Method for desalting and purifying sewage through refrigeration and centrifugation and device thereof

Abstract

The invention discloses a method for desalting and purifying sewage through refrigeration and centrifugation and a device thereof. The device consists of a water inlet system, an air-conditioning refrigeration system, a rotating cylinder ice production system, and an ice cube separation and collection system, wherein the water inlet system consists of a pre-cooling water tank, a submersible pump and a perforated spray pipe; the air-conditioning refrigeration system consists of a compressor, a condenser, a throttle valve and an evaporator; the rotating cylinder ice production system comprises an internal cylinder, an external rotating cylinder and a transmission system consisting of a variable-frequency adjustable-speed motor and a frequency converter; and the ice cube separation and collection system consists of a scraping knife, a square bucket, a screen and a centrifugal machine. The purification device can ensure that the removal rate of salinity in the sewage reaches between 80 and 96 percent and the removal rate of algae is kept between 35 and 70 percent. The method in which the sewage is desalted by adopting the device for desalting and purifying the sewage through refrigeration and centrifugation is suitable for large-scale continuous production; the production energy consumption is low; and the method and the device are widely applied to seawater desalination, strong water desalination and sewage purification in the future.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to sewage desalination and purification technology, in particular to methods for seawater desalination, RO concentrated water desalination and sewage purification, and more specifically to a frozen centrifugal sewage desalination and purification method and its device. Background technique [0002] With the change of the world environment, the increase of population, the acceleration of urbanization, the increase of industrial and agricultural pollution and the improvement of people's living standards, the whole world is facing a serious shortage of fresh water resources. China is one of the thirteen water-poor countries in the world, and its per capita water resources are only 1 / 4 of the world's. The shortage of fresh water resources has become a bottleneck restricting the development of my country's national economy and the improvement of people's living standards....

AI Technical Summary

Problems solved by technology

The water quality of the above two kinds of desalinated water cannot meet the needs of production and domestic applications, because during the cooling process, the salt water has no time to discharge the ice body and the high-concentration salt water wrapped in the ice causes the salt content in the desalinated water to be high. Therefore, it is necessary to combine it with other Methods to further remove the brine in ice crystals, these methods mainly include centrifugation, thawing, washing, extrusion, reverse osmosis, distillation, etc., so that high-concentration brine can be easily discharged from ice crystals to reduce the salt content of sea ice content, and finally obtain high-quality fresh water

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