This paper researched on the simulated flotation wastewater treatment technology. Experiments were performed by the operating manner of Anaerobic-BAC. Compared with natural photo degradation, the treatment effect of A...
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This paper researched on the simulated flotation wastewater treatment technology. Experiments were performed by the operating manner of Anaerobic-BAC. Compared with natural photo degradation, the treatment effect of Anaerobic-BAC was obvious. The experimental results show that the biodegradability was greatly improved, the B/C could be increased from 0.09~0.19 to 0.17~0.37. Under this experimental condition, the optimum operation parameters of BAC process were determined as: the activated carbon-water ratio 2:1, air-water ratio 3:1, HRT 4h. After processing, the concentration of COD was lower than 100 mg/L, and the removal efficiency was higher than 70%.
This paper researched on the simulated flotation wastewater treatment technology. Experiments were performed by the operating manner of Anaerobic-BAC. Compared with natural photo degradation, the treatment effect of A...
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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 nitrog...
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ISBN:
(纸本)9781424491728
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 greater efficiency in the removal of nitrogen. There was a higher nitrogen removal rates at the bottom of the wetland system owing to an aerobic-anoxic environment. In that a more efficient reoxygenation was attained at the front of the system, it achieved a higher nitrogen removal rates.
The iron and manganese absorption properties of several filter media were studied. Four plain filter media and six surface-modified media were examined. The surface modification was performed using potassium permangan...
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The iron and manganese absorption properties of several filter media were studied. Four plain filter media and six surface-modified media were examined. The surface modification was performed using potassium permanganate as a surface treatment. The surface-modified manganese sand was found to be most efficient at removing iron and manganese from water. The metal concentrations in filtered effluent were between 0.01 and 0.04 mg/L, which is far lower than the standard for recycle water. A concen-tration of 5% KMnO4 was found to be most effective as surface modifier. The surface of the manganese sand modified by 5% KMnO4 was examined and found to be covered with a dense membrane of some compound. The membrane had the advantages of uniform texture, large surface area and physical and chemical stability. It was effective at removing iron and manganese from mine water.
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