MVR evaporative combination device for percolate and treating method thereof

Abstract

The invention discloses an MVR (Mechanical Vapor Recompression) evaporative combination device for percolate and a treating method thereof. The device comprises an energy recovery device which is successively connected with a hot well, a circulating pump, a heat exchanger and a water inlet, wherein the water inlet is connected with a sprayer in the device; a heat exchange pipeline is arranged under the sprayer; the upper end of the heat exchange pipeline is connected with a steam collecting device; a steam compressor is arranged on the middle part of the heat exchange pipeline; a water generating tank is connected with an outlet end of the heat exchange pipeline and an air vent is also formed at the outlet end; the water generating tank is connected with a water generating tank through a water generating pump and the energy recovery device; the circulating pump is connected with a concentrated liquor water inlet pipe of the energy recovery device through a pipeline; the energy recovery device is connected with a concentrated water tank; the heat exchange pipeline of the heat exchanger is connected with the hot well through a pipeline; a steam generator is connected between the hot well and the steam collecting device; a pressure gauge is mounted on the heat exchanger; a control device is respectively in electric connection with the pressure gauge, the water feeding pump, the water generating pump, the concentrated water pump and the steam compressor. The device is used for converting the percolate membrane concentrated solution into the reuse water capable of being directly reused through multi-level heat exchange evaporation.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a combined device for evaporating leachate MVR and a treatment method thereof. Background technique [0002] In the past few decades, with the acceleration of urbanization and the rapid increase of population in our country, the continuous growth of industrial economy and the continuous improvement of people's living standards, the solid waste generated in urban life and industrial production activities has also exploded. growth trend. At present, domestic and foreign treatment methods for municipal solid waste mainly include sanitary landfill, incineration and high-temperature composting. Sanitary landfill has the advantages of large processing capacity, low processing cost, mature process technology and high safety. It is regarded as the preferred method for disposing of municipal solid waste and most industrial solid waste all over the worl...

AI Technical Summary

Problems solved by technology

After the multi-combination treatment process, the BOD5, NH3-N, TN and heavy metals in the effluent can meet the discharge requirements of the new standard, but the CODCr and chroma formed by the refractory organic matter still exceed the standard

[0004] In addition, this multi-combination treatment process has great limitations in application, mainly as follows:

[0005] (1) The pollutant concentration of landfill leachate is high, the components are complex, the fluctuation range is large, the color and smell are high, and the impact on the biological treatment system is relatively large

[0006] (2) There are many factors affecting the stable operation of the system, and it is only suitable for landfill leachate with good biodegradability, and cannot effectively treat humic acids that are difficult to biodegrade

[0007] (3) The construction period is long, and the landfill leachate can be effectively treated at the time of design, but it has been 2 to 3 years after the design when it is completed and operated, and it is difficult to operate under the optimal design parameters. The biodegradability of landfill leachate has been greatly reduced

[0008] (4) RO / NF influent water quality requirements are high, and the content of organic matter and inorganic salts should not be too high. Even after biological treatment, there will still be 500-800 mg / L of COD Cr that cannot be effectively treated

RO / NF will produce 20% to 30% concentrate at the beginning, and as the number of membrane regenerations increases, the concentrate will rise to 40% to 50%, resulting in a large amount of concentrate that cannot be resolved. processing, the processing cost is greatly increased

[0009] (5) The content of inorganic salts in the landfill leachate is high, resulting in serious membrane pollution and reducing the service life of the membrane

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