1. A complete denitrification method for high-concentration organic matter and high ammonia nitrogen wastewater is characterized by comprising the following steps:

s1, carrying out anaerobic reaction, namely adding the sewage into an IC anaerobic reactor, and discharging when the water quality C/N is less than 1.72;

s2, nitration reaction, namely, conveying the discharged water source of the IC anaerobic reactor to a short-cut denitrification tank and a short-cut nitrification tank in sequence for reaction, controlling DO of short-cut denitrification to be less than or equal to 0.2mg/L and BOD to be 0, controlling DO of short-cut nitrification to be in a range of 0.2-0.8 mg/L, properly adjusting short-cut nitrification to reflux of short-cut denitrification to be in a range of 2-40, HRT of short-cut denitrification to be 30-60 minutes, and HRT of short-cut nitrification to be 2-72 hours;

s3, separating sludge and water, namely lifting the sewage in the short-range nitrification and short-range denitrification to a first sludge and water separation system, and discharging the sewage when the ammonia nitrogen concentration in the water of the first sludge and water separation system reaches 5-1100 mg/L, the nitrite nitrogen concentration reaches 5-1300 mg/L, SS (suspended solid) in the sewage is less than or equal to 1mg/L, and SDI (Serial digital interface) is less than or equal to 5;

s4, anammox, namely conveying the sewage in the first sludge-water separation system to an anammox reactor, wherein the HRT is 2-48 hours, and when the ammonia nitrogen concentration of the effluent of the anammox reactor exceeds 0.2mg/L, the effluent is refluxed to the front end of the anammox reactor for retreatment, so that the ammonia nitrogen concentration of the effluent of the anammox reactor is less than 0.2 mg/L;

s5, performing synergistic denitrification, conveying the sewage after anaerobic ammonia oxidation to a synergistic denitrification tank, wherein the HRT is 45-75 minutes, and adding a carbon source according to the proportion of nitrate nitrogen/BOD (biological oxygen demand) 2.86 and nitrite nitrogen/BOD (biological oxygen demand) 1.72 in water quality to ensure that the concentration of nitrate nitrogen and nitrite nitrogen in the effluent of the anaerobic ammonia oxidation reactor is 1.0 mg/L;

and S6, performing sludge-water separation again, and discharging the water source in the synergetic denitrification device through a second sludge-water separation system until the water quality reaches the standard.

2. The method for complete denitrification of wastewater containing high concentration of organic matter and high ammonia nitrogen according to claim 1, wherein the method comprises the following steps: the C/N of the discharged water quality of the IC anaerobic reactor is 0-0.8.

3. The method for complete denitrification of wastewater containing high concentration of organic matter and high ammonia nitrogen according to claim 1, wherein the method comprises the following steps: the biogas generated in the IC anaerobic reactor can be used for generating electricity or can be made into combustible gas.

Background

In order to discharge COD (BOD5) and ammonia nitrogen (total nitrogen) which reach the standard in the used wastewater, various traditional biological denitrification processes (such as A/O, A2O2 and the like) have high operation cost, large occupied area and large investment cost, and in the face of increasingly complex water quality, COD (BOD5), ammonia nitrogen and total ammonia can not reach the standard and the domestic discharge standard can still be continuously improved.

Disclosure of Invention

The invention aims to solve the defects of high operation cost and the like of the traditional biological denitrification process in the prior art, and provides a complete denitrification method for high-concentration organic matter and high-ammonia nitrogen wastewater.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for completely denitrifying high-concentration organic matters and high-ammonia nitrogen wastewater is designed, and comprises the following steps:

s1, carrying out anaerobic reaction, namely adding the sewage into an IC anaerobic reactor, and discharging when the water quality C/N is less than 1.72;

s2, nitration reaction, namely, conveying the discharged water source of the IC anaerobic reactor to a short-cut denitrification tank and a short-cut nitrification tank in sequence for reaction, controlling DO of short-cut denitrification to be less than or equal to 0.2mg/L and BOD to be 0, controlling DO of short-cut nitrification to be in a range of 0.2-0.8 mg/L, properly adjusting short-cut nitrification to reflux of short-cut denitrification to be in a range of 2-40, HRT of short-cut denitrification to be 30-60 minutes, and HRT of short-cut nitrification to be 2-72 hours;

s3, separating sludge and water, namely lifting the sewage in the short-range nitrification and short-range denitrification to a first sludge and water separation system, and discharging the sewage when the ammonia nitrogen concentration in the water of the first sludge and water separation system reaches 5-1100 mg/L, the nitrite nitrogen concentration reaches 5-1300 mg/L, SS (suspended solid) in the sewage is less than or equal to 1mg/L, and SDI (Serial digital interface) is less than or equal to 5;

s4, anammox, namely conveying the sewage in the first sludge-water separation system to an anammox reactor, wherein the HRT is 2-48 hours, and when the ammonia nitrogen concentration of the effluent of the anammox reactor exceeds 0.2mg/L, the effluent is refluxed to the front end of the anammox reactor for retreatment, so that the ammonia nitrogen concentration of the effluent of the anammox reactor is less than 0.2 mg/L;

s5, performing synergistic denitrification, conveying the sewage after anaerobic ammonia oxidation to a synergistic denitrification tank, wherein the HRT is 45-75 minutes, and adding a carbon source according to the proportion of nitrate nitrogen/BOD (biological oxygen demand) 2.86 and nitrite nitrogen/BOD (biological oxygen demand) 1.72 in water quality to ensure that the concentration of nitrate nitrogen and nitrite nitrogen in the effluent of the anaerobic ammonia oxidation reactor is 1.0 mg/L;

and S6, performing sludge-water separation again, and discharging the water source in the synergetic denitrification device through a second sludge-water separation system until the water quality reaches the standard.

Preferably, the discharged water quality C/N of the IC anaerobic reactor is 0-0.8.

Preferably, the biogas generated in the IC anaerobic reactor can be used for generating electricity or producing combustible gas.

The invention provides a complete denitrification method for high-concentration organic matter and high ammonia nitrogen wastewater, which has the beneficial effects that:

the BOD5 in the wastewater is comprehensively utilized and degraded by short-range denitrification, so that the aim of first-step denitrification is fulfilled, the alkalinity balance of a water body is kept, alkali is not needed or little added, the environment is protected, the consumption is reduced, in addition, a BOD-free environment is provided for an anaerobic ammonia oxidation reactor, and a stable condition is provided for the high-efficiency denitrification of AAOB;

the process can be in complete seamless butt joint with a full-process nitrification denitrification or short-process nitrification denitrification system, occupies less land, has small investment, and is very suitable for improving quality and improving technical projects;

compared with the traditional biological denitrification, the power consumption is reduced by more than 60%, only a few carbon sources are needed to be added, and the treatment capacity is improved by more than 8 times; compared with the short-cut nitrification and denitrification, the power consumption is reduced by more than 40 percent, only a few carbon sources are needed to be added, and the treatment capacity is improved by more than 4 times.

Drawings

FIG. 1 is a schematic structural diagram of a complete denitrification method for wastewater with high concentration of organic matters and high ammonia nitrogen provided by the invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example one

Referring to fig. 1, a method for completely denitrifying high-concentration organic matter and high-ammonia nitrogen wastewater comprises the following steps:

s1, carrying out anaerobic reaction, namely adding the sewage into an IC anaerobic reactor, and discharging when the water quality C/N is equal to 0;

s2, nitration reaction, namely, conveying the discharged water source of the IC anaerobic reactor to a short-cut denitrification tank and a short-cut nitrification tank in sequence for reaction, controlling DO (DO) of the short-cut denitrification to be 0mg/L and BOD (BOD) to be 0, controlling DO of the short-cut nitrification to be in a 0.2mg/L interval, properly adjusting the short-cut nitrification to a reflux interval of 2, the HRT of the short-cut denitrification to be 30 minutes, and the HRT of the short-cut nitrification to be 2 hours;

s3, separating sludge and water, namely lifting the sewage in the short-cut nitrification and short-cut denitrification to a first sludge and water separation system, and discharging when the ammonia nitrogen concentration in the water of the first sludge and water separation system reaches 5mg/L, the nitrite nitrogen concentration reaches 5mg/L, SS in the sewage is 0mg/L, and SDI is 5;

s4, anammox, namely conveying the sewage in the first sludge-water separation system to an anammox reactor, wherein the HRT is 2 hours, and when the ammonia nitrogen concentration of the effluent of the anammox reactor is equal to 0.2mg/L, the effluent is refluxed to the front end of the anammox reactor for retreatment, so that the ammonia nitrogen concentration of the effluent of the anammox reactor is equal to 0 mg/L;

s5, performing coordinated denitrification, conveying the sewage after anaerobic ammonia oxidation to a coordinated denitrification tank, wherein the HRT is 45 minutes, and adding a carbon source according to the proportion of nitrate nitrogen/BOD (biological oxygen demand) 2.86 and nitrite nitrogen/BOD (biological oxygen demand) 1.72 in water quality to ensure that the concentration of nitrate nitrogen and nitrite nitrogen in the effluent of the anaerobic ammonia oxidation reactor is 1.0 mg/L;

and S6, performing sludge-water separation again, and discharging the water source in the synergetic denitrification device through a second sludge-water separation system until the water quality reaches the standard.

Example two

Referring to fig. 1, a method for completely denitrifying high-concentration organic matter and high-ammonia nitrogen wastewater comprises the following steps:

s1, carrying out anaerobic reaction, namely adding the sewage into an IC anaerobic reactor, and discharging when the water quality C/N is equal to 0.86;

s2, nitration reaction, namely, conveying the discharged water source of the IC anaerobic reactor to a short-cut denitrification tank and a short-cut nitrification tank in sequence for reaction, controlling DO (DO) of the short-cut denitrification to be 0.1mg/L and BOD (BOD) to be 0, controlling DO of the short-cut nitrification to be within 0.5mg/L, properly adjusting the short-cut nitrification to the reflux of the short-cut denitrification to be 21, the HRT of the short-cut denitrification to be 45 minutes, and the HRT of the short-cut nitrification to be 37 hours;

s3, separating sludge and water, namely lifting the sewage in the short-cut nitrification and short-cut denitrification to a first sludge and water separation system, and discharging the sewage when the ammonia nitrogen concentration in the water of the first sludge and water separation system reaches 552.5mg/L, the nitrite nitrogen concentration reaches 652.5mg/L, SS in the sewage is 0.5mg/L, and SDI is 2.5;

s4, anammox, namely conveying the sewage in the first sludge-water separation system to an anammox reactor, wherein the HRT is 25 hours, and when the ammonia nitrogen concentration of the effluent of the anammox reactor is equal to 0.6mg/L, the effluent is refluxed to the front end of the anammox reactor for retreatment, so that the ammonia nitrogen concentration of the effluent of the anammox reactor is equal to 0.1 mg/L;

s5, performing coordinated denitrification, conveying the sewage after anaerobic ammonia oxidation to a coordinated denitrification tank, wherein the HRT is 60 minutes, and adding a carbon source according to the proportion of nitrate nitrogen/BOD (biological oxygen demand) 2.86 and nitrite nitrogen/BOD (biological oxygen demand) 1.72 in water quality to ensure that the concentration of nitrate nitrogen and nitrite nitrogen in the effluent of the anaerobic ammonia oxidation reactor is 1.0 mg/L;

s6, carrying out mud-water separation again, and discharging the water source in the synergetic denitrification device through a second mud-water separation system until the water quality reaches the standard

EXAMPLE III

Referring to fig. 1, a method for completely denitrifying high-concentration organic matter and high-ammonia nitrogen wastewater comprises the following steps:

s1, carrying out anaerobic reaction, namely adding the sewage into an IC anaerobic reactor, and discharging when the water quality C/N is equal to 1.71;

s2, nitration reaction, namely, conveying the discharged water source of the IC anaerobic reactor to a short-cut denitrification tank and a short-cut nitrification tank in sequence for reaction, controlling DO (DO) of the short-cut denitrification to be 0.2mg/L and BOD (BOD) to be 0, controlling DO of the short-cut nitrification to be 0.8mg/L, and properly adjusting the short-cut nitrification to 40 of reflux of the short-cut denitrification, 60 minutes of HRT (HRT) of the short-cut denitrification and 72 hours of HRT of the short-cut nitrification;

s3, separating sludge and water, namely lifting the sewage in the short-cut nitrification and short-cut denitrification to a first sludge and water separation system, and discharging when the ammonia nitrogen concentration in the water of the first sludge and water separation system reaches 1100mg/L, the nitrite nitrogen concentration reaches 1300mg/L, SS (suspended solid) in the sewage is 1mg/L, and SDI (Serial digital interface) is 5;

s4, anammox, namely conveying the sewage in the first sludge-water separation system to an anammox reactor, wherein the HRT is 48 hours, and when the ammonia nitrogen concentration of the effluent of the anammox reactor is equal to 1mg/L, the effluent is refluxed to the front end of the anammox reactor for retreatment, so that the ammonia nitrogen concentration of the effluent of the anammox reactor is equal to 0.2 mg/L;

s5, performing coordinated denitrification, conveying the sewage after anaerobic ammonia oxidation to a coordinated denitrification tank, wherein the HRT is 75 minutes, and adding a carbon source according to the proportion of nitrate nitrogen/BOD (biological oxygen demand) 2.86 and nitrite nitrogen/BOD (biological oxygen demand) 1.72 in water quality to ensure that the concentration of nitrate nitrogen and nitrite nitrogen in the effluent of the anaerobic ammonia oxidation reactor is 1.0 mg/L;

and S6, performing sludge-water separation again, and discharging the water source in the synergetic denitrification device through a second sludge-water separation system until the water quality reaches the standard.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.