CN107129123A - The method of anaerobic fermentation excess sludge and the method that phosphorus is reclaimed from excess sludge - Google Patents
The method of anaerobic fermentation excess sludge and the method that phosphorus is reclaimed from excess sludge Download PDFInfo
- Publication number
- CN107129123A CN107129123A CN201710225326.8A CN201710225326A CN107129123A CN 107129123 A CN107129123 A CN 107129123A CN 201710225326 A CN201710225326 A CN 201710225326A CN 107129123 A CN107129123 A CN 107129123A
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- Prior art keywords
- excess sludge
- phosphorus
- anaerobic fermentation
- supernatant
- reclaimed
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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
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/32—Phosphates of magnesium, calcium, strontium, or barium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/45—Phosphates containing plural metal, or metal and ammonium
- C01B25/451—Phosphates containing plural metal, or metal and ammonium containing metal and ammonium
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Molecular Biology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Treatment Of Sludge (AREA)
Abstract
The method that phosphorus is reclaimed the invention discloses the method for anaerobic fermentation excess sludge and from excess sludge, the method for anaerobic fermentation excess sludge comprises the following steps：Directly add alkali stirring into excess sludge, adjust and keep pH >=9 of excess sludge, carry out anaerobic fermentation, the cell membrane that alkaline anaerobic fermentation can destroy aerobic bacteria discharges phosphorus and nutriment inside bacterium, anaerobic bacteria extrudes aerobic bacteria living space, further promote the rupture of aerobic bacteria bacterium, promote phosphorus release, phosphorus bacterium for degrading can be promoted to discharge phosphorus under anaerobic environment, and anaerobism alkalescence condition anaerobic bacteria produces a large amount of short chain fatty acids, short chain fatty acids can promote phosphorus bacterium for degrading to discharge phosphorus, commutation condition makes Phos precipitation be converted into soluble phosphate and enter in supernatant, to sum up, alkaline anaerobic fermentation promotes the phosphorus in excess sludge to be discharged into supernatant, phosphorus is that recovery can be achieved using conventional precipitation method in supernatant, the recovery method is with low cost, and it is time-consuming shorter.
Description
Technical field
The present invention relates to environmental technology field, and in particular to the method for anaerobic fermentation excess sludge and from excess sludge return
The method for receiving phosphorus.
Background technology
As China's town sewage discharge capacity is continuously increased, wastewater treatment rate is improved constantly, the dirt that sewage treatment plant produces
The amount of mud especially excess sludge is increasing, and current specific resistance to filtration is costly, accounts for sewage treatment plant's overall running cost
More than 50%.Containing nutrients such as organic matter, nitrogen, phosphorus, potassium, trace elements in sludge, plant growth needs can be supplied,
If the recycling of sludge can be realized, the operating cost of sewage treatment plant can be reduced to a certain extent.Current phosphorus is returned
Receipts mainly use chemical recovering method, such as ammonium phosphate magnesium processes, ammonium magnesium phosphate is good slow release fertilizer, as long as in solution contain magnesium from
Son, ammonia nitrogen and orthophosphoric acid, their the solubility product Changshu of ion concentration product more than ammonium magnesium phosphate, and pH is in the alkaline models of 8.5-10
Enclose, just have ammonium magnesium phosphate generation.
Contain a large amount of phosphorus in municipal sewage, be mainly removed in sewage disposal process into excess sludge, therefore,
Contain a large amount of recyclable phosphorus in excess sludge.Phosphorus is reclaimed from sludge, because the phosphorus in sludge is both present in extracellular polymeric
In, intracellular is present in again, therefore by preprocessing means phosphorus must be made to be discharged into supernatant first, reprecipitation separation and recovery
Utilize.At present it has been reported that pretreating sludge release phosphorus method include acid system, Ozone, supercritical ultrasonics technology, microwave method and add
Hot method etc., but there is the problem of structures and equipment investment cost be big and power consumption medicine consumes costly in these methods.And it is above-mentioned
The supernatant that these processing methods are obtained all is slant acidity or weakly acidic pH, does not reach the alkalescence required by ammonium phosphate magnesium processes recovery phosphorus
Scope, it is necessary to plus alkali regulation pH, further add reagent cost.So, current sludge discharges the preprocess method of phosphorus
Cost is higher, it is impossible to meet actual production demand, it is desirable to provide a kind of sludge with low cost discharges the preprocess method of phosphorus.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method of anaerobic fermentation excess sludge with low cost, make
Phosphorus in excess sludge is discharged into supernatant, and a kind of method with low cost that phosphorus is reclaimed from excess sludge.
The technical solution used in the present invention is：
A kind of method of anaerobic fermentation excess sludge, comprises the following steps：Directly add alkali stirring into excess sludge, adjust and protect
PH >=9 of excess sludge are held, anaerobic fermentation is carried out.
Some preferred embodiment in, comprise the following steps：Directly add alkali stirring into excess sludge, adjust and protect
The pH for holding excess sludge is 9.8-10.2, carries out anaerobic fermentation.
Some preferred embodiment in, the liquid level formation whirlpool of excess sludge can not be made in described plus alkali whipping process
Whirlpool.
Some preferred embodiment in, the anaerobic fermentation time be 6-10 days.
Some preferred embodiment in, dissolved oxygen concentration≤0.2 in control anaerobic fermentation process in excess sludge
mg/L。
Some preferred embodiment in, the alkali be sodium hydroxide, potassium hydroxide or calcium hydroxide.
In addition, present invention also offers a kind of method that phosphorus is reclaimed from excess sludge, comprising the following steps：
S1：In excess sludge storage pool using anaerobic fermentation excess sludge as described above method to excess sludge progress at
Reason；
S2：Thickening is carried out to the excess sludge after processing, supernatant is obtained；
S3：The phosphorus in the supernatant is reclaimed by the precipitation method.
Some preferred embodiment in, S3's concretely comprises the following steps：Precipitating reagent is added into the supernatant, stirring is anti-
Should, it is separated and recovered from the sediment that reaction is produced.
In further preferred embodiment, the precipitating reagent is magnesium salts or calcium salt.
The beneficial effects of the invention are as follows：
The invention provides a kind of method of anaerobic fermentation excess sludge, comprise the following steps：Directly add alkali into excess sludge
Stirring, adjusts and keeps pH >=9 of excess sludge, carries out anaerobic fermentation, first, in alkalescence regulation（pH≥9）When, hydroxyl meeting
Occurs saponification with the cellulose of the cell membrane of sludge bacterium, destruction cell membrane discharges the phosphorus inside bacterium, is mainly
Oxygen bacterium, because the cell wall thickness of anaerobic bacteria；Second, because alkali accelerates the death of bacterium so that intracellular macrometabolic element
Mass flow goes out, and can promote the growth of anaerobic bacteria, and anaerobic bacteria can further swallow aerobic bacteria, extrude the living space of aerobic bacteria,
Promote aerobic bacteria rapid decline, further promote the rupture of aerobic bacteria bacterium, promote phosphorus release；3rd, it can promote under anaerobic environment
Phosphorus bacterium for degrading is set to discharge phosphorus（Absorbed under aerobic condition and discharge phosphorus under phosphorus, anaerobic condition）, anaerobism alkalescence condition can promote to detest
Oxygen bacterium produces a large amount of short chain fatty acids, short chain fatty acids（Mainly acetic acid）Phosphorus bacterium for degrading can be promoted to discharge phosphorus；4th, it is dirty
Water treatment plant would generally use aluminium salt or molysite deposition dephosphorization in advanced treatment process, so containing a large amount of inorganic in excess sludge
Phosphorus sediment, AlPO4Factor in precipitation Ksp be 6.30 × 10-19, FePO4Factor in precipitation Ksp be 1.30 × 10-22, work as residue
Sludge pH is more than 8.5, and the Phos precipitation of excess sludge can then be fully converted to soluble phosphate and enter in supernatant, comprehensive
Close and state four layers of mechanism, the phosphorus in excess sludge can be promoted to be discharged into supernatant well using alkaline anaerobic fermentation, released
Phosphorus rate is 55-79%, and the method for the invention technique is simple, and structures are built without extra, can be in situ in excess sludge
Storage pool in directly handled, without hermetically sealed can or other reaction tanks, reduce structures construction cost, it is only necessary to make
Be that may be such that the phosphorus in excess sludge is discharged with alkali, equipment only needs to agitating device, with low cost, and the reaction time compared with
Short, it is enough within general 6-10 days.
Brief description of the drawings
Fig. 1 is change curve of the phosphorus concentration recyclable in supernatant under different pH with fermentation time.
Embodiment
The many parts of same amount of excess sludges without any processing are taken, is divided into five groups and is tested, be respectively put into identical
In reaction vessel, every group of 4 Duplicate Samples, plus adjusting PH with base carry out anaerobic fermentation, and 1-5 groups do not adjust pH, adjust and protect respectively successively
Hold pH to be 9, adjust and keep pH to be 10, adjust and keep pH to be 12, adjust and keep pH to be 13, stir, plus alkali whipping process
In can not make the liquid level formation whirlpool of excess sludge, such whipping process will not be filled with oxygen into excess sludge, plus alkali can
Sodium hydroxide, potassium hydroxide or calcium hydroxide are selected, anaerobic fermentation is carried out 10 days, in control anaerobic fermentation process in excess sludge
Below the mg/L of dissolved oxygen concentration 0.2, fermentation process need not control strictly anaerobic, be carried out without in water-tight equipment, fermentation process
In take supernatant analysis wherein recyclable phosphorus concentration at regular intervals, obtain curve as shown in Figure 1.
It can be seen from figure 1 that pH is not adjusted in the 1st group, and direct anaerobic fermentation, it is 43% to release phosphorus rate, and the 2nd group of regulation pH is
9, it is 55% to release phosphorus rate, and the 3rd group of regulation pH is 10, and it is 65% to release phosphorus rate, and the 4th group of regulation pH is 12, and it is 67%, the 5th group of tune to release phosphorus rate
It is 13 to save pH, releases phosphorus rate for 79%, although it is more to release phosphorus when than pH being 12 when pH is 13, but institute's alkali consumption is big（Because supernatant
In contained HPO4 2-And H2PO4-Control buffering range 4.5-10 or so, to adjust pH to more than 10, it is necessary to add a large amount of alkali）.
So integrated approach cost is with releasing phosphorus effect, optimal selection is that pH is 9.8-10.2, and the scope is also the limit of basophilic bacterium
PH value, and this scope pH most useful for produce short chain fatty acids.
After alkaline anaerobic fermentation, more phosphorus is released into supernatant in excess sludge, to surplus after processing
Remaining sludge carries out thickening, obtains supernatant, and thickening can obtain supernatant using techniques such as natural subsidence, press filtrations
The precipitation method that can use to be widely known by the people afterwards reclaim the phosphorus in supernatant, such as magnesium ammonium phosphate sediment method and the synthos precipitation method
Deng concretely comprising the following steps：The precipitating reagents such as magnesium salt solution or calcium saline solution, stirring reaction, separation are added into the supernatant
And reclaim the sediment that reaction is produced, you can realize the recovery of phosphorus in supernatant.
Claims (9)
1. a kind of method of anaerobic fermentation excess sludge, it is characterised in that comprise the following steps：Directly add alkali into excess sludge
Stirring, adjusts and keeps pH >=9 of excess sludge, carries out anaerobic fermentation.
2. the method for anaerobic fermentation excess sludge according to claim 1, it is characterised in that comprise the following steps：Directly
Add alkali stirring into excess sludge, the pH for adjusting and keeping excess sludge is 9.8-10.2, carries out anaerobic fermentation.
3. the method for anaerobic fermentation excess sludge according to claim 1, it is characterised in that in described plus alkali whipping process
The liquid level formation whirlpool of excess sludge can not be made.
4. the method for the anaerobic fermentation excess sludge according to claim any one of 1-3, it is characterised in that during anaerobic fermentation
Between be 6-10 days.
5. the method for the anaerobic fermentation excess sludge according to claim any one of 1-3, it is characterised in that control anaerobism hair
The mg/L of dissolved oxygen concentration during ferment in excess sludge≤0.2.
6. the method for the anaerobic fermentation excess sludge according to claim any one of 1-3, it is characterised in that the alkali is hydrogen
Sodium oxide molybdena, potassium hydroxide or calcium hydroxide.
7. a kind of method that phosphorus is reclaimed from excess sludge, it is characterised in that comprise the following steps：
S1：Using the method for the anaerobic fermentation excess sludge as described in claim any one of 1-6 in excess sludge storage pool
Excess sludge is handled；
S2：Thickening is carried out to the excess sludge after processing, supernatant is obtained；
S3：The phosphorus in the supernatant is reclaimed by the precipitation method.
8. the method according to claim 7 that phosphorus is reclaimed from excess sludge, it is characterised in that S3's concretely comprises the following steps：
Precipitating reagent is added into the supernatant, stirring reaction is separated and recovered from the sediment that reaction is produced.
9. the method according to claim 8 that phosphorus is reclaimed from excess sludge, it is characterised in that the precipitating reagent is magnesium salts
Or calcium salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710225326.8A CN107129123A (en) | 2017-04-07 | 2017-04-07 | The method of anaerobic fermentation excess sludge and the method that phosphorus is reclaimed from excess sludge |
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| CN201710225326.8A CN107129123A (en) | 2017-04-07 | 2017-04-07 | The method of anaerobic fermentation excess sludge and the method that phosphorus is reclaimed from excess sludge |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107881203A (en) * | 2017-10-25 | 2018-04-06 | 江南大学 | A kind of method for promoting excess sludge anaerobic fermentation and acid production |
| CN110395800A (en) * | 2019-08-27 | 2019-11-01 | 江南大学 | A kind of preparation method and application for denitrification additional carbon |
| CN110790249A (en) * | 2019-11-17 | 2020-02-14 | 南通职业大学 | Method and equipment for treating phosphorus-containing wastewater |
| WO2020211729A1 (en) * | 2019-04-16 | 2020-10-22 | 浙江大学 | Method for treating sludge by anaerobic fermentation with simultaneous enhancement of acid production and phosphorus removal |
| CN113087333A (en) * | 2021-03-27 | 2021-07-09 | 同济大学 | Resource process for synchronously strengthening anaerobic acidogenesis and phosphorus recovery of sludge |
| CN115974350A (en) * | 2023-02-28 | 2023-04-18 | 重庆大学 | Method for enhancing residual sludge phosphorus release by ascorbic acid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004008957A (en) * | 2002-06-07 | 2004-01-15 | Ebara Corp | Phosphorus and nitrogen recovery method and apparatus therefor |
| CN101070217A (en) * | 2007-06-14 | 2007-11-14 | 同济大学 | Method for increasing sewage-reinforced biological phosphor-removing effect by resource utilizing mud organic substance |
-
2017
- 2017-04-07 CN CN201710225326.8A patent/CN107129123A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004008957A (en) * | 2002-06-07 | 2004-01-15 | Ebara Corp | Phosphorus and nitrogen recovery method and apparatus therefor |
| CN101070217A (en) * | 2007-06-14 | 2007-11-14 | 同济大学 | Method for increasing sewage-reinforced biological phosphor-removing effect by resource utilizing mud organic substance |
Non-Patent Citations (1)
| Title |
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| 苑宏英等: ""pH对剩余污泥厌氧发酵产生的COD、磷及氨氮的影响"", 《环境科学》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107881203A (en) * | 2017-10-25 | 2018-04-06 | 江南大学 | A kind of method for promoting excess sludge anaerobic fermentation and acid production |
| WO2020211729A1 (en) * | 2019-04-16 | 2020-10-22 | 浙江大学 | Method for treating sludge by anaerobic fermentation with simultaneous enhancement of acid production and phosphorus removal |
| US11970415B2 (en) | 2019-04-16 | 2024-04-30 | Zhejiang University | Sludge anaerobic fermentation treatment method with simultaneously enhanced acid production and phosphorus removal |
| CN110395800A (en) * | 2019-08-27 | 2019-11-01 | 江南大学 | A kind of preparation method and application for denitrification additional carbon |
| CN110395800B (en) * | 2019-08-27 | 2020-08-04 | 江南大学 | Preparation method and application of external carbon source for denitrification |
| CN110790249A (en) * | 2019-11-17 | 2020-02-14 | 南通职业大学 | Method and equipment for treating phosphorus-containing wastewater |
| CN110790249B (en) * | 2019-11-17 | 2024-02-27 | 南通职业大学 | Method and equipment for treating phosphorus-containing wastewater |
| CN113087333A (en) * | 2021-03-27 | 2021-07-09 | 同济大学 | Resource process for synchronously strengthening anaerobic acidogenesis and phosphorus recovery of sludge |
| CN115974350A (en) * | 2023-02-28 | 2023-04-18 | 重庆大学 | Method for enhancing residual sludge phosphorus release by ascorbic acid |
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