CN109081535A - A method of improving aerobic digested sludge dewatering - Google Patents
A method of improving aerobic digested sludge dewatering Download PDFInfo
- Publication number
- CN109081535A CN109081535A CN201810885004.0A CN201810885004A CN109081535A CN 109081535 A CN109081535 A CN 109081535A CN 201810885004 A CN201810885004 A CN 201810885004A CN 109081535 A CN109081535 A CN 109081535A
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- Prior art keywords
- sludge
- aerobic
- iron powder
- digested sludge
- improving
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Classifications
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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
-
- 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
-
- 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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
Abstract
The present invention relates to a kind of methods for improving aerobic digested sludge dewatering, using following steps: 1) culture of aerobic sludge: carrying out aerobic sigestion processing to the thickened sludge of sewage treatment plant；2) oxidation processes: launching iron powder into aerobic digested sludge, and oscillation mixes；3) persulfate is launched toward sludge to be drained off after mixing, at the uniform velocity stirs to get oxidation mixture；4) iron is recycled: after oxidation processes, for the iron powder added not completely into sludge system, the iron powder being present in sludge passes through magnetic stirring equipment recycling iron powder；5) dehydration: the mud mixture obtained to step 4) processing carries out filter-press dehydration, and filters pressing sludge filtrate obtained after separation is recycled to the source water water inlet end of sewage treatment plant.Compared with prior art, reaction efficiency of the present invention is high, the time is short, and operation is simple, and processing capacity is strong, effectively reduces subsequent Treatment of Sludge cost.
Description
Technical field
The present invention relates to sludge dewatering fields, more particularly, to the method for improving aerobic digested sludge dewatering.
Background technique
Activated sludge process is most widely used wastewater processing technology, and generates a large amount of sludge.In China, by 2015
Bottom, dewatered sludge (80% water content, WC) yield reach 35,000,000 tons.Treatment of Sludge and cost of disposal are high, account for waste water treatment plant
The 60% of total operating cost.Therefore, flood tide sludge lead to the problem of have become one it is serious.Aerobic sigestion is usually used in small-scale sewage
Treatment plant is the common method of a kind of stabilisation and minimizing before sludge treatment.Aerobic digested sludge dehydration can economical and effective
Ground reduces sludge quantity.The operation is related to multiple technologies, such as mechanical filter, electro-osmosis, heated drying and artificial swamp etc..From
The heart, filters pressing and other mechanical dehydration technologies are used widely in sewage treatment plant；However, they can only remove free water and
A small amount of Interstitial Water is still higher so as to cause moisture content in dewatered sludge.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind to reach improvement dehydration
The method of performance.
The purpose of the present invention can be achieved through the following technical solutions:
A method of improving aerobic digested sludge dewatering, using following steps:
1) aerobic sigestion processing the culture of aerobic sludge: is carried out to the thickened sludge of sewage treatment plant；
2) oxidation processes: launching iron powder into aerobic digested sludge, and the injected volume of iron powder is that (TS is with good by 0.05~5g/gTS
Oxygen digests mud extraction and calculates), oscillation mixes；
3) persulfate is launched toward sludge to be drained off after mixing, the injected volume of persulfate is 0.05~4g/gTS (over cure
Hydrochlorate injected volume is with over cure acid group Mass Calculation, and TS is with aerobic sigestion mud extraction calculating), at the uniform velocity stir to get oxidation mixture；
4) iron is recycled: after oxidation processes, the iron powder added completely into sludge system, is not present in sludge
Iron powder achievees the effect that recycling by magnetic stirring equipment recycling iron powder；
5) dehydration: the mud mixture obtained to step 4) processing carries out filter-press dehydration, and filters pressing is obtained after separation
Sludge filtrate is recycled to the source water water inlet end of sewage treatment plant, and filter cake is handled using other recycling treatment modes.
Control sludge retention time is greater than 7 days when step 1) carries out aerobic sigestion processing, keeps dissolved oxygen concentration in sludge
Greater than 2mg/L, pH value control is greater than 6, and by dissolved oxygen concentration in control aeration control sludge, 9 alkalinity is greater than using pH
Substance, such as Na2CO3、NaOH、NaHCO3、CaCO3Deng one such or a variety of, the pH value of conditioning of mud can be used.
Potentiometric titrations have very high oxidation-reduction potential, since it is for the height degradability of Extracellular Polymers
With cell can be destroyed in oxidation process, therefore have good performance in sludge dewatering.Potentiometric titrations can be by adding
Heat, ultraviolet light and transition metal activation obtain.It is documented and persulfate acquisition sulfate radical freedom is activated by ferrous iron
The CST value of activated sludge can be reduced about 88% by base, and also useful electrolysis-coagulation joint fe activates persulfate, can be incited somebody to action
The sludge specific resistance and capillary dewatering time of municipal sludge lower 87.4% and 49.1%.Compared to ferrous iron, fe is more steady
Determine and can be recycled by electromagnetism.Therefore, fe/persulfate can be used as the effective adjusting unit for changing dehydration,
The degradation of EPS and the destruction of cell have facilitation for subsequent dewatering unit in potentiometric titrations oxidation process.
Compared with prior art, the invention has the following advantages that
1, dewatering performance of sludge significantly improves, and destroys sludge wadding body, extracellular polymeric is made to disintegrate, and changes sludge water content point
Cloth mentions degree of dehydration.
2, treatment effeciency is high, and operational management is simple, strong operability.This method is related to adding at iron powder and persulfate
Manage unit, need to only increase processing unit before dewatering unit after sludge aerobic digests, the unit pertain only to dispensing and
Stirring, operation is simple, easy to promote and utilize.
3, adding of agent involved in this method, adding less and recyclable, cost is relatively low, easy to operate, can grasp
The property made is strong.
4, the pressure of subsequent processing is alleviated.Sludge after treatment, not only dewatering improves, and increases dirt
Ferro element in mud enhances subsequent phosphor-removing effect, and this method is suitable for improving aerobic digested sludge dewatering, has extensive
Application prospect.
Detailed description of the invention
Fig. 1 is dehydrating effect with adding the different change curve of iron powder dosage；
Fig. 2 is dehydrating effect with adding the different change curve of potassium peroxydisulfate dosage.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
Embodiment 1
The experiment being dehydrated using potassium peroxydisulfate and iron powder to aerobic digested sludge is carried out by the following method:
Take certain sewage treatment plant's thickened sludge, sludge shale is as follows: solid content 98%, VS/TS=71.34% are used
Volume is the glass fermentation tank of 5L, and the sample tap of 2 different heights is arranged on wall, is separated by by diameter 16cm, high 30cm
10cm is persistently aerated with the aeration quantity of 1L/min, and using magnetic agitation, stirrer length is that 5cm diameter is 1cm, and revolving speed is
800rpm guarantees that stirring is good in reactor, prevents part from generating anaerobic conditions.Primary sludge carries out aerobic sigestion processing, sludge
Residence time is 15 days, continues to monitor its dissolved oxygen, and pH keeps dissolved oxygen concentration to be greater than 2mg/L, and pH is not less than 6, if dissolution
Oxygen is too low, then increases aeration quantity, and pH is too low, be added pH=10 sodium carbonate/bicarbonate buffer adjust (actual condition can
It adds quick lime and reduces cost).
1, aerobic digested sludge is sampled, after resolution, tests its iron with inductively coupled plasma atomic emission spectrum
Content.
2, aerobic digested sludge 100ml (before sampling by sludge agitation one hour) is taken, 250mL conical flask is added, is added
The iron powder and potassium peroxydisulfate of various concentration gradient.(potassium peroxydisulfate injected volume shown in table be with over cure acid group Mass Calculation, TS with
Aerobic sigestion mud extraction calculates))
The dosage of iron powder and hydrogen peroxide
3, after vibrating, its CST (capillary water absorbing time) is tested, carries out replication three times, as a result such as Fig. 1, Fig. 2 institute
Show.
4, aerobic digested sludge (Iron is taken again0) 100ml, iron powder (ZVI is added0) and potassium peroxydisulfate reach its solubility
CST optimum combination corresponding concentration.Magnet rotor (length 3cm, diameter 0.8cm) is added with 200rpm in sludge after will be processed
Revolving speed stir 5min, take out rotor, replace clean rotor, in triplicate, test excess sludge in iron content (Ironr)。
The rate of recovery mode of iron calculates as follows:
Iron recovery (%)=(Iron0+ZVI0-Ironr/ZVI0) * 100%
It is persulfate dosage according to the 4th step CST optimum combination of result is 0.2g/gTS, iron dosage is 0.05g/
GTS, Fe (VI) rate of recovery calculated is 40.3% under the dosage.
As shown in Figure 1, when potassium peroxydisulfate dosage is 0.5g/gTS, it is aobvious with the variation of iron powder dosage difference sludge CST
It writes.The dosage for changing iron powder increases as Fe adds concentration, and the CST of sludge is gradually declining, when iron dosage is 0.05g/
When gTS, CST slip can reach 80%.On this basis, it when setting iron powder dosage as 0.05g/gTS, is thrown with persulfate
Dosage increases, and CST decline is obvious, and potassium peroxydisulfate adds concentration when being 0.2g/gTS, and CST slip is up to 83.%.
After aerobic digested sludge has carried out dosing oxidation processes, the capillary water absorbing time of sludge greatly reduces, by analysis,
When iron dosage is 0.05~1.5g/gTS, and potassium peroxydisulfate dosage is 0.05-0.4g/gTS, capillary dewatering time can be by
110s is reduced to 20s or so, and up to 80% or more, dewatering performance of sludge gets a promotion slip.
Embodiment 2
A method of improving aerobic digested sludge dewatering, using following steps:
1) aerobic sigestion processing, sludge retention time the culture of aerobic sludge: are carried out to the thickened sludge of sewage treatment plant
Greater than 7 days, 2mg/L is greater than by dissolved oxygen concentration in control aeration control sludge, 9 alkaline matter is greater than using pH, such as
Na2CO3、NaOH、NaHCO3、CaCO3The pH value of equal conditioning of mud is greater than 6；
2) oxidation processes: launching iron powder into aerobic digested sludge, and the injected volume of iron powder is that (TS is with aerobic by 0.05g/gTS
Mud extraction is digested to calculate), oscillation mixes；
3) persulfate is launched toward sludge to be drained off after mixing, the injected volume of persulfate is 0.05g/gTS (persulfate
Injected volume is with over cure acid group Mass Calculation, and TS is with aerobic sigestion mud extraction calculating), at the uniform velocity stir to get oxidation mixture；
4) iron is recycled: after oxidation processes, the iron powder added completely into sludge system, is not present in sludge
Iron powder achievees the effect that recycling by magnetic stirring equipment recycling iron powder；
5) dehydration: the mud mixture obtained to step 4) processing carries out filter-press dehydration, and filters pressing is obtained after separation
Sludge filtrate is recycled to the source water water inlet end of sewage treatment plant, and filter cake uses outlet after other recycling treatment modes.
Embodiment 3
A method of improving aerobic digested sludge dewatering, using following steps:
1) aerobic sigestion processing, sludge retention time the culture of aerobic sludge: are carried out to the thickened sludge of sewage treatment plant
Greater than 7 days, 2mg/L is greater than by dissolved oxygen concentration in control aeration control sludge, 9 alkaline matter is greater than using pH, such as
Na2CO3、NaOH、NaHCO3、CaCO3The pH value of equal conditioning of mud is greater than 6；
2) oxidation processes: launching iron powder into aerobic digested sludge, and the injected volume of iron powder is that (TS is with aerobic sigestion by 5g/gTS
Mud extraction calculates), oscillation mixes；
3) persulfate is launched toward sludge to be drained off after mixing, the injected volume of persulfate is that 5g/gTS (throw by persulfate
High-volume with over cure acid group Mass Calculation, TS is with aerobic sigestion mud extraction calculating), at the uniform velocity stir to get oxidation mixture；
4) iron is recycled: after oxidation processes, the iron powder added completely into sludge system, is not present in sludge
Iron powder achievees the effect that recycling by magnetic stirring equipment recycling iron powder；
5) dehydration: the mud mixture obtained to step 4) processing carries out filter-press dehydration, and filters pressing is obtained after separation
Sludge filtrate is recycled to the source water water inlet end of sewage treatment plant, and filter cake uses outlet after other recycling treatment modes.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (7)
1. a kind of method for improving aerobic digested sludge dewatering, which is characterized in that this method uses following steps:
1) aerobic sigestion processing the culture of aerobic sludge: is carried out to the thickened sludge of sewage treatment plant；
2) oxidation processes: launching iron powder into aerobic digested sludge, and oscillation mixes；
3) persulfate is launched toward sludge to be drained off after mixing, at the uniform velocity stirs to get oxidation mixture；
4) iron is recycled: after oxidation processes, the iron powder added is not completely into sludge system, the iron powder that is present in sludge
Pass through magnetic stirring equipment recycling iron powder；
5) dehydration: the mud mixture obtained to step 4) processing carries out filter-press dehydration, filters pressing sludge obtained after separation
Filtrate cycle to sewage treatment plant source water water inlet end.
2. a kind of method for improving aerobic digested sludge dewatering according to claim 1, which is characterized in that step 2)
The middle amount 0.05-5g/gTS for launching iron powder.
3. a kind of method for improving aerobic digested sludge dewatering according to claim 1, which is characterized in that step 3)
The middle amount for launching persulfate is 0.05-4g/gTS.
4. a kind of method for improving aerobic digested sludge dewatering according to claim 1, which is characterized in that step 1)
Control sludge retention time is greater than 7 days when carrying out aerobic sigestion processing, and dissolved oxygen concentration in sludge is kept to be greater than 2mg/L, pH value
Control is being greater than 6.
5. a kind of method for improving aerobic digested sludge dewatering according to claim 4, which is characterized in that step 1)
In by control aeration control sludge in dissolved oxygen concentration.
6. a kind of method for improving aerobic digested sludge dewatering according to claim 4, which is characterized in that step 1)
The pH value of the middle alkaline matter conditioning of mud using pH greater than 9.
7. a kind of method for improving aerobic digested sludge dewatering according to claim 6, which is characterized in that the alkali
Property substance includes Na2CO3、NaOH、NaHCO3Or CaCO3One of or it is a variety of.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810885004.0A CN109081535A (en) | 2018-08-06 | 2018-08-06 | A method of improving aerobic digested sludge dewatering |
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| CN201810885004.0A CN109081535A (en) | 2018-08-06 | 2018-08-06 | A method of improving aerobic digested sludge dewatering |
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Cited By (2)
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| CN117342776A (en) * | 2023-12-04 | 2024-01-05 | 中煤科工集团杭州研究院有限公司 | Sludge composite conditioning and deep dewatering method |
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Application publication date: 20181225 |