Mechanical Vapor Recompression (MVR) evaporation presents is an efficient energy-saving and environmental protection technology that reduces consumption of external energy by recycling and reusing secondary steam energy generated within the evaporator. The principle of MVR technology is that secondary steam is compressed to increase its pressure and temperature and then is used as the heating source of the evaporation system. The material being evaporated absorbs heat and continues to release secondary steam which is again compressed and recycled so that the complete evaporation system requires minimized amount of fresh steam only as starting heat source. This article mainly introduces the advantages of MVR evaporation technology and its application in the field of high-salt industrial wastewater treatment.
1. Traditional multi-effect evaporation VS MVR evaporation
For multi-effect evaporation, the more effects there are, the higher its evaporation efficiency. Compared with multi-effect evaporation, MVR evaporation has obvious advantage in terms of energy saving, especially when the capacity per hour is large. Thus, MVR evaporation brings more economic and energy-saving benefits to enterprises and is of great significance to the effective utilization of resources and environmental protection.
The MVR evaporators are widely used in various fields and can be used in the zero-discharge solutions of high salt inorganic and organic wastewater.
In recent years, with the development of biochemical technology, the successful separation, cultivation and domestication of halotolerant and halophilic bacteria have made it possible to adopt biochemical methods to treat high-salt industrial wastewater. However, since halotolerant and halophilic bacteria can only deal with a limited range of salt content and are costly and difficult to cultivate, large amount of high-salt industrial wastewater remains a tough problem.
MVR evaporation technology can treat all types of high-salt industrial wastewater and achieves the goal of separation of soluble salt substances in high-salt industrial wastewater and effectively reducing COD value of condensate water and reuse water resources repeatedly. The main process is as follows: