CN108609820A - The method and its system of chemical strengthening primary sludge resource recycling - Google Patents
The method and its system of chemical strengthening primary sludge resource recycling Download PDFInfo
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- CN108609820A CN108609820A CN201810455379.3A CN201810455379A CN108609820A CN 108609820 A CN108609820 A CN 108609820A CN 201810455379 A CN201810455379 A CN 201810455379A CN 108609820 A CN108609820 A CN 108609820A
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- edta
- chemical strengthening
- primary sludge
- resource recycling
- strengthening primary
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The present invention relates to field of solid waste treatment, specifically, providing a kind of method and its system of chemical strengthening primary sludge resource recycling.The method of the chemical strengthening primary sludge resource recycling uses EDTA or edta salt that the metal ion in chemical strengthening primary sludge is adjusted first, then carries out anaerobic fermentation and phosphorus recycling successively.This method utilizes EDTA or the good complexing power of edta salt, with the organic matter and PO in sludge4 3‑Metal ion is competed, stable EDTA metal ion complexes are formed, to make organic matter and PO4 3‑It is released, has both improved the anaerobic acid-production rate of CEPSS, while can also recycle phosphorus by guanite method etc..The above method can recycle the resources such as volatile acid and phosphate fertilizer simultaneously, realize the minimizing of CEPSS and the comprehensive utilization of resource, while also laying a good foundation for the extensive use of chemical strengthening primary treatment technology.
Description
Technical field
The present invention relates to field of solid waste treatment, are returned in particular to a kind of chemical strengthening primary sludge resource
Receive the method and its system utilized.
Background technology
In the primary stage of sewage disposal, FeCl is added3、Al2(SO4)3Equal coagulant are dirty to strengthen bulky grain in water removal
Object, organic matter, phosphorus and antibiotics resistance gene are contaminated, the water process skill of the pollutional load and energy consumption of two stage biological processing is reduced
Art is exactly chemical strengthening primary treatment.The technology has many advantages, such as that operating cost is low, Operation and Maintenance is simple, Hong Kong, the U.S. with
And it is applied in some large-scale wastewater treatment plants in Shanghai.However, compared with traditional primary sludge, chemical strengthening is primary
Processing sludge (or chemical strengthening primary sludge, Chemical Enhanced Primary Sedimentation Sludge,
CEPSS) contain a large amount of metallic salt, seriously affect its subsequent resource recycling.
It is carried out in primary reinforcement processing procedure using molysite, Fe (III) passes through the glue in charge neutrality effect and sludge/sewage
Body microparticle surfaces chemically react, and neutralization sludge colloidal particles itself institute is electrically charged, promotes sludge particles agglomerate to be formed big
Particle flco, therefore the Fe (III) in CEPSS combines closely with organic matter, hinders the release of organic matter, and then cause organic
Object is difficult to contact and degraded with anaerobe.Some researches show that, can be to anaerobism when Fe (III) concentration reaches certain restrictions
Microorganism generates inhibition or toxic action, reduces anaerobic acid-production methane phase efficiency and its stability.Fe (III) excessive concentration can be led
Oxidation-reduction potential (Oxidation Reduction Potential, ORP) is caused to reduce, Fe (III) cannot be reduced into Fe
(II), the organic matter in CEPSS is caused still to be combined closely with Fe (III), limitation can utilize contact of the substrate with anaerobe,
Anaerobic fermentation is caused to fail.
In view of this, special propose the present invention.
Invention content
The first object of the present invention is to provide a kind of method of chemical strengthening primary sludge resource recycling, this method
The resources such as volatile acid and phosphate fertilizer can be recycled, realize the minimizing of CEPSS and the comprehensive utilization of resource.
The second object of the present invention is to provide a kind of system of chemical strengthening primary sludge resource recycling, the system
Setting is reasonable, and the resources such as volatile acid and phosphate fertilizer can be recycled using the system, realizes the minimizing of CEPSS and the comprehensive profit of resource
With.
In order to realize that the above-mentioned purpose of the present invention, spy use following technical scheme：
In a first aspect, the present invention provides a kind of method of chemical strengthening primary sludge resource recycling, use first
The metal ion in chemical strengthening primary sludge is adjusted in EDTA or edta salt, then carries out anaerobic fermentation successively and phosphorus returns
It receives.
As further preferred technical solution, a concentration of 150- of EDTA or edta salt when EDTA or edta salt are adjusted
250mg/L。
As further preferred technical solution, stir speed (S.S.) when EDTA or edta salt are adjusted is 45-55rad/min.
As further preferred technical solution, hydraulic detention time when EDTA or edta salt are adjusted is 8-12min.
As further preferred technical solution, pH when carrying out anaerobic fermentation is 7.0 ± 0.5.
As further preferred technical solution, stirring technique when anaerobic fermentation is：Stir speed (S.S.) 45-55rad/min, is stirred
12-18min, mixing time 3-7min are divided between mixing.
As further preferred technical solution, sludge retention time is 8-12 days when anaerobic fermentation, temperature when anaerobic fermentation
Degree is 30-40 DEG C.
As further preferred technical solution, pH when phosphorus recycles is 9.5-10.5.
As further preferred technical solution, the metal ion is Fe3+And/or Al3+。
Second aspect, the present invention provides a kind of systems of chemical strengthening primary sludge resource recycling, including successively
Connected chemical strengthening primary sludge pond, EDTA regulating reservoirs or edta salt regulating reservoir, anaerobic fermentation reaction tank and phosphorus recovery device.
Compared with prior art, beneficial effects of the present invention are：
The method of chemical strengthening primary sludge resource recycling provided by the invention is by using EDTA or edta salt pair
(or to be complexed) is adjusted in metal ion in chemical strengthening primary sludge, utilizes EDTA or the good complexing energy of edta salt
Organic matter in power, with sludge and PO4 3-Metal ion is competed, stable EDTA- metal ion complexes are formed, to make have
Machine object and PO4 3-Etc. being released, the anaerobic acid-production rate of CEPSS has both been improved, while can also pass through guanite method etc. and recycle phosphorus.
In addition, EDTA- metal ion complexes can be absorbed and utilized as nutrient by anaerobic acid-production bacterium, crucial acid-producing bacteria is improved
Metal enzymatic activity, and then improve anaerobism rate.Therefore, the above method can recycle the resources such as volatile acid and phosphate fertilizer simultaneously, realize
The minimizing of CEPSS and the comprehensive utilization of resource, while also base has been established for the extensive use of chemical strengthening primary treatment technology
Plinth.
The system setting of chemical strengthening primary sludge resource recycling provided by the invention is reasonable, can using the system
The resources such as volatile acid and phosphate fertilizer are recycled, realize the minimizing of CEPSS and the comprehensive utilization of resource.
Description of the drawings
Fig. 1 is anti-when being recycled using the method for chemical strengthening primary sludge resource recycling provided by the invention
Answer principle schematic；
Fig. 2 is the schematic diagram of the method for chemical strengthening primary sludge resource recycling provided by the invention；
Fig. 3 is COD concentration variation diagrams when handling by EDTA and is unprocessed；
Fig. 4 is volatile acid concentration variation diagram when handling by EDTA and is unprocessed；
Fig. 5 is phosphate concn variation diagram when handling by EDTA and is unprocessed.
Specific implementation mode
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person carries out according to conventional conditions or manufacturer's recommended conditions.
In a first aspect, as depicted in figs. 1 and 2, providing a kind of chemical strengthening primary sludge resource in some embodiments
The method of recycling uses EDTA or edta salt that the metal ion in chemical strengthening primary sludge is adjusted, so first
Carry out anaerobic fermentation and phosphorus recycling successively afterwards.
The method of above-mentioned chemical strengthening primary sludge resource recycling is by using EDTA
(Ethylenediaminetetraacetic acid, ethylenediamine tetra-acetic acid) or edta salt are in chemical strengthening primary sludge
(or to be complexed) is adjusted in metal ion, using EDTA or the good complexing power of edta salt, with the organic matter in sludge
And PO4 3-Metal ion is competed, stable EDTA- metal ion complexes are formed, to make organic matter and PO4 3-It is released,
Both the anaerobic acid-production rate of CEPSS had been improved, while can also recycle phosphorus by guanite method etc..In addition, EDTA- complexing of metal ion
Object can be absorbed and utilized as nutrient by anaerobic acid-production bacterium, improve the metal enzymatic activity of crucial acid-producing bacteria, and then improve and detest
Oxygen rate.Therefore, the above method can recycle the resources such as volatile acid and phosphate fertilizer simultaneously, realize minimizing and the resource of CEPSS
Comprehensive utilization, while also laying a good foundation for the extensive use of chemical strengthening primary treatment technology.
In a preferred embodiment, a concentration of 150- of EDTA or edta salt when EDTA or edta salt are adjusted
250mg/L.The concentration of above-mentioned EDTA or edta salt it is typical but non-limiting for 150mg/L, 160mg/L, 170mg/L,
180mg/L, 190mg/L, 200mg/L, 210mg/L, 220mg/L, 230mg/L, 240mg/L or 250mg/L.Above-mentioned EDTA or
The concentration of edta salt is preferably 180-110mg/L, further preferably 200mg/L.This preferred embodiment is by optimizing EDTA
Or edta salt concentration, the metal ion in chemical strengthening primary sludge can be made as fully as possible by EDTA or edta salt network
It closes, to largely release organic matter and PO4 3-Deng improving the recycling efficiency of phosphate fertilizer.
In a preferred embodiment, stir speed (S.S.) when EDTA or edta salt are adjusted is 45-55rad/min.On
It is 45rad/min, 46rad/min, 47rad/min, 48rad/min, 49rad/ that it is typical but non-limiting, which to state stir speed (S.S.),
Min, 50rad/min, 51rad/min, 52rad/min, 53rad/min, 54rad/min or 55rad/min.Above-mentioned stir speed (S.S.)
Preferably 47-52rad/min, further preferably 50rad/min.Stirring speed when by optimizing EDTA or edta salt adjusting
Rate improves the complexing rate of EDTA or edta salt, reduces the reaction time.
In a preferred embodiment, hydraulic detention time when EDTA or edta salt are adjusted is 8-12min.It is above-mentioned
Hydraulic detention time it is typical but non-limiting for 8min, 8.5min, 9min, 9.5min, 10min, 10.5min, 11min,
11.5min or 12min.Above-mentioned hydraulic detention time is preferably 9-11min, further preferably 10min.In the hydraulic retention
Between be conducive to intensified response effect in range, improve organic matter and PO4 3-Deng releasing effect.
In a preferred embodiment, pH when carrying out anaerobic fermentation is 7.0 ± 0.5.Above-mentioned pH typical cases but non-limit
Property processed is 6.5,6.6,6.7,6.8,6.9,7,7.1,7.2,7.3,7.4 or 7.5.Above-mentioned pH be suitble to anaerobic fermentation when methane phase
The growth of bacterium, pH is too low, CO2It increases, a large amount of water soluble organic substances and H2S is generated, and the increase of sulfide content can inhibit methane phase
The growth of bacterium；The excessively high activity that can also inhibit methanogen of pH.
Preferably, using pH when the sodium hydroxide of the hydrochloric acid of a concentration of 1.0mol/L or 1.0mol/L progress anaerobic fermentation
It adjusts.
In a preferred embodiment, stirring technique when anaerobic fermentation is：Stir speed (S.S.) 45-55rad/min, is stirred
12-18min, mixing time 3-7min are divided between mixing.Above-mentioned stir speed (S.S.) it is typical but non-limiting for 45rad/min,
46rad/min、47rad/min、48rad/min、49rad/min、50rad/min、51rad/min、52rad/min、53rad/
Min, 54rad/min or 55rad/min；Stirring interval it is typical but non-limiting for 12min, 13min, 14min, 15min,
16min, 17min or 18min；Mixing time it is typical but non-limiting for 3min, 3.5min, 4min, 4.5min, 5min,
5.5min, 6min, 6.5min or 7min.Above-mentioned stir speed (S.S.) is preferably 47-52rad/min, further preferably 50rad/
min；Above-mentioned stirring is preferably spaced 13-17min, further preferably 15min；Above-mentioned mixing time is preferably 3.5-
6.5min, further preferably 5min.
In a preferred embodiment, sludge retention time is 8-12 days when anaerobic fermentation, temperature when anaerobic fermentation
Degree is 30-40 DEG C.It is 8 days that above-mentioned sludge retention time is typical but non-limiting, 8.5 days, 9 days, 9.5 days, 10 days, 10.5
It, 11 days, 11.5 days or 12 days；It is 30 DEG C that above-mentioned temperature is typical but non-limiting, 31 DEG C, 32 DEG C, 33 DEG C, 34 DEG C, 35 DEG C,
36 DEG C, 37 DEG C, 38 DEG C, 39 DEG C or 40 DEG C.Above-mentioned sludge retention time is preferably 9-11 days, further preferably 10 days；It is above-mentioned
Temperature is preferably 32-38 DEG C, further preferably 35 DEG C.
By optimizing stirring technique, sludge retention time and the temperature of anaerobic fermentation, further promote the release of volatile acid
With the recycling of phosphate fertilizer.
In a preferred embodiment, pH when phosphorus recycles is 9.5-10.5.Above-mentioned pH is typical but non-limiting
It is 9.5,9.6,9.7,9.8,9.9,10,10.1,10.2,10.3,10.4 or 10.5.It is found through a large number of experiments, when pH is 9.5-
When 10.5, phosphorous recovery highest.
Preferably, by adding MgCl2Phosphorus recycling is carried out, by add aing base to adjust pH when phosphorus recycling.Utilize anaerobism
It ferments the ammonia nitrogen of release and phosphate recycles fertilizer.
In a preferred embodiment, the metal ion is Fe3+And/or Al3+。
For example, when metal ion is Fe3+When, the advantages of the method for the present invention includes the following：
1, EDTA or edta salt and organic matter contention Fe (III) formed stablize EDTA-Fe (III) complex compound, make organic matter from
Stable Fe (III)-organic matter-PO4 3-In release, improve follow-up anaerobic fermentation process to organic resources organic efficiency；
2, EDTA or edta salt and S2-、CO3 2-And PO4 3-It fights for Fe (III) and is formed and stablize EDTA-Fe (III) complex compound, make
PO4 3-From Fe (III)-organic matter-PO4 3-In release, improve the recycling of phosphate fertilizer；
3, EDTA-Fe (III) complex compound formed can be utilized by anaerobe, activate a variety of keys in acid process
The activity of metalloenzyme puies forward high acid efficiency；
4, Fe (III) exists with EDTA-Fe (III) complex form in anaerobic fermentation process, effectively prevents anaerobic fermentation
The reduction of oxidation-reduction potential (oxidation reduction potential, ORP) in the process is created for anaerobe
Suitable living environment.
Second aspect provides a kind of system of chemical strengthening primary sludge resource recycling in some embodiments,
Including chemical strengthening primary sludge pond, EDTA regulating reservoirs or edta salt regulating reservoir, anaerobic fermentation reaction tank and the phosphorus being sequentially connected
Retracting device.Above system setting is reasonable, can recycle the resources such as volatile acid and phosphate fertilizer using the system, realize subtracting for CEPSS
The comprehensive utilization of quantization and resource.
Embodiment
1. experiment material
Primary reinforcement sludge used by this experiment is derived from certain sewage treatment plant, and coagulant used is iron chloride, level-one
The property of reinforcement sludge is as shown in table 1.
The property of 1 primary reinforcement sludge of table
2. experiment parameter
(1) EDTA regulating reservoirs：
It adds 200mg/L disodium ethylene diamine tetraacetates primary reinforcement sludge is adjusted, stir speed (S.S.) 50rad/
Min, hydraulic detention time (HRT) are 10min.
(2) anaerobic fermentation reaction tank：
The pH in anaerobic fermentation reaction tank is controlled by the sodium hydroxide of the hydrochloric acid or 1.0mol/L that add 1.0mol/L
7.0 ± 0.5；Anaerobic fermentation reaction tank is primary every stirring in 15 minutes, mixing time 5min, stir speed (S.S.) 50rad/
min；Sludge retention time (SRT) control of anaerobic fermentation is 10 days, and temperature is 35 DEG C.
(3) phosphorus recovery device：
By adding MgCl2, it is 10 by adding alkali and controlling reaction condition in pH, the ammonia nitrogen discharged using anaerobic fermentation
Fertilizer is recycled with phosphate.
3. experiment conclusion
(1) COD, volatile acid and phosphatic release
After EDTA is handled, the anaerobic fermentation raising with obvious effects of primary reinforcement sludge.By taking anaerobic fermentation 10d as an example, such as
Shown in Fig. 3 and Fig. 4,3700mg/L, 2920mg- is respectively increased in COD, volatile acid and the phosphate concn of EDTA processing sludge
COD/L and 24.5mg/L has been respectively increased 38.4%, 41.6% and 141.3% than untreated sludge.It can be seen that EDTA is adjusted favorably
In the subsequent utilization of resources of raising.
(2) phosphatic recycling
As shown in figure 5, after phosphate retracting device is handled, water outlet phosphate mean concentration is 0.5 ± 0.3mg/
L, the phosphatic rate of recovery is 85% or more.
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that without departing substantially from the present invention's
Many other change and modification can be made in the case of spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (10)
1. a kind of method of chemical strengthening primary sludge resource recycling, which is characterized in that use EDTA or edta salt first
Metal ion in chemical strengthening primary sludge is adjusted, then carries out anaerobic fermentation and phosphorus recycling successively.
2. the method for chemical strengthening primary sludge resource recycling according to claim 1, which is characterized in that EDTA or
A concentration of 150-250mg/L of EDTA or edta salt when edta salt is adjusted.
3. the method for chemical strengthening primary sludge resource recycling according to claim 1, which is characterized in that EDTA or
Stir speed (S.S.) when edta salt is adjusted is 45-55rad/min.
4. according to the method for claim 1-3 any one of them chemical strengthening primary sludge resource recyclings, feature exists
In hydraulic detention time when EDTA or edta salt are adjusted is 8-12min.
5. the method for chemical strengthening primary sludge resource recycling according to claim 1, which is characterized in that detested
PH when aerobe fermentation is 7.0 ± 0.5.
6. the method for chemical strengthening primary sludge resource recycling according to claim 1, which is characterized in that anaerobism is sent out
Stirring technique when ferment is：Stir speed (S.S.) 45-55rad/min is divided into 12-18min, mixing time 3-7min between stirring.
7. the method for the chemical strengthening primary sludge resource recycling according to claim 1,5 or 6, which is characterized in that
Sludge retention time is 8-12 days when anaerobic fermentation, and temperature when anaerobic fermentation is 30-40 DEG C.
8. the method for the chemical strengthening primary sludge resource recycling according to claim 1,2,3,5 or 6, feature exist
In pH when phosphorus recycles is 9.5-10.5.
9. the method for chemical strengthening primary sludge resource recycling according to claim 1, which is characterized in that the gold
Category ion is Fe3+And/or Al3+。
10. a kind of system of chemical strengthening primary sludge resource recycling, which is characterized in that the chemistry including being sequentially connected is strong
Change primary sludge pond, EDTA regulating reservoirs or edta salt regulating reservoir, anaerobic fermentation reaction tank and phosphorus recovery device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113860673A (en) * | 2021-09-17 | 2021-12-31 | 沧州市供水排水集团有限公司 | Method for realizing carbon source recovery and sludge reduction of excess sludge in leachate treatment plant |
| CN114291987A (en) * | 2022-01-10 | 2022-04-08 | 长春工程学院 | System and method for recovering carbon and phosphorus resources in excess sludge by using ultrasonic wave assistance |
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| CN108046557A (en) * | 2017-09-20 | 2018-05-18 | 同济大学 | The method that the sludge of phosphate-containing precipitation is promoted to release phosphorus and aerogenesis at ambient temperature |
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| US20140144839A1 (en) * | 2012-11-28 | 2014-05-29 | Korea Institute Of Science And Technology | Apparatus and method for cultivating microalgae using effluent from sludge treatment |
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| CN113860673A (en) * | 2021-09-17 | 2021-12-31 | 沧州市供水排水集团有限公司 | Method for realizing carbon source recovery and sludge reduction of excess sludge in leachate treatment plant |
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Application publication date: 20181002 |