| A study, wastewater reuse techniques using membrane seperation system are discussed. CMF(Continuous Micro Filtration) and R/O(Reverse Osmosis) pilot test were conducted to study if the reusing wastewater is used as ultra pure water in two sites. One site is Posco HU¨ls in Chonan(below A plant) and the other site is samsung in Onyang(below B plant). The results are as follows. 1) CMF has proven effective in Turbidity, TDS, Color, SS, T-Fe, and SDI removal, and also suitable as pre-treatment faccility of R/O system in both plants. 2) The removal rate of organic metter and Nutrient in R/O treated water presented 79.08% and 85.57% respectively. This results are guaranteed condition of R/O treated water in A plant. 3) In A plant, nitrate was not removed in CMF, but was removed 94.35% in R/O. 4) In B plant, the raw water containing almost particle size below 0.2㎛ was pretreated by coagulation and than treated by CMF, the removal rate of turbidity and SS presented 100%. 5) In plant the concentration of conductivity, TDS, and Cl^- was higher treated water than raw water. It is considered that innoculate chemical in CMF influent. But because this water quality is guaranteed for R/O influent, not influenced on R/O life and select of design. 6) As seen this pilot test, CMF and R/O system can be producted ultra pure water and also save more construction area and running cost than those of conventional type if raw water was pretreated appropriately. |
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