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Waterlogging is related to rainfall intensity as well as drainage network design. In previous studies, rainfall intensity was dominantly considered, while the design return period with the lowest total social investment of drainage networks was generally neglected. In this study, Guangkai Street in Tianjin in northern China was selected as a case study to determine the optimal design return period...
To explore the remediation feasibility of heavy metal pollution in wetland soil using a plant-microbial fuel cell (P-MFC) and the corresponding mechanism, a P-MFC system was constructed with in situ simulations of real wetland environment. By using Typhalatifolia L. as the trial plant, the electrochemical properties of the anode under different cadmium (Cd) concentrations are analyzed by cyclic voltammetry...
Based on the statistical data of 30 provinces in China from 2003 to 2014, this paper uses the spatial Durbin model to empirically test the influence of China’s urban environmental regulation on the introduction of foreign direct investment (FDI). The results show that there is significant spatial correlation between environmental regulation and FDI. Environmental regulation has a negative impact on...
Hydrological and nitrate pollution processes are important parts of aquatic ecosystems. For this study we collected samples of river water, reservoir water, shallow groundwater, deep groundwater, and precipitation in the Fenhe River Basin. δD and δ¹⁸O were used to identify the hydrological process. δ¹⁵N-NO₃⁻ and δ¹⁸O-NO₃⁻ were used to identify the sources and pollution process of NO₃⁻. The results...
Balancing sustained economic growth with energy security and environmental and climate change constraints is a common but difficult challenge. China, as the largest energy consumer in the world – 90% of which is fossil fuel-based – faces the enormous task of transforming its energy mix to low-emissions. CO₂ has been successfully injected for the purposes of both carbon capture and storage (CCS) and...
This paper analyzes the spatial distribution characteristics of carbon dioxide (CO₂) emissions in 30 Chinese provinces from 2002 to 2013, and systematically examines the relationship between government and CO₂ emissions from the level of regional legal regulation, the level of public expenditure, and corruption. Research results show that the global Moran’s I values of carbon emissions from 2002 to...
Based on the data of annual average values of PM₁₀ concentrations in China, this study empirically investigates the spatial autocorrelation of haze pollution in China and the mutual influence of energy consumption and foreign direct investment on haze pollution in China from 2004 to 2014 using the spatial econometric method. Moran’s I values are all above 0 during the 10 years, which indicates that...
In the present work we investigated the applications of chitosan as a bubble surface modifier in the coagulation dissolved air flotation (DAF) process for river water treatment. Zeta potentials of the residual colloidal particles in floated water and other typical water quality indexes measurements reinforced the fact that micro-bubble surface was successfully modified by dosing chitosan in a saturation...
The preparation of a Gd-doped Ti/SnO₂ anode using the sol-gel method was employed in electrolysis as an advanced treatment of coal chemical industry wastewater. The optimal Gd-doped content and sintering temperature were 2% and 750ºC. The electro-catalytic performance was enhanced after doping with an adequate amount of Gd. The doped Gd accelerated the generation rate and content of hydroxyl radicals...
This study focuses on soil heavy metal pollution and the potential ecological risks associated with mining activities. For this work we collected 83 topsoil samples and 11 soil profile samples from a typical abandoned Pb-Zn mining area in Hunan Province, China. Concentrations of Cd, Pb, Zn, Cu, and Ni were measured using Inductively Coupled Plasma Mass Spectrometry (ICP-MS), and As was analyzed by...
This work evaluates the efficiency of ammonium removal from piggery wastewater using a sequencing batch reactor (SBR) inoculated with a newly isolated strain of Pseudomonas putida HJH1. The strain HJH1 not only could survive and remove up to 72.4 mg/L NO₂⁻-N under aerobic conditions, but it also has good performance for simultaneous nitrification and denitrification (SND) with no nitrite accumulation...
This research included experiments on the advanced treatment of coking wastewater by electrochemical reactor. The results showed that a favorable operating condition could be obtained through the electrochemical course, when electrolysis time was 60 min, current density was 8 A, and electrode span was 1 cm. Under this condition, total organic carbon (TOC) removal efficiency could reach 73%, and the...
Increasing attention is being paid to spatial distribution characteristics of haze pollution and its relation with socioeconomic factors. This study investigates the spatial autocorrelation of haze pollution in China and the effect of foreign direct investment (FDI) on haze pollution in China using a panel data of 31 provinces over the period 2000-12. Using a widely used spatial autocorrelation index,...
Grazing exclusion with fencing has been widely implemented to rehabilitate degraded grasslands in China. However, the response of grassland ecosystems has remained controversial among sites and vegetation types. In this study, characteristics of vegetation and soil properties under degradation gradients (light and middle) and grazing exclusion were examined in the Maqin alpine meadow in August 2013...
In this research, constructed wetlands were applied to remove the nitrogen of lightly polluted wastewater from a wastewater treatment plant in Tangshan. The results showed that a favorable removal effect of nitrogen could be obtained through constructed wetland. Moreover, the aeration device added to the bottom could increase the removal rates of ammonia nitrogen in lightly polluted wastewater, but...
The simulated ammonia nitrogen wastewater was treated with spent mushroom compost (SMC) in a laboratory bioreactor (LBR), and shifts in microbial diversity in LBR were conducted by polymerase chain reaction and denaturing gradient gel electrophoresis (PCR-DGGE). We found that the removal efficiencies of NH4+-N and COD reached 73.4% and 61.7%, respectively, and that simultaneous nitrification and denitrification...
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