CN104085987A - Method and device for synchronously realizing sewage nitrogen and phosphorus removal, residual sludge reduction and phosphorus resource recovery - Google Patents
Method and device for synchronously realizing sewage nitrogen and phosphorus removal, residual sludge reduction and phosphorus resource recovery Download PDFInfo
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Abstract
The invention discloses a method and a device for synchronously realizing sewage nitrogen and phosphorus removal, residual sludge reduction and phosphorus resource recovery. The device comprises an A/A/O (anoxic/anoxic/oxic) unit, an ozone treatment unit and a phosphorus recovery unit, wherein the ozone treatment unit comprises an ozone reactor and an ozone generator which are connected; the phosphorus recovery unit comprises a phosphorus release tank, a front precipitation tank, a phosphorus recovery tank, a rear precipitation tank and a sludge storage tank; the phosphorus release tank, the front precipitation tank, the phosphorus recovery tank and the rear precipitation tank are communicated in sequence; the phosphorus recovery tank is further connected with a dosing device; the bottom end of the front precipitation tank and the top end of the rear precipitation tank are communicated with the sludge storage tank; the sludge storage tank is communicated with an anoxic tank in the A/A/O unit; the bottom end of the precipitation tank in the A/A/O unit is communicated with the sludge inlet of the ozone reactor; the phosphorus release tank and the sludge outlet of the ozone reactor are communicated with an anaerobic tank. According to the method and device disclosed by the invention, on the premise of keeping the sewage nitrogen and phosphorus removal efficiency, residual sludge reduction and phosphorus resource recovery are realized synchronously, so that sludge treatment cost is lowered.
Description
Technical field
The present invention relates to a kind of method and device of synchronously realizing sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource, belong to technical field of sewage.
Background technology
The generation of a large amount of excess sludges has become the major issue that biological treatment faces.Dispose will direct or indirect threatening environment safety and public health without effectively processing for excess sludge, and the environmental benefit of sewage disposal is reduced greatly, even causes public's event.Existing sludge disposal technology mainly comprises: digestion and fermentation.Sludge disposal can be divided into disposal of resources and non-resourceization is disposed, and the former comprises soil utilization, agricultural sludge, burning electricity generation and material of construction utilization etc., and the latter refers to sanitary landfill.The treatment and disposal of excess sludge occupies very large ratio in the working cost of sewage work, and the susceptibility of disposing for sludge treatment the various problem of environmental pollutions that bring along with people constantly rises, the requirement of sludge treatment is more and more higher, sludge disposal is also subject to strict restriction, the cost that sludge treatment is disposed will constantly raise, and its proportion in cost of sewage disposal also will constantly increase.Because the excess sludge amount of having is large and the feature such as complicated component, make its easily generation secondary pollution in treatment and disposal process.Therefore, Sludge Reduction Technologies receives publicity, and investigators are studied it from different angles.
Existing sludge reduction method can be divided three classes: Physical, chemical method and biological process.Physical mainly comprises mechanical effect, thermal treatment, microwave, ultrasonic wave, radiation etc., but because the very large cost of its energy consumption is very high, uses very uneconomical in extensive sewage disposal.Chemical method mainly comprises acid-alkali treatment, Fenton reagent oxidation, supercritical water oxidation, chemicals uncoupling etc., but need to add for a long time a large amount of pharmaceutical chemicalss, maintain certain reaction conditions, to reactor require high, and there is the danger that produces secondary pollution, it is more difficult therefore in large-scale sewage disposal, to promote the use of.Biological process mainly comprises microorganism predation, biological enzyme, Multifunctional Compound Microorganism Product etc., but the influence factor of the method is more, and scale is more greatly more difficult to control.Therefore the mud source Decrement Technique, sludge reduction method being combined with biologic process for treating sewage has great importance for solving excess sludge problem.
Wherein, sludge ozone is processed the sludge ozone Decrement Technique combining with activated sludge process and has been proved to be a good Sludge Reduction Technologies of technical feasibility.Mud is intracellular organic matter stripping after ozonize, is back to after biological treatment system, and in system, microorganism can utilize this part material to carry out recessive growth, thereby realizes mud decrement.This technology has the advantages such as efficiency is high, simple to operate, non-secondary pollution.But this technology also comes with some shortcomings, for example the sludge reflux after ozonize to biosystem may cause effluent quality to worsen, and sewage disposal usefulness declines, especially for the removal of phosphorus.
Body eutrophication is mainly caused to excessive emissions in water body by nutritive elements such as nitrogen, phosphorus, so denitrogenation dephosphorizing becomes one of basic demand of sewage disposal.A/A/O technique is widely used in, in secondary or three grades of sewage disposals and middle water reuse, having good Nitrogen/Phosphorus Removal in China.Biological denitrificaion is to rely on aerobic nitrification and anoxic denitrification to realize, and often has in actual applications the problem of denitrifying carbon source deficiency, need to add additional carbon, thereby cause the rising of cost of sewage disposal.The organism being discharged in sludge ozone treating processes in supernatant liquor can be used as denitrifying carbon source.Therefore, A/A/O technique and sludge ozone are processed in conjunction with reducing the interpolation of even avoiding additional carbon.Biological phosphate-eliminating is to utilize the microbiological anaerobic of polyP bacteria one class to release the characteristic of phosphorus and aerobic suction phosphorus, the phosphorus in sewage is transferred in active sludge, then by appropriate spoil disposal, phosphorus is discharged to biological treatment system, thereby reach the effect of sewage dephosphorization.But along with the expansion of the increase of sewage disposal scale, the raising of cleanup standard and processing capacity, the output of rich phosphorous sludge significantly increases, and traditional rich phosphorous sludge is processed a large amount of losses and discharge that disposal means can cause phosphoric.A/A/O technique and sludge ozone are processed in conjunction with can significantly reducing excess sludge discharge, but mud reduction of discharging can cause phosphorus to be accumulated in biosystem, and the phosphorus in water outlet is raise gradually, causes the decline of biosystem Removal even to be lost.And biological phosphate-eliminating usefulness is difficult to promote largely, be difficult to meet more and more stricter effluent-disposal standard.
Due to the minimizing gradually in mineral phosphorus source, phosphor resource exhausts that having become one is subject to the problem that people pay close attention to.In sewage and mud, contain a large amount of phosphorus, can be used as phosphorus source.Therefore, chemical phosphorus recovery technique and A/A/O technique and sludge ozone processing are combined, not only can find an outlet for the phosphorus being accumulated in because of mud decrement in biosystem, and can reclaim phosphoric with phosphatic form.The mode that phosphorus reclaims can have influence on phosphorus organic efficiency and sewage dephosphorization effect.For example, the efficiency that reclaims phosphorus from ozonize in mud supernatant liquor be subject to sludge ozone process in phosphorus discharge and the restriction of mud decrement rate, be difficult to the decline of the biosystem Removal that full remuneration causes due to mud decrement; The efficiency that reclaims phosphorus from anaerobic supernatant is subject to the impact that anaerobic pond mud is released phosphorus ability, and phosphorus recovery ratio crosses the variation that conference causes microflora in biosystem, thereby affects the usefulness of system sewage disposal.
In sum, finding a kind of technique that can keep sewage denitrification and dephosphorization usefulness can synchronously realize again excess sludge reduction of discharging and reclamation of phosphorus resource has great importance for solution excess sludge and phosphor resource exhaustion problem.
Summary of the invention
The object of this invention is to provide a kind of method and device of synchronously realizing sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource, while using device provided by the invention and method to carry out sewage disposal, can keep under the prerequisite of sewage denitrification and dephosphorization usefulness, synchronously realize excess sludge and reduce discharging and reclamation of phosphorus resource, reduced the cost that sludge treatment is disposed.
The device of synchronously realizing sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource provided by the present invention, comprises A/A/O unit, ozonize unit and phosphorus recovery unit;
Described ozonize unit comprises ozone reactor and the ozonizer being connected;
Described phosphorus recovery unit comprises that phosphorus discharges pond, front settling tank, phosphorus pond for recovering, final settling tanks and sewage sludge storage pond; Described phosphorus discharges pond, front settling tank, phosphorus pond for recovering and final settling tanks and is communicated with successively, and described phosphorus pond for recovering is also connected with chemicals dosing plant; The bottom of described front settling tank is all connected with described sewage sludge storage pond with the top of described final settling tanks; Described sewage sludge storage pond is connected with the anoxic pond in described A/A/O unit;
The bottom of settling tank and the mud inlet of described ozone reactor in described A/A/O unit are connected;
Described phosphorus discharges pond and is connected with mud discharging mouth and the described anaerobic pond of described ozone reactor.
Device provided by the invention, described ozonize unit also comprises oxygenerator, described oxygenerator is connected with described ozonizer, to improve efficiency of ozone generation.
In device provided by the invention, described A/A/O unit adopts existing denitrification dephosphorization technique, wherein, anaerobic pond, anoxic pond, Aerobic Pond and settling tank are connected successively, anaerobic pond, anoxic pond and Aerobic Pond can merge setting, also can arrange separately, anaerobic pond setting separately, anoxic pond and Aerobic Pond can also be merged and arrange.When Aerobic Pond and anoxic pond, divide while being arranged, between the two, by internal reflux device, connect; When Aerobic Pond and anoxic pond merge while arranging, utilize dividing plate that the two is separated, utilize the gradient of Aerobic Pond bottom to realize the backflow of mud mixed liquid simultaneously, can not establish internal reflux device.
The present invention also further provides the method for utilizing said apparatus synchronously to realize sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource, comprises the steps:
(1) effluent stream is carried out organic matter removal and denitrogenation dephosphorizing through described A/A/O unit; In described settling tank, carry out the mud obtaining after mud-water separation, wherein a part of sludge reflux is to the anaerobic pond in described A/A/O unit, and a part of mud discharges as excess sludge, and a part of mud enters described ozonize unit;
(2) mud after described ozonize cell processing carries out mud-water separation after mixing in described phosphorus discharges pond with mud from described anaerobic pond in described front settling tank, the supernatant liquor I producing enters in described phosphorus pond for recovering carries out chemical phosphorus recovery, and the mud of described front settling tank bottom enters described sewage sludge storage pond;
(3) described supernatant liquor I and phosphorus recovery reagent act in described phosphorus pond for recovering, and the mixed solution of generation carries out solid-liquid separation in described final settling tanks, obtains calcium phosphate precipitation and supernatant liquor II, and described supernatant liquor II enters in described sewage sludge storage pond;
(4) mixed solution in described sewage sludge storage pond flows in described anoxic pond.
In above-mentioned method, the mud that described A/A/O unit produces reacts with ozone gas in described ozonize unit, realizes mud decrement.Sludge quantity for ozonize can be determined by the conservation of matter model of MLSS.In this model, think that mud decrement realized by ozonize completely, therefore, the sludge quantity reducing in ozonize equates with excess sludge CER.The flow of mud and the flow of excess sludge for ozonize can be estimated according to following formula.
Wherein, λ represents that the mud discharge for ozonize accounts for the ratio of flooding velocity (%), and δ represents that excess sludge flow accounts for the ratio of flooding velocity (%), and Q represents discharge (L/d), X
dthe MLSS concentration (g/L) that represents excess sludge, X represents MLSS mean concns (g/L) in bio-reactor, V represents the volume (L) of bio-reactor, SRT is sludge age (d), (%), σ represents the reduction rate (%) of mud to the dissolution rate (in the variation of MLSS concentration) that η represents mud in ozonize process.
In above-mentioned method, the anaerobic pond sludge quantity reclaiming for phosphorus is determined by phosphoric conservation model.In this model, think and with the amount that enters water and enter the phosphorus of system, equal to reclaim with water outlet, excess sludge and phosphorus the amount of the phosphorus of the system of discharging every day.The anaerobic pond mud discharge reclaiming for phosphorus can be estimated according to following formula.
Wherein, ζ represents that the anaerobic pond mud discharge reclaiming for phosphorus accounts for the ratio (%) of discharge, P
in, P
ef,, P
anand P
ozrepresent respectively the phosphorus concentration (g/L) in mud supernatant liquor after water, water outlet, anaerobic supernatant and ozonize, η
prepresent the efficiency (%) that phosphorus reclaims, θ represents the phosphorus content (%) of excess sludge.
For the system of a steady running, P
efaccording to the needs of emission standard, determine η, P
ozand η
pby sludge ozone, process experiment and phosphorus recovery experiment is determined, other parameters keep relative stability, can be definite according to the rule of thumb data in operational process.
In method of the present invention, the sludge reflux after phosphorus reclaims is to A/A/O unit anoxic pond, for anti-nitration reaction provides carbon source.
In above-mentioned method, in step (1), the average sludge concentration of described sewage can be 3～4g/L;
In described Aerobic Pond, sludge concentration can be 3～4g/L;
Described A/A/O carries out unit in denitrogenation dephosphorizing process, nitrification liquid internal reflux ratio (mixed solution is to the backflow ratio in anoxic pond in Aerobic Pond) can be 100%～200%, as 100% or 200%, return sludge ratio (for sludge reflux in settling tank is to the ratio in bio-reactor) can be 25%～100%, as 33% or 100%.
In above-mentioned method, in step (2), in described ozonize cell processing process, the dosage of ozone can be 0.1～0.15g O
3/ gSS, as 0.10g O
3/ gSS or 0.15g O
3/ gSS, wherein SS represents suspended solid material (suspended solids).
In above-mentioned method, in step (3), described phosphorus reclaims reagent can adopt at least one in lime (unslaked lime or white lime), calcium salt, ammonium salt/magnesium salts, aluminium salt and molysite, while using lime, ammonium salt/magnesium salts, calcium salt, the concrete method of crystallization that adopts is carried out the recovery of phosphorus, while using aluminium salt or molysite, specifically adopt the precipitator method to carry out the recovery of phosphorus;
Described ammonium salt/magnesium salts refers to the mixture of ammonium salt and magnesium salts.
Method provided by the invention is combined by biological treatment and chemical treatment technology, and wherein biological treatment is to be combined successively by anaerobic biological treatment, anoxic biological treatment and aerobic biological treatment; Chemical treatment technology is that sludge ozone is processed and chemical phosphorus recovery.After ozonize, mud flco is broken down into a large amount of discrete particles; Microorganism cells dissolves, and intracellular organic matter discharges, and the materials such as organism in mud liquid phase, nitrogen, phosphorus are significantly increased; The partial organic substances matter being discharged in mud liquid phase is CO by ozone mineralising
2and H
2o.Sludge reflux after ozonize is to biological treatment system, and microorganism utilizes the material that mud discharges to carry out recessive growth, thereby realizes mud decrement.The organism discharging in sludge ozone treating processes can be used as denitrifying carbon source, thereby reduces the interpolation of even having avoided additional carbon.In ozonize process, the release of phosphorus makes to have very high phosphorus concentration in mud supernatant liquor, to phosphorus, reclaims favourable.But the efficiency that after ozonize, mud supernatant liquor phosphorus reclaims is subject to the restriction that sludge ozone is processed, can not offset the decline that reduces discharging the biosystem Removal causing due to excess sludge completely.PolyP bacteria is under anaerobic released phosphorus, makes to have higher phosphorus concentration in anaerobic pond mud supernatant liquor, by anaerobic pond mud supernatant liquor phosphorus, is reclaimed and can further be offset the decline that reduces discharging the biosystem Removal causing due to excess sludge.Therefore, the present invention combines the two, after mud mixes with mud in a part of anaerobic pond after ozonize, the supernatant liquor of mixing sludge is carried out to phosphorus recovery, not only can realize the recovery of rich phosphorous sludge phosphorus but also can regulate and control biosystem Removal.The coupling application of biological treatment and chemical treatment technology, is guaranteeing, under the prerequisite of wastewater treatment efficiency, to have realized the reduction of discharging of excess sludge and the recovery of phosphor resource, has reduced the cost that sludge treatment is disposed.
The present invention is keeping under the prerequisite of sewage denitrification and dephosphorization usefulness, has synchronously realized excess sludge and has reduced discharging and reclamation of phosphorus resource, has reduced the cost that sludge treatment is disposed.
Accompanying drawing explanation
Fig. 1 is the structural representation of synchronously realizing the device of sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource provided by the invention.
In figure, each mark is as follows:
Before 1 tank, 2 anaerobic ponds, 3 anoxic pond, 4 Aerobic Ponds, 5I settling tank, 5II, settling tank, 5III final settling tanks, 6 air compressor machines, 7 ozone reactors, 8 ozonizers, 9 oxygenerators, 10 phosphorus discharge pond, 11 phosphorus pond for recoverings, 12 storage basins, 13 chemicals dosing plants, 14 mechanical stirring devices.
Fig. 2 is the schema of synchronously realizing the method for sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource provided by the invention.
Embodiment
The experimental technique using in following embodiment if no special instructions, is ordinary method.
In following embodiment, material used, reagent etc., if no special instructions, all can obtain from commercial channels.
Embodiment 1, synchronously realize the device of sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource
The structural representation of the device of synchronously realizing sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource provided by the invention as shown in Figure 1.
As shown in Figure 1, device provided by the invention comprises A/A/O unit, ozonize unit and phosphorus recovery unit, and wherein, in A/A/O unit, tank 1 connects anaerobic pond 2; Anaerobic pond 2, anoxic pond 3 and Aerobic Pond 4 merge setting, utilize dividing plate that they are separated, and open water hole (not shown) on dividing plate, by water hole, connect successively each pond; Aerobic Pond 4 connects settling tank 5; Anaerobic pond 2 and anoxic pond 3 are installed respectively mechanical stirring device 14, and the interior laying aeration tube of Aerobic Pond 4 (not shown), connects air compressor machine 6 by pipeline; The nitrification liquid of Aerobic Pond 4 is back in anoxic pond 3.Settling tank 5I bottom is connected with the mud inlet of ozone reactor 7 with anaerobic pond 2 respectively; Ozonizer 8 connects the inlet mouth of ozone reactors 7, and oxygenerator 9 provides oxygen for ozonizer 8, and ozone reactor 7, ozonizer 8 and oxygenerator 9 form ozonize unit.In phosphorus recovery unit, phosphorus discharges pond 10 and is connected with anaerobic pond 2 with the mud discharging mouth of ozone reactor 7.Phosphorus release pond 10, front settling tank 5II, phosphorus pond for recovering 11 are connected successively with final settling tanks 5III.Chemicals dosing plant 13 provides phosphorus recovery catalyst for phosphorus pond for recovering 11.The supernatant liquor of the thickened sludge of front settling tank 5II and final settling tanks 5III enters in storage basin 12.Storage basin 12 is connected with anoxic pond 3.Phosphorus discharges in pond 10, phosphorus pond for recovering 11 and storage basin 12 all installs mechanical stirring device 14.
Embodiment 2, synchronously realize the method that sewage denitrification and dephosphorization, excess sludge reduction and phosphorus reclaim
The device that utilizes embodiment 1 to provide, synchronously realizes sewage denitrification and dephosphorization, excess sludge reduction and phosphorus and reclaims, and technical process as shown in Figure 2.
Sewage in tank 1 with together with returned sluge in settling tank 5I, enter into anaerobic pond 2 and carry out the release of phosphorus and the ammonification of partial organic substances.Together with the nitrification liquid that the mixed solution of anaerobic pond 2 refluxes with Aerobic Pond 4, enter anoxic pond 3 and carry out denitrification denitrogenation.The mixed solution of anoxic pond 3 enters the excessive absorption that Aerobic Pond 4 carries out organic matter removal, nitration reaction and phosphorus.The mixed solution of Aerobic Pond 4 enters settling tank 5I and carries out mud-water separation, supernatant liquor discharge, and a thickened sludge part is back to anaerobic pond 2 as returned sluge, and a part enters ozone reactor 7, and a part is as excess sludge discharge.Mud after ozonize enters into phosphorus release pond 10 to be mixed with the mud of a part from anaerobic pond 2, then enters into front settling tank 5II and carries out mud-water separation, and supernatant liquor enters into phosphorus pond for recovering 11 and carries out chemical phosphorus recovery.Mixed solution in phosphorus pond for recovering 11 carries out solid-liquid separation in final settling tanks 5III, with the form recovery phosphorus of calcium phosphate precipitation.Together with the mud of front settling tank 5II bottom and the supernatant liquor of final settling tanks 5III, enter storage basin 12, after mixing therein, be back in anoxic pond 3.In sludge ozone treating processes, be discharged into the carbon source that organism in supernatant liquor can be used as anti-nitration reaction in anoxic pond 3.
By aforesaid method, in removing sewage, in organism, nitrogen, phosphorus, realized the decrement discharge of excess sludge, reduced the cost that sludge treatment is disposed, reduce and even avoided adding of anoxic pond additional carbon, realized the recovery of phosphor resource.
The processing of embodiment 3, synthetic sanitary sewage
According to the method in embodiment 2, test, test conditions and result are as follows:
Average water quality: the COD of intaking is 350mg/L, and TN is 35mg/L, NH
3-N is 35mg/L, and TP is 3mg/L.In A/A/O bio-reactor, average sludge concentration is 3g/L, Aerobic Pond sludge concentration is about 3.5g/L, and Aerobic Pond is 33% to the return sludge ratio of anaerobic pond, and Aerobic Pond to the nitrification liquid internal reflux ratio of anoxic pond is 100%, SRT=25d, the MLSS concentration of excess sludge is about 8.1g/L.Ozone dosage is 0.10g O
3/ g SS, mud dissolution rate is 35%, λ=1.8%, after ozonize, in mud supernatant liquor, phosphorus concentration is about 52mg/L.Adopt Ca (OH)
2as dephosphorization agent, in anaerobic pond, in supernatant liquor, phosphorus concentration is about 6mg/L, ζ=17%, and dephosphorization efficiency by using is about 90%.After testing, effluent quality average out to: COD is 23mg/L, NH
3-N is 0.2mg/L, TN is 11.1mg/L, TP is 0.34mg/L, and each index all reaches the one-level A standard of < < urban wastewater treatment firm pollutant emission standard > > (GB18918 – 2000).Excess sludge reduction rate is about 70%.Entering in water approximately 60% phosphorus is recycled.
Sewage disposal in embodiment 4, municipal sewage plant
According to the method in embodiment 2, test, test conditions and result are as follows
Average water quality: the COD of intaking is 395mg/L, and SS is 150mg/L, NH
3-N is 35mg/L, and TN is 72mg/L, and TP is 6mg/L.In A/A/O bio-reactor, average sludge concentration is 4g/L, the sludge concentration of Aerobic Pond is about 3.0g/L, and Aerobic Pond is 100% to the return sludge ratio of anaerobic pond, and Aerobic Pond to the internal reflux ratio of anoxic pond is 200%, SRT=25d, the MLSS concentration of excess sludge is about 7.8g/L.Ozone dosage is 0.15g O
3/ gSS, mud dissolution rate is 38%, λ=2.2%, after ozonize, in mud supernatant liquor, the concentration of phosphorus is 61mg/L.Adopt struvite method to carry out mud supernatant liquor chemical dephosphorization, in anaerobic pond, in supernatant liquor, the concentration of phosphorus is about 10mg/L, ζ=22%, and dephosphorization efficiency by using is about 90%.After testing, effluent quality average out to: COD is 32mg/L, and SS is 5mg/L, NH
3-N is 1.5mg/L, TN is 12.7mg/L, TP is 0.47mg/L, and each index all reaches the one-level A standard of < < urban wastewater treatment firm pollutant emission standard > > (GB18918 – 2000).Excess sludge reduction rate is about 70%.Entering in water approximately 55% phosphorus is recycled.
Above embodiment is one of embodiment of the present invention, and embodiments of the present invention are not restricted to the described embodiments, and the change that other any the present invention of not deviating from does all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (7)
1. synchronously realize a device for sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource, it is characterized in that:
Described device comprises A/A/O unit, ozonize unit and phosphorus recovery unit;
Described ozonize unit comprises ozone reactor and the ozonizer being connected;
Described phosphorus recovery unit comprises that phosphorus discharges pond, front settling tank, phosphorus pond for recovering, final settling tanks and sewage sludge storage pond; Described phosphorus discharges pond, front settling tank, phosphorus pond for recovering and final settling tanks and is communicated with successively, and described phosphorus pond for recovering is also connected with chemicals dosing plant; The bottom of described front settling tank is all connected with described sewage sludge storage pond with the top of described final settling tanks; Described sewage sludge storage pond is connected with the anoxic pond in described A/A/O unit;
The bottom of settling tank and the mud inlet of described ozone reactor in described A/A/O unit are connected;
Described phosphorus discharges pond and is connected with mud discharging mouth and the described anaerobic pond of described ozone reactor.
2. device according to claim 1, is characterized in that: described ozonize unit also comprises oxygenerator, and described oxygenerator is connected with described ozonizer.
3. utilize device described in claim 1 or 2 synchronously to realize the method for sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource, comprise the steps:
(1) effluent stream is carried out organic matter removal and denitrogenation dephosphorizing through described A/A/O unit; In described settling tank, carry out the mud obtaining after mud-water separation, wherein a part of sludge reflux is to the anaerobic pond in described A/A/O unit, and a part of mud discharges as excess sludge, and a part of mud enters described ozonize unit;
(2) mud after described ozonize cell processing carries out mud-water separation after mixing in described phosphorus discharges pond with mud from described anaerobic pond in described front settling tank, the supernatant liquor I producing enters in described phosphorus pond for recovering carries out chemical phosphorus recovery, and the mud of bottom enters described sewage sludge storage pond;
(3) described supernatant liquor I and phosphorus recovery reagent act in described phosphorus pond for recovering, and the mixed solution of generation carries out solid-liquid separation in described final settling tanks, obtains sulfate precipitation and supernatant liquor II, and described supernatant liquor II enters in described sewage sludge storage pond;
(4) mixed solution in described sewage sludge storage pond flows in described anoxic pond.
4. method according to claim 3, is characterized in that: in step (1), the average sludge concentration of described sewage is 3～4g/L;
In described Aerobic Pond, sludge concentration is 3-4g/L;
Described A/A/O carries out unit in the process of denitrogenation dephosphorizing, and nitrification liquid internal reflux ratio is 100%～200%, and return sludge ratio is 25%～100%.
5. according to the method described in claim 3 or 4, it is characterized in that: in step (2), in described ozonize cell processing process, the charging capacity of ozone is 0.1～0.15g O
3/ g SS, wherein SS represents suspended solid material.
6. according to the method described in any one in claim 3-5, it is characterized in that: in step (3), it is at least one in lime, calcium salt, ammonium salt/magnesium salts, aluminium salt and molysite that described phosphorus reclaims reagent.
7. the application of the device of synchronously realizing sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource described in claim 1 or 2 in sewage disposal.
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| CN105948436A (en) * | 2016-06-29 | 2016-09-21 | 崔恩喜 | System and method for stabilizing and recycling excess sludge of sewage treatment plant |
| CN106915878A (en) * | 2017-03-24 | 2017-07-04 | 博天环境集团股份有限公司 | The recovery method of phosphorus in a kind of phosphorus containing sludge |
| CN107216005A (en) * | 2017-07-28 | 2017-09-29 | 湖南科技大学 | The sewage-treatment plant and process of a kind of enhanced biological nitrogen removal chemical dephosphorization |
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| CN114291994A (en) * | 2022-02-17 | 2022-04-08 | 中国电建集团中南勘测设计研究院有限公司 | Sludge reduction system and bypass-type in-situ sludge reduction sewage treatment system and process |
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