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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...
Dissolved organic matters in organic-polluted raw water and their potential to from disinfection by-products during drinking water treatment raise great challenges to the traditional water treatment process. Although many pre-treatment and post-treatment methods have been widely studied to improve the water quality of tap water, these methods are more or less constrained by the public finance or the...
In this study, we have investigated the effect of pollutants removal of a vertical multilevel soil infiltration (VMSI) system on municipal wastewater treatment. The VMSI was of 30cm*20cm*50cm column, in which combined stuffing consisted of soil, quartz sand, active carbon and scrap irons were packed. As a result, VMSI system exhibited excellent removal efficiency with 91.7% of COD, 98.4% of NH4+--N,...
Trichloroethene (TCE), usually in the form of dense non-aqueous phase liquid (DNAPL), is a widely used degreasing ingredient causing profound soil and groundwater contamination. While bio-enhanced dechlorination of TCE to harmless Ethene is a promising technique for waste water treatment, the mechanism and related phenomenon have not been thoroughly understood, especially in groundwater. A comprehensive...
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...
This study has investigated the effect of humus soil activated sludge on the nitrogen and phosphorus removal. The results from experiments indicate that humus soil SBR (HS-SBR) process did not have a better effect on the COD removal compared it with SBR process. They had about 89% removal efficiency on average. HS-SBR process could enhance the removal of nutrient salt, especially TP. The removal efficiency...
The treatment performances of capillary infiltration system fed by municipal wastewater were investigated in this paper. The composite fillers were constructed in capillary infiltration system to reach the prospective treatment effects. Compared to the single filler, composite filler promoted the ventilating condition and improved the distribution situation. The higher treatment efficiencies of NH...
A column experiment was conducted to investigate the release of colloids in water-saturated porous media, and the mechanism for the permeability of the water-bearing media changed by release of colloids are discussed. The research results showed that the accumulative amount of colloid particles release in effluent from water-bearing media increased with increasing pH. The accumulative amount of colloid...
Humus soil activated sludge (HSAS) process and conventional activated sludge (CAS) process of 400 L/day capacity were set up in lab to evaluate their performance. This study mainly focused on testing Nitrogen and phosphorus removal efficiency and settleability and dewaterability of sludge. The research shows that HSAS process could enhance the removal of nutrient salt, especially TP. It enhanced NH...
Reclaimed water is the valid approach to solve the problem of water resource scarcity and prevent secondary pollution. Based on the case study of Gaobeidian sewage treatment plant of Beijing, the security of agricultural environment of reclaimed water irrigation was studied by statistic analysis of water quality and irrigation experiment. With the case study of Gaobeidian Sewage Treatment Plant of...
The extensive clayization of Dexing copper mine is responsible for water and soil pollutions because of the oxidation of sulfide minerals. During the clayization, harmful elements such as As, S, Sb and Pb could be effectively released into the clay and water. Using the abundant spectral information of short wave infrared (SWIR), combining with the spectral absorbed index, SAM (Spectrum Angle Mapper)...
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