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Chen G.,Chongqing University | Chen G.,Taiyuan University of Science and Technology | Li D.,Chongqing University | Li D.,Key Laboratory of the Exploitation | And 3 more authors.
Research Journal of Chemistry and Environment | Year: 2011

Computational Fluid Dynamics (CFD) was used to simulate the characteristics of concentration. The commercial CFD code Fluent, version 6.3, developed by Fluent/ANSYS was used for all calculations. The code uses a finite volume method based on discretization of the governing differential equations. This simulation study was carried on the concentration basin internal flow field using Fluent 6.3 software and the existing experience. Source


Binquan J.,Chongqing University | Binquan J.,Key Laboratory of the Exploitation | Binquan J.,State and local joint engineering laboratory | Xi P.,Chongqing University | And 2 more authors.
Research Journal of Chemistry and Environment | Year: 2011

Bath industry needs to consume the massive water resources, so it makes a lot waste. In this paper, we focus on treating bathing wastewater by electro coagulation-flotation. The experiment showed that COD, turbidity and NH3-N can be removed at a short time. Screening of water quality parameter, the anionic surfactant (LAS) is selected as the main controlling factor in experiment and the influence of current density, electrolyte dosages, pH and time on removal efficiency of LAS is analyzed. The removal efficiency of bathing wastewater is better in acid solution. Either current density or the concentration of NaCl should not be too high. If not so, it will appear as "corrosion spot" and will make a low treatment effect. Source


Xuecheng Z.,Chongqing University | Xuecheng Z.,Key Laboratory of the Exploitation | Guangzhi Y.,Key Laboratory of the Exploitation | Guangzhi Y.,State and local joint engineering laboratory | And 3 more authors.
Research Journal of Chemistry and Environment | Year: 2011

The study made interpolation analysis o/Cu in the influence area, and analyzed and evaluated its result. The result shows that there is uneven distribution of heavy metals in the area of influence of this slag field and a clear downward trend of soil heavy metals from the slag field to surrounding area. Cufits Gaussian distribution, the interpolation result shows that Original Kriging is the best for Cu. Cu has a high spatial correlation and it is mainly affected by structural factors. Source


Yang K.,Chongqing University | Yang K.,Key Laboratory of the Exploitation | Li D.,Chongqing University | Li D.,Key Laboratory of the Exploitation | And 5 more authors.
Research Journal of Chemistry and Environment | Year: 2011

By taking the fly ash from municipal solid waste in Chongqing as the research object, the moisture content, the components of the fly ash, the leaching toxicity and the corrosivily were analyzed. The experimental results showed that the fly ash was alkaline and the average moisture content value was 1.8. The moisture content was related to the temperature and the air humidity. By using the X-Ray fluorescence spectrometer, the elements in the fly ash were detected. According to the related atlas of the X-ray diffraction it mainly contains: SiO 2, KCl, CaO, MgO, Al 2O 3, CaCl 2. NaCl and some other kinds of metallic oxide. The heavy metal in the sample of fly ash existed in the form of thermometal chloride KPb 2Cl 2, and it also contained some PbSiO 2. Also, it can be seen that Zn, Cu, Cd existed in the form of chloride. Through the experiment, the Pb, Zn and Cd were out of limits in the fly ash and As and Cu were in the limits of the standard. The average leaching contents of Pb, Zn, Cd, Cu respectively were 4.25 mg/L, 157.4 mg/L, 0.16 mg/L, 10.1 mg/L. The leaching content of As was nearly the least in the leaching experiment. The net structure of SiO 2 can fasten and adsorb the heavy metals in the fly ash. It is easy to see that the pH values of the four samples are under the limit of 12 during the experiment. The average value of the corrosivity was 10.36. The fly ash was a kind of non-corrosive substance. When the pH value of leaching liquor was belween 6-8, the pH value of lixiviated liquor increased rapidly while the pH value of leaching liquor was bellow 6 or greater than 8, the pH value of lixiviated liquor changed smoothly. Source


Liu J.,Chongqing University | Liu J.,Key Laboratory of the Exploitation | Wang Q.,Chongqing University | Wang Q.,Key Laboratory of the Exploitation | And 3 more authors.
Research Journal of Chemistry and Environment | Year: 2011

In the present study, the pyrite smelting slag was fully investigated. Through experimental analysis, the environmental hazards of the waste residue have been discussed in order to identify the property of the residue. First, using the method of XRF scanning, the complex composition of the residue was detected and then determined that the primary contamination of heavy metals included the Copper, Cadmium, Zinc, Nickel, Lead, Chromium and Arsenic. In addition, it indicated that the waste residue still has a certain value for reuse. By the analysis of leaching toxicity and further investigation, it is illustrated that the slag lixivium has not exceeded the required standard. The Copper, Zinc and Nickel also exceeded the standard limit and the waste residue has certain influence on the surrounding environment. The leaching toxicity analysis suggested that the heavy metal of the residue was in low concentration. The pyrite smelting slag does not belong to hazardous wastes, further determined that the residue belongs to Class General Industrial Solid Waste. The main phase present in pyrite smelting slag was silicon oxide and contained four major phases. XRD spectra analysis has further indicated that the major phases of heavy metals were waste oxides and sulfate. Therefore, effective protection measures should be taken to prevent these potential risks. Source

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