Simulation And Optimization Design Of Ultra - Pure Water Prepared By Reverse Osmosis

Reverse osmosis technology due to having the separation, purification, concentration and other functions, as well as energy saving, design easy, simple and environmentally friendly, is widely used in water treatment, chemical, pharmaceutical, environmental protection, biotechnology, electronics and other fields. In the use of reverse osmosis membrane, there are many factors that affect the life of the membrane. In this paper, the process for pure water adopting the method of reverse osmosis using spiral-wound membrane was analyzed, the main factors of affecting the life of the membrane in the process were presented, There are three following:1.Influent quality(Mainly the impact of hardness); 2.1nfluent operating conditions (Mainly the velocity of flow); 3. Self structure of membrane module.For reverse osmosis membrane feed water quality requirements, an improved hardness line monitor for reverse osmosis was researched and developed. The hardness tester national standard hardness measurement method for the titration principle, the color RGB color sensor value acquisition is converted to HSB values, enhancing the accuracy of the titration end point is determined; the hardness tester also has a wide measurement range, high accuracy. Using the hardness line monitor, explore the impact of water hardness on membrane life. For the problems in ultra-pure water manufacturing process, such as the life of the membrane, etc, the ultra-pure water preparation process constitute factors were explored, operating conditions and other spiral wound membrane module for the life of the membrane by CFD analog binding assay method. According to the general principle of extractants selections, some new researches and experiments were carried out, which turned out that efficiency and prolong the production cycle were increased.The two-dimensional structure diagram of spiral wound membrane modules was simulated by CFD, showing the changes of flow field and concentration field in membrane modules. Flow Field Simulation results show that:For non-retina barrier, inlet velocity increases, wall shear stress and the pressure drop within the membrane channels were increased, In the case of the same inlet velocity, the flow path paved with flow boundary layer thickness is significantly less than Netted Netted no flow boundary case floor, separated net flow channel increases the mass transfer effect, effectively reducing membrane fouling and concentration polarization; Vortex separator is formed around the network more obvious, "dead zone", the smaller, the greater the degree of mixing of the components of the solution to form a concentration polarization trend of smaller, the degree of membrane fouling is correspondingly reduced.The process of water prepared by reverse osmosis is designed in this article, including water pre-treatment, reverse osmosis water technology I, reverse osmosis water â…¡, process water after treatment, and the no-netted roll membrane running results were tested. Through the long-time running, when the running time is over 80 hours and the electrical conductivity of pure water produced is more than 5 us/cm, then you can think membrane performance is a failure. Finally, each of the membrane module inlet and configuration parameters were optimized. Through comprehensive analysis and comparison, when the inlet velocity is 0.7 m/s and membrane separator assembly is circular, the effective lifespan of membrane module is the longest, consisting with the simulation results.