Energy reclaimable reverse osmosis process and energy reclaiming device thereof

Abstract

The invention discloses an energy reclaimable reverse osmosis process and an energy reclaiming device thereof, and belongs to the field of environment-friendly water treatment. In the process, a concentrated water high-pressure circulation loop and a concentrated water low-pressure circulation loop are provided based on a common reverse osmosis process, wherein the high-pressure circulation loop is used for reclaiming the concentrated water and the energy thereof; and when the salt content of the concentrated water in the high-pressure circulation loop reaches a limit capable of being borne by a reverse osmosis membrane, the concentrated water is discharged. The energy reclaiming device for the process mainly comprises a first pressure container (9), a second pressure container (20), eight electromagnetic valves and a circulating pump (6). The first pressure container (9) and the second pressure container (20) run alternately; and when the first pressure container (9) is connected to the high-pressure circulation loop, the second pressure container (20) enters the low-pressure circulation loop to flush the concentrated water and store the new concentrated water to be circulated, so the two pressure containers work alternately. The process of the invention saves a large amount of energy consumption in the water treatment process, and can produce great economic benefit.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment, and in particular relates to an energy recovery type reverse osmosis process and an energy recovery device thereof. Background technique [0002] The reverse osmosis system is the main process for desalinated water treatment today. It uses a high-pressure pump to pressurize the raw water to overcome the osmotic pressure of the solution. 2 O molecules can pass through the reverse osmosis membrane, while impurities such as inorganic salts, heavy metal ions, organic matter, colloids, bacteria, and viruses in raw water cannot pass through the reverse osmosis membrane and are trapped outside the membrane, thus making the permeable pure water and impermeable The concentrated water is strictly separated, and the reverse osmosis system is widely used because of its high filtration accuracy and wide range of water quality. [0003] The design and manufacture of reverse osmosis syst...

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Problems solved by technology

[0003] The design and manufacture of reverse osmosis systems mainly face two difficulties, namely high operating energy consumption and a large proportion of concentrated water. The above problems directly lead to the high cost per ton of water of the reverse osmosis system. To overcome the osmotic pressure of the solution so that the solute passes through the reverse osmosis membrane from the side with a lower concentration to the side with a higher concentration. Dow FILMTEC TM Series BW30-400 reverse osmosis membrane as an example, its maximum operating pressure is 41bar, the maximum pressure drop is only 1.0bar, 97.5% of the energy input by the water pump is taken away by the concentrated water, and the energy consumed by the entire system to overcome the osmotic pressure of the solution Only 2.5% of total energy

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