A pilot-scale constructed wetland treatment system (CWTS) was designed and built to decrease the concentration and toxicity of constituents of concern in ash basin water from coal-burning power plants. The CWTS was designed to promote the following treatment processes for metals and metalloids: precipitation as non-bioavailable sulfides, co-precipitation with iron oxyhydroxides, and adsorption onto iron oxides. Concentrations of Zn, Cr, Hg, As, and Se in simulated ash basin water were reduced by the CWTS to less than USEPA-recommended water quality criteria. The removal efficiency (defined as the percent concentration decrease from influent to effluent) was dependent on the influent concentration of the constituent, while the extent of removal (defined as the concentration of a constituent of concern in the CWTS effluent) was independent of the influent concentration. Results from toxicity experiments illustrated that the CWTS eliminated influent toxicity with regard to survival and reduced influent toxicity with regard to reproduction. Reduction in potential for scale formation and biofouling was achieved through treatment of the simulated ash basin water by the pilot-scale CWTS.
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http://dx.doi.org/10.1016/j.chemosphere.2009.01.012 | DOI Listing |
Materials (Basel)
December 2024
College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China.
Gasification slag is the solid waste produced in the process of coal gasification. China produces approximately 30 million tons of gasification slag every year, which urgently needs to be recycled in an efficient and sustainable way. This paper discusses the feasibility of using gasification slag as a supplementary cementitious material (SCM).
View Article and Find Full Text PDFSpectral gamma ray borehole logging data can yield insights into the physical properties of lake sediments, serving as a valuable proxy for assessing climate and environmental changes. The presence of tephra layers resulting from volcanic ash deposition is not related to climate and environmental conditions. As a result, these layers pose challenges when attempting to analyze paleoclimate and environmental time series.
View Article and Find Full Text PDFWater Res
March 2025
Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; Hubei Provincial Engineering Laboratory for Solid Waste Treatment Disposal and Recycling, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; Hubei Provincial Research Center of Water Quality Safety and Water Pollution Control Engineering Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
Sewage sludge has great potential for phosphorus (P) recovery. However, sewage sludge-derived biochar suffers from low P bioavailability in land application. K, Ca-rich biomass ash was used to co-pyrolyze with sewage sludge to enhance P bioavailability of synthesized biochar.
View Article and Find Full Text PDFFront Plant Sci
November 2024
Institute of Crop Science, Department of Fertilization and Soil Matter Dynamics, University of Hohenheim, Stuttgart, Germany.
Introduction: Phosphorus recovery from waste streams is a global concern due to open nutrient cycles. However, the reliability and efficiency of recycled P fertilizers are often low. Biostimulants (BS), as a potential enhancer of P availability in soil, could help to overcome current barriers using recycled P fertilizers.
View Article and Find Full Text PDFSci Rep
November 2024
Key Scientific Research Base of Textile Conservation, State Administration for Culture Heritage, China National Silk Museum, Hangzhou, China.
Silk was the driving force behind the opening of the Silk Road, positioning this material as a global commodity that greatly influenced the progress of human civilization. Due to the natural protein properties of silk, the internal structure and external characteristics of silk cultural relics are irreversibly destroyed during the process of burial or when passed down through the generations until the production information and material components completely disappear, making it difficult to obtain direct archaeological evidence for pinpointing the origin of silk. The sacrificial pits at the Sanxingdui archaeologcal site, located in Guanghan, Sichuan, China, have been found with layers of ash above the layers of artifacts and some bronzes with fabric traces.
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