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Processing method of ammonia-containing tannery wastewater

A technology for tannery wastewater and ammonia treatment, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of high concentration input into biological sewage treatment plants, cannot be discharged into the environment, etc. problems, achieve good economic benefits and reduce operating costs

Inactive Publication Date: 2015-05-20
QINGDAO BOYANDA IND TECH RES INST GENERAL PARTNERSHIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore they cannot be discharged into the environment and cannot be fed into biological wastewater treatment plants in high concentrations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for treating tannery wastewater containing ammonia, characterized in that the method comprises the steps of:

[0024] (1) Mix waste water from tanning with peat at a ratio of 15g / L, and keep at 180°C for 3 hours;

[0025] (2) Subsequently, the wastewater treated in this way was mixed with iron sulfate heptahydrate at 1.5 g / L. The temperature is gradually raised to 220°C and oxygen is added until the total pressure is up to 20Pa. After 2 hours, the wastewater is cooled and the concentration of nitrogen substances is detected;

[0026] (3) The above-mentioned treated wastewater is introduced into the anaerobic tank containing the film-hanging biological composite filler, and the residence time is 15h, and then the wastewater is introduced into the coagulation sedimentation tank to remove the suspended matter in the wastewater, and the sedimentation time is 2h;

[0027] (4) Let the tannery waste water be divided into two streams, cold and hot, from the upper part...

Embodiment 2

[0031] A method for treating tannery wastewater containing ammonia, characterized in that the method comprises the steps of:

[0032] (1) Mix the waste water from tanning with lignite at a ratio of 15g / L, and keep it at 180°C for 3.5h;

[0033] (2) Subsequently, the wastewater treated in this way was mixed with iron sulfate heptahydrate at 1.5 g / L. The temperature is gradually raised to 220°C and oxygen is added until the total pressure is up to 20Pa. After 2.5 hours, the wastewater is cooled and the concentration of nitrogen substances is detected;

[0034] (3) The above-mentioned treated wastewater is introduced into the anaerobic tank containing the film-hanging biological combination filler, and the residence time is 16h, and then the wastewater is introduced into the coagulation sedimentation tank to remove the suspended matter in the wastewater, and the sedimentation time is 2.5h;

[0035] (4) Let the tannery waste water be divided into two streams, cold and hot, from t...

Embodiment 3

[0039] A method for treating tannery wastewater containing ammonia, characterized in that the method comprises the steps of:

[0040] (1) Mix the waste water from tanning with lignite at a ratio of 15g / L, and keep it at 180°C for 4 hours;

[0041] (2) Subsequently, the wastewater treated in this way was mixed with iron sulfate heptahydrate at 1.5 g / L. The temperature is gradually raised to 220°C and oxygen is added until the total pressure is up to 20Pa. After 3 hours, the wastewater is cooled and the concentration of nitrogen substances is detected;

[0042] (3) The above-mentioned treated wastewater is introduced into the anaerobic tank containing the film-hanging biological combination filler, and the residence time is 18 hours, and then the wastewater is introduced into the coagulation sedimentation tank to remove the suspended matter in the wastewater, and the sedimentation time is 3 hours;

[0043] (4) Let the tannery waste water be divided into two streams, cold and ho...

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Abstract

The invention discloses a processing method of ammonia-containing tannery wastewater. The processing method comprises following steps: (1) the ammonia-containing tannery wastewater is mixed with an organic reducing agent at a certain ratio, and is heated to 180 DEG C, and the temperature is maintained for 3 to 4h; (2) an obtained mixture is mixed with ferrous sulfate heptahydrate; and an obtained mixed material is subjected to reaction; (3) the processed wastewater is delivered into a biofilm culturing biological combined stuffing-containing anaerobic pond, and after a certain period of time is delivered into a coagulative precipitation tank for precipitation; (4) a low-pressure deacidifying deaminizing tower is used for steam stripping; (5) a high-pressure deaminizing tower is used for further treatment; and (6) pH value of an obtained product is increased to be larger than 7, the product is delivered into an air stripping tower using a water pump, ammonia nitrogen obtained via air stripping is recycled, and pH value of the product is adjusted to 7 to 8. According to the processing method, valuable middle medium pressure steam can be replaced by excess low-pressure steam in a large degree; used devices are universal chemical separation devices; the processing method is mature and reliable; high concentration wastewater can be recycled; waste is changed into valuables; and recycling is realized.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a method for treating tannery wastewater containing ammonia. Background technique [0002] Leather wastewater mainly comes from pre-tanning preparation, tanning and other wet processing sections. The composition of pollutants in leather wastewater is complex, and there are many treatment methods for comprehensive wastewater, including biochemical processes and physical and chemical methods. Domestic leather wastewater treatment usually adopts a combination of physical and chemical treatment and biochemical treatment. This method has low investment, low operating costs, and can stably meet the discharge standards. [0003] For medium and small tanneries, the oxidation ditch process is not the best choice due to irregular production or lack of sufficient space, while the SBR process operates intermittently and has the characteristics of ideal pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 修相鹏
Owner QINGDAO BOYANDA IND TECH RES INST GENERAL PARTNERSHIP
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