CN112939222A - System and method for treating wastewater by virtue of stirring type single-stage synergistic denitrification - Google Patents
System and method for treating wastewater by virtue of stirring type single-stage synergistic denitrification Download PDFInfo
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- 238000005191 phase separation Methods 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 22
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 17
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- 239000000843 powder Substances 0.000 claims abstract description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 6
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
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- 238000010992 reflux Methods 0.000 abstract description 22
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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
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/91—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with propellers
-
- 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
-
- 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
- C02F2209/15—N03-N
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- Chemical & Material Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a system for treating wastewater by stirring type single-stage synergetic denitrification nitrogen removal, which comprises a reactor, wherein the reactor comprises a water inlet area, a supporting layer, an autotrophic denitrification filler layer, a heterotrophic denitrification filler layer, a three-phase separation area, an overflow weir and an exhaust hole from bottom to top in sequence; the water inlet area is connected with a wastewater inlet pipe, a backwashing water pump and a backwashing air pump; a stirring device is arranged in the cavity. The autotrophic denitrification filler layer is arranged above the bearing layer, and the filler is a mixture of elemental sulfur particles and carbonate particles or composite particles formed by elemental sulfur and carbonate powder; the heterotrophic denitrification filler layer is arranged above the autotrophic denitrification filler layer, and the filler is particles or corncob fragments made of organic plant powder; overflow weirs with the same height are arranged on two sides of the three-phase separation area, and a water outlet or a reflux port is correspondingly arranged at the positions of the overflow weirs. The sulfur-based-wood synergetic autotrophic and heterotrophic denitrification system has low carbon source cost, can reduce nitrate nitrogen and sulfate radicals in water, and improves the shock resistance of the reactor by the stirring device.
Description
Technical Field
The invention relates to a wastewater treatment system and a wastewater treatment method, in particular to a system and a method for treating wastewater by stirring type single-stage synergetic denitrification.
Background
The pollution of nitrogen sources formed by chemical fertilizers, pesticides, sewage irrigation and the like causes that underground water in many areas is polluted by nitrate nitrogen salts with different degrees, the nitrate nitrogen salts can cause methemoglobinemia and induce various cancers, and the pollution has adverse effects on human vascular nerves and cardiovascular systems in larger dosage. The commonly used nitrate nitrogen salt removal technology at present comprises a physical treatment technology, a chemical treatment technology and a biological treatment technology. Physical and chemical technologies have the problems of high cost, high energy consumption, generation of concentrated solution, secondary pollution and the like although the reaction is fast, and are not suitable for large-scale application.
The biological treatment technology has the characteristics of less sludge production, stable water outlet, low energy consumption and the like, is particularly suitable for treating sewage with low C/N ratio, and is divided into autotrophic denitrification and heterotrophic denitrification according to different required carbon sources. The heterotrophic denitrification needs an additional carbon source, and the reaction rate is high; and the autotrophic denitrification has the advantages of less sludge production, low energy consumption and the like. In summary, the denitrification by microorganisms has a great prospect, but the existing systems and methods for synergistically utilizing the autotrophic denitrification and the heterotrophic denitrification of microorganisms are not many. In order to further realize the recycling of sewage, an economic and efficient denitrification method is urgently needed to be researched and developed.
Disclosure of Invention
Technical problem to be solved
In view of the defects and shortcomings of the prior art, the invention provides a system for treating wastewater by using a stirring type single-stage synergistic denitrification process, which has the characteristics of low energy consumption, convenience in use, small occupied area and the like, and can be directly integrated into a treatment facility of the existing sewage treatment plant to carry out deep denitrification treatment on wastewater. The invention also relates to a method for treating wastewater by using the system.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, the present invention provides a system for wastewater treatment by stirred single-stage synergetic denitrification, comprising:
the reactor comprises a water inlet area, a bearing layer, an autotrophic denitrification filler layer, a heterotrophic denitrification filler layer, a three-phase separation area and an overflow weir from bottom to top in sequence, and an exhaust hole is formed in the top of the reactor;
wherein, the water inlet area is internally provided with a cavity and is provided with a wastewater inlet, a backwashing water inlet and an air inlet; the wastewater inlet is connected with a wastewater inlet pipe, the backwashing water inlet is connected with a backwashing water pump, and the air inlet is connected with a backwashing air pump; a stirring device is arranged in the cavity;
the autotrophic denitrification filler layer is arranged above the bearing layer, and the bearing layer is made of a water-permeable material; the filler in the autotrophic denitrification filler layer is a mixture of elemental sulfur particles and carbonate particles, or is composite particles formed by loading elemental sulfur on carbonate powder and then pelleting;
the heterotrophic denitrification filler layer is arranged above the autotrophic denitrification filler layer, and the filler in the heterotrophic denitrification filler layer is particles or broken blocks of corncobs made of organic plant powder;
the filler mass ratio of the autotrophic denitrification filler layer to the heterotrophic denitrification filler layer is 10: 1-1: 10;
overflow weirs with equal height are arranged on two sides of the three-phase separation zone, a water outlet is correspondingly arranged at the overflow weir on one side, and a backflow port is correspondingly arranged at the overflow weir on the other side; the water outlet is used for discharging the water quality meeting the preset discharge standard, the backflow port is used for returning the water which does not meet the preset discharge standard to the water inlet area so as to dilute and regulate the wastewater entering the water inlet area, and then the wastewater is subjected to autotrophic denitrification and heterotrophic denitrification treatment again, wherein the backflow ratio is set to be 100-300%.
The three-phase separator is used for separating solid sludge, clear water and nitrogen.
Preferably, the reflux ratio is set to 100% to 300%.
According to the preferred embodiment of the invention, in the autotrophic denitrification filler layer, the size of the filler particles is 1-15cm3(ii) a In the heterotrophic denitrification filler layer, the size of filler particles is 1-20cm3. Preferably, the filler particles in the autotrophic denitrification filler layer are filled in a continuous grading manner, and the filler particles in the heterotrophic denitrification filler layer are filled in a continuous grading manner.
According to the preferred embodiment of the present invention, wherein the stirring device comprises a variable frequency motor, a worm wheel and a helical blade; the variable frequency motor is arranged on the outer side wall of the water inlet area and can drive the worm to rotate, and the worm penetrates through the side wall of the water inlet area to enter the cavity and is meshed with the worm wheel; the helical blade is connected with the worm wheel through a connecting shaft; the number of the spiral blades is more than two.
Preferably, the number of the variable frequency motors is 2 or 2, the variable frequency motors are arranged on the outer side wall of the water inlet area and are arranged for one or more than one. Preferably, the driving main shaft of the variable frequency motor is vertical to the connecting shaft of the helical blade.
According to the preferred embodiment of the present invention, the wastewater inlet and the backwash water inlet of the water inlet area and the air inlet are located on the side walls of the water inlet area on different sides.
According to the preferred embodiment of the present invention, the supporting layer is formed by stacking pebbles or zeolites with a diameter of 0.5-5 cm; preferably in a continuous graded packing to reduce porosity and avoid loss of the filler supported thereon. The reactor is cylindrical or square column-shaped, and the height-diameter ratio is 1-15: 1.
According to the preferred embodiment of the present invention, the cross section of the overflow weir is L-shaped, one end of the bottom of the overflow weir is connected with the side wall of the three-phase separation zone, the top of the overflow weir forms an overflow edge, and the parts of the overflow weir located below the overflow edge are connected with the side wall of the three-phase separation zone, so that water can only pass through the overflow edge and then be led out of the reactor through the water outlet or the return port.
According to the preferred embodiment of the invention, in the reactor, the volume ratio of the water inlet area, the supporting layer, the autotrophic denitrification filler layer, the heterotrophic denitrification filler layer and the three-phase separation area is 1:0.2-0.5:4-10: 1-2.
According to the preferred embodiment of the invention, at least 3 sampling ports are arranged at equal intervals according to the total height of the autotrophic denitrification filler layer and the heterotrophic denitrification filler layer, and are used for sampling and detecting the water quality, including detecting the concentration of nitrate nitrogen and the concentration of sulfate radical in the water.
According to the preferred embodiment of the present invention, a filler feeding port is provided on the side wall of the reactor corresponding to the autotrophic denitrification filler layer or the heterotrophic denitrification filler layer, and the filler feeding port can be opened or closed, and after the filler feeding port is closed, the reactor can be sealed to prevent sewage from flowing out.
According to the preferred embodiment of the invention, a differential pressure sensor is connected between the autotrophic denitrification filler layer and the heterotrophic denitrification filler layer, and the blockage condition of the filler is judged by the differential pressure sensor to determine whether the backwashing water pump and the backwashing air pump are required to be started for flushing.
According to the preferred embodiment of the present invention, the reflux port is connected to the reflux pipe and the reflux pump, and the reflux pipe is connected to the wastewater inlet pipe, and after being mixed with the wastewater inlet pipe, the mixture enters the water inlet area, and after being uniformly mixed by the stirring device in the water inlet area, the denitrification treatment is performed.
According to the preferred embodiment of the invention, the wastewater treatment device further comprises a wastewater collection tank, after wastewater is collected in the wastewater collection tank, subjected to pH adjustment and clarification, supernatant is pressurized by a water inlet pump and is introduced into a water inlet area through a wastewater inlet pipe.
In a second aspect, the invention also provides a method for treating wastewater by using the system of any one of the above embodiments.
The reactor is made of organic glass or glass fiber reinforced plastic.
The system operates as follows: the wastewater enters a water inlet area, the water level rises and sequentially passes through a bearing layer, an autotrophic denitrification packing layer and a heterotrophic denitrification packing layer, denitrification reaction is carried out on the wastewater and autotrophic/heterotrophic wastewater during passing through the packing layers, nitrate nitrogen salt in the wastewater is converted into nitrogen, the treated wastewater flows out of a water outlet and is collected through a three-phase separation area and an overflow weir, and the generated nitrogen is discharged through an exhaust hole at the top. If the effluent quality is not qualified, the effluent is pressurized by a reflux pump through a reflux port at the overflow weir and flows back to a water inlet area at the bottom of the reactor to ensure the water quality. After the reactor runs for a long period, if the monitoring value of the differential pressure sensor is greater than a certain preset value, the inside of the reactor is backwashed through a backwash water pump or a backwash device air pump at the bottom of the reactor. When the water inlet load is higher, the stirring device can be operated in good time under the condition that the backflow cannot meet the requirement of the water quality of the outlet water, the denitrification load of the reactor is improved, the dead zone area of the reactor is reduced, the water quality of the outlet water is prevented from exceeding the standard, and the water quality of the whole outlet water is improved.
(III) advantageous effects
The invention has the beneficial effects that: (1) the treatment system is a synergic denitrification system, organic reagents are not required to be added, the cost of the used carbon source (the carbon source is corn cob and other crop wastes) is low, the process operation cost is reduced, and the sulfate radicals in the effluent are reduced; (2) the adopted granular filler can effectively improve the water quality of the effluent and reduce the entrainment of impurities; (3) the operation is convenient, and the use of the stirring device improves the treatment capacity of the reactor and enhances the shock resistance; (4) the use of the synergetic heterotrophic/autotrophic denitrification can reduce the sludge yield compared with the simple heterotrophic denitrification and reduce the sulfate radical yield compared with the simple autotrophic denitrification, and is beneficial to improving the effluent quality. (5) The heterotrophic denitrification filler layer is arranged above the autotrophic denitrification filler layer, and the heterotrophic filler is organic plant particles and has the functions of barrier retention and adsorption, so that the autotrophic denitrification filler can be more fully retained in the reactor and utilized, and the denitrification utilization efficiency of the autotrophic filler is improved.
Drawings
FIG. 1 is a schematic view of a stirred single-stage denitrification system according to a preferred embodiment of the present invention.
Description of the symbols:
1. the device comprises a wastewater collecting pool, 2, a wastewater collecting pipe, 3, a wastewater inlet pump, 31, a wastewater inlet pipe, 4, a reflux pump, 5, an exhaust hole, 41, a reflux port, 42, a reflux pipe, 6, a water outlet, 7, an overflow weir, 8, a three-phase separation zone, 9, a filler feeding port, 10, a heterotrophic denitrification filler layer, 11, a sampling port, 12, a differential pressure sensor, 13, a bearing layer, 14, an autotrophic denitrification filler layer, 15, a worm, 16, a variable frequency motor, 17, a worm gear, 18, helical blades, 19, a connecting shaft, 20, a water inlet zone, 21, a backwashing air pump, 22 and a backwashing water pump.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
As shown in figure 1, the novel stirring type single-stage synergistic denitrification and denitrification wastewater treatment system provided by the invention is a cylindrical reactor, the height-diameter ratio of the reactor is 4.2:1, and the reactor sequentially comprises a water inlet area 20, a supporting layer 13, an autotrophic denitrification filler layer 14, a heterotrophic denitrification filler layer 10, a three-phase separation area 8, an overflow weir 7 and an exhaust hole 5 from bottom to top. A water inlet is arranged on one side wall of the water inlet area 20, and the wastewater in the wastewater collecting tank 1 is sent into the reactor after being boosted by the wastewater inlet pump 3 and the wastewater inlet pipe 31. Factory's exhaust waste water gets into waste water collecting pit 1 by waste water collecting pipe 2 in, through pH regulation and clarification back, the supernatant is through the intake pump pressurization, lets in into water district 20 through waste water inlet tube 31. The water flow sequentially passes through the supporting layer 13, the autotrophic denitrification filler layer 14 and the heterotrophic denitrification filler layer 10 and then enters the three-phase separation region 8, and enters the water outlet 6 or the return port 41 through the overflow weir 7 in the three-phase separation region 8. A nitrate nitrogen monitoring sensor is arranged in the three-phase separation area 8 to detect the water quality in the three-phase separation area 8, when the water quality reaches a preset discharge standard, a valve of the water outlet 6 is started to be opened to discharge the water, or when the water quality in the three-phase separation area 8 does not reach the discharge standard, a valve of the return port 41 and the return pump 4 are started.
After the reactor runs for a long period, if the value of the differential pressure sensor 12 of the reactor is large, the water pump 22 or the reverse flushing water pump is back-flushed through the bottom of the reactorThe reactor is backwashed by a flusher air pump 21. The support layer 13 consists of a 0.5cm zeolite packing. The autotrophic denitrification filler layer 14 is filled with elemental sulfur and oyster shell powder mixed in a mass ratio of 2:1, and the elemental sulfur and oyster shell powder are bonded and dried by adhesives such as CMC and the like to prepare particles with the particle size of about 1cm3. The filling particle size of the heterotrophic denitrification filler layer 10 is about 2cm3And (4) filling corncobs. The volume ratio of the water inlet area 20, the supporting layer 13, the filler layer (autotrophic denitrification + heterotrophic denitrification) and the three-phase separation area 8 is 1:0.3:7.7: 2. One side wall of the packing layer (autotrophic denitrification and heterotrophic denitrification) is provided with three sampling ports 11 which are arranged at equal intervals, at least one sampling port is arranged in an autotrophic denitrification packing area 14, and at least one sampling port is arranged in a heterotrophic denitrification packing area 10 and is used for sampling water quality and detecting the change of nitrogen concentration and the change of sulfate concentration in the water quality. The upper part of the packing layer is provided with a packing feed inlet 9, and the other side wall of the packing layer is provided with a differential pressure sensor 12 for monitoring the blocking condition of the reactor. Two overflow weirs 7 are symmetrically arranged at the upper part of the three-phase separation area 8, the cross section of each overflow weir 7 is L-shaped, one end of the bottom of each overflow weir is connected with the side wall of the three-phase separation area 8, and the top of each overflow weir forms an overflow edge. The part of the overflow weir 7 below the overflow edge is connected with the side wall of the three-phase separation zone 8 in a closed way, so that water can only pass through the overflow edge and then is led out of the reactor through the water outlet 6 or the return port 41 outside the overflow weir 7. And after sequentially passing through the water inlet area 20, the supporting layer 13, the autotrophic denitrification packing layer 14, the heterotrophic denitrification packing layer 10, the three-phase separation area 8 and the overflow weir 7 from bottom to top, the sewage is discharged through the water outlet pipe 6. When the water quality does not reach the discharge standard, the pressure is increased through the return port 41 on one side by the return pump 4, and the water is sent to the wastewater inlet pipe 31 through the return pipe 42 to realize the return, wherein the return ratio is 100-300%. An exhaust vent 5 is located at the top of the reactor for venting nitrogen produced by denitrification. When the water inlet load is higher, the stirring device is operated, the variable frequency motor 16 drives the worm 15 to rotate, so that the worm wheel 17 and the helical blade 18 are driven to rotate, and the integral water outlet quality is improved.
According to the structure, a small reactor for a laboratory is designed, the height-diameter ratio of the small reactor is 4.2:1, the effective volume is 11L, the height of a water inlet area is 10cm, the height of a supporting layer 13 is 3cm, the filling height of an autotrophic denitrification filler layer 14 is 30cm, the filling height of a heterotrophic denitrification filler layer 10 is 47cm, and the height of a three-phase separation area 8 is 20 cm. This mini-reactor was used in the following examples.
Example 1
In this example 1, the present invention provides a novel stirring type single-stage synergetic denitrification method for wastewater treatment, wherein the effective volume of the reactor is 11L, the aspect ratio is 4.2: 1.
comparative example 1 is a conventional upflow reactor, with a reactor effective volume of 11L, a height to diameter ratio of 4: 1. comparative example 2 is a conventional upflow reactor, with a reactor effective volume of 11L, a height to diameter ratio of 7: 1.
example 1 an autotrophic section was filled with 7kg of sulfur autotrophic denitrification filler (particulate matter of elemental sulfur and oyster shell powder bonded and dried by CMC or other binder, particle size about 1cm3) Filling 2cm in the heterotrophic section37kg of corn cob filler. In example 1, no reflux was carried out.
Comparative examples 1 and 2 were each charged with 14kg of sulfur autotrophic denitrification filler, and the three reactors were operated under the same conditions. The sewage source is inoculated by adopting activated sludge of a secondary sedimentation tank from a sewage treatment plant, synthetic wastewater with the nitrate nitrogen concentration of about 30mg/L prepared by using a sodium nitrate medicament is introduced to carry out reactor internal circulation for reactor domestication, the synthetic wastewater with the nitrate nitrogen concentration of 30mg/L is continuously introduced after three days of internal circulation, and the removal effect of the nitrate nitrogen is periodically monitored under different hydraulic retention time. The results are shown in Table 1.
TABLE 1
| Parameter(s) | Example 1 | Comparative example 1 | Comparative example 2 |
| Concentration of nitrate nitrogen in influent water | 30mg/L | 30mg/L | 30mg/L |
| The average effluent nitrate nitrogen concentration of the hydraulic retention time of 8 hours | ＜1 | ＜1 | ＜1 |
| The average effluent nitrate nitrogen concentration of the hydraulic retention time of 6 hours | ＜1 | 2.3 | ＜1 |
| The average effluent nitrate nitrogen concentration of 3 hours of hydraulic retention time | ＜1 | 6.5 | ＜1 |
| Average outlet water sulfate radical concentration of 3 hours of hydraulic retention time | 219 | 242 | 286.2 |
The experimental results are shown in table 1, and it can be seen that in the case of the fastest hydraulic retention time of 3h, although example 1 and comparative example 2 have similar results in removing nitrate nitrogen, the sulfate radical concentration in comparative example 2 is higher, and the sulfate radical content in example 1 is lower, which shows that the wastewater treatment system of the invention is more helpful for reducing the sulfate radical concentration and has better effluent quality on the basis of ensuring the removal effect of nitrate nitrogen.
Examples 2 to 4
Example 2 is the novel method of treating wastewater by using the agitation type single-stage combined denitrification in example 1, and the reflux ratio is set to 100%.
Example 3 is the novel method of treating wastewater by using a single-stage stirring type combined denitrification as in example 1, and the reflux ratio is set to 200%.
Example 4 is the novel method of treating wastewater by using a single-stage stirring type combined denitrification as in example 1, and the reflux ratio is set to 300%.
The above examples 2-4 did not turn on the stirring device.
Example 1, example 2, example 3 and example 4 were carried out by filling 7kg of sulfur autotrophic denitrification nitrogen removal filler in the autotrophic zone and 2cm of sulfur autotrophic denitrification nitrogen removal filler in the heterotrophic zone37kg of corn cob filler. The four reactors are operated under the same condition, activated sludge of a secondary sedimentation tank from a sewage treatment plant is adopted for inoculation, synthetic wastewater with nitrate nitrogen concentration of about 30mg/L prepared by using a sodium nitrate medicament is introduced for reactor internal circulation for reactor domestication, synthetic wastewater with nitrate nitrogen concentration of 50mg/L is continuously introduced after three days of internal circulation, and the removal effect of nitrate nitrogen is regularly monitored under different hydraulic retention time. The results are shown in Table 2.
TABLE 2
| Parameter(s) | Example 1 | Example 2 | Example 3 | Example 4 |
| Concentration of nitrate nitrogen in influent water | 50mg/L | 50mg/L | 50mg/L | 50mg/L |
| The average effluent nitrate nitrogen concentration of 3 hours of hydraulic retention time | 9.1 | 6.5 | 2.6 | 4.6 |
| The average effluent nitrate nitrogen concentration of the hydraulic retention time of 2 hours | 26.7 | 20.5 | 16.5 | 22.3 |
| Average outlet water sulfate radical concentration of 3 hours of hydraulic retention time | 308.3 | 315.3 | 325.3 | 330.5 |
| Average outlet water sulfate radical concentration of 2 hours of hydraulic retention time | 215.3 | 225.6 | 219.6 | 229.3 |
As shown in table 2, it can be seen that the wastewater treatment system of the present invention has a certain improvement in the removal effect of nitrate nitrogen when the reflux is performed, compared to the case without the reflux, and also has the best effect when the reflux is 200%, indicating that the magnitude of the reflux ratio is not positively correlated to the removal effect of nitrate nitrogen. Compared with the pure sulfur autotrophic denitrification, the novel stirring type single-stage synergistic denitrification wastewater treatment method obtains a result lower than the theoretical sulfate radical yield under different conditions, and shows that the implementation of synergistic denitrification is helpful for the effluent quality.
Examples 5 to 7
In example 5, the stirring apparatus was started at a stirring speed of 5r/s while the reflux ratio was set to 200% in addition to example 3.
In example 6, the stirring apparatus was started at a stirring speed of 10r/s while the reflux ratio was set to 200% in addition to example 3.
In example 7, the stirring apparatus was started at a stirring speed of 20r/s while the reflux ratio was set to 200% in addition to example 3.
Example 3, example 5, example 6 and example 7 were carried out by filling 7kg of sulfur autotrophic denitrification nitrogen removal filler in the autotrophic zone and 2cm of sulfur autotrophic denitrification nitrogen removal filler in the heterotrophic zone, respectively37kg of corn cob filler. The three reactors are operated under the same condition, activated sludge of a secondary sedimentation tank from a sewage treatment plant is adopted for inoculation, synthetic wastewater with nitrate nitrogen concentration of about 30mg/L prepared by using a sodium nitrate medicament is introduced for reactor internal circulation for reactor domestication, the synthetic wastewater with nitrate nitrogen concentration of 50mg/L is continuously introduced after three days of internal circulation, and the removal effect of nitrate nitrogen is periodically monitored under different hydraulic retention time. The results are shown in Table 3.
TABLE 3
The experimental results are shown in table 3, and it can be seen that, in the case of 200% backflow, the stirring device is started simultaneously to improve the denitrification effect at different rotation speeds, which indicates that the quality of the effluent can be improved by using the stirring device. Meanwhile, a good effect is obtained under the condition of the embodiment 6, which shows that the stirring device has beneficial effects of improving the effluent quality, improving the dead zone environment of the reactor, stabilizing the influent water quality and enhancing the solubility of the solid-phase filler (autotrophic denitrification filler), and the rotating speed of the stirring device can economically ensure the effluent quality to be stable within a certain range, thereby being beneficial to the reactor to deal with the adverse effect caused by temporary fluctuation and improving the impact resistance of the reactor.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a system for stirring formula single-stage is denitrification denitrogenation in coordination handles waste water which characterized in that has:
the reactor comprises a water inlet area, a bearing layer, an autotrophic denitrification filler layer, a heterotrophic denitrification filler layer, a three-phase separation area and an overflow weir from bottom to top in sequence, and an exhaust hole is formed in the top of the reactor;
wherein, the inside of the water inlet area is a cavity and is connected with a wastewater inlet pipe and a backwashing water device; a stirring device is arranged in the cavity; the backwashing device comprises a backwashing water pump and a backwashing air pump;
the autotrophic denitrification filler layer is arranged above the bearing layer, and the bearing layer is made of a water-permeable material; the filler in the autotrophic denitrification filler layer is a mixture of elemental sulfur particles and carbonate particles, or is composite particles formed by loading elemental sulfur on carbonate powder and then pelleting;
the heterotrophic denitrification filler layer is arranged above the autotrophic denitrification filler layer, and the filler in the heterotrophic denitrification filler layer is particles or broken blocks of corncobs made of organic plant powder;
the filler mass ratio of the autotrophic denitrification filler layer to the heterotrophic denitrification filler layer is 10: 1-1: 10;
overflow weirs with equal height are arranged on two sides of the three-phase separation zone, a water outlet is correspondingly arranged at the overflow weir on one side, and a backflow port is correspondingly arranged at the overflow weir on the other side; the water outlet is used for discharging water quality reaching a preset discharge standard; the backflow port is used for returning water which does not reach the preset discharge standard to the water inlet area so as to dilute and adjust the wastewater entering the water inlet area, and then the wastewater is subjected to autotrophic denitrification and heterotrophic denitrification treatment again, wherein the backflow ratio is set to be 100 plus one of 300%.
2. The system of claim 1, wherein the autotrophic denitrification filler layer has a filler particle size of 1-15cm3(ii) a In the heterotrophic denitrification filler layer, the size of filler particles is 1-20cm3。
3. The system of claim 2, wherein the autotrophic denitrification filler layer is filled with continuous graded filler particles, and the heterotrophic denitrification filler layer is filled with continuous graded filler particles.
4. The system of claim 1, wherein the stirring device comprises a variable frequency motor, a worm gear, and a helical blade; the variable frequency motor is arranged on the outer side wall of the water inlet area and can drive the worm to rotate, and the worm penetrates through the side wall of the water inlet area to enter the cavity and is meshed with the worm wheel; the helical blade is connected with the worm wheel through a connecting shaft; the number of the spiral blades is more than two.
5. The system of claim 1, wherein the supporting layer is composed of a pebble or zeolite pile with a diameter of 0.5-5 cm.
6. The system of claim 1, wherein the weir has an L-shaped cross-section, a bottom end connected to the sidewall of the three-phase separation zone and a top end forming an overflow edge, and the portions of the weir below the overflow edge are connected to the sidewall of the three-phase separation zone such that water can only pass over the overflow edge and be directed out of the reactor through the water outlet or the water return port.
7. The system of claim 1, wherein the volume ratio of the water inlet zone, the supporting layer, the autotrophic denitrification filler layer, the heterotrophic denitrification filler layer and the three-phase separation zone in the reactor is 1:0.2-0.5:4-10: 1-2.
8. The system of claim 1, wherein at least 3 sampling ports are arranged at equal intervals according to the total height of the autotrophic denitrification filler layer and the heterotrophic denitrification filler layer, and are used for sampling and detecting the water quality, including detecting the nitrate nitrogen concentration and the sulfate radical concentration in the water.
9. The system of claim 2, wherein a differential pressure sensor is connected between the autotrophic denitrification filler layer and the heterotrophic denitrification filler layer, and the blockage condition of the filler is judged by the differential pressure sensor to determine whether the backwashing water pump and the backwashing air pump are required to be started for flushing.
10. A method for wastewater treatment by stirred single-stage synergetic denitrification with denitrification, which employs the system of any one of claims 1-9.
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| CN114772720A (en) * | 2022-03-25 | 2022-07-22 | 中电环保股份有限公司 | Upflow bioreactor based on sulfur autotrophic UAD and backwashing method |
| CN115367871A (en) * | 2022-09-01 | 2022-11-22 | 哈尔滨工业大学（深圳） | Sulfur autotrophic denitrification moving bed and denitrification method |
| CN117049703A (en) * | 2023-10-13 | 2023-11-14 | 南京正元环境工程有限公司 | Sulfur autotrophic denitrification reactor and denitrification method thereof |
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