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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.


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.


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.


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.


Liu J.,Chongqing University | Li D.,Chongqing University | Li D.,Key Laboratory of the Exploitation of Southwest Resources | Li D.,State and local joint engineering laboratory
Research Journal of Chemistry and Environment | Year: 2011

In this paper, Anaerobic Baffled Reactor (ABR) was applied to treat the synthetic wastewater in the matrix of starch and glucose. Tlie reactor was started using low loading start-up, VLR controlled at 0.59 ∼ 11.05kgCOD/m 3.d. Some granular sludge appeared after running 18 days. The figure and size of granular sludge in each compartment revealed different characteristics due to the changing of OLRs and shear force between gas and liquid in each compartment. The COD removal efficiency was higher than 90% and steady when the reactor's start-up finished. When the anaerobic granular sludge appeared in the reactor, the VLR was 1.29kg COD/(m 3-d), COD removal efficiency was 83 %, hydraulic surface loading was 0.078m 3/m 2.h and an HRT was 30h The VLR had remarkable influence on COD removal efficiency, VFA, pH and ALK. When VLR was 5.57kgCOD/(m 3.d), COD removal efficiency and ALK were the minimum, VFA in the outflow exceeded lOOOmg/L, reactor's efficiency decreased. The reactor recovered after adjusting VLR and ALK value. Compared with the third and fourth compartments, the first and second compartments were less sensitive to changing of VFA. When pH deviated from adapt range, the COD removal efficiency decreased obviously, so pH value was kept in range of 6.2 to 6.5 for the later stage of experiments.

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