The Study Of Advanced Oxidation Process Catalytic NaClO Oxidative And Degradation Parachlorophenol And Dyeing Wastewater

With the enlargement of the scale of production and the development of industrial technology,poisonous and harmful refractory organic wastewater pollution sources is increasing,and the dye wastewater is considered to be the main contributors of water pollution.The dye wastewater has the characteristics of high salinity,high COD values,deep chromaticity,refractory,high toxicity and big emissions ect.When the dye wastewater go into the nature it will directly or indirectly do harm to human,and destroy the balance of the ecosystem.Besides,national laws and regulations for emission standard is more and more strict,so the low cost and efficient wastewater treatment technology is urgent to be researched.This paper studies a kind of catalyst oxidant NaClO's advanced oxidation process to degrade organic wastewater,first of all to the p-chlorinephenol as the simulated wastewater examine the performance of catalyst,then put the catalyst loading on the carrier to degrade dye wastewater.This method has solved the problems of the life of the catalyst in the heterogeneous catalysis system and heterogeneous catalyst separation of complex problems in the system,and provide technology and data support for the degradation of dye wastewater.In the second chapter of the thesis,the work shows the degradation of p-chlorophenol in NaClO advanced oxidation system with CuMgFe powder catalyst which was prepared by Co-precipitation method,and the COD removal rate of p-chlorophenol as the standard to investigate the catalytic performance of CuMgFe powder catalyst.Then the preparation conditions of the catalyst and catalytic oxidation reaction conditions were optimized,including calcination temperature,the proportion of the active component,reaction temperature,the amount of catalyst,oxidant NaClO concentration and reaction time.In the end,determineing the calcination temperature was 400?,the best ratio of active components was Cu:Mg:Fe=0.1:0.25:0.125,the reaction temperature is 45?,the amount of catalyst is 50 mg,the concentration of oxidant NaClO is 5 mM,the reaction time is 60min.Under the best situations,the 100 mg/L of p-chlorophenol removal rate of COD is89.0%.In the third chapter of the thesis,the work shows the degradation of dye wastewater in NaClO advanced oxidation system with CuMgFe/Ceramic supported catalyst which was prepared by rotating impregnation method.Carrier is ceramic ball whose diameter is4-6 mm.The active groups of the ceramic catalyst is transition metal:Cu?Mg?Fe.Exploration the loading of activity groups,the initial COD of wastewater,oxidant concentration of NaClO and column temperature on the influence of dye wastewater COD removal rate,and determineing the best wastewater treatment process.In the fixed bed reactor loaded 440 g loading type catalyst which the loading rate is 5%,column height is100 cm,column temperature is 45?,flow velocity is 120 mL/h,retention time is 150min,the ratio of COD/NaClO is 0.5,and wastewater COD removal rate remained at about85%under the condition of optimum process after continuous uninterrupted use 66 days of catalyst.Besides,1)Oxidant of NaClO is low cost,strong oxidation ability,and providing alkaline environment ensures the low leaching rate of the metal ions.The leaching rate of Cu²⁺is 0.1 ppm,and Fe³⁺is 0.3 ppm,and the catalyst is stable and long service life;2)Putting loading type catalyst into the fixed bed reactor,not only save the complex separation step when the catalyst is recycle used,at the same time,the catalyst can treat wastewater continuously.Therefore,advanced catalytic oxidation technology facing the core issues,namely the life of the catalyst,here got the perfect solution.In short,mild reaction condition,catalyst stability and long service life,simple equipment,so can be used on a large scale.