Treatment Of Salt-Containing Organic Waster By Actvated Carbon Adsorption

Salt-containing organic wastewater is the key and difficult point of wastewater treatment in China at present.Activated carbon adsorption treatment of such wastewater is not only free from the influence of salt,but also can absorb a large amount of organic matter in wastewater,reduce the chemical oxygen consumption of wastewater,and when the wastewater continues to evaporate,relatively pure inorganic salt can be obtained.However,the poor renewable capacity of activated carbon leads to high cost of wastewater treatment,limited adsorption capacity of activated carbon and poor adsorption capacity.In this paper,the preparation and further modification of columnar activated carbon from lignite were studied.Firstly,the columnar activated carbon with good performance was prepared by grinding,kneading,carbonization and activation of lignite,a low-cost raw material.In the second step,the activated carbon was modified by nitric acid oxidation and amination on the surface of activated carbon.The surface of activated carbon was oxidized by nitric acid under ultrasonic wave.After the oxidation modification,some activated carbon underwent acylchlorination reaction.SEM results showed that after acidification,the surface of activated carbon became smooth and pore channels became clear.After grafting,there were cluster particles on the surface and mesoporous of activated carbon.FTIR analysis showed that amine groups were grafted on the activated carbon.The surface structure,element type and content of modified activated carbon were characterized by X-ray photoelectron spectroscopy.N element peak appeared in the characterization results.Secondly,the activated carbon was applied to the treatment process of rubber accelerator CBS,NS,and DZ wastewater to reduce the treatment cost of the process.The process flow was optimized by changing the adsorption temperature,the amount of activated carbon,pH value,adsorption time and other conditions.The experimental results show that activated carbon adsorption CBS wastewater treatment,NS wastewater and the best condition of DZ wastewater is:adsorption temperature of55?,the amount of activated carbon to 1 g/100 mL,pH=4,stirring adsorption 120min,CBS wastewater and NS wastewater COD removal rate of 90%above,DZ wastewater to evaporation with COD removal rate can reach more than 95%.Then,phenolic wastewater was treated by Fenton oxidation combined with activated carbon.Dispatch pH of 7,n?H₂O₂?:n(Fe²⁺)=6:1,Fenton reagent dosing amount 5%of the amount of waste water,Fenton oxidation effect best,activated carbon adsorption dynamic dispatch pH to 4,the temperature control for the room temperature is about 25?,flow rate of 3 bv/h,the removal rate of COD reached a maximum of 83.3%.Finally,the effects of the ratio of carbon to alkali,alkali concentration,regeneration temperature,regeneration time and flow rate of analytical solution on the regeneration of activated carbon were discussed.The experiment shows that the adsorption capacity of activated carbon after regeneration is basically unchanged.In the repeated regeneration experiment,activated carbon with two kinds of saturated adsorption is regenerated for more than 10 times,and its regeneration rate still exceeds80%.