element Loss in Mining Wastelands by Reducing Surface Runoff and Trace Elements in Sediment

Deng,

Li,

et al. 2024

Toxics

View full text Add to dashboard Cite

show abstract

“…Yunnan Jinding Zinc Industry Co., LTD., locating in Lanping area has the world's fifth largest lead and zinc mineral resources (Xu et al, 2023). Whereas, the unexploited lead and zinc resources reserve reaches 39.88 million tons, and the potential economic value is up to 50 billion yuan.…”

Section: Introductionmentioning

confidence: 99%

Chemical oxidation co-coagulation-flocculation for the flotation wastewater treatment of lead-zinc oxide ore from Lanping mine

Gong,

Guo,

et al. 2024

Physicochem. Probl. Miner. Process.

View full text Add to dashboard Cite

The flotation wastewater produced by "lead preferred flotation-zinc flotation" all-open process with aids of mixed depressants and cationic-anionic collectors has a high turbidity and multitude of reagent contaminants, and fails to meet the discharge standards. This study objective is to remove fine solid particles and flotation reagents in this wastewater by chemical oxidation co-coagulation-flocculation process. Results of chemical oxidation tests indicate peroxymonosulfate (PMS) exhibits superior performance on decreasing COD, and the COD remarkably decreases to 71.8 mg·L-1 with 100 mg·L-1 PMS addition after 120 min. Moreover, the combined oxidation of radicals (SO4•- and •OH) are responsible for degradation of flotation reagents (Na2S, DCCH, xanthates and amine) in the wastewater. Results of experimental factors confirm that the turbidity of wastewater decreases significantly from 124796 to 71.4 NTU, and the yield of water reaches above 90% with combined usage of lime (500 mg·L-1) and polyacrylamide (PAM, 50 mg·L-1). Besides, the contents of S, P, N, Zn Pb and Fe decrease, and meet the discharge standards. Results of zeta potential analysis suggest lime reduces the electrostatic repulsion between particles, and PAM plays a bridge link role between particles, accelerating the precipitation of suspended particle.

show abstract

“…These ions can be hazardous to the environment and human health because they could accumulate in living organisms and cause toxic effects 1 . With the development of global industrialization, heavy metal ion contamination is gradually becoming a severe environmental problem, 2,3 which comes from landfill leachate, 4 mining activity, 5 agricultural uses, 6 and industrial discharge 7,8 . Consequently, the removal of heavy metal ions is significant for sustainable development 9–11 …”

Section: Introductionmentioning

confidence: 99%

Construction of double cross‐linked networks in calcium alginate/poly‐N‐isopropylacrylamide hydrogel with photothermal responsiveness for absorbing heavy metal ions

Wang,

Zhao,

Wang

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

Hydrogels have been widely used for adsorbing heavy metal ions in wastewater treatment. Herein, a calcium alginate/poly‐N‐isopropylacrylamide double‐network hydrogel with photothermal responsiveness was prepared for adsorbing heavy metal ions in aqueous solution. The chemical composition, micromorphology, swelling properties, photothermal responsiveness, adsorption properties, and adsorption mechanism of gel microspheres were studied, respectively. The gel microspheres had an interpenetrating three‐dimensional porous structure, and their high porosity morphology and high specific surface area could ensure the adequate exposure of active adsorption sites. The gel microspheres showed excellent selective adsorption of Cr(III), and the theoretical maximum adsorption capacity of 146.16 mg/g was calculated according to the Langmuir model. Besides, its excellent photothermal conversion ability enhanced the resistance to external interference after the adsorption. Our work has provided an innovative approach to solar water purification while optimizing the preparation process.

show abstract

Heavy metal fraction, pollution, and source-oriented risk assessment in biofilms on a river system polluted by mining activities

Cited by 19 publications

References 48 publications

Wide Riparian Zones Inhibited Trace Element Loss in Mining Wastelands by Reducing Surface Runoff and Trace Elements in Sediment

Wide Riparian Zones Inhibited Trace Element Loss in Mining Wastelands by Reducing Surface Runoff and Trace Elements in Sediment

Chemical oxidation co-coagulation-flocculation for the flotation wastewater treatment of lead-zinc oxide ore from Lanping mine

Construction of double cross‐linked networks in calcium alginate/poly‐N‐isopropylacrylamide hydrogel with photothermal responsiveness for absorbing heavy metal ions

Contact Info

Product

Resources

About