Seawater desalination device and method based on pressure-delayed osmosis and reverse osmosis

Abstract

The invention discloses a sea water desalination device based on pressure retardation osmosis and reverse osmosis and a method thereof. The sea water desalination device comprises a concentration difference power unit, a sea water desalination unit and a pressure transfer element positioned between the concentration difference power unit and the sea water desalination unit. The concentration difference power unit comprises a hollow seal water chamber No. 1, a hollow concentrated seawater chamber adjacent to the hollow seal water chamber No. 1, and an osmotic membrane positioned between the hollow seal water chamber No. 1 and the hollow concentrated seawater chamber, and the concentration difference power unit is used for converting salinity gradient power of sea water with different concentrations into static pressure. The sea water desalination unit comprises a hollow seal water chamber No. 2, a hollow fresh water chamber adjacent to the hollow seal water chamber No. 2, and a reverse osmosis membrane positioned between the hollow seal water chamber No. 2 and the hollow fresh water chamber, and under the effect of static pressure, the reverse osmosis membrane only allows water molecules to pass through, thereby achieving sea water desalination. The pressure transfer element can move or deform, and transfers static pressure to the seal water chamber No.2 through self moving or deforming. The device has a compact structure, only uses seawater salinity gradient energy for sea water desalination, does not consume high-grade energy and is green and environmental-friendly.

Description

technical field

[0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a seawater desalination device based on pressure-delayed osmosis and reverse osmosis utilizing salinity difference energy and a method thereof. Background technique

[0002] At present, a large number of offshore islands and rocky reefs are scarce in fresh water resources, and there is an urgent need to use seawater desalination technology to prepare fresh water. Traditional seawater desalination technologies mainly include: seawater freezing method, electrodialysis method, distillation method, and reverse osmosis membrane method. Among them, the distillation method and the reverse osmosis membrane method are the main desalination methods, both of which rely on electric energy. The coal, oil and natural gas resources traditionally used for power generation are facing exhaustion, and electric energy cannot be transmitted to remote islands. Therefore, seawa...

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