The Integration Of Dynamic Membrane Pilot System And The Preparation And Characteristics Of Membrane-forming Materials

The treatment of printing and dyeing wastewater has always been a troublesome problem.The traditional process model is difficult to effectively treat the refractory organics in the water,and there is an urgent need for advanced treatment processes to further improve the water quality to meet the rising discharge standards.As a high-efficiency and low-cost water treatment process,dynamic membrane technology has the potential to play a huge application value in the advanced treatment of printing and dyeing wastewater.In this study,a pilot-scale pre-coated dynamic membrane reactor system was constructed,and activated carbon was used as a material to pre-coat a dynamic membrane,and the printing and dyeing wastewater was deeply treated to study the effectiveness and economics of dynamic membrane technology.However,the specific adsorption capacity and functionality of activated carbon are limited,so it is necessary to explore new types of film-forming materials to cope with different water quality.In order to improve the applicability of dynamic membrane technology,this research also used chitosan(CS),Fe₃O₄and MgO to develop a new composite material used as a film-forming material,and used a series of characterization and adsorption experiments to explore the various functional properties of this material.From the experimental results:(1)When this pilot-scale reactor is used for advanced treatment of printing and dyeing waste,the best pre-coating operation is to use 300 g activated carbon(200 mesh)as the pre-coating agent and pre-coating for 90 s with a flow rate of 70 L/min to form a dynamic film.The reasonable backwashing methods are respectively external backwashing for 90 s,internal and external backwashing for 90 s and external backwashing for 90 s.This pilot reactor has a relatively stable wastewater treatment effect,with a treatment efficiency of56.13%(wastewater initial COD_Cris 72 mg/L?78 mg/L),and the treatment cost is 1.82yuan/ton.(2)The synthesized new film-forming material MgO-MCS has adaptively adjusted adsorption capacity,and can exert a relatively stable adsorption capacity in wastewater with different initial p H.The material also has good antibacterial activity,can effectively remove harmful microorganisms in the water,and ensure the safety and sanitation of the water.The adsorption of congo red and methyl orange by the material is a complex physical and chemical process,which is affected by the combined effects of van der Waals forces,electrostatic interactions and hydrogen bonds.In short,dynamic membrane technology has good treatment effects and economic cost advantages when used for advanced treatment of printing and dyeing wastewater.The new functional film-forming material synthesized in this study has good adsorption properties,antibacterial properties,magnetic properties and self-adaptive adjustment capabilities,and has the potential to improve the applicability of dynamic membranes,which is conducive to the popularization and application of dynamic membrane technology.