Device and method for deeply concentrating high-salt-content wastewater through low-temperature phase change crystallization and application

Abstract

The invention relates to a device and method for deeply concentrating high-salt-content wastewater through low-temperature phase change crystallization and application, which belong to the field of sewage treatment. The device comprises an inner cooling roller, an outer cooling roller, a first water mist spray head, a second water mist spray head, an inner cooling wall pressing roller, an outer cooling wall pressing roller, an inner cooling wall ice scraping plate, an outer cooling wall ice scraping plate, an ice body conveying disc and a driving device; the cross sections of the inner cooling roller and the outer cooling roller are ring-shaped, and the inner cooling roller and the outer cooling roller are of hollow structures and are filled with cooling liquid; rotating shafts are respectively arranged in the centers of the inner cooling roller and the outer cooling roller, and are respectively connected with a driving device, and theouter cooling roller internally contains theinner cooling roller. The nested double-roller efficient continuous ice-making, ice-removing and cold-transferring device is adopted to realize deep concentration and separation of high-salinity wastewater in a low-temperature freezing phase change crystallization mode, so that the efficiency is high, and the energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a technology for separating organic matter and inorganic salts from ice-water mixtures through low-temperature phase transition crystallization, in particular to an inner-sleeved double-drum high-efficiency continuous ice-making-deicing-cooling device and method to achieve its effect. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Freeze concentration is a concentration method that uses the principle of solid-liquid phase equilibrium between ice and aqueous solution to remove water from the solution in a solid state. Freeze concentration is a very old method. In food,...

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Problems solved by technology

[0004] However, the formation conditions and effects of freeze crystallization on different phase reactants (solutions) are very different. At the same time, in order to achieve low energy consumption and efficient crystallization separation, the conduction requirements of the whole process are often very high. The existing freeze concentration process equipment and The implementation methods basically use the traditional ice-making process and equipment. In fact, there is a huge difference between the freeze-concentration process for high-salt wastewater and the traditional ice-making process. If the freeze-concentration process for high-salt wastewater achieves continuous low cost, it will Uninterrupted high-efficiency heat conduction needs to be achieved throughout the entire process. After the ice body is formed, it adheres to the surface of the conduction medium to form a thicker and thicker ice film. The ice film will reduce the efficiency of conduction, reduce the efficiency of ice formation, and increase the cost of ice production; At the same time, the ice crystals formed by high-salt wastewater have higher requirements on the separation technology of crystal liquid. The greater the viscosity of the solution, the more difficult the separation, and the greater the entrainment loss of ice crystals; The purpose of deep concentration of saline wastewater is to separate the water in the solution from the dissolved organic matter and inorganic salts. Therefore, it is possible to separate and form a concentrated solution with the smallest volume and rich in inorganic salts in a proper ice-forming state. The key to achieving deep concentration of high-salt wastewater at low cost

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