Method and system for recycling non-clean water source by utilizing osmotic energy

Abstract

The invention provides a method and a system for recycling a non-clean water source by utilizing osmotic energy. The method comprises the steps of enabling a raw material solution to circulate to one side of a semi-permeable membrane assembly through a pump, wherein the raw material solution is the non-clean water source which is generated in industry, municipal and life processes and cannot be directly utilized; enabling a resolvable driving substance in the form of a driving solution to circulate to the other side of the semi-permeable membrane assembly through the pump, unidirectionally diffusing water in the raw material solution to the driving solution though the semi-permeable membrane assembly so as to dilute the driving solution and realize the concentration of the raw material solution; enabling the diluted driving solution to return back to a solution storage pool, enabling the driving solution to return to a saturated state or improving the concentration, restoring the driving effect, repeating the processes of circulation, one-way penetration and driving restoring. The method and the system provided by the invention have the advantages that the condensation process of the non-clean water source and the dissolution process of the driving solute are simultaneously realized, the consumption of the uncontaminated water source is reduced, the industry energy consumption is reduced, and thus the production cost is reduced, and the economic benefits are improved.

Description

technical field [0001] The invention relates to the technical field of separation, in particular to a method and a system for utilizing osmotic energy to reuse unclean water sources. Background technique [0002] A very common and largely overlooked source of energy in industrial processes is the chemical energy of salt dissolution, or osmotic energy. The dissolution process of salt is a diffusion process, and it is usually an exothermic process, that is, the osmotic energy is released in the form of heat. How to use osmotic energy directly instead of dissipating it in the form of heat is an industrial problem. For example, in the typical chlor-alkali industry in the inorganic chemical industry, a large amount of sodium chloride is dissolved, and 1 ton of solid salt needs about 3 tons of water to dissolve before reaching the required salt concentration. Dissolving sodium chloride is also a very common process in the soda ash industry. For example, some soda ash plants need...

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Problems solved by technology

[0004] For sewage treatment, the current common solution in the industry is: first, carry out complex treatment of sewage to meet the discharge standard or reuse standard; the discharge standard is relatively simple, but it requires reuse, and often requires desalination treatment, such as reverse osmosis Or nanofiltration; in many cases, the cost of treatment is very high when the pollutants are complicated

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