Low-temperature normal-pressure double-effect high-salinity wastewater evaporation device and treatment method

Abstract

The invention discloses a low-temperature normal-pressure double-effect evaporation high-salinity wastewater device and a treatment method thereof. The device comprises a waste liquid pool, a filter, a waste liquid adding pump, a secondary evaporation device, a waste liquid heating device, a hot waste liquid adding pump, a primary evaporation device, a solid-liquid separator, a steam condensing device, a circulating fan and an absorption device. The treatment method is as follows: high-salinity wastewater is heated to 50-80 DEG C, is conveyed into the evaporation device through the circulating evaporation water pump, flows through filler in the evaporation chamber to form a water film, is mixed with wet air to form water vapor, is in full contact with air conveyed by a fan in the other direction, flows through the absorption system to adsorb part of volatile organic compounds after water is taken away by the air, and enters the condensing device so as to complete evaporation and condensation of the wastewater, so that the salt concentration is continuously increased, crystals are formed, and crystallized salt is separated out through the solid-liquid separator. Due to the fact that the running temperature is low, the device has the advantages of being not prone to scaling and blocking a system, convenient to operate and low in energy consumption, and industrialization is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of high-salt wastewater treatment, and in particular relates to a low-temperature and normal-pressure double-effect evaporation high-salt wastewater device and a treatment method thereof. Background technique [0002] High-salt wastewater refers to wastewater with a total salt content of at least 1%, which mainly comes from chemical plants and oil and natural gas processing, etc., and most of the salts contained in it are Cl - , SO 4 2- 、Na + , Ca 2+ Salt substances such as salts, these ion concentrations are too high, will inhibit and poison microorganisms, seriously pollute the environment, and its treatment issues have also attracted increasing attention. [0003] Although traditional biotechnology is widely used in the treatment of high-salt wastewater, due to the high salinity of high-salt wastewater, it will change the osmotic pressure of microbial cells, inhibit the growth of microbial cells, dest...

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Problems solved by technology

[0004] Aiming at the problems of low treatment efficiency, poor stability, high temperature, easy scaling and high energy consumption in the process of treating high-salt wastewater in the prior art, the present invention provides a low-temperature and atmospheric-pressure double-effect evaporation high-salt The waste water device and its treatment method, in the process of treating high-salt waste water, does not scale at low temperature, has the characteristics of preventing scale inhibition and clogging, high efficiency and energy saving, and is easy to realize industrial utilization

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