Method for recycling viscose fiber acidic wastewater by using two-stage special membrane

Abstract

The invention discloses a method for recycling viscose fiber acidic wastewater by using a two-stage special membrane, belonging to the technical field of recycling of acidic wastewater. The method ischaracterized by comprising the steps of treating raw water of viscose fiber acidic wastewater by using a pretreatment system; treating the water produced by pretreatment by means of a first stage special reverse osmosis membrane system so as to intercept part of sulfate radicals in the water, and improving the pH value of the water produced by the first stage special reverse osmosis membrane system at the same time; adjusting the pH value of the water produced by the first stage special reverse osmosis membrane system to 7-8.5, and then treating the water by using a secondary common reverse osmosis membrane system; enabling the water produced by the secondary common reverse osmosis membrane system to reach the desalination standard, and directly sending the water to a process workshop forrecycling. The method provided by the invention effectively solves the problem of water resource waste caused by the direct sewage treatment up-to-standard discharge in the prior art, reduces the sewage treatment and discharge costs; furthermore, the method also solves the problem that in the prior art, the pH of the acidic wastewater is adjusted to be neutral by using caustic soda directly, so that a large amount of alkali liquid is consumed, and the recycling cost is accordingly too high.

Description

Technical field [0001] The invention belongs to the technical field of acid waste water recycling and reuse, and specifically relates to a method for recycling and reusing viscose fiber acid waste water by adopting a two-stage special membrane. Background technique [0002] Currently, there is no advanced technology to be found in the treatment of acidic wastewater in the viscose fiber industry. Acidic wastewater is generally divided into two solutions according to the situation. One is to directly pass the sewage treatment process and discharged after reaching the standard; the other is to adjust the pH of the acidic wastewater to neutral (6-9) with caustic soda, after pretreatment and general reverse osmosis system Reuse after treatment. Such as figure 1 Shown is a general reverse osmosis water treatment system process flow chart, which can be divided into two parts: raw water pretreatment system and reverse osmosis treatment system. [0003] The disadvantage of the above metho...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a method for recycling and reusing viscose fiber acidic waste water by adopting two-stage special membranes. Waste problem, reduce sewage treatment and discharge costs; at the same time solve the problem in the prior art method 2 that directly uses caustic soda to adjust the pH of acidic wastewater to neutral, and consumes a large amount of lye to cause excessive recovery costs

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