Experimental Study On Waste Water By Adsorption-Oxidation

With the development of economy, speeding up the process of industrialization, the pollution discharged into the water load growing, the effluent of wastewater treated by common procedures is very difficult to meet the increasingly stringent environmental standards in China. Therefore, how to take effective measures to deal with wastewater discharge standards becomes a hot point in present studies. Practice has proven that a single wastewater treatment technology is more and more difficult to meet the request,and many united techniques have already studied and applied in the wastewater treatment, and obtain good processing effect, which is the development direction of wastewater treatment. This paper researched the effects of the Fenton reagent oxidation, the combined technology of Fenton reagent oxidation & activated carbon adsorption and activated carbon adsorption & electrolysis oxidation.In the research of simulated LAS wastewater treated by Fenton reagent oxidation technology, taking orthogonal DOE, it was researched that the prominence of catalyzed oxidation effects influenced by pH, Fe(II) quantity, H₂O₂ quantity and reaction time. The different designs showed different prominence of four factors. In conclusion, pH influenced the result mostly, following by FeSO₄ quantity and H₂O₂ quantity, reaction time took a little effect. While the single factor experiments research indicated that, to treat with the simulated LAS wastewater with COD concentration at 500mg/L, the best operation condition was pH value 3.0, 2mL/L H₂O₂ with quality concentration at 30%, 4mL/L FeSO₄ with concentration at lmol/L, action time 60min. the COD value of discharged water was under 100mg/L, the removal ratio of COD was more than 80%.In the research of simulated LAS wastewater treated by the combined technology of Fenton reagent oxidation and activated carbon adsorption, it was mainly tested that the effect treated by the active carbon adsorption and treated by the combined technology separately. The experiments showed that, the combined technology increased the treating effect than Fenton oxidation or active carbon adsorption. To treat with the simulated LAS wastewater with COD concentration at 500mg/L by Fenton reagent oxidation, granular activated carbon adsorption and Fenton & GAC, the removal ratio of COD were 68%,55%,85%. And it was found that the adding order of powder activated carbon before Fenton reagent had the best effect. While the treatment cost is 4 yuan/m³, the removal ratio of COD was 82.0%, 74.6%, 57.2% by Fenton & GAC, Fenton reagent oxidation and power activated carbon adsorption.In the research of the low polluted water treated by the combined technology of adsorption and electrolysis, it was tested that the treated effects influenced by granular size, SRT, electricity density. The experiments showed that, the better effect treated by adsorption electrolysis was under the condition of SRT 4.5min, granular size 2.5～4.0mm, and electricity density at 75A/m². The regeneration of active carbon by electrochemistry belongs to polarity three-dimensional electrolysis system, the substance on the active carbon granular was oxidized and deoxidized under the electrical field, the action products deviated from the granular pore and transferred into the electrolysis liquid. At last, the active carbon regeneration was finished. The action electricity was the crucial factor on the treating effect by adsorption electrolysis.The experiment of PCB wastewater treated by adsorption electrolysis showed that, Fenton reagent oxidation or combined technology of Fenton reagent oxidation & activated carbon adsorption could be the pre-treated or mainly technology in the PCB wastewater treatment, while adsorption electrolysis performed bad in the PCB wastewater treatment, it hardly used in the strengthening treatment in PCB wastewater.The mechanism analysis of organic compounds degradated by adsorption and oxidation showed that, granular activated carbon remove the pollutants mainly with physical adsorption, the mineralization of Fenton technology to pollutants is poor; the combined technology of Fenton & GAC can improve the efficiency of the Fenton's reagent, and increase the mineralizatal capacity for pollutants of combined technology; adsorption electrolytic oxidation capacity is inadequate, and difficult to degradate pollutants to become inorganic.In a word, adsorption oxidation treatment can use widely in the normal treatment of wastewater. While it was difficult used in the strengthening treatment of wastewater.