CN117417074A - Method for deep denitrification and dephosphorization of sewage - Google Patents
Method for deep denitrification and dephosphorization of sewage Download PDFInfo
- Publication number
- CN117417074A CN117417074A CN202311421004.2A CN202311421004A CN117417074A CN 117417074 A CN117417074 A CN 117417074A CN 202311421004 A CN202311421004 A CN 202311421004A CN 117417074 A CN117417074 A CN 117417074A
- Authority
- CN
- China
- Prior art keywords
- sewage
- treatment
- nitrogen
- water
- dephosphorization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010865 sewage Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000011282 treatment Methods 0.000 claims abstract description 89
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 38
- 239000010802 sludge Substances 0.000 claims abstract description 33
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 28
- 238000005189 flocculation Methods 0.000 claims abstract description 22
- 230000016615 flocculation Effects 0.000 claims abstract description 22
- 230000003647 oxidation Effects 0.000 claims abstract description 19
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 19
- 238000011221 initial treatment Methods 0.000 claims abstract description 15
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 14
- 239000011574 phosphorus Substances 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000001556 precipitation Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 29
- 239000001301 oxygen Substances 0.000 claims description 29
- 229910052760 oxygen Inorganic materials 0.000 claims description 29
- 239000002351 wastewater Substances 0.000 claims description 27
- 244000005700 microbiome Species 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 17
- 239000003344 environmental pollutant Substances 0.000 claims description 16
- 241000894006 Bacteria Species 0.000 claims description 15
- 229910002651 NO3 Inorganic materials 0.000 claims description 12
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 12
- 238000004062 sedimentation Methods 0.000 claims description 12
- 239000008394 flocculating agent Substances 0.000 claims description 9
- 231100000719 pollutant Toxicity 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 238000004659 sterilization and disinfection Methods 0.000 claims description 8
- 238000005273 aeration Methods 0.000 claims description 7
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 6
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 6
- 230000001546 nitrifying effect Effects 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 5
- 239000004155 Chlorine dioxide Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- -1 leaves Substances 0.000 claims description 3
- 230000002503 metabolic effect Effects 0.000 claims description 3
- 230000000813 microbial effect Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000003472 neutralizing effect Effects 0.000 claims description 3
- 229910017464 nitrogen compound Inorganic materials 0.000 claims description 3
- 150000002830 nitrogen compounds Chemical class 0.000 claims description 3
- 244000052769 pathogen Species 0.000 claims description 3
- 239000002957 persistent organic pollutant Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 12
- 238000012512 characterization method Methods 0.000 description 3
- 238000012851 eutrophication Methods 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- 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
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Landscapes
- 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)
- Physical Water Treatments (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The application relates to the technical field of sewage treatment, and discloses a sewage deep denitrification and dephosphorization method, which comprises the following steps: step one, primary treatment, namely removing large-particle solids from sewage through the traditional primary treatment steps such as gratings, precipitation and the like; step two, biological treatment, namely introducing the sewage subjected to primary treatment into a biological treatment unit, and removing organic matters and part of nitrogen through an activated sludge reactor; and thirdly, performing physical and chemical flocculation, namely adding an environment-friendly chemical flocculation agent into the sewage treated in the second step, performing flocculation treatment on the sewage, and separating reclaimed water from flocculated materials and sludge by using centrifugal equipment after flocculation. By adding the advanced oxidation treatment step, the organic micropollutants containing nitrogen and phosphorus in the sewage are further decomposed by utilizing the cooperation of ultraviolet rays and hydrogen peroxide, and the hydrogen peroxide is decomposed by cooperating with the irradiation of the ultraviolet rays, so that the purposes of removing the micropollutants and not influencing the subsequent treatment of the sewage are achieved.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for deeply denitrifying and dephosphorizing sewage.
Background
The deep denitrification and dephosphorization of sewage is to further improve the nitrogen and phosphorus removal efficiency based on the traditional sewage treatment process so as to meet stricter emission standards. In order to reduce negative environmental impact, nitrogen and phosphorus are two common water contaminants that can lead to water eutrophication (eutrophication) and other environmental problems. Eutrophication refers to the excessive concentration of nitrogen and phosphorus in a water body, which results in the massive growth of algae and other aquatic plants, ultimately adversely affecting the ecosystem.
In the conventional sewage deep denitrification and dephosphorization method, micro pollutants such as medicine residues, micro components of organic matters and the like are generally difficult to thoroughly remove. These micro-pollutants may have potential impact on the environment and the ecosystem, and for this purpose, the invention proposes a method for deep denitrification and dephosphorization of sewage.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a sewage deep denitrification and dephosphorization method, which solves the problems that the sewage deep denitrification and dephosphorization method in the prior art is difficult to thoroughly remove micro pollutants such as medicine residues and micro components of organic matters.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a method for deeply denitrifying and dephosphorizing sewage comprises the following steps:
step one, primary treatment, namely removing large-particle solids from sewage through the traditional primary treatment steps such as gratings, precipitation and the like;
step two, biological treatment, namely introducing the sewage subjected to primary treatment into a biological treatment unit, and removing organic matters and part of nitrogen through an activated sludge reactor;
thirdly, performing physical and chemical flocculation, namely adding an environment-friendly chemical flocculation agent into the sewage treated in the second step, performing flocculation treatment on the sewage, and separating reclaimed water from flocculated materials and sludge by using centrifugal equipment after flocculation;
step four, filtering or adsorbing, and introducing the reclaimed water separated in the step three into a filter for filtering treatment so as to remove residual particulate matters, soluble organic matters and phosphorus and nitrogen in the wastewater;
step five, advanced oxidation treatment, namely leading the reclaimed water filtered in the step four to storage equipment, and removing micro pollutants by using an advanced oxidation technology;
step six, secondary biological treatment, namely introducing the water treated in the step five into a secondary biological treatment unit to further remove residual nitrogen;
and seventhly, final treatment and disinfection are carried out on the water body, so that the safety and qualified emission standard is ensured to be achieved.
Preferably, the primary treatment step in the first step includes:
the sewage firstly passes through a mechanical grating to remove sundries such as large-particle solids, leaves, paper and the like, and the grating spacing is adjustable according to the needs so as to adapt to solid particles with different particle diameters;
the water flow treated by the grating enters a sedimentation tank, and suspended matters of smaller particles are removed through gravity sedimentation, so that the smaller particles are settled to the bottom to form sludge;
oil and water separation is carried out by using an oil-water separator by utilizing the density difference of the oil and the water;
and (3) neutralizing the pH value of the wastewater according to the characteristics of the wastewater so as to meet the requirements of subsequent treatment.
Preferably, the activated sludge reactor in the second step comprises the following preparation steps:
providing sufficient oxygen to support metabolic activity of bacteria and microorganisms using an aeration device;
the uniform mixing of the microorganisms and the wastewater is maintained by the stirring device to ensure the uniformity of biological treatment.
Preferably, the step two of removing organic matters and nitrogen by the activated sludge reactor comprises the following steps:
the microorganisms degrade organic matters, and the organic matters can be adsorbed and decomposed by the microorganisms, so that the chemical oxygen demand and the biochemical oxygen demand in the wastewater are reduced;
in an oxygen-enriched environment, nitrite in the sewage is usually oxidized into nitrate by nitrifying bacteria in the active sewage, so that the aim of removing part of ammonia nitrogen is fulfilled;
denitrifying bacteria in the activated sludge reactor can reduce nitrate in the sewage into nitrogen, and the nitrogen in the sewage is deeply removed.
Preferably, the flocculation treatment in the third step comprises the following steps:
gradually adding the flocculating agent solution into the sewage subjected to biological treatment in a stoichiometric manner;
ensuring that the flocculating agent is uniformly dispersed in the sewage by stirring equipment so as to promote interaction between particles in the sewage and the flocculating agent;
introducing the sewage subjected to chemical flocculation treatment into a sedimentation tank so that larger flocculated bodies settle to the bottom;
a part of clear water in the sedimentation tank flows back to the biological treatment unit through the stripping equipment so as to maintain the water quality and the microbial community in the biological treatment system.
Preferably, the filtering in the fourth step includes the following steps:
when filtering, the sewage is pretreated, the pH value of the sewage is adjusted, and large-particle impurities are removed, so that the filter is prevented from being blocked or damaged;
the continuous sewage filtering operation is performed through a plurality of filters, so that the replacement or regeneration can be performed when the adsorption material in the filters is saturated.
Preferably, the step five advanced oxidation includes the steps of:
adding hydrogen peroxide solution into the equipment to serve as oxide according to the detected wastewater characteristics and the content of target pollutants;
the sewage in the equipment is oxidized again to generate hydroxyl free radicals under the action of ultraviolet irradiation and hydrogen peroxide, so that organic pollutants are degraded;
after the advanced oxidation treatment is completed, continuous ultraviolet light irradiation is carried out, the residual hydrogen peroxide in the water body is degraded to generate water and oxygen, and the generated oxygen is discharged through an exhaust device and stored for standby.
Preferably, the secondary biological treatment unit in the step six is a biological filter, and the biological filter adopts a filter bed and an activated sludge reflux system so as to increase the microorganism adhesion surface and maintain the concentration of the activated sludge.
Preferably, the step six of further removing the residual nitrogen includes the steps of:
utilizing oxygen generated in the advanced oxidation treatment by an aeration device to provide sufficient oxygen to support the growth of microorganisms and the removal of nitrogen;
nitrite is typically oxidized by nitrifying bacteria to nitrate, thereby removing ammonia nitrogen, while denitrifying bacteria perform a denitrification process of wastewater in which nitrate is reduced to nitrogen or other nitrogen compounds.
Preferably, the final treatment and disinfection of the water body in the seventh step comprises the following steps:
before final treatment, water quality monitoring is performed to ensure that the wastewater has reached a predetermined water quality standard;
the wastewater enters a final treatment unit, wherein particles and sediments can settle to the bottom, and clean water is separated and collected from the upper part;
adding proper amount of chlorine dioxide into the collected clean water to kill pathogens and microorganisms;
the treated water quality parameters are continuously monitored to ensure the effectiveness of the final treatment and disinfection process.
The invention provides a method for deeply denitrifying and dephosphorizing sewage. The beneficial effects are as follows:
1. the invention adds advanced oxidation treatment step, utilizes the cooperation of ultraviolet rays and hydrogen peroxide to further decompose the organic micro-pollutants containing nitrogen and phosphorus in the sewage, and decomposes the hydrogen peroxide by cooperating with the irradiation of the ultraviolet rays, thereby achieving the purposes of removing the micro-pollutants and not influencing the subsequent treatment of the sewage.
2. According to the invention, through the added secondary biological treatment step, the sewage after denitrification and dephosphorization is subjected to secondary treatment, the denitrification and dephosphorization effect is further improved, and the oxygen generated by decomposing hydrogen peroxide in the previous step is matched to provide sufficient oxygen supply for the secondary biological treatment, so that the nitrification and denitrification treatment are carried out, the resource is utilized to the greatest extent, and the method is more energy-saving and environment-friendly.
3. The invention reduces the sludge content in the treated water body through multi-level filtration adsorption, centrifugation and precipitation treatment.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
the embodiment of the invention provides a method for deeply denitrifying and dephosphorizing sewage, which comprises the following steps:
step one, primary treatment, namely removing large-particle solids from sewage through traditional primary treatment steps such as grating, precipitation and the like. The primary treatment steps include: the sewage firstly passes through a mechanical grating to remove sundries such as large-particle solids, leaves, paper and the like, and the grating spacing is adjustable according to the needs so as to adapt to solid particles with different particle diameters; the water flow treated by the grating enters a sedimentation tank, and suspended matters of smaller particles are removed through gravity sedimentation, so that the smaller particles are settled to the bottom to form sludge; oil and water separation is carried out by using an oil-water separator by utilizing the density difference of the oil and the water; and (3) neutralizing the pH value of the wastewater according to the characteristics of the wastewater so as to meet the requirements of subsequent treatment.
And step two, biological treatment, namely introducing the sewage subjected to primary treatment into a biological treatment unit, and removing organic matters and part of nitrogen through an activated sludge reactor. The activated sludge reactor comprises the following preparation steps: providing sufficient oxygen to support metabolic activity of bacteria and microorganisms using an aeration device; the uniform mixing of the microorganisms and the wastewater is maintained by the stirring device to ensure the uniformity of biological treatment. Wherein the activated sludge reactor for removing organic matter and nitrogen comprises the steps of: the microorganisms degrade organic matters, and the organic matters can be adsorbed and decomposed by the microorganisms, so that the chemical oxygen demand and the biochemical oxygen demand in the wastewater are reduced; in an oxygen-enriched environment, nitrite in the sewage is usually oxidized into nitrate by nitrifying bacteria in the active sewage, so that the aim of removing part of ammonia nitrogen is fulfilled; denitrifying bacteria in the activated sludge reactor can reduce nitrate in the sewage into nitrogen, and the nitrogen in the sewage is deeply removed.
And thirdly, performing physical and chemical flocculation, namely adding an environment-friendly chemical flocculation agent into the sewage treated in the second step, and performing flocculation treatment on the sewage. The flocculation treatment comprises the following steps: gradually adding the flocculating agent solution into the sewage subjected to biological treatment in a stoichiometric manner; ensuring that the flocculating agent is uniformly dispersed in the sewage by stirring equipment so as to promote interaction between particles in the sewage and the flocculating agent; introducing the sewage subjected to chemical flocculation treatment into a sedimentation tank so that larger flocculated bodies settle to the bottom; a part of clear water in the sedimentation tank flows back to the biological treatment unit through the stripping equipment so as to maintain the water quality and the microbial community in the biological treatment system. After flocculation, the reclaimed water is separated from the flocculated and sludge using a centrifuge.
And step four, filtering or adsorbing, and introducing the reclaimed water separated in the step three into a filter for filtering treatment. The filtering process comprises the following steps: when filtering, the sewage is pretreated, the pH value of the sewage is adjusted, and large-particle impurities are removed, so that the filter is prevented from being blocked or damaged; the continuous sewage filtering operation is performed through a plurality of filters, so that the replacement or regeneration can be performed when the adsorption material in the filters is saturated. To remove residual particulate matter, soluble organics and phosphorus and nitrogen in the wastewater.
And fifthly, advanced oxidation treatment, namely leading the reclaimed water filtered in the fourth step to storage equipment, and removing micro pollutants by using an advanced oxidation technology. Advanced oxidation includes the steps of: adding hydrogen peroxide solution into the equipment to serve as oxide according to the detected wastewater characteristics and the content of target pollutants; the sewage in the equipment is oxidized again to generate hydroxyl free radicals under the action of ultraviolet irradiation and hydrogen peroxide, so that organic pollutants are degraded; after the advanced oxidation treatment is completed, continuous ultraviolet light irradiation is carried out, the residual hydrogen peroxide in the water body is degraded to generate water and oxygen, and the generated oxygen is discharged through an exhaust device and stored for standby.
And step six, secondary biological treatment, wherein the water treated in the step five is introduced into a secondary biological treatment unit. The secondary biological treatment unit is a biological filter, and the biological filter adopts a filter bed and an activated sludge reflux system to increase microorganism adhesion surface and maintain the concentration of the activated sludge. Further removal of residual nitrogen is made. Utilizing oxygen generated in the advanced oxidation treatment by an aeration device to provide sufficient oxygen to support the growth of microorganisms and the removal of nitrogen; nitrite is typically oxidized by nitrifying bacteria to nitrate, thereby removing ammonia nitrogen, while denitrifying bacteria perform a denitrification process of wastewater in which nitrate is reduced to nitrogen or other nitrogen compounds.
And seventhly, final treatment and disinfection are carried out on the water body, so that the safety and qualified emission standard is ensured to be achieved. Before final treatment, water quality monitoring is performed to ensure that the wastewater has reached a predetermined water quality standard; the wastewater enters a final treatment unit, wherein particles and sediments can settle to the bottom, and clean water is separated and collected from the upper part; adding proper amount of chlorine dioxide into the collected clean water to kill pathogens and microorganisms; the treated water quality parameters are continuously monitored to ensure the effectiveness of the final treatment and disinfection process.
The sewage is subjected to deep denitrification and dephosphorization through the process steps, and the finally obtained micro-pollutant removal effect, denitrification and dephosphorization effect, sludge residual rate and resource utilization rate are shown in the following table one.
Embodiment two:
the embodiment of the invention provides a method for deeply removing nitrogen and phosphorus from sewage, which is characterized in that the fifth step in the first embodiment is removed, oxygen generated in advanced oxidation treatment in the sixth step is removed by using the fifth step through aeration equipment, the other steps are the same as those in the first embodiment, and the characterization is performed by adopting the same method, so that a micro pollutant removing effect, a nitrogen and phosphorus removing effect, a sludge residual rate and a resource utilization rate are finally obtained.
Embodiment III:
the embodiment of the invention provides a method for deep denitrification and dephosphorization of sewage, which is characterized in that the step six in the embodiment I is removed, the other steps are the same as those in the embodiment I, and the same method is adopted for characterization, so that the micro-pollutant removal effect, the denitrification and dephosphorization effect, the sludge residual rate and the resource utilization rate are finally obtained, and are shown in the following table I.
Embodiment four:
the embodiment of the invention provides a method for deeply removing nitrogen and phosphorus from sewage, which is characterized in that the fifth step and the sixth step in the first embodiment are removed, the other steps are the same as those in the first embodiment, and the same method is adopted to perform characterization, so that a micro-pollutant removing effect, a nitrogen and phosphorus removing effect, a sludge residual rate and a resource utilization rate are finally obtained, wherein the micro-pollutant removing effect, the nitrogen and phosphorus removing effect, the sludge residual rate and the resource utilization rate are shown in the following table one.
List one
Conclusion: as can be seen from the table one, by adding the advanced oxidation treatment step, the organic micropollutants containing nitrogen and phosphorus in the sewage are further decomposed by utilizing the combination of ultraviolet rays and hydrogen peroxide, and the hydrogen peroxide is decomposed by combining the irradiation of ultraviolet rays, so that the purposes of removing the micropollutants and not influencing the subsequent treatment of the sewage are achieved. Meanwhile, the sewage after denitrification and dephosphorization is subjected to secondary treatment through the added secondary biological treatment step, so that the denitrification and dephosphorization effect is further improved, and oxygen generated by decomposing hydrogen peroxide in the previous step is matched to provide sufficient oxygen supply for the secondary biological treatment, so that the nitrification and denitrification treatment are carried out, the resource is utilized to the greatest extent, and the method is more energy-saving and environment-friendly. And the sludge content in the treated water body is reduced through multi-level filtration adsorption, centrifugation and precipitation treatment.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The method for deeply denitrifying and dephosphorizing sewage is characterized by comprising the following steps:
step one, primary treatment, namely removing large-particle solids from sewage through the traditional primary treatment steps such as gratings, precipitation and the like;
step two, biological treatment, namely introducing the sewage subjected to primary treatment into a biological treatment unit, and removing organic matters and part of nitrogen through an activated sludge reactor;
thirdly, performing physical and chemical flocculation, namely adding an environment-friendly chemical flocculation agent into the sewage treated in the second step, performing flocculation treatment on the sewage, and separating reclaimed water from flocculated materials and sludge by using centrifugal equipment after flocculation;
step four, filtering or adsorbing, and introducing the reclaimed water separated in the step three into a filter for filtering treatment so as to remove residual particulate matters, soluble organic matters and phosphorus and nitrogen in the wastewater;
step five, advanced oxidation treatment, namely leading the reclaimed water filtered in the step four to storage equipment, and removing micro pollutants by using an advanced oxidation technology;
step six, secondary biological treatment, namely introducing the water treated in the step five into a secondary biological treatment unit to further remove residual nitrogen;
and seventhly, final treatment and disinfection are carried out on the water body, so that the safety and qualified emission standard is ensured to be achieved.
2. The method for deep denitrification and dephosphorization of sewage according to claim 1, wherein the primary treatment step in the first step comprises:
the sewage firstly passes through a mechanical grating to remove sundries such as large-particle solids, leaves, paper and the like, and the grating spacing is adjustable according to the needs so as to adapt to solid particles with different particle diameters;
the water flow treated by the grating enters a sedimentation tank, and suspended matters of smaller particles are removed through gravity sedimentation, so that the smaller particles are settled to the bottom to form sludge;
oil and water separation is carried out by using an oil-water separator by utilizing the density difference of the oil and the water;
and (3) neutralizing the pH value of the wastewater according to the characteristics of the wastewater so as to meet the requirements of subsequent treatment.
3. The method for deep denitrification and dephosphorization of sewage according to claim 1, wherein the activated sludge reactor in the second step comprises the following preparation steps:
providing sufficient oxygen to support metabolic activity of bacteria and microorganisms using an aeration device;
the uniform mixing of the microorganisms and the wastewater is maintained by the stirring device to ensure the uniformity of biological treatment.
4. The method for deep denitrification and dephosphorization of sewage according to claim 1, wherein the step two of removing organic matters and nitrogen by the activated sludge reactor comprises the following steps:
the microorganisms degrade organic matters, and the organic matters can be adsorbed and decomposed by the microorganisms, so that the chemical oxygen demand and the biochemical oxygen demand in the wastewater are reduced;
in an oxygen-enriched environment, nitrite in the sewage is usually oxidized into nitrate by nitrifying bacteria in the active sewage, so that the aim of removing part of ammonia nitrogen is fulfilled;
denitrifying bacteria in the activated sludge reactor can reduce nitrate in the sewage into nitrogen, and the nitrogen in the sewage is deeply removed.
5. The method for deep denitrification and dephosphorization of sewage according to claim 1, wherein the flocculation treatment in the third step comprises the following steps:
gradually adding the flocculating agent solution into the sewage subjected to biological treatment in a stoichiometric manner;
ensuring that the flocculating agent is uniformly dispersed in the sewage by stirring equipment so as to promote interaction between particles in the sewage and the flocculating agent;
introducing the sewage subjected to chemical flocculation treatment into a sedimentation tank so that larger flocculated bodies settle to the bottom;
a part of clear water in the sedimentation tank flows back to the biological treatment unit through the stripping equipment so as to maintain the water quality and the microbial community in the biological treatment system.
6. The method for deep denitrification and dephosphorization of sewage according to claim 1, wherein the filtering treatment in the fourth step comprises the following steps:
when filtering, the sewage is pretreated, the pH value of the sewage is adjusted, and large-particle impurities are removed, so that the filter is prevented from being blocked or damaged;
the continuous sewage filtering operation is performed through a plurality of filters, so that the replacement or regeneration can be performed when the adsorption material in the filters is saturated.
7. The method for deep denitrification and dephosphorization of sewage according to claim 1, wherein the advanced oxidation in the fifth step comprises the following steps:
adding hydrogen peroxide solution into the equipment to serve as oxide according to the detected wastewater characteristics and the content of target pollutants;
the sewage in the equipment is oxidized again to generate hydroxyl free radicals under the action of ultraviolet irradiation and hydrogen peroxide, so that organic pollutants are degraded;
after the advanced oxidation treatment is completed, continuous ultraviolet light irradiation is carried out, the residual hydrogen peroxide in the water body is degraded to generate water and oxygen, and the generated oxygen is discharged through an exhaust device and stored for standby.
8. The method for deep denitrification and dephosphorization of sewage according to claim 1, wherein the secondary biological treatment unit in the sixth step is a biological filter, and the biological filter adopts a filter bed and a reflux system of activated sludge to increase microorganism adhesion surface and maintain concentration of the activated sludge.
9. The method for deep denitrification and dephosphorization of sewage according to claim 1, wherein the step six of further removing residual nitrogen comprises the steps of:
utilizing oxygen generated in the advanced oxidation treatment by an aeration device to provide sufficient oxygen to support the growth of microorganisms and the removal of nitrogen;
nitrite is typically oxidized by nitrifying bacteria to nitrate, thereby removing ammonia nitrogen, while denitrifying bacteria perform a denitrification process of wastewater in which nitrate is reduced to nitrogen or other nitrogen compounds.
10. The method for deep denitrification and dephosphorization of sewage according to claim 1, wherein the final treatment and disinfection of the water in the seventh step comprises the following steps:
before final treatment, water quality monitoring is performed to ensure that the wastewater has reached a predetermined water quality standard;
the wastewater enters a final treatment unit, wherein particles and sediments can settle to the bottom, and clean water is separated and collected from the upper part;
adding proper amount of chlorine dioxide into the collected clean water to kill pathogens and microorganisms;
the treated water quality parameters are continuously monitored to ensure the effectiveness of the final treatment and disinfection process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311421004.2A CN117417074A (en) | 2023-10-30 | 2023-10-30 | Method for deep denitrification and dephosphorization of sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311421004.2A CN117417074A (en) | 2023-10-30 | 2023-10-30 | Method for deep denitrification and dephosphorization of sewage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117417074A true CN117417074A (en) | 2024-01-19 |
Family
ID=89524364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311421004.2A Pending CN117417074A (en) | 2023-10-30 | 2023-10-30 | Method for deep denitrification and dephosphorization of sewage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117417074A (en) |
-
2023
- 2023-10-30 CN CN202311421004.2A patent/CN117417074A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105585220B (en) | A kind of urban sewage treatment system and purification method | |
| KR100784933B1 (en) | Apparatus for treating organic matter and nitrogen of high density organic wastewater | |
| KR100906742B1 (en) | Treatment method and the apparatus including ultasonic-electrolysis-precipitator and complexed upper filter isolator for domestic sewage or wasted water | |
| US9409807B2 (en) | Use of primary sludge for carbon source in an aerated-anoxic bioreactor system | |
| JP2007029826A (en) | Apparatus for treating waste water and method for treating waste water using the apparatus | |
| KR100446041B1 (en) | Industrial wastewater reusing system using combination biofilter process, AC/ACF/Sand filter process and advanced oxidation process | |
| KR100422211B1 (en) | Management Unit and Method of Foul and Waste Water | |
| CN208136047U (en) | A kind of coking wastewater processing system | |
| KR20170014568A (en) | Methods for electronic wastewater treatment at an ultra-low concentration of contaminants adapting microfiltration membrane bioreactor process and selective heavy metal removal process | |
| CN111847764A (en) | Method for treating printing and dyeing wastewater based on catalytic oxidation of ozone | |
| KR101594822B1 (en) | The method and processing apparatus of the floating fish cage sludge using biological activated carbon | |
| KR100882802B1 (en) | Biological treating and filtering system for wastewater and the method of recycling the wastewater | |
| CN109133506A (en) | A kind of depth sewage treatment process | |
| CN1931750B (en) | Petrochemical effluent treating and reusing process | |
| KR0126883Y1 (en) | Facilities for treating waste water on a large scale | |
| RU2336232C2 (en) | Method of biological sewage water purification and silt sediment utilisation | |
| CN117417074A (en) | Method for deep denitrification and dephosphorization of sewage | |
| KR101021868B1 (en) | Advanced method of treating waste water using electromagnetic waves and ultrasonic waves | |
| CN114409207A (en) | Printing ink effluent disposal system | |
| CN211445406U (en) | Landfill leachate treatment device | |
| KR100583904B1 (en) | High intergated Biological Nutrient Removal System | |
| KR101054613B1 (en) | Apparatus for waste water single reactor composed of biological and membrane process | |
| CN216639205U (en) | Industrial sewage treatment system | |
| CN215924716U (en) | Ethyl acetate effluent disposal system | |
| JP2005186047A (en) | Method for cleaning arsenic-containing raw water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |