CN115650428B - 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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Abstract
The invention relates to a deep dephosphorization and denitrification method for tail water of a sewage treatment plant, which adopts a composite dephosphorization ball to remove oxygen and phosphorus from the incoming water and adopts a composite denitrification biological ball to denitrify, wherein lime and steel slag can effectively adjust pH of the water and strengthen dephosphorization, stable dephosphorization of the composite dephosphorization ball is ensured by intermittent air washing without additional regeneration, the contact effect of the composite denitrification biological ball and the water is maintained and partial electron donor is provided by air or waste gas washing collected by a front-end sewage treatment plant treatment unit, the impurity removal is promoted by an air washing mode, the hardening problem is avoided, the oxygen and phosphorus removal and denitrification are separated in a targeted way by partition treatment, the retention time of a filter tank is reduced, the nitrate nitrogen removal efficiency is improved, and the total phosphorus removal effect is also improved by 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
The river and the lake have important functions in water conservation, flood drainage, water storage, water landscape, hydrologic construction and the like. The tail water of the sewage treatment plant is one of main supplementary water sources of water bodies of rivers and lakes in cities. Under the influence of environmental conditions such as hydrology, geology, illumination, etc., river courses taking tail water of sewage plants as main makeup water can cause water eutrophication due to inflow of a large amount of nitrogen and phosphorus, so that water bloom is exploded and ecological environment of the water is destroyed. The effluent discharge of most domestic sewage treatment plants implements the first-level A standard of GB18918-2002 standard, but the standard is still far away from the relevant index limit value of the surface water quality standard, and particularly, two key factors of total phosphorus and total nitrogen affecting the eutrophication of water bodies. In recent years, along with the increase of the management and control of the quality of the surface water environment in China, the wastewater discharge standard of places where wastewater is continuously discharged and the new river and lake section examination requirements are formulated in China, stricter discharge requirements are put forward on TP and TN indexes, and the requirements of further advanced denitrification and dephosphorization of tail water of urban wastewater treatment plants are increasingly increased. The tail water discharged from sewage treatment plants still contains relatively high nitrogen and phosphorus, and has low C/N, so that the problems that a large amount of carbon sources are required to be consumed by using the traditional denitrification deep denitrification technology, and the deep dephosphorization operation cost of the direct chemical agent dephosphorization technology is high are solved.
The sulfur autotrophic denitrification technology uses low-valence sulfur to replace carbon source as electron donor, and realizes denitrification by autotrophic denitrifying bacteria. It has the advantages of saving carbon source, low sludge yield and the like, and is widely used. The filler system containing metal elements such as aluminum, iron, calcium and the like can 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 water is precipitated to remove phosphorus.
The present invention has been made in view of the above-mentioned circumstances.
Disclosure of Invention
In order to solve the problems that sewage in the prior art still contains relatively higher nitrogen and phosphorus after being treated, has lower C/N, needs to consume a large amount of carbon sources, has high operation cost and the like, the invention provides a method for deeply dephosphorizing and denitrifying tail water of a sewage treatment plant.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for deep dephosphorization and denitrification of tail water of a sewage treatment plant, comprising the following steps:
(1) Flowing tail water of a sewage treatment plant into a first treatment area from top to bottom for oxygen and phosphorus removal treatment;
(2) The sewage after the oxygen and phosphorus removal 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 the 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 bottoms of the first treatment area and the second treatment area can be intermittently filled with gas, the gas can ensure that the composite dephosphorization balls stably remove phosphorus, regeneration is not needed, the contact effect of the composite denitrification bio-balls and water is maintained, and partial electron donors are provided.
Further, air is introduced into the first treatment area through the vent pipe, and air or waste gas collected by the front-end sewage treatment unit is introduced into the second treatment area through the vent pipe;
the waste gas collected by the front-end sewage plant treatment unit is waste gas collected by a self-adjusting tank, a hydrolytic acidification tank or an anaerobic tank.
The waste gas collected by the front-end sewage treatment unit is pressurized and stored by a steel gas storage tank, and the main components of the waste gas are hydrogen sulfide, carbon dioxide, methane and the like.
Further, the first treatment area and the second treatment area are separated by a partition, 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.
Further, the first treatment area is filled with composite dephosphorization balls, and the second treatment area is filled with composite denitrification biological balls.
Further, 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 dephosphorization filler particles consist of dephosphorization iron filler and active carbon particles according to the volume ratio of 3-10:1;
the dephosphorization iron filler is one or more of sponge iron, scrap iron or iron-carbon filler;
the particle size of the dephosphorizing iron filler is 8-30mm, and the particle size of the activated carbon particles is 3-5mm;
the active carbon particles are wrapped by 10-20 mesh polyethylene gauze.
Further, the composite denitrification biological ball consists of a shell and denitrification filler particles arranged in the shell, wherein the shell is spherical with the diameter of 80-150mm, and the surface of the shell is of a grid structure.
Further, the shell is made of polyethylene, and the denitrification filler particles consist of sulfur-based materials, 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 adhesion 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 wood chips, wood blocks, corncobs or straws;
the biological adhesion filler is volcanic rock, polyurethane or ceramsite;
the denitrification filler particles are wrapped by 10-20 mesh polyethylene gauze.
Further, 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.
In a general tail water deep biological nitrogen and phosphorus removal system, a large amount of carbon sources and phosphorus removal agents are often required to be added, and a certain hydraulic retention time is required; the conventional sulfur autotrophic nitrogen removal system has large pH fluctuation, needs to supplement alkalinity, and has poor or almost no phosphorus removal capability; the iron-carbon micro-electrolysis system is easy to harden after dephosphorization or passivate due to sediment attached to the surface, so that the effect is poor; the adsorption filler needs to be regenerated after reaching adsorption saturation, and the dephosphorization effect is limited.
Compared with the prior art, the invention has the beneficial effects that:
the method adopts the composite dephosphorization ball to remove oxygen and phosphorus from incoming water, adopts the composite denitrification biological ball to remove nitrogen, wherein lime and steel slag can effectively regulate pH of water and strengthen dephosphorization, ensures stable dephosphorization of the composite dephosphorization ball through intermittent air washing without additional regeneration, and maintains the contact effect of the composite denitrification biological ball and water and provides partial electron donor through washing waste gas collected by an air or front-end sewage treatment plant treatment unit, thereby promoting impurity removal in an air washing mode, avoiding hardening problem, separating the oxygen and phosphorus removal and denitrification nitrogen pertinently through partition treatment, reducing the retention time of a filter tank, improving nitrate nitrogen removal efficiency, and improving total phosphorus removal effect through two-stage treatment.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a process flow diagram 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 treatment by the method of example 1 of the present invention Cr A variation map;
FIG. 3 is a graph showing TP changes of raw water, effluent from a first treatment area and effluent from a second treatment area in different batches during treatment by the method of example 1 of the present invention;
FIG. 4 is a graph showing TN changes of raw water, effluent from the first treatment zone and effluent from 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 partition plate.
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 will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
Fig. 1 shows a process flow chart for deep dephosphorization and denitrification of tail water of a sewage treatment plant.
Example 1
The method for deep dephosphorization and denitrification of tail water of a sewage treatment plant in the embodiment comprises the following steps:
(1) Flowing tail water of a sewage treatment plant into a first treatment area 1 from top to bottom through a water inlet 3 for oxygen elimination and phosphorus removal treatment, wherein the first treatment area 1 is filled with composite phosphorus removal balls, the composite phosphorus removal balls consist of a shell and phosphorus removal filler particles arranged in the shell, the shell is in a spherical shape with the diameter of 120mm, and the surface of the shell is in a grid structure;
the shell is made of polyethylene, the dephosphorization filler particles are composed of sponge iron and active 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 active carbon particles is 3-5mm, and the active carbon particles are wrapped by 20-mesh polyethylene gauze;
(2) The sewage after the oxygen and phosphorus removal treatment flows into the second treatment area 2 from the communication hole 6 at the lower end of the first treatment area 1, and flows out from the 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 consist of a shell and denitrification filler particles arranged in the shell, the shell is in a spherical shape with the diameter of 120mm, and the surface of the shell is in a grid structure;
the shell is made of polyethylene, the denitrification filler particles are composed of the following raw materials in percentage by volume, namely 30% of sulfur, 10% of limestone, 3% of steel slag, 55% of polyurethane and 2% of alkali-foamed wood dust; the denitrification filler particles are wrapped by 20-mesh polyethylene gauze, the particle size of sulfur mine is 3-5mm, the particle size of limestone is 3-5mm, the particle size of steel slag is 6-8mm, and polyurethane is cube of 10 multiplied by 10 mm;
wherein, the bottom of first processing zone 1 and the bottom of second processing zone 2 all are provided with breather pipe 5, and air lets in first processing zone 1 through breather pipe 5, and the waste gas that front end sewage plant processing unit collected lets in second processing zone 2 through breather pipe 5, front end sewage plant processing unit collection waste gas be hydrolytic acidification tank waste gas intermittent type gas wash, waste gas major ingredient hydrogen sulfide, carbon dioxide, methane etc.. The first treatment area 1 and the second treatment area 2 are separated by a partition 7, and a communication hole 6 for allowing water in the first treatment area 1 to flow into the second treatment area 2 is arranged at the lower end of the partition 7;
the effective volume ratio of the first treatment area 1 to the second treatment area 2 is 1:2-4, the residence time of the sewage in the first treatment area 1 is 30min, the residence time of the sewage in the second treatment area 2 is 60min, the first treatment area is subjected to intermittent air washing, and the second treatment area 2 is subjected to intermittent air washing through waste gas of a hydrolytic acidification tank.
The method of the invention is adopted to treat the secondary biochemical effluent (COD) of the sewage plant Cr The concentration indexes of TP, TN and the like are about 40 to 60mg/L, 0.2 to 0.8mg/L and 10 to 17mg/L, and the COD is treated by the testing device of the embodiment 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, and raw water, water discharged from the first treatment area and water discharged from the second treatment area in different batches are taken for water quality detection, wherein 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 in the embodiment comprises the following steps:
(1) Flowing tail water of a sewage treatment plant into a first treatment area 1 from top to bottom through a water inlet 3 for oxygen elimination and phosphorus removal treatment, wherein the first treatment area 1 is filled with composite phosphorus removal balls, the composite phosphorus removal balls consist of a shell and phosphorus removal 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, the dephosphorization filler particles are composed of sponge iron and active 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 active carbon particles is 3-5mm, and the active carbon particles are wrapped by 10-mesh polyethylene gauze;
(2) The sewage after the oxygen and phosphorus removal treatment flows into the second treatment area 2 from the communication hole 6 at the lower end of the first treatment area 1, and flows out from the 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 consist 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, the denitrification filler particles are composed of the following raw materials in percentage by volume, namely 25% of sulfur, 8% of limestone, 1% of steel slag, 65% of volcanic rock and 1% of alkali-soaked corncob; the denitrification filler particles are wrapped by 10-mesh polyethylene gauze, the particle size of sulfur mine is 10-15mm, the particle size of limestone is 8-10mm, the particle size of steel slag is 8-10mm, and volcanic rock is cube of 10X 10 mm;
wherein, the bottom of first processing zone 1 and the bottom of second processing zone 2 all are provided with breather pipe 5, and air lets in first processing zone 1 through breather pipe 5, and the waste gas that front end sewage plant processing unit collected lets in second processing zone 2 through breather pipe 5, front end sewage plant processing unit collection waste gas be hydrolytic acidification tank waste gas intermittent type gas wash, waste gas major ingredient hydrogen sulfide, carbon dioxide, methane etc.. The first treatment area 1 and the second treatment area 2 are separated by a partition 7, and a communication hole 6 for allowing water in the first treatment area 1 to flow into the second treatment area 2 is arranged at the lower end of the partition 7;
the effective volume ratio of the first treatment area 1 to the second treatment area 2 is 1:2-4, the residence time of the sewage in the first treatment area 1 is 25min, the residence time of the sewage in the second treatment area 2 is 90min, the first treatment area is subjected to intermittent air washing, and the second treatment area 2 is subjected to intermittent air washing through waste gas of a hydrolytic acidification tank.
Example 3
The method for deep dephosphorization and denitrification of tail water of a sewage treatment plant in the embodiment comprises the following steps:
(1) Flowing tail water of a sewage treatment plant into a first treatment area 1 from top to bottom through a water inlet 3 for oxygen elimination and phosphorus removal treatment, wherein the first treatment area 1 is filled with composite phosphorus removal balls, the composite phosphorus removal balls consist of a shell and phosphorus removal filler particles arranged in the shell, the shell is in a spherical shape with the diameter of 150mm, and the surface of the shell is in a grid structure;
the shell is made of polyethylene, the dephosphorization filler particles are composed of scrap iron and active carbon particles according to a volume ratio of 10:1, the particle size of the scrap iron is 25-30mm, the particle size of the active carbon particles is 3-5mm, and the active carbon particles are wrapped by 10-mesh polyethylene gauze;
(2) The sewage after the oxygen and phosphorus removal treatment flows into the second treatment area 2 from the communication hole 6 at the lower end of the first treatment area 1, and flows out from the 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 consist of a shell and denitrification filler particles arranged in the shell, the shell is in a spherical shape with the diameter of 150mm, and the surface of the shell is in a grid structure;
the shell is made of polyethylene, the denitrification filler particles are composed of the following raw materials in percentage by volume, namely 27% of sulfur, 2% of limestone, 5% of steel slag, 61% of polyurethane and 5% of alkali-foamed wood dust; the denitrification filler particles are wrapped by 10-mesh polyethylene gauze, the particle size of sulfur mine is 3-5mm, the particle size of limestone is 3-5mm, the particle size of steel slag is 6-8mm, and polyurethane is cube of 10 multiplied by 10 mm;
wherein, the bottom of first processing zone 1 and the bottom of second processing zone 2 all are provided with breather pipe 5, and air lets in first processing zone 1 through breather pipe 5, and the waste gas that front end sewage plant processing unit collected lets in second processing zone 2 through breather pipe 5, front end sewage plant processing unit collection waste gas be hydrolytic acidification tank waste gas intermittent type gas wash, waste gas major ingredient hydrogen sulfide, carbon dioxide, methane etc.. The first treatment area 1 and the second treatment area 2 are separated by a partition 7, and a communication hole 6 for allowing water in the first treatment area 1 to flow into the second treatment area 2 is arranged at the lower end of the partition 7;
the effective volume ratio of the first treatment area 1 to the second treatment area 2 is 1:2-4, the residence time of the sewage in the first treatment area 1 is 20min, the residence time of the sewage in the second treatment area 2 is 30min, the first treatment area is subjected to intermittent air washing, and the second treatment area 2 is subjected to intermittent air washing through waste gas of a hydrolytic acidification tank.
The present inventors also examined the water quality index data of the effluent from the first treatment zone and the effluent from the second treatment zone in the treatment processes of examples 2 and 3, which are substantially identical to those of example 1, and they were not listed one by one because of limited space.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A method for deep dephosphorization and denitrification of tail water of a sewage treatment plant, which is characterized by comprising the following steps:
(1) Flowing tail water of a sewage treatment plant into a first treatment area from top to bottom for oxygen and phosphorus removal treatment;
(2) The sewage subjected to oxygen and phosphorus removal treatment flows into a 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;
the first treatment area is filled with composite dephosphorization balls, and the second treatment area is filled with composite denitrification biological balls;
the composite dephosphorization ball consists of a shell and dephosphorization filler particles arranged in the shell, wherein the shell is spherical with the diameter of 80-150mm, and the surface of the shell is of a grid structure;
the shell is made of polyethylene, and the dephosphorization filler particles consist of dephosphorization iron filler and active carbon particles according to the volume ratio of 3-10:1;
the dephosphorization iron filler is one or more of sponge iron, scrap iron or iron-carbon filler;
the particle size of the dephosphorizing iron filler is 8-30mm, and the particle size of the activated carbon particles is 3-5mm;
the active carbon particles are wrapped by 10-20 meshes of polyethylene gauze;
the composite denitrification biological ball consists of a shell and denitrification filler particles arranged in the shell, wherein the shell is spherical with the diameter of 80-150mm, and the surface of the shell is of a grid structure;
the shell is made of polyethylene, and the denitrification filler particles consist of sulfur-based materials, 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 adhesion 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 wood chips, wood blocks, corncobs or straws;
the biological adhesion filler is volcanic rock, polyurethane or ceramsite;
the denitrification filler particles are wrapped by 10-20 mesh polyethylene gauze.
2. A method for deep dephosphorization and denitrification of sewage treatment plant tail water according to claim 1, wherein one or more aeration pipes are provided at the bottom of the first treatment zone and at the bottom of the second treatment zone.
3. The method for deep dephosphorization and denitrification of tail water of a sewage treatment plant according to claim 2, wherein air is introduced into the first treatment area through a vent pipe, and air or waste gas collected by a front-end sewage treatment plant treatment unit is introduced into the second treatment area through a vent pipe;
the waste gas collected by the front-end sewage plant treatment unit is waste gas collected by a self-adjusting tank, a hydrolytic acidification tank or an anaerobic tank.
4. The method for deep dephosphorization and denitrification of tail water of sewage treatment plant according to claim 1, wherein the first treatment area and the second treatment area are separated by a partition, and a communication hole for water flowing into the second treatment area is provided at the lower end of the partition.
5. The method for deep dephosphorization and denitrification of tail water of a sewage treatment plant according to any one of claims 1 to 4, wherein the effective volume ratio of the first treatment area to the second treatment area is 1:2 to 4, the residence time of sewage in the first treatment area is 20 to 30min, and the residence time of sewage in the second treatment area is 30 to 90min.
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