Desalination method of waste water

A desalination and wastewater technology, applied in general water supply conservation, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of difficulty in implementation, troublesome operation and maintenance, high energy consumption, reduce energy consumption and improve freezing effect. Effect

Inactive Publication Date: 2010-11-24
中建中环新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Desalination by evaporation, membrane separation, ion exchange, electrodialysis, etc. is sometimes difficult to implement due to high energy consumption, large investment in equipment, troublesome operation and maintenance, etc.

Method used

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  • Desalination method of waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 10 L of waste brine containing 2% sodium chloride was pumped into raw water tank 1. From 8:00 to 10:00, switches 6 and 10 are turned on, switches 8 and 12 are turned off, heat pumps 11 and 13 work, and the raw water is pre-cooled to 0°C. The ice phase in the fresh water tank 2 melts.

[0022] The waste water pre-cooled to 0°C in the raw water tank 1 is pumped into the ice making / fresh water tank 2 through a pump. From 21:00 to 5:00 the next day, switches 6, 10, and 12 are closed, switch 8 is opened, and heat pump 11 works. 10 L of 2% sodium chloride containing waste brine at 0°C was frozen for 8 hours at a freezing temperature of -16°C. Freezing yields two phases of residual brine and ice. The volume of the remaining brine was 4.6 L and the sodium chloride content was 3.97%.

[0023] The remaining brine with a sodium chloride content of 3.97% in the ice-making / freshwater tank 2 was pumped into the high-concentration brine tank 3 through a pump. During the period fr...

Embodiment 2

[0027] 10 L of waste brine containing 4% sodium chloride was pumped into raw water tank 1. From 8:00 to 10:00, switches 6 and 10 are turned on, switches 8 and 12 are turned off, heat pumps 11 and 13 work, and the raw water is pre-cooled to 0°C. The ice phase in the fresh water tank 2 melts.

[0028] The waste water pre-cooled to 0°C in the raw water tank 1 is pumped into the ice making / fresh water tank 2 through a pump. From 21:00 to 7:00 the next day, switches 6, 10, and 12 are closed, switch 8 is opened, and heat pump 11 works. 10 L of 4% sodium chloride containing waste brine at 0°C was frozen for 10 hours at a freezing temperature of -18°C. Freezing yields two phases of residual brine and ice. The volume of the remaining brine was 4.1 L and the sodium chloride content was 8.60%.

[0029] The remaining brine with a sodium chloride content of 8.60% in the ice-making / freshwater tank 2 is pumped into the high-concentration brine tank 3 through a pump. During the period fr...

Embodiment 3

[0033] 10 L of waste brine containing 5% sodium chloride was pumped into raw water tank 1. From 8:00 to 10:00, switches 6 and 10 are turned on, switches 8 and 12 are turned off, heat pumps 11 and 13 work, and the raw water is pre-cooled to 0°C. The ice phase in the fresh water tank 2 melts.

[0034] The waste water pre-cooled to 0°C in the raw water tank 1 is pumped into the ice making / fresh water tank 2 through a pump. From 21:00 to 4:00 the next day, switches 6, 10, and 12 are closed, switch 8 is opened, and heat pump 11 works. 10 L of 5% sodium chloride containing waste brine at 0°C was frozen for 7 hours at a freezing temperature of -15°C. Freezing yields two phases of residual brine and ice. The volume of the remaining brine was 5.1 L and the sodium chloride content was 8.60%.

[0035] The remaining brine with a sodium chloride content of 8.60% in the ice-making / freshwater tank 2 is pumped into the high-concentration brine tank 3 through a pump. During the period fro...

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Abstract

The invention belongs to the environmental protection technical field, and in particular relates to a desalination method of waste water. The method is characterized by comprising the following steps: A. pre-cooling saline waste water to 0 DEG C; B. freezing the saline waste water at 0 DEG C into ice at the temperature of 0 to -25 DEG C for 3-10 hours to form two parts of residual saline water and an ice phase; C. carrying out solid-liquid separation on the residual saline water and the ice phase obtained by freezing; and D. melting the ice phase, wherein, the energy generated during the ice phase melting process is used for pre-cooling the saline waste water in step A. Compared with the traditional freezing method, about 80% of electricity consumed during the treatment process can be stored and recycled, thus greatly reducing energy consumption and having obvious significance of energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for desalination from waste water. Background technique [0002] Oil and natural gas drilling and production and some chemical, pharmaceutical, food and other industries will produce wastewater with high salt content, and direct discharge will cause environmental pollution. Desalination by evaporation, membrane separation, ion exchange, electrodialysis and other methods is sometimes difficult to implement due to high energy consumption, large equipment investment, and troublesome operation and maintenance. The freezing method is based on the fact that the distribution of the solute in the liquid-solid two phases is very different after the brine solution is partially frozen and frozen, the concentration in the liquid phase increases, and the concentration in the solid phase decreases, so that the The purpose of concentration and separation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/22C02F1/58
CPCY02A20/124
Inventor 李红军陈飞
Owner 中建中环新能源有限公司
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