In-situ processing method of alkaline land washing water

Abstract

The invention discloses an in-situ processing method of alkaline land washing water. The method comprises the following steps: (1) the alkaline land washing water flows through a wet land with a salt absorption filtering function, wherein the wet land is sequentially divided into the following areas according to the washing water flow direction: a washing water buffer regulation area, a physical filtering area, a wet land planting area, a secondary physical adsorption filtering area and a washing water outlet buffer area; and (2) the washing water processed in the step (1) flows through an alkali discharge channel additionally provided with an adsorption bed. The method processes the alkaline land washing water by use of the alkali discharge channel and alkali discharge pool, has low cost and avoids environmental pollution; the processed washing water can be reused, and the processed adsorption material can be used as a building material to prepare coatings, building thermal insulation materials and the like; and the method not only improves performance, but also realizes cyclic use of resources.

Description

technical field [0001] The invention relates to a treatment method for saline-alkali washing water, in particular to a saline-alkali washing water that utilizes alkali-discharging canals and alkali-discharging ponds to realize in-situ treatment during the discharge and collection of saline-alkali washing water, saving investment and operating costs Approach. Background technique [0002] At present, the treatment methods of saline-alkali washing water at home and abroad mainly include the following types: [0003] (1) Lime-soda ash softening method: It can effectively remove the main components in water such as calcium, magnesium, phosphate and silicon dioxide, etc., and remove suspended solids, corrosion products and microbial slime in the process of precipitation and filtration. However, the sludge generated is easy to dehydrate; [0004] (2) Chemical desalination (ion exchange method): It requires a large amount of industrial raw materials such as ion exchange resin and...

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Problems solved by technology

[0003] (1) Lime-soda ash softening method: It can effectively remove the main components in water such as calcium, magnesium, phosphate and silicon dioxide, etc., and remove suspended solids, corrosion products and microbial slime in the process of precipitation and filtration. However, the sludge generated is easy to dehydrate;

[0004] (2) Chemical desalination (ion exchange method): It requires a large amount of industrial raw materials such as ion exchange resin and acid and alkali for regeneration, so not only the operating cost is high, but also the discharge of acid and alkali waste liquid will cause pollution;

[0005] (3) Membrane separation technology desalination (electrodialysis and reverse osmosis): the requirements for membrane and influent water quality are very high, and operation and maintenance are more troublesome;

[0006] (4) Thermal desalination (distillation method): including multi-effect evaporation, multi-stage flash evaporation, compressed air distillation, and membrane distillation, but the energy consumption is high, the cost of water production is quite high, and it cannot meet a large amount of industrial production water, and it is difficult to realize industrialization

This kind of irrigation and drainage engineering technology objectively has the following problems: ① Salt washing and drainage consume too much water resources, generally 4500-7500m 3 / hm 2 Large irrigation quota, high irrigation water consumption, most of the saline-alkali lands appear in arid and semi-arid areas, and fresh water resources are very precious; ②The amount of land washing and drainage projects is large, and the investment in drainage projects is high, generally 0.9-12,000 yuan / hm 2 , uneconomical, and the construction of irrigation and drainage projects is cumbersome; ③After washing the ground, the wastewater is directly discharged into the ecosystem without any treatment, which destroys the balance of the water system

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