Fenton Wastewater Treatment Sludge Disposal And Recovery Of Iron Salts Using Technology

With the continuous improvement of environmental protection requirements and wastewater discharge standards,the current wastewater treatment technology is difficult to meet the requirements of the removal of pollutants.Fenton oxidation technology has a strong effect on the toxic and harmful,difficult to degrade contaminants in water It is widely used in the deep processing of papermaking wastewater due to the advantages of simple equipment applied,low processing cost and secondary pollution.However,the treated Fenton sludge is hazardous to industrial waste and,if disposed improperly,it can cause severe secondary contamination.In this paper,papermaking Fenton sludge was used as the research object,and its detailed composition and physicochemical properties were analyzed.The ferrous sulfate was prepared by acid leaching and iron scrap reduction method,and its application in the advanced treatment of papermaking wastewater was discussed.And the preparation of polyferric sulfate with ferrous sulfate was used to discuss the feasibility of treating anaerobic effluent.XRF and atomic absorption spectrometry,SEM and other methods were conducted to characterize Fenton iron slab.The results showed that the content of iron ions in Fenton iron mud was 35.56%,the content of organic matter was 24.50%,the surface morphology was of loose and amorphous structure,which was suitable for extracting acid ions by acid leaching method.The optimum reaction conditions were as follows: the concentration of H2SO4 was 25%,the reaction time was 60 mins,and the reaction temperature was kept between 55-65?.As the direct acid extract in the color and the color is difficult to deal with,so the treatment set at 400? after acid;acid in 40? with iron as a reducing agent to restore it,after sulfuric acid evaporated.The quality of ferrous metals is compeletly corresponded with the national standard(GB/T 664-2011)chemical pure standard.Secondly,the self-made ferrous sulfate solution was used for the deep oxidation treatment of waste water Fenton,and the process conditions of self-paper anaerobic effluent and Fenton water were discussed respectively.The optimum conditions for the treatment of anaerobic effluent were as follows: temperature 40?,reaction pH=3,H2O2 addition 25ml/L,FeSO4 addition 20ml/L,reaction time 80 min,COD removal rate was 77.91%,Wastewater color is almost 0.The optimum treatment conditions were as follows: the temperature was 40?,the reaction pH was about 4,the addition amount of H2O2 was 3ml/L,the addition amount of FeSO4 was 2ml/L,the reaction time was 80 min,and the COD removal rate was 84.6%,the waste water color was almost empty.In addition,the optimum process of preparing ferric sulfate(PFS)was as follows: the amount of acid leachate was 30 ml,the amount of self-made ferrous sulfate was 50mg(Fe2+)= 1.05,the reaction rate of 60? when the synthesis of PFS in line with GB/T14591-2006 requirements,the amount of sulfuric acid added [SO42-]/[Fe2+] =1.1:1,sodium chlorate added n(NaClO3): n(Fe2+)= 1.05.The results show that PFS is a large solid particle composed of a series of flakes,which is a polymer composed of hydroxyl groups and has little crystallinity.PFS Precipitation is mainly composed of potassium and potassium tartarum,which is a polymer composed of hydroxyl groups.The main particle size distribution is within 100 um,and the internal structure is cubic.The optimum process of self-made PFS was applied to the anaerobic effluent.It was found that when the p H was 7,the dosage of PFS was 3.5ml/L,the dosage of PAM was 15ml/L,the reaction rate was 50-60?,the COD removal rate was 75%,Chroma removal rate was about 97%.