Research On Technology Of Removing Chlorine From Wastewater Containing High Concentration Of Chlorine

Water is the natural resource which is irreplacement in human's manufacture and living process, it is the source of human's life. But now water resource crisis has become a problem constrainted development of economic after the oil crisis and power crisis. In order to China's sustainable development, solution to the problem of water resource is very urgent and imperative. With the wastewater reuse technology has been put on the agenda, all kinds of reuse technology advanced rapidly, the membrane technology is one strong force in reuse technology, because of its high separation efficiency, simple operation, applicable to a wide range, membrane technology has been developed rapidly, while reverse osmosis membrane technology has obtained good results in seawater desalination, brackish water desalination, kinds of industrial wastewater treatment and reuse, urban water supply treatment.Shortage of Water resource and the situation of water pollution all over the world have been described in this paper, also proposed the concept and current situation of industrial wastewater reuse, and the main purpose of this project was to treat the wastewater containing high concentration of chlorine and made the concentration of chlorine achieved the require for reusing. In this paper, the development situation, principle and characteristics of membrane technology have been overviewed, several common membrane technology and applications have been listed, and the membrane fouling which was inevitable phenomenon in the wastewater treatment process by membrane technology and fouled membrane cleaning methods have been described briefly, emphasised the principle, classification, performance parameters, impact factors of reverse osmosis membrane separation technology and industrial areas that large-scale applicated of reverse osmosis membrane separation technology currently.In the Experimental section, variety of pretreatment methods, devices affiliated to reverse osmosis system, concept and calculation of parameters in the experiment have been introduced, the pretreatment method to the wastewater containing high concentration of chlorine of a chemical plant in Kunming determined was filtered by the filter paper and 0.45μm filter membrane orderly. Reverse osmosis membrane separation part focused on the impact of the chloride ion concentration at 1000-4000mg·L-1, operating pressure at 1.0～1.6MPa, temperature at 25～40℃, pH at 5.5-8.5 to water recovery, removal rate of chlorine and permeate flux. The results showed: water recovery decreased with the feed concentration increased, with the pressure and temperature increased, water recovery increased too; the removal rate of chloride ion decreased with the feed concentration and temperature increased, increased as the feed pressure; with the feed concentration increased, permeate flux decreased, but increased with the feed pressure and temperature; the impacts of pH to water recovery, the removal rate of chlorine and permeate flux are not large. No matter what the feed conditions were, the removal rate of chloride ion have reached more than 98.0%, the concentration of chlorine ion in the clean water could be reduced to less than 100mg·L-1, especially when the feed concentration was 1000 mg·L-1, the pressure was 1.6MPa, temperature was 30℃, pH was 6.5, the removal rate of chloride ion dropped to the minimum 12.57 mg·L-1.Finally according to the experimental data calculated the model of permeate flux and the electric charge model of running the reverse osmosis membrane device on the basis of the model of permeate flux:Model of permeate flux: Jw=P0.3706R1.8086Electric charge model of running the reverse osmosis device: f=(?)The experimental data under all of the running conditions were analysised by the electric charge model of running the reverse osmosis model, the results were:the electric charge of running reverse osmosis device were the least at the condition of pressure 1.0MPa, temperature 40℃and the feed concentration at 1000mg·L-1, and the quality of wastewater after treated could meet the standard for reuse, so the reverse osmosis system were economic optimum under this operating conditions.