Tips of MVR Technology in High-salt Wastewater Treatment

In wastewater treatment industry, mechanical vapor recompression evaporation technology (MVR for short) aims to reduce environmental impact and reduce energy consumption by recycling and reuse of secondary steam generated by evaporators. The working principle of MVR in this application is that secondary steam from evaporators is compressed to increase its temperature and pressure. The pressed steam then enters the heating chamber and functions as the heating steam. After the material absorbs the heat, the generated secondary heat will be recycled and reused again as heat source for further evaporation cycle. Thus it reduces consumption of steam in the complete evaporation system and fresh steam is only required for starting up the evaporators.

At present, MVR evaporator is widely used in various fields, including evaporation and concentration of fruit juice, corn syrup, pharmaceuticals and other processes. Myande has successfully applied MVR to achieve zero-affluent result in treating non-organic wastewater with high concentration of salt as well as organic waste water.

In recent years, development of biochemical technology and successful separation, cultivation and treatment of halotolerant and halophilic bacteria have made it possible to treat industrial wastewater containing salt by biochemical methods. However, halotolerant and halophilic bacteria have high requirements for the ambient conditions and can deal with wastewater with limited salt content. The running cost is also high. MVR evaporation technology on the other hand can not only reduce COD figure in wastewater with high salt content but also separate the soluble salts from the industrial wastewater so that the water can be recycled.

MVR Evaporation System

Tips of MVR Technology Applied to Waste Water Evaporation and Crystallization

On June 7, 2016, Myande Group Co., Ltd. and Jiangsu Youjia Plant Protection Co., Ltd. (hereinafter referred to as "Jiangsu Youjia") signed a contract by which Myande will supply Youjia with two MVR wastewater evaporation and crystallization facilities for treatment and resourcelization of wastewater generated in the process of producing alicylic acid, dicamba, and other pesticide intermediates. When installed, these two facilities will enable Youjia to recover industrial grade sodium chloride and potassium chloride from the wastewater through evaporation and crystallization processes. The wastewater after evaporation will be recycled as process water used in the production process. Major features of these evaporation facilities will include high level of automation, minimized energy consumption, and zero wastewater emission.