Publications by authors named "Siping Niu"

Article Synopsis
  • Geochemical baselines (GBs) are important for understanding how pollution affects elemental composition in the environment, but their use for assessing heavy metal contamination in sediments is still lacking in research.
  • This study focused on urban water systems in Ma'anshan City, China, analyzing sediment samples for heavy metals and utilizing statistical methods (RCF and 2σ-I) to derive GBs and measure pollution levels.
  • Results showed significant local pollution sources, especially in industrial areas, contributing to heavy metal concentrations, with zinc being the most accumulated metal, highlighting the need for better management of urban water environments.
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Article Synopsis
  • Microplastics (MPs) are a rising environmental concern, and algae play a crucial role in transporting and potentially removing these pollutants from aquatic ecosystems.
  • The review discusses key processes such as retention, flocculation, deposition, and degradation of MPs by algae, noting that these interactions can be influenced by factors like algae type, MP characteristics, and environmental conditions.
  • It emphasizes the complexity of MPs-algae interactions and calls for more research to better understand the fate of MPs in aquatic environments.
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Since the urban stormwater inlet (USI) acts as a link in the migration of microplastics (MPs) in stormwater, sufficient information on MPs in USI sediments is very important for understanding urban diffuse microplastic pollution. In this study, the abundance and characteristics of MPs in the USI sediments of Ma'anshan City, China, were analyzed based on urban land use type. MPs were prevalent in the USI sediments, with the average abundances of 536.

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The impact of the steel industry on sediment heavy metal (HM) pollution in urban aquatic environments was investigated in a major iron ore-producing area (Ma'anshan) in China. The concentrations of Cd, Cr, Cu, Ni, Pb, and Zn were 9.68 ± 3.

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Research has already confirmed the occurrence of microplastics (MPs) in sediments of stormwater drain system (SDS). However, the microplastic pollution remains to be elucidated well in sediments, especially the spatio-temporal distribution and the impacts of MPs on microorganisms. In this study, the averaged abundance of MPs in SDS sediments was 479 ± 688 items·kg for spring, 257 ± 93 items·kg for summer, 306 ± 227 items·kg for autumn and 652 ± 413 items·kg for winter.

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Article Synopsis
  • Microplastics (MPs) have raised significant concern due to their harmful effects on ecosystems and their ability to absorb organic pollutants (OPs), which varies widely across different studies.
  • The review highlights that strongly hydrophobic MPs are particularly effective at adsorbing hydrophobic OPs, with primary adsorption mechanisms involving hydrophobic distribution and surface interactions.
  • Various factors such as the characteristics of MPs (like size and aging), the properties of OPs (like concentration and polarity), and environmental conditions (like temperature and pH) all play a crucial role in how effectively MPs adsorb these organic pollutants.
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The sink of microplastics (MPs) in sediments of urban rainwater drainage system (RDS) is of great concern, because the MPs deposited can be resuspended by flow disturbance. Previous research has confirmed the significant accumulation of MPs in sediments of urban RDS, but it remains poorly elucidated, such as pollution sources and influencing factors. In this study, we investigated the MPs in sediments from RDS of a university campus.

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The adsorption of microplastics (MPs) for metals in aquatic environment remains poorly understood due to the use of either commercial MPs, which have different property from the MPs in environments, or artificial solutions, which have not only the significantly higher concentration of metals than natural aqueous environment but also the different natures. In this study, we elaborated the adsorption throughout the aging process of plastic bag derived-MPs (initially 1-2 mm) by potassium persulfate (KSO) solution to metals in lake water. Comparatively, plastic bag derived-MPs had the highest adsorption capacity for Zn followed by Fe, Pb, Mn, Cr, Ni, Cu and Cd, which is not completely consistent with the literature.

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Microplastics (MPs), as an emerging contaminant, have attracted wide attention due to their potentially negative impact on the ecosystem. However, information on microplastic pollution in terrestrial environments, especially road dust, is still rare. In this study, the microplastic pollution in road dust from the Yushan District of Ma'anshan City was characterized.

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The mining areas have faced severe pollution by caustic metals. In this study, heavy metals (Cu, Zn, Cr, Cd, Pb and Ni) in the soil of an extremely large iron mine pit from Ningwu-Luohe metallogenic belt, one of the seven iron ore areas in China was characterized. SiO was predominant soil mineral composition as 57.

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In recent years, microplastics (MPs) in the environment has become a topic of increasing concern. In this study, typical urban lakes, such as Yushan Lake and Nanhu Lake in Maanshan City, were selected to study the physical morphology and spatial distribution characteristics of MPs in sediments in spring and summer and to explore the sources of MPs in the lakes. On average, MPs in sediments occurred with a content of (0.

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Article Synopsis
  • This study assessed microplastics (MPs) pollution in River Yongfeng sediments, finding concentrations between 0.5-16.75 mg/kg, indicating significant spatial variability.
  • The research identified that land-based sources, especially from business zones, significantly contributed to higher MP accumulation in sediments.
  • The majority of detected MPs were films, with Polyethylene (61%) and Polypropylene (24%) being the most common types, predominantly smaller than 1000 μm, and showing signs of weathering despite attempts to clean the samples.
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Article Synopsis
  • - The study analyzed highway-deposited sediment (HDS) throughout the seasons, finding that 71% of the sediment mass comprised particles between 63-830 μm in size, with their distribution fitting a gamma distribution model.
  • - Seasonal variations in pollutants showed that Autumn had the highest concentrations of chemical oxygen demand (COD) and nitrogen, while heavy metals like zinc, lead, and cadmium were notably elevated compared to local soil levels.
  • - The research indicates that smaller particles (under 250 μm) are significant carriers of pollutants, emphasizing the need to address HDS as a particular type of nonpoint source pollution distinct from urban road-deposited sediments.
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Article Synopsis
  • Constructed wetlands (CWs) are eco-friendly systems designed to treat stormwater pollutants, using a setup that combines sedimentation tanks and fill-and-drain wetlands.
  • The pilot study included five different CW designs with varying ratios of woodchip and pumice substrates, aimed at finding the most effective treatment for road runoff.
  • The results showed that while the overall efficiency of removing pollutants generally decreased with more woodchip, using a balanced mix of woodchip and pumice (like in CW-3 or CW-4) is crucial for optimizing pollutant reduction and achieving specific environmental goals.
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The occurrence and environmental risk of eight endocrine disrupting compounds (EDCs), namely dimethyl phthalate (DMP), diethyl phthalate (DEP), benzyl butyl phthalate (BBP), dibutyl phthalate (DBP), nonyl phenol (NP), bisphenol A (BPA), 17α-ethinylestradiol (EE2) and estrone (E1), from four water sources (Pingshantou, Wanfenggang, Shisi, and Shiyi) of Huai River (Huainan section) were investigated in this study. Except for DMP only found in Pingshantou, all of the selected EDCs existed widely in the source water. DMP, DEP, BBP, DBP, NP, BPA, EE2, and E1 had the ranges of nd (cannot be detected)-130 ng/L, 25-310, 76-1351, 431-1299, 215-627, 23-107, nd-0.

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Article Synopsis
  • - The study examined heavy metal concentrations (Cu, Zn, Cr, Ni, Pb) in the soil and plants of a restored coal-mining area in China, finding significant levels of Cr, Ni, and Pb compared to background values.
  • - Soil pollution analysis indicated varying degrees of contamination: none to medium for Cu and Zn, medium to strong for Cr, and medium for Ni, while the overall contamination was classified as intermediate.
  • - The research revealed that certain plants, such as Ligustrum lucidum and Weigela hortensis, are effective at accumulating harmful metals like Cr, Ni, and Pb, making them important species for the area.
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An investigation on free water surface wetland, which has an area of 0.23 ha and is employed to control the non-point source pollution from a watershed of 7.4 ha, was carried out to examine how the WQvr (the ratio of stormwater inflow volume to water quality volume (WQv)) affects the wetland treatment performance.

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This study was carried out to identify the filter performance of fibre filter module treating high-turbidity water at extremely high filtration rates (1000-2500 m/day). The effects of filter aid chemical (polyaluminium chloride (PAC)), filtration rate and particles size on filter performance were investigated. It was found that PAC was a crucial factor influencing the separation process.

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Article Synopsis
  • The study assessed the ecological effects of metal contamination in soil from the restored Panyi coal mining area in China, finding significant accumulation of metals like Zn, Cr, Ni, Pb, and Cd compared to normal regional levels.
  • Geo-accumulation indices showed low risk for Cu, Zn, Ni, and Pb, but a low to moderate risk for Cr and Cd contamination.
  • The impacts on various species were noted, with plants likely affected by Ni, birds by Zn, Pb and Cd, and mammals possibly influenced by Cd.
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A laboratory study was undertaken to pursue the filter performance of a micro-filter module employing highly porous fibre media under a high filtration rate (≥1,500 m/day), faster than that of any conventional filter process. The effects of filtration rate, head loss, raw water turbidity, and filter aid chemicals on filter performance were analysed. In spite of the extremely high filtration rate, the filter achieved an attractive efficiency, reducing the raw water turbidity by over 80%.

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In this study, the effect of sampling duration on the performance estimate for a stormwater wetland over both rainy and dry days was evaluated for the appropriate design of sampling duration. As the cumulative percentage volume (Vp), the ratio of cumulative stormwater volume concerning time to the total stormwater volume, varied between 60 and 100%, generally, the inflow total suspended solids, turbidity and total chemical oxygen demand (TCOD) event mean concentrations (EMCs) did not vary significantly, whereas the total nitrogen (TN) and total phosphorus (TP) EMCs were relatively stable. Compared to the inflow, the corresponding outflow EMCs changed much less as Vp changed.

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A half-saturated pilot-scale wetland planted with Acorus calamus was built to treat urban stormwater. The design comprises a sedimentation tank for pretreatment, and a vertical flow volcanic gravel wetland bed equipped with a recirculation device. Eighteen rainfall events were monitored in 2012.

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Article Synopsis
  • The study focused on how E. coli, an indicator microorganism, behaves in a stormwater wetland within the Keum River basin and its relationship with water quality.
  • Significant seasonal differences in E. coli density were observed in both incoming and outgoing water, with its decay influenced by various wetland components and environmental factors like pH and solar radiation.
  • The findings indicated that while conditions in the marsh wetland helped reduce E. coli levels, the polishing pond saw a prevalence of E. coli growth, highlighting the need for further research on pollution management.
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Article Synopsis
  • - The study aimed to create a vertical subsurface flow (VSF) wetland system using woodchips to manage stormwater pollution from livestock agriculture by testing various recirculation intervals.
  • - It found that while the system effectively reduced total suspended solids (TSS) and total nitrogen (TN) levels—improving significantly with longer recirculation intervals—there was potential for TSS increase due to woodchip properties.
  • - Overall, the wetland demonstrated good phosphorus removal and highlighted the effectiveness of woodchips as a substrate for nutrient control in livestock stormwater management.
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