CN104085987B - Synchronously realize method and the device of sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource - Google Patents

Synchronously realize method and the device of sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource Download PDF

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CN104085987B
CN104085987B CN201410328203.3A CN201410328203A CN104085987B CN 104085987 B CN104085987 B CN 104085987B CN 201410328203 A CN201410328203 A CN 201410328203A CN 104085987 B CN104085987 B CN 104085987B
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phosphorus
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mud
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CN104085987A (en
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强志民
汪鲁
董慧峪
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Research Center for Eco Environmental Sciences of CAS
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Abstract

The invention discloses a kind of method and the device that synchronously realize sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource.This device comprises A/A/O unit, ozonize unit and phosphorus recovery unit; Ozonize unit comprises the ozone reactor and ozonizer that are connected; Phosphorus recovery unit comprises Phosphurus release pond, front settling tank, phosphorus pond for recovering, final settling tanks and sewage sludge storage pond; Phosphurus release pond, front settling tank, phosphorus pond for recovering are communicated with successively with final settling tanks, and phosphorus pond for recovering is also connected with chemicals dosing plant; The bottom of front settling tank is all connected with sewage sludge storage pond with the top of final settling tanks; Sewage sludge storage pond is connected with the anoxic pond in A/A/O unit; The bottom of the settling tank in A/A/O unit is connected with the mud inlet of ozone reactor; Phosphurus release pond is connected with anaerobic pond with the mud discharging mouth of ozone reactor.The present invention, under the prerequisite keeping sewage denitrification and dephosphorization usefulness, synchronously achieves excess sludge and reduces discharging and reclamation of phosphorus resource, reduce the cost of specific resistance to filtration.

Description

Synchronously realize method and the device of sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource
Technical field
The present invention relates to a kind of method and the device that synchronously realize 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 sludge has become the major issue that biological treatment faces.Excess sludge will directly or indirect threats environmental safety and public health, make the environmental benefit of sewage disposal greatly reduce, even initiation public event without effective process disposal.Existing sludge disposal technology mainly comprises: digestion and fermentation.Sludge disposal can be divided into disposal of resources and non-resourceization to dispose, and the former comprises Land_use change, 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 the various problem of environmental pollutions brought for specific resistance to filtration 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 of specific resistance to filtration 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 it in treatment and disposal process, easily produce secondary pollution.Therefore, Sludge Reduction Technologies receives publicity, and investigators are studied from different angles it.
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 due to the very large cost of its energy consumption very high, use 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 a large amount of pharmaceutical chemicalss for a long time, maintain certain reaction conditions, high to the requirement of reactor, and there is the danger producing secondary pollution, it is more difficult therefore to promote the use of in large-scale sewage disposal.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 difficult to more greatly control.Therefore, the mud Sources decreasing technology combined with biologic process for treating sewage by sludge reduction method has great importance for solving excess sludge problem.
Wherein, the sludge ozone Decrement Technique that sludge ozone process combines with activated sludge process has been proved to be a good Sludge Reduction Technologies of technical feasibility.Mud is intracellular organic matter stripping after ozonize, and after being back to biological treatment system, in system, microorganism can utilize this part material to carry out recessive growth, thus 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, such as, 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 the nutritive element such as nitrogen, phosphorus, therefore one of denitrogenation dephosphorizing basic demand becoming sewage disposal.A/A/O technique is widely used in, in secondary or three grades of sewage disposals and Treated sewage reusing, having good Nitrogen/Phosphorus Removal in China.Biological denitrificaion relies on aerobic nitrification and anoxic denitrification to realize, and often there is the problem of denitrifying carbon source deficiency in actual applications, need to add additional carbon, thus cause the rising of cost of sewage disposal.The organism be discharged in sludge ozone treating processes in supernatant liquor can as denitrifying carbon source.Therefore, A/A/O technique is combined the interpolation that can reduce and even avoid additional carbon with sludge ozone process.Biological phosphate-eliminating is the characteristic utilizing the microbiological anaerobic of polyP bacteria one class to release phosphorus and aerobic suction phosphorus, is transferred in active sludge by the phosphorus in sewage, then by appropriate spoil disposal, phosphorus is discharged biological treatment system, thus reaches 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 a large amount of loss and discharge that means can cause phosphoric are disposed in traditional rich phosphorous sludge process.A/A/O technique and sludge ozone process combine and significantly can reduce excess sludge discharge, but sludge emission reduction can cause phosphorus to be accumulated in biosystem, and the phosphorus in water outlet is raised 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 is exhausted has become a problem being subject to people and paying close attention to.A large amount of phosphorus is contained in sewage and mud, can as phosphorus source.Therefore, chemical phosphorus recovery technique is combined with A/A/O technique and sludge ozone process, not only can find an outlet for the phosphorus be accumulated in because of mud decrement in biosystem, and phosphoric can be reclaimed in the form of phosphate.The mode that phosphorus reclaims can have influence on phosphorus organic efficiency and sewage dephosphorization effect.Such as, the efficiency reclaiming phosphorus after ozonize mud supernatant liquor is subject to the restriction of Phosphurus release and mud decrement rate in sludge ozone process, is difficult to the decline of the biosystem Removal that full remuneration causes due to mud decrement; The efficiency reclaiming phosphorus from anaerobic supernatant is subject to the impact that anaerobic pond mud releases phosphorus ability, and phosphorus reclaims ratio and crosses the change that conference causes microflora in biosystem, thus the usefulness of influential system sewage disposal.
In sum, find a kind of technique that sewage denitrification and dephosphorization usefulness can be kept synchronously can to realize again excess sludge reduction of discharging and reclamation of phosphorus resource and solution excess sludge and phosphor resource are exhausted that problem has great importance.
Summary of the invention
The object of this invention is to provide a kind of method and the device that synchronously realize sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource, when using device provided by the invention and method to carry out sewage disposal, can under the prerequisite keeping sewage denitrification and dephosphorization usefulness, synchronously realize excess sludge to reduce discharging and reclamation of phosphorus resource, reduce the cost of specific resistance to filtration.
The device 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 the ozone reactor and ozonizer that are connected;
Described phosphorus recovery unit comprises Phosphurus release pond, front settling tank, phosphorus pond for recovering, final settling tanks and sewage sludge storage pond; Described Phosphurus release pond, front settling tank, phosphorus pond for recovering are communicated with successively with final settling tanks, 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 the settling tank in described A/A/O unit is connected with the mud inlet of described ozone reactor;
Described Phosphurus release pond is connected with described anaerobic pond with the mud discharging mouth of described ozone reactor.
Device provided by the invention, described ozonize unit also comprises oxygenerator, and 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 are connected successively with settling tank, anaerobic pond, anoxic pond and Aerobic Pond can merge setting, also can arrange separately, anaerobic pond can also be arranged separately, anoxic pond and Aerobic Pond merge and arrange.When Aerobic Pond and anoxic pond are provided separately, connected by internal reflux device therebetween; When Aerobic Pond and anoxic pond merge arrange time, utilize dividing plate the two to be separated, utilize the gradient bottom Aerobic Pond to realize the backflow of mud mixed liquid simultaneously, internal reflux device can not be established.
The present invention still further provides the method utilizing said apparatus synchronously to realize sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource, comprises the steps:
(1) effluent stream carries out organic matter removal and denitrogenation dephosphorizing through described A/A/O unit; The mud obtained carry out mud-water separation in described settling tank after, the anaerobic pond wherein in a part of sludge reflux to described A/A/O unit, 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 Phosphurus release pond with the mud from described anaerobic pond in described front settling tank, the supernatant liquor I produced enters in described phosphorus pond for recovering and carries out chemical phosphorus recovery, and the mud bottom described front settling tank enters described sewage sludge storage pond;
(3) described supernatant liquor I and phosphorus reclaim reagent and 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 the model, think that mud decrement is realized by ozonize completely, therefore, the sludge quantity reduced in ozonize is equal with excess sludge CER.Can estimate according to following formula for the flow of the mud of ozonize and the flow of excess sludge.
λ = σXV ηQ X d · SRT
δ = ( 1 - σ ) XV Q X d · SRT
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 drepresent the MLSS concentration (g/L) of 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), η represents the dissolution rate (change in MLSS concentration) (%) of mud in ozone treating process, and σ represents the reduction rate (%) of mud.
In above-mentioned method, the anaerobic pond sludge quantity reclaimed for phosphorus is determined by phosphoric conservation model.In the model, think that every day equals to reclaim with water outlet, excess sludge and phosphorus with the amount entering water and enter the phosphorus of system and discharges the amount of the phosphorus of system.The anaerobic pond mud discharge reclaimed for phosphorus can be estimated according to following formula.
ζ = P in - P ef - δθ X d - λ P oz η P η P P an
Wherein, ζ represents that the anaerobic pond mud discharge reclaimed for phosphorus accounts for the ratio (%) of discharge, P in, P ef, P anand P ozrepresent the phosphorus concentration (g/L) in mud supernatant liquor after water, water outlet, anaerobic supernatant and ozonize respectively, η prepresent the efficiency (%) that phosphorus reclaims, θ represents the phosphorus content (%) of excess sludge.
For the system of a steady running, P efneeds according to emission standard are determined, η, P ozand η pdetermined by sludge ozone process experiment and phosphorus recovery experiment, other parameters keep relative stability, and can determine according to the rule of thumb data in operational process.
In method of the present invention, phosphorus reclaim after sludge reflux to A/A/O unit anoxic pond, for anti-nitration reaction provides carbon source.
In above-mentioned method, in step (1), the mean 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 unit carries out in denitrogenation dephosphorizing process, nitrification liquid internal reflux ratio (in Aerobic Pond, mixed solution is to the backflow ratio in anoxic 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 ~ 0.15gO 3/ gSS, as 0.10gO 3/ gSS or 0.15gO 3/ gSS, wherein SS represents suspended solid material (suspendedsolids).
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, when using lime, ammonium salt/magnesium salts, calcium salt, the method of concrete employing crystallization carries out the recovery of phosphorus, when using aluminium salt or molysite, the concrete recovery adopting the precipitator method to carry out 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 combined successively by anaerobic biological treatment, anoxic biological treatment and Aerobic biological process; Chemical treatment technology is sludge ozone process 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 the organism in mud liquid phase, nitrogen, phosphorus are significantly increased; The partial organic substances matter be discharged in mud liquid phase is CO by ozone mineralising 2and H 2o.Sludge reflux after ozonize is to biological treatment system, and the material that microorganism utilizes mud to discharge carries out recessive growth, thus realizes mud decrement.The organism discharged in sludge ozone treating processes as denitrifying carbon source, thus can reduce the interpolation even avoiding additional carbon.In ozone treating process, the release of phosphorus makes to have very high phosphorus concentration in mud supernatant liquor, reclaims favourable to phosphorus.But the efficiency that after ozonize, mud supernatant liquor phosphorus reclaims is subject to the restriction of sludge ozone process, can not offset completely because excess sludge reduces discharging the decline of the biosystem Removal caused.PolyP bacteria under anaerobic releases phosphorus, makes to have higher phosphorus concentration in anaerobic pond mud supernatant liquor, is reclaimed can offset further because excess sludge reduces discharging the decline of the biosystem Removal caused by anaerobic pond mud supernatant liquor phosphorus.Therefore, the two combines by the present invention, after mud mixes with mud in a part of anaerobic pond after ozonize, carries out phosphorus recovery to the supernatant liquor of mixing sludge, 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, under the prerequisite ensureing wastewater treatment efficiency, achieves the reduction of discharging of excess sludge and the recovery of phosphor resource, reduces the cost of specific resistance to filtration.
The present invention, under the prerequisite keeping sewage denitrification and dephosphorization usefulness, synchronously achieves excess sludge and reduces discharging and reclamation of phosphorus resource, reduce the cost of specific resistance to filtration.
Accompanying drawing explanation
Fig. 1 is the structural representation 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:
Settling tank, 5III final settling tanks, 6 air compressor machines, 7 ozone reactors, 8 ozonizers, 9 oxygenerators, 10 Phosphurus release ponds, 11 phosphorus pond for recoverings, 12 storage basins, 13 chemicals dosing plants, 14 mechanical stirring devices before 1 tank, 2 anaerobic ponds, 3 anoxic pond, 4 Aerobic Ponds, 5I settling tank, 5II.
Fig. 2 is the schema 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 used in following embodiment if no special instructions, is ordinary method.
Material used in following embodiment, 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 synchronously realizing the device of 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 they to be separated, dividing plate are opened water hole (not shown), connect each pond successively by water hole; Aerobic Pond 4 connects settling tank 5; Anaerobic pond 2 and anoxic pond 3 install mechanical stirring device 14 respectively, lay aeration tube (not shown) in Aerobic Pond 4, connect 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 anaerobic pond 2 with ozone reactor 7 respectively; Ozonizer 8 connects the inlet mouth of ozone reactor 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, Phosphurus release pond 10 is connected with anaerobic pond 2 with the mud discharging mouth of ozone reactor 7.Phosphurus 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 thickened sludge of front settling tank 5II and the supernatant liquor of final settling tanks 5III enter in storage basin 12.Storage basin 12 is connected with anoxic pond 3.In Phosphurus release pond 10, phosphorus pond for recovering 11 and storage basin 12, mechanical stirring device 14 is all installed.
Embodiment 2, synchronously realize sewage denitrification and dephosphorization, excess sludge reduction and phosphorus reclaim method
Utilize the device that embodiment 1 provides, synchronously realize sewage denitrification and dephosphorization, excess sludge reduction and phosphorus and reclaim, technical process as shown in Figure 2.
Sewage in tank 1 enters into anaerobic pond 2 and carries out the release of phosphorus and the ammonification of partial organic substances together with the returned sluge in settling tank 5I.Enter anoxic pond 3 together with the nitrification liquid that mixed solution and the Aerobic Pond 4 of anaerobic pond 2 reflux and carry out denitrification denitrogenation.The mixed solution of anoxic pond 3 enters the excessive consumption 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, and supernatant liquor discharges, 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 Phosphurus release pond 10 and mixes with the mud of a part from anaerobic pond 2, and then enter into front settling tank 5II and carry out mud-water separation, 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, reclaims phosphorus with the form of calcium phosphate precipitation.Mud bottom front settling tank 5II enters storage basin 12 together with the supernatant liquor of final settling tanks 5III, after mixing wherein, is back in anoxic pond 3.The organism be discharged in sludge ozone treating processes in supernatant liquor can as the carbon source of anti-nitration reaction in anoxic pond 3.
By aforesaid method, while the dirty Organic substance in water of removal, nitrogen, phosphorus, achieve the decrement discharge of excess sludge, reduce the cost of specific resistance to filtration, reduce and even avoid adding of anoxic pond additional carbon, achieve the recovery of phosphor resource.
The process of embodiment 3, synthetic sanitary sewage
Test according to the method in embodiment 2, test conditions and result as follows:
Average water quality: COD of intaking is 350mg/L, TN is 35mg/L, NH 3-N is 35mg/L, TP is 3mg/L.In A/A/O bio-reactor, mean 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 is 100% to the nitrification liquid internal reflux ratio of anoxic pond, SRT=25d, the MLSS concentration of excess sludge is about 8.1g/L.Ozone dosage is 0.10gO 3/ gSS, mud dissolution rate is 35%, λ=1.8%, and 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 be 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%.The phosphorus entering in water about 60% is recycled.
Sewage disposal in embodiment 4, municipal sewage plant
Test according to the method in embodiment 2, test conditions and result as follows
Average water quality: COD of intaking is 395mg/L, SS is 150mg/L, NH 3-N is 35mg/L, TN be 72mg/L, TP is 6mg/L.In A/A/O bio-reactor, mean 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 is 200% to the internal reflux ratio of anoxic pond, SRT=25d, the MLSS concentration of excess sludge is about 7.8g/L.Ozone dosage is 0.15gO 3/ gSS, mud dissolution rate is 38%, λ=2.2%, and 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, SS is 5mg/L, NH 3-N is 1.5mg/L, TN be 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%.The phosphorus entering in water about 55% 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, is included within 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 the ozone reactor and ozonizer that are connected;
Described phosphorus recovery unit comprises Phosphurus release pond, front settling tank, phosphorus pond for recovering, final settling tanks and sewage sludge storage pond; Described Phosphurus release pond, front settling tank, phosphorus pond for recovering are communicated with successively with final settling tanks, 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 the settling tank in described A/A/O unit is connected with the mud inlet of described ozone reactor;
Settling tank bottom in described A/A/O unit is connected with anaerobic pond;
Described Phosphurus release pond is connected with described anaerobic pond with the mud discharging mouth 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. described in claim 1 or 2, synchronously realize the application of device in sewage disposal of sewage denitrification and dephosphorization, excess sludge reduction and reclamation of phosphorus resource
4. 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 carries out organic matter removal and denitrogenation dephosphorizing through described A/A/O unit; The mud obtained carry out mud-water separation in described settling tank after, the anaerobic pond wherein in a part of sludge reflux to described A/A/O unit, 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 Phosphurus release pond with the mud from described anaerobic pond in described front settling tank, the supernatant liquor I produced enters in described phosphorus pond for recovering and carries out chemical phosphorus recovery, and the mud of bottom enters described sewage sludge storage pond;
(3) described supernatant liquor I and phosphorus reclaim reagent and 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.
5. method according to claim 4, is characterized in that: in step (1), and the mean sludge concentration in described A/A/O unit is 3 ~ 4g/L;
In Aerobic Pond in described A/A/O unit, sludge concentration is 3 ~ 4g/L;
Described A/A/O unit carries out in the process of denitrogenation dephosphorizing, and nitrification liquid internal reflux ratio is 100% ~ 200%, and return sludge ratio is 25% ~ 100%.
6. the method according to claim 4 or 5, is characterized in that: in step (2), and in described ozonize cell processing process, the dosage of ozone is 0.1 ~ 0.15gO 3/ gSS, wherein SS represents suspended solid material.
7. the method according to claim 4 or 5, is characterized in that: in step (3), and it is at least one in lime, calcium salt, ammonium salt/magnesium salts, aluminium salt and molysite that described phosphorus reclaims reagent; Described ammonium salt/magnesium salts is the mixture of ammonium salt and magnesium salts.
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