CN113087297A - Device and method for enhancing recovery of dissolved carbon source in sewage and application - Google Patents
Device and method for enhancing recovery of dissolved carbon source in sewage and application Download PDFInfo
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- CN113087297A CN113087297A CN202110373296.1A CN202110373296A CN113087297A CN 113087297 A CN113087297 A CN 113087297A CN 202110373296 A CN202110373296 A CN 202110373296A CN 113087297 A CN113087297 A CN 113087297A
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic 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
- 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
- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention belongs to the technical field of environmental protection and sewage treatment, and particularly relates to a device and a method for strengthening recovery of a dissolved carbon source in sewage and application of the device and the method. The device comprises a materialization recovery tank and a biological recovery tank; the physical and chemical recovery tank recovers granular and colloidal carbon sources in the sewage through flocculation and precipitation; a biological recovery tank, wherein the biological recovery tank recovers dissolved carbon source by utilizing the assimilation and transformation process of microorganisms; and the sewage treated by the materialized recovery tank enters a biological recovery tank to recover the dissolved carbon source. The device can effectively recover the granular carbon source and the colloidal carbon source in the sewage through the materialization recovery tank, and simultaneously, the carbon source of the effluent of the materialization recovery tank is mainly in the dissolved state, so that the pertinence of the biological recovery tank to the recovery of the dissolved carbon source is enhanced, the recovery efficiency of the dissolved carbon source is obviously improved, and the recovery rate of the carbon source is integrally improved.
Description
Technical Field
The invention belongs to the technical field of environmental protection and sewage treatment, and particularly relates to a device and a method for strengthening recovery of a dissolved carbon source in sewage and application of the device and the method.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
With the rapid growth of population and the rapid development of urbanization, the discharge amount of sewage rapidly increases, and the scale of sewage treatment facilities rapidly expands. At present, the conventional activated sludge process is commonly used for treating urban sewage, but the problems of high energy consumption, large carbon emission, poor resource recycling effect and the like exist, and the contradiction is inevitably formed with the current sustainable development concept. The sewage is an effective carrier of resources, contains a large amount of carbon sources, and is an important way for realizing sustainable development of sewage treatment by fully recovering and converting the carbon sources.
The current mainstream processes for recovering the carbon source in the sewage comprise a high-load activated sludge process, a chemical enhanced flocculation process and a membrane separation process. The high-load activated sludge process realizes enrichment and recovery of the granular colloidal carbon source in the sewage through biological flocculation adsorption, but the granular colloidal carbon source is adsorbed on the surface of the activated sludge to block the assimilation process of the dissolved carbon source by the activated sludge, so that the dissolved carbon source is greatly lost. Although the chemical enhanced flocculation process can flocculate and enrich most of granular colloidal carbon sources in the sewage through the chemical flocculant, the chemical enhanced flocculation process basically has no recovery effect on dissolved carbon sources. The membrane separation process can completely retain the granular colloidal carbon source in the reactor, but the membrane pollution, high energy consumption and poor recovery effect of the dissolved carbon source are still main factors limiting the development of the granular colloidal carbon source. From the existing carbon source recovery process, it can be found that most processes mainly aim at the recovery of the granular colloidal carbon source, and the low recovery rate of the dissolved carbon source is the bottleneck for limiting the further improvement of the recovery rate of the carbon source.
Disclosure of Invention
In order to solve the problem of low recovery rate of carbon sources in sewage, the invention provides a device, a method and application for strengthening recovery of dissolved carbon sources in sewage. The device for reinforcing the recovery of the dissolved carbon source in the sewage can be used for pertinently recovering various carbon sources, integrally improves the recovery rate of the carbon sources, is beneficial to resource utilization of the carbon sources in the sewage, enhances the availability of the produced sludge and realizes sustainable development of the process.
In order to achieve the above object, the present invention provides in a first aspect an apparatus for enhancing recovery of dissolved carbon source in sewage, comprising a materialization recovery tank and a biological recovery tank;
the physical and chemical recovery tank recovers granular and colloidal carbon sources in the sewage through flocculation and precipitation;
a biological recovery tank, wherein the biological recovery tank recovers dissolved carbon source by utilizing the assimilation and transformation process of microorganisms;
and the sewage treated by the materialized recovery tank enters a biological recovery tank to recover the dissolved carbon source.
The second aspect of the invention provides a method for enhancing the recovery of dissolved carbon source in sewage by adopting the device, which comprises the following steps:
(1) starting a water inlet pump and a dosing pump, enabling the sewage and the flocculating agent to enter a materialization recovery tank after being fully mixed by a static mixer, standing and precipitating, discharging partial supernatant, entering a biological recovery tank for treatment, and discharging and recovering the deposited carbon source through a sludge discharge valve at the bottom of the tank;
(2) and (3) carrying out aeration mixing reaction on the sewage in the biological recovery tank, standing, discharging part of supernatant, wherein the sludge deposited at the bottom of the tank is the sludge after assimilation recovery of dissolved carbon source, and discharging and recovering the sludge through a sludge discharge valve at the bottom of the biological recovery tank.
The third aspect of the invention provides an application of the device for enhancing the recovery of the dissolved carbon source in the sewage in the field of sewage resource treatment.
One or more embodiments of the present invention have at least the following advantageous effects:
(1) the invention firstly carries out flocculation precipitation enrichment on the granular colloidal carbon source in the sewage by utilizing a physical and chemical method, obtains better carbon source recovery rate (50-60%) with lower cost, simultaneously leads the yielding water carbon source to be mainly in a dissolved state, is convenient for the recovery of a subsequent biological recovery tank and reduces the recovery cost.
(2) The biological recovery tank utilizes biological assimilation to carry out enhanced recovery on the dissolved carbon source, further improves the overall carbon source recovery rate of the device (to be higher than 72%), improves the content of organic matters in the excess sludge, and is more beneficial to anaerobic digestion capacity.
(3) The sludge concentration of the biological recovery tank is low, and compared with the aeration quantity of the traditional activated sludge method, the aeration quantity is greatly reduced, so that the operation cost of the device is greatly reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of an apparatus for enhancing recovery of dissolved carbon source in sewage according to example 1 of the present invention;
wherein: 1-water inlet pump, 2-dosing tank, 3-dosing pump, 4-static mixer, 5-materialization recovery tank, 6-intermediate water pump, 7-sludge discharge valve, 8-aeration pump, 9-biological recovery tank, 10-aeration disc and 11-water outlet pump.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, the carbon source recovery process in the prior art mainly aims at the recovery of the granular colloidal carbon source, thereby limiting the improvement of the carbon source recovery rate. In order to solve the technical problems, the invention provides a device for strengthening the recovery of dissolved carbon sources in sewage, which comprises a materialization recovery tank and a biological recovery tank;
the physical and chemical recovery tank recovers granular and colloidal carbon sources in the sewage through flocculation and precipitation;
a biological recovery tank, wherein the biological recovery tank recovers dissolved carbon source by utilizing the assimilation and transformation process of microorganisms;
and the sewage treated by the materialized recovery tank enters a biological recovery tank to recover the dissolved carbon source.
The carbon source of the effluent of the materialized recovery tank is mainly in a dissolved state, so that the pertinence of carbon source recovery of the biological recovery tank is enhanced, and the recovery efficiency is obviously improved.
The technical principle of the invention is as follows: the materialization recovery tank destabilizes and gathers together granular colloidal carbon sources in the sewage by adding a chemical flocculant to form large granular easily-settled carbon sources, and then carries out enrichment recovery on the large granular easily-settled carbon sources through standing and settling. After the granular colloidal carbon source in the sewage is recovered by the materialization recovery tank, the carbon source of the effluent is mainly in a dissolved state, so that the interference of the granular colloidal carbon source on the recovery of the dissolved carbon source is reduced, and the process of assimilating the dissolved carbon source by the biological recovery tank is enhanced; the biological recovery tank obtains higher organic load by reducing the sludge concentration, so that microorganisms in the activated sludge under the aerobic condition are in logarithmic growth, dissolved carbon sources in the sewage can be assimilated efficiently, and the carbon source recovery rate is improved.
In one or more embodiments of the invention, a static mixer is arranged at the water inlet of the materialization recovery tank, the static mixer is connected with a chemical feeding tank and a water inlet pump, a flocculant is filled in the chemical feeding tank, and the chemical flocculant in the chemical feeding tank and water in the water inlet pump are fully mixed in the static mixer and then are sent to the materialization recovery tank.
Preferably, a dosing pump is arranged between the dosing tank and the static mixer.
In one or more embodiments of the invention, an intermediate water pump is arranged between the materialization recovery tank and the biological recovery tank, sludge discharge valves are arranged at the bottoms of the materialization recovery tank and the biological recovery tank, and the discharge of the residual sludge and the recovery of the carbon source are controlled by the sludge discharge valves.
In one or more embodiments of the invention, an aeration disc is arranged at the bottom of the biological recovery tank, an aeration pump is connected to the aeration disc, and the aeration disc and the aeration pump are matched to provide sufficient oxygen for the microorganisms in the biological recovery tank, so that the microorganisms can efficiently assimilate the dissolved carbon source in the sewage.
The second aspect of the invention provides a method for enhancing the recovery of dissolved carbon source in sewage by adopting the device, which comprises the following steps:
(1) starting a water inlet pump and a dosing pump, enabling the sewage and the flocculating agent to enter a materialization recovery tank after being fully mixed by a static mixer, standing and precipitating, discharging partial supernatant, entering a biological recovery tank for treatment, and discharging and recovering the deposited carbon source through a sludge discharge valve at the bottom of the tank;
(2) and (3) carrying out aeration mixing reaction on the sewage in the biological recovery tank, standing, discharging part of supernatant, wherein the sludge deposited at the bottom of the tank is the sludge after assimilation recovery of dissolved carbon source, and discharging and recovering the sludge through a sludge discharge valve at the bottom of the biological recovery tank.
In one or more embodiments of the invention, the wastewater is wastewater from a grit chamber or a surge tank of a wastewater treatment plant; the adding ratio of the sewage to the flocculating agent is 1L: 20-25 mg;
in one or more embodiments of the present invention, the flocculant is an inorganic flocculant (iron-based or aluminum-based), preferably an iron-based flocculant, and more preferably polymeric ferric sulfate, and is added in an amount of 10 to 80mg/L, preferably 20 mg/L.
In one or more embodiments of the invention, the concentration of sludge in the biological recovery tank is between 0.5 and 1.5g/L, preferably 0.7g/L, and the concentration of sludge in the tank is maintained stable by discharging excess sludge.
In one or more embodiments of the invention, the concentration of dissolved oxygen in the biological recovery tank is 1.5-4mg/L, preferably 2mg/L, and a microporous aeration disk is selected to achieve uniform aeration.
In one or more embodiments of the invention, the effluent of the biological recovery tank can enter an ecological process such as an artificial wetland or a microalgae reactor to further recover nitrogen and phosphorus resources therein, so that the full-efficient recovery and utilization of potential resources in sewage are realized.
In one or more embodiments of the invention, the excess sludge recovered by the invention can be subjected to anaerobic fermentation to generate energy so as to promote the realization of sewage treatment energy neutralization.
Preferably, in the steps (1) and (2), the standing and precipitating time is 25-40 min.
Or, in the step (1) and (2), the discharge amount of the supernatant is 50% of the effective volume.
Or, in the step (2), the time of aeration mixing reaction is 30-60 min.
Or, the method adopts an intermittent operation mode, and the operation time of one period is 70-120 min;
the physicochemical recovery tank comprises four stages of water inlet, precipitation, water outlet and idling, wherein the water inlet stage is 5-10min, the precipitation stage is 30-40min, the water outlet stage is 5-10min and the idling stage is 30-60 min;
the operation of the biological recovery tank is divided into four stages of water inlet, aeration, precipitation and water outlet, wherein the water inlet stage is 5m-10in, the aeration stage is 30-60min, the precipitation stage is 30-40min and the water outlet stage is 5-10 min;
the volume exchange rates of the two recovery pools are both 50%, and excess sludge is discharged in the water outlet stage to recover carbon sources.
And an intermittent operation mode is adopted, so that the aeration energy consumption can be effectively reduced, and the operation cost is reduced.
The third aspect of the invention provides an application of the device for enhancing the recovery of the dissolved carbon source in the sewage in the field of sewage resource treatment.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
As shown in fig. 1, the present embodiment provides an apparatus for enhancing recovery of dissolved carbon source in sewage, including: the system comprises a materialization recovery tank 5 and a biological recovery tank 9, wherein a static mixer 4 is arranged at a water inlet of the materialization recovery tank 5, the static mixer 4 is connected with a dosing tank 2 and a water inlet pump 1, a flocculating agent is filled in the dosing tank 2, and the chemical flocculating agent in the dosing tank 2 and water in the water inlet pump are fully mixed in the static mixer 4 and then are sent to the materialization recovery tank 5.
The sewage after the materialization recovery tank 5 is treated is sent to the biological recovery tank 9 through the middle water pump 6 to be continuously treated, the bottom of the biological recovery tank 9 is provided with an aeration disc 10, the aeration disc 10 is connected with an aeration pump 8, the aeration disc 10 and the aeration pump 8 are matched to provide sufficient oxygen for the microorganisms in the biological recovery tank, so that the microorganisms can efficiently assimilate the dissolved carbon source in the sewage, and the recovery of the dissolved carbon source is realized.
Sludge discharge valves 7 are arranged at the bottoms of the materialization recovery tank 5 and the biological recovery tank 9, and the discharge of the residual sludge and the recovery of the carbon source of the device are controlled by the sludge discharge valves 7.
Example 2:
a method for enhancing the recovery of dissolved carbon sources in sewage by adopting the device in the example 1 comprises the following steps:
(1) and (3) starting a water inlet pump and a dosing pump to ensure that the effluent of the grit chamber of the sewage treatment plant and the polymeric ferric sulfate are mixed by 1L: and (3) fully mixing the 20mg of carbon source in a static mixer, then entering a materialization recovery tank, standing and precipitating for 30min, discharging 50% of supernatant with effective volume, entering a biological recovery tank for treatment, and discharging and recovering the deposited carbon source through a sludge discharge valve at the bottom of the tank.
(2) After the supernatant fluid after the physicochemical flocculation treatment enters a biological recovery tank, an aeration mixing reaction is carried out for 30min, in the process, the concentration of dissolved oxygen in the biological recovery tank is 2mg/L, the concentration of sludge is 0.7g/L, then the biological recovery tank is kept still for precipitation for 30min, supernatant fluid with 50 percent of effective volume is discharged, and the sludge deposited at the bottom of the tank is discharged and recovered through a sludge discharge valve at the bottom of the tank.
The device adopts an intermittent operation mode, and the physicochemical recovery tank is divided into four stages of water inlet, precipitation, water outlet and idling during operation, wherein the water inlet stage is 5min, the precipitation stage is 40min, the water outlet stage is 5min and the idling stage is 60 min; the operation of the biological recovery tank is divided into four stages of water inlet, aeration, sedimentation and water outlet, wherein the water inlet stage is 5min, the aeration stage is 60min, the sedimentation stage is 40min and the water outlet stage is 5 min; the volume exchange rates of the two recovery pools are both 50%, and excess sludge is discharged in the water outlet stage to recover carbon sources.
The total COD concentration of the inlet water of the process is 320.6 +/-30.8 mg/L, the dissolved state COD concentration is 100.3 +/-20.8 mg/L, the ammonia nitrogen concentration is 37.8 +/-2.9 mg/L, the total nitrogen concentration is 56.6 +/-3.3 mg/L, and the total phosphorus concentration is 6.5 +/-1.2 mg/L; the total COD concentration of effluent of the process is 69.3 +/-15.6 mg/L, the dissolved COD concentration is 35.7 +/-13.8 mg/L, the ammonia nitrogen concentration is 27.8 +/-2.1 mg/L, the total nitrogen concentration is 47.6 +/-2.4 mg/L, and the total phosphorus concentration is 3.9 +/-1.3 mg/L; the recovery rate of the total COD in the process is 75.3 +/-2.1 percent through COD mass balance, and the recovery rate of the dissolved COD is 35.7 +/-5.6 percent.
Example 3:
a method for enhancing the recovery of dissolved carbon sources in sewage by adopting the device in the example 1 comprises the following steps:
(1) and (3) starting a water inlet pump and a dosing pump to ensure that the effluent of the regulating reservoir of the sewage treatment plant and the polymeric ferric sulfate are mixed in a volume of 1L: fully mixing 25mg of the carbon source with a static mixer, then feeding the mixture into a materialization recovery tank, standing and precipitating the mixture for 30min, discharging 50 percent of supernatant with effective volume, feeding the supernatant into a biological recovery tank for treatment, and discharging and recovering the deposited carbon source through a sludge discharge valve at the bottom of the tank.
(2) After the supernatant fluid after the physicochemical flocculation treatment enters a biological recovery tank, an aeration mixing reaction is carried out for 60min, in the process, the concentration of dissolved oxygen in the biological recovery tank is 2mg/L, the concentration of sludge is 0.9g/L, then the biological recovery tank is kept still and settled for 30min, supernatant fluid with 50 percent of effective volume is discharged, and the sludge deposited at the bottom of the tank is discharged and recovered through a sludge discharge valve at the bottom of the tank.
The device adopts an intermittent operation mode, and the physicochemical recovery tank is divided into four stages of water inlet, precipitation, water outlet and idling when in operation, wherein the water inlet stage is 10min, the precipitation stage is 30min, the water outlet stage is 10min and the idling stage is 30 min; the operation of the biological recovery tank is divided into four stages of water inlet, aeration, sedimentation and water outlet, wherein the water inlet stage is 10min, the aeration stage is 30min, the sedimentation stage is 30min and the water outlet stage is 10 min; the volume exchange rates of the two recovery pools are both 50%, and excess sludge is discharged in the water outlet stage to recover carbon sources.
The total COD concentration of the inlet water of the process is 286.7 +/-25.8 mg/L, the dissolved state COD concentration is 95.3 +/-21.6 mg/L, the ammonia nitrogen concentration is 30.8 +/-1.9 mg/L, the total nitrogen concentration is 40.6 +/-2.3 mg/L, and the total phosphorus concentration is 5.5 +/-0.9 mg/L; the total COD concentration of effluent of the process is 56.3 +/-13.6 mg/L, the dissolved COD concentration is 40.7 +/-12.8 mg/L, the ammonia nitrogen concentration is 22.8 +/-2.1 mg/L, the total nitrogen concentration is 33.6 +/-2.4 mg/L, and the total phosphorus concentration is 3.4 +/-1.3 mg/L; the recovery rate of the total COD in the process is 73.1 +/-2.3 percent through COD mass balance, and the recovery rate of the dissolved COD is 38.5 +/-4.2 percent.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a device for strengthening dissolving carbon source recovery in sewage which characterized in that: comprises a materialization recovery tank and a biological recovery tank;
the physical and chemical recovery tank recovers granular and colloidal carbon sources in the sewage through flocculation and precipitation;
a biological recovery tank, wherein the biological recovery tank recovers dissolved carbon source by utilizing the assimilation and transformation process of microorganisms;
and the sewage treated by the materialized recovery tank enters a biological recovery tank to recover the dissolved carbon source.
2. The apparatus of claim 1, wherein: a static mixer is arranged at a water inlet of the materialization recovery tank, the static mixer is connected with a dosing tank and a water inlet pump, a flocculating agent is filled in the dosing tank, and the chemical flocculating agent in the dosing tank and water in the water inlet pump are fully mixed in the static mixer and then are sent to the materialization recovery tank;
preferably, a dosing pump is arranged between the dosing tank and the static mixer.
3. The apparatus of claim 1, wherein: an intermediate water pump is arranged between the materialization recovery tank and the biological recovery tank, sludge discharge valves are arranged at the bottoms of the materialization recovery tank and the biological recovery tank, and the discharge of the residual sludge and the recovery of the carbon source are controlled by the sludge discharge valves.
4. The apparatus of claim 1, wherein: and an aeration disc is arranged at the bottom of the biological recovery tank and connected with an aeration pump.
5. A method for enhancing the recovery of dissolved carbon sources in sewage by using the device of any one of claims 1 to 4, wherein: the method comprises the following steps:
(1) starting a water inlet pump and a dosing pump, enabling the sewage and the flocculating agent to enter a materialization recovery tank after being fully mixed by a static mixer, standing and precipitating, discharging partial supernatant, entering a biological recovery tank for treatment, and discharging and recovering the deposited carbon source through a sludge discharge valve at the bottom of the tank;
(2) and (3) carrying out aeration mixing reaction on the sewage in the biological recovery tank, standing, discharging part of supernatant, wherein the sludge deposited at the bottom of the tank is the sludge after assimilation recovery of dissolved carbon source, and discharging and recovering the sludge through a sludge discharge valve at the bottom of the biological recovery tank.
6. The method of claim 5, wherein: the sewage is the effluent of a grit chamber or an adjusting tank of a sewage treatment plant;
or the addition ratio of the sewage to the flocculating agent is 1L: 20-25 mg;
or the flocculating agent is an inorganic flocculating agent, preferably an iron flocculating agent, and further preferably polymeric ferric sulfate, and the adding amount is 10-80mg/L, preferably 20 mg/L;
or the sludge concentration in the biological recovery tank is 0.5-1.5g/L, preferably 0.7g/L, and the stability of the sludge concentration in the tank is maintained by discharging excess sludge;
or the concentration of dissolved oxygen in the biological recovery tank is 1.5-4mg/L, preferably 2mg/L, and a microporous aeration disc is selected to ensure uniform aeration.
7. The method of claim 5, wherein: the effluent of the biological recovery tank can enter an artificial wetland, a microalgae reactor or other ecological processes to further recover nitrogen and phosphorus resources, so that the full-effect recovery and utilization of potential resources in the sewage are realized.
8. The method of claim 5, wherein: in the steps (1) and (2), standing and precipitating for 25-40 min;
or, in the steps (1) and (2), the discharge amount of the supernatant is 50% of the effective volume;
or, in the step (2), the time of aeration mixing reaction is 30-60 min.
9. The method of claim 5, wherein: an intermittent operation mode is adopted, and the operation time of one period is 70-120 min;
the physicochemical recovery tank comprises four stages of water inlet, precipitation, water outlet and idling, wherein the water inlet stage is 5-10min, the precipitation stage is 30-40min, the water outlet stage is 5-10min and the idling stage is 30-60 min;
the operation of the biological recovery tank is divided into four stages of water inlet, aeration, precipitation and water outlet, wherein the water inlet stage is 5m-10in, the aeration stage is 30-60min, the precipitation stage is 30-40min and the water outlet stage is 5-10 min;
the volume exchange rates of the two recovery pools are both 50%, and excess sludge is discharged in the water outlet stage to recover carbon sources.
10. The use of the apparatus for enhancing the recovery of carbon source dissolved in sewage according to any one of claims 1 to 4 in the field of sewage resource treatment.
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| CN202110373296.1A CN113087297A (en) | 2021-04-07 | 2021-04-07 | Device and method for enhancing recovery of dissolved carbon source in sewage and application |
| PCT/CN2021/092144 WO2022213440A1 (en) | 2021-04-07 | 2021-05-07 | Apparatus, method and application for strengthening recovery of dissolved carbon sources in sewage |
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2021
- 2021-04-07 CN CN202110373296.1A patent/CN113087297A/en active Pending
- 2021-05-07 WO PCT/CN2021/092144 patent/WO2022213440A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823815A (en) * | 2010-04-29 | 2010-09-08 | 太平洋水处理工程有限公司 | Novel process for strengthening sewage denitrogenation by carbon source pre-separation |
| US20140217015A1 (en) * | 2011-09-26 | 2014-08-07 | Evoqua Water Technologies Llc | Use of primary sludge for carbon source in an aerated-anoxic bioreactor system |
| CN105776751A (en) * | 2016-04-13 | 2016-07-20 | 太原理工大学 | Process for efficient separation of organic carbon source in sewage and energy development and utilization |
| CN110510802A (en) * | 2018-05-22 | 2019-11-29 | 同济大学 | A kind of the carbon source capture systems and method in Heisui River |
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