Effect of Two-Phase Contact Oxidation on Enhanced Removal of Contaminants in Wastewater from Copper Mine

Abstract:

An improved two – phase contact oxidation adsorption integrated bioreactor (CABR) was used to treat mixed wastewater from copper mine. The CABR was made up of a biofilm reactor and an activated carbon reactor. Polyacrylonitrile balls (20 mm diameter, 260 m²/m³ specific surface, 90% porosity) were filled into the contact oxidation reactor as biofilm attaching materials. Hydraulic residence times (HRT) of the two contact oxidation reactor were 1.5 hr and 1.2 hr, separately. Relevant ratio of aeration and water of the two contact oxidation were 5:1 and 3:1. From the long-term operation, the average removal efficiencies of chemical oxygen demand (COD) and ammonia nitrogen (NH₄⁺-N) were 84.1% and 71.3% respectively. Two – phase contact oxidation can achieve the higher removal efficiency and the lower power consumption. Additionally, the activated carbon reactor can significantly remove heavy metal.

• Periodical: Advanced Materials Research (Volumes 183-185)
• Pages: 1404-1407
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.183-185.1404
• Online since: January 2011
• Authors: Gang Li, Ke Qing Li, Li Li Liang
• Keywords: Activated Carbon (AC), Chemical Oxygen Demand (COD), Contact Oxidation, Heavy Metal

References

[1] B H Lee, W C Song, B Manna, J K Ha. Dissolved ozone flotation (DOF) — a promising technology in municipal wastewater treatment. Desalination, Vol. 225 (2008), pp.260-273.

DOI: 10.1016/j.desal.2007.07.011

[2] X J Wang, S Q Xia, L Chen, J F Zhao, N J Renault, J M Chovelon. Nutrients removal from municipal wastewater by chemical precipitation in a moving bed biofilm reactor. Process Biochemistry Vol. 41 (2006), pp.824-828.

DOI: 10.1016/j.procbio.2005.10.015

[3] M Ksibi. Chemical oxidation with hydrogen peroxide for domestic wastewater treatment. Chem. Eng. J. Vol. 119 (2006), pp.161-165.

DOI: 10.1016/j.cej.2006.03.022

[4] F J Cervantes, S G Pavlostathis, A C van Haandel. Advanced Biological Treatment Processes for Industrial Wastewaters: Principles and Applications, IWA Publishing, (2006).

DOI: 10.2166/9781780402345

[5] M Rodgers, X M Zhan, B Gallagher. A pilot plant study using a vertically moving biofilm process to treat municipal wastewater. Bioresour. Technol. Vol. 89 (2003), p.139–143.

DOI: 10.1016/s0960-8524(03)00043-9

[6] Y Liu, B Capdeville. Specific activity of nitrifying biofilm in water nitrifica-tion process. Water Res. Vol. 30 (1996), p.1645–1650.

DOI: 10.1016/0043-1354(96)00069-3