Method for preparing sodium hypochlorite by using reverse osmosis concentrated water
A technology of reverse osmosis concentrated water and sodium hypochlorite, which is applied in the directions of hypochlorous acid, hypochlorite, chemical instruments and methods, etc., can solve the problems of large equipment volume, instability and high cost, so as to improve electrolysis efficiency and slow down scaling. , the effect of improving productivity
Pending Publication Date: 2022-03-01
临涣水务股份有限公司
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Problems solved by technology
The safety factor of liquid chlorine disinfection is low, and liquid chlorine is a dangerous product, and the transportation cost is high; chlorine dioxide has a high cost and is extremely unstable, and the residual chlorine in the pipe network decays quickly, which is easy to make the microorganisms at the end of the pipe network exceed the standard; the finished sodium hypochlorite available chlorine The conversion cost is second only to chlorine dioxide; chlorine ammonia disinfection takes a long time; bleaching powder disinfection requires a large equipment volume and high cost
Method used
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Embodiment 1
[0035] The reverse osmosis concentrated water of the water intake plant is softened by the softener, and a salt adding tank is equipped to make the chloride ion concentration 2000-4000mg / L. Pass the water sample into the electrolytic cell, the material of the electrode is a titanium-based ruthenium-based noble metal mixed oxide coated electrode plate, and the aeration is 0.5-1.5 L / min. Three electrolytic cells are connected in series, the current density is 5-10A / dm 2 , the supernatant was removed after the electrolytic solution was precipitated for 1 day, and the electrolytic cell and plate were washed with dilute nitric acid solution to measure the hardness of the nitric acid solution after cleaning. Aeration is carried out while electrolysis, the gas generated by the cathode is blown out, and then passed into the collection pool of 18% sodium hydroxide. Repeat the above steps, change the influencing factors, and measure 19 groups of valid data.
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The invention discloses a method for preparing sodium hypochlorite by using reverse osmosis concentrated water, which comprises the following steps: S1, the reverse osmosis concentrated water enters a softener for softening treatment and then enters a carbon adsorption device, the softened water subjected to carbon adsorption treatment enters a water storage tank, and the water storage tank pumps the softened water into an electrolytic bath for electrolysis to prepare sodium hypochlorite; s2, when the reverse osmosis concentrated water is electrolyzed in the electrolytic tank, an aeration device is used for carrying out bottom aeration treatment on the solution, aerated gas and gas generated by electrolysis enter a chlorine gas collecting system together, sodium hypochlorite generated by the chlorine gas collecting system and the electrolytic tank is guided into a sodium hypochlorite storage tank to be stored, and gas generated by the chlorine gas collecting system is discharged. The reverse osmosis concentrated water is used as an electrolysis raw material, so that the problem of water plant concentrated water treatment is effectively solved, and sodium hypochlorite can be produced as a disinfectant for each process of a water plant for later use.
Description
technical field [0001] The invention relates to a method for preparing sodium hypochlorite by using reverse osmosis concentrated water, and belongs to the technical field of sodium hypochlorite production. Background technique [0002] The pure water production process of pure water enterprises is similar, and its basic treatment process is generally coagulation, sedimentation, filtration, ultrafiltration, reverse osmosis, etc. The industrial concentrated water produced by reverse osmosis treatment has a large amount of water, poor biodegradability, and high salt content. features. This part of water is generally treated by reflux, distillation and concentration, and reuse as production water. Although the reflux improves the utilization rate of water, the reflux of the concentrated water increases the salt content of the raw water, which increases the osmotic pressure, which in turn reduces the reverse osmosis power and water production, and affects the service life of the...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C25B1/26C25B1/14C25B1/50C25B9/70C25B15/08C25B15/00C01B11/06
CPCC25B1/26C25B1/14C25B1/50C25B9/70C25B15/085C25B15/00C01B11/062
Inventor 孟浩赵世全张林吴书龙张良
Owner 临涣水务股份有限公司