Reverse-flow PRMD-PRO system and method based on waste heat recovery and desalination

Abstract

The invention discloses a reverse-flow PRMD-PRO system and method based on waste heat recovery and desalination. The PRMD-PRO system comprises two processes, namely a pressure delay membrane distillation process and a pressure delay permeation process. The pressure delay membrane distillation process and the pressure delay permeation process are used together; high-temperature and high-salt industrial wastewater (COD=2000-6000 mg / L, pH=6-9 and T=30-80 DEG C) is used as a raw material solution, low-quality heat energy in the raw material solution is extracted through a pressure delay membrane distillation process, and salinity gradient energy in the raw material solution is extracted through a pressure delay permeation process. And finally, the energy grade is improved, the energy is converted into electric energy, the recycling rate of secondary energy is increased, and meanwhile pollution to the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of secondary energy utilization and water treatment, and relates to a method for recovering low-quality heat energy in industrial wastewater by using membrane technology, in particular to a countercurrent PRMD-PRO system and method based on waste heat recovery and desalination. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Since the reform and opening up, China's industry has developed rapidly, becoming a "world manufacturing center". As the foundation of industrial modernization, the iron and steel industry is one of the pillar industries of our country, but it is also a "big water consumer" and "big p...

AI Technical Summary

Problems solved by technology

As the most commonly used cooling medium, water runs through the entire production process, and eventually collects a large amount of harmful and toxic substances. These waste water cannot be directly used. If they are directly discharged, they will continue to accumulate in the ecological environment, causing damage to the environment and threatening human beings. Survive

However, at present, there is a lack of advanced treatment technology for industrial wastewater in China, and the reuse rate of reclaimed water is low.

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