CN109626570A - A kind of preposition phosphorus removing method of vivianite crystallization based on AAO/AO technique - Google Patents
A kind of preposition phosphorus removing method of vivianite crystallization based on AAO/AO technique Download PDFInfo
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Abstract
The invention discloses a kind of, and the vivianite based on AAO/AO technique crystallizes preposition phosphorus removing method, belongs to technical field of sewage.The phosphorus removing method step are as follows: the raw sewage anaerobic pond into AAO/AO technique synchronous with the sludge to flow back from secondary settling tank carries out releasing phosphorus, and Fe is added in anaerobic pond3+/Fe2+Salt, Fe3+Fe is reduced under the action of alienation metal reducing miroorganisms2+, Fe2+Vivianite crystallization is generated with the phosphorus reaction in anaerobic pond, the anaerobism that one is connected to anaerobic pond, which is equipped with, in anaerobic pond rear end stands area, muddy water mixed solution containing a large amount of vivianites enters anaerobism and stands area's sedimentation separation, wherein, the sludge containing a large amount of vivianites that anaerobism stands area bottom is fallen to through sludge pipe discharge system, the supernatant for isolating vivianite sludge enters the follow-up phase of AAO/AO technique and handled.The method of the present invention is simple and easy, and substantially without additional processing unit is increased, at low cost and phosphor-removing effect is good.
Description
Technical field
The present invention relates to a kind of phosphorus removing methods, and in particular to a kind of preposition dephosphorization of vivianite crystallization based on AAO/AO technique
Method belongs to technical field of sewage.
Background technique
Phosphorus is the important element for causing water eutrophication, therefore with the pay attention to day by day protected to water body environment, country
3.0mg/L also higher and higher to the processing requirement of sewage treatment plant's phosphorus, requiring from secondary discharge standard, is transitioned into level-one B and wants
The 1.0mg/L asked, to the 0.5mg/L of the current first level A largely executed.Under there is a requirement that, various dephosphorization process also by
It researches and develops and applies, such as bioanalysis, chemical precipitation method.Common Biological Phosphorus Removal Processes are AO or AAO technique, existing AO dephosphorization process
(as shown in Figure 3) includes anaerobic pond, aerobic tank and secondary settling tank, when AO process operation, raw sewage with flow back from secondary settling tank it is phosphorous
The synchronous anaerobic pond that enters of sludge carries out releasing phosphorus, while partial organic substances carry out ammonification, and the muddy water mixed solution after releasing phosphorus enters aerobic
Pond carries out the absorption of nitration reaction and phosphorus, achievees the purpose that system dephosphorization finally by secondary sedimentation tank discharge excess sludge；It is existing
AAO dephosphorization process is to add an anoxic pond in AO dephosphorization process, and a part of mixed liquor that aerobic tank flows out is back to anoxic
Pond front end, to achieve the purpose that denitrogenation.AO or AAO technique is used due to operating cost is lower by most of sewage treatment plant, but
Single bioanalysis has been difficult to meet increasingly strict dephosphorization requirement, therefore chemical method becomes the hand of checking on of sewage treatment plant's dephosphorization
Section.
About chemical dephosphorization, there are many reports at present, as the Chinese invention patent of Publication No. CN101381184A discloses
Sewage disposal system and processing method of the biological phosphate-eliminating in conjunction with dypass chemical dephosphorization, the phosphorus removing method need additional to increase side
Flow dephosphorization processing unit, complicated for operation and higher cost；The Chinese invention patent of Publication No. CN1654352A discloses one kind
Urban sewage chemical-biologic composite deep phosphorous removal System and method for, this method synchronous chemical flocculation and biology directly in aeration tank
Dephosphorization, dephosphorization can change the characteristic of biological sludge directly in aeration tank, influence the effect of dephosphorization；Publication No.
The patent of invention of CN105923761A discloses a kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization sludge, directly exists
Denitrification section adds Fe2+Although reinforced phosphor-removing effect, use this method existing AAO technique can be run to a certain extent
When, since sludge age influences the activated sludge very big, denitrogenation needs sludge age long, the work that dephosphorization needs sludge age short on Nitrogen/Phosphorus Removal
Property sludge, contradiction between the two make the phosphor-removing effect of this method unsatisfactory, it is difficult to improve again.
Summary of the invention
For the problems of the prior art, the present invention provides a kind of preposition dephosphorization of vivianite crystallization based on AAO/AO technique
Method, this method is simple and easy, and substantially without additional processing unit is increased, at low cost and phosphor-removing effect is good.
To realize the above technical purpose, the technical scheme is that
A kind of preposition phosphorus removing method of vivianite crystallization based on AAO/AO technique, step are as follows: raw sewage is returned with from secondary settling tank
The synchronous anaerobic pond for entering AAO/AO technique of the sludge of stream carries out releasing phosphorus, and Fe is added in anaerobic pond3+/ Fe2+Salt, Fe3+Different
Fe is reduced under the action of change metal reducing miroorganisms2+, Fe2+Vivianite crystallization is generated with the phosphorus reaction in anaerobic pond, in anaerobic pond
Rear end is equipped with the anaerobism that one is connected to anaerobic pond and stands area, and it is heavy that the muddy water mixed solution containing a large amount of vivianites enters anaerobism standing area
Drop separation, wherein the sludge containing a large amount of vivianites for falling to anaerobism standing area bottom is discharged through sludge pipe, isolates Lan Tie
The follow-up phase that the supernatant of mine sludge enters AAO/AO technique is handled.
Preferably, the Fe3+/Fe2+The dosage of salt is Fe3+/Fe2+With anaerobic pond water inlet total phosphorus concentration TP's
Molar ratio is 1.0~1.5.
Preferably, the anaerobism stands the residence time of muddy water mixed solution in area as 15~30min.
Preferably, largely enter the anaerobic pond of AAO/AO technique from the sludge that secondary settling tank flows back, small part into
Enter the aerobic tank of AAO/AO technique, wherein the sludge reflux amount into aerobic tank is 20%.
Compared with prior art, the present invention has following advantages:
1. the present invention is on the basis of the AAO/AO dephosphorization process of existing operation, by adding Fe in anaerobic pond3+/Fe2 +Salt, the water environment for being 6~9 using phosphorus rich in anaerobic processes, high-speed rail, reproducibility and reaction pH, carries anaerobic pond water inlet
The phosphorus that polyP bacteria discharges in phosphorus and anaerobic processes is changed into the form of existing for vivianite (as shown in reaction equation I-III), and passes through
In anaerobic pond rear end, setting anaerobism stands the sludge discharge system that will contain a large amount of vivianites in area, it is possible to reduce the processing of subsequent phosphorus
Load strengthens the removal effect to phosphor in sewage, realizes the recycling of phosphorus, while can also partially reduce subsequent denitrogenation dephosphorizing to carbon source
Competition, improve to the denitrification effect of sewage；
Fe3+→Fe2+(Ⅰ)
3Fe2++2HPO4 2-+8H2O→Fe3(PO4)·8H2O↓+2H+(Ⅱ)
3Fe2++2PO4 3-+8H2O→Fe3(PO4)·8H2O↓(Ⅲ)
2. vivianite property is stablized, only in room temperature, O2It just can slowly be aoxidized under conditions of being coexisted with illumination three,
Therefore in an anaerobic environment in the form of vivianite existing for phosphorus be not easy to be released again, be conducive to the recycling of phosphorus；
It, both can be in existing sewage treatment substantially without additional processing unit is increased 3. the method for the present invention is simple and easy
Factory is easy to implement, can also implement in newly-built sewage treatment plant, applied widely.
4. the molysite that the present invention adds raw material from a wealth of sources is easy to get, and the molysite added also promotes to make to subsequent bio
With the treatment effect of system can be improved.
5. general denitrogenation needs longer sludge age to meet the needs of nitrifier, dephosphorization according to the principle of denitrogenation dephosphorizing
Shorter sludge age is needed to achieve the purpose that realize biological phosphate-eliminating by spoil disposal, and the preposition dephosphorization of the present invention can reduce AAO/AO
The sludge age contradictory problems of technique synchronous denitrification dephosphorizing.
6. the present invention can solve by the way that the sludge part in existing AAO/AO technique secondary settling tank to be back in aerobic tank
The problem that preposition dephosphorization causes the sludge concentration in the aerobic tank of AAO/AO technique lower, meets the sludge concentration in aerobic tank.
Detailed description of the invention
Fig. 1 is the flow chart that the vivianite based on AAO technique crystallizes preposition dephosphorization；
Fig. 2 is the flow chart that the vivianite based on AO technique crystallizes preposition dephosphorization；
Fig. 3 is the flow chart of existing AO dephosphorization process.
Specific embodiment
Below by examples of implementation, the characteristics of the present invention is further explained, but claim of the invention is not done any
It limits.
Embodiment 1:
A kind of vivianite based on AAO technique crystallizes preposition phosphorus removing method, step are as follows: raw sewage (water inlet) and all from two
The synchronous anaerobic pond for entering AAO technique of sludge of heavy pond reflux carries out releasing phosphorus, and Fe is added in anaerobic pond2+Salt, Fe2+With anaerobism
Phosphorus (phosphorus of polyP bacteria release in the phosphorus and anaerobic processes that water inlet carries) reaction in pond generates vivianite crystallization, after anaerobic pond
End is equipped with the anaerobism that one is connected to anaerobic pond and stands area, and the muddy water mixed solution containing a large amount of vivianites enters anaerobism and stands area's sedimentation
Separation, wherein the sludge containing a large amount of vivianites for falling to anaerobism standing area bottom is discharged through sludge pipe, isolates vivianite
The follow-up phase that the supernatant of sludge enters AAO technique is handled；
During above-mentioned dephosphorization, water inlet total phosphorus concentration TP is 5mg/L, the Fe added2+With anaerobic pond water inlet total phosphorus concentration
The molar ratio of TP is 1.0, anaerobic pond hydraulic detention time 2h, and it is 15min that anaerobism, which stands area's hydraulic detention time, runs one
Month, sludge character is good, and two precipitating water outlet TP, which stablize, is lower than 0.2mg/L.
Embodiment 2:
A kind of vivianite based on AAO technique crystallizes preposition phosphorus removing method, step are as follows: raw sewage with all from secondary settling tank time
The synchronous anaerobic pond for entering AAO technique of the sludge of stream carries out releasing phosphorus, and Fe is added in anaerobic pond3+Salt, Fe3+Alienation metal also
Fe is reduced under the action of opportunistic pathogen2+, Fe2+(polyP bacteria discharges in the phosphorus and anaerobic processes that water inlet carries with the phosphorus in anaerobic pond
Phosphorus) reaction generates vivianite crystallization, be equipped with the anaerobism that be connected to anaerobic pond in anaerobic pond rear end and stand area, contain largely indigo plant
The muddy water mixed solution of iron ore enters anaerobism and stands area's sedimentation separation, wherein it is a large amount of blue to fall to containing for anaerobism standing area bottom
The sludge of iron ore is discharged through sludge pipe, and the supernatant for isolating vivianite sludge enters the follow-up phase of AAO technique and handled；
During above-mentioned dephosphorization, water inlet total phosphorus concentration TP is 5mg/L, the Fe added3+With anaerobic pond water inlet total phosphorus concentration
The molar ratio of TP is 1.0, anaerobic pond hydraulic detention time 3h, and it is 30min that anaerobism, which stands area's hydraulic detention time, runs one
Month, sludge character is good, and water outlet TP, which stablizes, is lower than 0.2mg/L.
Embodiment 3:
A kind of vivianite based on AAO technique crystallizes preposition phosphorus removing method, step are as follows: raw sewage with all from secondary settling tank time
The synchronous anaerobic pond for entering AAO technique of the sludge of stream carries out releasing phosphorus, and Fe is added in anaerobic pond2+Salt, Fe2+In anaerobic pond
Phosphorus (phosphorus of polyP bacteria release in the phosphorus and anaerobic processes that water inlet carries) reaction generates vivianite crystallization, is equipped in anaerobic pond rear end
One anaerobism being connected to anaerobic pond stands area, and the muddy water mixed solution containing a large amount of vivianites enters anaerobism and stands area's sedimentation separation,
Wherein, the sludge containing a large amount of vivianites of anaerobism standing area bottom is fallen to through sludge pipe discharge system, isolates vivianite
The follow-up phase that the supernatant of sludge enters AAO technique is handled；
During above-mentioned dephosphorization, water inlet total phosphorus concentration TP is 5mg/L, Fe2+With rubbing for anaerobic pond water inlet total phosphorus concentration TP
You are than being 1.5, anaerobic pond hydraulic detention time 2h, and it is 15min that anaerobism, which stands area's hydraulic detention time, runs one month, sludge
Character is good, and water outlet TP, which stablizes, is lower than 0.2mg/L.
Embodiment 4:
A kind of vivianite based on AO technique crystallizes preposition phosphorus removing method, step are as follows: raw sewage with all from secondary settling tank time
The synchronous anaerobic pond for entering AO technique of the sludge of stream carries out releasing phosphorus, and Fe is added in anaerobic pond2+Salt, Fe2+In anaerobic pond
Phosphorus (phosphorus of polyP bacteria release in the phosphorus and anaerobic processes that water inlet carries) reaction generates vivianite crystallization, is equipped in anaerobic pond rear end
One anaerobism being connected to anaerobic pond stands area, and the muddy water mixed solution containing a large amount of vivianites enters anaerobism and stands area's sedimentation separation,
Wherein, the sludge containing a large amount of vivianites for falling to anaerobism standing area bottom is discharged through sludge pipe, isolates vivianite sludge
Supernatant enter the follow-up phase of AO technique and handled；
During above-mentioned dephosphorization, water inlet total phosphorus concentration TP is 5mg/L, Fe2+With rubbing for anaerobic pond water inlet total phosphorus concentration TP
You are than being 1.5, anaerobic pond hydraulic detention time 2h, and it is 15min that anaerobism, which stands area's hydraulic detention time, runs one month, sludge
Character is good, and water outlet TP, which stablizes, is lower than 0.2mg/L.
Embodiment 5:
A kind of vivianite based on AO technique crystallizes preposition phosphorus removing method, step are as follows: raw sewage with all from secondary settling tank time
The synchronous anaerobic pond for entering AO technique of the sludge of stream carries out releasing phosphorus, and Fe is added in anaerobic pond3+Salt, Fe3+Alienation metal also
Fe is reduced under the action of opportunistic pathogen2+,Fe2+(polyP bacteria discharges in the phosphorus and anaerobic processes that water inlet carries with the phosphorus in anaerobic pond
Phosphorus) reaction generates vivianite crystallization, be equipped with the anaerobism that be connected to anaerobic pond in anaerobic pond rear end and stand area, contain largely indigo plant
The muddy water mixed solution of iron ore enters anaerobism and stands area's sedimentation separation, wherein it is a large amount of blue to fall to containing for anaerobism standing area bottom
The sludge of iron ore is discharged through sludge pipe, and the supernatant for isolating vivianite sludge enters the follow-up phase of AO technique and handled；
During above-mentioned dephosphorization, water inlet total phosphorus concentration TP is 5mg/L, Fe2+With rubbing for anaerobic pond water inlet total phosphorus concentration TP
You are than being 1.0, anaerobic pond hydraulic detention time 3h, and it is 30min that anaerobism, which stands area's hydraulic detention time, runs one month, sludge
Character is good, and water outlet TP, which stablizes, is lower than 0.2mg/L.
Embodiment 6:
A kind of vivianite based on AAO technique crystallizes preposition phosphorus removing method, step are as follows: raw sewage (water inlet) with largely from
The synchronous anaerobic pond for entering AAO technique of the sludge of secondary settling tank reflux carries out releasing phosphorus, and Fe is added in anaerobic pond2+Salt, Fe2+With detest
Phosphorus (phosphorus of polyP bacteria release in the phosphorus and anaerobic processes that water inlet carries) reaction in oxygen pond generates vivianite crystallization, in anaerobism
Pond rear end is equipped with the anaerobism that one is connected to anaerobic pond and stands area, and the muddy water mixed solution containing a large amount of vivianites enters anaerobism and stands area
Sedimentation separation, wherein the sludge containing a large amount of vivianites for falling to anaerobism standing area bottom is discharged through sludge pipe, isolates indigo plant
The follow-up phase that the supernatant of iron ore sludge enters AAO technique is handled；
During above-mentioned dephosphorization, the sludge to flow back from secondary settling tank is divided into two parts, most of anaerobism for entering AAO technique
Pond, the sludge reflux amount that small part enters the aerobic tank of AAO technique, and enters aerobic tank are 20%；
During above-mentioned dephosphorization, water inlet total phosphorus concentration TP is 5mg/L, the Fe added2+With anaerobic pond water inlet total phosphorus concentration
The molar ratio of TP is 1.0, anaerobic pond hydraulic detention time 2h, and it is 15min that anaerobism, which stands area's hydraulic detention time, runs one
Month, sludge character is good, and two precipitating water outlet TP, which stablize, is lower than 0.2mg/L.
Embodiment 7:
A kind of vivianite based on AO technique crystallizes preposition phosphorus removing method, step are as follows: raw sewage (water inlet) with largely from
The synchronous anaerobic pond for entering AO technique of the sludge of secondary settling tank reflux carries out releasing phosphorus, and Fe is added in anaerobic pond2+Salt, Fe2+With anaerobism
Phosphorus (phosphorus of polyP bacteria release in the phosphorus and anaerobic processes that water inlet carries) reaction in pond generates vivianite crystallization, in anaerobic pond
Rear end is equipped with the anaerobism that one is connected to anaerobic pond and stands area, and it is heavy that the muddy water mixed solution containing a large amount of vivianites enters anaerobism standing area
Drop separation, wherein the sludge containing a large amount of vivianites for falling to anaerobism standing area bottom is discharged through sludge pipe, isolates Lan Tie
The follow-up phase that the supernatant of mine sludge enters AO technique is handled；
During above-mentioned dephosphorization, the sludge to flow back from secondary settling tank is divided into two parts, most of anaerobism for entering AO technique
Pond, the sludge reflux amount that small part enters the aerobic tank of AO technique, and enters aerobic tank are 20%；
During above-mentioned dephosphorization, water inlet total phosphorus concentration TP is 5mg/L, the Fe added2+With anaerobic pond water inlet total phosphorus concentration
The molar ratio of TP is 1.0, anaerobic pond hydraulic detention time 2h, and it is 15min that anaerobism, which stands area's hydraulic detention time, runs one
Month, sludge character is good, and two precipitating water outlet TP, which stablize, is lower than 0.2mg/L.
Comparative example 1:
Using existing AAO technique, water inlet total phosphorus concentration TP is 5mg/L, anaerobic pond hydraulic detention time 2.25h, operation one
A month, two to be settled out horizontal total phosphorus concentration be 0.51mg/L.
Comparative example 2:
Using existing AO technique, water inlet total phosphorus concentration TP is 5mg/L, anaerobic pond hydraulic detention time 2.25h, runs one
Month, two to be settled out horizontal total phosphorus concentration be 0.58mg/L.
Comparative example 3:
Using the reinforced phosphor-removing method in the patent of invention of Publication No. CN105923761A and existing AAO technique is run,
Total phosphorus concentration TP of intaking is 5mg/L, Fe2+Molar ratio with anaerobic pond water inlet total phosphorus concentration TP is 0.5, when anaerobic pond hydraulic retention
Between 2.25h, run one month, water outlet TP average phosphorous concentration be 0.41mg/L.
It is understood that being merely to illustrate the present invention above with respect to specific descriptions of the invention and being not limited to this
Technical solution described in inventive embodiments.Those skilled in the art should understand that still can be carried out to the present invention
Modification or equivalent replacement, to reach identical technical effect；As long as meet use needs, all protection scope of the present invention it
It is interior.
Claims (4)
1. a kind of vivianite based on AAO/AO technique crystallizes preposition phosphorus removing method, which is characterized in that step are as follows: raw sewage with from
The synchronous anaerobic pond for entering AAO/AO technique of the sludge of secondary settling tank reflux carries out releasing phosphorus, and Fe is added in anaerobic pond3+/Fe2+Salt,
Fe3+Fe is reduced under the action of alienation metal reducing miroorganisms2+, Fe2+Vivianite crystallization is generated with the phosphorus reaction in anaerobic pond,
The anaerobism that one is connected to anaerobic pond is equipped in anaerobic pond rear end and stands area, and the muddy water mixed solution containing a large amount of vivianites enters anaerobism
Standing area's sedimentation separation, wherein the sludge containing a large amount of vivianites for falling to anaerobism standing area bottom is discharged through sludge pipe, point
The supernatant for separating out vivianite sludge enters the follow-up phase of AAO/AO technique and is handled.
2. the vivianite based on AAO/AO technique crystallizes preposition phosphorus removing method as described in claim 1, which is characterized in that described
Fe3+/Fe2+The dosage of salt is Fe3+/Fe2+Molar ratio with anaerobic pond water inlet total phosphorus concentration TP is 1.0~1.5.
3. the vivianite based on AAO/AO technique crystallizes preposition phosphorus removing method as described in claim 1, which is characterized in that described
The residence time that anaerobism stands muddy water mixed solution in area is 15~30min.
4. the vivianite based on AAO/AO technique crystallizes preposition phosphorus removing method as described in claim 1, which is characterized in that from two
The sludge of heavy pond reflux largely enters the anaerobic pond of AAO/AO technique, and small part enters the aerobic tank of AAO/AO technique, wherein
Sludge reflux amount into aerobic tank is 20%.
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| CN111943444A (en) * | 2020-08-19 | 2020-11-17 | 苏州科技大学 | Sewage treatment device and method for enhancing municipal sewage autotrophic nitrogen removal and synchronous phosphorus recovery |
| CN112279478A (en) * | 2020-10-23 | 2021-01-29 | 国河环境研究院(南京)有限公司 | Method for recovering phosphorus in excess sludge in form of vivianite |
| CN112645447A (en) * | 2020-11-30 | 2021-04-13 | 苏州科技大学 | System and process for recycling vivianite from phosphorus-containing wastewater |
| CN113493245A (en) * | 2021-05-06 | 2021-10-12 | 北京工业大学 | Method for culturing anaerobic ammonia oxidation granular sludge with vivianite core |
| CN113666498A (en) * | 2021-08-06 | 2021-11-19 | 同济大学 | Ferrocyanite separation and kieselguhr recovery device and method for enhanced nitrogen and phosphorus removal system |
| WO2022022090A1 (en) * | 2020-07-29 | 2022-02-03 | 同济大学 | Method for recovering vivianite from sludge incineration ash |
| CN114409101A (en) * | 2022-03-31 | 2022-04-29 | 北京林业大学 | Nitrogen and phosphorus removal sewage treatment system and method based on iron reduction and oxidation circulation |
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| WO2022022090A1 (en) * | 2020-07-29 | 2022-02-03 | 同济大学 | Method for recovering vivianite from sludge incineration ash |
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| CN113493245B (en) * | 2021-05-06 | 2022-11-22 | 北京工业大学 | Method for culturing anaerobic ammonia oxidation granular sludge with vivianite core |
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Application publication date: 20190416 |