CN110627294B - Sewage treatment method - Google Patents
Sewage treatment method Download PDFInfo
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- CN110627294B CN110627294B CN201810659764.XA CN201810659764A CN110627294B CN 110627294 B CN110627294 B CN 110627294B CN 201810659764 A CN201810659764 A CN 201810659764A CN 110627294 B CN110627294 B CN 110627294B
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- sewage
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- tank
- electric flocculation
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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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
- C02F1/5281—Installations for water purification using chemical agents
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides a sewage treatment method, which comprises the following steps: collecting sewage; providing a sewage treatment device, wherein the sewage treatment device comprises a high-density sedimentation tank for pretreating sewage, a biological aerated filter for purifying the sewage and an electric flocculation device for removing dissolved oxygen in returned nitrified liquid, and the high-density sedimentation tank, the biological aerated filter and the electric flocculation device are communicated in sequence; the aeration biological pond comprises a denitrification pond and a nitrification pond which are communicated with each other, the electric flocculation device is provided with a liquid inlet pipe and a liquid outlet pipe, the denitrification pond is communicated with the high-density sedimentation pond, the nitrification pond is communicated with the liquid inlet pipe, and the liquid outlet pipe is communicated with the high-density sedimentation pond; and introducing the collected sewage into the high-density sedimentation tank, performing circulating purification treatment by using the sewage treatment device, and discharging the sewage from the nitrification tank to obtain purified water. The cost of the sewage treatment method is obviously reduced.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment method.
Background
The sedimentation tank is one of main facilities for removing suspended matters in water, and after the sedimentation tank is subjected to horizontal flow type, vertical flow type and radial flow type sedimentation tanks, in recent years, novel high-density sedimentation tanks are increasingly widely applied. Iron needs to be added into the high-density sedimentation tankSalt (FeCl)3) As a flocculating agent, the method can improve the quality of the effluent of the high-density sedimentation tank. When the high-density sedimentation tank and the Biological Aerated Filter (BAF) are combined for use, the load of sewage entering the Biological Aerated Filter can be reduced, meanwhile, the return of nitrifying liquid in the Biological Aerated Filter is important, and the pollutant load in the Biological Aerated Filter can be further reduced, so that the Total Nitrogen (TN) removal effect in the Biological Aerated Filter is improved.
However, at present, Dissolved Oxygen (DO) in the return flow of the nitrified liquid of the biological aerated filter is too much (close to saturation), which consumes carbon sources in a denitrification pool and reduces the removal effect of nitrate, so that the sewage treatment effect is not ideal; therefore, the existing sewage treatment technology needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a sewage treatment method, aiming at solving the technical problem that the amount of dissolved oxygen in the nitrified liquid flowing back when a biological aerated filter is used for working is too large in the conventional sewage treatment method.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
the invention provides a sewage treatment method, which comprises the following steps:
collecting sewage; providing a sewage treatment device which comprises a high-density sedimentation tank for pretreating sewage, a biological aerated filter for purifying the sewage and an electric flocculation device for removing dissolved oxygen in returned nitrified liquid, wherein the high-density sedimentation tank, the biological aerated filter and the electric flocculation device are communicated in sequence; the aeration biological pond comprises a denitrification pond and a nitrification pond which are communicated with each other, the electric flocculation device is provided with a liquid inlet pipe and a liquid outlet pipe, the denitrification pond is communicated with the high-density sedimentation pond, the nitrification pond is communicated with the liquid inlet pipe, and the liquid outlet pipe is communicated with the high-density sedimentation pond;
and introducing the collected sewage into the high-density sedimentation tank, performing circulating purification treatment by using the sewage treatment device, and discharging the sewage from the nitrification tank to obtain purified water.
The sewage treatment method provided by the invention has the beneficial effects that compared with the prior art, the sewage treatment method is a sewage treatment method combining the electric flocculation device and the high-density sedimentation tank with the preposed BAF process, the electric flocculation device is additionally arranged between the high-density sedimentation tank and the biological aerated filter in the sewage treatment device used in the sewage treatment method, so that the nitrified liquid flowing back from the nitrifying tank in the biological aerated filter enters the high-density sedimentation tank and is subjected to oxygen removal treatment by the electric flocculation device, Fe (II) generated in situ by electric flocculation in the electric flocculation device is oxidized into Fe (III) through DO in the returned nitrified liquid, and the substances can be used as flocculating agents in the high-density sedimentation tank, namely ferric salts generated by the electric flocculation replace flocculating agents in the high-density sedimentation tank, so that the cost of adding the flocculating agents is reduced; meanwhile, after DO in the refluxed nitrified liquid is effectively removed, the cost of adding the deoxidant or adding an external carbon source into the nitrified liquid can be further reduced. Therefore, the sewage treatment method remarkably reduces the treatment cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic view of a sewage treatment apparatus according to example 1 of the present invention;
wherein, in the figures, the various reference numbers:
1-high density sedimentation tank; 11-a reaction zone; 12-a clarification zone; 121-a sewage draining outlet; 122-sludge bucket;
2-aeration biological filter; 21-a denitrification tank; 22-a nitrification tank;
3-an electric flocculation device; 31-a liquid inlet pipe; 32-liquid drain pipe;
4-nitrifying liquid reflux pump;
and 5-a water storage tank.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The embodiment of the invention provides a sewage treatment method, which comprises the following steps:
s01: collecting sewage; providing a sewage treatment device (as shown in figure 1) which comprises a high-density sedimentation tank 1 for pretreating sewage, a biological aerated filter 2 for purifying the sewage and an electric flocculation device 3 for removing dissolved oxygen in returned nitrified liquid, wherein the high-density sedimentation tank 1, the biological aerated filter 2 and the electric flocculation device 3 are communicated in a loop way; the aeration biological pond 2 comprises a denitrification pond 21 and a nitrification pond 22 which are communicated with each other, the electric flocculation device 3 is provided with a liquid inlet pipe 31 and a liquid outlet pipe 32, the denitrification pond 21 is communicated with the high-density sedimentation pond 1, the nitrification pond 22 is communicated with the liquid inlet pipe 31, and the liquid outlet pipe 32 is communicated with the high-density sedimentation pond 1;
S02: and introducing the collected sewage into the high-density sedimentation tank, performing circular purification treatment by the sewage treatment device, and discharging the sewage from the nitrification tank to obtain purified water.
According to the sewage treatment method provided by the embodiment of the invention, the electric flocculation device and the high-density sedimentation tank are combined with the preposed BAF process, the electric flocculation device is additionally arranged between the high-density sedimentation tank and the biological aerated filter in the sewage treatment device used in the sewage treatment method, so that the nitrified liquid flowing back from the nitrified tank in the biological aerated filter is subjected to oxygen removal treatment by the electric flocculation device on the way of entering the high-density sedimentation tank, Fe (II) generated in situ by electric flocculation in the electric flocculation device is oxidized into Fe (III) through DO in the returned nitrified liquid, and the substance can be used as a flocculating agent in the high-density sedimentation tank, so that the cost of adding the flocculating agent is reduced; meanwhile, after DO in the refluxed nitrified liquid is effectively removed, the cost of adding the deoxidant or the external carbon source into the nitrified liquid can be further reduced. Therefore, the sewage treatment method remarkably reduces the treatment cost.
Further, in the step S01, in the sewage treatment apparatus used in the sewage treatment method, the electric flocculation apparatus 3 is a tubular electric flocculation apparatus or a column electric flocculation apparatus. The electric flocculation device 3 generates a high-activity polymorphic polyaluminium or polyferric flocculant in situ and removes DO in the refluxed nitrified liquid; the tubular electric flocculation device or the column type electric flocculation device can achieve good oxygen removal effect, and the tubular electric flocculation device is preferred in the embodiment of the invention.
Further, in the sewage treatment apparatus in the above step S01, a nitrifying liquid reflux pump 4 is provided between the electric flocculation apparatus 3 and the nitrification tank 22. The nitrifying liquid reflux pump 4 can reflux the nitrifying liquid to the electric flocculation device 3 more effectively so as to further improve the sewage treatment efficiency.
Further, in the sewage treatment apparatus in the above step S01, the high-density sedimentation tank 1 includes a reaction zone 11 containing a flocculant and a clarification zone 12 for settling sludge, the reaction zone 11 is communicated with the liquid discharge pipe 32 of the electric flocculation apparatus 3, and the clarification zone 12 is communicated with the denitrification tank 21. The flocculating agent in the high-density sedimentation tank 1 is the floc generated by the electric flocculation device 3, and is preferably FeCl3。
Further, the above-mentioned clarification zone 12 is provided with a drain 121 for discharging the sludge. After the reaction zone 11 of the high-density sedimentation tank 1 is added with flocculant to pretreat sewage, part of sludge can be precipitated in the clarification zone 12 and is discharged through the sewage discharge outlet 121, which is more beneficial to the sewage treatment of the subsequent biological aerated filter 2.
Further, the above-mentioned clarification zone 12 is also provided with a sludge hopper 122 for increasing the retention time of the sludge. The sludge hopper 122 increases the retention time of the sludge, and can enhance the effect of producing carbon sources by hydrolyzing and acidifying the sludge, so that the high-density sedimentation tank 1 can provide carbon sources for the denitrification tank 21. The cost of the external carbon source is further saved by the sewage treatment method provided by the embodiment of the invention.
Further, in the sewage treatment apparatus in the above step S01, the sewage treatment apparatus further includes a water storage tank 5, and the water storage tank 5 is communicated with the nitrification tank 22. After the sewage is circularly treated and purified by the sewage treatment device, the sewage is discharged from the nitrification tank 22 and stored by the water storage tank 5 for later use.
The invention is described in more detail below with reference to specific examples, which are given as reference to a part of the test results.
Example 1
A sewage treatment device comprises a high-density sedimentation tank 1 for pretreating sewage, a biological aerated filter 2 for purifying the sewage and an electric flocculation device 3 for removing dissolved oxygen in returned nitrified liquid, wherein the high-density sedimentation tank 1, the biological aerated filter 2 and the electric flocculation device 3 are communicated in a loop sequence; the aeration biological pool 2 comprises a denitrification pool 21 and a nitrification pool 22 which are communicated with each other, the electric flocculation device 3 is provided with a liquid inlet pipe 31 and a liquid outlet pipe 32, the denitrification pool 21 is communicated with the high-density sedimentation pool 1, the nitrification pool 22 is communicated with the liquid inlet pipe 31, and the liquid outlet pipe 32 is communicated with the high-density sedimentation pool 1.
In addition, a nitrifying liquid reflux pump 4 is arranged between the electric flocculation device 3 and the nitrification tank 22. The high-density sedimentation tank 1 comprises a reaction zone 11 filled with a flocculating agent and a clarification zone 12 for settling sludge, wherein the reaction zone 11 is communicated with the liquid discharge pipe 32 on the electric flocculation device 3, and the clarification zone 12 is communicated with the denitrification tank 21. The sewage treatment device also comprises a water storage tank 5, and the water storage tank 5 is communicated with the nitrification tank 22.
Example 2
A sewage treatment method comprises the following steps:
s21: collecting sewage;
s22: introducing the collected sewage into a high-density sedimentation tank in the sewage treatment device in example 1, performing circulating purification treatment by the sewage treatment device, and then discharging the sewage from the nitrification tank to obtain purified water.
In the sewage treatment method of the embodiment, the electric flocculation device 3 and the high-density sedimentation tank 1+ pre-BAF process are combined for use: DO in the returned nitrified liquid entering the electric flocculation device 3 is 6-10ppm, and DO in the nitrified liquid solution treated by the electric flocculation device 3 is kept at 1-3 ppm. TN has no obvious removing effect in the electric flocculation device 3, but because of the reduction of DO, the DO entering the denitrification tank 21 is reduced, so that the TN removing rate of the denitrification tank 21 is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A sewage treatment method is characterized by comprising the following steps:
collecting sewage; providing a sewage treatment device, wherein the sewage treatment device comprises a high-density sedimentation tank for pretreating sewage, a biological aerated filter for purifying the sewage and an electric flocculation device for removing dissolved oxygen in returned nitrified liquid, and the high-density sedimentation tank, the biological aerated filter and the electric flocculation device are communicated in sequence; the biological aerated filter comprises a denitrification tank and a nitrification tank which are communicated with each other, the electric flocculation device is provided with a liquid inlet pipe and a liquid outlet pipe, the denitrification tank is communicated with the high-density sedimentation tank, the nitrification tank is communicated with the liquid inlet pipe, and the liquid outlet pipe is communicated with the high-density sedimentation tank;
the high-density sedimentation tank comprises a reaction area filled with a flocculating agent and a clarification area for settling sludge, the reaction area is communicated with the liquid discharge pipe on the electric flocculation device, the clarification area is communicated with the denitrification tank, and the flocculating agent is floc generated by the electric flocculation device;
And introducing the collected sewage into the high-density sedimentation tank, performing circulating purification treatment by using the sewage treatment device, and discharging the sewage from the nitrification tank to obtain purified water.
2. The wastewater treatment method according to claim 1, wherein the electrocoagulation device is a tubular electrocoagulation device or a column-type electrocoagulation device.
3. The sewage treatment method according to claim 1, wherein a nitrified liquid reflux pump is arranged between the electric flocculation device and the nitrifying tank.
4. The wastewater treatment method according to claim 1, wherein the clarification zone is provided with a drain for discharging the sludge.
5. The wastewater treatment process of claim 1 wherein the clarification zone is further provided with a sludge hopper for increasing the sludge retention time.
6. The wastewater treatment method according to any of claims 1 to 5, wherein the wastewater treatment apparatus further comprises a water storage tank, and the water storage tank is communicated with the nitrification tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810659764.XA CN110627294B (en) | 2018-06-25 | 2018-06-25 | Sewage treatment method |
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| CN201810659764.XA CN110627294B (en) | 2018-06-25 | 2018-06-25 | Sewage treatment method |
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| CN110627294A CN110627294A (en) | 2019-12-31 |
| CN110627294B true CN110627294B (en) | 2022-06-28 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1903744A (en) * | 2006-08-15 | 2007-01-31 | 北京工业大学 | Improved MUCT technology and device |
| CN105621792A (en) * | 2015-12-30 | 2016-06-01 | 北京河海清源环保科技有限公司 | City watercourse drain outlet sewage treatment method and device |
| CN207158980U (en) * | 2017-08-21 | 2018-03-30 | 光大水务科技发展（南京）有限公司 | Tubular type electric flocculation device |
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- 2018-06-25 CN CN201810659764.XA patent/CN110627294B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1903744A (en) * | 2006-08-15 | 2007-01-31 | 北京工业大学 | Improved MUCT technology and device |
| CN105621792A (en) * | 2015-12-30 | 2016-06-01 | 北京河海清源环保科技有限公司 | City watercourse drain outlet sewage treatment method and device |
| CN207158980U (en) * | 2017-08-21 | 2018-03-30 | 光大水务科技发展（南京）有限公司 | Tubular type electric flocculation device |
Non-Patent Citations (1)
| Title |
|---|
| "电絮凝技术在水处理中的研究进展综述";周振 等;《净水技术》;20151025;第34卷(第5期);第9-14页全部内容 * |
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