Study On Treatment Of Wastewater Containing Phonol By Complexation Extraction-adsorption Combined Process

In this dissertation,a research has been made on the complexation extraction-adsorption combined process and its application in the treatment of the wastewater containing high concentration phenol.The wastewater containing high concentration phenol was complexation extracted with tributyl phosphate(TBP) as extractant and n-octanol as diluent.The influences of the concentration of the extractant,the extraction time,pH and the phase ratio on the extraction rate were investigated.And the extraction mechanism and the thermal effect of the extraction process was proposed.Then the phenol in the extraction phase was reverse extracted and recovered with NaOH aqueous as stripping agent.The influences of the phase ratio,the extraction time and the concentration of NaOH aqueous solution on the reverse extraction rate were studied.The cationic sawdust cellulose was prepared with the sawdust cellulose as raw material and 3-chlorine-2-hydroxypropyl chloride(CTA) as an etherification modifying agent. According to the adsorption ratio on phenol,the preparation conditions were optimized.The structure of the product was characterized by infrared spectrum.The adsorption mechanism of the cationic sawdust cellulose on phenol was also proposed.The wastewater containing low-concentration phenol in the residual extraction phase was adsorbed with the cationic sawdust cellulose as an adsorbent.The effects of the amount of the cationic sawdust cellulose, pH,the adsorption temperature,the adsorption time and the initial concentration of phenol on adsorption eficiency of phenol were discussed.The results showed that the modified chemical adsorption existed in the adsorption progress of the cationic sawdust cellulose on phenol in aqueous solutions,and its adsorption capacity for phenol in aqueous solutions was obviously improved.The concertration of phenol in the wastewater can be decreased to below 0.5 mg/L by the complexation extraction-adsorption combined process,and meets the first grade criteria of integrated wastewater discharge standard(GB8978—1996).The process is simple,and the cost is cheap.Moreover,it is easy to be performed in factories.