Study On The Technology Of Combined Process Of Chemical Oxidation And Ultrafiltration Of Fe And Mn Contained In Groundwater

Groundwater resource plays a significant role in the water. It is widely used in our life and society production as a reliable source of water. In this paper, we explored a new combination process to remove Fe and Mn in the groundwater economically and effectively. In this study, natural oxidation- combination ultrafiltration process, combination reagent oxidation- ultrafiltration process and contact oxidation-combination ultrafiltration process are applied.The analysis of natural oxidation- ultrafiltration experiment in condition of different pH shows that, the Fe in water is able to meet the national drinking water standard in 10 minutes. Furthermore, the less Fe remains in the water as the pH value gets bigger. The effect of Fe removal is mainly rely on natural oxidation of Fe, through the air and increase the pH value. At the same time, the ultrafiltration technology has the ability of high precision separation, which makes the water quality stabile, can meet the "drinking water health standards"(GB5749-2006)(Fe acuities were 0.3 mg/L). And its technological level and the main technical and economic indicators are better than sand filtration process.We applied a series of the combination reagent oxidation- ultrafiltration process experiments, analyzed the Fe removal effect of combination of the sodium hypochlorite oxidation- ultrafiltration process and potassium permanganate oxidation- ultrafiltration process. The results confirm that, after sodium hypochlorite oxidation or potassium permanganate oxidation of water by ultrafiltration system, Fe removal average rate is over 99%, water iron content is almost zero. The treatment effect is improved obviously. Which can achieve the goal of safety and health of water supply. In the operation of the actual water works, potassium permanganate may cause a "red water" phenomenon, affecting the waterworks water supply water quality, and the experiments using ultrafiltration technology is better than sand filtration process precision separation ability, which can solve the problem, guarantee the stability of water quality, meet the standard requirements.The contact oxidation-ultrafiltration process experiments imply that, the treatment of the test groundwater has obtained a good effect. The Fe content in the first stage is about 0.02 ~ 0.03 mg/L, the removal rate of Fe is between 68 ~ 80%, Fe content is below 0.05 mg/L, removal rate of Mn is 90 ~ 96%. In the second stage, contact oxidation pretreatment is mainly responsible for removing Fe and Mn. Ultrafiltration treatment can further remove the Fe and Mn in the water, remaining Fe content is about 0.02 ~ 0.03 mg/L, the removal rate is 85 ~ 95%, the residual Mn content below about 0.05 mg/L, removal rate in 93 ~ 99%. As soon as the Fe and Mn added in the raw water, the 24 h in the process, the water changes during 24 hours. During this time, Fe and Mn in water of each time point can achieve very low levels, the water remained stable. Through analyzing the water through the membrane, using 0.01 microns of ultrafiltration membrane membrane results are better than 0.45 microns. This also confirmed in the contact oxidation process, ultrafiltration has the ability of high precision separation, treated water can be further processed.