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Treatment method and device of waste water containing ammonia

A treatment method and wastewater treatment technology, which are applied in water/sewage treatment, multi-stage water/sewage treatment, heating water/sewage treatment, etc., can solve the problems of large steam consumption and disadvantages, and achieve low equipment investment and low treatment cost. , the effect of simple operation

Inactive Publication Date: 2019-12-10
TIANJIN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ammonia distillation not only consumes a large amount of steam and alkali, but also has an adverse effect on the subsequent membrane treatment due to the addition of alkali, especially in the current environment with high requirements for environmental protection, water resource utilization and treatment costs. The advanced ammonia distillation biochemical treatment technology also puts forward higher requirements for new treatment capacity and cost

Method used

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  • Treatment method and device of waste water containing ammonia
  • Treatment method and device of waste water containing ammonia

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0031] This embodiment is an embodiment of the residual ammonia treatment in the coking industry, and the technological process is as follows figure 1shown. Ammonia-containing waste water raw water 1 (residual ammonia water) is heated to 90°C by a heat source in the preheater 2, and then sent to the distillation tower 3 to separate the ammonia and volatile organic compounds contained in the liquid phase from the liquid phase, and the ammonia in the effluent Concentration drops below 600mg / l. The liquid phase is heated at the bottom of the distillation tower (not shown in the figure), and the raw water discharged from the bottom of the distillation tower is heated up to remove the ammonia wastewater 4 and exchange heat with the remaining ammonia water, which is used as a preheating heat source for the remaining ammonia water, and the ammonia-containing waste water is discharged from the top of the distillation tower The gas 15 is sent to the gas system after being condensed, a...

Embodiment 2

[0034] This embodiment is basically the same as Embodiment 1, except that the remaining ammonia water is heated to 80°C by the heat source in the preheater and then sent to the evaporator (with figure 1 The middle distillation tower has the same function) in which the ammonia and volatile organic compounds contained in the liquid phase are separated from the liquid phase, the ammonia concentration in the effluent is reduced to below 800mg / l, and the gas at the top of the evaporator is condensed and sent to the gas system. There is steam heating at the bottom of the evaporation tower to keep the liquid phase temperature in the evaporation tower at 100°C, and the liquid discharged from the evaporator exchanges heat with the remaining ammonia raw water and is used as a preheating heat source for the remaining ammonia water. After heat exchange with the remaining ammonia water, the temperature of the heated deamination wastewater cooled down to 40°C enters the electrochemical treat...

Embodiment 3

[0037] This example is basically the same as Example 2, except that the coking residual ammonia water is heated to 98°C by the heat source in the preheater and then sent to the evaporator to combine the ammonia and volatile organic compounds contained in the liquid phase with the liquid phase. Separation, the concentration of ammonia in the effluent is reduced to below 500mg / l, and the bottom of the evaporation tower is heated by steam to keep the liquid phase temperature in the evaporation tower at 130°C. The electrochemically treated ammonia-containing wastewater is preheated and then sent to the electrochemically treated water evaporator. The ammonia concentration in the ammonia-containing wastewater is reduced to 150mg / l and then enters the biochemical system as biochemically treated water. The heating source is electrochemically treated. The water is discharged from the water evaporator, and the maximum temperature of the liquid phase of the electrochemically treated water...

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Abstract

The invention relates to a treatment method and device of waste water containing ammonia. The method at least includes the following processes that a process of temperature rising and ammonia removingof raw water containing the ammonia is conducted, specifically, the ammonia in the raw water is removed by heating the raw water of the waste water containing the ammonia to be risen at temperature;and a process of electrochemical treatment of raw water temperature-risen ammonia-removed waste water is conducted, specifically, the raw water temperature-risen ammonia-removed waste water after ammonia removing in the process of temperature rising and ammonia removing of the raw water containing the ammonia is electrochemically treated under a direct-current electric field. The most of the ammonia is removed through temperature rising and ammonia removing of the raw water of the waste water containing the ammonia at low cost, high-concentration ammonia-contained waste water is changed into low-concentration ammonia-contained waste water, the physical and chemical properties of the waste water are changed through electrochemical treatment, then low-cost alkali-free ammonia removing is realized through temperature rising and ammonia removing, and favorable conditions are provided for biochemical treatment and subsequent membrane treatment; and the difficulty that traditional ammonia distilling energy consumption is high is overcome through temperature rising and ammonia removing, and a technological way is provided for low-cost, alkali-free ammonia removing of the low-concentrationammonia-contained waste water by electrochemical treatment. According to the treatment method and device, the treatment cost is low, equipment investment is saved, and operation is easy.

Description

technical field [0001] The invention relates to a treatment method and device for ammonia-containing wastewater, in particular to removing most of the ammonia by raising the temperature of high-concentration ammonia-containing wastewater, and then performing electrochemical treatment and then raising the temperature to remove the ammonia in the wastewater to a concentration below the required concentration for biochemical treatment or membrane treatment. The energy consumption and alkali input in the ammonia distillation process are reduced, and the invention belongs to the fields of chemical industry and environmental protection. Background technique [0002] Ammonia-containing wastewater is one of the common wastewater produced in coal chemical industry, petrochemical industry and other industries. Especially for the treatment of high-concentration ammonia-nitrogen wastewater, methods such as wet oxidation, ion exchange, chemical precipitation, breakpoint chlorination, and...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/16C02F101/30
CPCC02F1/04C02F1/465C02F2101/16C02F2101/30
Inventor 张书廷成琼琼刘兴昕姜晴晴
Owner TIANJIN UNIV
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