CN115403234A - Method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate - Google Patents
Method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate Download PDFInfo
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- CN115403234A CN115403234A CN202211043327.8A CN202211043327A CN115403234A CN 115403234 A CN115403234 A CN 115403234A CN 202211043327 A CN202211043327 A CN 202211043327A CN 115403234 A CN115403234 A CN 115403234A
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of 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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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Abstract
A method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate relates to the technical field of sewage treatment. The invention aims to solve the problems of insufficient carbon source and synchronous reduction of sludge yield in the current sewage treatment process. The method comprises the following steps: the method comprises the following steps: adding sewage and sludge into the SBR reactor, then adding free nitrite solution and sulfate solution, fermenting and culturing for 24-26 h while stirring, and controlling the oxidation-reduction potential to be-150 to-300 mV in the fermentation and culture process; step two: separating the sludge-water mixture after fermentation culture by standing precipitation, medicine adding separation or separation by adopting a screw stacking machine to respectively obtain supernatant and sludge; and (4) injecting the supernatant into the front end of the sewage treatment reactor, and directly discharging the sludge for disposal. The invention can obtain a method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate.
Background
The activated sludge process is widely used for biological wastewater treatment, and although it has a high efficiency of removing organic matter, it also generates a large amount of excess sludge, which must be treated and disposed of. However, sludge treatment and disposal costs are high, accounting for 60% of the total operating cost of a wastewater treatment plant (WWTP). Therefore, effective reduction of sludge production is becoming a great concern for researchers and practitioners.
Over the past several decades, various sludge reduction technologies have been developed that can be applied to sludge return lines to promote sludge degradation during wastewater treatment; it may also be used in sludge treatment lines to enhance aerobic or anaerobic digestion. Thermal, mechanical, electrical and chemical treatment techniques of the sludge are employed in the sludge recirculation line, wherein the recirculation/excess sludge or a portion thereof is treated and returned to the bioreactor for further biodegradation. These methods result in the destruction of bacterial cells by the disintegrating cell polymeric substances (EPS) of the outer membrane, so that the extracellular and intracellular components of the bacteria in the sludge are released, the released substances are reused by the microorganisms in the bioreactor, and a part of the carbon source is oxidized to CO by metabolism 2 Resulting in a 25% reduction in overall sludge biomass. Other physical methods, such as sonication, are currently used to reduce sludge production, but the process costs are prohibitive. Therefore, alternative methods of reducing sludge are not slow.
Disclosure of Invention
The invention aims to solve the problems of insufficient carbon source and synchronous reduction of sludge yield in the existing sewage treatment process, and provides a method for supplementing carbon source and reducing sludge based on free nitrite and sulfate.
A method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate comprises the following steps:
the method comprises the following steps: adding sewage and sludge taken out from a secondary sedimentation tank into an SBR reactor, then adding free nitrite solution and sulfate solution, fermenting and culturing for 24-26 h while stirring, and controlling the oxidation-reduction potential to be-150 to-300 mV in the fermentation and culture process; the ratio of the mass of nitrite in the free nitrite solution to the mass of sulfate in the sulfate solution to the volume of sludge is 20mg:20mg:1L;
step two: after the fermentation culture is finished, separating the sludge-water mixture after the fermentation culture by standing and precipitating, adding medicine for separation or adopting a separating mode of a screw stacking machine to respectively obtain supernatant and sludge; and injecting the supernatant into the front end of the sewage treatment reactor, and directly discharging the sludge for disposal.
The principle of the invention is as follows:
adding free nitrous acid (FNA or HNO) into sludge in the secondary sedimentation tank 2 ) Biological disruption of microbial cells in the sludge can be realized, and the sludge is decomposed and partially degraded; with addition of Sulphate (SO) 4 2- ) Under the condition of controlling the anaerobic condition, sulfate reducing bacteria in the sludge can grow rapidly, the biological breaking and degradation of the sludge are further accelerated, the decomposed sludge can be disintegrated to release a carbon source and a part of nitrogen source, water molecules can be automatically separated in the modes of static sedimentation, dosing and the like, most of the carbon source can be released into the sewage of the supernatant, and then the sewage is refluxed to the front stage of sewage treatment to supplement the carbon source in the sewage.
The invention has the beneficial effects that:
the invention provides a method based on free nitrous acid (FNA or HNO) 2 ) And Sulfates (SO) 4 2- ) The sludge reduction is realized by a new treatment strategy, and the specific method is that sludge generated by a secondary sedimentation tank is utilized, part of sludge is taken out to be added with free nitrite and sulfate in an SBR bioreactor, and the mixture is stirred and reacted for 24 hours. The sludge is decomposed in the reactor to form a new carbon source and a partially denitrified nitrogen source, and the new carbon source and the partially denitrified nitrogen source pass throughThe flow method returns to the front end of the biological treatment process, and can provide a carbon source for the existing sewage treatment process, thereby reducing the adding amount of the carbon source.
The invention can solve the problem of insufficient carbon source of the urban sewage, reduce the output of the sludge and is the most effective method for solving the problems of insufficient carbon source of the urban sewage and sludge reduction.
The invention can obtain a method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate.
Drawings
FIG. 1 is a process flow diagram of a method for achieving carbon source supplementation and sludge reduction based on free nitrite and sulfate according to the present invention.
Detailed Description
The first specific implementation way is as follows: the embodiment of the invention relates to a method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate, which comprises the following steps:
the method comprises the following steps: adding sewage and sludge taken out from a secondary sedimentation tank into an SBR reactor, then adding free nitrite solution and sulfate solution, fermenting and culturing for 24-26 h while stirring, and controlling the oxidation-reduction potential to be-150 to-300 mV in the fermentation and culture process; the ratio of the mass of nitrite in the free nitrite solution to the mass of sulfate in the sulfate solution to the volume of sludge is 20mg:20mg:1L;
step two: after the fermentation culture is finished, separating the sludge-water mixture after the fermentation culture by standing and precipitating, adding medicine for separation or adopting a separating mode of a screw stacking machine to respectively obtain supernatant and sludge; and (4) injecting the supernatant into the front end of the sewage treatment reactor, and directly discharging the sludge for disposal.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: in the first step, the volume ratio of sewage to sludge is 1:1; the sewage is treated sewage or supernatant in a secondary sedimentation tank; the concentration of the sludge is 5000-7000 mg/L, and the water content is 80-90%.
Other steps are the same as those in the first embodiment.
The third concrete implementation mode: the first or second difference between the present embodiment and the second embodiment is: in the first step, the free nitrite solution is formed by mixing nitrite and water, the concentration of the free nitrite solution is 20-25 mg/L, and the pH value is 3-5.
The other steps are the same as those in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is: the free nitrite solution is free sodium nitrite solution.
The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: in the first step, the sulfate solution is formed by mixing sulfate and water, the concentration of the sulfate solution is 50-55 mg/L, and the pH value is 3-5.
The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode is as follows: the difference between this embodiment and one of the first to fifth embodiments is as follows: the sulfate solution is a sodium sulfate solution.
The other steps are the same as those in the first to fifth embodiments.
The seventh concrete implementation mode: the difference between this embodiment and one of the first to sixth embodiments is: the stirring speed in the first step is 60-120 r/min.
The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: in the first step, fermentation culture is carried out at the temperature of 25-35 ℃.
The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: and the standing and precipitating time in the second step is 30-35 min.
The other steps are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the difference between this embodiment and the first to ninth embodiments is: and the medicament added and separated in the step two is polyaluminium chloride or calcium chloride, and the addition amount of the medicament is 25mg/L.
The other steps are the same as those in the first to ninth embodiments.
The following examples were employed to demonstrate the beneficial effects of the present invention:
example 1: a method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate comprises the following steps:
the method comprises the following steps: adding sewage and sludge (without plate-and-frame filter pressing) taken out of a secondary sedimentation tank into an SBR reactor, then adding a free sodium nitrite solution and a sodium sulfate solution, stirring at a stirring speed of 120r/min, fermenting and culturing for 24 hours at a temperature of 35 ℃, controlling an oxidation-reduction potential (ORP) to be-200 mV in the fermentation and culture process, realizing anaerobic fermentation and sludge degradation, sealing the SBR reactor, and simultaneously forming an anaerobic condition after stirring for about 5 hours because the sulfate reducing bacteria consume oxygen due to growth.
The ratio of the mass of sodium nitrite in the free sodium nitrite solution to the mass of sodium sulfate in the sodium sulfate solution to the volume of the sludge is 20mg:20mg:1L of the total amount of the active ingredients.
The volume ratio of sewage to sludge is 1:1; the sewage is treated sewage or supernatant in a secondary sedimentation tank; the concentration of the sludge is 5000-7000 mg/L, and the water content is 80-90%.
The free sodium nitrite solution is formed by mixing sodium nitrite and water, the concentration of the free sodium nitrite solution is 20mg/L, and the pH value is 3-5.
The sodium sulfate solution is formed by mixing sodium sulfate and water, the concentration of the sodium sulfate solution is 50mg/L, and the pH value is 3-5.
Step two: after the fermentation culture is finished, standing and precipitating for 30min, and separating the sludge-water mixture after the fermentation culture to respectively obtain supernatant and sludge; injecting the supernatant into the front end of a sewage treatment reactor, wherein the content of a carbon source in the incoming water is generally required to be measured, and the effect of removing total nitrogen and ammonia nitrogen in the tail-end sewage is required to be realized; and directly discharging the sludge for disposal.
Test part:
free nitrous acid (FNA or HNO) 2 ) Inhibition of metabolism (ppb) by many key microorganisms involved in wastewater treatment has been well documented, and partial reflux/FNA treatment of excess sludge can be used as a strategy to achieve sludge reduction. To verify this possibility, two laboratory scale Sequencing Batch Reactors (SBR) were used to treat the synthetic domestic wastewater. One is an experimental reactor which comprises a dosing device of FNA and a dosing device of sulfate, wherein 50 percent of residual sludge is filled in the SBR reactor; the other was used as a control, while the redox potential of the control and dosed SBR reactors was controlled at around-150 mV. The MLSS concentrations in both SBRs were maintained at approximately the same level, and the experimental and control systems were monitored and compared for sludge yield, wastewater quality, nitrous oxide (N) 2 O, a potent greenhouse gas), sludge Volume Index (SVI), sludge particle size distribution and maximum activity. The sludge treated by the method of this example was decomposed by about 90%, and 50% or more of the carbon source and part of the nitrogen source could be recovered (the ratio of the carbon source to the nitrogen source to be recovered was usually 5.
Claims (10)
1. A method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate is characterized by comprising the following steps:
the method comprises the following steps: adding sewage and sludge taken out from a secondary sedimentation tank into an SBR reactor, then adding free nitrite solution and sulfate solution, fermenting and culturing for 24-26 h while stirring, and controlling the oxidation-reduction potential to be-150 to-300 mV in the fermentation and culture process; the ratio of the mass of nitrite in the free nitrite solution to the mass of sulfate in the sulfate solution to the volume of sludge is 20mg:20mg:1L;
step two: after the fermentation culture is finished, separating the sludge-water mixture after the fermentation culture by standing and precipitating, adding medicine for separation or adopting a separation mode of a screw stacking machine to respectively obtain supernatant and sludge; and injecting the supernatant into the front end of the sewage treatment reactor, and directly discharging the sludge for disposal.
2. The method for supplementing carbon source and reducing sludge based on free nitrite and sulfate as claimed in claim 1, wherein the volume ratio of sewage to sludge in the first step is 1:1; the sewage is treated sewage or supernatant in a secondary sedimentation tank; the concentration of the sludge is 5000-7000 mg/L, and the water content is 80-90%.
3. The method for supplementing a carbon source and reducing sludge based on free nitrite and sulfate as claimed in claim 1, wherein the free nitrite solution in the first step is formed by mixing nitrite and water, and has a concentration of 20-25 mg/L and a pH of 3-5.
4. The method for supplementing carbon source and reducing sludge based on free nitrite and sulfate as claimed in claim 1 or 3, wherein said free nitrite solution is free sodium nitrite solution.
5. The method of claim 1, wherein the sulfate solution in the first step is prepared by mixing sulfate and water, the sulfate solution has a concentration of 50-55 mg/L and a pH of 3-5.
6. The method of claim 1 or 5, wherein the sulfate solution is sodium sulfate solution.
7. The method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate as claimed in claim 1, wherein the stirring rate in the first step is 60-120 r/min.
8. The method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate as claimed in claim 1, wherein the fermentation culture is performed at a temperature of 25-35 ℃ in the first step.
9. The method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate as claimed in claim 1, wherein the standing and precipitating time in the second step is 30-35 min.
10. The method for realizing carbon source supplement and sludge reduction based on free nitrite and sulfate as claimed in claim 1, wherein the agent separated by adding in the second step is polyaluminium chloride or calcium chloride, and the addition amount of the agent is 25mg/L.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106477846A (en) * | 2016-11-25 | 2017-03-08 | 太原理工大学 | Hydrogen the method for reclaiming guanite are produced using free nitrite enhancement microbiological electroplating sludge |
| CN107446961A (en) * | 2017-09-08 | 2017-12-08 | 太原理工大学 | A kind of method that sulfate reducing bacteria converts for mediation reinforcement sludge carbon source |
| CN108217950A (en) * | 2018-03-13 | 2018-06-29 | 北京工业大学 | The device and method that FNA reinforcement sludges ferment and realize sewerage short-cut denitrification dephosphorization |
| CN108328894A (en) * | 2018-03-22 | 2018-07-27 | 湖南大学 | A method of promoting residual sludge reduction |
| CN110386717A (en) * | 2018-04-17 | 2019-10-29 | 香港科技大学 | Sulfate reduction-is aerobic-precipitating-anaerobic system and its technique |
| CN113003716A (en) * | 2021-02-20 | 2021-06-22 | 北京工业大学 | Device and method for synchronously treating nitrite nitrogen wastewater and excess sludge |
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- 2022-08-29 CN CN202211043327.8A patent/CN115403234A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106477846A (en) * | 2016-11-25 | 2017-03-08 | 太原理工大学 | Hydrogen the method for reclaiming guanite are produced using free nitrite enhancement microbiological electroplating sludge |
| CN107446961A (en) * | 2017-09-08 | 2017-12-08 | 太原理工大学 | A kind of method that sulfate reducing bacteria converts for mediation reinforcement sludge carbon source |
| CN108217950A (en) * | 2018-03-13 | 2018-06-29 | 北京工业大学 | The device and method that FNA reinforcement sludges ferment and realize sewerage short-cut denitrification dephosphorization |
| CN108328894A (en) * | 2018-03-22 | 2018-07-27 | 湖南大学 | A method of promoting residual sludge reduction |
| CN110386717A (en) * | 2018-04-17 | 2019-10-29 | 香港科技大学 | Sulfate reduction-is aerobic-precipitating-anaerobic system and its technique |
| CN113003716A (en) * | 2021-02-20 | 2021-06-22 | 北京工业大学 | Device and method for synchronously treating nitrite nitrogen wastewater and excess sludge |
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