Urea production waste liquid treatment device and treatment method

Abstract

The invention belongs to a urea production waste liquid treatment device and a treatment method. Comprising a conversion condensate collection pool and a urea desorption waste liquid collection pool, the conversion condensate collection pool is connected with an inlet of a desalted water station water tank through an ammonia nitrogen removal unit and a forward osmosis unit, a desalted water inlet of the desalted water station water tank is connected with a desalted water purification station, and an outlet of the desalted water station water tank is connected with an inlet of a reverse osmosis device. The water producing side of the reverse osmosis device is connected with the desalted water producing tank; the method has the advantages of environmental protection, energy conservation, wide application range, wastewater recycling, sewage reduction, reduction of wastewater treatment cost and improvement of water resource utilization rate.

Description

technical field [0001] The invention belongs to the technical field of waste liquid treatment generated during urea production, and in particular relates to a urea production waste liquid treatment device and treatment method based on a forward osmosis membrane and a hydrophobic porous membrane. Background technique [0002] In the process of urea production, steam condensate with high COD and high ammonia nitrogen will be produced in the transformation section, which is called transformation condensate. Usually, the COD content of the transformation condensate is 5000-20000mg / L, the ammonia nitrogen content is 10000-20000mg / L, containing The salt content is 20-150mg / L; the urea section will produce a process condensate containing a small amount of ammonia nitrogen, which is called urea desorption waste liquid. Usually, the COD content of urea desorption waste liquid is 10-60mg / L, and the ammonia nitrogen content is 3-50mg / L. L, with a salt content of 1–10 mg / L. The common f...

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Problems solved by technology

Direct discharge causes waste of water resources. At the same time, high salt will pollute the environment, and because of the high content of COD and ammonia nitrogen, it generally does not meet the conditions for direct discharge; sending reclaimed water to a reuse device requires high treatment costs, per ton of water The treatment cost is generally 4-10 yuan, and it is directly made into crystalline salt, and the treatment cost per ton of water is higher, 20-50 yuan; the sewage treatment plant in the park not only has to pay the sewage treatment fee, but also causes waste of water resources, increasing the cost of the park. Burden of sewage treatment

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