CN104098245A - Sludge source reduction treatment method and device - Google Patents
Sludge source reduction treatment method and device Download PDFInfo
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- CN104098245A CN104098245A CN201310113562.2A CN201310113562A CN104098245A CN 104098245 A CN104098245 A CN 104098245A CN 201310113562 A CN201310113562 A CN 201310113562A CN 104098245 A CN104098245 A CN 104098245A
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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
- Y02W10/20—Sludge processing
Abstract
The invention discloses a sludge source reduction treatment method and a device. The method includes: subjecting a sludge and sewage mixed solution to complete aeration and mixing in an aerobic biochemical pool, introducing the effluent solution into a precipitation pool to undergo precipitation, bringing out the supernatant, and periodically extracting quantitative precipitated sludge from the precipitation pool, making the quantitative precipitated sludge enter a pre-anoxic reaction pool and then enter an anaerobic reactor through the pre-anoxic reaction pool to undergo reaction, then extracting equivalent sludge and leading it into a pre-aeration reaction pool to undergo aeration mixing for 2-8h, then extracting an equivalent sludge mixed solution from the pre-aeration reaction pool to supplement the aerobic biochemical pool, thus finishing cyclic exchange flow of the sludge among precipitation-pre-anoxic-anaerobic-pre-aeration-aerobic-precipitation equipment. The method and the device provided by the invention have the advantages that: the sludge reduction effect is good and stable, the nitrogen removal ability of the technological system is enhanced, and the newly added pre-aeration reaction pool strengthens the nitrification function of the system, so that more nitrogen pollutants are converted to nitrate nitrogen and then can be removed in the anaerobic reactor, construction and transformation are easy, and the building cost is low, thus having long-term economic benefits.
Description
Technical field
The present invention relates to a kind of sewage treatment process, especially relate to excess sludge reduction treatment process.
Background technology
The sewage disposal cause of China had reached development fast in recent years, and the biological treatment taking activated sludge process as main body is widely used in the municipal sewage treatment process of various scales because it has compared with high organic pollutant removal effect.Meanwhile, because urban wastewater treatment firm almost all adopts various forms of activated sludge processes as treatment process, will inevitably produce a large amount of excess sludges.At present, the excess sludge total amount of China's municipal wastewater treatment plant generation is huge, rapid development, there is no more appropriate treatment process, and it is high to process disposal costs.In addition, in mud, contain the hazardous and noxious substances such as heavy metal, various organism and bacterium, if do not dealt carefully with disposal, will cause serious secondary pollution.Therefore, the processing of China's excess sludge, handling problems allow of no optimist.
Show according to firmly building in portion's " about circular of the construction of the national town sewage treatment facility first quarter in 2011 and running condition ", by in by the end of March, 2011, each city, the whole nation, county's accumulative total are built up 2996 of urban wastewater treatment firms, and processing power reaches 1.33 hundred million m3/d.By every ten thousand m
3sewage after treatment sludge creation amount (by water ratio 80%) is about 5-10 t calculating, and the sludge creation amount of national every day is about ten thousand tons of 6.55-13.3, is about ten thousand tons of 2390-4854 the whole year.According to statistics and report, realize the harmless treatment of mud, the processing cost of the U.S. is 1000 yuans of dewatered sludges per ton, approximately 2500 yuan, Japan, and 3400 ~ 7300 yuan, some country in Europe, and will continue rising.
Excess sludge is a kind of Solid hazardous waste of complicated component, is solid-state or semi-solid state, and viscosity is large, and water ratio is high.In mud, both contain the plant nutrient ingredients such as nitrogen, phosphorus, organic matter, also contained the poisonous and harmful elements such as a large amount of organic pollutants, heavy metal, pathogenic bacteria, parasitic ovum.If process mishandlingly, be easy to cause secondary pollution.The method for sludge treatment generally adopting is at present that it is 80% left and right that mud is processed to water ratio with mechanical dewatering equipment, then does ultimate disposal in the mode of simple landfill, stacking.Land-fill method will occupy a large amount of using areas, simultaneously due to the higher water ratio of mud itself, when simple landfill, can there is landfill yard landslide cave in accident, can make produce more percolate and environment is caused to serious secondary pollution after landfill simultaneously, also make the normal service life of landfill yard be subject to certain impact.In February, 2009, No. 3 sludge pits of lower level ground Solid Waste Landfills of Shenzhen clear water river are too much just because of the mud of landfill, caused piping accident." urban wastewater treatment firm sludge treatment dispose and pollution prevention technique policy (try) " regulation of implementing on February 18th, 2009, " nationally will progressively limit mud without inorganicization processing at refuse landfill landfill; Mud before landfill need carry out stabilization treatment; Sludge landfill should meet the regulation of " urban wastewater treatment firm sludge disposal mixing landfill shale " (CJ/T 249) ", the processing of mud is disposed and proposed higher technical requirements.
In addition, mud mainly contains recycling (brickmaking, compost etc.), soil utilization and burning etc., these methods have all obtained application under certain condition, but these methods all exist many restrictions that are difficult at present the problem of effectively solution and further developed.Can farm crop be produced and be poisoned because of a large amount of pathogeny bacterium and unstable organism as mud is directly applied to farmland; After (aerobic or anaerobism) compost, as fertilizer sources still can have because of the existence of heavy metal potential harm for agricultural; Burn also because water ratio is high, low to make to burn usefulness low for calorific value, and secondary pollution is serious.
Because recycling sludge at home exists various temporary transient insurmountable key links, the large-scale promotion of resource technology is subject to certain restrictions, simultaneously, due to the existence of various pollution substances in mud (heavy metal, organism, pathogenic micro-organism) etc., make mud cannot become " useful resources " of real meaning, and produce " real economic benefit ".
Therefore, how making sludge treatment reach minimizing, innoxious, stabilization and resource utilization, is the important topic of nowadays needing solution in sewage treatment process badly.And minimizing is undoubtedly all necessary top-priority most critical links of any sludge treatment disposal options.
Therefore, from the theory of cleaner production and evaluation of life cycle, by utilizing physics, chemistry or biological means, administer from the source of sewage work, the biosolids amount that whole Sewage treatment systems is produced and outwards discharge reaches minimum, thereby reduce generation and the treatment capacity of mud, reduce cost of sewage disposal, realize the source decrement of mud.
China belongs to developing country; numerous domestic Technological Economy backward areas; coordinate mutually with environment protection for ensureing Economic development; need to promote the few sewage treatment process of operation sludge yield; the mud source reduction problem of the activated sludge process that therefore research is most widely used just has high meaning; can be from source reduction sludge creation amount, be a kind of novel process for cleanly preparing, have great importance for the state of the art that improves whole sewage treatment industry.
Summary of the invention
The object of this invention is to provide a kind of mud source decrement successful, construction retrofit easily, mud source decrement processing apparatus that Construction and operation cost is low.
Another object of the present invention is to provide a kind of mud decrement successful, mud source decrement treatment method that running cost is low.
Technical solution of the present invention is: a kind of mud source decrement treatment method and device, comprise aerobic biochemical pool, settling tank and anaerobic reactor, it is also provided with pre-hypoxia response pond and preaeration reaction tank, the outlet of wherein said aerobic biochemical pool connects the entrance of described settling tank, the outlet of described settling tank connects the entrance in described pre-hypoxia response pond, the outlet in described pre-hypoxia response pond connects the entrance of described anaerobic reactor, the outlet of described anaerobic reactor connects the entrance of preaeration reaction tank, the outlet of preaeration reaction tank connects the entrance of described aerobic biochemical pool.
The present invention is on the basis of original OSA process unit, before anaerobic reactor, increase a pre-anoxic reacter, after anaerobic reactor, increase a preaeration reactor, form IOSA new device, its essence is in the pre-anoxic reacter of mud suction of settling tank bottom, consume most of residual oxygen, then enter in anaerobic reactor, under anaerobic react for some time, by short-time aeration reaction in the muddy water mixed solution suction preaeration reaction tank in anaerobic reactor, mud mixed liquid after aeration fills in aerobic biochemical reaction tank and continues biochemical treatment sewage, thereby realize the effect of mud decrement, and the denitrification effect of water outlet is better than existing OSA technique.
Described anaerobic reactor is the anaerobic digestion device with whipping appts.Utilize the denitrifying capacity that anaerobic reactor is stronger, alleviate nitrate pollution burden in aerobic biochemical pool, strengthened the ability of denitrogenating of whole device simultaneously.
Described pre-hypoxia response pond is hypoxia response pond, simple in structure, easy to operate.
Described preaeration reaction tank is aerobic aeration reaction tank, simple in structure, easy to operate.
A kind of mud source decrement treatment method, mud and sewage mixed solution enter after the mixing of the interior fully aeration of aerobic biochemical pool, introduce precipitation in settling tank, supernatant liquor is drawn, and the quantitative precipitating sludge periodically extracting in settling tank enters in pre-hypoxia response pond, then enter under anaerobic reaction in anaerobic reactor, then extract equivalent mud out and introduce the interior aeration mixing of preaeration reaction tank after 2-8 hour, from preaeration reaction tank, extracting equivalent mud mixed liquid fills in aerobic biochemical pool, completing mud flows in the circulation exchange of precipitation-pre-anoxic-anaerobism-preaeration-aerobic-precipitate between each equipment.
In the methods of the invention, the pre-hypoxia response pond of newly inserting and preaeration reaction tank are its key links that is different from OSA technique, and it can realize the function of following several respects:
(1) reduce the impact of mud to system.Mud is behind pre-hypoxia response pond, and wherein most oxygen is consumed totally, can reduce the impact to anaerobic reactor after entering anaerobic reactor, improves the efficiency of anaerobic reaction.
(2) activation anaerobion.OSA technique has been inserted anaerobic reaction unit in sludge reflux section, change in fact the living environment of microorganism in traditional activated sludge process, make microorganism constantly in the alternate cycles in Aerobic-anaerobic, make in OSA part microorganism because being not suitable with the transition of periodic environment, reduce its biological activity and even caused the death of effective microbe, thereby weakened system sewage treatment capacity.The insertion of preaeration reactor, the stage that makes microorganism exist a buffering to adapt in anaerobism and the aerobic process replacing, by the mud mixed liquid that goes out stream from detest reactor is carried out to short-time aeration, activate in advance anaerobion, make it adapt in advance aerobic environment, strengthen firm biological activity, improve system sewage treatment capacity.
(3) alleviate aerobic biochemical reaction tank organism burden.In OSA technique, for to reach certain sludge reduction effect, the sludge retention time of anaerobic reactor is often longer; Simultaneously due to the dissociation of cell endogenous respiration, self decline death and extracellular polymeric etc., the release that can bring part flco polymer substance.Thereby, be back to and in the mud mixed liquid aerobic environment, contain a large amount of organism (Nitrogen-and Phosphorus-containing pollutent is interior) from anaerobic reactor, comprise the material of biodegradable and difficult for biological degradation, virtually increased the weight of the processing load of aerobic system, this is also one of reason causing the deterioration of system sewage disposal performance.Preaeration reaction tank is by strong aeration effect, can strengthen the ability of microbiological oxidation decomposing organic matter, the material of some difficult for biological degradation is likely converted into easy biodegradable material at this one-phase, also can remove the organism in anaerobism backflow mixed liquor simultaneously, the organism burden that has alleviated aerobic reaction pond, makes system performance more stable; The reaction tank of preaeration simultaneously has also been strengthened the nitrification function of system, in the mud mixed liquid flowing out, contain a large amount of nitrogen pollutants and can be converted into relatively easily nitric nitrogen from anaerobic reactor in preaeration reaction tank, then through the pump around circuit of mud, utilize denitrification stronger in anaerobic reactor to be removed, when alleviating aerobic biochemical reaction tank nitrate pollution burden, also strengthened the ability of denitrogenating of system.
(4) enhanced system sludge reduction usefulness.In the preaeration reaction tank of newly inserting and activated sludge process, traditional aerobic reaction pond is distinguished to some extent, it does not have extraneous organic inflow, therefore in this reaction tank, microorganism mainly utilizes the organism that decomposes self to go to maintain its existence, is equivalent to an aerobic sigestion junior unit.In OSA technique, insert preaeration reactor, itself and anaerobic reactor are joined together, be equivalent to form a kind of anaerobic-aerobic combined sludge digestion technique unit, and combining of anaerobic-aerobic digestion is a kind of process combination organism to good removal effect, function of sludge reduction that thus can enhanced system.
Mud is aeration mixing 2-8 hour in described preaeration reaction tank, and dissolved oxygen concentration is 2-3mg/L.Its structural unit framework is simple, is convenient to carry out every day the arrangement of sludge circulation exchange reflux cycle, and running cost is suitable.
Advantage of the present invention is: sludge reduction is effective and stable, strengthen the ability of denitrogenating of process system, newly-increased preaeration reaction tank, strengthen the nitrification function of system, make more nitrogen pollutant be converted into nitre nitrogen, then in anaerobic reactor, removed, construction retrofit is easy, building cost is low, has long-range economic benefit.
Brief description of the drawings
The structural representation that accompanying drawing 1 is the embodiment of the present invention;
The experimental system schematic diagram that accompanying drawing 2 is the embodiment of the present invention;
1, sewage, 2, aerobic biochemical pool, 3, aerobic biochemical pool goes out to flow mud mixed liquid, 4, settling tank, 5, water outlet, 6, settling tank goes out to flow mud, 7, anaerobic reation pool (having comprised pre-hypoxia response part), 8, anaerobic reactor goes out to flow mud, 9, preaeration reaction tank, 10, preaeration goes out to flow mud, 11, aerobic reaction pond, 12, aerobic reaction pond, 13, anaerobic reactor, 14, anaerobic reactor, 15, preaeration reaction tank, 16, intake pump, 17, go out water pump, 18, aerobic sludge reflux pump, 19, anaerobic sludge reflux pump, 20, preaeration sludge reflux pump, 21, aerobic sludge reflux pump, 22, anaerobic sludge reflux pump, 23, former bucket.
Embodiment
Embodiment:
Consult Fig. 1, a kind of mud source decrement treatment method and device, formed by aerobic biochemical pool 2, settling tank 4 and anaerobic reactor 7 and preaeration reaction tank 9, wherein the outlet of aerobic biochemical pool 2 connects the entrance of settling tank 4, the outlet of settling tank 4 connects the entrance of anaerobic reactor 7, the outlet of anaerobic reactor 2 connects the entrance of preaeration reaction tank 9, and the outlet of preaeration reaction tank 9 connects the entrance of aerobic biochemical pool 2.
Anaerobic reactor 9 is for to have the anaerobic digestion device of whipping appts, and contains pre-anoxic part.Preaeration reaction tank is aerobic aeration reaction tank.
A kind of excess sludge decrement treatment method, sewage 1 enters and in aerobic biochemical pool 2, carries out sufficient aeration mixing, aerobic biochemical pool goes out to flow mud mixed liquid 3 and introduces the interior precipitation of settling tank 4, supernatant liquor is drawn as water outlet 5, periodically extracting quantitative settling tank in settling tank 4 goes out to flow mud 6 and enters in anaerobic reactor 7, under anaerobic react, extraction equivalent anaerobic reactor goes out to flow mud 8 and introduces the interior aeration mixing of preaeration reaction tank 9 after 2-8 hour, from preaeration reaction tank, extracting equivalent preaeration goes out to flow mud 10 and enters in aerobic biochemical pool 2, completing mud flows in the circulation exchange of precipitation-anaerobism-preaeration-aerobic-precipitate between each equipment.Mud aeration in described preaeration reaction tank mixes 12 hours, and dissolved oxygen concentration is 2-3mg/L.
Below further illustrate by experiment beneficial effect of the present invention.
Aerobic-precipitation-anaerobism (OSA) technique is in sewage treatment process, to realize a kind of novel process of sludge reduction simultaneously, has been proved and can affected under the prerequisite of effluent quality, realizes 40%～80% mud decrement effect.OSA process quilt is thought the very promising method of sludge reduction.The difference of OSA technological basis background activity mud technique and there is different forms, SBR (sequencing batch reactor) process structure is simple, convenient operation and management, be easier to realize structure and the operation of experiment indoor heating system, therefore in this research we to select SBR be this bottom technique, build the research that the OSA technological experiment system of SBR type is correlated with.
OSA technique is equal at the aerobic sludge reflux section of traditional activated sludge process has inserted an anaerobic reactor, when this brings sludge reduction effect for system, also brought extra pollutent burden to aerobic system, thereby made its sewage disposal operating performance unstable, effluent quality worsens.And traditional OSA technique, due to anaerobic reactor overstand, causes its volume larger, and cost is higher.Therefore this research is taking SBR-OSA technique as basis, traditional OSA technique is optimized to improvement, inserts preaeration reactor in short-term at anaerobic sludge reflux section, form novel SBR-OOSA technique, to passing through preaeration effect in short-term, improve raising system sewage disposal performance; Also wish further to strengthen OSA system sludge minimizing usefulness by this combination of anaerobism-preaeration in short-term, shorten sludge retention time in anaerobic reactor, reduce costs simultaneously.
This experimental construction SBR-OSA and SBR-OOSA two overlap process system and carry out comparative study.
Fig. 2 is the schematic diagram of experimental system, wherein at the interior configuration synthetic sewage of former bucket 23, Fig. 2 upper right side is SBR-OOSA process modeling system, it is a kind of OSA novel process of modified form, in SBR system, insert anaerobic reactor 13 and preaeration reactor 15, each cycle is regularly carried out the mud exchange of SBR aerobic reaction pond 11, anaerobic reactor 13 and preaeration reactor cell 15.Mud exchange essence is that the quiet heavy mud of SBR is introduced in anaerobic reactor 13, enters into preaeration reactor cell 15 after staying for some time, and turns back in aerobic reaction pond 11 and continue biochemical treatment sewage after the preaeration of a few hours.
In Fig. 2, lower right is SBR-OSA process modeling system, is a kind of traditional OSA technique, uses as the control experiment system of SBR-OOSA.In SBR system, insert anaerobic reactor 14, each cycle is regularly carried out the mud exchange between anaerobic reactor and preaeration reactor.Mud exchange essence is that the quiet heavy mud of SBR is introduced in anaerobic reactor 14, turns back in aerobic reaction pond 12 and continue biochemical treatment sewage after staying for some time.
In this research, experimental system adopts the mode of the continuous dynamic operation of 24h every day, one day 4 cycle of operation, and each cycle 6h, wherein each cycle comprises into water, aeration, precipitation, water outlet, mud exchange, idle 6 stages totally.Carry out the setting of the each phases-time program of each cycle by time automatic control equipment.For technique is overlapped in comparative study two, in this experiment, two cover experimental systems adopt identical timing control program, synchronous operation simultaneously, the impact causing to get rid of different operational conditionss.Each cycle sequential arranges in table 1.
Table 1 experimental system sequential arranges
As shown in table 1, each cycle water inlet 1h, starts aeration when water inlet, and aeration and fill phase have the time interleaving of 1h, and aeration duration is 3.5h altogether.
Water outlet and turnover mud separately carry out, and have certain safe time space between the two, prevent because the precision of time schedule controller causes sludge loss.
In like manner, in mud exchange process, same reactor enters mud and mud extraction is separately carried out, and has certain safe time space between the two, prevents from exchanging short stream because the precision of time schedule controller causes mud.
Above-listed detailed description is for the illustrating of one of the present invention possible embodiments, and this embodiment is not in order to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and all should be contained in the scope of the claims of this case.
Claims (6)
1. a mud source decrement processing apparatus, comprise aerobic biochemical pool, settling tank and anaerobic reactor, it is characterized in that: it is also provided with pre-hypoxia response pond and preaeration reaction tank, the outlet of wherein said aerobic biochemical pool connects the entrance of described settling tank, the outlet of described settling tank connects the entrance in described pre-hypoxia response pond, the outlet in affiliated pre-hypoxia response pond connects the entrance of described anaerobic reactor, the outlet of described anaerobic reactor connects the entrance of preaeration reaction tank, and the outlet of preaeration reaction tank connects the entrance of described aerobic biochemical pool.
2. a kind of mud according to claim 1 source decrement processing apparatus, is characterized in that: described anaerobic reactor is the anaerobic digestion device with whipping appts.
3. a kind of mud according to claim 1 and 2 source decrement processing apparatus, is characterized in that: described pre-hypoxia response pond is the hypoxia response pond with mechanical stirring device.
4. a kind of mud according to claim 1 and 2 source decrement processing apparatus, is characterized in that: described preaeration reaction tank is aerobic aeration reaction tank.
5. an excess sludge decrement treatment method, is characterized in that, comprises the following steps:
(1) mud and sewage mixed solution enter after the mixing of the interior fully aeration of aerobic biochemical pool, introduce in settling tank and precipitate, and supernatant liquor is drawn;
(2) periodically extracting quantitative precipitating sludge in settling tank enters and in pre-hypoxia response pond, consumes most oxygen in mud;
(3) in pre-hypoxia response pond, reacted mud enters under anaerobic reaction in anaerobic reactor, quiet heavy, then extract equivalent mud out and introduce the interior aeration mixing of preaeration reaction tank after 2-8 hour, from preaeration reaction tank, extract equivalent mud mixed liquid and fill in aerobic biochemical pool;
(4) sludge reflux of extracting anaerobic reation pool moderate out every 3 days, to aerobic biochemical reaction tank, completes mud and flows in the circulation exchange of precipitation-pre-anoxic-anaerobism-preaeration-aerobic-precipitate between each equipment.
6. a kind of mud according to claim 5 source decrement treatment method, it is characterized in that: mud is aeration mixing 2-8 hour in described preaeration reaction tank, and dissolved oxygen concentration is 2-3mg/L.
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| CN201310113562.2A CN104098245A (en) | 2013-04-03 | 2013-04-03 | Sludge source reduction treatment method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645711A (en) * | 2016-01-08 | 2016-06-08 | 上海电力学院 | Side-flow-type sludge in-situ reduction membrane-bioreactor system |
| CN109455813A (en) * | 2018-12-28 | 2019-03-12 | 肇庆市鹏凯环保装备有限公司 | A kind of reaction unit with metazoa decrement excess sludge |
| CN109607848A (en) * | 2018-11-23 | 2019-04-12 | 临猗县鑫得利纺织印染有限公司 | Wetland waste water reuse system |
| CN117069332A (en) * | 2023-09-27 | 2023-11-17 | 中山大学 | Sewage treatment device with low sludge yield and process method |
-
2013
- 2013-04-03 CN CN201310113562.2A patent/CN104098245A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645711A (en) * | 2016-01-08 | 2016-06-08 | 上海电力学院 | Side-flow-type sludge in-situ reduction membrane-bioreactor system |
| CN109607848A (en) * | 2018-11-23 | 2019-04-12 | 临猗县鑫得利纺织印染有限公司 | Wetland waste water reuse system |
| CN109455813A (en) * | 2018-12-28 | 2019-03-12 | 肇庆市鹏凯环保装备有限公司 | A kind of reaction unit with metazoa decrement excess sludge |
| CN117069332A (en) * | 2023-09-27 | 2023-11-17 | 中山大学 | Sewage treatment device with low sludge yield and process method |
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Application publication date: 20141015 |