CN110697988B - anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system and process - Google Patents

anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system and process Download PDF

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CN110697988B
CN110697988B CN201911026087.9A CN201911026087A CN110697988B CN 110697988 B CN110697988 B CN 110697988B CN 201911026087 A CN201911026087 A CN 201911026087A CN 110697988 B CN110697988 B CN 110697988B
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sacr
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sewage
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CN110697988A (en
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王凯
武道吉
谭凤训
罗从伟
成小翔
李宏业
田宇
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Shandong Jianzhu University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1263—Sequencing batch reactors [SBR]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/005—Processes using a programmable logic controller [PLC]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/04—Oxidation reduction potential [ORP]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2

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  • Biodiversity & Conservation Biology (AREA)
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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
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Abstract

The invention provides an anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system and a process, wherein high ammonia nitrogen sewage firstly enters an anaerobic reactor to remove most organic matters, after water is discharged, the high ammonia nitrogen sewage sequentially enters an SBR water inlet tank and an SBR reactor, biochemical organic matters, ammonia nitrogen and part of total nitrogen are removed through pre-denitrification and nitrification by the SBR, after the water is discharged, the high ammonia nitrogen sewage enters an intermediate water tank, meanwhile, through the control of a water quality detection device and a PLC (programmable logic controller), part of raw water is introduced into the intermediate water tank to adjust the carbon nitrogen ratio of the sewage, then, the discharged water enters the SACR reactor, the characteristic of denitrifying bacteria is utilized, and the SACR reactor is regulated and controlled by an p H/DO/ORP (oxygen demand/oxygen reduction) detector and the PLC controller, so that the sewage is accurately subjected to pre-denitrification-nitrification-endogenous denitrification, thereby realizing the deep denitrification, and simultaneously, without adding a carbon source, the process cost is low, and for the established sewage treatment facility adopting the SBR process, the process of the technical scheme can be implemented only by adding an intermediate water tank and an SACR reactor, so that the upgrading and reconstruction cost is low.

Description

anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system and process
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system and process.
Background
At present, along with the enhancement of environmental protection consciousness, the enhancement of environmental pollution treatment intensity and the development of environmental protection technology, water pollution preliminarily obtains more effective control, but the discharge to reach standard of common high ammonia nitrogen waste water still is the problem that needs to solve urgently in industrial production. The high ammonia nitrogen wastewater mainly comes from the industries of chemical fertilizers, petrochemical industry, cultivation, garbage treatment and the like, and in the aspect of high ammonia nitrogen wastewater treatment, not only the technical index of high-efficiency denitrification needs to be pursued, but also the reduction of energy consumption, energy conservation and the reduction of operation treatment cost need to be considered.
At present, one of the most important processes adopted for the treatment of high ammonia nitrogen wastewater at home and abroad is the traditional SBR process. The traditional SBR process generally adopts a post denitrification method to realize the deep denitrification of the wastewater, but needs an additional carbon source, and has higher process treatment cost.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides an anaerobic SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system and process, which can deeply denitrify high ammonia nitrogen sewage, does not need an external carbon source, has low process treatment cost, can implement the process of the technical scheme only by adding an intermediate water tank and an SACR reactor for the established sewage treatment facility adopting the SBR process, and has low upgrading and reconstruction cost. The specific technical scheme is as follows:
the invention firstly provides an anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system, which comprises:
the system comprises an adjusting tank, an anaerobic reactor, a SBR water inlet tank, a SBR reactor, an intermediate water tank and an SACR reactor which are sequentially communicated through pipelines, wherein the SACR reactor is a self-carbon source self-adaptive reactor which is fully called in Chinese;
the outlet end of the regulating pool is communicated with the inlet end of the middle pool through a pipeline, and a water pump for regulating the flow is arranged on the pipeline;
the middle water tank is provided with water quality detection equipment;
the SACR reactor is provided with an p H detector, a DO detector, an ORP detector, aeration equipment and a stirrer;
the device is characterized by further comprising a PLC, wherein the PLC is in communication connection with the water quality detection device, the p H detector, the DO detector, the ORP detector, the aeration device and the stirrer respectively.
In some embodiments of the invention, the PLC controller further comprises a computer communicatively coupled to the PLC controller.
In some embodiments of the invention, the volume of the SBR intake pool is determined according to the amount of wastewater water;
the specific calculation method comprises the following steps: volume of SBR intake pool = daily water quantity of sewage x 0.5 m3；
The volume of the SBR reactor is according to the high ammonia nitrogen sewage water volume and the total nitrogen concentration of the high ammonia nitrogen sewage;
the specific calculation method comprises the following steps: volume of SBR reactor = a × (total nitrogen concentration value of high ammonia nitrogen wastewater/wastewater volume value of 50 × 30 × per hour) m3(ii) a Wherein the range of a is 1-1.5, the unit of the total nitrogen concentration value of the high ammonia nitrogen sewage is mg/L, and the unit of the sewage water amount per hour is m3；
In some embodiments of the invention, the volume of the SACR reactor is determined by the amount of high ammonia nitrogen wastewater and the total nitrogen concentration of the high ammonia nitrogen wastewater;
the specific calculation method comprises the following steps: SACR volume = a x (total nitrogen concentration value of high ammonia nitrogen wastewater/wastewater volume value of 50 x 20 x per hour) m3(ii) a Wherein the range of a is 1-1.5, the unit of the total nitrogen concentration value of the high ammonia nitrogen sewage is mg/L, and the unit of the sewage water amount per hour is m3。
The invention also provides a process for treating high ammonia nitrogen sewage by the denitrification system by using the SBR-SACR combined process, which comprises the following steps:
(1) the high ammonia nitrogen sewage enters an anaerobic reactor from an adjusting tank, macromolecular degradation-resistant organic matters in the high ammonia nitrogen sewage are decomposed into micromolecules, and most organic matters in the high ammonia nitrogen sewage are removed;
(2) the effluent of the anaerobic reactor enters an SBR water inlet tank and then enters an SBR reactor, and pre-denitrification and nitrification are carried out through the SBR to remove biochemical organic matters, ammonia nitrogen and partial total nitrogen in the sewage;
(3) the pond in the middle of the play water entering of SBR reactor, simultaneously, through quality of water check out test set and PLC controller regulation and control, the water pump carries out the regulation of sewage carbon nitrogen ratio with some high ammonia nitrogen sewage from the pond in the middle of introducing of equalizing basin, and the regulation rule of sewage carbon nitrogen ratio is: the COD concentration of the mixed sewage = the total nitrogen concentration of the outlet water of the SBR reactor multiplied by b + the ammonia nitrogen concentration of the inlet water of the middle water tank multiplied by b, wherein the range of b is 4-6;
(4) after sewage enters the SACR reactor from the middle water tank, anoxic stirring is firstly carried out, when the pH value is changed from rising to falling, the preposed denitrification in the SACR reactor is shown to be finished, then, T hours later, stirring is stopped, aeration nitrification is started, when the pH value in the SACR reactor is increased from falling to rising and DO is greatly increased, the nitrification in the SACR reactor is shown to be finished, at the moment, aeration is closed, stirring is continued, endogenous denitrification is started, the change of ORP in the SACR reactor is observed, when the ORP in the SACR reactor is rapidly reduced, the denitrification in the SACR reactor is shown to be finished, at the moment, stirring is closed, and water is precipitated and discharged.
In some embodiments of the invention, T ranges from 0 to 2.
In some embodiments of the invention, the feed water to the anaerobic reactor has a carbon to nitrogen ratio of greater than 5: 1, the volume load of the anaerobic reactor is 4-8 k gCOD/m3Day.
In some specific embodiments of the invention, the sludge concentration of the SBR process is controlled to be 4000 mg/L-5000 mg/L, the water drainage ratio is 25% -30%, the water inlet time is 30 minutes, and the precipitation time is 60 minutes.
In some embodiments of the invention, the sludge concentration of the SACR process is controlled to be 5000-8000 mg/L, the drainage ratio is controlled to be 25-30%, the water inlet time is 30-60 minutes, and the precipitation time is 60-90 minutes.
The invention has the beneficial effects that: compared with the prior art, the anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system and process can realize deep denitrification of high ammonia nitrogen sewage without adding any carbon source through the pre-denitrification of the SBR process, the pre-denitrification of the SACR and the post-endogenous denitrification; the total nitrogen removal rate of the SBR process can reach 70-80%, the total nitrogen removal rate of the SACR can reach more than 95%, the total nitrogen removal rate of the final effluent of the system can stably reach more than 95%, no carbon source is added, the process treatment cost is effectively reduced, meanwhile, for the established sewage treatment facility adopting the SBR process, the process of the technical scheme can be implemented only by adding an intermediate water tank and an SACR reactor, the purpose of deep denitrification can be realized, the existing sewage treatment facility does not need to be completely inverted and rebuilt, and the upgrading and reconstruction cost is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of an anaerobic SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system provided by the invention;
FIG. 2 shows the removal of contaminants from various functional areas of the present invention;
FIG. 3 shows the variation of contaminants during one SACR cycle of the present 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 should be understood that the described embodiments are only a part of the embodiments of the present invention, and should not be used to limit the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
Example 1: anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system
As shown in figure 1, an anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system comprises a regulating tank, an anaerobic reactor, a SBR water inlet tank, a SBR reactor, an intermediate water tank and an SACR reactor which are sequentially communicated through pipelines; the outlet end of the regulating pool is communicated with the inlet end of the middle pool through a pipeline, and a water pump for regulating the flow is arranged on the pipeline; the middle water tank is provided with water quality detection equipment; the SACR reactor is provided with an p H detector, a DO detector, an ORP detector, aeration equipment and a stirrer; the device is characterized by further comprising a PLC, wherein the PLC is in communication connection with the water quality detection device, the p H detector, the DO detector, the ORP detector, the aeration device and the stirrer respectively.
In this embodiment, the anaerobic reactor is a UASB reactor or an IC reactor.
The inventor finds that the denitrifying bacteria have the characteristic of storing carbon sources in the experimental process, and meanwhile, the denitrifying bacteria are facultative bacteria and can breathe under the aerobic or anoxic condition; when the sewage is in an anaerobic state and contains a large amount of organic matters, the organic matters in the sewage are absorbed into the body by denitrifying bacteria to form an internal carbon source; when the sewage is lack of organic matters but contains nitrate nitrogen or nitrite nitrogen and the dissolved oxygen is low (< 0.1 mg/L), the denitrifying bacteria can utilize internal carbon sources stored in the body to perform anoxic respiration to obtain energy, namely, endogenous denitrification is performed.
The inventor designs the technical scheme based on the characteristics of denitrifying bacteria, can realize deep denitrification of high ammonia nitrogen sewage, wherein an SACR reactor and a process play a vital role in deep denitrification, and the working principle is as follows: the water quality detection equipment, the water pump and the PLC are utilized to adjust the carbon-nitrogen ratio of the inlet water of the SACR reactor, so that the COD concentration of the mixed sewage of the intermediate water tank is equal to 4-6 times of the total concentration of the outlet water of the SBR reactor and the inlet water ammonia nitrogen concentration of the intermediate water tank; after water enters, the SACR reactor is firstly subjected to anoxic stirring, denitrifying bacteria utilize a high ammonia nitrogen sewage carbon source to carry out pre-denitrification in an anoxic state, the carbon source in the high ammonia nitrogen sewage is absorbed into the body of the denitrifying bacteria, and when a detection result shows that a p H value is changed from rising to falling through an p H detector and a PLC (programmable logic controller), the pre-denitrification stage is finished; stopping stirring after T hours, wherein the value of T is 0-2, starting aeration by the system, carrying out aerobic respiration by nitrifying bacteria to generate nitrification, converting ammonia nitrogen in the sewage into nitrite nitrogen and nitrate nitrogen, monitoring by an p H detector, a DO detector and a PLC (programmable logic controller), and indicating that nitrification is finished when p H shows that the inflection point is lowered to be raised and DO is greatly raised; at the moment, the aeration is stopped, the stirring is continued, denitrifying bacteria can utilize a carbon source stored in a body to perform anoxic respiration under the condition of oxygen deficiency and rich nitrate nitrogen and nitrite nitrogen, based on the characteristic, a stage of endogenous denitrification begins to enter the reactor, the total nitrogen is well removed, an ORP detector and a PLC (programmable logic controller) monitor is used for monitoring, when the ORP is greatly reduced, the end of the denitrification stage is indicated, the stirring is stopped at the moment, and the water is precipitated and drained. The advanced denitrification of the high ammonia nitrogen sewage can be effectively realized through three stages of pre-denitrification-nitrification-endogenous denitrification.
Example 2: anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification process
The process in this example is based on the system in example 1, and the anaerobic reactor is a UASB reactor; volume of SBR intake pool = daily water quantity of sewage x 0.5 m3(ii) a Volume of SBR reactor = (total nitrogen concentration value of high ammonia nitrogen sewage/50 x 30 x sewage water content value per hour) m3(ii) a The unit of the total nitrogen concentration value of the high ammonia nitrogen sewage is mg/L, and the unit of the sewage water amount per hour is m3(ii) a SACR volume = (total nitrogen concentration value of high ammonia nitrogen sewage/sewage water content value of 50 multiplied by 20 multiplied by hour) m3(ii) a The unit of the total nitrogen concentration value of the high ammonia nitrogen sewage is mg/L, and the unit of the sewage water amount per hour is m3。
An anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification process comprises the following steps:
(1) the high ammonia nitrogen sewage enters an anaerobic reactor from a regulating tank, wherein the volume load of the anaerobic reactor is 6k gCOD/m3Decomposing macromolecular refractory organic matters in the high ammonia nitrogen sewage into micromolecules, and removing most of organic matters in the high ammonia nitrogen sewage;
(2) the effluent of the anaerobic reactor enters an SBR (sequencing batch reactor) water inlet tank which plays a role in storing water and adjusting flow, and after the effluent enters the SBR reactor, the effluent is subjected to pre-denitrification and nitrification through the SBR to remove biochemical organic matters, ammonia nitrogen and part of total nitrogen in the sewage; wherein the sludge concentration of the SBR process is controlled at 4500mg/L, the water discharge ratio is 25%, the water inlet time is 30 minutes, and the precipitation time is 60 minutes;
(3) the pond in the middle of the play water entering of SBR reactor, simultaneously, through quality of water check out test set and PLC controller regulation and control, the water pump carries out the regulation of sewage carbon nitrogen ratio with some high ammonia nitrogen sewage from the pond in the middle of introducing of equalizing basin, and the regulation rule of sewage carbon nitrogen ratio is: the COD concentration of the mixed sewage = the total nitrogen concentration of the outlet water of the SBR reactor multiplied by b + the ammonia nitrogen concentration of the inlet water of the middle water tank multiplied by b, wherein the range of b is 4-6;
(4) after sewage enters the SACR reactor from the intermediate water tank, anoxic stirring is firstly carried out, when the pH value is reduced from rising to falling, the preposed denitrification of the system is finished, at the moment, the stirring is stopped, the aeration nitrification is started, when the pH value of the system is reduced from rising to rising and the dissolved oxygen is greatly increased, the nitrification of the system is finished, at the moment, the aeration is closed, the stirring is continued, the endogenous denitrification is started, the change of the ORP of the system is observed, when the ORP of the system is rapidly reduced, the denitrification of the system is finished, at the moment, the stirring is closed, and precipitation and drainage are carried out; wherein the sludge concentration of the SACR process is controlled at 6000mg/L, the drainage ratio is controlled at 25%, the water inlet time is 30 minutes, and the precipitation time is 60 minutes.
In the embodiment, a UASB + SBR + SACR combined process is adopted, and the treated object is landfill leachate with COD of 18000mg/L +/-200 mg/L and ammonia nitrogen concentration of 1600mg/L +/-100 mg/L. The removal condition and the removal rate of pollutants in each functional area of the system are shown in figure 2, and as can be seen from figure 2, after the leachate enters the UASB reactor, COD is obviously reduced, and the removal rate reaches about 63 percent. Then, the leachate is treated by an SBR reactor, the COD, ammonia nitrogen and total nitrogen of effluent are respectively 850mg/L, 1.2mg/L and 460mg/L, and the removal rates of the COD, the ammonia nitrogen and the total nitrogen respectively reach about 95%, 99% and 71%. Through the regulation of the middle water tank, the COD, ammonia nitrogen and total nitrogen of the leachate are 3100mg/L, 170mg/L and 620mg/L respectively. Then the leachate enters an SACR reactor for final denitrification. The concentrations of COD, ammonia nitrogen and total nitrogen in effluent of SACR are 820mg/L, 1.1mg/L and 25mg/L respectively. The removal rates of COD, ammonia nitrogen and total nitrogen respectively reach about 95%, 99% and 98%, and the deep denitrification of the leachate is realized.
The variation of the contamination during one cycle of the SACR is shown in FIG. 3.
As can be seen from FIG. 3, the influent COD, ammonia nitrogen and total nitrogen concentrations of the SACR reactor were 3100mg/L, 172mg/L and 620mg/L, respectively. After the water is fed, the concentration of the pollutants is reduced to a certain extent due to the dilution effect. Subsequently, the reactor started to be stirred anoxic. In the stirring process, as the pre-denitrification is carried out, COD, total nitrogen and nitrite nitrogen of the sewage are obviously reduced, and the concentration of ammonia nitrogen is not obviously changed. When the pre-denitrification is finished, nitrite nitrogen in the sewage is subjected to denitrification, the concentration is almost 0mg/L, so that the total nitrogen is obviously reduced from 185mg/L to 48mg/L in the initial stage of the reaction, and COD is reduced from 1580mg/L to 1000mg/L in the initial stage of the reaction. And then, aerating the system, gradually reducing the ammonia nitrogen concentration, reducing the COD concentration to a certain degree, and finishing nitrification after 2 hours, wherein the ammonia nitrogen concentration is almost 0mg/L, the COD concentration is 945mg/L, and the rest is refractory organic matters. Because the synchronous nitrification and denitrification process occurs in the aeration process, the total nitrogen concentration is reduced to 40mg/L from 48mg/L at the beginning of aeration. And then, the system starts to continue anoxic stirring, the post-endogenous denitrification is carried out, in the endogenous denitrification process, COD (chemical oxygen demand) and ammonia nitrogen are basically unchanged, but nitrite nitrogen concentration and total nitrogen concentration are continuously reduced, which indicates that the sludge utilizes an internal carbon source to carry out denitrification. When the reaction is carried out for 9 hours, the nitrite nitrogen and ammonia nitrogen in the system are degraded, the total nitrogen concentration is 5mg/L, and the deep denitrification of the percolate is realized.
The above embodiments are only specific examples of the present invention, and the protection scope of the present invention includes but is not limited to the product forms and styles of the above embodiments, and any suitable changes or modifications made by those skilled in the art according to the claims of the present invention shall fall within the protection scope of the present invention.

Claims (5)

1. An anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification process is characterized in that:
the anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification process is carried out in an anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system, and the anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification system comprises a regulating tank, an anaerobic reactor, a SBR water inlet tank, a SBR reactor, an intermediate water tank and an SACR reactor which are sequentially communicated through pipelines; the outlet end of the regulating pool is communicated with the inlet end of the middle pool through a pipeline, and a water pump for regulating the flow is arranged on the pipeline; the middle water tank is provided with water quality detection equipment; the SACR reactor is provided with an p H detector, a DO detector, an ORP detector, aeration equipment and a stirrer; the device is characterized by also comprising a PLC (programmable logic controller), wherein the PLC is respectively in communication connection with the water quality detection device, the p H detector, the DO detector, the ORP detector, the aeration device and the stirrer;
the anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification process comprises the following steps:
s1: the high ammonia nitrogen sewage enters an anaerobic reactor from an adjusting tank, macromolecular degradation-resistant organic matters in the high ammonia nitrogen sewage are decomposed into micromolecules, and most organic matters in the high ammonia nitrogen sewage are removed;
s2: the effluent of the anaerobic reactor enters an SBR water inlet tank and then enters an SBR reactor, and pre-denitrification and nitrification are carried out through the SBR to remove biochemical organic matters, ammonia nitrogen and partial total nitrogen in the sewage;
s3: the pond in the middle of the play water entering of SBR reactor, simultaneously, through quality of water check out test set and PLC controller regulation and control, the water pump carries out the regulation of sewage carbon nitrogen ratio with some high ammonia nitrogen sewage from the pond in the middle of introducing of equalizing basin, and the regulation rule of sewage carbon nitrogen ratio is: the COD concentration of the mixed sewage = the total nitrogen concentration of the outlet water of the SBR reactor multiplied by b + the ammonia nitrogen concentration of the inlet water of the middle water tank multiplied by b, wherein the range of b is 4-6;
s4: after sewage enters the SACR reactor from the middle water tank, anoxic stirring is firstly carried out, when the pH value is changed from rising to falling, the preposed denitrification in the SACR reactor is shown to be finished, then, T hours later, stirring is stopped, aeration nitrification is started, when the pH value in the SACR reactor is increased from falling to rising and DO is greatly increased, the nitrification in the SACR reactor is shown to be finished, at the moment, aeration is closed, stirring is continued, endogenous denitrification is started, the change of ORP in the SACR reactor is observed, when the ORP in the SACR reactor is rapidly reduced, the denitrification in the SACR reactor is shown to be finished, at the moment, stirring is closed, and water is precipitated and discharged.
2. The combined anaerobic-SBR-SACR process for the advanced denitrification of high ammonia nitrogen wastewater as claimed in claim 1, wherein T is in the range of 0 to 2.
3. The combined anaerobic-SBR-SACR advanced nitrogen removal process for high ammonia nitrogen wastewater as claimed in claim 1, wherein the carbon nitrogen ratio of the inlet water of the anaerobic reactor is more than 5: 1, the volume load of the anaerobic reactor is 4-8 k gCOD/m3Day.
4. The combined anaerobic-SBR-SACR advanced nitrogen removal process for high ammonia nitrogen wastewater as claimed in claim 1, wherein the sludge concentration of the SBR process is controlled to be 4000mg/L to 5000mg/L, the water discharge ratio is 25% to 30%, the water inlet time is 30 minutes, and the settling time is 60 minutes.
5. The anaerobic-SBR-SACR combined type high ammonia nitrogen sewage deep denitrification process as claimed in any one of claims 1 to 3, wherein the sludge concentration of the SACR process is controlled to be 5000mg/L to 8000mg/L, the drainage ratio is controlled to be 25% to 30%, the water inlet time is 30 to 60 minutes, and the precipitation time is 60 to 90 minutes.
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