CN210656360U - Landfill leachate anaerobic ammonia oxidation deep denitrification combined treatment device - Google Patents
Landfill leachate anaerobic ammonia oxidation deep denitrification combined treatment device Download PDFInfo
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- CN210656360U CN210656360U CN201921505411.0U CN201921505411U CN210656360U CN 210656360 U CN210656360 U CN 210656360U CN 201921505411 U CN201921505411 U CN 201921505411U CN 210656360 U CN210656360 U CN 210656360U
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Abstract
The utility model belongs to the technical field of sewage treatment technique and specifically relates to landfill leachate anammox degree of depth denitrogenation combination processing apparatus. The utility model discloses constitute by four independent reactors: anaerobic SBR-decarbonized SBR-short-cut nitrification SBR and a rotary ceramic membrane reactor. The anaerobic SBR has the main function of removing most of organic matters in the landfill leachate, and the carbon removal SBRThe main function is to remove the residual BOD in the percolate5The short-cut nitrification SBR has the main function of realizing short-cut nitrification of the landfill leachate, and the rotary ceramic membrane reactor has the main function of realizing deep denitrification of the landfill leachate through the action of anaerobic ammonium oxidation bacteria. Through the utility model discloses a landfill leachate anaerobic ammonium oxidation degree of depth denitrogenation combination processing apparatus and technology, the BOD of filtration liquid5The removal rate can reach more than 99 percent, and the removal rate of the total nitrogen can reach more than 95 percent.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment technique and specifically relates to landfill leachate anammox degree of depth denitrogenation combination processing apparatus.
Background
The traditional landfill leachate denitrification technology mainly comprises an A/O process, an oxidation ditch, SBR and the like. Although the A/O process has a single anoxic zone for denitrification and has a high denitrification rate, the denitrification rate is difficult to reach more than 90 percent due to the preposed denitrification; the oxidation ditch process is not very efficient either because it has no distinct nitrification and denitrification zones. The traditional SBR process generally adopts a post denitrification method to realize the deep denitrification of the percolate, but needs an additional carbon source and has high treatment cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a landfill leachate anaerobic ammonia oxidation degree of depth denitrogenation combination processing apparatus, overcome the not enough of aforementioned prior art, through four reactors, get rid of but the biochemical organic matter of the overwhelming majority in the filtration liquid and total nitrogen more than 95%.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides a landfill leachate anaerobic ammonia oxidation degree of depth denitrogenation combined treatment device, includes former water tank, passes through the anaerobism SBR of pipeline intercommunication with former water tank, passes through the middle water tank A of pipeline intercommunication with anaerobism SBR, passes through the decarbonization SBR of pipeline intercommunication with middle water tank A, passes through the middle water tank B of pipeline intercommunication with decarbonization SBR, nitrifies SBR through the short cut of pipeline intercommunication with the short cut, passes through the middle water tank C of pipeline intercommunication with the short cut and passes through the rotatory ceramic membrane reactor of pipeline intercommunication with middle water tank C, middle water tank B passes through pipeline and middle water tank C intercommunication, set up in the outlet pipe on the rotatory ceramic membrane reactor.
Further, be provided with agitator and pH probe in the anaerobism SBR, be provided with aeration system and pH probe in the decarbonization SBR, be provided with aeration system and pH probe in the short distance nitration SBR, contain the anaerobic ammonia oxidation activated sludge in the rotatory ceramic membrane reactor, be provided with the pH probe in the rotatory ceramic membrane reactor, rotatory ceramic membrane reactor top is provided with gas collection system.
An anaerobic ammonia oxidation and deep denitrification combined treatment process for landfill leachate comprises the following process steps:
(1) mixing the leachate stock solution with the effluent of part of the rotary ceramic membrane, then firstly entering anaerobic SBR, starting a stirrer of the anaerobic SBR, removing biochemical organic matters in the leachate through a methane production process, taking pH as a control parameter in the reaction process, raising the pH in the denitrification and methane production processes, stopping stirring when the pH is reduced, indicating that the organic matters in the system are basically removed, precipitating and draining water, and discharging the treated leachate into an intermediate water tank A;
(2) the leachate enters the decarbonization SBR from the intermediate water tank A, an aeration system of the decarbonization SBR is started to aerate, and further, biochemical organic matters remained in the leachate are removed;
(3) part of percolate in the intermediate water tank B then enters the short-range nitrification SBR, an aeration system of the short-range SBR is started for aeration nitrification, when the pH value of the system drops to a rising inflection point, the system nitrification is finished, aeration is stopped at the moment, precipitation and drainage are carried out, and effluent is discharged into the intermediate water tank C;
(4) mixing the effluent of the short-cut nitrification SBR and the effluent of the intermediate water tank B in the intermediate water tank C according to the proportion of (1-1.5) to 1, and feeding the mixed solution into the rotary ceramic membrane reactor;
(5) the rotary ceramic membrane reactor contains a large amount of anaerobic ammonia oxidation activated sludge, after water enters, the rotary ceramic membrane starts to rotate, anaerobic ammonia oxidation bacteria realize denitrification on leachate through metabolism of the anaerobic ammonia oxidation bacteria, as the denitrification process is a gas production process, in the reaction process, the water outlet pipe end of the ceramic membrane is closed, the gas circuit of the gas collection system is opened for exhaust, the end point is judged by observing the pH change of the system in the reaction process, when the pH value of the system rises to the falling inflection point, the denitrification of the system is indicated to be finished, the gas circuit of the gas collection system is closed at the moment, the water outlet end is opened, water is drained, and the next treatment period is started.
Preferably, the drainage ratio of the anaerobic SBR in the step (1) is 30%, and the sludge concentration is 10-15 g/L.
Preferably, the carbon-removing SBR has a water discharge ratio of 30 percent, a sludge concentration of 4-5g/L and dissolved oxygen of 2-3mg/L after an aeration system is opened.
Preferably, the drainage ratio of the short-cut nitrification SBR is 30%, the sludge concentration is 4-5g/L, and the dissolved oxygen is controlled to be 2-3mg/L after an aeration system is opened.
Preferably, the effluent of the intermediate water tank B and the effluent of the short-cut nitrification SBR in the step (4) are mixed in the intermediate water tank C according to the ratio of 1: 1.3.
Preferably, the drainage ratio of the rotary ceramic membrane reactor is 20%, and the sludge concentration is 10-12 g/L.
The utility model discloses constitute by four independent reactors: anaerobic SBR-decarbonized SBR-short-cut nitrification SBR and a rotary ceramic membrane reactor. The anaerobic SBR has the main function of removing most organic matters in the landfill leachate, and the carbon removal SBR has the main function of removing the residual BOD in the leachate5The short-cut nitrification SBR has the main function of realizing short-cut nitrification of the landfill leachate, and the rotary ceramic membrane reactor has the main function of realizing deep denitrification of the landfill leachate through the action of anaerobic ammonium oxidation bacteria.
By the two processes of anaerobic SBR and carbon removal SBR, the removal rate of biochemical organic matters in the percolate can reach more than 99 percent. Pollutants in the leachate mainly comprise ammonia nitrogen, and the last two short-range nitrification SBR and rotary ceramic membrane reactors of the combined process are mainly designed aiming at the total nitrogen of the leachate. 99 percent of total nitrogen of effluent of the short-cut nitrification SBR consists of nitrite nitrogen, provides necessary substrate for anaerobic ammonia oxidation denitrification in later period, and the BOD of percolate is treated by the combined process5The removal rate can reach more than 99 percent, and the removal rate of the total nitrogen can reach more than 95 percent.
The utility model discloses a main theory of operation does: the anaerobic ammonium oxidation bacteria are high-efficiency autotrophic denitrogenation bacteria, but the reaction mechanism is nitrite nitrogen and ammonia nitrogen, and organic matters cannot be contained; the anaerobic SBR mainly has the functions of removing most organic matters in the percolate, the decarbonization SBR removes the remaining biochemical organic matters in the percolate in an aerobic mode, and the shortcut nitrification SBR changes ammonia nitrogen in the percolate into nitrite nitrogen through aeration so as to provide a necessary substrate for anaerobic ammonia oxidation; finally, one percolate containing ammonia nitrogen and the other percolate containing nitrite nitrogen enter the rotary ceramic membrane reactor according to a certain proportion; a large amount of anaerobic ammonia oxidizing bacteria are inoculated on the rotary ceramic membrane, and anaerobic ammonia oxidizing autotrophic denitrification reaction can occur under the conditions of containing a large amount of ammonia nitrogen and nitrite nitrogen and almost no organic matters, so that the deep denitrification of the percolate is realized; the rotary ceramic membrane is a membrane reactor on the one hand, so that anaerobic ammonia oxidizing bacteria can be prevented from losing, the sludge concentration is greatly improved, and meanwhile, hydraulic shearing force is provided in a rotary mode, so that the mixing of system muddy water is guaranteed, the surface of the membrane can be washed, and the membrane flux is guaranteed.
The utility model has the advantages that: compared with the prior art, the utility model discloses a landfill leachate anaerobic ammonia oxidation degree of depth denitrogenation combination processing apparatus has following advantage: most of biochemical organic matters and more than 95 percent of total nitrogen in the percolate can be removed through the four reactors; the effluent of the combined process can directly meet the requirement of total nitrogen in the latest national landfill leachate discharge standard; moreover, the combined process is an effective combination of a high-efficiency autotrophic deep denitrification process, an anaerobic ammonia oxidation process, a novel ceramic membrane process and a rotary ceramic membrane process; the anaerobic ammonia oxidation process has high denitrification efficiency, but can realize excellent treatment effect only by needing higher sludge concentration; the advantages of the rotary ceramic membrane are that the corrosion resistance of the ceramic membrane is strong, the service life is long, the membrane flux is ensured through rotation, the anaerobic environment required by anaerobic ammonia oxidation is met without aeration, and finally, due to the existence of the membrane, the activated sludge can reach high concentration, and the denitrification effect on leachate is improved.
Drawings
FIG. 1 is a schematic front view of the overall structure of the present invention;
FIG. 2 is a diagram showing the denitrification effect of the deep denitrification combined treatment process for landfill leachate of the present invention;
FIG. 3 is a graph showing the change of the substrate in one cycle of the rotating ceramic membrane reactor of the present invention;
wherein, 1 raw water tank, 2 anaerobic SBR, 3 intermediate water tank A, 4 carbon removal SBR, 5 intermediate water tank B, 6 short distance nitration SBR, 7 intermediate water tank C, 8 rotary ceramic membrane reactor, 9 water outlet pipe, 10 gas collection system, 11 pH probe, 12 aeration system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.
As shown in fig. 1, the anaerobic ammonia oxidation and deep denitrification combined treatment device for landfill leachate comprises a raw water tank 1, an anaerobic SBR2 communicated with the raw water tank 1 through a pipeline, an intermediate water tank A3 communicated with an anaerobic SBR2 through a pipeline, a decarbonization SBR4 communicated with the intermediate water tank A3 through a pipeline, an intermediate water tank B5 communicated with the decarbonization SBR4 through a pipeline, a short-cut nitrification SBR6 communicated with the intermediate water tank B5 through a pipeline, an intermediate water tank C7 communicated with the short-cut nitrification SBR6 through a pipeline, and a rotary ceramic membrane reactor 8 communicated with the intermediate water tank C7 through a pipeline, wherein the intermediate water tank B5 is communicated with the intermediate water tank C7 through a pipeline, and the rotary ceramic membrane reactor 8 is arranged on a water outlet pipe 9.
In this embodiment, a stirrer and a pH probe 11 are arranged in anaerobic SBR2, an aeration system 12 and a pH probe 11 are arranged in decarbonization SBR4, an aeration system 12 and a pH probe 11 are arranged in shortcut nitrification SBR6, anaerobic ammonium oxidation activated sludge is contained in rotary ceramic membrane reactor 8, a pH probe 11 is arranged in rotary ceramic membrane reactor 8, and a gas collection system 10 is arranged at the top of rotary ceramic membrane reactor 8
The treatment process of example 2 was relied on the treatment apparatus of example 1.
In the embodiment, the COD of the leachate is 9100mg/L +/-500 mg/L, and the total nitrogen concentration is 1350mg/L +/-100 mg/L.
The landfill leachate anaerobic ammonia oxidation and deep denitrification combined treatment process comprises the following process steps:
(1) mixing the leachate stock solution and part of effluent of the rotary ceramic membrane, then firstly entering anaerobic SBR, starting a stirrer of the anaerobic SBR, removing biochemical organic matters in the leachate through a denitrification process, a hydrolysis acidification process and a methane production process, taking pH as a control parameter in the reaction process, wherein the pH rises in the denitrification and methane production processes, when the pH drops, indicating that the organic matters in the system are basically removed, stopping stirring, precipitating and draining, and discharging the treated leachate into an intermediate water tank A;
(2) the leachate enters the decarbonization SBR from the intermediate water tank A, an aeration system of the decarbonization SBR is started to aerate, and further, biochemical organic matters remained in the leachate are removed;
(3) part of percolate in the intermediate water tank B then enters the short-range nitrification SBR, an aeration system of the short-range SBR is started for aeration nitrification, when the pH value of the system drops to a rising inflection point, the system nitrification is finished, aeration is stopped at the moment, precipitation and drainage are carried out, and effluent is discharged into the intermediate water tank C;
(4) mixing the effluent of the intermediate water tank B and the effluent of the short-range SBR in the intermediate water tank C according to the proportion of 1:1.3, and feeding the mixed solution into a rotary ceramic membrane reactor;
(5) the rotary ceramic membrane reactor contains a large amount of anaerobic ammonia oxidation activated sludge, after water enters, the rotary ceramic membrane starts to rotate, anaerobic ammonia oxidation bacteria realize denitrification on leachate through metabolism of the anaerobic ammonia oxidation bacteria, as the denitrification process is a gas production process, in the reaction process, the water outlet pipe end of the ceramic membrane is closed, the gas circuit of the gas collection system is opened for exhaust, the end point is judged by observing the pH change of the system in the reaction process, when the pH value of the system rises to the falling inflection point, the denitrification of the system is indicated to be finished, the gas circuit of the gas collection system is closed at the moment, the water outlet end is opened, water is drained, and the next treatment process is started.
In the embodiment, the drainage ratio of the anaerobic SBR in the step (1) is 30%, and the sludge concentration is 10-15 g/L. In the step (2), the carbon-removing SBR has a water discharge ratio of 30 percent and a sludge concentration of 4-5g/L, and the dissolved oxygen is controlled at 2-3mg/L after an aeration system is opened. The method is characterized in that: in the step (3), the drainage ratio of the short-cut nitrification SBR is 30%, the sludge concentration is 4-5g/L, and the dissolved oxygen is controlled at 2-3mg/L after an aeration system is opened. The water discharge ratio of the rotary ceramic membrane reactor in the step (5) is 20%, and the sludge concentration is 10-12 g/L.
As can be seen from FIG. 2, the main function of the anaerobic SBR is to remove organic matters in the leachate, the COD content of the leachate of the effluent of the anaerobic SBR is greatly reduced, and the removal rate of the COD reaches over 90 percent. Then, the leachate enters the carbon removal SBR. Through the treatment of the carbon removal SBR, the COD of the percolate is further reduced, and the COD of the effluent is reduced to about 750 mg/L. After aerobic treatment, leachate has more than 99 percent of BOD5Is oxidized by oxygenAnd the residual COD is macromolecular organic matters which are difficult to degrade, and microorganisms are difficult to utilize and remove. And part of effluent of the carbon-removing SBR enters the short-cut nitrification SBR to be nitrified. Through the treatment of the short-cut nitrification SBR, the total nitrogen of the percolate does not change greatly, but the removal rate of ammonia nitrogen reaches 99 percent, and the total nitrogen is converted into nitrite nitrogen from the ammonia nitrogen, thereby providing a necessary substrate for the subsequent anaerobic ammonia oxidation. The effluent of partial carbon-removing SBR and the effluent of short-cut nitrifying SBR enter an intermediate water tank 3 according to a certain proportion. After mixing, the ammonia nitrogen and nitrite nitrogen concentration of the leachate are reduced, but the total nitrogen concentration is not changed greatly. And then, the leachate enters a ceramic membrane anaerobic ammonia oxidation reactor. After anaerobic ammonia oxidation denitrification, the ammonia nitrogen concentration and the nitrite nitrogen concentration of the leachate are both lower than 5mg/L, the total nitrogen in the effluent is mainly nitrate nitrogen, and the concentration is lower than 100 mg/L. The combined process can stably reach over 90 percent of the total nitrogen removal rate of the leachate without any carbon source.
The change of the total nitrogen of the landfill leachate in one period is shown in fig. 3, as can be seen from fig. 3, under the condition that the total nitrogen inlet concentration is 1345mg/L, the rotary ceramic membrane anaerobic ammonia oxidation reactor completes the reaction within 6 hours, the concentration of the ammonia nitrogen and the nitrite nitrogen in the outlet water respectively reach 1.3mg/L and 0.2mg/L, the total nitrogen concentration is only 91mg/L, and compared with the inlet water, the removal rates of the ammonia nitrogen and the total nitrogen respectively reach more than 99% and 90% without any carbon source.
The above embodiments are only specific cases of the present invention, and the protection scope of the present invention includes but is not limited to the forms and styles of the above embodiments, and any suitable changes or modifications made thereto 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. The utility model provides a landfill leachate anammox degree of depth denitrogenation combination processing apparatus which characterized in that: including former water tank, pass through the anaerobism SBR of pipeline intercommunication with former water tank, pass through the middle water tank A of pipeline intercommunication with anaerobism SBR, pass through the decarbonization SBR of pipeline intercommunication with middle water tank A, pass through the middle water tank B of pipeline intercommunication with decarbonization SBR, nitrify SBR, pass through the middle water tank C of pipeline intercommunication and pass through the rotatory ceramic membrane reactor of pipeline intercommunication with middle water tank C with the short distance that middle water tank B passes through the pipeline intercommunication, middle water tank B passes through pipeline and middle water tank C intercommunication, set up in the outlet pipe on the rotatory ceramic membrane reactor.
2. The combined anaerobic ammonia oxidation and advanced nitrogen removal treatment device for landfill leachate of claim 1, which is characterized in that: and a stirrer and a pH probe are arranged in the anaerobic SBR.
3. The combined anaerobic ammonia oxidation and advanced nitrogen removal treatment device for landfill leachate of claim 1, which is characterized in that: and an aeration system and a pH probe are arranged in the carbon removal SBR.
4. The combined anaerobic ammonia oxidation and advanced nitrogen removal treatment device for landfill leachate of claim 1, which is characterized in that: an aeration system and a pH probe are arranged in the short-cut nitrification SBR.
5. The combined anaerobic ammonia oxidation and advanced nitrogen removal treatment device for landfill leachate of claim 1, which is characterized in that: the rotary ceramic membrane reactor contains anaerobic ammonium oxidation activated sludge, a pH probe is arranged in the rotary ceramic membrane reactor, and a gas collecting system is arranged at the top of the rotary ceramic membrane reactor.
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