CN115650428A - Deep dephosphorization and denitrification method for tail water of sewage treatment plant - Google Patents
Deep dephosphorization and denitrification method for tail water of sewage treatment plant Download PDFInfo
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- CN115650428A CN115650428A CN202211503436.3A CN202211503436A CN115650428A CN 115650428 A CN115650428 A CN 115650428A CN 202211503436 A CN202211503436 A CN 202211503436A CN 115650428 A CN115650428 A CN 115650428A
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Abstract
The invention relates to a method for deep dephosphorization and denitrification of tail water of a sewage treatment plant, which adopts a composite dephosphorization ball to carry out oxygen elimination and dephosphorization on incoming water and adopts a composite denitrification biological ball to carry out denitrification, wherein lime and steel slag can effectively regulate the pH value of the water and strengthen the dephosphorization, the stable dephosphorization of the composite dephosphorization ball is ensured through intermittent air washing without additional regeneration, the contact effect of the composite denitrification biological ball and the water is kept and part of electron donors are provided through flushing of waste gas collected by an air or front-end sewage plant treatment unit, the air washing mode promotes the elimination of impurities and avoids the hardening problem, the oxygen elimination and the denitrification are separated in a targeted way through partition treatment, the retention time of a filter tank is reduced, the removal efficiency of nitrate nitrogen is improved, and the removal effect of total phosphorus is also improved through two-stage treatment.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a method for deep dephosphorization and denitrification of tail water of a sewage treatment plant.
Background
Rivers and lakes play an important role in conserving water sources, discharging floods, storing stagnant water, building water landscape, water culture and the like. The tail water of a sewage treatment plant is one of main supplementary water sources of river and lake water bodies in cities. Under the influence of environmental conditions such as hydrology, geology, illumination and the like, a river channel which takes tail water of a sewage plant as main make-up water may cause eutrophication of a water body due to inflow of a large amount of nitrogen and phosphorus, so that water bloom is burst, and the ecological environment of the water body is damaged. The effluent discharge of most domestic sewage treatment plants implements the primary A standard of GB18918-2002 standard, but still has a longer difference with the related index limit value of the surface water quality standard, and particularly, the total phosphorus and the total nitrogen influence two key factors of water eutrophication. In recent years, with the increase of the control of surface water environmental quality in China, the discharge standards of sewage from places which are continuously discharged from all over the country and the new assessment requirements of river and lake sections are formulated, more strict discharge requirements are put forward for TP and TN indexes, and the requirements of further deep nitrogen and phosphorus removal of tail water of municipal sewage treatment plants are increasing day by day. The tail water discharged by sewage plant treatment still contains relatively high nitrogen and phosphorus, and the C/N is low, so that the problems that a large amount of carbon sources are consumed by using the traditional denitrification advanced nitrogen removal technology, and the operation cost of advanced phosphorus removal by using the direct chemical agent phosphorus removal technology is high exist.
The sulfur autotrophic denitrification denitrogenation technology uses low-valence sulfur as an electron donor to replace a carbon source, and realizes denitrification through autotrophic denitrifying bacteria. It has the advantages of saving carbon source, low sludge yield, etc. and is widely used. While the filler system containing metal elements such as aluminum, iron, calcium and the like can usually remove phosphorus through physical and chemical adsorption, or Al generated by electrochemical corrosion and/or biochemical corrosion 3+ 、Fe 2+ 、Fe 3+ 、Ca 2+ And the phosphate in the water is subjected to precipitation reaction to remove phosphorus.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
In order to solve the problems that the sewage in the prior art still contains relatively high nitrogen and phosphorus after treatment, has low C/N, needs to consume a large amount of carbon sources, has high operation cost and the like, the invention provides the method for deep dephosphorization and denitrification of the tail water of the sewage treatment plant.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for deep dephosphorization and denitrification of tail water of a sewage treatment plant comprises the following steps:
(1) Enabling tail water of a sewage treatment plant to flow into a first treatment area from top to bottom for oxygen and phosphorus elimination treatment;
(2) The sewage after oxygen and phosphorus elimination treatment flows into the second treatment area from the lower end of the first treatment area, and flows out from the upper end of the second treatment area after denitrification and enhanced phosphorus removal treatment to obtain phosphorus and nitrogen removal water.
Further, one or more vent pipes are arranged at the bottom of the first treatment area and the bottom of the second treatment area.
The bottom of the first treatment area and the bottom of the second treatment area can be intermittently filled with gas, the gas can ensure stable phosphorus removal of the composite phosphorus removal ball, additional regeneration is not needed, the contact effect of the composite denitrification biological ball and water is kept, and part of electron donors are provided.
Further, air is introduced into the first treatment area through a vent pipe, and air or waste gas collected by a treatment unit of a front-end sewage plant is introduced into the second treatment area through the vent pipe;
the waste gas collected by the front-end sewage plant treatment unit is the waste gas collected by a self-regulation pool, a hydrolysis acidification pool or an anaerobic pool.
The waste gas collected by the front-end sewage plant treatment unit is pressurized and stored by a steel gas storage tank, and the main components of the waste gas comprise hydrogen sulfide, carbon dioxide, methane and the like.
Furthermore, the first treatment area and the second treatment area are separated by a partition plate, and a communication hole for allowing water in the first treatment area to flow into the second treatment area is formed in the lower end of the partition plate.
Furthermore, the first treatment area is filled with composite dephosphorization balls, and the second treatment area is filled with composite denitrification biological balls.
Furthermore, the composite dephosphorization ball consists of a shell and dephosphorization filler particles arranged in the shell, wherein the shell is in a spherical shape with the diameter of 80-150mm, and the surface of the shell is in a grid structure.
Further, the shell is made of polyethylene, and the phosphorus removal filler particles are composed of phosphorus removal iron fillers and activated carbon particles according to the volume ratio of 3-10;
the dephosphorized iron filler is one or more of sponge iron, scrap iron or iron-carbon filler;
the particle size of the iron phosphate removing filler is 8-30mm, and the particle size of the activated carbon particles is 3-5mm;
the activated carbon particles are wrapped by a 10-20 mesh polyethylene gauze.
Furthermore, the composite denitrification biological ball consists of a shell and denitrification filler particles arranged in the shell, wherein the shell is in a spherical shape with the diameter of 80-150mm, and the surface of the shell is in a grid structure.
Further, the shell is made of polyethylene, and the denitrification filler particles are composed of a sulfur-based material, limestone, steel slag, polyurethane and a solid slow-release carbon source;
wherein, according to the volume percentage, the sulfur-based material is 25-30%, the limestone is 2-10%, the steel slag is 1-5%, the biological adhesive filler is 50-65%, and the solid slow-release carbon source is 1-5%;
the sulfur-based material is sulfur or pyrite, the particle size of the sulfur-based material is 3-30mm, the particle size of limestone is 3-10mm, the particle size of steel slag is 5-10mm, and the biological adhesion filler is a cube of 10 multiplied by 10 mm;
the solid slow-release carbon source is alkali-soaked sawdust, wood blocks, corncobs or straws;
the biological adhesive filler is volcanic rock, polyurethane or ceramsite;
the denitrification filler particles are wrapped by a 10-20 mesh polyethylene gauze.
Furthermore, the effective volume ratio of the first treatment area to the second treatment area is 1:2-4, the residence time of the sewage in the first treatment area is 20-30min, and the residence time of the sewage in the second treatment area is 30-90min.
A common tail water deep biological nitrogen and phosphorus removal system usually needs to add a large amount of carbon sources and phosphorus removal agents and needs a certain hydraulic retention time; the conventional sulfur autotrophic nitrogen removal system has the defects that the pH fluctuation is large, the alkalinity needs to be supplemented, the phosphorus removal capability is poor or almost no phosphorus removal capability exists; the phosphorus removal of the iron-carbon microelectrolysis system is easy to harden or passivated due to the attachment of sediments on the surface, so that the effect is poor; the adsorption filler needs to be regenerated after the phosphorus removal reaches the adsorption saturation, and the phosphorus removal effect is limited.
Compared with the prior art, the invention has the beneficial effects that:
according to the method, the composite phosphorus removal balls are adopted to carry out oxygen elimination and phosphorus removal on the incoming water, and the composite nitrogen removal biological balls are adopted to carry out nitrogen removal, wherein lime and steel slag can effectively adjust the pH value of the water and reinforce the phosphorus removal, the stable phosphorus removal of the composite phosphorus removal balls is ensured through intermittent air washing, no additional regeneration is needed, the contact effect of the composite nitrogen removal biological balls and the water is kept and part of electron donors are provided through washing by air or waste gas collected by a treatment unit of a front-end sewage plant, the air washing mode promotes the removal of impurities, the hardening problem is avoided, the oxygen elimination and phosphorus removal and the denitrification are separated in a targeted manner through partition treatment, the retention time of a filter pool is reduced, the nitrate nitrogen removal efficiency is improved, and the removal effect of total phosphorus is also improved through two-stage treatment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the process for deep dephosphorization and denitrification of tail water of a sewage treatment plant according to the invention;
FIG. 2 shows COD of raw water, effluent from the first treatment zone and effluent from the second treatment zone in different batches during the treatment by the method of example 1 of the present invention Cr A variation graph;
FIG. 3 is a graph showing the TP changes of raw water, effluent from the first treatment zone and effluent from the second treatment zone in different batches during the treatment process according to the method of example 1 of the present invention;
FIG. 4 is a TN change chart of raw water, effluent of the first treatment zone and effluent of the second treatment zone in different batches during treatment by the method of example 1 of the present invention;
reference numerals
1-a first treatment area, 2-a second treatment area, 3-a water inlet, 4-a water outlet, 5-a vent pipe, 6-a communication hole and 7-a clapboard.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 shows a flow chart of the process for deep dephosphorization and denitrification of tail water from a sewage treatment plant according to the present invention.
Example 1
The method for deep dephosphorization and denitrification of tail water of a sewage treatment plant comprises the following steps:
(1) Tail water of a sewage treatment plant flows into a first treatment area 1 from top to bottom through a water inlet 3 to carry out oxygen elimination and phosphorus removal treatment, a composite phosphorus removal ball is filled in the first treatment area 1, the composite phosphorus removal ball consists of a shell and phosphorus removal filler particles arranged in the shell, the shell is spherical with the diameter of 120mm, and the surface of the shell is of a grid structure;
the shell is made of polyethylene, the dephosphorization filler particles consist of sponge iron and activated carbon particles according to a volume ratio of 5:1, the particle size of the sponge iron is 8-12mm, the particle size of the activated carbon particles is 3-5mm, and the activated carbon particles are wrapped by a 20-mesh polyethylene gauze;
(2) Sewage after oxygen and phosphorus elimination treatment flows into the second treatment area 2 from a communicating hole 6 at the lower end of the first treatment area 1, and flows out from a water outlet 4 at the upper end of the second treatment area 2 after denitrification and enhanced phosphorus removal treatment to obtain phosphorus and nitrogen removal water;
the second treatment area 2 is filled with composite denitrification biological balls, the composite denitrification biological balls are composed of a shell and denitrification filler particles arranged in the shell, the shell is spherical with the diameter of 120mm, and the surface of the shell is of a grid structure;
the shell is made of polyethylene, and the denitrification filler particles are composed of the following raw materials, by volume, 30% of sulfur, 10% of limestone, 3% of steel slag, 55% of polyurethane and 2% of alkali-foamed wood chips; the denitrification filler particles are wrapped by a 20-mesh polyethylene gauze, the particle size of the sulfur ore is 3-5mm, the particle size of the limestone is 3-5mm, the particle size of the steel slag is 6-8mm, and the polyurethane is a cube of 10 multiplied by 10 mm;
wherein, the bottom of first treatment area 1 and the bottom of second treatment area 2 all are provided with breather pipe 5, and the air lets in first treatment area 1 through breather pipe 5, and the waste gas that front end sewage plant processing unit collected lets in second treatment area 2 through breather pipe 5, the waste gas that front end sewage plant processing unit collected for hydrolysis-acidification pool waste gas intermittent type gas washing, waste gas principal ingredients hydrogen sulfide, carbon dioxide, methane etc.. The first treatment area 1 and the second treatment area 2 are separated by a partition plate 7, and the lower end of the partition plate 7 is provided with a communication hole 6 for water in the first treatment area 1 to flow into the second treatment area 2;
the effective volume ratio of the first treatment area 1 to the second treatment area 2 is 1:2-4, the residence time of sewage in the first treatment area 1 is 30min, the residence time of sewage in the second treatment area 2 is 60min, intermittent air washing is carried out in the first treatment area, and intermittent air washing is carried out on the waste gas of the hydrolysis acidification tank in the second treatment area 2.
Secondary biochemical effluent (COD) of sewage plant treated by the method of the invention Cr TP, TN, etc. concentration indexes of about 40-60 mg/L, 0.2-0.8 mg/L, 10-17 mg/L), treated by the test device of the embodiment, COD Cr Can be reduced to below 30mg/L, TP can be reduced to below 0.1mg/L, even below 0.05mg/L, and total nitrogen can be reduced to below about 5.0 mg/L.
The treatment method of the embodiment is adopted to carry out multi-batch treatment on sewage, raw water, effluent of the first treatment area and effluent of the second treatment area in different batches are taken to carry out water quality detection, and water quality index data are shown in figures 2-4.
Example 2
The method for deep dephosphorization and denitrification of tail water of a sewage treatment plant comprises the following steps:
(1) Tail water of a sewage treatment plant flows into a first treatment area 1 from top to bottom through a water inlet 3 to carry out oxygen elimination and phosphorus removal treatment, composite phosphorus removal balls are filled in the first treatment area 1, each composite phosphorus removal ball consists of a shell and phosphorus removal filler particles arranged in the shell, the shell is spherical with the diameter of 80mm, and the surface of the shell is of a grid structure;
the shell is made of polyethylene, the dephosphorization filler particles consist of sponge iron and activated carbon particles according to a volume ratio of 3:1, the particle size of the sponge iron is 18-20mm, the particle size of the activated carbon particles is 3-5mm, and the activated carbon particles are wrapped by a 10-mesh polyethylene gauze;
(2) Sewage after oxygen and phosphorus elimination treatment flows into the second treatment area 2 from a communicating hole 6 at the lower end of the first treatment area 1, and flows out from a water outlet 4 at the upper end of the second treatment area 2 after denitrification and enhanced phosphorus removal treatment to obtain phosphorus and nitrogen removal water;
the second treatment area 2 is filled with composite denitrification biological balls, the composite denitrification biological balls are composed of a shell and denitrification filler particles arranged in the shell, the shell is in a spherical shape with the diameter of 80mm, and the surface of the shell is in a grid structure;
the shell is made of polyethylene, and the denitrification filler particles are composed of raw materials of, by volume, 25% of sulfur, 8% of limestone, 1% of steel slag, 65% of volcanic rock and 1% of alkali-soaked corncobs; the denitrification filler particles are wrapped by a 10-mesh polyethylene gauze, the particle size of the sulfur ore is 10-15mm, the particle size of the limestone is 8-10mm, the particle size of the steel slag is 8-10mm, and the volcanic rock is a cube of 10 multiplied by 10 mm;
wherein, the bottom of first treatment area 1 and the bottom of second treatment area 2 all are provided with breather pipe 5, and the air lets in first treatment area 1 through breather pipe 5, and the waste gas that front end sewage plant processing unit collected lets in second treatment area 2 through breather pipe 5, the waste gas that front end sewage plant processing unit collected for hydrolysis-acidification pool waste gas intermittent type gas washing, waste gas principal ingredients hydrogen sulfide, carbon dioxide, methane etc.. The first treatment area 1 and the second treatment area 2 are separated by a partition plate 7, and the lower end of the partition plate 7 is provided with a communication hole 6 for water in the first treatment area 1 to flow into the second treatment area 2;
the effective volume ratio of the first treatment area 1 to the second treatment area 2 is 1:2-4, the residence time of sewage in the first treatment area 1 is 25min, the residence time of sewage in the second treatment area 2 is 90min, intermittent air washing is carried out in the first treatment area, and intermittent air washing is carried out on the waste gas of the hydrolysis acidification tank in the second treatment area 2.
Example 3
The method for deep dephosphorization and denitrification of tail water of a sewage treatment plant comprises the following steps:
(1) Tail water of a sewage treatment plant flows into a first treatment area 1 from top to bottom through a water inlet 3 to carry out oxygen elimination and phosphorus removal treatment, a composite phosphorus removal ball is filled in the first treatment area 1, the composite phosphorus removal ball consists of a shell and phosphorus removal filler particles arranged in the shell, the shell is spherical with the diameter of 150mm, and the surface of the shell is of a grid structure;
the shell is made of polyethylene, the dephosphorization filler particles are composed of scrap iron and activated carbon particles according to a volume ratio of 10;
(2) Sewage after oxygen and phosphorus elimination treatment flows into the second treatment area 2 from a communicating hole 6 at the lower end of the first treatment area 1, and flows out from a water outlet 4 at the upper end of the second treatment area 2 after denitrification and enhanced phosphorus removal treatment to obtain phosphorus and nitrogen removal water;
the second treatment area 2 is filled with composite denitrification biological balls, the composite denitrification biological balls are composed of a shell and denitrification filler particles arranged in the shell, the shell is spherical with the diameter of 150mm, and the surface of the shell is of a grid structure;
the shell is made of polyethylene, and the denitrification filler particles are composed of the following raw materials by volume, 27% of sulfur, 2% of limestone, 5% of steel slag, 61% of polyurethane and 5% of alkali foam wood chips; the denitrification filler particles are wrapped by a 10-mesh polyethylene gauze, the particle size of the sulfur ore is 3-5mm, the particle size of the limestone is 3-5mm, the particle size of the steel slag is 6-8mm, and the polyurethane is a cube of 10 multiplied by 10 mm;
wherein, the bottom of first treatment area 1 and the bottom of second treatment area 2 all are provided with breather pipe 5, and the air lets in first treatment area 1 through breather pipe 5, and the waste gas that front end sewage plant processing unit collected lets in second treatment area 2 through breather pipe 5, the waste gas that front end sewage plant processing unit collected for hydrolysis acidification pool waste gas intermittent type gas washing, waste gas principal ingredients hydrogen sulfide, carbon dioxide, methane etc.. The first treatment area 1 and the second treatment area 2 are separated by a partition plate 7, and the lower end of the partition plate 7 is provided with a communication hole 6 for water in the first treatment area 1 to flow into the second treatment area 2;
the effective volume ratio of the first treatment area 1 to the second treatment area 2 is 1:2-4, the residence time of sewage in the first treatment area 1 is 20min, the residence time of sewage in the second treatment area 2 is 30min, intermittent air washing is carried out in the first treatment area, and intermittent air washing is carried out on the waste gas of the hydrolysis acidification tank in the second treatment area 2.
The inventor also examined the water quality index data of the effluent of the first treatment zone and the effluent of the second treatment zone in the treatment processes of examples 2 and 3 as in example 1, and the results are basically consistent, and are not listed again due to space limitation.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for deep dephosphorization and denitrification of tail water of a sewage treatment plant is characterized by comprising the following steps:
(1) Enabling tail water of a sewage treatment plant to flow into a first treatment area from top to bottom for oxygen and phosphorus elimination treatment;
(2) And sewage subjected to oxygen and phosphorus elimination treatment flows into the second treatment area from the lower end of the first treatment area, and flows out from the upper end of the second treatment area after denitrification and enhanced phosphorus removal treatment to obtain phosphorus and nitrogen removal water.
2. The method of claim 1, wherein one or more snorkels are disposed at the bottom of the first treatment zone and at the bottom of the second treatment zone.
3. The method of claim 2, wherein air is introduced into the first treatment zone through a snorkel, and air or exhaust gas collected by a treatment unit of a front end wastewater treatment plant is introduced into the second treatment zone through a snorkel;
the waste gas collected by the front-end sewage plant treatment unit is the waste gas collected by a self-regulation pool, a hydrolysis acidification pool or an anaerobic pool.
4. The method as claimed in claim 1, wherein the first treatment zone and the second treatment zone are separated by a partition plate, and the lower end of the partition plate is provided with a communication hole for water in the first treatment zone to flow into the second treatment zone.
5. The method as claimed in claim 1, wherein the first treatment zone is filled with composite dephosphorizing pellets, and the second treatment zone is filled with composite denitrifying biological pellets.
6. The method as claimed in claim 5, wherein the composite dephosphorizing bead is composed of a shell and dephosphorizing filler particles arranged inside the shell, the shell is spherical with a diameter of 80-150mm, and the surface of the shell is of a grid structure.
7. The method for deep dephosphorization and denitrification of tail water of a sewage treatment plant according to claim 6, wherein the shell is made of polyethylene, and the dephosphorization filler particles are composed of a dephosphorization iron filler and activated carbon particles according to a volume ratio of 3-10;
the iron phosphate removing filler is one or more of sponge iron, scrap iron or iron carbon filler;
the particle size of the iron phosphate removing filler is 8-30mm, and the particle size of the activated carbon particles is 3-5mm;
the activated carbon particles are wrapped by a 10-20 mesh polyethylene gauze.
8. The method as claimed in claim 5, wherein the composite denitrification bio-sphere is composed of a shell and denitrification filler particles arranged in the shell, the shell is a spherical shape with a diameter of 80-150mm, and the surface of the shell is of a grid structure.
9. The method of claim 8, wherein the shell is made of polyethylene, and the denitrification filler particles are composed of sulfur-based materials, limestone, steel slag, polyurethane and solid slow-release carbon sources;
wherein, according to the volume percentage, the sulfur-based material is 25-30%, the limestone is 2-10%, the steel slag is 1-5%, the biological adhesive filler is 50-65%, and the solid slow-release carbon source is 1-5%;
the sulfur-based material is sulfur or pyrite, the particle size of the sulfur-based material is 3-30mm, the particle size of the limestone is 3-10mm, the particle size of the steel slag is 5-10mm, and the biological attachment filler is a cube of 10 multiplied by 10 mm;
the solid slow-release carbon source is alkali-soaked sawdust, wood blocks, corncobs or straws;
the biological adhesive filler is volcanic rock, polyurethane or ceramsite;
the denitrification filler particles are wrapped by a 10-20 mesh polyethylene gauze.
10. The method as claimed in any one of claims 1 to 9, wherein the effective volume ratio of the first treatment zone to the second treatment zone is 1:2-4, the residence time of the sewage in the first treatment zone is 20-30min, and the residence time of the sewage in the second treatment zone is 30-90min.
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| CN117466432A (en) * | 2023-09-18 | 2024-01-30 | 北京科净源科技股份有限公司 | Preparation method of coupling autotrophic denitrification rapid-separation denitrification ball |
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| CN104891729A (en) * | 2015-04-30 | 2015-09-09 | 江苏大学 | Sewage plant tail water advanced treatment apparatus and technology thereof |
| CN106517649A (en) * | 2016-11-14 | 2017-03-22 | 江南大学 | Sewage deep dentrification and dephosphorization method |
| CN106630410A (en) * | 2016-12-14 | 2017-05-10 | 江南大学 | Sewage nitrogen and phosphorus removal device and application thereof |
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