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J Environ Sci (China)

Title:		Removal of polycyclic aromatic hydrocarbons and phenols from coking wastewater by simultaneously synthesized organobentonite in a one-step process
Author(s):		Wu Z; Zhu L;
Address:		"Department of Environmental Science, Zhejiang University, Hangzhou 310028, China. wu-zh@zju.edu.cn"
Journal Title:		J Environ Sci (China)
Year:		2012
Volume:		24
Issue:		2
Page Number:		248 - 253
DOI:		10.1016/s1001-0742(11)60780-8
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"The optimal condition for a one-step process removing organic compounds from coking wastewater by simultaneously synthesized organobentonite as a pretreatment was investigated. Results showed that sorption of organic compounds by organobentonite was positively correlated to the cation surfactant exchange on the bentonite and the octanol-water partition coefficient (Kow) of the solutes. With 0.75 g/L bentonite and 180 mg/L (60% of bentonite cation exchange capacity) cetyltrimethylammonium bromide, the removal efficiencies of the 16 polycyclic aromatic hydrocarbon (PAHs) specified by the US Environmental Protection Agency in coking wastewater except naphthalene were more than 90%, and that of benzo(a)pyrene was 99.5%. At the same time, the removal efficiencies of COD(Cr), NH3-N, volatile phenols, colour and turbidity were 28.6%, 13.2%, 8.9%, 55% and 84.3%, respectively, and the ratio of BOD5/COD(Cr) increased from 0.31 to 0.41. These results indicated that the one-step process had high removal efficiency for toxic and refractory hydrophobic organic compounds, and could improve the biodegradability of the coking wastewater. Therefore it could be a promising technology for the pretreatment of toxic and refractory organic wastewater"
Keywords:		"Adsorption Biodegradation, Environmental Biological Oxygen Demand Analysis Color Industrial Waste Nitrogen Compounds/isolation & purification Phenols/*isolation & purification Polycyclic Aromatic Hydrocarbons/*isolation & purification Thermodynamics Waste;"
Notes:		"MedlineWu, Zhenhua Zhu, Lizhong eng Evaluation Study Research Support, Non-U.S. Gov't Netherlands 2012/06/05 J Environ Sci (China). 2012; 24(2):248-53. doi: 10.1016/s1001-0742(11)60780-8"