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Method of freezing, concentrating and treating saline wastewater

A technology of freezing and concentrating salty wastewater, which is applied in the direction of chilled water/sewage treatment, general water supply saving, etc., can solve the problem of high cost of wastewater treatment, and achieve the effects of large-scale production, strong adaptability, and reduced equipment size

Active Publication Date: 2015-07-29
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing treatment process, the gray water treatment system needs to replenish a large amount of process water circulation from the outside, and at the same time discharge a large amount of wastewater to the outside to ensure that the salt content in the water will not corrode the pipeline and equipment, which makes the cost of wastewater treatment very high

Method used

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  • Method of freezing, concentrating and treating saline wastewater
  • Method of freezing, concentrating and treating saline wastewater
  • Method of freezing, concentrating and treating saline wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1, freezing and concentrating treatment of gasification furnace black water

[0061] like figure 1 As shown, the technological process of freezing and concentrating the black water of the gasification furnace in the present embodiment is as follows:

[0062] (1) Mixing of materials in the crystallizer

[0063] A. Raw water and concentrated brine: the black water raw water 01 from the gasifier of the upstream unit is first cooled to 45°C by the air cooler B1 to obtain raw water 02, and the raw water 02 is cooled to 40°C by the water cooler B2 to obtain raw water 03. The thicker saline waste water 16 (salt content is 4.5%, temperature is-1 ℃, pressure is 0.42MPa) from the bottom of crystallizer B3 and wash water and impurity 30 from the bottom of solid-liquid separator B4 are combined with the above-mentioned raw water 03 is mixed into 04 and sent to crystallizer B3.

[0064] B. Refrigerant: The gas-phase refrigerant 08 from the outlet of the compressor B7 i...

Embodiment 2

[0077] Embodiment 2, freezing and concentrating treatment of gasification furnace black water

[0078] like figure 2 As shown, the technological process of freezing and concentrating the black water of the gasification furnace in the present embodiment is as follows:

[0079] (1) Mixing of materials in the crystallizer

[0080] A. Raw water and concentrated brine: the black water raw water 01 from the upstream unit (with a salt content of 0.05% to 0.5%, a temperature of 75°C and a pressure of 0.5MPa) is cooled to 45°C to 50°C by air cooler B1 ℃ is raw water 02. The raw water 02 cooled by air cooling is the raw water 03 after being cooled to 40° C. by the water cooler B2. The raw water 03 and the chilled water 27 (at a temperature of 7° C.) from the deicing tank B5 are cooled by heat exchange in the heat exchanger B6. Raw water 04 after cooling and part low-temperature concentrated brine 16 from crystallizer B3 bottom (salt content is 4.5%, temperature is-1 ℃, pressure is ...

Embodiment 3

[0096] Embodiment 3, freezing and concentrating treatment of gasification furnace black water

[0097] like image 3 As shown, the technological process of freezing and concentrating the black water of the gasification furnace in the present embodiment is as follows:

[0098] (1) Mixing of materials in the crystallizer

[0099] A. Raw water and concentrated brine: Black water raw water 01 from the upstream unit (salt content: 0.05%, temperature: 75°C, pressure: 0.2MPa) is cooled by air cooler B1 to 45°C-50°C, that is, raw water 02. The raw water 02 cooled by air cooling is the raw water 03 after being cooled to 40° C. by the water cooler B2. The raw water 03 and the chilled water 27 (at a temperature of 7° C.) from the deicing tank B5 are cooled by heat exchange in the heat exchanger B6. Cooled raw water 04 and part of the low-temperature concentrated brine 16 from the bottom of the crystallizer B3 (salt content is 2%, temperature is -1 ° C, pressure is 0.12MPa) and from t...

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Abstract

The invention discloses a method of freezing, concentrating and treating saline wastewater. The method comprises the following steps: saline wastewater to be treated and a cooling agent are conveyed into a crystallizer to obtain a concentration solution of saline wastewater and solid ice crystals after heat transfer, and a part of the concentration solution of saline wastewater is expelled from the system; the solid ice crystals containing the concentration solution of saline wastewater are put into a solid-liquid separator to separate solid from liquid and the treated solid ice crystals are washed with water and put in an ice-melting jar to obtain chilled water after melting. The preparation method can achieve continuous operation at normal pressure or low pressure condition and is low in the requirement for devices; the cooling agent and the saline wastewater are in direct contact to transfer heat, so that the heat transfer efficiency is improved, the device size is effectively decreased and scale production can be achieved; according to technological requirements, saline water can be concentrated into different concentration levels, so that the treatment scale of the follow-up technologies is significantly decreased and the preparation method is good in adaptability; the preparation method is wide in application range and can be widely used in chemical industry (such as gasifier black water and wastewater treatment, and the like), sea water desalination, and the like.

Description

technical field [0001] The invention relates to a method for freezing and concentrating salty waste water, which belongs to the field of industrial waste water treatment. Background technique [0002] There are many processes for producing saline wastewater in industry, and the amount of water produced is also increasing year by year. Removing organic pollutants in saline wastewater can effectively improve the environmental pollution of discharged wastewater. Due to the toxicity and inhibitory effect of high salt on microorganisms, the biological treatment of saline wastewater encounters great obstacles. Therefore, the removal of salt in saline wastewater is one of the necessary steps in the purification of saline wastewater. [0003] At present, salt-containing desalination methods include lime / lime-soda ash softening method, membrane separation method (reverse osmosis membrane technology, electrodialysis technology, nanofiltration membrane technology), distillation desal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/22
CPCY02A20/124
Inventor 李永旺郝栩李向阳高琳耿春宇张丽杨勇余晓忠王刚
Owner SYNFUELS CHINA TECH CO LTD
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