Method for treating wastewater in production of p-nitrobenzoic acid

Abstract

The invention discloses a method for treating wastewater in production of p-nitrobenzoic acid, and belongs to the technical field of wastewater treatment. The method comprises the following steps of (1) resin adsorption: leading the wastewater into a container loaded with adsorption resin to perform resin adsorption, so as to obtain an adsorption solution; (2) low-temperature concentration: leading the adsorption solution into concentration equipment, and concentrating at the temperature of 70 to 95 DEG C, so as to obtain a nitric acid recycling solution and a condensing solution; (3) resin regeneration: leading a regeneration agent into the container containing the resin after adsorption in step (1) to regenerate, so as to obtain a regeneration solution; rectifying the regeneration solution, so as to obtain a rectification component and a tower bottom solution. The treatment method has the advantages that the byproducts can be recycled, or be drained after reaching the standards; theresource utilization of the byproducts is furthest completed; the zero-emission effect is realized; the wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a treatment method for p-nitrobenzoic acid production waste water. Background technique [0002] The waste water produced in the p-nitrobenzoic acid production process mainly contains organic matter such as p-nitrobenzoic acid and p-nitrotoluene, and also contains a certain concentration of nitric acid. The methods commonly used to treat this type of waste water in the prior art are as follows : [0003] Evaporation + biochemical method, the problem is that evaporation is easy to produce tar, the equipment stability is poor, the problem of biochemical total nitrogen is difficult to solve, and biochemical covers a large area; the problem of advanced oxidation + evaporation method is that the advanced oxidation equipment requires high requirements and high operating costs , the fluctuation of different batches of wastewater has a greater impact on the treatment effec...

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Problems solved by technology

[0003] Evaporation + biochemical method, the problem is that evaporation is easy to produce tar, the equipment stability is poor, the problem of biochemical total nitrogen is difficult to solve, and biochemical covers a large area; the problem of advanced oxidation + evaporation method is that the advanced oxidation equipment requires high requirements and high operating costs , the fluctuation of different batches of wastewater has a greater impact on the treatment effect; the problem with the incineration method is that it can be directly incinerated or concentrated and then incinerated, and the flue gas must be treated

The cost of incineration to treat this kind of wastewater is generally around 1,000 yuan per ton of water, which is unaffordable for ordinary enterprises

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