CN111320276A - High-concentration organic wastewater and nitrogen and phosphorus removal intelligent treatment system and treatment method thereof - Google Patents
High-concentration organic wastewater and nitrogen and phosphorus removal intelligent treatment system and treatment method thereof Download PDFInfo
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- CN111320276A CN111320276A CN202010278665.4A CN202010278665A CN111320276A CN 111320276 A CN111320276 A CN 111320276A CN 202010278665 A CN202010278665 A CN 202010278665A CN 111320276 A CN111320276 A CN 111320276A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000011282 treatment Methods 0.000 title claims abstract description 44
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000011574 phosphorus Substances 0.000 title claims abstract description 39
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 39
- 239000002351 wastewater Substances 0.000 title claims abstract description 30
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000010865 sewage Substances 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 102
- 239000010802 sludge Substances 0.000 claims description 101
- 238000005273 aeration Methods 0.000 claims description 96
- 238000004062 sedimentation Methods 0.000 claims description 76
- 230000029087 digestion Effects 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 235000016709 nutrition Nutrition 0.000 claims description 5
- 230000035764 nutrition Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 24
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 230000001079 digestive effect Effects 0.000 description 30
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 30
- 238000010992 reflux Methods 0.000 description 23
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000010815 organic waste Substances 0.000 description 3
- 239000002957 persistent organic pollutant Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000011221 initial treatment Methods 0.000 description 2
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- 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
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- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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Abstract
The invention belongs to the technical field of wastewater treatment, and particularly discloses an intelligent treatment system for high-concentration organic wastewater and nitrogen and phosphorus removal. The invention also discloses a treatment method of the high-concentration organic wastewater and the nitrogen and phosphorus removal intelligent treatment system. The technical scheme is suitable for treating high-concentration COD organic wastewater, can efficiently achieve the effects of denitrification and dephosphorization according to the sewage treatment principle, and can meet the standard discharge of total nitrogen and total phosphorus in a sewage treatment system.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to an intelligent treatment system and method for high-concentration organic wastewater and nitrogen and phosphorus removal.
Background
With the acceleration of urban development and industrialization, a large amount of domestic sewage, industrial wastewater and farmland surface water runoff are converged into lake water, rivers, reservoirs and gulf water areas, so that other plants such as algae are propagated in a large amount, and the water body is rich in nutrition, so that sewage treatment becomes a hot point problem of key attention of people, and especially for countries such as China where water resources are scarce, strict control of over-standard discharge of nitrogen and phosphorus sewage is urgent.
The high-concentration organic wastewater contains a large amount of macromolecular organic matters such as carbohydrate, fat, protein, cellulose and the like, and is mainly characterized in that: the concentration of organic pollutants is high, the COD value is generally more than 2000mg/L, some COD values even reach tens of thousands to hundreds of thousands mg/L, the components are very complex and difficult to degrade, the organic pollutants usually contain toxic substances such as aromatic compounds, heterocyclic compounds and the like, and simultaneously, sulfides, nitrides, heavy metals, toxic organic matters and the like can be accompanied; the high-concentration organic wastewater has high chromaticity, is often accompanied by pungent odor such as stink and the like, and causes adverse effects on the surrounding environment; the high-concentration organic wastewater has relatively high pH value and is often strongly corrosive.
The high-concentration organic wastewater has great harm to the environment, and is mainly shown in the following aspects: firstly, the organic pollutants consume most of oxygen in the water body in the process of biodegradation, so that the water body is anoxic, aquatic animals and plants die, and stink is generated; secondly, sensory pollution, organic wastewater can cause great influence on the normal life of residents nearby the water body; moreover, the organic wastewater with high concentration contains many toxic organic matters, and serious pollution is caused to water and soil due to the accumulation of the organic wastewater for a long time, thereby threatening the health of human beings.
In the prior art, the treatment of high-concentration organic wastewater is mostly directly carried out by adopting a traditional biochemical system, and the high-concentration organic wastewater is difficult to achieve good treatment effect and national standard discharge.
Disclosure of Invention
The invention aims to provide an intelligent treatment system and an intelligent treatment method for high-concentration organic wastewater and nitrogen and phosphorus removal, which are suitable for treating high-concentration COD organic wastewater, can efficiently achieve the effects of nitrogen and phosphorus removal according to a sewage treatment principle, and can meet the standard discharge of total nitrogen and total phosphorus in a sewage treatment system.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an intelligent treatment system for high-concentration organic wastewater and nitrogen and phosphorus removal comprises a first section of anaerobic reactor and a second section of anaerobic reactor, wherein the first section of anaerobic reactor is sleeved outside the second section of anaerobic reactor, and the first section of anaerobic reactor and the second section of anaerobic reactor are separated by a wall;
an anaerobic closed rotational flow water distribution device which is vertically arranged is arranged in the second section of anaerobic reactor; the anaerobic closed rotational flow water distribution device comprises a branch pipe;
the anaerobic closed cyclone water distribution device is characterized by further comprising a water inlet pipeline, the water inlet pipeline is communicated with the upper portion of the anaerobic closed cyclone water distribution device, one end of the branch pipe is connected to the lower portion of the anaerobic closed cyclone water distribution device, and the other end of the branch pipe penetrates through the wall between the first section of anaerobic reactor and the second section of anaerobic reactor and faces the wall of the second section of anaerobic reactor.
The invention also discloses a treatment method of the high-concentration organic wastewater and nitrogen and phosphorus removal intelligent treatment system, which comprises the following steps:
s1, first stage anaerobic reactor → second stage anaerobic reactor: introducing sewage into the upper part of an anaerobic closed type rotational flow water distribution device, entering a first section of anaerobic reactor through a branch pipe at the bottom of the anaerobic closed type rotational flow water distribution device, then overflowing from the first section of anaerobic reactor, entering the top of a second section of anaerobic reactor, and then discharging water from the bottom of the second section of anaerobic reactor;
s2, introducing the sewage obtained in the step S1 into a first-stage aeration tank, and controlling the dissolved oxygen content in the first-stage aeration tank to be 2-5 mg/L; refluxing the digestion liquid in the first-stage aeration tank to a first-stage anaerobic reactor, performing first-stage denitrification, and then entering a second-stage anaerobic reactor for denitrification and denitrification treatment;
s3, introducing the sewage obtained in the step S2 into a first-stage sedimentation tank for sludge-water separation; returning the sludge precipitated in the first-stage sedimentation tank to the second-stage anaerobic reactor, and fully mixing the sludge in the second-stage anaerobic reactor with sewage by adopting rotational flow water inflow;
s4, introducing the sewage obtained in the step S3 into a second-stage anoxic tank, and performing phosphorus release reaction to ensure that the nutrition ratio in the sewage is kept at C: N: P: 100:5: 1;
s5, introducing the sewage obtained in the step S4 into a second section of aeration tank;
s6, introducing the sewage obtained in the step S5 into a second-stage sedimentation tank for sludge-water separation; the sludge precipitated in the first section of sedimentation tank enters the second section of anaerobic reactor through the rotational flow of the sludge return pipe.
Preferably, the number of the branch pipes is four, and the four branch pipes face four corners of the second section of anaerobic reactor respectively.
Preferably, the anaerobic closed cyclone water distribution device sequentially comprises a first section aeration tank, a first section sedimentation tank, a second section anoxic tank, a second section aeration tank and a second section sedimentation tank, wherein a sludge return pipe is arranged between the second section anaerobic reactor and the first section sedimentation tank, and the sludge return pipe is communicated with the upper part of the anaerobic closed cyclone water distribution device.
Preferably, a digestion liquid return pipe is arranged between the top of the first-stage anaerobic reactor and the first-stage aeration tank, and the digestion liquid return pipe is communicated with the upper part of the anaerobic closed type rotational flow water distribution device.
The beneficial effects of this technical scheme do:
(1) the invention is suitable for treating high-concentration COD (chemical oxygen demand) organic wastewater, can efficiently achieve the effects of denitrification and dephosphorization according to the sewage treatment principle, and can meet the standard discharge of total nitrogen and total phosphorus in a sewage treatment system.
(2) The sewage is introduced into the anaerobic closed type rotational flow water distribution device from the upper part, and is sprayed to the side wall (or four corners) of the second section of anaerobic reactor from the branch pipes at the lower part of the anaerobic closed type rotational flow water distribution device, so that the stirring effect can be achieved, the sewage can be subjected to anaerobic primary treatment, and the hydrolysis effect can be achieved.
(3) Firstly, sewage sequentially passes through a first section anaerobic reactor → a second section anaerobic reactor → a first section aeration tank → a first section sedimentation tank → a second section anoxic tank → a second section aeration tank → a second section sedimentation tank.
① sewage enters the first section anaerobic reactor by the water inlet pipe, the anaerobic closed rotational flow water distribution device and the branch rotational flow, then overflows and enters the second section anaerobic reactor from the top.
② the sewage is aerated in the first section aeration tank, because the invention treats high concentration COD organic waste water, in order to better remove COD in the water, the dissolved oxygen amount of the first section aeration tank is ensured, according to continuous exploration and practice, the applicant finds that the COD removing efficiency of the first section anaerobic reactor and the second section anaerobic reactor is very high, which can reach more than 80%, but the COD of the water discharged from the second section anaerobic reactor is still very high, only oxygen is supplemented into the first section aeration tank, and the dissolved oxygen content is controlled at 2-5mg/L, the sludge activity of the first section aeration tank can be obviously improved.
③ what this patent was handled is high concentration COD organic waste water, and in order to promote treatment efficiency, sewage gets into second section oxygen deficiency pond through first section sedimentation tank, can hydrolyze the macromolecule COD that produces in the anterior segment processing, also can decompose COD effectively, reduces COD's content, also can get rid of the nitrogen in the digestive juice in the second section aeration tank through denitrification.
According to the phosphorus removal principle, phosphorus which cannot be precipitated in the first-stage sedimentation tank enters the second-stage anoxic tank along with dissolved phosphorus in water for phosphorus release reaction, so that the nutrient proportion of the water can be kept at C: N: P: 100:5:1, the nutrient activity of strains is ensured, and the second-stage anoxic tank adopts digestive juice and sludge reflux rotational flow water distribution, so that the sludge in the second-stage anoxic tank can be always in a suspension state, the strains can be fully contacted with the components in the water, and a complete mixing state is achieved.
④ the sewage flows through the second section of anoxic tank into the second section of aeration tank, and the COD is further removed, the digestion reaction and the phosphorus absorption are further carried out in the second section of aeration tank, so that the sewage is further purified.
The second section of aeration tank is a terminal oxidation reaction of sewage treatment, and the contents of ammonia nitrogen, phosphorus, total nitrogen, total phosphorus and large-chain organic molecules in the high-concentration COD organic wastewater can be reduced to a low level through the first section of anaerobic reactor → the second section of anaerobic reactor → the first section of aeration tank → the first section of sedimentation tank → the second section of anoxic tank, but the discharge requirement is not met.
If the reflux of the digestion liquid in the second section of aeration tank exceeds the standard, a set of reflux equipment is added and the digestion liquid is refluxed to the first section of anaerobic reactor for further treatment. The addition method of the reflow equipment can be as follows: and connecting a digestive juice return pipe in the second section of aeration tank with a digestive juice return pipeline in the first section of aeration tank, allowing part of the digestive juice return pipe to enter the second anoxic tank, allowing part of the digestive juice return pipe to enter the first section of anaerobic reaction tank for overrunning return, and monitoring in real time.
⑤ the sewage in the second section aeration tank automatically flows into the second section sedimentation tank for mud-water separation, the first section aeration tank and the second section aeration tank absorb phosphorus in sludge through the phosphorus absorption of phosphoric acid bacteria, and the phosphorus is discharged through two sections of sludge discharge.
⑥ the residual flows of the first stage sedimentation tank and the second stage sedimentation tank are discharged to a sludge concentration tank to treat the residual sludge.
According to the sludge backflow, the sludge subjected to sludge-water separation in the sedimentation tank is used as two parts, one part is used for supplementing the sludge in the previous second-stage anoxic tank, the first-stage aeration tank and the second-stage aeration tank, and the precipitated sludge contains a large amount of active strains, so that the sludge backflow can supplement the number of the strains continuously lost backwards in the second-stage anoxic tank, the first-stage aeration tank and the second-stage aeration tank, and the concentration of the sludge and the activity of the strains are ensured.
Because the sludge concentration in the anoxic tank and the aeration tank needs to be kept at 3000-6000mg/L (which can reach about 8000mg/L according to the water quality requirement), if the sludge concentration in the second-stage anoxic tank, the first-stage aeration tank and the second-stage aeration tank is too high, the sludge age is easy to be too long, and the sludge activity is reduced, the sludge needs to be continuously discharged, namely the other part of sludge is residual sludge, the second-stage sedimentation tank needs to continuously reflux and continuously discharge the sludge, so that the second-stage anoxic tank, the first-stage aeration tank and the second-stage aeration tank continuously generate new sludge, new strains are generated, the sludge age in the second-stage anoxic tank, the first-stage aeration tank, the second-stage aeration tank and the second-stage sedimentation tank is shortened, the activity of the strains is improved, and the high-efficiency removal efficiency in the anoxic tank and the aeration tank is ensured.
(4) Sludge backflow: second-stage sedimentation tank → second-stage aeration tank;
because a sludge return pipe is arranged between the second-stage anaerobic reactor and the first-stage sedimentation tank and is communicated with the upper part of the anaerobic closed cyclone water distributor, the sludge precipitated in the first-stage sedimentation tank can enter the second-stage anaerobic reactor through the cyclone of the sludge return pipe. According to the sludge concentration requirement of anaerobic reaction, the second section of anaerobic reactor forms the dead sludge area very easily, and the sludge blanket is seriously influenced, in order to promote the sludge activity in the second section of anaerobic reactor and the stability of sludge blanket, the mud that will deposit the first section of sedimentation tank is through flowing back to second section anaerobic reaction system, adopts the whirl to intake and makes the mud and the sewage of second section anaerobic reaction can the intensive mixing form stable mud to can further realize the effect of denitrogenation.
(5) Refluxing digestion liquid: the first section of aeration tank → the first section of anaerobic reactor → the second section of anaerobic reactor;
because a digestive juice backflow pipe is arranged between the top of the first-stage anaerobic reactor and the first-stage aeration tank and is communicated with the upper part of the anaerobic closed rotational flow water distribution device, the digestive juice generated by the first-stage aeration tank flows back to the first-stage anaerobic reactor through the digestive juice backflow pipe to carry out first-stage denitrification, and then enters the second-stage anaerobic reactor to further carry out denitrification and denitrification treatment.
Drawings
FIG. 1 is a top view of an embodiment of the present invention;
fig. 2 is a front view of an embodiment of the present invention.
Reference numerals in the drawings of the specification include: the anaerobic closed cyclone water distribution device comprises a water inlet pipeline 1, an anaerobic closed cyclone water distribution device 2, a branch pipe 3, a second-section anaerobic reactor 4, a mud guard 5, a sludge backflow pipe 6, a digestive juice backflow pipe 7, a digestive juice backflow pump 8, a microporous aeration disc structure 9, an aeration branch pipe 10, a first-section sedimentation tank water inlet pipeline 12, a first-section sedimentation tank sludge backflow pump 15, a second-section aeration tank digestive juice backflow pipe 16, a second-section digestive juice backflow pump 17, a second-section sedimentation tank water inlet pipe 19, a first-section sedimentation tank guide cylinder 20, a second-section sedimentation tank guide cylinder 21, a second-section sedimentation tank sludge backflow pipeline 22, a second-section anoxic tank closed cyclone water distribution device 23, a second-section sedimentation tank sludge backflow pump 24, a water outlet 26, a second-section sedimentation tank sludge backflow overtaking pipe 28 and a second-section aeration tank digestive juice.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment is basically as shown in the attached figures 1 and 2: the embodiment discloses a high concentration organic waste water and intelligent processing system of nitrogen and phosphorus removal, is equipped with first section anaerobic reactor, second section anaerobic reactor 4, first section aeration tank, first section sedimentation tank, second section oxygen deficiency pond, second section aeration tank and second section sedimentation tank from left to right in proper order.
The first section anaerobic reactor is sleeved outside the second section anaerobic reactor 4, and the first section anaerobic reactor and the second section anaerobic reactor 4 are separated by a wall. The anaerobic closed rotational flow water distribution device 2 which is vertically arranged is fixedly connected in the second section anaerobic reactor 4 through bolts.
A mudguard 5 is fixedly connected between the first section anaerobic reactor and the second section anaerobic reactor 4 through bolts. After the first-stage anaerobic reactor and the second-stage anaerobic reactor 4 pass through high-concentration sewage, anaerobic sludge is generated in the first-stage anaerobic reactor and the second-stage anaerobic reactor 4. Because the effect of water distribution and stirring in first section anaerobic reactor and the second section anaerobic reactor 4, can not satisfy the relative even to inside anaerobic sludge stirring, because anaerobic sludge self carries a large amount of anaerobic zymophyte, cause the inside marsh gas that produces of mud, the buoyancy of marsh gas come-up, can bring the mud out of the water surface, in order to prevent to be brought out of the water surface mud inflow next treatment process, design fender 5 blocks the outflow of mud, also can guarantee the sludge concentration in first section anaerobic reactor and the second section anaerobic reactor 4.
The intelligent treatment system also comprises a water inlet pipeline 1. The water inlet pipeline 1 is communicated with the upper part of the anaerobic closed type rotational flow water distribution device 2, the anaerobic closed type rotational flow water distribution device 2 comprises a branch pipe 3, one end of the branch pipe 3 is connected with the lower part of the anaerobic closed type rotational flow water distribution device 2, and the other end of the branch pipe 3 passes through the wall between the first section anaerobic reactor and the second section anaerobic reactor 4 and faces to one corner of the second section anaerobic reactor 4. The number of the branch pipes 3 is four, and the four branch pipes 3 respectively face four corners of the second section anaerobic reactor 4.
Microporous aeration disc structures 9 are arranged in a row on the first section of aeration tank, and the microporous aeration disc structures 9 are connected through aeration branch pipes 10.
A digestive juice reflux pipe 7 is arranged between the top of the first-stage anaerobic reactor and the first-stage aeration tank, the digestive juice reflux pipe 7 is communicated with the upper part of the anaerobic closed rotational flow water distribution device 2, and a digestive juice reflux pump 8 is fixedly connected to the digestive juice reflux pipe 7 through bolts.
A first section of sedimentation tank water inlet pipeline 12 is arranged between the first section of aeration tank and the first section of sedimentation tank, and a first section of sedimentation tank draft tube 20 and a water outlet triangular weir notch are arranged on the first section of sedimentation tank.
A sludge return pipe 6 is arranged between the second-stage anaerobic reactor 4 and the first-stage sedimentation tank, and the sludge return pipe 6 is communicated with the upper part of the anaerobic closed type rotational flow water distribution device 2. The sludge return pipe 6 is fixedly connected with a sludge return pump 15 of the first section of the sedimentation tank through bolts.
A second-section anoxic tank closed type rotational flow water distribution device 23 and a branch pipe 3 are arranged between the first-section sedimentation tank and the second-section anoxic tank.
A second section of aeration tank digestive juice reflux pipe 16 and a second section of digestive juice reflux pump 17 are arranged between the second section of aeration tank and the second section of anoxic tank.
A sludge reflux pump 24 and a sludge reflux pipe 6 are arranged between the second-stage sedimentation tank and the second-stage anaerobic reactor 4. A second section sedimentation tank guide cylinder 21 is arranged on the second section sedimentation tank.
The system adopts an activated sludge method for treating sewage, forms larger bacterial clusters, namely sludge under the condition that strains can be fully activated by aeration of an aeration tank, has extremely high settling speed and can achieve sludge-water stratification within a few minutes. The first section sedimentation tank guide cylinder 20 and the second section sedimentation tank guide cylinder 21 play a role, water in the aeration tank enters the first section sedimentation tank guide cylinder 20 and the second section sedimentation tank guide cylinder 21 on the premise of containing a large amount of activated sludge, under the action of the first section sedimentation tank guide cylinder 20 and the second section sedimentation tank guide cylinder 21, water flow is stabilized, the flow velocity of water flow is controlled, sewage is enabled to act in the first section sedimentation tank guide cylinder 20 and the second section sedimentation tank guide cylinder 21, sedimentation is orderly carried out, sludge sinks to the bottom at a constant speed, water rises to the top, and the state of sludge-water separation is achieved.
The embodiment also comprises a second section sedimentation tank sludge return surpassing pipe 28 and a second section aeration tank digestive juice return surpassing pipe 29. The second section sedimentation tank sludge return pipe 28 is mainly used for preventing the first section anaerobic reactor from high water inlet concentration, the sludge in the first section anaerobic reactor from being largely lost, the strain content is low, and the high-difficulty organic wastewater in the wastewater is difficult to treat. The second section aeration tank digestive juice flows back and surpasses pipe 29 and mainly prevents that the content of ammonia nitrogen in the second section aeration tank effluent exceeds standard, and the backward flow surpasses and gets into first section anaerobic reactor and further carries out denitration treatment, guarantees sewage treatment high ammonia nitrogen treatment effect, can guarantee the processing to reach standard of ammonia nitrogen and total nitrogen.
The invention also discloses a treatment method of the high-concentration organic wastewater and nitrogen and phosphorus removal intelligent treatment system, which comprises the following steps:
s1, first stage anaerobic reactor → second stage anaerobic reactor 4: the sewage is lifted to the upper part of the anaerobic closed rotational flow water distribution device 2 from the regulating tank by the lift pump, enters the first section of anaerobic reactor through a branch pipe 3 at the bottom of the anaerobic closed rotational flow water distribution device 2, overflows from the first section of anaerobic reactor, enters the top of the second section of anaerobic reactor 4, and then is discharged from the bottom of the second section of anaerobic reactor 4.
In the step, sewage is introduced into the anaerobic closed type rotational flow water distribution device 2 from the upper part and is sprayed to the side wall (or four corners) of the second section of anaerobic reactor 4 from the branch pipe 3 at the lower part of the anaerobic closed type rotational flow water distribution device 2, so that the stirring effect can be achieved, and the sewage can be subjected to anaerobic primary treatment to achieve the hydrolysis effect.
S2, leading the sewage obtained in the step S1 into a first-stage aeration tank through a pipeline, and controlling the dissolved oxygen content in the first-stage aeration tank to be 2-5 mg/L.
The first stage aeration tank fully aerates the sewage through a microporous aeration disc structure 9 and aeration branch pipes 10.
In addition, this example also performed a reflux of the digestion solution: the first section aeration tank → the first section anaerobic reactor → the second section anaerobic reactor 4;
because a digestive juice reflux pipe 7 is arranged between the top of the first-stage anaerobic reactor and the first-stage aeration tank, and the digestive juice reflux pipe 7 is communicated with the upper part of the anaerobic closed rotational flow water distribution device 2, the digestive juice produced by the first-stage aeration tank can reflux into the first-stage anaerobic reactor through the digestive juice reflux pipe 7 to carry out first-stage denitrification, and then enters the second-stage anaerobic reactor 4 to further carry out denitrification treatment.
And S3, leading the sewage obtained in the step S2 into a first-stage sedimentation tank through a first-stage sedimentation tank water inlet pipeline 12 for sludge-water separation.
And (3) returning the sludge precipitated in the first-stage sedimentation tank to the second-stage anaerobic reactor 4 through a sludge return pipe 6 and a first-stage sedimentation tank sludge return pump 15, and fully mixing the sludge in the second-stage anaerobic reactor 4 with the sewage by adopting rotational flow water inflow.
And S4, introducing the sewage obtained in the S3 into a second-stage anoxic tank through a second-stage anoxic tank closed cyclone water distribution device 23 and a branch pipe 3, performing phosphorus release reaction to ensure that the nutrition ratio in the sewage is kept at C: N: P: 100:5:1, and ensuring the nutrition activity of strains, wherein the second-stage anoxic tank adopts digestive juice and sludge reflux cyclone water distribution to ensure that the sludge in the second-stage anoxic tank can be always in a suspended state, so that the strains can be fully contacted with the components in the water to achieve a complete mixed state.
And S5, introducing the sewage obtained in the step S4 into a second-stage aeration tank, and fully aerating the sewage through the microporous aeration disc structure 9 and the aeration branch pipe 10.
The digestive juice flows back to the closed cyclone water distribution device 23 of the second-stage anoxic tank through a digestive juice return pipe 16 of the second-stage aeration tank and a digestive juice return pump 17 of the second-stage.
The sewage flowing through the second section of anoxic tank automatically flows into the second section of aeration tank, and COD is further removed, digestion reaction and phosphorus absorption are further carried out in the second section of aeration tank, so that the sewage is further purified.
The second section of aeration tank is a terminal oxidation reaction of sewage treatment, and ammonia nitrogen, phosphorus, total nitrogen, total phosphorus and large-chain organic molecules in the high-concentration COD organic wastewater can be reduced to a low content through the first section of anaerobic reactor → the second section of anaerobic reactor 4 → the first section of aeration tank → the first section of sedimentation tank → the second section of anoxic tank, but the discharge requirement is not met.
If the reflux of the digestion liquid in the second section of aeration tank exceeds the standard, a set of reflux equipment is added and the digestion liquid is refluxed to the first section of anaerobic reactor for further treatment.
The first section aeration tank and the second section aeration tank absorb phosphorus in sludge through phosphorus absorption of phosphoric acid bacteria, and discharge the phosphorus through two sections of sludge discharge.
And S6, enabling the sewage obtained in the step S5 to automatically flow into a second-stage sedimentation tank through a second-stage sedimentation tank water inlet pipe 19 for sludge-water separation.
And (3) making the sludge precipitated in the first-stage sedimentation tank enter the second-stage anaerobic reactor 4 in a rotational flow manner through a second sedimentation tank sludge return pipeline 22, a second-stage sedimentation tank sludge return pump 24 and a sludge return pipe 6.
According to the sludge concentration requirement of anaerobic reaction, the second section of anaerobic reactor 4 forms the dead mud district very easily, and the sludge blanket is seriously influenced, in order to promote the sludge activity in the second section of anaerobic reactor 4 and the stability of sludge blanket, through flowing back to second section anaerobic reaction system with the mud of first section sedimentation tank deposit, adopt the whirl to intake and make the mud and the sewage of second section anaerobic reaction can the intensive mixing form stable mud to can further realize the effect of denitrogenation.
The treated sewage is discharged from the water outlet 26.
In addition, residual flow sludge in the first section sedimentation tank and the second section sedimentation tank is discharged to a sludge concentration tank, and the residual sludge is treated.
According to the sludge backflow, the sludge subjected to sludge-water separation in the sedimentation tank is used as two parts, one part is used for supplementing the sludge in the previous second-stage anoxic tank and the previous aerobic tank, and the precipitated sludge contains a large amount of active strains, so that the sludge backflow can supplement the number of the strains continuously lost backwards in the second-stage anoxic tank, the first-stage aeration tank and the second-stage aeration tank, and the concentration of the sludge and the activity of the strains are ensured.
Because the sludge concentration in the anoxic tank and the aeration tank needs to be kept at 3000-6000mg/L (which can reach about 8000mg/L according to the water quality requirement), if the sludge concentration in the second-stage anoxic tank, the first-stage aeration tank and the second-stage aeration tank is too high, the sludge age is easy to be too long, and the sludge activity is reduced, the sludge needs to be continuously discharged, namely the other part of sludge is residual sludge, the second-stage sedimentation tank needs to continuously reflux and continuously discharge the sludge, so that the second-stage anoxic tank, the first-stage aeration tank and the second-stage aeration tank continuously generate new sludge, new strains are generated, the sludge age in the second-stage anoxic tank, the first-stage aeration tank, the second-stage aeration tank and the second-stage sedimentation tank is shortened, the activity of the strains is improved, and the high-efficiency removal efficiency in the anoxic tank and the aeration tank is ensured.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. An intelligent treatment system for high-concentration organic wastewater and nitrogen and phosphorus removal is characterized by comprising a first section of anaerobic reactor and a second section of anaerobic reactor (4), wherein the first section of anaerobic reactor is sleeved outside the second section of anaerobic reactor (4), and the first section of anaerobic reactor and the second section of anaerobic reactor (4) are separated by a vessel wall;
an anaerobic closed type rotational flow water distribution device (2) which is vertically arranged is arranged in the second section of anaerobic reactor (4), and the anaerobic closed type rotational flow water distribution device (2) comprises branch pipes (3);
the anaerobic closed cyclone water distribution device is characterized by further comprising a water inlet pipeline (1), wherein the water inlet pipeline (1) is communicated with the upper portion of the anaerobic closed cyclone water distribution device (2), one end of a branch pipe (3) is connected to the lower portion of the anaerobic closed cyclone water distribution device (2), and the other end of the branch pipe (3) penetrates through the wall between the first section of anaerobic reactor and the second section of anaerobic reactor (4) and faces the wall of the second section of anaerobic reactor (4).
2. The intelligent high-concentration organic wastewater and nitrogen and phosphorus removal treatment system as claimed in claim 1, wherein the number of the branch pipes (3) is four, and the four branch pipes (3) are respectively towards four corners of the second section of anaerobic reactor (4).
3. The intelligent high-concentration organic wastewater and nitrogen and phosphorus removal treatment system according to claim 1, further comprising a first section aeration tank, a first section sedimentation tank, a second section anoxic tank, a second section aeration tank and a second section sedimentation tank in sequence, wherein a sludge return pipe 6 is arranged between the second section anaerobic reactor (4) and the first section sedimentation tank, and the sludge return pipe 6 is communicated with the upper part of the anaerobic closed type rotational flow oxygen closed type rotational flow water distribution device (2).
4. The intelligent high-concentration organic wastewater and nitrogen and phosphorus removal treatment system as claimed in claim 3, wherein a digestion liquid return pipe (7) is arranged between the top of the first stage anaerobic reactor and the first stage aeration tank, and the digestion liquid return pipe (7) is communicated with the upper part of the anaerobic closed type rotational flow water distribution device (2).
5. The treatment method of the high concentration organic wastewater and the intelligent treatment system for nitrogen and phosphorus removal as claimed in claim 4, comprising the following steps:
s1, first stage anaerobic reactor → second stage anaerobic reactor (4): introducing sewage into the upper part of an anaerobic closed type rotational flow water distribution device (2), entering a first section of anaerobic reactor through a branch pipe (3) at the bottom of the anaerobic closed type rotational flow water distribution device (2), then overflowing from the first section of anaerobic reactor, entering the top of a second section of anaerobic reactor (4), and then discharging water from the bottom of the second section of anaerobic reactor (4);
s2, introducing the sewage obtained in the step S1 into a first-stage aeration tank, and controlling the dissolved oxygen content in the first-stage aeration tank to be 2-5 mg/L; the digestion liquid in the first-stage aeration tank flows back to the first-stage anaerobic reactor for first-stage denitrification, and then enters the second-stage anaerobic reactor (4) for denitrification and denitrification treatment;
s3, introducing the sewage obtained in the step S2 into a first-stage sedimentation tank for sludge-water separation; returning the sludge precipitated in the first-stage sedimentation tank to the second-stage anaerobic reactor (4), and fully mixing the sludge in the second-stage anaerobic reactor (4) with sewage by adopting rotational flow water inflow;
s4, introducing the sewage obtained in the step S3 into a second-stage anoxic tank, and performing phosphorus release reaction to ensure that the nutrition ratio in the sewage is kept at C: N: P: 100:5: 1;
s5, introducing the sewage obtained in the step S4 into a second section of aeration tank;
s6, introducing the sewage obtained in the step S5 into a second-stage sedimentation tank for sludge-water separation; the sludge precipitated in the first section of sedimentation tank enters a second section of anaerobic reactor (4) through the rotational flow of a sludge return pipe.
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