Method for treating reverse osmosis membrane, method for suppressing aqueous biofouling, and apparatus for suppressing aqueous biofouling
A technology of reverse osmosis membrane and treatment method, which is applied in the direction of osmosis/dialysis water/sewage treatment, reverse osmosis, semi-permeable membrane separation, etc., and can solve the problem of water piping, flow path membrane blockage, piping metal material corrosion, thermal efficiency decline, etc. question
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Embodiment 1
[0151] [Example 1: Free chlorine concentration in treated water]
[0152] The bonding state of chlorine when the oxidizing agent and the stabilizer were mixed in advance and then added to the system was theoretically evaluated.
[0153]
[0154] Prepare a sodium sulfamate solution with a concentration of sulfamic acid above 20%. Sodium hypochlorite having an available chlorine concentration of 10% or more is added thereto. Set the mixing ratio to 1 mg-Cl relative to sodium hypochlorite 2 / L solution and more than 3mg / L in terms of sulfamic acid.
[0155] Thus, a reaction solution containing a stabilizer and a chlorine-based oxidizing agent is prepared. The total residual chlorine concentration of the reaction solution containing stabilizer and chlorine-based oxidant is 100mg-Cl 2 / L above. Also, a 500 mg / L NaCl solution was used as the water to be treated.
[0156] The reaction solution prepared 5 minutes after the preparation was added to a 500 mg / L NaCl solution so t...
Embodiment 2
[0200] [Example 2: Total residual chlorine concentration of reaction solution]
[0201] In a reaction solution containing stable bonded chlorine generated by reacting a stabilizer with a chlorine-based oxidizing agent, the bonding state of chlorine when the total residual chlorine concentration is changed when the oxidizing agent is mixed with the stabilizer is theoretically Make an evaluation.
[0202]
[0203] Prepare pure water in a beaker. The temperature of the test environment was set at 25°C. A sodium sulfamate solution prepared so that the concentration of sulfamic acid would be 20% or more was added to pure water. Sodium hypochlorite having an available chlorine concentration of 10% or more was added to the aqueous solution containing sulfamic acid. The mixing ratio was set to 3 mg / L or more in terms of sulfamic acid with respect to the sodium hypochlorite 1 mg / L solution. Thus, a reaction solution containing a stabilizer and a chlorine-based oxidizing agent is ...
Embodiment 3
[0214] [embodiment 3: the use ratio of stabilizer]
[0215] The bonding state of chlorine when the mixing ratio of the oxidizing agent and the stabilizer was changed was evaluated theoretically.
[0216]
[0217] Prepare pure water in a beaker. The temperature of the test environment was set at 25°C. A sodium sulfamate solution prepared so that the concentration of sulfamic acid would be 20% or more was added to pure water. Sodium hypochlorite having an available chlorine concentration of 10% or more was added to the aqueous solution containing sulfamic acid. Thus, a reaction solution containing a stabilizer and a chlorine-based oxidizing agent is prepared.
[0218] The residual chlorine concentration after mixing the prepared reaction solution for 30 seconds was measured by the DPD method (the calculation method is the same as in Example 1). With the same residual chlorine concentration (450mg-Cl 2 / L), changing the amount of sulfamic acid to repeat this operation. Th...
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