CN106242002B - Improved enhanced phosphorus removal device and phosphorus removal process - Google Patents
Improved enhanced phosphorus removal device and phosphorus removal process Download PDFInfo
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- CN106242002B CN106242002B CN201610911333.9A CN201610911333A CN106242002B CN 106242002 B CN106242002 B CN 106242002B CN 201610911333 A CN201610911333 A CN 201610911333A CN 106242002 B CN106242002 B CN 106242002B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- 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
Abstract
The invention belongs to the technical field of advanced sewage treatment, and particularly relates to an improved enhanced phosphorus removal device and a phosphorus removal process. The process is mainly used for the condition that the phosphorus concentration of the effluent does not reach the standard after the biological sewage treatment process, the phosphorus removal agent is added into the water entering the secondary sedimentation tank to strengthen the flocculation phosphorus removal, and the inclined plate or the inclined pipe is arranged in the sedimentation tank, so that the sludge-water separation and the flocculation phosphorus removal of the effluent of the biochemical tank are completed in the same tank, and the sedimentation efficiency and the effluent effect are improved. The invention is suitable for the requirement of deep phosphorus removal after biological treatment, improves the effluent quality standard and reduces the investment cost of sewage plants.
Description
Technical Field
The invention belongs to the technical field of advanced sewage treatment, and particularly relates to an improved enhanced phosphorus removal device and a phosphorus removal process.
Background
At present, the method adopted for removing phosphorus in sewage treatment in China is mainly divided into biological, physical and chemical methods. The chemical method adopts a mode of adding medicaments, and the dosage is difficult to determine due to great change of components of the sewage. The physical method mainly adopts the steps of adding coagulant and coagulant aid, forming larger dirt-containing particles in water, and discharging the dirt-containing particles through a sedimentation tank. The prior art in China mainly adopts a biological method AAO (Anaerobic-Oxic) technology for synchronously removing nitrogen and phosphorus.
The AAO synchronous denitrification and dephosphorization technology mainly used by sewage plants in China enables sewage to flow through an anaerobic zone, an anoxic zone and an aerobic zone in sequence, phosphorus-accumulating bacteria in the sewage release phosphorus in an anaerobic state and absorb more phosphorus in an aerobic state, and the phosphorus is discharged out of the system in the form of residual sludge. And the sewage flows into a secondary sedimentation tank for sludge-water separation after passing through the AAO reaction tank, and a part of sludge flows back to the reaction tank. The method has the advantages that the phosphorus removal effect is difficult to improve, the sludge growth has a certain limit, the sludge growth is difficult to improve, and especially the P/BOD value is more obvious when the P/BOD value is high. At the moment, the phosphorus concentration of the effluent of the secondary sedimentation tank is difficult to control, and the phosphorus concentration of the effluent is higher than the national standard. The secondary effluent needs to be subjected to advanced treatment.
When the advanced treatment is carried out, the phosphorus concentration of the effluent of the secondary sedimentation tank is higher than the national discharge standard, phosphorus removal facilities such as a cloth filter or a chemical adding device are required to be additionally arranged, but the chemical adding device is required to be additionally arranged on the sedimentation tank, the load to be treated in the advanced treatment part is very low, and the investment and operation cost is very high.
At present, secondary sedimentation tanks used in China are generally radial flow type secondary sedimentation tanks, and mainly have the functions of realizing sludge-water separation, refluxing partial sludge, and simultaneously adding a small amount of PAC (polyaluminium chloride) to remove a small amount of phosphorus. Therefore, aiming at the operation condition of the existing sewage plant, the secondary sedimentation tank needs to be changed to have single function, so that the phosphorus removal rate is improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an improved enhanced phosphorus removal device and a phosphorus removal process, aiming at improving the phosphorus removal rate while realizing mud-water separation, completing the task of advanced treatment in the later period, reducing the load of advanced treatment or replacing the advanced treatment by changing the structure of a secondary sedimentation tank and adding an inclined plate inclined pipe and a chemical feeding pipe in a radial flow type secondary sedimentation tank.
The improved reinforced phosphorus removal device for realizing the purpose of the invention is a radial flow type secondary sedimentation tank, which consists of a coagulation area, a sedimentation area, a water outlet area and a sludge discharge area, wherein the coagulation area consists of a water inlet pipe and an annular coagulation gallery, the water inlet pipe is arranged on the side wall of the secondary sedimentation tank and is communicated with the annular coagulation gallery, the top of the annular coagulation gallery is provided with a pesticide feeding pipe, the bottom gradient is 10 ~ 15%, and the tail end 1/3 of the annular coagulation gallery is provided with a perforated tracery wall;
the settling zone is adjacent to the coagulation zone and consists of a heavy settling zone at the lower layer and an inclined plate or inclined tube settling zone at the upper layer, wherein the height of the inclined plate or inclined tube in the inclined plate or inclined tube settling zone is 1 ~ 1.2.2 m, the included angle between the inclined plate or inclined tube and the horizontal direction is 55 ~ 60 degrees, the distance between the inclined plates or the aperture of the inclined tubes is 70 ~ 90mm, and the solid load is less than or equal to 190 kg/(m) per unit volume2D), the inlet water passes through an inclined plate or an inclined pipe from bottom to top;
the water outlet area is positioned above the inclined plate or the inclined pipe of the inclined plate or inclined pipe settling area and comprises two annular water collecting grooves, and the annular water collecting grooves are connected with the water outlet pipe;
the sludge discharge area is positioned at the bottom of the secondary sedimentation tank, is provided with a sludge scraping truss driven by a motor, scrapes sludge at the bottom to a sludge storage hopper and is discharged by a sludge discharge pipe at the bottom of the secondary sedimentation tank.
Wherein the volume of the coagulation area is mixed with the water according to the water inflow and the muddy waterThe phosphorus concentration of the compound and the dosage of the added medicament are determined according to the formula V = (0.05 ~ 0.25). Q ·
Wherein V: volume of coagulation zone, m3And Q: inflow rate of mud-water mixture, m3H, C: phosphorus concentration (PO) of sludge-water mixture4 3-) mg/L, a: the dosage of the medicament is mg/h, namely the dosage of the mixed medicament in unit time, and the absolute value Qc-a is more than or equal to 0 and less than or equal to 2.
The volume of the sludge storage hopper is 5 percent of the total volume of the settling zone.
The dephosphorization process of the improved enhanced dephosphorization device is carried out according to the following steps:
(1) sending a sludge-water mixture of sewage treated by a biological method into a coagulation area of a secondary sedimentation tank through a water supply pipe, wherein the flow rate of a water inlet is 0.8 ~ 1.0.0 m/s, adding a phosphorus removal compound agent into the coagulation area through a dosing pipe, mixing and flocculating in an annular coagulation gallery, and pushing the mixture to move forward until the flow rate of the tail end of the annular coagulation gallery is 0.3 ~ 0.4.4 m/s, and entering the sedimentation area from a tracery wall;
(2) in the sedimentation zone, under the action of gravity, impurities with large specific gravity are firstly sedimentated at the bottom of the tank, floc particles with small specific gravity slowly rise along with water flow until reaching the inclined plate or inclined tube sedimentation zone, and the floc particles are sedimentated on the inclined plate or inclined tube to realize sludge-water separation, and the flocculent sludge which sinks and slides and is accumulated on the inclined plate or inclined tube is in reverse contact with the entering medicine-containing sludge-water mixture in the heavy sedimentation zone to further strengthen the sludge-water separation;
(3) the phosphorus-containing sludge precipitated by mud-water separation in the precipitation zone is scraped to a sludge storage hopper by a sludge scraping truss and is discharged through a sludge discharge pipe, clear water subjected to mud-water separation flows into a water outlet pipe through an annular water collecting tank, and the phosphorus concentration of the outlet water reaches the national discharge standard through detection.
The phosphorus removal composite medicament consists of 15% of flocculating agent polymeric ferric sulfate, 10% of polymeric aluminum chloride, 25% of crystallization reaction medicament magnesium sulfate, 25% of calcium chloride, 2% of quartz sand serving as a crystal nucleus, 3% of magnetite, 3% of tobermorite, 5% of bone charcoal, 5% of montmorillonite, 2% of coagulant aid polyacrylamide and 5% of dicyandiamide-formaldehyde polymer.
Compared with the prior art, the invention has the characteristics and beneficial effects that:
the improved reinforced phosphorus removal device is an improvement on the basis of the structure of the existing radial flow type secondary sedimentation tank, a coagulation area of the secondary sedimentation tank is positioned on the outer ring of the whole secondary sedimentation tank, the volume of the coagulation area is determined according to the inflow, the phosphorus concentration of a mud-water mixture and the dosage of a dosing agent, the bottom of an annular gallery of the coagulation area adopts a large-gradient design, the mud-water mixture to be precipitated after biological treatment is added with the phosphorus removal agent and then flows forward in a plug flow manner, and the coagulation effect is reinforced through the change of the flow speed and the gradient of the tank body; the main task of the settling zone is to realize the sludge-water separation of the traditional secondary settling tank by utilizing gravity, the upper layer is an inclined plate or inclined tube settling zone, and influent water passes through inclined plates and inclined tubes from bottom to top; the sludge discharge area is positioned at the bottom of the secondary sedimentation tank and mainly used for storing phosphorus-containing sludge which is separated from sludge and water and is precipitated in the precipitation area; the water outlet area is positioned at the upper part of the inclined plate or inclined pipe settling area, and clear water for realizing mud-water separation in the settling area flows out through the water collecting tank and enters and flows out into the water outlet pipe.
The improved enhanced phosphorus removal device realizes the synergistic operation of precipitation and phosphorus removal, improves the treatment efficiency, does not need to rebuild a treatment structure, and reduces the construction cost of civil engineering; the inclined plate or the inclined pipe is arranged in the secondary sedimentation tank, so that the surface load of a sedimentation area is increased, and the treatment capacity and the sedimentation efficiency are improved; the coagulation area of the invention adopts the large-gradient annular plug flow gallery, which is beneficial to improving the coagulation effect.
The process is mainly used for the condition that the phosphorus concentration of the effluent does not reach the standard after the biological sewage treatment process, the phosphorus removal agent is added into the water entering the secondary sedimentation tank to strengthen the flocculation phosphorus removal, and the inclined plate or the inclined pipe is arranged in the sedimentation tank, so that the sludge-water separation and the flocculation phosphorus removal of the effluent of the biochemical tank are completed in the same tank, and the sedimentation efficiency and the effluent effect are improved. The invention is suitable for the requirement of deep phosphorus removal after biological treatment, improves the effluent quality standard and reduces the investment cost of sewage plants.
Drawings
FIG. 1 is a schematic view of an improved enhanced phosphorus removal device according to the present invention;
FIG. 2 is a sectional view taken along the line A-A of the improved enhanced phosphorus removal device of the present invention;
FIG. 3 is a top view of an improved enhanced phosphorus removal device of the present invention;
wherein: 1: a water inlet pipe; 2: an annular coagulating gallery; 3: a heavy precipitation zone; 4: a sludge storage hopper: 5: a swash plate or a swash tube; 6: an annular water collection tank; 7: a mud scraping truss; 8: a sludge discharge pipe; 9: a motor; 10: a dosing tube; 11: a water outlet pipe; 12: and (5) perforating the tracery wall.
Detailed Description
The technical solution of the present invention is further described with reference to the following specific embodiments.
The improved reinforced phosphorus removal device is a radial-flow secondary sedimentation tank, as shown in figure 1 ~ 3, and consists of a coagulation area, a sedimentation area, a water outlet area and a sludge discharge area, wherein the coagulation area consists of a water inlet pipe 1 and an annular coagulation gallery 2, the water inlet pipe 1 is arranged on the side wall of the secondary sedimentation tank and communicated with the annular coagulation gallery 2, the top of the annular coagulation gallery 2 is provided with a pesticide feeding pipe 10, the bottom gradient is 10 ~ 15%, and the tail end 1/3 of the annular coagulation gallery 2 is provided with a perforated tracery wall 12;
the settling zone is adjacent to the coagulation zone and consists of a heavy settling zone 3 at the lower layer and an inclined plate or inclined tube settling zone at the upper layer, wherein the height of the inclined plate or inclined tube 5 of the inclined plate or inclined tube settling zone is 1 ~ 1.2m, the included angle between the inclined plate or inclined tube 5 and the horizontal direction is 55 ~ 60 degrees, the distance between the inclined plates or the aperture of the inclined tube is 70 ~ 90mm, and the solid load is less than or equal to 190 kg/(m) m2D), the inlet water passes through an inclined plate or an inclined pipe 5 from bottom to top;
the water outlet area is positioned above the inclined plate or inclined pipe 5 of the inclined plate or inclined pipe settling area and comprises two annular water collecting grooves 6, and the annular water collecting grooves 6 are connected with the water outlet pipe 11;
the sludge discharge area is positioned at the bottom of the secondary sedimentation tank, is provided with a sludge scraping truss 7 driven by a motor 9, scrapes sludge at the bottom to the sludge storage hopper 4 and is discharged by a sludge discharge pipe 8 at the bottom of the secondary sedimentation tank.
Wherein the volume of the coagulation area is determined according to the water inlet flow, the phosphorus concentration of the mud-water mixture and the dosage of the added medicament, and the volume is specifically determined according to the formula V = (0.05 ~ 0.25). Q ·Wherein V: volume of coagulation zone, m3And Q: inflow rate of mud-water mixture, m3H, C: phosphorus concentration (PO) of sludge-water mixture4 3-) mg/L, a: the dosage of the medicament is mg/h, namely the dosage of the mixed medicament in unit time, and the absolute value Qc-a is more than or equal to 0 and less than or equal to 2.
The volume of the sludge storage hopper 4 is 5 percent of the total volume of the settling zone.
In the embodiment, DN200 is selected as the water inlet pipe 1, and the water flow in the coagulation area is 100m3H, the phosphorus concentration is 1.5mg/L, and the dosage is 1.5 multiplied by 105mg/h, volume 25 m3；
The height of the inclined plate or inclined pipe in the precipitation zone is 1m, the placing angle of the inclined plate or inclined pipe is 60 degrees with the horizontal direction, the distance between the inclined plates or the aperture of the inclined pipe is 90mm, and the solid load is less than or equal to 190 kg/(m)2·d)
The phosphorus removal process of the improved enhanced phosphorus removal device adopting the parameters comprises the following steps:
(1) sending a sludge-water mixture of the sewage treated by a biological method, wherein the phosphorus content is 1.5mg/L, into a coagulation area of a secondary sedimentation tank through a water supply pipe, the flow speed of a water inlet is 1.0m/s, adding a phosphorus removal compound agent into the coagulation area through a dosing pipe 10, mixing and flocculating in an annular coagulation gallery 2, and forwarding by plug flow until the flow speed of the tail end of the annular coagulation gallery 2 is 0.4m/s, and entering the sedimentation area from a perforated tracery 12;
(2) in the sedimentation zone, under the action of gravity, impurities with large specific gravity are firstly precipitated at the bottom of the tank, floc particles with small specific gravity slowly rise along with water flow until reaching the inclined plate or inclined tube sedimentation zone, and are precipitated on the inclined plate or inclined tube 5 to realize sludge-water separation, and flocculent sludge which is accumulated on the inclined plate or inclined tube 5 and sinks and slides down reversely contacts with an entering medicine-containing sludge-water mixture in the heavy sedimentation zone 3 to further strengthen the sludge-water separation;
(3) the phosphorus-containing sludge precipitated by mud-water separation in the precipitation zone is scraped 7 to a sludge storage hopper 4 by a mud scraping truss and is discharged through a sludge discharge pipe 8, clear water subjected to mud-water separation flows into a water outlet pipe 11 through an annular water collecting tank 6, and the phosphorus concentration of the outlet water reaches the national discharge standard, namely TP 0.5mg/L and SS 5mg/L of the outlet water.
The phosphorus removal composite medicament consists of 15% of flocculating agent polymeric ferric sulfate, 10% of polymeric aluminum chloride, 25% of crystallization reaction medicament magnesium sulfate, 25% of calcium chloride, 2% of quartz sand serving as a crystal nucleus, 3% of magnetite, 3% of tobermorite, 5% of bone charcoal, 5% of montmorillonite, 2% of coagulant aid polyacrylamide and 5% of dicyandiamide-formaldehyde polymer.
Claims (2)
1. An improved enhanced phosphorus removal device is characterized in that the device is of a radial flow type secondary sedimentation tank structure and consists of a coagulation zone, a sedimentation zone, a water outlet zone and a sludge discharge zone; the coagulation area consists of a water inlet pipe and an annular coagulation gallery, the water inlet pipe is arranged on the side wall of the secondary sedimentation tank and communicated with the annular coagulation gallery, a chemical dosing pipe is arranged at the top of the annular coagulation gallery, the gradient of the bottom of the annular coagulation gallery is 10-15%, a perforated tracery wall is arranged at the tail end 1/3 of the annular coagulation gallery, and a phosphorus removal compound chemical is added into the coagulation area through the chemical dosing pipe;
the settling zone is adjacent to the coagulation zone and consists of a heavy settling zone at the lower layer and an inclined plate or inclined tube settling zone at the upper layer, wherein the height of the inclined plate or inclined tube in the inclined plate or inclined tube settling zone is 1-1.2 m, the included angle between the inclined plate or inclined tube and the horizontal direction is 55-60 degrees, the distance between the inclined plates or the aperture of the inclined tube is 70-90 mm, and the solid load is less than or equal to 190 kg/(m) m2D), the inlet water passes through an inclined plate or an inclined pipe from bottom to top;
the water outlet area is positioned above the inclined plate sedimentation area or the inclined tube sedimentation area and comprises two annular water collecting grooves, and the annular water collecting grooves are connected with the water outlet pipe;
the sludge discharge area is positioned at the bottom of the secondary sedimentation tank, is provided with a sludge scraping truss driven by a motor, scrapes sludge at the bottom to a sludge storage hopper and discharges the sludge from a sludge discharge pipe at the bottom of the secondary sedimentation tank;
the phosphorus removal composite medicament consists of 15 percent of flocculating agent polymeric ferric sulfate, 10 percent of polymeric aluminum chloride, 25 percent of crystallization reaction medicament magnesium sulfate, 25 percent of calcium chloride, 2 percent of quartz sand serving as crystal nucleus, 3 percent of magnetite, 3 percent of tobermorite, 5 percent of bone charcoal, 5 percent of montmorillonite, 2 percent of coagulant aid polyacrylamide and 5 percent of dicyandiamide-formaldehyde polymer;
the volume of the sludge storage hopper is 5 percent of the total volume of the settling zone.
2. The process for removing phosphorus by adopting the improved enhanced phosphorus removal device as claimed in claim 1, which is characterized by comprising the following steps:
(1) sending a sludge-water mixture of sewage treated by a biological method into a coagulation area of a secondary sedimentation tank through a water inlet pipe, wherein the flow rate of a water inlet is 0.8-1.0 m/s, adding a phosphorus removal compound agent into the coagulation area through a dosing pipe, mixing and flocculating in an annular coagulation gallery, and pushing the mixture to move forward until the flow rate of the tail end of the annular coagulation gallery is 0.3-0.4 m/s, and entering the sedimentation area from a perforated tracery wall;
(2) in the sedimentation zone, under the action of gravity, impurities with large specific gravity are firstly sedimentated at the bottom of the tank, floc particles with small specific gravity slowly rise along with water flow until reaching the inclined plate or inclined tube sedimentation zone, and the floc particles are sedimentated on the inclined plate or inclined tube to realize sludge-water separation, and the flocculent sludge which sinks and slides and is accumulated on the inclined plate or inclined tube is in reverse contact with the entering medicine-containing sludge-water mixture in the heavy sedimentation zone to further strengthen the sludge-water separation;
(3) the phosphorus-containing sludge precipitated by mud-water separation in the precipitation zone is scraped to a sludge storage hopper by a sludge scraping truss and is discharged through a sludge discharge pipe, clear water subjected to mud-water separation flows into a water outlet pipe through an annular water collecting tank, and the phosphorus concentration of the outlet water reaches the national discharge standard through detection.
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| CN201610911333.9A CN106242002B (en) | 2016-10-20 | 2016-10-20 | Improved enhanced phosphorus removal device and phosphorus removal process |
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| CN108821457A (en) * | 2018-05-31 | 2018-11-16 | 杜美凤 | A kind of sanitary sewage preliminary treatment and recycling device |
| CN115092997B (en) * | 2022-06-14 | 2023-03-24 | 温州杭钢水务有限公司 | Stable operation energy-saving consumption-reducing control method and system for high-load efficient sedimentation tank |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201684443U (en) * | 2010-01-05 | 2010-12-29 | 廖一 | Secondary flocculation inclined plate and tube sediment device |
| CN104310641A (en) * | 2014-10-22 | 2015-01-28 | 北京市环境保护科学研究院 | Deep phosphorous removal method for low-phosphorous water |
| CN204237611U (en) * | 2014-11-21 | 2015-04-01 | 江苏立能环保水处理工程有限公司 | Synchronous removal phosphorus and organic waste disposal plant |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201684443U (en) * | 2010-01-05 | 2010-12-29 | 廖一 | Secondary flocculation inclined plate and tube sediment device |
| CN104310641A (en) * | 2014-10-22 | 2015-01-28 | 北京市环境保护科学研究院 | Deep phosphorous removal method for low-phosphorous water |
| CN204237611U (en) * | 2014-11-21 | 2015-04-01 | 江苏立能环保水处理工程有限公司 | Synchronous removal phosphorus and organic waste disposal plant |
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