CN112374690B - Synchronous denitrification method for high-salinity wastewater - Google Patents
Synchronous denitrification method for high-salinity wastewater Download PDFInfo
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- CN112374690B CN112374690B CN202011138515.XA CN202011138515A CN112374690B CN 112374690 B CN112374690 B CN 112374690B CN 202011138515 A CN202011138515 A CN 202011138515A CN 112374690 B CN112374690 B CN 112374690B
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/342—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the enzymes used
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a method for treating high-salinity wastewaterThe denitrification method comprises the step of carrying out denitrification by circularly flowing a mixed solution of water to be treated and biomass compound biological enzyme in a high-salinity wastewater synchronous denitrification processor, wherein the high-salinity wastewater synchronous denitrification processor is a completely mixed biochemical processor, and the dissolved oxygen in the mixed solution is controlled to be not less than 4mg/L in the denitrification process. The invention aims at the high organic matter high salt nitrogen-containing wastewater, and synchronously carries out the biochemical processes of carbonization, nitrification, denitrification, anaerobic ammonia oxidation and the like in the synchronous denitrification treatment process so as to lead CODcr and NH 3 The removal rate of-N and TN reaches more than 90 percent.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for treating high-salt nitrogen-containing wastewater.
Background
At present, the COD (chemical oxygen demand) can reach 1000mg/L, the salinity can reach 10000mg/L, and ammonia Nitrogen (NH) 3 -N) can reach 50-70 mg/L, total Nitrogen (TN) can reach 70-80 mg/L, the first choice process of treatment is anaerobic digestion + A/O process (anaerobic-aerobic process). The anaerobic digestion process greatly reduces the organic pollutant CODcr (COD measured by potassium dichromate), but the total nitrogen is hardly removed, so that the carbon source in the denitrification process of the subsequent denitrification process (A/O process) is insufficient to influence the denitrification effect. Meanwhile, the high-salinity wastewater is extremely unfavorable for the survival of microorganisms, and the removal rate of ammonia nitrogen cannot be ensured. Furthermore, the a/O process is typically a plug flow biochemical reactor, a fully mixed biochemical reactor, a circulating biochemical reactor, and variants thereof, all based on the principles of multi-biological enzymatic redox. In the biochemical process of the system, the organic carbon source must meet the requirement of carbon-nitrogen ratio, and the system has obvious regional division (an anoxic region A and an aerobic region O) and nitrification liquid reflux. Because of the activity of denitrifying bacteria and the limitation of nitrifying liquid reflux, the denitrification effect is not ideal, and the TN removal rate is less than 75 percent. As shown in FIG. 1, the relationship between the reflux ratio and TN is such that when the reflux ratio (the ratio of the reflux flow rate to the feed flow rate) is 200% to 400%, the removal rate of TN is the highest, but when the reflux ratio exceeds 400%, the residual dissolved oxygen in the nitrified liquid affects the activity of denitrifying bacteria. The reflux ratio is so large that the power consumption is large and the running cost is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a synchronous denitrification method for high-salinity wastewater.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a method for synchronously denitrifying high-salinity wastewater comprises the following steps: the method comprises the steps that mixed liquor of water to be treated and biomass composite biological enzyme circularly flows in a high-salinity wastewater synchronous denitrification processor for denitrification, the high-salinity wastewater synchronous denitrification processor is a completely mixed biochemical processor, and dissolved oxygen in the mixed liquor is controlled to be not less than 4mg/L in the denitrification process; the biomass composite biological enzyme is prepared by the following method: mixing corn and water according to the mass ratio of 1.
Furthermore, the adding amount of the biomass compound biological enzyme is 1-20 per thousand of the water amount to be treated, such as 1 per thousand, 2 per thousand, 2.5 per thousand, 3 per thousand, 5 per thousand, 10 per thousand, 15 per thousand, 20 per thousand and the like. If the water to be treated contains more pollutants, the dosage of the high-efficiency salt-tolerant biomass compound biological enzyme can be correspondingly increased.
Further, the dissolved oxygen in the mixed solution is controlled to be 4 to 10mg/L, for example, 4mg/L, 6mg/L, 8mg/L, 10mg/L, or the like in the denitrification process.
Further, the synchronous denitrification processor for the high-salinity wastewater comprises a tank body, wherein a plurality of jet flow aerators are arranged in the tank body; the mixed liquid is driven by the jet aerators to circularly flow in the tank body for denitrification, and the jet aerators are used for controlling dissolved oxygen in the mixed liquid.
Further, the cell body is U type, the corner of cell body is the arc.
Furthermore, a U-shaped partition plate is arranged in the tank body, the tank body is divided into a U-shaped external flow passage and a U-shaped internal flow passage by the partition plate, and the external flow passage is communicated with the internal flow passage to form a closed loop for circulating the mixed liquid.
Furthermore, a water inlet device and a water outlet device are arranged on the tank body; the water inlet device comprises a water inlet pipe and a water inlet pipe control valve; the water outlet device comprises a water outlet pipe and a water outlet pipe control valve.
Further, the synchronous denitrification processor for the high-salinity wastewater also comprises a fan and a circulating pump; the jet flow aerators are communicated with the fan; the jet aerators are communicated with the circulating pump. The circulation pump has an outlet pressure of, for example, 0.5 to 1.5kg/cm 2 The centrifugal pump of (1); the outlet pressure of the fan is, for example, 0.5 to 1.5kg/cm 2 。
Further, a DO instrument is further arranged in the tank body.
Furthermore, in the high-salinity wastewater aimed by the invention, COD is 800-1000 mg/L, and NH 3 N is 30-70 mg/L, total nitrogen is 35-80 mg/L, salt is 9000-10000 mg/L, and the wastewater is high organic matter and high salt wastewater.
Further, before the wastewater enters the high-salinity wastewater synchronous denitrification processor, the wastewater is subjected to primary treatment to remove large-particle suspended matters in the wastewater; then entering the high-salinity wastewater synchronous denitrification processor for denitrification treatment; and the mixed liquid after passing through the synchronous denitrification processor for the high-salinity wastewater enters a secondary sedimentation tank for mud-water separation, supernatant is discharged, one part of sludge flows back, and the other part of sludge is discharged into a sludge treatment system as residual sludge for treatment.
The invention relates to a high-salinity wastewater synchronous denitrification method (O/O mode) operation principle: the synchronous denitrification processor for high-salinity wastewater is a completely closed mixed reactor, namely a completely mixed biochemical reactor, and is characterized in that substances in the synchronous denitrification processor are in a completely mixed state, and an aerobic zone or an anaerobic zone and the like are not distinguished. The water flow circulates in a closed loop, and the circulating power comes from the jet aerator. One end of the tank body of the high-salinity wastewater synchronous denitrification processor is fed with water, sludge backflow also enters from the same end of the tank body, and after organic matter degradation and denitrification are carried out in the high-salinity wastewater synchronous denitrification processor, mixed liquid enters a secondary sedimentation tank for mud-water separation. The jet aerator is used for oxygenating the high-salinity wastewater synchronous denitrification processor, and simultaneously plays roles in mixing and plug flow, so that dissolved oxygen DO in the biochemical reactor is not lower than 4mg/L all the time, and the added high-efficiency salt-tolerant biomass compound biological enzyme is used for simultaneously carrying out biochemical processes such as carbonization, nitrification, denitrification, anaerobic ammonia oxidation and the like in the reactor.
C x H y O z +(x+y/4-z/2)O 2 →xCO 2 +y/2H 2 O
NH 4+ +2O 2 →2NO 3 - +2H + +H 2 O
NO 3 - +H + →N 2 +H 2 O
Except for specific description, the equipment, reagents, processes, parameters and the like related to the invention are conventional equipment, reagents, processes, parameters and the like, and are not implemented.
All ranges recited herein include all point values within the range.
Compared with the background technology, the technical scheme has the following advantages:
1. the synchronous denitrification method for the high-salinity wastewater is in an O/O mode, and is pertinently applied to the high-organic matter high-salinity nitrogen-containing wastewater.
2. In the synchronous denitrification treatment process, the biochemical processes of carbonization, nitrification, denitrification, anaerobic ammonia oxidation and the like are synchronously carried out, so that CODcr and NH are generated 3 The removal rate of-N and TN reaches more than 90 percent.
3. The corn fermentation product prepared by the invention contains high-efficiency salt-tolerant biomass composite biological enzyme, can still keep biological activity in a high-salt environment, can use ammonia nitrogen as a reducing agent, and can carry out denitrification with or without a carbon source. By adjusting and matching the high-efficiency salt-tolerant biomass composite biological enzyme and dissolved oxygen, the synchronous implementation of biochemical processes such as carbonization, nitrification and denitrification, anaerobic ammonia oxidation and the like is realized, and organic matters and nitrogen in water are treated simultaneously.
4. The synchronous denitrification processor for the high-salinity wastewater provided by the invention has a completely mixed tank body, the tank body is not partitioned and has no dead angle, the plug flow is good, a good flow state can be formed, the stirring and the mixing are uniform, and the denitrification effect is ensured.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a schematic diagram showing the relationship between the reflux ratio and TN in the A/O process of the prior art.
FIG. 2 is a schematic view of a wastewater treatment overall flow of the synchronous denitrification method for high-salinity wastewater according to the embodiment of the invention.
FIG. 3 is a schematic view of the apparatus used in the simultaneous denitrification method (O/O mode) for high-salinity wastewater according to the embodiment of the present invention.
FIG. 4 is a process flow diagram of a high-salinity wastewater simultaneous denitrification method (O/O mode) according to an embodiment of the present invention.
Reference numerals are as follows:
the device comprises a tank body 1, a water inlet device 2, a jet aerator 3, a circulating pump 4, a fan 5, a partition plate 6, a water outlet device 7, a DO instrument 8, a primary treatment 9 and a secondary sedimentation tank 10.
Detailed Description
The present invention will be described in detail with reference to the following examples:
examples
The method for synchronously denitrifying high-salinity wastewater (O/O mode) in the embodiment has a general flow path as shown in FIG. 2, and comprises the following steps: the raw water is subjected to primary treatment 9 to remove large-particle suspended matters in the sewage; then entering a synchronous denitrification processor for high-salinity wastewater to carry out biochemical treatment; the mixed liquid after passing through the high-salinity wastewater synchronous denitrification processor enters a secondary sedimentation tank 10 for sludge-water separation, supernatant liquid is discharged, one part of sludge flows back, and the other part of sludge is discharged into a sludge treatment system as residual sludge for treatment.
Wherein, the key step is the biochemical treatment in the synchronous denitrification treater of the high-salinity wastewater.
The synchronous denitrification processor for high-salinity wastewater is a closed complete-mixing biochemical device, and comprises a tank body 1, a water inlet device 2, a water outlet device 7, a plurality of jet aerators 3, a fan 5, a circulating pump 4 and a DO (dissolved oxygen) meter 8, as shown in figure 3.
The tank body 1 is approximately U-shaped, each corner of the tank body 1 is arc-shaped, and no dead angle is generated when the mixed liquid flows; the tank body 1 is internally provided with a U-shaped clapboard 6, the tank body 1 is divided into a U-shaped external flow passage and a U-shaped internal flow passage by the clapboard 6, and the external flow passage is communicated with the internal flow passage to form a closed loop for the circulation and the flow of the mixed liquid. The tank body 1 is the main body of the high-salinity wastewater synchronous denitrification processor, and the baffle 6 plays a role in guiding flow in the tank body 1, so that the mixed liquid can circularly flow in the tank body 1 without dead angles.
The tank body 1 is provided with a water inlet device 2 and a water outlet device 7. The water inlet device 2 comprises a water inlet pipe and a water inlet pipe control valve and is used for controlling the water inlet and the water inlet amount into the tank body, and raw water enters the tank body 1 through the water inlet device 2 after being subjected to primary treatment 9; the water inlet device 2 and the sludge reflux are both positioned at the same end of the tank body 1. The water outlet device 7 comprises a water outlet pipe and a water outlet pipe control valve, and is used for outflow of mixed liquid in the tank body 1 and liquid level control of the high-salinity wastewater synchronous denitrification processor, and the mixed liquid passing through the high-salinity wastewater synchronous denitrification processor enters the secondary sedimentation tank 10 through the water outlet device 7; the water inlet device 2 and the water outlet device 7 can also be arranged at the same end of the tank body 1.
A plurality of jet flow aerators 3 are also arranged in the tank body 1, the jet flow aerators 3 are dispersedly arranged in the tank body 1, and the jet flow and aeration directions are consistent with the flowing direction of the mixed liquid, so that the mixed liquid is provided with circulating power. The jet aerator 3 is used for oxygenating in the high-salinity wastewater synchronous denitrification processor and simultaneously has the functions of mixing and plug flow. The jet aerator 3 is communicated with a fan 5 and a circulating pump 4; the water used by the jet aerator 3 is provided by a circulating pump 4, and the outlet pressure of the circulating pump 4 is 1kg/cm 2 Left and right centrifugal pumps; the air used by the jet aerator 3 is provided by a fan 5, and the outlet pressure of the fan 5 is 1kg/cm 2 Left and right. The jet aerator 3 may be a commercially available product.
A DO instrument 8 is also arranged in the tank body 1 and is used for detecting the dissolved oxygen of the mixed liquid in the synchronous denitrification processor for the high-salinity wastewater.
The specific method for performing biochemical treatment in the synchronous denitrification processor for high-salinity wastewater is shown in fig. 4, and comprises the following steps:
adding high-efficiency salt-tolerant biomass compound biological enzyme into water to be treated in the tank body 1, starting a plurality of jet flow aerators 3, enabling mixed liquid formed by the water and the high-efficiency salt-tolerant biomass compound biological enzyme to circularly flow in the tank body 1 for denitrification, and enabling dissolved oxygen in the mixed liquid to be not less than 4mg/L in the denitrification process.
The efficient salt-tolerant biomass compound biological enzyme is prepared by the following method: mixing corn and water according to the mass ratio of 1. Directly adding the waste water into a synchronous denitrification processor for high-salinity waste water.
Examples of the experiments
The high-salinity wastewater synchronous denitrification method (O/O mode) of the embodiment is applied to treat wastewater of a certain electroplating plant, the COD is 800-1000 mg/L, and the NH content is 3 N is 30-40 mg/L, total nitrogen is 35-45 mg/L, and salt content is 9000-10000 mg/L.
Raw water enters a high-salinity wastewater synchronous denitrification processor after primary treatment, the treated water amount is 100t/d, high-efficiency salt-tolerant biomass compound bio-enzyme is added into the high-salinity wastewater synchronous denitrification processor, the adding amount of the high-efficiency salt-tolerant biomass compound bio-enzyme is 2.5 per mill of the treated water amount, dissolved oxygen in water is controlled to be above 4mg/L all the time, the reaction time is 10 hours, the removal rate of ammonia nitrogen in effluent reaches 92 percent, and the removal rate of NO is 100 percent 3 -N removal rate>98 percent and the COD removal rate is 90 percent.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.
Claims (6)
1. A synchronous denitrification method for high-salinity wastewater is characterized by comprising the following steps: the method comprises the following steps: the method comprises the steps that mixed liquor of water to be treated and biomass composite biological enzyme circularly flows in a high-salinity wastewater synchronous denitrification processor for denitrification, the high-salinity wastewater synchronous denitrification processor is a completely mixed biochemical processor, and dissolved oxygen in the mixed liquor is controlled to be not less than 4mg/L in the denitrification process; the biomass composite biological enzyme is prepared by the following method: mixing corn and water according to the mass ratio of 1;
controlling the dissolved oxygen in the mixed solution to be 4-10 mg/L in the denitrification process;
the high-salinity wastewater synchronous denitrification processor comprises a tank body, wherein a plurality of jet flow aerators are arranged in the tank body; the mixed liquid circularly flows in the tank body under the drive of the jet aerators for denitrification, and the jet aerators control the dissolved oxygen in the mixed liquid;
the tank body is U-shaped, and corners of the tank body are arc-shaped; a U-shaped partition plate is arranged in the tank body, the tank body is divided into a U-shaped external flow passage and a U-shaped internal flow passage through the partition plate, and the external flow passage is communicated with the internal flow passage;
the adding amount of the biomass compound biological enzyme is 1-20 per mill of the water amount to be treated.
2. The method for synchronously denitrifying high-salinity wastewater according to claim 1, wherein: a water inlet device and a water outlet device are arranged on the tank body; the water inlet device comprises a water inlet pipe and a water inlet pipe control valve; the water outlet device comprises a water outlet pipe and a water outlet pipe control valve.
3. The method for synchronously denitrifying high-salinity wastewater according to claim 1, wherein: the high-salinity wastewater synchronous denitrification processor also comprises a fan and a circulating pump; the jet flow aerators are communicated with the fan; the jet aerators are communicated with the circulating pump.
4. The method for synchronously denitrifying high-salinity wastewater according to claim 1, wherein: and a DO instrument is also arranged in the tank body.
5. The method for synchronously denitrifying high-salinity wastewater according to claim 1, wherein: in the high-salinity wastewater, COD is 800-1000 mg/L, NH3-N is 30-70 mg/L, total nitrogen is 35-80 mg/L, and salinity is 9000-10000 mg/L.
6. The method for synchronously denitrifying high-salinity wastewater according to claim 1, wherein: before the wastewater enters the high-salinity wastewater synchronous denitrification processor, large-particle suspended matters in the wastewater are removed through primary treatment; then the wastewater enters the high-salinity wastewater synchronous denitrification processor for denitrification treatment; and the mixed liquid passing through the synchronous denitrification processor for the high-salinity wastewater enters a secondary sedimentation tank for mud-water separation, supernatant is discharged, one part of sludge flows back, and the other part of sludge is used as residual sludge.
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