CN102774958A - Sewage and sludge treatment method for achieving good biological phosphorus removal and improving acid production of sludge - Google Patents
Sewage and sludge treatment method for achieving good biological phosphorus removal and improving acid production of sludge Download PDFInfo
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- CN102774958A CN102774958A CN2012102856915A CN201210285691A CN102774958A CN 102774958 A CN102774958 A CN 102774958A CN 2012102856915 A CN2012102856915 A CN 2012102856915A CN 201210285691 A CN201210285691 A CN 201210285691A CN 102774958 A CN102774958 A CN 102774958A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention relates to a sewage and sludge treatment method for achieving good biological phosphorus removal and improving acid production of the sludge. An ordinary sequencing batch reactor is adopted to treat the sewage, and an alkaline fermentation pool is utilized to ferment excess sludge generated in the sewage treatment process. The sewage and sludge treatment method particularly comprises enabling the sewage to enter the sequencing batch reactor, and directly performing aerobic aeration on the sewage; discharging a certain amount of mud water mixture, controlling sludge age, enabling supernatant to return to the sequencing batch reactor after the mud water mixture subsides, performing aerobic aeration and subsiding on the excess sludge, and draining water; enabling the excess sludge generated in the sequencing batch reactor to enter the alkaline fermentation pool after water draining is finished; starting an agitator, starting an automatic alkali-adding device, and enabling pH in the alkaline fermentation pool to be 10+/-0.1; and performing mud water separation after 4-day fermentation. According to the sewage and sludge treatment method, physicochemical properties of the excess sludge is controlled from a source of sewage treatment, yield of organic acid in the alkaline fermentation process of the excess sludge is improved, fermentation time is shortened, an organic matter part in the sewage is removed by microorganism accumulation simultaneously, the aeration amount is reduced, and sewage treatment running cost is reduced.
Description
Technical field
The present invention relates to a kind of sewage and method for sludge treatment of realizing the good biological dephosphorization and improving the acid of mud product, belong to environmental protection technical field.
Background technology
Municipal sludge is solid or the semi-solid sedimentable matter that sewage work produces in to sewage treatment process, has characteristics such as output is big, organic content is high, complicated component.If deal with improperly, very easily cause secondary pollution.It is the important directions of recycling sludge that anaerobic sludge digestion produces short chain fatty acid, has caused many investigators' concern this year.
Short chain fatty acid (comprising acetate, propionic acid etc.) is the preferential use carbon source that denitrogenation dephosphorizing is had a preference in the biological wastewater treatment process, the direct concentration that has determined nitrogen phosphorus in the sewage treatment facility water outlet of its content.Because short chain fatty acid content of (particularly in the southern area sewage) in China's sewage is lower, therefore, usually guarantee the high efficiency and stability of treatment facility denitrogenation dephosphorizing to have increased running cost greatly through adding ways such as acetate.
Contriver's early-stage Study shows: excess sludge can produce a large amount of short chain fatty acids (Environmental Science and Techlonogy, 2006,40 at the alkaline condition bottom fermentation; 2025-2029); The lipid acid that fermentation is produced is during as the supplementary carbon source of biological phosphate-eliminating technology, the phosphor-removing effect of system can be significantly improved (Environmental Science and Techlonogy, 2007; 41,7126-7130).At present, the research center of gravity of excess sludge product acid all concentrates on the condition optimizing and control of acid process both at home and abroad.
Research shows, Sludge System can produce the clustering phenomena (be that not direct oxidation of organism is carbonic acid gas and water in the sewage, store and absorbed in the body by bacterium) of ergastic substances under non-equilibrium condition, and these ergastic substances all can be by degraded fast.If the mud that can enrichment ergastic substances content is high in sewage treatment process and don't the processing power of impair system can not only reduce the running cost of WWT so, and can improve the acid producing ability of follow-up mud, has important practice significance.
Have report to show that the single-stage aerobic process can be under the processing condition of not setting the anaerobism section recent years, and Sludge System can realize good biological phosphate-eliminating through the suitable time of repose of reverse extending.The present invention is on the basis of this biological phosphate-eliminating technology; Develop a kind of excess sludge that can obtain higher energy storage thing content; Do not reduce the sewage treatment process of the last effect (particularly phosphor-removing effect) of Sewage treatment systems again; And this excess sludge carried out anaerobically fermenting in the alkaline fermentation pond, improved the ability of excess sludge fermentation and acid greatly.
Summary of the invention
The purpose of this invention is to provide a kind of sewage and method for sludge treatment of realizing the good biological dephosphorization and improving the acid of mud product.
Realization good biological dephosphorization that the present invention proposes and raising mud produce the sewage and the method for sludge treatment of acid; Handle by sewage and sludge treating system; Said treatment system is produced sour device by waste disposal plant and excess sludge and is formed; Said waste disposal plant is made up of water inlet pipe 1, rising pipe 4, shore pipe 6, sequencing batch reactor 7, aeration head 8, under meter 9 and air 11, and sequencing batch reactor 7 bottoms are provided with aeration head 8, and said aeration head 8 is through pipe connection under meter 9; Under meter 9 connects air 11 through blast main 10; Sequencing batch reactor 7 bottoms connect shore pipe 6 through spoil disposal valve 5, and sequencing batch reactor 7 middle parts connect rising pipe 4 through flowing water Valve 3, and sequencing batch reactor 7 connects water inlet pipe 1 through inlet valve 2; Said excess sludge produces sour device to be made up of alkaline fermentation pond 12, whisking appliance 13 and automatic adder-subtractor 14, and whisking appliance 13 inserts in the alkaline fermentation ponds 12 with automatic adder-subtractor 14; The operation method concrete steps of Sewage treatment systems are following:
(1), open inlet valve 2, sewage gets in the sequencing batch reactor 7 from water inlet pipe 1, after water to be advanced finishes, closes inlet valve 2.
(2), open air 11 aerobic aerations, the aerobic aeration time is 3.8-4.2h.
(3), when aerobic aeration 1h, open spoil disposal valve 5 and discharge a certain amount of mud mixture, make that activated sludge concentration is 2800-3200 mgL in the reactor drum
-1, mud mud age is 10-14d.Behind the mud mixture deposition 0.4-0.6h that discharges, supernatant returns and continues aeration in the sequencing batch reactor 7, and excess sludge entering alkaline fermentation pond is used for anaerobically fermenting and produces organic acid.
(4), after aerobic aeration finishes, close air 11 and finish aerations, deposition 0.9-1.1h is to realize mud-water separation.
(5), after deposition finishes, open water discharging valve 3, draining is closed water discharging valve 3 after finishing.
(6), sequencing batch reactor 7 is left standstill 6.5-7.5h, entire reaction period 12h.
(7), after excess sludge gets into alkaline fermentation pond 12, turn on agitator 13, rotating speed is 140-160 r/min.
(8), open automatic adder-subtractor 14, make that pH is controlled at 10 ± 0.1 in the alkaline fermentation pond 12.
(9), after excess sludge fermented 4 days, carry out mud-water separation in the alkaline fermentation pond, supernatant is for being rich in organic acid salt.
Key point in the above-mentioned operation method is to control the suitable spoil disposal time, so that under the prerequisite that does not influence wastewater treatment efficiency (particularly phosphor-removing effect), obtains to improve production organic acid excess sludge.The contriver shows that through a large amount of research spoil disposal can reach the ideal effect behind aerobic 1h.
The invention has the beneficial effects as follows:
(1) in the physico-chemical property of the source of WWT control excess sludge, improved the characteristic of organic acids produced by sludge, not only realized minimizing, the stabilization of mud, obtained more valuable product simultaneously;
(2) the organism part in the sewage is removed through microbial accumulation, reduced aeration rate, reduced WWT running cost.
Description of drawings
Fig. 1 is a kind of example structure synoptic diagram of the sewage-treating reactor (sequencing batch reactor) that adopts of the present invention.
Fig. 2 is a kind of example structure synoptic diagram of the sludge fermentation acidogenic reactor that adopts of the present invention.
Label among the figure: 1 is water inlet pipe, and 2 is inlet valve, and 3 is flowing water Valve, and 4 is rising pipe; 5 is the spoil disposal valve, and 6 is shore pipe, and 7 is sequencing batch reactor, and 8 is aeration head; 9 is under meter, and 10 is blast main, and 11 is air; 12 is the alkaline fermentation pond, and 13 is whisking appliance, and 14 is automatic adder-subtractor.
Embodiment
Contrast ordinary activated sludge technology excess sludge and aerobic/anaerobic technology excess sludge fermentation and acid are that example is explained the present invention below.
Embodiment 1:
As shown in Figure 1, waste disposal plant is common sequencing batch reactor, and is as shown in Figure 2, and it is the alkaline fermentation pond that used excess sludge produces sour device, and its operation method carries out as follows:
1, open inlet valve 2, sewage gets into sequencing batch reactor main body 7 from water inlet pipe 1, after water to be advanced finishes, closes inlet valve 2.
2, after water inlet finishes, open air 11 aerobic aerations, the aerobic aeration time is 4h.
3, when aerobic aeration 1h, open spoil disposal valve 5 and discharge a certain amount of mud mixture, making the interior activated sludge concentration of reactor drum is 3000 mgL
-1About, mud mud is about 12d age.Supernatant returns and continues aeration in the sbr reactor device main body 7 behind the mud mixture deposition 0.5h that discharges, and remaining mud is used for anaerobically fermenting and produces organic acid.
4, behind the aerobic aeration 4h, close air 11 and finish aeration, deposition 1h is to realize mud-water separation.
5, behind the deposition 1h, open water discharging valve 3, draining is closed water discharging valve 3 after finishing.
6, after draining finished, reactor drum left standstill 7h, entire reaction period 12h.
Mud produces the acid system operation method:
1, behind the excess sludge entering alkaline fermentation pond 12 that Sewage treatment systems produces, turn on agitator 13, rotating speed is 150 r/min.
2, open automatic adder-subtractor 14, make that pH is controlled at 10 ± 0.1 in the alkaline fermentation pond.
3, after excess sludge fermented 4 days in the alkaline fermentation pond, carry out mud-water separation, supernatant is for being rich in organic acid salt.
Handle the last effect of city domestic sewage and the contrast that the gained excess sludge produces acid by above-mentioned operation method and conventional activated sludge process.Water inlet COD is 300 ~ 350 mgL
-1, TN is 30 ~ 35mgL
-1, TP is 8 ~ 10 mgL
-1
The WWT result contrasts as follows after the steady running: above-mentioned operation method water outlet COD is 24 ~ 36mgL
-1, ammonia nitrogen is 0 ~ 3mgL
-1, TP is 0 ~ 0.92mgL
-1Conventional activated sludge process water outlet COD is 28 ~ 40mgL
-1, ammonia nitrogen is 0 ~ 4mgL
-1, TP is 6.74 ~ 8.81mgL
-1
The gained excess sludge all carries out anaerobically fermenting in working volume is the reactor drum of 600 mL.The time and the control condition of fermentation are identical: pH=10 ± 0.1, fermentation time are 4d, and leavening temperature is 20 ± 1 ℃.It is following to make the organic acid result: it is 301 mg COD/ g VSS that above-mentioned operation method gained mud produces sour result; It is 189 mg COD/ g VSS that conventional activated sludge process gained mud produces sour result.
Embodiment .2:
Press operation method and the last effect of aerobic/anaerobic art breading city domestic sewage and the contrast that the gained excess sludge produces acid of embodiment 1.Water inlet COD is 320 ~ 350 mgL
-1, TN is 30 ~ 32mgL
-1, TP is 9 ~ 10 mgL
-1
The WWT result contrasts as follows after the steady running: above-mentioned operation method water outlet COD is 24 ~ 32mgL
-1, ammonia nitrogen is 0 ~ 3.2mgL
-1, TP is 0 ~ 0.88mgL
-1Aerobic/anaerobic technology water outlet COD is 22 ~ 30mgL
-1, ammonia nitrogen is 0.26 ~ 5.68mgL
-1, TP is 0 ~ 0.79mgL
-1
The gained excess sludge all carries out anaerobically fermenting in working volume is the reactor drum of 600 mL.The time and the control condition of fermentation are identical: pH=10 ± 0.1, fermentation time are 4d, and leavening temperature is 20 ± 1 ℃.It is following to make the organic acid result: it is 308 mg COD/ g VSS that above-mentioned operation method gained mud produces sour result; It is 156 mg COD/ g VSS that conventional activated sludge process gained mud produces sour result.
Claims (1)
1. realize the good biological dephosphorization and improve sewage and the method for sludge treatment that mud produces acid; It is characterized in that handling by sewage and sludge treating system; Said sewage and sludge treating system produce sour device by waste disposal plant and excess sludge and form; Said waste disposal plant is made up of water inlet pipe (1), rising pipe (4), shore pipe (6), sequencing batch reactor (7), aeration head (8), under meter (9) and air (11); Sequencing batch reactor (7) bottom is provided with aeration head (8); Said aeration head (8) is through pipe connection under meter (9), and under meter (9) connects air (11) through blast main (10), and sequencing batch reactor (7) bottom connects shore pipe (6) through spoil disposal valve (5); Sequencing batch reactor (7) middle part connects rising pipe (4) through flowing water Valve (3), and sequencing batch reactor (7) connects water inlet pipe (1) through inlet valve (2); Said excess sludge produces sour device to be made up of alkaline fermentation pond (12), whisking appliance (13) and automatic adder-subtractor (14), and whisking appliance (13) and automatic adder-subtractor (14) insert in the alkaline fermentation pond (12); The operation method concrete steps of Sewage treatment systems are following:
(1), open inlet valve (2), sewage gets in the sequencing batch reactor (7) from water inlet pipe (1), after water to be advanced finishes, closes inlet valve (2);
(2), open air (11) aerobic aeration, the aerobic aeration time is 3.8-4.2h;
(3), when aerobic aeration 1h, open spoil disposal valve (5) and discharge a certain amount of mud mixture, make that activated sludge concentration is 2800-3200 mgL in the reactor drum
-1, mud mud age is 10-14d; Behind the mud mixture deposition 0.4-0.6h that discharges, supernatant returns and continues aeration in the sequencing batch reactor (7), and excess sludge entering alkaline fermentation pond is used for anaerobically fermenting and produces organic acid;
(4), after aerobic aeration finishes, close air (11) and finish aeration, deposition 0.9-1.1h is to realize mud-water separation;
(5), after deposition finishes, open water discharging valve (3), draining is closed water discharging valve (3) after finishing;
(6), sequencing batch reactor (7) is left standstill 6.5-7.5h, entire reaction period 12h;
(7), after excess sludge gets into alkaline fermentation pond (12), turn on agitator (13), rotating speed is 140-160 r/min;
(8), open automatic adder-subtractor (14), make that pH is controlled at 10 ± 0.1 in the alkaline fermentation pond (12);
(9), after excess sludge fermented 4 days, carry out mud-water separation in the alkaline fermentation pond, supernatant is for being rich in organic acid salt.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103214087A (en) * | 2013-04-25 | 2013-07-24 | 同济大学 | Method for enriching phosphorus by using aerobic granular sludge |
| CN103241917A (en) * | 2013-05-21 | 2013-08-14 | 淮海工学院 | Method for biologically removing phosphorus by using acid produced by mixing municipal sludge and organic wastes |
| CN103663890A (en) * | 2013-12-02 | 2014-03-26 | 北京工业大学 | Method for reinforcing acid production amount of residual sludge alkaline fermentation through adding NaCl |
| CN104193128A (en) * | 2014-08-03 | 2014-12-10 | 北京工业大学 | Method for strengthening alkaline fermentation sludge reduction of excess sludge by adding NaCl |
| CN104498352A (en) * | 2014-11-17 | 2015-04-08 | 北京工业大学 | Apparatus and method for producing acetic acid through alkaline fermentation of residual sludge which is reinforced by pretreatment of strong base |
| CN107117704A (en) * | 2017-06-28 | 2017-09-01 | 扬州大学 | The sequencing batch active sludge of low sludge yield |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1635125A (en) * | 2004-10-19 | 2005-07-06 | 同济大学 | Process for preparing organic acid from surplus sludge |
| CN101289248A (en) * | 2008-06-06 | 2008-10-22 | 湖南大学 | Operation method of non-anaerobic segment biological dephosphorization of sequencing batch reactor |
| CN101391839A (en) * | 2008-11-06 | 2009-03-25 | 北京城市排水集团有限责任公司 | Aerobic sludge age control device for sewage disposal plant and method |
| WO2011143169A2 (en) * | 2010-05-11 | 2011-11-17 | Pmc Biotec Company | Biological process for converting organic by-products |
-
2012
- 2012-08-13 CN CN201210285691.5A patent/CN102774958B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1635125A (en) * | 2004-10-19 | 2005-07-06 | 同济大学 | Process for preparing organic acid from surplus sludge |
| CN101289248A (en) * | 2008-06-06 | 2008-10-22 | 湖南大学 | Operation method of non-anaerobic segment biological dephosphorization of sequencing batch reactor |
| CN101391839A (en) * | 2008-11-06 | 2009-03-25 | 北京城市排水集团有限责任公司 | Aerobic sludge age control device for sewage disposal plant and method |
| WO2011143169A2 (en) * | 2010-05-11 | 2011-11-17 | Pmc Biotec Company | Biological process for converting organic by-products |
Non-Patent Citations (2)
| Title |
|---|
| 《Environmental Science & Technology》 20060211 HONGYING YUAN et al Improved bioproduction of short -chain fatty acids (SCFAs) from excess sludge under alkaline condtions 2025-2029 1 第40卷, 第6期 * |
| HONGYING YUAN ET AL: "Improved bioproduction of short –chain fatty acids (SCFAs) from excess sludge under alkaline condtions", 《ENVIRONMENTAL SCIENCE & TECHNOLOGY》, vol. 40, no. 6, 11 February 2006 (2006-02-11), pages 2025 - 2029 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103214087A (en) * | 2013-04-25 | 2013-07-24 | 同济大学 | Method for enriching phosphorus by using aerobic granular sludge |
| CN103241917A (en) * | 2013-05-21 | 2013-08-14 | 淮海工学院 | Method for biologically removing phosphorus by using acid produced by mixing municipal sludge and organic wastes |
| CN103663890A (en) * | 2013-12-02 | 2014-03-26 | 北京工业大学 | Method for reinforcing acid production amount of residual sludge alkaline fermentation through adding NaCl |
| CN103663890B (en) * | 2013-12-02 | 2015-07-08 | 北京工业大学 | Method for reinforcing acid production amount of residual sludge alkaline fermentation through adding NaCl |
| CN104193128A (en) * | 2014-08-03 | 2014-12-10 | 北京工业大学 | Method for strengthening alkaline fermentation sludge reduction of excess sludge by adding NaCl |
| CN104498352A (en) * | 2014-11-17 | 2015-04-08 | 北京工业大学 | Apparatus and method for producing acetic acid through alkaline fermentation of residual sludge which is reinforced by pretreatment of strong base |
| CN107117704A (en) * | 2017-06-28 | 2017-09-01 | 扬州大学 | The sequencing batch active sludge of low sludge yield |
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