Circulating treatment system and process of high concentration salt-containing wastewater

Abstract

The invention discloses a circulating treatment system of high concentration salt-containing wastewater. The system comprises an evaporating chamber, a condensation chamber, a solid-liquid separator, a mixing tank, a heat exchanger, a heat pump set, an air cooler and a draught fan, wherein the evaporating chamber, the condensation chamber and the draught fan are connected with each other to form a first circulating loop, a strong saline water outlet of the evaporating chamber is sequentially connected with the mixing tank and the heat exchanger, a water outlet end of the heat exchanger is connected with a tower top of the evaporating chamber to form a second circulating loop, a crystal substance outlet at the bottom of the evaporating chamber is connected with the solid-liquid separator, and a liquid outlet end of the solid-liquid separator is connected with the evaporating chamber to form a third circulating loop. The condensation chamber is sequentially connected with the condensation chamber of the heat pump set, the heat exchanger, the evaporating chamber of the heat pump set and the air cooler. A water outlet end of the air cooler is connected with a tower top of the condensation chamber to form a fourth circulating loop. After circulating treatment of wastewater through the circulating loops, salt in the wastewater can be crystallized and recovered, and water produced can be recycled, so that resourceful and harmless treatment of high concentration salt-containing wastewater is realized.

Description

technical field [0001] The invention relates to a waste water treatment system, in particular to a high-concentration salt-containing waste water evaporation and crystallization circulation treatment system and process, belonging to the field of environmental protection water treatment. Background technique [0002] With the development of my country's industry, the discharge of industrial wastewater is increasing day by day, a large part of which is high-concentration saline wastewater, which has many hazards to the ecological environment, and the main treatment method in industry is to use efficient salt-tolerant bacteria to treat or add water Dilute discharge, which wastes a lot of water resources, and cannot control the amount of salt discharged into the environment from the total amount. Therefore, the treatment of high-concentration saline wastewater has become an urgent problem for the domestic environmental protection industry. [0003] In order to solve the problem o...

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Problems solved by technology

But the disadvantage is that the corresponding supporting equipment also increases, which makes the whole system more complicated, occupies a larger area, and relatively increases the operating cost.

In the falling film evaporation technology, aiming at the disadvantages of poor heat transfer effect and low evaporation efficiency in the existing production technology, a high-efficiency falling film evaporator with reasonable structure and tangential feeding is proposed, so that when the liquid flows into the heat conducting device Uniform, greatly improving the heat transfer efficiency

However, the problem of easy fouling and clogging of falling film evaporation has not been solved, and falling film evaporation has the characteristics of high energy consumption and low heat reuse.

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