Zero-discharge treatment process for salt-containing waste water

A salty waste water and treatment process technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high cycle rate, increased power consumption of circulating pumps, high flow rate, etc. problems, to achieve the effect of simple process, avoid frequent cleaning, and low operating cost

Inactive Publication Date: 2012-07-11
WUHAN COMEON ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the heater adopts a falling film evaporator, in order to delay the fouling on the surface of the heat exchange tube, the brine entering the heater adopts a cycle rate as high as 35 to 40 times, which makes the flow rate in the heat exchange tube high and wears out the tube wall; In addition, due to the high cycle rate, the power consumption of the circulating pump increases

Method used

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  • Zero-discharge treatment process for salt-containing waste water
  • Zero-discharge treatment process for salt-containing waste water
  • Zero-discharge treatment process for salt-containing waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A high-concentration salt-containing wastewater, total salt (TDS) content: 15000 mg / l, temperature 35°C, water volume 10t / h. It is required to achieve zero discharge after treatment, and the salt content of the reused water is less than 15 mg / l.

[0034] See figure 1 , The zero-discharge wastewater treatment process using vertical flash tower: including brine pump 1, centrifuge 2, concentrated brine pump 3, flash tank 4, agitator 5, water ejector 6, heat exchanger 7, degassing Tower 8, brine storage tank 9, flash tower feed pump 10, flash tower 11, brine distributor 12, demister 13, flash tower heater 14, steam ejector 15, steam trap 16, steam compressor 17. Concentrated brine pump at the bottom of the tower 18.

[0035] The flash tower 11 adopts a vertical method. The high-salinity wastewater C draws the flash steam from the flash tank 4 through the water ejector 6. The temperature of the wastewater is increased to about 40°C and enters the tube pass of the heat exchanger ...

Embodiment 2

[0038] A high-concentration salt-containing wastewater, total salt (TDS) content: 15000 mg / l, temperature 35°C, water volume 10t / h. It is required that the water reuse rate after treatment is ≥85%, the salt content of the reused water is less than 15 mg / l, and the concentrated brine is sent to the evaporation pond.

[0039] See figure 2 Compared with Example 1, the only difference is: For dry climate areas, if there is enough space for the installation of evaporation ponds, from the perspective of energy saving, the centrifuge 2 is eliminated, and the concentrated brine E is directly sent to the evaporation pond for natural Evaporation can save energy by 15-20%.

Embodiment 3

[0041] A high-concentration salt-containing wastewater, total salt (TDS) content: 15000 mg / l, temperature 35°C, water volume 30t / h. It is required to achieve zero discharge after treatment, and the salt content of the reused water is less than 15 mg / l.

[0042] See image 3 Compared with Example 1, only the vertical flash tower is changed to a combined flash tower. The combined tower is equipped with a stirrer 5. When the processing capacity is large, the combined flash tower is used, which is beneficial to the process Effective control of the process; in addition, the flash tower heater adopts the U-tube heat exchanger type, which is convenient for cleaning the tube bundle.

[0043] The salty wastewater zero-discharge treatment process of the present invention not only avoids frequent cleaning of the entire system, but also has simple process and low operating cost. Its popularization and application have positive significance for improving the efficiency of saline wastewater tr...

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Abstract

The invention provides a zero-discharge treatment process for salt-containing waste water. The process comprises the following steps of: a, performing flash evaporation on salt-containing waste water, exchanging heat with a condensate from a flash tower heater for further heating, entering a degassing tower for removing dissolved oxygen and carbon dioxide, entering a salt solution storage groove for mixing with a circulating salt solution flowing out of the bottom of the flash tower, feeding into a flash tower through a flash tower feed pump, spraying through a salt solution distributor, exchanging heat with steam produced at the bottom of the flash tower, and partially vaporizing; b, recovering heat from a condensate discharged from the flash tower heater through a heat exchanger, returning an extremely small amount of the condensate into a steam ejector for serving as steam saturated water, and feeding the remaining condensate serving as recycled water to a production device for reutilizing; and c, recovering heat from the other part of a concentrated salt solution discharged from the bottom of the flash tower by performing flash evaporation through a flash tank, and feeding the concentrated salt solution into a centrifuge for performing separating treatment or feeding to an evaporation pond for naturally evaporating. According to the zero-discharge treatment process for salt-containing waste water, frequent cleaning of an entire system is avoided; and the process is simple, and has low operating cost.

Description

[0001] Technical field [0002] The invention relates to an industrial wastewater treatment method, in particular to a zero-discharge treatment process for salt-containing wastewater. Background technique [0003] Generally, the zero-discharge treatment of salty wastewater mostly uses multi-effect evaporation technology. Although the steam consumption of the multi-effect evaporation zero-discharge wastewater treatment technology device decreases with the increase of the evaporation effect, its operating cost is still very high. Taking the evaporation capacity of 10t / h as an example, assuming the condensate and incoming water of the system If the temperature difference is 20℃, the theoretical steam consumption for evaporating 1000kg of water (pressure is 0.15~0.3MPa) is: 1000÷effect number +40 kg. If 3-effect evaporation is used, the theoretical steam consumption is 373 kg / t water. The 4-effect is 290 kg / t water. If calculated at the price of 100 yuan per ton of low-pressure steam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
Inventor 王发坤李厚涛
Owner WUHAN COMEON ENVIRONMENT ENG
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