Study on the Treatment of Compound Micro-Polluted Groundwater by Contact Oxidation Process under Different Filtration Rates

Abstract:

The compound micro-polluted groundwater was treated by three-stage contact oxidation filters with total 1.5m ceramic layer. The filtration rates, in accordance with the time sequence, were respectively 1m/h, 1.5m/h, 2m/h, 3m/h and 4m/h. The result indicated that, in the condition of sufficient dissolved oxygen, the effluent concentration of iron, manganese, ammonia nitrogen and COD_Mn can met the National Drinking Water Standards. Under the range of filtration rates the average effluent concentration was respectively that 0.073 mg/L, 0.278 mg/L, 0.229 mg/L, 0.172 mg/L and 0.199mg/L for iron; 0.150 mg/L, 0.180 mg/L, 0.110 mg/L, 0.150 mg/L and 0.359 mg/L for ammonia nitrogen. The average concentration of manganese was 1.828mg/L with dropping aeration only, compare with that 0.323mg/L with strengthening aeration under filtration rate 1m/h. And the manganese concentration was 0.061mg/L, 0.062 mg/L, 0.084 mg/L and 0.071 mg/L, respectively under the range of filtration rates of 1.5-4m/h by strengthening aeration. Because of the biological system in filter layer no perfect, humic acid and low temperature, the average removal rate of COD_Mn was only 16.10% under the 1m/h filtration rate. Then when the rates were up to 1.5m/h-3m/h, effect of COD_Mn removal increased and the water treated met the Standard with the maturity of filter layer. But under the rate 4m/h COD_Mn concentration of effluent was exceed the Standard. Meanwhile, in the range of 1m/h-3m/h, consumption of dissolved oxygen respectively were 19.26mg/L, 14.73mg/L, 13.99mg/L and 13.99mg/L.

• Periodical: Applied Mechanics and Materials (Volumes 580-583)
• Pages: 2370-2373
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.580-583.2370
• Online since: July 2014
• Authors: Yu Hua Zhao, Jie Cheng, Xu Yan*, Di Wang
• Keywords: Compound Micro-Polluted Groundwater, Contact Oxidation Filtration, Iron, Manganese

References

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[2] A. G. Tekerlekopoulou, D. V. Vayenas. Biological Engineering Journal. Vol. 39(2008), p.215.

[3] Chunna Zhang. Antagonism of Iron and Manganese in Groundwater to Micro Contaminants in Aeration-Contact Oxidation Filtration Process, School of Municipal and Environmental Engineering, Shenyang Jianzhu University in Chinese (2012).

[4] Yan Li. Research on Treatment Regularity of Iron and Manganese as well as Contaminants from Underwater with Biological Filter, School of Municipal and Environmental Engineering, Shenyang Jianzhu University in Chinese ( 2011).