Treatment Of Coking Wastewater By Simultaneously Synthesized Organobentonite In A One-step Process

Based on the review of the application of organobentonite in wastewater treatment and treatment technology for coking wastewater, this thesis selected phenols and polycyclic aromatic hydrocarbons (PAHs) as model organic pollutants in coking wastewater and investigated the sorption of them into organobentonite in the one-step process. The pretreatment and advanced treatment of coking wastewater were also investigated, which may provide a new approach to treat coking wastewater. The main results of this thesis were as followed:(1) The removal rates of phenol,1-chlorophenol,2,4-dichlorophenol, 2,4,6-trichlorophenol,1-naphthol, phenanthrene, pyrene and benzo(a)pyrene by organobentonite in the one-step process positively correlated to the octanol-water partition coefficient (Kow) of the solutes and sorption amount of cation surfactant on the bentonite.(2) The pretreated and advanced treatment of coking wastewater by one-step process was investigated. In the pretreatment, the one-step process had high removal rates of refractory hydrophobic organic compounds. When CTMAB dose was 0.6 CEC, the average removal rate of polycyclic aromatic hydrocarbons (PAHs) was 95%, that of benzo(a)pyrene (BaP) was 99.5%, the removal rates of CODCr and Colour by one-step process were high, the ratio of BOD5/CODCr enhanced 0.1, the biological efficiency increased 9.4%. In the advanced process, the removal rates of refractory hydrophobic micropollutants were high. When CTMAB dose was 0.6 CEC, the removal rates of phthalate esters and PAHs were all more than 90%, that of BaP was 99.7%, whose concentration was much lower than the discharge standard requirement.