Method for recycling and purifying salt-leaching wastewater

Abstract

The invention discloses a method for recycling and purifying salt-leaching wastewater. The method comprises the steps that saline water after salt leaching is recycled, the recycled saline water is divided into two parts, one part of the saline water is leached through evaporation, water is evaporated into hot steam to be introduced into a fertilizer mixing box to heat a fertilizer, the other partof the saline water pressurizes a purification chamber through a high-pressure air pump in the purification chamber, so that the filtered water enters the fertilizer mixing box through an RO reverseosmosis membrane, salt and heavy metal ions in the saline water are filtered out, so that the filtered water is mixed with the fertilizer, after the air flow heating the fertilizer is extracted and enters a condensing chamber to be condensed into water flow, salt leaching is carried out on a land again, the saline water after salt leaching is purified and recycled, and a water tank does not need to be re-added to perform water and fertilizer mixing on the fertilizer.

Description

technical field [0001] The invention relates to the technical field of water purification and recovery, in particular to a method for recovery and purification of salt washing wastewater. Background technique [0002] Saline-alkali soil means that the salt contained in the soil affects the normal growth of crops. All kinds of saline-alkali soil are formed under certain natural conditions. So that the salt gradually accumulates on the soil surface in salt-collecting areas; soil salinization has seriously affected the growth of crops. At present, my country's saline-alkali land transformation mainly includes terrace field method, soil improvement method, drainage method, and salt washing method. method, chemical method, biological method, etc.; among them, fresh water is used to dissolve the salt in the soil, and the salt is drained away through the drainage system; at present, after salt washing, the drained salt water is generally discharged into the reservoir. But in the prio...

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Problems solved by technology

[0002]Saline-alkali land refers to the salt contained in the soil that affects the normal growth of crops. All kinds of saline-alkali soil are formed under certain natural conditions. The essence of its formation is The main reason is that various soluble salts are redistributed in the direction and vertical direction on the ground, so that the salt gradually accumulates on the soil surface in the salt-collecting area; soil salinization seriously affects the growth of crops. At present, my country is improving saline-alkali land There are mainly field method, soil improvement method, drainage method, salt washing method, chemical method, biological method, etc. Among them, drainage and salt washing method uses fresh water to dissolve the salt in the soil, and then drains the salt away through the drainage system; After washing the salt, the drained brine is generally discharged into the reservoir, but in the prior art, there is no research on the use of the land after washing the salt

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