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By investigating the nitrogen concentrations in effluents of the horizontal subsurface-flow constructed wetlands under the conditions of different kinds of substrates, residence time and heights, as well as the nitrogen concentrations changes along the flow in the wetlands, the nitrogen removal routes in the wetlands were analyzed. The results demonstrated that the wetland system with zeolites demonstrated...
This paper investigated the spatial-temporal variations and pollution source of surface water quality by analyzing the data from 8 water quality monitoring stations along the middle and lower reaches of the Min River between 2003 and 2008. The results showed that surface water quality was worse in the middle reaches of the Min River than that in the lower reaches and its tributary. Seasonal and spatial...
This study investigated the effects of dissolved organic matter (DOM) extracted form maize straw on the mobility of Cr6+ in sandy soil and losses widespread in northwest region through simulated dynamic soil column system. The results indicated that the mobility of Cr6+ was influenced significantly by DOM in saturated water-soil system. Cr6+ had strong mobility because of weak adsorption and easily...
Along with the economy development and the industrialization progress quickly, watershed pollution in cities is growing seriously. It's difficult to achieve the goal of improving the water environment with the traditional water pollution control theory, as it's more emphasis on the end approach. Evolution of watershed relates to climate change, geological features, land use, animal changes, human...
Agricultural Non-point Sources Pollution is one of a leading cause of water quality problems in southeast of China. It is an effective approach for ANSP control that modeling nitrogen and phosphorus transfer in a basin system by using mathematic models based on geographic processes. In this paper, the multi-scale integrating distributed modeling frame was designed based on different spatial discretization...
Based on manganese content surpass the set standard seasonally in Jilihe reservoir's water, manganese content in the catchment basin of the river water, river sediment and the surrounding soil were analyzed, the environmental geochemical factors which impact manganese content were studied. According to the survey results, the reservoir water quality has obvious stratification: Dissolution of manganese...
Agricultural water resource, main body of regional water resources, was affected by multiple factors (e.g. landform, climate, precipitation and water system). Based on the investigation of water resources in the upper reaches of Minjiang, in order to scientifically manage and utilize agricultural water resource in this region, some feasible measures of sustainable exploitation were as follow: 1) expedite...
Growing switch-grass in a riparian buffer zone can be one of future best management practices in water resource protection. Switch-grass requires no fertilizers and less land and water. It was recently found to be a good source of biomass. In this study, Soil and Water Assessment Tool (SWAT) model was applied to a watershed to examine the effectiveness of buffer zones of switch-grass in reducing pollutants...
The main purpose of the research is to study the influence on shallow ground water by heavy metal in polluted river. In the lab-scale experiment polluted rivers were simulated by domestic sewage, and three kinds of natural sand were chosen as infiltration medium, it was found that Cr(VI) penetrated on the 13th day and then had a removal ratio of 77-99% in coarse sand, over 91% and 96% in two kinds...
Hydrological and water quality simulation faces big challenge because of intensive human activities in the Zhangweinan Canal sub-watershed of the Hai River basin. The Soil & Water Assessment Tools (SWAT) modeling system was established depended on various of spatial and attribute data of this watershed, and parameters for hydrological, water quality and evapotranspiration (ET) simulation were...
Formed by the stacking of solid waste from the coal industry emissions, the coal gangue dump brought about a series of ecological and environmental problems, such as the decrease of the quality of the air, surface water, groundwater and soil, ecosystem degradation, the losing of species diversity, the damage of landscape and the yield reduction of crops and so on. Therefore, the purpose of governance...
In this article, a series of ecological environment problems of Liaocheng city, such as the exploitation of groundwater, water-pollution, air pollution, noise, land salinization, and forest cover rate are discussed in details. Taking these problems into consideration, the author puts forward some feasible strategies and suggestions which can direct the development of eco-environment in a right way...
In this paper, the old simple Municipal solid waste (MSW) landfill pollution risk in China were analyzed. In order to control environment pollution, some countermeasures, such as constructing landfill cover, subsurface vertical barrier, installing bio-filter to reduce CH4 emission, pumping and treating the contaminated water, were working out and analyzed in detail.
Soil infiltration treatment was proved to be an effective and low-cost treatment technique for municipal wastewater in many areas. This system was intensified by combined stuffing (with zeolite, active carbon, sawdust and scrap iron) set for multilevel and named Vertical Multilevels Soil infiltration system (VMSI). Bench-scale soil column experiments were performed in laboratory to investigate effects...
The development and significance of the best management practice for controlling urban runoff quality are reviewed briefly. Several regular BMP types, together with their functions, removal efficiency of target pollutants, runoff volume control, design considerations, community acceptance and construction characteristics, etc. are described. The fuzzy hierarchy recognition model and computation procedures...
Soil treatment was proved to be an effective and low- cost treatment technique for decentralized effluents in the areas without perfect sewage systems. In this study, a shallow eco-soil treatment system (SES) was designed and operated to evaluate the feasibility and performances in treating sewage from a school campus for over a one-year monitoring period. The SES was built according to different...
The present conditions, causes of sandification and its impacts on the ecological functions of Xianghai wetlands have been studied. Results indicate that human irrational exploitation is the key cause of the sandification of the wetland. The ecological functions of the wetlands, for instance, in flood control, pollution filter, water purification, aquatic productivity, and habitat provision for a...
The main objective of this study was to construct and assess comparatively management scenarios in Zhangxi River watershed located in Zhejiang, China, applying the annualized agricultural nonpoint pollution source model (AnnAGNPS) integrating with ArcView GIS software. Parameter sensitivity analysis was performed, and those parameters that exerted a significant influence on the output variables were...
Riparian wetland is the major transition zone of matter, energy, and information transfer between aquatic and terrestrial ecosystems and has important functions of water purification and non-point pollution control. Using the field experiment method and isotope tracing technique, the agricultural non-point nitrogen pollution control function of Phragmites communis Trin in riparian wetlands was studied...
Clean drinking water plays a very important role in the health of a community. Providing safe drinking water to the people has been a major challenge for Romanian Government in order to achieve the goal of accession into the EU by 2007. The main purpose of this research was to investigate the chemical contamination of groundwater in a rural region from Cluj County, Romania. Samples of water from twenty...
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