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.

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Authors

Wu Z, Zhu L

Institution

Department of Environmental Science, Zhejiang University, Hangzhou 310028, China. wu-zh@zju.edu.cn

Source

Journal of environmental sciences (China) 24:2 2012 pg 248-53

MeSH

Adsorption
Biodegradation, Environmental
Biological Oxygen Demand Analysis
Color
Industrial Waste
Nitrogen Compounds
Phenols
Polycyclic Hydrocarbons, Aromatic
Thermodynamics
Waste Disposal, Fluid

Pub Type(s)

Evaluation Studies
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22655384