CN113443793A - Device and process for treating organic wastewater by combining pure oxygen strong oxidation contact and deep well A/A/O aeration - Google Patents
Device and process for treating organic wastewater by combining pure oxygen strong oxidation contact and deep well A/A/O aeration Download PDFInfo
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- CN113443793A CN113443793A CN202110902661.3A CN202110902661A CN113443793A CN 113443793 A CN113443793 A CN 113443793A CN 202110902661 A CN202110902661 A CN 202110902661A CN 113443793 A CN113443793 A CN 113443793A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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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
- C02F3/02—Aerobic 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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
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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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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Abstract
The invention belongs to the field of organic wastewater treatment, and discloses a device and a process for treating organic wastewater by combining pure oxygen strong oxidation contact and deep well A/A/O aeration. A pure oxygen strong oxidation contact tank and a deep well A/A/O aeration tank; the pure oxygen strong oxidation contact tank is an integrated reaction tank comprising an aeration tank part and a precipitation part; the deep well A/A/O aeration tank is divided into three grids by a partition plate, a first anaerobic part, a second anaerobic part and an aerobic part. Organic wastewater enters a pure oxygen strong oxidation contact tank, is subjected to partial pure oxygen aeration and sedimentation separation in a sedimentation tank in a sealed aeration tank in sequence, easily biodegradable organic matters in the wastewater are fully degraded firstly through the pure oxygen enhanced aeration, and partial difficultly biodegradable organic matters are removed through biological sludge adsorption; the residual organic matters which are difficult to biodegrade enter a deep well A/A/O aeration tank, the organic matters are primarily degraded into small molecules by anaerobic-anoxic, the biodegradability of the wastewater is improved, and then the organic matters enter an aerobic part for pure oxygen aeration to form aerobic activated sludge.
Description
Technical Field
The invention belongs to the field of organic wastewater treatment, and relates to a device and a process for treating organic wastewater by combining pure oxygen strong oxidation contact and deep well A/A/O aeration.
Background
The waste water and waste liquid produced in the industrial production process contain industrial production materials, intermediate products, byproducts which are lost along with water, and pollutants produced in the production process, and have various types and complex components. Among them, organic components of organic wastewater are very complex and the treatment difficulty is the greatest, which has become an industry pain point.
At present, the bentonite is adopted to treat the organic wastewater, but the effect is poor. There are also decomposition by biochemical action of microorganisms, which require the consumption of oxygen during their decomposition, and are therefore called oxygen-consuming pollutants. Such contaminants can cause a reduction in dissolved oxygen in the water, affecting the growth of fish and other aquatic organisms. After the dissolved oxygen in water is exhausted, organic matters are subjected to anaerobic decomposition to generate unpleasant odors such as hydrogen sulfide, ammonia, mercaptan and the like, so that the water quality is deteriorated, and the normal life of residents nearby the water body is greatly influenced. In general, after pretreatment, the sewage needs to be treated by anaerobic and aerobic treatment or anoxic and aerobic treatment. By adopting the combined biological treatment process of 'anoxic and aerobic', under the condition of nitrifying liquid backflow, although the denitrification effect can be realized and the B/C ratio of the wastewater can be improved, the COD (chemical oxygen demand) reduction after the wastewater pretreatment is limited, the aerobic tank is inevitably required to have enough volume to degrade the residual COD and BOD. Obviously, the combined biological treatment process of the anoxic and aerobic processes is not economical, and the organic matters easy to biodegrade and the organic matters difficult to biodegrade are treated together, so that the organic matters difficult to biodegrade are often not thoroughly treated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a device for treating organic wastewater by combining pure oxygen strong oxidation contact and deep well A/A/O aeration, which realizes progressive high-efficiency treatment from easy to difficult, has more thorough treatment and can effectively save resources in the treatment process.
The present invention achieves the above-described object by the following technical means.
A device for treating organic wastewater by combining pure oxygen strong oxidation contact and deep well A/A/O aeration sequentially comprises a pure oxygen strong oxidation contact tank and a deep well A/A/O aeration tank; wherein the pure oxygen strong oxidation contact tank is an integrated reaction tank comprising an aeration tank part and a precipitation part, wherein the aeration part accounts for 3/4 of the total volume, and the precipitation part accounts for 1/4 of the total volume; the deep well A/A/O aeration tank is divided into three grids by a first clapboard and a second clapboard, wherein the three grids are a first anaerobic part, a second anaerobic part and an aerobic part respectively, and each part accounts for 40%, 10% and 50% of the total volume of the aeration tank respectively. Wherein the concentration of dissolved oxygen in the second anaerobic part is lower than 0.5 mg/L; the concentration of dissolved oxygen in the aerobic section is in the range of 5 to 8 mg/L.
Wherein the distance between the first clapboard between the first anaerobic part and the second anaerobic part and the bottom of the aeration tank is x, the distance between the second anaerobic part and the aerobic part and the bottom of the aeration tank is y, and x is more than y;
further, x-y is 0.5-1 m;
further, x is 1.5 to 2m, and y is 1 m.
An air separation device is arranged between the pure oxygen strong oxidation contact tank and the deep well A/A/O aeration tank, air is separated into nitrogen and oxygen through the air separation device, and the nitrogen is conveyed to the first anaerobic part for aeration to play roles of stirring, mixing and plug flow; the second anaerobic part mainly releases nitrogen; oxygen is delivered to the pure oxygen strong oxidation contact tank and the aerobic part.
The aeration tank of the pure oxygen strong oxidation contact tank is partially sealed and is internally filled with fiber bundles; the filling rate of the fiber bundle is 2/3-4/5 of the volume of the aeration tank.
The sedimentation part of the pure oxygen strong oxidation contact tank is opened to release redundant oxygen and filled with an inclined plate or an inclined pipe, so that the pure oxygen strong oxidation contact tank has the integrated functions of pure oxygen aeration and sedimentation separation, and the inclination angle of the inclined plate or the inclined pipe in the pure oxygen strong oxidation contact tank is 30-60 degrees.
The device also comprises a digestive juice reflux system and a sludge reflux system.
The bottom of the pure oxygen strong oxidation contact tank is also provided with a sludge hopper.
The process for treating the organic wastewater by using the device comprises the following steps:
organic wastewater enters a pure oxygen strong oxidation contact tank, is subjected to partial pure oxygen aeration and sedimentation separation in a sedimentation tank in a sealed aeration tank in sequence, easily biodegradable organic matters in the wastewater are fully degraded firstly through the pure oxygen enhanced aeration, and partial difficultly biodegradable organic matters are removed through biological sludge adsorption; the residual organic matters which are difficult to biodegrade enter a first anaerobic part and a second anaerobic part of an A/A/O aeration tank of the deep well, the organic matters are preliminarily degraded into small molecules by anaerobic-anoxic reaction, the biodegradability of the wastewater is improved, and then the organic matters enter an aerobic part to be fully degraded by pure oxygen to form aerobic activated sludge after pure oxygen aeration.
The method comprises the following specific steps:
(1) starting the air separation equipment, separating air into nitrogen and oxygen through the air separation equipment, conveying the nitrogen to the first anaerobic part for aeration, and mainly releasing the nitrogen in the second anaerobic part; oxygen is delivered to a pure oxygen strong oxidation contact tank and an aerobic part;
(2) organic wastewater enters a pure oxygen strong oxidation contact tank, is subjected to partial pure oxygen aeration and sedimentation separation in a sedimentation tank in a sealed aeration tank in sequence, easily biodegradable organic matters such as alcohols, organic acids, fats and proteins in the wastewater are fully degraded through the pure oxygen enhanced aeration, and partial difficultly biodegradable organic matters such as saturated hydrocarbons and benzene-containing rings are removed through biological sludge adsorption;
(3) the remaining organic matters which are difficult to biodegrade after the treatment of the step (2) enter a first anaerobic part and a second anaerobic part of an A/A/O aeration tank of the deep well, the organic matters which are difficult to biodegrade are firstly subjected to anaerobic-anoxic breaking or ring opening to be primarily degraded into micromolecular organic matters, then the organic matters enter an aerobic part to be fully degraded by pure oxygen, and finally aerobic activated sludge is formed;
(4) returning the digestive juice obtained by the treatment in the step (3) to the deep well A/A/O aeration tank for continuous treatment through a digestive juice reflux system; the sludge is treated by a sludge return system.
The invention has the beneficial effects that:
(1) the pure oxygen strong oxidation contact tank is a reaction tank integrating an aeration tank and a sedimentation tank, and has the integrated functions of pure oxygen aeration and sedimentation separation.
(2) The deep well A/A/O aeration method of the invention is used in a deep well, and has the functions of degrading organic matters, removing nitrogen and phosphorus; the length of the first partition plate and the second partition plate is set, so that the second anaerobic part can be guaranteed to better release nitrogen.
(3) According to the invention, organic wastewater is treated by using a combination of pure oxygen strong oxidation contact and deep well A/A/O aeration, firstly, the pure oxygen strong aeration in a pure oxygen strong oxidation contact tank is used for sufficiently degrading easily biodegradable organic matters in the wastewater, part of difficultly biodegradable organic matters are removed through biological sludge adsorption, and the rest difficultly biodegradable organic matters enter a deep well A/A/O aeration tank to be subjected to anaerobic-anoxic treatment to primarily degrade the organic matters into small molecules, so that the biodegradability of the wastewater is improved, and then, the pure oxygen is used for sufficiently degrading in an aerobic manner to form aerobic activated sludge; the treatment effect is better by the progressive treatment layer by layer.
Drawings
FIG. 1 is a schematic diagram of a device for treating organic wastewater by combining pure oxygen strong oxidation contact and deep well A/A/O aeration according to the invention.
The reference numerals are explained below:
1-a pure oxygen strong oxidation contact tank, 2-an aeration tank part, 3-a precipitation part, 4-a deep well A/A/O aeration tank and 5-air separation equipment; 6-first partition, 7-second partition.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
As shown in figure 1, the device for treating organic wastewater by combining pure oxygen strong oxidation contact and deep well A/A/O aeration sequentially comprises a pure oxygen strong oxidation contact tank and a deep well A/A/O aeration tank; wherein the pure oxygen strong oxidation contact tank is an integrated reaction tank comprising an aeration tank part and a precipitation part; the aeration tank is partially sealed, fiber bundles are filled in the aeration tank, and the filling rate of the fiber bundles is 2/3-4/5 of the volume of the aeration tank; the settling part of the pure oxygen strong oxidation contact tank is opened to release redundant oxygen and is filled with an inclined plate or an inclined pipe; the inclination angle of the inclined plate or the inclined pipe is 30-60 degrees; the bottom of the pure oxygen strong oxidation contact tank is provided with a sludge hopper.
The deep well A/A/O aeration tank is divided into three lattices by a first clapboard 6 and a second clapboard 7, the first lattice is a first anaerobic part, the second lattice is a second anaerobic part, and the third lattice is an aerobic part. The first partition plate is 1.5-2 m away from the bottom of the tank, and the second partition plate is 1m away from the bottom of the tank. The shorter first partition is mainly to better release nitrogen for the second anaerobic part. An air separation device is arranged between the pure oxygen strong oxidation contact tank and the deep well A/A/O aeration tank, air is separated into nitrogen and oxygen through the air separation device, and the nitrogen is conveyed to the first anaerobic part for aeration to play roles of stirring, mixing and plug flow; the second anaerobic part mainly releases nitrogen, and the concentration of dissolved oxygen is lower than 0.5 mg/L; oxygen is conveyed to a pure oxygen strong oxidation contact tank and an aerobic part, and the concentration range of dissolved oxygen in the aerobic part is 5-8 mg/L.
The device is also provided with a digestive juice reflux system and a sludge reflux system.
The process for treating the organic wastewater by using the device comprises the following steps:
(1) starting the air separation equipment, separating air into nitrogen and oxygen through the air separation equipment, conveying the nitrogen to the first anaerobic part for aeration, and mainly releasing the nitrogen in the second anaerobic part; oxygen is delivered to a pure oxygen strong oxidation contact tank and an aerobic part;
(2) organic wastewater enters a pure oxygen strong oxidation contact tank, is subjected to partial pure oxygen aeration and sedimentation separation in a sedimentation tank in a sealed aeration tank in sequence, easily biodegradable organic matters such as alcohols, organic acids, fats and proteins in the wastewater are fully degraded through the pure oxygen enhanced aeration, and partial difficultly biodegradable organic matters such as saturated hydrocarbons and benzene-containing rings are removed through biological sludge adsorption;
(3) the remaining organic matters which are difficult to biodegrade after the treatment of the step (2) enter a first anaerobic part and a second anaerobic part of an A/A/O aeration tank of the deep well, the organic matters which are difficult to biodegrade are firstly subjected to anaerobic-anoxic breaking or ring opening to be primarily degraded into micromolecular organic matters, then the organic matters enter an aerobic part to be fully degraded by pure oxygen, and finally aerobic activated sludge is formed;
(4) returning the digestive juice obtained by the treatment in the step (3) to the deep well A/A/O aeration tank for continuous treatment through a digestive juice reflux system; the sludge is treated by a sludge return system.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (10)
1. The device for treating organic wastewater by combining pure oxygen strong oxidation contact and deep well A/A/O aeration is characterized by sequentially comprising a pure oxygen strong oxidation contact tank and a deep well A/A/O aeration tank; wherein the pure oxygen strong oxidation contact tank is an integrated reaction tank comprising an aeration tank part and a precipitation part; wherein the aerated fraction accounts for total volume 3/4 and the sediment fraction accounts for total volume 1/4; the deep well A/A/O aeration tank is divided into three grids by a first clapboard and a second clapboard, and the three grids are a first anaerobic part, a second anaerobic part and an aerobic part respectively.
2. The apparatus of claim 1, wherein the first anaerobic part, the second anaerobic part and the aerobic part respectively account for 40%, 10% and 50% of the total volume of the aeration tank; the concentration of dissolved oxygen in the second anaerobic part is 0.5-3 mg/L; the concentration of dissolved oxygen in the aerobic section is in the range of 5 to 8 mg/L.
3. The apparatus according to claim 1, wherein the first partition between the first anaerobic section and the second anaerobic section is spaced from the bottom of the aeration tank by a distance x, the second anaerobic section and the aerobic section are spaced from the bottom of the aeration tank by a distance y, x > y, and x-y is 0.5 to 1 m.
4. The device of claim 3, wherein x is 1.5 to 2m and y is 1 m.
5. The apparatus according to claim 1, wherein an air separation device is provided between the pure oxygen strong oxidation contact tank and the deep well A/A/O aeration tank, air is separated into nitrogen and oxygen by the air separation device, and the nitrogen is supplied to the first anaerobic part for aeration; the second anaerobic part releases nitrogen; oxygen is delivered to the pure oxygen strong oxidation contact tank and the aerobic part.
6. The apparatus of claim 1, wherein the aeration tank of the pure oxygen strong oxidation contact tank is partially sealed and filled with fiber bundles at a filling rate of 2/3-4/5 of the volume of the aeration tank.
7. The apparatus of claim 1, wherein the settling section of the pure oxygen strong oxidation contact tank is open, releases excess oxygen and fills with an inclined plate or tube inclined at an angle of 30-60 °.
8. The apparatus of claim 1, wherein the bottom of the pure oxygen strong oxidation contact tank is further provided with a sludge hopper.
9. The apparatus of claim 1, further comprising a digester effluent recirculation system and a sludge recirculation system.
10. A process for treating organic wastewater using the apparatus according to any one of claims 1 to 9, comprising the steps of:
(1) starting the air separation equipment, separating air into nitrogen and oxygen through the air separation equipment, conveying the nitrogen to the first anaerobic part for aeration, and mainly releasing the nitrogen in the second anaerobic part; oxygen is delivered to a pure oxygen strong oxidation contact tank and an aerobic part;
(2) organic wastewater enters a pure oxygen strong oxidation contact tank, is subjected to partial pure oxygen aeration and sedimentation separation in a sedimentation tank in a sealed aeration tank in sequence, easily biodegradable organic matters in the wastewater are fully degraded firstly through the pure oxygen enhanced aeration, and partial difficultly biodegradable organic matters are removed through biological sludge adsorption;
the easily biodegradable organic matter is alcohols, organic acids, fats or proteins;
the organic matter difficult to be biodegraded is saturated hydrocarbon or benzene-containing ring;
(3) the organic matter which is difficult to biodegrade and is left after the treatment of the step (2) enters a first anaerobic part and a second anaerobic part of a deep well A/A/O aeration tank, the organic matter is primarily degraded into small molecules by anaerobic-anoxic, then enters an aerobic part and is fully degraded by pure oxygen, and finally aerobic activated sludge is formed;
(4) returning the digestive juice obtained by the treatment in the step (3) to the deep well A/A/O aeration tank for continuous treatment through a digestive juice reflux system; the sludge is treated by a sludge return system.
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| CN202110902661.3A CN113443793A (en) | 2021-08-06 | 2021-08-06 | Device and process for treating organic wastewater by combining pure oxygen strong oxidation contact and deep well A/A/O aeration |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2314383A1 (en) * | 2000-07-19 | 2002-01-19 | Frederic Koch | Biological process for removing phosphorus involving a membrane filter |
| CN102603066A (en) * | 2012-03-16 | 2012-07-25 | 桂林理工大学 | Deep well type A2O2 method for treating sewage and waste water |
| CN205527976U (en) * | 2016-02-04 | 2016-08-31 | 河北惠泽环境工程技术有限公司 | Multistage AO short distance denitrogenation oxygen boosting aeration tank |
| CN207943922U (en) * | 2017-12-18 | 2018-10-09 | 桑德生态科技有限公司 | The sewage disposal system of energy regenerating is realized based on AB techniques |
| CN208916903U (en) * | 2018-09-04 | 2019-05-31 | 湖北满枉环保科技有限公司 | A kind of SBR sewage-treatment plant |
| CN109912029A (en) * | 2019-03-19 | 2019-06-21 | 北京工业大学 | A kind of gravity flow Internal-circulationaerobic aerobic granule sludge continuous flow reactor |
-
2021
- 2021-08-06 CN CN202110902661.3A patent/CN113443793A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2314383A1 (en) * | 2000-07-19 | 2002-01-19 | Frederic Koch | Biological process for removing phosphorus involving a membrane filter |
| CN102603066A (en) * | 2012-03-16 | 2012-07-25 | 桂林理工大学 | Deep well type A2O2 method for treating sewage and waste water |
| CN205527976U (en) * | 2016-02-04 | 2016-08-31 | 河北惠泽环境工程技术有限公司 | Multistage AO short distance denitrogenation oxygen boosting aeration tank |
| CN207943922U (en) * | 2017-12-18 | 2018-10-09 | 桑德生态科技有限公司 | The sewage disposal system of energy regenerating is realized based on AB techniques |
| CN208916903U (en) * | 2018-09-04 | 2019-05-31 | 湖北满枉环保科技有限公司 | A kind of SBR sewage-treatment plant |
| CN109912029A (en) * | 2019-03-19 | 2019-06-21 | 北京工业大学 | A kind of gravity flow Internal-circulationaerobic aerobic granule sludge continuous flow reactor |
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