Study On The Preparation Of Modified Micro-electrolysis Materials And The Treatment Of Dyeing Wastewater

The iron-carbon micro-electrolysis method has the characteristics of a wide range of raw materials,low cost,and a wide range of treatment.It is used for wastewater treatment in various industries such as papermaking,printing and dyeing,and pharmaceuticals.Because the traditional micro-electrolysis method is a simple mixture of iron and activated carbon,the material is hardened and the device is blocked during actual use,and the reaction rate is low,and the removal rate of organic matter is not high.In view of the above problems,this research aims to use bentonite as the high-temperature binder,sodium carboxymethyl cellulose as the porogen,and Mn O₂ as the additive to prepare a material with higher mechanical strength and higher reaction rate.At the same time,this study also used rice husk to make a homemade biomass activated carbon to replace the purchased activated carbon,aiming to realize the recycling of agricultural waste.The research content and results are as follows:1)The Mn O₂modified micro-electrolytic material was prepared by the high-temperature roasting method,and the effects of roasting conditions and the content of each component on the properties of the material were explored.It is finally determined that the bentonite content is 20%,the Mn O₂content is 10%,the mass ratio of iron to activated carbon is 4:1,the calcination temperature is 1000?,the calcination time is 120min,and the porogen is 2g per 40g material.2)The modified micro-electrolytic material was used to treat 40mg/L rhodamine B simulated wastewater,and the treatment conditions were optimized.The final treatment conditions are as follows:the reaction temperature is 25°C,the p H value is equal to 3,the aeration rate is 3L/min,and the material dosage is 100g/L.Under these conditions,the COD removal rate was 58.6%,and the chroma removal rate was 84.5%.3)Combining the micro-electrolysis method with the Fenton method,when the H₂O₂dosage is 3m L,the COD removal rate of the solution can be further increased to 89.8%.4)Use acid-base activation method to activate rice husk biomass activated carbon.The best activation condition is that the mass ratio of KOH to biochar is 1.5:1,the activation temperature is 800?,and the activation time is 120min.5)By comparing the performance of different materials,it is found that adding an appropriate amount of Mn O₂ can effectively improve the COD removal rate of the solution,and the chroma removal rate has no obvious change.Using self-made activated carbon will reduce COD removal rate by 5%and chroma removal rate by 27%.All materials can be recycled three times or more.6)The apparent physical properties of the Mn O₂ modified micro-electrolytic material were tested and its morphology was observed.The apparent physical properties indicate that the material has higher water absorption and stronger mechanical strength,and the micro morphology indicates that the material has a larger specific surface area.