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A process for realizing zero discharge of chemical sewage

A technology for chemical sewage and process methods, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of filtration and multi-effect evaporation operation, bacterial death, multi-effect evaporation Problems such as high energy consumption

Active Publication Date: 2019-02-22
薛斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) The process flow is long and complicated, the reliability is poor (subject to fragile biochemical bacteria), and the area is large;
[0008] (2) High energy consumption and unbearable operating costs;
[0009] (3) It is necessary to add lye to decompose the ammonia salt in the chemical sewage during distillation, otherwise the bacteria of biochemical treatment cannot effectively degrade the ammonia nitrogen to meet the environmental protection standard, and the cost of lye is high;
[0010] (4) The impurity concentration of the wastewater discharged from the distillation tower has a great influence on the adaptability of biochemical bacteria. If the impurity concentration is too high, it will cause the death of bacteria and make the biochemical treatment invalid;
[0011] (5) The instability of biochemical treatment makes it difficult to operate filtration and multi-effect evaporation;
[0012] (6) The energy consumption of multi-effect evaporation is large;
[0013] (7) Secondary pollution: During the biochemical treatment of wastewater, a large amount of sludge containing various polluting impurities and bacteria is continuously produced. Improper disposal of the sludge can easily cause secondary pollution; pools and filtered concentrate pools may leak to contaminate the groundwater, and these open pools emit unpleasant gases which in turn lead to secondary pollution;

Method used

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  • A process for realizing zero discharge of chemical sewage
  • A process for realizing zero discharge of chemical sewage
  • A process for realizing zero discharge of chemical sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0166] In a specific embodiment of the present invention, the heat balance of evaporation and distillation is realized in the manner described, the first chemical sewage is in the sewage / condensed water heat exchanger, and the circulating waste water is recycled in the partial condensation cooler and heater. 90-95% of the heat required for distillation, the second evaporation steam and the distillation steam are compressed, and the heat of compression makes the total heat of the compressed steam be 100-103% of the heat required for evaporation and distillation. 84-88% of the total heat is used for evaporation heat supply, and the remaining 12-16% is used for distillation heat supply.

[0167] The 75°C chemical sewage from outside the boundary area is heat-exchanged to 98°C by the steam condensate in the sewage / condensate heat exchanger 10, and then in the chemical sewage / wastewater heat exchanger with the 123°C waste water from the bottom of the distillation tower The heat is ...

Embodiment 1

[0183] Attached according to the invention figure 1 During the zero discharge process of chemical sewage, the chemical sewage is first heated by steam condensate in the chemical sewage / condensate heat exchanger 10, and then in the chemical sewage / wastewater heat exchanger 11, it exchanges heat with the high-temperature wastewater from the bottom of the distillation tower After that, it enters the upper part of the distillation column 1.

[0184] Ammonia vapor (containing hydrogen sulfide, etc.) escapes from the top of the distillation tower 1, and after being condensed and cooled by the circulating waste water from the evaporator 3 in the partial condensation cooler 2, it is sent to the outside of the boundary area.

[0185] The high-temperature wastewater at the bottom of the distillation tower 1 enters the evaporator 3 for evaporation after being cooled by the chemical wastewater in the chemical wastewater / wastewater heat exchanger 11 .

[0186] The steam from the top of t...

Embodiment 2

[0193] Attached according to the invention figure 2 During the zero-discharge process of chemical sewage, 80-90% of the chemical sewage enters the upper part of the distillation tower 1 after being heated by steam condensate in the sewage / condensate heat exchanger 10. 10-20% of chemical sewage directly enters the top of the distillation tower in the form of cold material.

[0194] After the hydrogen sulfide gas is condensed and cooled by the cold chemical sewage at the top of the distillation tower 1, it is sent outside the boundary area.

[0195] The ammonia vapor from the side line of the distillation tower is sent to the outside of the boundary area after being condensed by the subcondenser; the condensed liquid is returned to the chemical sewage.

[0196] The high-temperature waste water at the bottom of the distillation tower 1 is directly evaporated in the evaporator 3 . The fresh steam heats the circulating waste water from the bottom of the distillation tower 1 in t...

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Abstract

The invention provides a process for realizing chemical sewage zero discharge. The process comprises distillation, evaporation, crystallization separation, compression, condensation and recovery, and washing and filtration. Through circulation of the above processes, water in the system can be recycled so that chemical sewage zero discharge is realized.

Description

technical field [0001] The invention relates to a process method for chemical sewage treatment, in particular to a process method for realizing chemical sewage treatment. It is suitable for metallurgical coking, petrochemical and coal chemical (hereinafter referred to as "chemical") and other industries containing NH 3 and H 2 S and HCN, CO 2 The field of chemical sewage treatment of impurities. Background technique [0002] According to the difference of C (carbon), H (hydrogen), S (sulfur), N (nitrogen) and other components in raw materials and the selection of processing technology, NH is generated during the production process. 3 and H 2 S and HCN, CO 2 , ammonium salt and other impurities, these impurities dissolve in water to form chemical sewage. According to the requirements of environmental protection standards, chemical sewage cannot be discharged directly, but must be treated. The chemical industry is an industry that requires a large amount of fresh water....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
Inventor 薛斌
Owner 薛斌