The discharge of industrial wastewater has been a difficult problem for various enterprises. Aiming to solve this problem

we designed and developed a set of concentrated wastewater treatment devices. These devices are based on low-temperature evaporation technology

in which a heat pump is used as the driving energy source

and air is the circulation medium. We carried out a concentration experiment of a copper-tube waste washing liquid with water content of 95% using this device. The main components of the device are presented in this paper

a heat and mass transfer model of the packing chamber was established using Matlab

and the packing size was determined to be 300 mm×400 mm×500 mm with the model

and an experimental bench was set up. An experimental test and energy efficiency analysis were carried out with the experimental bench. The following conclusions were drawn: the device can run stably; the condensation of water reaches up to 15 L/h; when the pump power is 5.46 kW

the energy efficiency ratio of the device reaches up to 4.54; the air circulating in the device is changed from 31 ℃ to 43 ℃

and the relative humidity is 94.6%. After operating for a certain period of time to reach the maximum concentration

the volume reached about 3/4 of the original

and the water was clear

which will greatly reduce the cost of industrial wastewater treatment.