A method and equipment for treating melamine wastewater by ultrafiltration membrane

Abstract

The invention relates to a method and equipment for treating tripolycyanamide waste water by using ultrafiltration membranes and belongs to the field of waste water treatment. In the invention, waste water from tripolycyanamide production is treated by using the ultrafiltration membranes, an ultrafiltration system consists of three ultrafiltration membrane modules which are connected in series, each ultrafiltration membrane module has three sets of parallelly working ultrafiltration membrane equipment, ornithine aminotransferase (OAT) pulp enters the three ultrafiltration membrane modules in turn, and the ultrafiltration membranes divide the OAT pulp into concentrated OAT pulp, resident fluid and pure tripolycyanamide and penetrating fluid. The resident fluid enters a resident fluid tank from the third ultrafiltration membrane module and is subjected to high-temperature and high-pressure treatment; and the OAT and tripolycyanamide are decomposed into ammonia and carbon dioxide, which are recovered and reduced. The penetrating fluid is discharged from each set of ultrafiltration membrane equipment and recycled as process circulating water, and thus, the zero waste discharge of a tripolycyanamide device is realized. The production of waste slag in a tripolycyanamide production process is avoided, the process is environment-friendly, the process atom economy is high, limited resources are saved, and energy consumption and cost are reduced.

Description

technical field [0001] The invention relates to a method and equipment for treating melamine wastewater, belonging to the field of wastewater treatment, in particular to a method and equipment for treating melamine production wastewater by using an ultrafiltration membrane equipment. Background technique [0002] At present, the domestic melamine high-pressure method production equipment basically adopts the Italian ETEC technology, which adopts the co-production mode with the urea equipment. In the process of melamine production, the circulation system produces process wastewater. Because the process wastewater contains melamine and its hydrolyzed product OAT, in order to ensure the quality of the product, OAT must be removed. At present, some plate and frame filter production equipment is used to remove OAT. This method is used in the production process. A large amount of solid waste will be produced, and landfill is used for solid waste disposal, which not only wastes re...

AI Technical Summary

Problems solved by technology

In the process of melamine production, the circulation system produces process wastewater. Because the process wastewater contains melamine and its hydrolyzed product OAT, in order to ensure the quality of the product, OAT must be removed. At present, some plate and frame filter production equipment is used to remove OAT. This method is used in the production process. A large amount of solid waste will be produced, and the disposal of solid waste is landfill, which wastes resources and pollutes the environment

There is no relevant literature report on the treatment of melamine wastewater by ultrafiltration membrane

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