CN111484208A - Sewage treatment system and method for carbon-captured sludge for denitrification synchronous regeneration - Google Patents
Sewage treatment system and method for carbon-captured sludge for denitrification synchronous regeneration Download PDFInfo
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- 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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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- 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 discloses a sewage treatment system for carbon-captured sludge for denitrification synchronous regeneration, which comprises a carbon source capturing pool, a carbon source collecting pool, a primary aerobic pool, a denitrification pool, a secondary aerobic pool and a sludge sedimentation pool, wherein a sludge outlet on the carbon source collecting pool is communicated with the denitrification pool, and a sludge outlet on the sludge sedimentation pool is communicated with both the carbon source capturing pool and the primary aerobic pool. The sewage treatment method comprises the following steps: a) aeration and flocculation of organic matter; b) natural settling and separation; c) primary aerobic action; d) denitrification; e) secondary aerobic action; f) sedimentation and sludge recirculation. According to the sewage treatment system and method, organic matters in the sewage are used as the carbon source of the denitrifying bacteria, no additional supplementary carbon source is needed, the full utilization of resources and energy sources is realized, the synchronous regeneration of the carbon capture sludge is realized, no additional chemical substances are added in the whole sewage treatment process, and the sewage treatment cost is reduced.
Description
Technical Field
The invention relates to a sewage treatment system and a sewage treatment method, in particular to a sewage treatment system and a sewage treatment method for carbon capture sludge for denitrification synchronous regeneration.
Background
The current municipal sewage treatment process usually aims to remove pollutants, and the pollutants (such as organic matters, nitrogen elements, phosphorus elements and the like) are not only water quality indexes, but also energy and resources required in human production and life.
The existing biological treatment process of urban sewage removes pollutants in the sewage, but wastes energy and resources, which is contrary to sustainable development. The basic requirements of future sewage treatment technology are to realize energy recovery and resource utilization in sewage while reducing pollutant discharge. The sludge rich in organic matters (referred to as carbon capture sludge) after flocculation and sedimentation not only can provide organic matters (carbon sources) for denitrifying bacteria, but also can recapture new organic matters (carbon sources) when the organic matters in the sludge are consumed, thereby realizing the regeneration of the carbon capture sludge. Therefore, the sludge containing organic matters in the sewage treatment process and the sludge with the organic matters in the sludge removed can be utilized, the full utilization of energy and resources in the sewage is undoubtedly realized, and the consumption of the energy and the resources is reduced.
The invention aims to provide a sewage treatment process which fully utilizes original resources in sewage, realizes reasonable distribution of pollutants, purifies the sewage by a biological method, avoids unnecessary energy consumption, reduces the sewage treatment cost and can achieve better sewage treatment effect.
Disclosure of Invention
In order to overcome the defects of the technical problems, the invention provides a sewage treatment system and method for carbon capture sludge for denitrification synchronous regeneration.
The invention relates to a sewage treatment system for synchronous denitrification regeneration of carbon-captured sludge, which comprises a carbon source capturing pool, a carbon source collecting pool and a sludge settling pool, wherein a water inlet of the carbon source capturing pool is used for introducing sewage to be treated, a water outlet of the carbon source capturing pool is communicated with a water inlet of the carbon source collecting pool, and a primary aerobic pool, a denitrification pool and a secondary aerobic pool are sequentially arranged between the carbon source collecting pool and the sludge settling pool along the sewage flow direction; activated sludge in the carbon source capture pool rapidly flocculates organic substances and other particulate substances in the sewage, and the sewage naturally settles in the carbon source collection pool to separate sludge with high organic matter concentration from supernatant; the method is characterized in that: a sludge outlet on the carbon source collecting tank is communicated with a sludge inlet on the denitrification tank through a sludge pipeline and is used for supplementing the sludge rich in organic matters in the carbon source collecting tank into the denitrification tank and providing a carbon source for the denitrification process of denitrifying bacteria; the sludge outlet of the sludge sedimentation tank is communicated with the sludge inlet on the carbon source capture tank and the sludge inlet on the primary aerobic tank through a sludge pipeline, the synchronous regeneration of the carbon capture sludge is realized after organic matters in the sludge are consumed in the denitrification tank and the secondary aerobic tank, and the regenerated carbon capture sludge is precipitated in the sludge sedimentation tank and then flows back to the carbon source capture tank and the primary aerobic tank, so that the supplement of the sludge and microorganisms is realized.
The carbon-captured sludge is used for a sewage treatment system with denitrification synchronous regeneration, aeration devices are arranged in the carbon source capturing pool, the primary aerobic pool and the secondary aerobic pool, and the denitrification pool is in an anoxic state.
The invention discloses a treatment method of a sewage treatment system for synchronous regeneration of denitrification by using carbon-captured sludge, which is characterized by comprising the following steps of:
a) aeration and flocculation of organic matter; sewage filtered by the grid enters a carbon source capturing pool, the aeration in the carbon source capturing pool fully mixes the original sewage with the entered sewage, and the original microorganisms in the sewage spontaneously secrete viscous substances, spontaneously adsorb organic matters and suspended particles in the sewage and flocculate; meanwhile, because the concentration of organic matters in the sewage is higher and oxygen is supplemented by aeration, the propagation speed of microorganisms is higher, and the microorganisms have certain removal effect on pollutants in the sewage;
b) natural settling and separation; after sewage enters a carbon source collecting tank, sludge rich in organic matters is separated from the sewage through natural sedimentation to form sludge with high organic matter concentration and supernatant; supernatant sewage containing ammonium ions and other easily soluble pollutants enters a primary aerobic tank;
c) the sewage enters the primary aerobic tank, ammonium ions in the sewage are oxidized into nitrate ions by using the oxidation of aerobic bacteria in the primary aerobic tank under the aeration condition, water-soluble organic matters are oxidized, and meanwhile, phosphorus-feeding bacteria absorb a large amount of phosphate under the aerobic condition; the sewage treated by the microbial oxidation enters a denitrification tank;
d) denitrification, after the sewage enters the denitrification tank, the anoxic state of the denitrification tank is suitable for the growth and the propagation of denitrifying bacteria, sludge which is collected by the excess carbon source collecting tank and is rich in organic matters is added according to the concentration of nitrate in the denitrification tank, and the denitrifying bacteria convert nitrate radicals into nitrogen gas through denitrification and discharge the nitrogen gas into the air by taking the organic matters in the sludge as a carbon source; the sewage after denitrification reaction enters a secondary aerobic tank;
e) the secondary aerobic action is characterized in that sludge collected by the excessive carbon source collecting tank is added into the denitrification tank, so that the sewage in the secondary aerobic tank contains a small amount of ammonium ions and organic matters, the aerobic bacteria remove the residual ammonium ions and organic matters in the sewage entering the secondary aerobic tank under the aeration condition, and the sewage after the secondary aerobic treatment enters the sludge sedimentation tank;
f) and (3) precipitating and sludge refluxing, wherein sewage is precipitated in a sludge precipitation tank, the liquid at the upper part is discharged as treated sewage, and the sludge containing a large number of microorganisms at the bottom part is refluxed to a carbon source capturing tank and a primary aerobic tank so as to supplement the sludge concentration and the microorganism content in the carbon source capturing tank and the primary aerobic tank and improve the sewage treatment effect.
According to the treatment method of the sewage treatment system for the denitrification synchronous regeneration by using the carbon capture sludge, the aeration device in the carbon source capture pool generates large bubbles and mainly plays a stirring role; the retention time of the sewage in the carbon source capturing pool is short so as to retain organic matters as much as possible, and the organic matters are used as a carbon source for denitrification.
According to the treatment method of the sewage treatment system for the denitrification synchronous regeneration of the carbon capture sludge, the sludge adsorption capacity in the carbon source capture pool and the carbon source collection pool is strong, but the adsorption capacity has a saturation value, the saturated sludge enters the denitrification pool for utilization and culture, the organic matters adsorbed in the sludge are oxidized and decomposed, the adsorption capacity of the sludge is recovered, meanwhile, the oxidized nitrogen element in the sewage is reduced into nitrogen, and the sludge reflowing from the sludge sedimentation pool achieves the effect of sludge adsorption regeneration.
According to the treatment method of the sewage treatment system for the denitrification synchronous regeneration by using the carbon capture sludge, disclosed by the invention, a large amount of aeration is carried out in the primary aerobic tank and the secondary aerobic tank so as to ensure that the dissolved oxygen in the tanks is at a higher concentration and ensure the quality of effluent.
According to the treatment method of the sewage treatment system for the denitrification synchronous regeneration by using the carbon capture sludge, excess sludge rich in organic matters collected in the carbon source collecting tank is processed, and resource recycling is realized.
The invention has the beneficial effects that: the sewage treatment system comprises a carbon source capture pool, a carbon source collection pool, a primary aerobic pool, a denitrification pool, a secondary aerobic pool and a sludge sedimentation pool, organic matters and other particulate matters in sewage are flocculated in the sludge by microorganisms in the sludge after the sewage to be treated passes through the carbon source capture and sedimentation pool, and ammonium ions, phosphates and organic matters in the sewage are removed by the aerobic microorganisms and denitrifying bacteria after the sewage passes through the primary aerobic, denitrification and secondary aerobic actions. Because the sludge which is rich in organic matters and collected by the carbon source collecting tank is used as a carbon source to be added into the denitrification tank and used as an energy source of denitrifying bacteria, when the denitrifying bacteria consume the organic matters in the sludge, the sludge is converted into activated sludge (carbon capture sludge) which can be absorbed by the organic matters again, and the regenerated carbon capture sludge is sent to the carbon capture tank and the primary aerobic tank to be reused, thereby realizing the recycling of the sludge. Meanwhile, original organic matters and nitrogen-containing compounds in the sewage are fully utilized, and microorganisms with different functions are combined, so that pollutants in the water are removed without adding additional chemical substances, and the sewage treatment cost is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of a sewage treatment system for simultaneous denitrification regeneration of carbon-captured sludge according to the present invention.
In the figure: 1 a carbon source capture pool, 2 a carbon source collection pool, 3 a primary aerobic pool, 4 a denitrification pool, 5 a secondary aerobic pool and 6 a sludge sedimentation pool.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in figure 1, the schematic diagram of the sewage treatment system for simultaneous denitrification regeneration of carbon-captured sludge of the present invention is provided, which comprises a carbon source capturing tank 1, a carbon source collecting tank 2, a primary aerobic tank 3, a denitrification tank 4, a secondary aerobic tank 5 and a sludge settling tank 6, wherein a water inlet of the carbon source capturing tank 1 is communicated with a water inlet of sewage to be treated, a water outlet of the carbon source capturing tank 1 is communicated with a water inlet of the carbon source collecting tank 2, a water outlet of the carbon source collecting tank 2 is communicated with a water inlet of the primary aerobic tank 3, a water outlet of the primary aerobic tank 3 is communicated with a water inlet of the denitrification tank 4, a water outlet of the denitrification tank 4 is communicated with a water inlet of the secondary aerobic tank 5, a water outlet of the secondary aerobic tank 5 is communicated with a water inlet of the sludge settling tank 6, and sewage after sewage is discharged through a water outlet of the sludge settling tank 6. Aeration devices are arranged in the carbon source capturing pool 1, the primary aerobic pool 3 and the secondary aerobic pool 5, a sludge outlet of the carbon source collecting pool 2 is communicated with a sludge inlet of the denitrification pool 4 through a sludge pipeline, and a sludge outlet of the sludge sedimentation pool 6 is communicated with sludge inlets of the carbon source capturing pool 1 and the primary aerobic pool 3 through sludge pipelines.
After sewage enters a carbon source capture pool 1, microorganisms in activated sludge are utilized to rapidly flocculate organic matters and other particulate matters in the sewage, and the flocculated sewage enters a carbon source collection pool 2 and then naturally settles to form supernatant and sludge rich in organic matters. The sludge outlet of the carbon source collecting tank 2 is communicated with the sludge inlet of the denitrification tank 4 through a pipeline, so that the sludge rich in organic matters in the carbon source collecting tank 2 is sent into the denitrification tank 4, and the organic matters in the sludge are used as energy (carbon source) of denitrifying bacteria. And (3) under the aeration condition, the aerobic microorganisms oxidize ammonium ions in the sewage into nitrate ions, oxidize organic matters in the sewage, and absorb phosphate in the sewage by the phosphophagemids in the sewage.
After the sewage enters the denitrification tank 4, the denitrifying bacteria convert nitrate ions generated in the primary aerobic stage into nitrogen gas to be removed by using organic matters in the added sludge as a carbon source; after the sewage enters a secondary aerobic tank 5, removing ammonium ions and organic matters brought by the sludge added into the denitrification tank 4 by aerobic bacteria; after sewage enters the sludge sedimentation tank 6, the sewage is sedimentated, supernatant is discharged as the processed sewage, and sludge with microorganisms at the bottom flows back to the carbon source capture tank 1 and the primary aerobic tank 3, so that the sludge and the microorganisms are supplemented.
The invention relates to a treatment method of a sewage treatment system for synchronous denitrification regeneration of carbon-captured sludge, which is realized by the following steps:
a) aeration and flocculation of organic matter; sewage filtered by the grid enters a carbon source capturing pool, the aeration in the carbon source capturing pool fully mixes the original sewage with the entered sewage, and the original microorganisms in the sewage spontaneously secrete viscous substances, spontaneously adsorb organic matters and suspended particles in the sewage and flocculate; meanwhile, because the concentration of organic matters in the sewage is higher and oxygen is supplemented by aeration, the propagation speed of microorganisms is higher, and the microorganisms have certain removal effect on pollutants in the sewage;
an aeration device in the carbon source capturing pool generates large bubbles which mainly play a role in stirring; the retention time of the sewage in the carbon source capturing pool is short so as to retain organic matters as much as possible, and the organic matters are used as a carbon source for denitrification.
b) Natural settling and separation; after sewage enters a carbon source collecting tank, sludge rich in organic matters is separated from the sewage through natural sedimentation to form sludge with high organic matter concentration and supernatant; supernatant sewage containing ammonium ions and other easily soluble pollutants enters a primary aerobic tank;
and processing the redundant sludge rich in organic matters collected in the carbon source collecting tank to realize resource recycling.
c) The sewage enters the primary aerobic tank, ammonium ions in the sewage are oxidized into nitrate ions by using the oxidation of aerobic bacteria in the primary aerobic tank under the aeration condition, water-soluble organic matters are oxidized, and meanwhile, phosphorus-feeding bacteria absorb a large amount of phosphate under the aerobic condition; the sewage treated by the microbial oxidation enters a denitrification tank;
a large amount of aeration is carried out in both the primary aerobic tank and the secondary aerobic tank so as to ensure that the dissolved oxygen in the tanks has higher concentration and ensure the quality of the effluent.
d) Denitrification, after the sewage enters the denitrification tank, the anoxic state of the denitrification tank is suitable for the growth and the propagation of denitrifying bacteria, sludge which is collected by the excess carbon source collecting tank and is rich in organic matters is added according to the concentration of nitrate in the denitrification tank, and the denitrifying bacteria convert nitrate radicals into nitrogen gas through denitrification and discharge the nitrogen gas into the air by taking the organic matters in the sludge as a carbon source; the sewage after denitrification reaction enters a secondary aerobic tank;
e) the secondary aerobic action is characterized in that sludge collected by the excessive carbon source collecting tank is added into the denitrification tank, so that the sewage in the secondary aerobic tank contains a small amount of ammonium ions and organic matters, the aerobic bacteria remove the residual ammonium ions and organic matters in the sewage entering the secondary aerobic tank under the aeration condition, and the sewage after the secondary aerobic treatment enters the sludge sedimentation tank;
f) and (3) precipitating and sludge refluxing, wherein sewage is precipitated in a sludge precipitation tank, the liquid at the upper part is discharged as treated sewage, and the sludge containing a large number of microorganisms at the bottom part is refluxed to a carbon source capturing tank and a primary aerobic tank so as to supplement the sludge concentration and the microorganism content in the carbon source capturing tank and the primary aerobic tank and improve the sewage treatment effect.
The sludge adsorption capacity in the carbon source capture pool and the carbon source collection pool is strong, but the adsorption capacity has a saturation value, the saturated sludge enters the denitrification pool to be utilized and cultured, organic matters adsorbed in the sludge are oxidized and decomposed, the adsorption capacity of the sludge is recovered, meanwhile, the oxidized nitrogen element in the sewage is reduced into nitrogen, and the sludge flowing back from the sludge sedimentation pool reaches the effect of sludge adsorption regeneration.
Therefore, the sewage treatment method of the invention has the advantages that the sludge formed by the flocculation of the organic matters in the sewage by the microorganisms is firstly used as the carbon source of the denitrifying bacteria, so that the self-purification treatment is realized by fully utilizing the energy and resources contained in the sewage, the additional supplement of the carbon source is not needed, the full utilization of the resources and the energy is realized, and no waste is caused; the sludge can be processed and utilized under the condition that the sludge is remained. In the process that organic matters rich in the sludge are consumed by denitrifying bacteria, the sludge is converted into activated sludge which can absorb the organic matters again, the synchronous regeneration of the carbon capture sludge is realized, the regenerated carbon capture sludge is sent to the carbon capture pool and the primary aerobic pool for reuse, and the repeated recycling of the sludge is realized. And no extra chemical substances are added in the whole sewage treatment process, so that the sewage treatment cost is reduced.
Claims (7)
1. A sewage treatment system for carbon capture sludge for denitrification synchronous regeneration comprises a carbon source capture pool (1), a carbon source collecting pool (2) and a sludge settling pool (6), wherein a water inlet of the carbon source capture pool is used for introducing sewage to be treated, a water outlet of the carbon source capture pool is communicated with a water inlet of the carbon source collecting pool, and a primary aerobic pool (3), a denitrification pool (4) and a secondary aerobic pool (5) are sequentially arranged between the carbon source collecting pool and the sludge settling pool along the sewage flow direction; activated sludge in the carbon source capture pool rapidly flocculates organic substances and other particulate substances in the sewage, and the sewage naturally settles in the carbon source collection pool to separate sludge with high organic matter concentration from supernatant; the method is characterized in that: a sludge outlet on the carbon source collecting tank (2) is communicated with a sludge inlet on the denitrification tank (4) through a sludge pipeline and is used for supplementing the sludge rich in organic matters in the carbon source collecting tank into the denitrification tank and providing a carbon source for the denitrification process of denitrifying bacteria; the sludge outlet of the sludge sedimentation tank (6) is communicated with the sludge inlet on the carbon source capture tank (1) and the sludge inlet on the primary aerobic tank (3) through a sludge pipeline, the synchronous regeneration of the carbon capture sludge is realized after organic matters in the sludge are consumed in the denitrification tank and the secondary aerobic tank, the regenerated carbon capture sludge is precipitated in the sludge sedimentation tank (6) and then flows back to the carbon source capture tank (1) and the primary aerobic tank (3), and the supplement of the sludge and microorganisms is realized.
2. The sewage treatment system for simultaneous denitrification regeneration of carbon-captured sludge according to claim 1, wherein: aeration devices are arranged in the carbon source capturing tank (1), the primary aerobic tank (3) and the secondary aerobic tank (5), and the denitrification tank (4) is in an anoxic state.
3. A method for treating a sewage treatment system for simultaneous denitrification regeneration based on the carbon-captured sludge of claim 2, comprising the steps of:
a) aeration and flocculation of organic matter; sewage filtered by the grid enters a carbon source capturing pool, the aeration in the carbon source capturing pool fully mixes the original sewage with the entered sewage, and the original microorganisms in the sewage spontaneously secrete viscous substances, spontaneously adsorb organic matters and suspended particles in the sewage and flocculate; meanwhile, because the concentration of organic matters in the sewage is higher and oxygen is supplemented by aeration, the propagation speed of microorganisms is higher, and the microorganisms have certain removal effect on pollutants in the sewage;
b) natural settling and separation; after sewage enters a carbon source collecting tank, sludge rich in organic matters is separated from the sewage through natural sedimentation to form sludge with high organic matter concentration and supernatant; supernatant sewage containing ammonium ions and other easily soluble pollutants enters a primary aerobic tank;
c) the sewage enters the primary aerobic tank, ammonium ions in the sewage are oxidized into nitrate ions by using the oxidation of aerobic bacteria in the primary aerobic tank under the aeration condition, water-soluble organic matters are oxidized, and meanwhile, phosphorus-feeding bacteria absorb a large amount of phosphate under the aerobic condition; the sewage treated by the microbial oxidation enters a denitrification tank;
d) denitrification, after the sewage enters the denitrification tank, the anoxic state of the denitrification tank is suitable for the growth and the propagation of denitrifying bacteria, sludge which is collected by the excess carbon source collecting tank and is rich in organic matters is added according to the concentration of nitrate in the denitrification tank, and the denitrifying bacteria convert nitrate radicals into nitrogen gas through denitrification and discharge the nitrogen gas into the air by taking the organic matters in the sludge as a carbon source; the sewage after denitrification reaction enters a secondary aerobic tank;
e) the secondary aerobic action is characterized in that sludge collected by the excessive carbon source collecting tank is added into the denitrification tank, so that the sewage in the secondary aerobic tank contains a small amount of ammonium ions and organic matters, the aerobic bacteria remove the residual ammonium ions and organic matters in the sewage entering the secondary aerobic tank under the aeration condition, and the sewage after the secondary aerobic treatment enters the sludge sedimentation tank;
f) and (3) precipitating and sludge refluxing, wherein sewage is precipitated in a sludge precipitation tank, the liquid at the upper part is discharged as treated sewage, and the sludge containing a large number of microorganisms at the bottom part is refluxed to a carbon source capturing tank and a primary aerobic tank so as to supplement the sludge concentration and the microorganism content in the carbon source capturing tank and the primary aerobic tank and improve the sewage treatment effect.
4. The method of treating a sewage treatment system using carbon-captured sludge for simultaneous denitrification regeneration according to claim 3, wherein: an aeration device in the carbon source capturing pool generates large bubbles which mainly play a role in stirring; the retention time of the sewage in the carbon source capturing pool is short so as to retain organic matters as much as possible, and the organic matters are used as a carbon source for denitrification.
5. The method of treating a sewage treatment system using carbon-captured sludge for simultaneous denitrification regeneration according to claim 3, wherein: the sludge adsorption capacity in the carbon source capture pool and the carbon source collection pool is strong, but the adsorption capacity has a saturation value, the saturated sludge enters the denitrification pool to be utilized and cultured, organic matters adsorbed in the sludge are oxidized and decomposed, the adsorption capacity of the sludge is recovered, meanwhile, the oxidized nitrogen element in the sewage is reduced into nitrogen, and the sludge flowing back from the sludge sedimentation pool reaches the effect of sludge adsorption regeneration.
6. The method of treating a sewage treatment system using carbon-captured sludge for simultaneous denitrification regeneration according to claim 3, wherein: a large amount of aeration is carried out in the primary aerobic tank and the secondary aerobic tank so as to ensure that the dissolved oxygen in the tanks is at higher concentration and ensure the quality of the effluent.
7. The method of treating a sewage treatment system using carbon-captured sludge for simultaneous denitrification regeneration according to claim 3, wherein: and processing the redundant sludge rich in organic matters collected in the carbon source collecting tank to realize resource recycling.
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