Article
Environmental Sciences
Junping Lu, Tingxi Liu, Xiao Hong Shi, Biao Sun, Shengnan Zhao
Summary: This study investigates the influence of changes in the overlying water environment on the internal nitrogen release from reservoir sediments in different seasons. A quantitative linear relationship was established between the intensity of nitrogen release and environmental factors of the overlying water. It was found that water temperature, dissolved oxygen, pH value, and hydrodynamic force were the key factors affecting nitrogen release from sediments. The findings suggest that nitrogen released from sediments becomes the main source of nitrogen nutrients in the reservoir during the ice-sealed period.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Environmental Sciences
Mariusz Kluska, Joanna Jablonska
Summary: In recent years, the negative consequences of human impact on the Earth's ecological environment, specifically heavy metal pollutants, have become increasingly visible and require control measures. This study investigated the presence and contamination levels of heavy metals in the Liwiec and Muchawka rivers in Poland. The results showed that heavy metals primarily accumulate in sediment, with higher concentrations in sediment compared to the water column. Surface sediments can serve as a potential source for heavy metal pollution. The data obtained from this study are important for researchers studying river systems and the local population.
Article
Environmental Sciences
Weijia Li, Shiguo Xu, Xiaoqiang Chen, Dongning Han, Baoquan Mu
Summary: This study analyzed the distribution and release behavior of nitrogen and phosphorus in sediments of a reservoir's water level fluctuation zone. The findings indicate that sediment is the primary source of nitrogen and acts as a sink for phosphorus in the overlying water. Factors such as water flow and dissolved oxygen affect the release of nitrogen and phosphorus from the sediments.
Article
Environmental Sciences
Shi JianChao, Yang Yongrui, Liu Fei, Huang TingLin, Yi Qitao
Summary: The study demonstrates that the innovative WLA system in a mildly eutrophic reservoir can effectively improve water quality, increase dissolved oxygen concentration, and inhibit the release of pollutants from sediments.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Environmental Sciences
Xiong Pan, Junqi Cao, Li Lin, Ziwei Yang, Lei Dong, Jingxiang Tao, Quanhong Li, Yuqiang Liu, Yucheng Zhang, Xuanmin Huang
Summary: Danjiangkou Reservoir, as a water source for the South-to-North Water Diversion Project in China, experiences variations in carbon, nitrogen, and phosphorus distribution and pollution assessments during different water periods. During the flood season, nitrogen pollution from peripheral nonpoint sources and phosphorus released by water exchange contribute to an increase in total nitrogen concentration. However, the total phosphorus and total organic matter contents decrease. The reservoir's internal pollution is found to be light with a small release amount, indicating it is not the main pollution source.
Article
Thermodynamics
Shaon Kumar Das, Goutam Kumar Ghosh
Summary: The study developed a hydrogel-biochar composite that can improve water retention capacity, decrease bulk density, and exhibit good N-P-K nutrient release performance. The composite has potential applications in soil conditioning, controlled release fertilizer carrier, and water preservation in drought-prone areas for a sustainable and pollution-free environment.
Article
Environmental Sciences
Reymar R. Diwa, Marlon Elvira, Custer C. Deocaris, Mayuko Fukuyama, Lawrence P. Belo
Summary: Laguna de Bay in the Philippines, the third largest lake in Southeast Asia, is a significant source of freshwater fish. However, unregulated discharge of industrial, domestic, and agricultural wastewaters has led to heavy metal contamination in the lake, which affects the toxicity of the popular Asiatic clam. The study found that the western part of the lake had higher concentrations of certain heavy metals in the sediment compared to the eastern part, and there were correlations between the sediment and the Asiatic clam.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Rui Min, Kai Ma, Hongwei Zhang, Jiaqian Zhang, Siyi Yang, Tianhong Zhou, Guozhen Zhang
Summary: This study systematically investigated the distribution of microplastics (MPSs) in the surface water and bank sediments of Liujiaxia Reservoir in the upper Yellow River for the first time. The results showed that the main types of MPSs in the reservoir were PET, PS, and PP, and the abundance ranged from 4.48 to 12.09 item/L in the surface water and from 447.27 to 1543.80 item/kg (dry weight) in the bank sediments. The study provides valuable data for future pollution control and management in the reservoir area.
Article
Environmental Sciences
Amirul Azuan Md Joni, Ferdius Mohamat-Yusuff, Nurhanin Aqila Mohammed Noor, Khairul Nizam Mohamed, Zulfa Hanan Ash'aari, Faradiella Mohd Kusin, Zufarzaana Zulkeflee, Syaizwan Zahmir Zulkifli, Ahmad Ismail, Aziz Arshad
Summary: This study investigated the spatial and temporal patterns of glyphosate, nitrate, and ammonia in bottom water in an active cockle farming area in Perak, Malaysia. The results showed that glyphosate and nitrate might be derived from an inland source, while ammonia may originate from lithogenic origins. Continuous monitoring is recommended.
MARINE POLLUTION BULLETIN
(2021)
Article
Environmental Sciences
Yuanzheng Zhai, Yifan Han, Xuelian Xia, Xindai Li, Hong Lu, Yanguo Teng, Jinsheng Wang
Summary: The study confirmed that the increase of organics in groundwater can intensify the release of Fe and Mn from aquifer sediments, leading to an increase in concentrations in groundwater. This provides a deeper insight into the geochemical effects of Fe and Mn in the natural environment, especially in the groundwater system.
Article
Engineering, Environmental
Lorena S. Miranda, Buddhi Wijesiri, Godwin A. Ayoko, Prasanna Egodawatta, Ashantha Goonetilleke
Summary: The study reveals that the mineralogical composition of sediments plays a crucial role in the adsorption and desorption of heavy metals. Particulate organic matter is the most influential nutrient in heavy metals adsorption in riverine environments, while particulate phosphorus is more significant in estuarine conditions. Dissolved nutrients do not have a significant positive effect on the release of heavy metals in riverine areas, but dissolved phosphorus increases the transfer of specific metals from sediments to overlying water in estuarine conditions.
Article
Multidisciplinary Sciences
Ke Zhao, Qian Wang, Shifeng Qian, Fengxiang Li
Summary: Due to rapid socioeconomic development, the increasing attention is being given to antibiotic and heavy metal pollution. This study assessed the hazards associated with antibiotics and heavy metals in the surface water of the Yitong River in Changchun. The results showed varying concentrations of antibiotics and heavy metals based on seasonal and spatial distribution. Ecological risk assessment and human health risk assessment models revealed the presence of high-risk levels of antibiotics and heavy metals, with children being more vulnerable to the health risks.
SCIENTIFIC REPORTS
(2023)
Article
Environmental Sciences
Zihao Fu, Zijin Hong, Junling Wei, Yukai Liao, Songlin You, Yifan Wang, Jianjing Lv, Huan Feng, Marek Kolencik, Xuexiu Chang, Yu Qian
Summary: This study investigates the sediment phosphorus fractionation, adsorption kinetics, and adsorption isotherm characteristics of two rivers in China, with the aim of exploring management options for maintaining river water quality. The results show that sediment phosphorus fractions and adsorption characteristics are closely related and can be affected by human disturbance. The findings provide useful guidance for protecting the drinking water source reservoir.
JOURNAL OF SOILS AND SEDIMENTS
(2022)
Article
Environmental Sciences
Meng Lu, Xiao-Dan Wang, Fu-Jun Yue, Zi-Han Liu, Zhi-Yu Shi, Ping Zhang
Summary: Due to the excessive exploitation of traditional energy sources, the attention paid to water energy has increased. Utilizing reservoirs in karst areas often leads to water quality issues, particularly nitrate accumulation. The expansion of the Muzhu Reservoir in a karst area resulted in a change in hydro-chemistry type and a decrease in rock background components in the water, leading to nitrate accumulation. Monitoring nitrate accumulation in karst reservoirs is important for maintaining water quality.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Chang Liu, Shiyan Wang, Xiaobo Liu, Huaidong Zhou, Budong Li, Yanliang Du, Liang Wang
Summary: This study presents a case study on the impact of hypolimnetic anoxia on water quality in Daheiting Reservoir. The release of total phosphorus in the sediments was found to be a joint effect of biological and chemical processes, with redox reactions in the anoxic zone boosting the release of phosphorus. Anoxia in the reservoir also led to an accumulation of ammonia nitrogen and an increase in the concentration of iron and manganese, which were major driving factors for their release.
WATER SCIENCE AND TECHNOLOGY
(2021)