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Jiao B.-Q.,Chongqing University | Li D.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam
Advanced Materials Research | Year: 2011

The influence of HRT , oxidic time and anoxidic time on the carbon and nitrogen removal of integrated oxidation ditch with continuous flow and intermittent aeration was studied by cross experiment method. The results show that the anoxidic time has the most distinct influence on removal ratio of BOD5 and TN in the system and the oxidic time has a distinct influence on BOD5 as well .When HRT , oxidic time and anoxidic time of the system is 8h , 2 h and 2 h respectively , the effluent quality and the removal ratio for BOD5 are <20 mg/ l and 85. 2 % and for TN are < 20 mg/ l and 55. 5 % respectively. Source


Zhonghui X.U.,Chongqing University | Zhonghui X.U.,Southwest University of Science and Technology | Peng X.I.,Chongqing University | Dongwei L.I.,Chongqing University | And 2 more authors.
Disaster Advances | Year: 2010

Ancient pyrometallurgical zinc generated large amounts of slag. Natural leaching from ancient pyrometallurgical zinc sites has contaminated the soil closed to the deposits. Electrokinetic removal was used to treat this slag. In this study, in order to evaluate the migration of heavy metals in electrokinetic removal, Visual minteq was adopted to calculate the species distribution of heavy metals in different pH. When pH is between 9.0 and 11.0, Zn(OH)2 is the main species. Cd(OH)2 is the main species when pH is between 9.0 and 13.0. Hydroxide precipitation of zinc and cadmium was the main reason to restrict their migration. Arsenate always exist as an oxyanion such as AsO 4 3- , H2AsO4 HAsO4 2. Copper exists as anion form above pH 8. The enrichment of arsenic and copper near the anode occurred. Hiis is probably due to the electromigration of negatively charged arsenic and copper ions towards the anode which would be faster than electroosmotic flow in the opposite direction. In a word, because of the heavy metal's enrichment in sample sections, the final removal efficiency rate of heavy was low. Some enhanced technology must be adopted to improve the removal efficiency rate. Source


He B.,Chongqing University | He B.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam
Applied Mechanics and Materials | Year: 2014

Based on continuum damage mechanics, by defining the initial and critical damage value, because of the plastic volumetric strain of the specimen, we established the calculation methods of the rock specimen’s damage value. Through the conventional triaxial compression test of the shale, we find that damage value D changes as axial strain changes during compression, and summarizes its variation. © (2014) Trans Tech Publications, Switzerland. Source


Li D.,Chongqing University | Li D.-W.,Chongqing University | Li D.-W.,Key Laboratory of the Exploitation of SW Resources and the Environmental Hazards Control Engineering | Li D.-W.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam
Advanced Materials Research | Year: 2011

The cyclohexanone production wastewater includes hazardous material such as cyclohexanone and cyclohexane which can harm the vessel of human body resulting in coagulation necrosis of viscera and brain. Our experiment choosed the cyclohexanone production wastewater to be investigated, and used the self-made anaerobic upflow bed filter (UBF) to deal with it. We try to find the optimal operational parameters which can make the degradation of hazardous materials maximizing. The COD removal efficiency was decreasing with the COD of influent's increasing in starting stage, the shock load made the microbe in UBF can't adapt the high VLR temporarily. In the running stage, the anaerobic sludge in UBF was incompact and the settleability of sludge was not very well. As the UBF running, the granular sludge shaped up greatly, the COD removal efficiency kept on 80%. The result showed that the UBF reactor was valid for hazardous material in cyclohexanone production wastewater. Source


Liu J.,Key Laboratory of the Exploitation of SW Resources and the Environmental Hazards Control Engineering | Li D.,Key Laboratory of the Exploitation of SW Resources and the Environmental Hazards Control Engineering | Li D.,State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam | Chen G.,Key Laboratory of the Exploitation of SW Resources and the Environmental Hazards Control Engineering
Disaster Advances | Year: 2010

The present research takes pyrite smelter slag as the research object. Through sampling collection and experimental analysis on the waste residue and the surrounding soil, the environmental hazards of the waste residue has been investigated so as to identify the property of the waste residue. Firstly, the research identified the complex composition of the waste residue and ultimately determined the pollution factor of heavy metals through XRF scanning. By using the total amount analysis of soil sample, the content of Zinc, Copper, and Lead metal was high with strong toxicity. On the other hand, it revealed that the waste residue still has certain values of re-use. By comparing heavy metal amount in soil with soil quality standard, the arsenic content in each site has exceeded the standard. Hie Copper, Zinc and Nickel also were over the standard limit, and the waste residue has certain influence on the surrounding environment. In the experiment of leaching toxicity analysis, it is indicated that the heavy metal value of the waste residue was very low, thiobacillus ferrooxidans were sort out from the water sample in the experiment. The pyrite smelter slag does not belong to hazardous wastes, further determined that the waste residue belongs to Class II General Industrial Solid Waste. However, the waste residue brings about pollution to local environment, and poses much potential safety hazards to downstream residents, farmlands and livestock, food security and drinking water. Hierefore, effective protection measures should be taken to these potential risks. Source

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