Double-membrane seawater desalination process

Abstract

A double-membrane seawater desalination process specifically comprises the following steps: (1) taking shells aged for two years; (2) crushing the shells into particles; (3) adding the crushed shellsinto a packed tower; (4) fully mixing raw water and carbon dioxide in a mixer; (5) adding a carbon dioxide aqueous solution generated in the step (4) into the packed tower; (6) adding the water produced in the packed tower in the step (5) into a filter through a water pipeline; (7) adding the water filtered in the step (6) into an ultraviolet sterilization device; and (8) putting the product waterin the step (7) directly into a drinking water storage tank for backup. The method has the beneficial effects that the hardness and mineral content of the produced water can be improved, the production efficiency is improved, the cost is saved, the produced water meets the requirements of drinking water, and the precipitation content of the trace element strontium reaches the standard of drinkingnatural mineral water.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a double-membrane seawater desalination process. Background technique [0002] In the double-membrane seawater desalination method, the water produced after the reverse osmosis desalination process has low mineral content. Drinking it for a long time will have adverse effects on the body, and the reverse osmosis produced water will corrode the water pipeline and cause red water phenomenon. Therefore, the reverse osmosis produced water needs to increase the mineralization process, increase the mineral content and alkalinity, so that the produced water meets the drinking water standard and is not corrosive. The existing mineralization method is mainly acid leaching mineral method. The acid leaching mineral method uses carbonic acid to dissolve limestone or other minerals. After the gas-liquid mixture dissolves carbon dioxide in water, the carbonic acid so...

AI Technical Summary

Problems solved by technology

The existing process implements the treatment process of carbon dioxide acidified shells, but the shells that have been aged for many years are used. The output of such shells is small and difficult to mine and utilize. The long-term operation of the equipment will lead to insufficient supply of fillers.

If new shells or shells with a short aging time are used, the turbidity of the treated product water will increase, and the number of bacterial colonies will also increase, which will affect the quality of the product water.