CN210457719U - Postposition chemical dosing and biological combined optimization phosphorus removal device - Google Patents
Postposition chemical dosing and biological combined optimization phosphorus removal device Download PDFInfo
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- CN210457719U CN210457719U CN201920782640.0U CN201920782640U CN210457719U CN 210457719 U CN210457719 U CN 210457719U CN 201920782640 U CN201920782640 U CN 201920782640U CN 210457719 U CN210457719 U CN 210457719U
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Abstract
The utility model discloses a postposition chemical dosing and biological combined optimization phosphorus removal device, which comprises a biochemical tank (1), a secondary sedimentation tank (2), a sludge return pipe (3), a sludge discharge pipe (4), a chemical sedimentation tank (6), a chemical phosphorus removal device (7), a sediment discharge pipe (8) and a biological phosphorus removal area (10); the biochemical tank is connected with the secondary sedimentation tank, one sewage discharge outlet of the secondary sedimentation tank is communicated with the biochemical tank through a sludge return pipe, and the sludge discharge pipe is connected with the other sewage discharge outlet of the secondary sedimentation tank; the water outlet of the secondary sedimentation tank is connected with the chemical sedimentation tank and the biological phosphorus removal area through a pipeline, the chemical phosphorus removal device puts chemical agents into the chemical sedimentation tank, and the sediment discharge pipe is connected with the discharge port of the chemical sedimentation tank; the chemical sedimentation tank and the biological phosphorus removal area are connected with a discharge pipeline. The utility model discloses a combination and complementation of rearmounted chemistry medicine and biological dephosphorization mode ensures that the total phosphorus of play water reaches sewage one-level A emission standard to the throwing of chemical agent has been reduced and has been thrown.
Description
Technical Field
The utility model relates to a phosphorus removal device for sewage treatment especially relates to a rearmounted chemistry adds medicine and biological dephosphorization device that jointly optimizes.
Background
At present, rural economy develops rapidly, and the standard of living of farmers is greatly improved, but rural environment construction and economic development are asynchronous, wherein the problem of water environment pollution is particularly serious. Due to the condition restriction and the weakness of the concept of environmental awareness, sewage is mostly collected by open channels or closed pipes in rural areas of China, sewage collection facilities are simple and crude, rainwater and sewage diversion cannot be realized, extensive discharge modes, simple and crude pipe network facilities and lack of maintenance are important factors causing low collection rate of rural domestic sewage, most of domestic sewage is discharged randomly, water quality deterioration and even black and odorous of the channels and ponds are caused, rural living environment is greatly influenced, health of residents is harmed, and meanwhile drinking water source pollution and eutrophication of rivers and lakes can be caused.
Various technologies and processes have been developed for rural sewage comprehensive treatment, and rural areas have dispersibility compared with cities and are not easy to concentrate and manage, and the mainstream treatment mode is distributed integrated sewage treatment equipment, so that corresponding treatment equipment can be selected according to local conditions and according to population and sewage quantity. The prior sewage treatment equipment adopts biochemical technology, including the traditional activated sludge method and modified A2O, MBR, UCT, CASS and the like, and the integration of biochemical technology, the technology has better removal effect on rural domestic sewage, especially on organic COD and ammonia nitrogen, and the effluent can reach the first-level A discharge standard. Although the biochemical reaction has a good effect on removing the total phosphorus, the total phosphorus of the effluent after passing through the biochemical tank is difficult to reach the standard below 0.5mg/L due to the mutual restriction of denitrification and dephosphorization of the biochemical reaction. According to research results, the main factor causing the eutrophication of the river water body at present is the over-standard phosphorus content of the water body, so that the source control becomes important.
At present, chemical dosing dephosphorization is mostly adopted as an effective dephosphorization means, but rural residents are sensitive to chemical agents, the economic cost of operation of chemical dosing dephosphorization is high, and the method has a certain restriction effect on a secondary sewage dephosphorization method.
Disclosure of Invention
An object of the utility model is to provide a rearmounted chemistry adds medicine and biological dephosphorization device and method of jointly optimizing, through the combination and the complementation of rearmounted chemistry with biological dephosphorization mode, ensures that the total phosphorus of water reaches sewage one-level A emission standard to the throwing of chemical agent has been reduced.
The utility model discloses a realize like this:
a postposition chemical dosing and biological combined optimized phosphorus removal device comprises a biochemical tank, a secondary sedimentation tank, a sludge return pipe, a sludge discharge pipe, a chemical sedimentation tank, a chemical phosphorus removal device, a sediment outlet pipe and a biological phosphorus removal area; the water outlet of the biochemical tank is connected with the water inlet of the secondary sedimentation tank, the sewage outlet at one side of the secondary sedimentation tank is connected with the sewage inlet of the biochemical tank through a sludge return pipe, and the sludge discharge pipe is connected with the sewage outlet at the other side of the secondary sedimentation tank; the water outlet of the secondary sedimentation tank is respectively connected to the chemical sedimentation tank and the biological phosphorus removal area through pipelines, the chemical phosphorus removal device puts chemical agents into the chemical sedimentation tank, and the sediment discharge pipe is connected with the discharge port of the chemical sedimentation tank; the water outlets of the chemical sedimentation tank and the biological phosphorus removal area are connected to a discharge pipeline.
The postposition chemical dosing and biological combined optimization phosphorus removal device also comprises an overproof early warning component, wherein the overproof early warning component comprises a chemical phosphorus removal water inlet electromagnetic valve, a biological phosphorus removal water inlet electromagnetic valve, an online detector, a biological phosphorus removal water outlet electromagnetic valve and a chemical phosphorus removal water outlet electromagnetic valve; the chemical phosphorus removal water inlet electromagnetic valve is arranged on a pipeline between the secondary sedimentation tank and the chemical sedimentation tank, and the biological phosphorus removal water inlet electromagnetic valve is arranged on a pipeline between the secondary sedimentation tank and the biological phosphorus removal area; the online detector is arranged on the discharge pipeline, the biological phosphorus removal water outlet electromagnetic valve is arranged on the pipeline between the online detector and the biological phosphorus removal area, and the chemical phosphorus removal water outlet electromagnetic valve is arranged on the pipeline between the online detector and the chemical sedimentation tank; the on-line detector is connected with the chemical dephosphorization water inlet electromagnetic valve, the biological dephosphorization water outlet electromagnetic valve and the chemical dephosphorization water outlet electromagnetic valve.
The biological phosphorus removal area comprises a water distribution pipe, an ecological filler and a water collecting pipe, wherein the water distribution pipe, the ecological filler and the water collecting pipe are arranged into an underflow wetland from top to bottom, and aquatic plants are planted on the underflow wetland; the water outlet of the secondary sedimentation tank is connected with the water distribution pipe through a pipeline, and the water collecting pipe is connected with the discharge pipeline through a pipeline.
The biological phosphorus removal area comprises a water distribution pipe, an ecological filler and a water collecting pipe, wherein the water distribution pipe, the ecological filler and the water collecting pipe are arranged into an undercurrent wetland from top to bottom, and total aquatic plants are arranged on the undercurrent wetland; the water outlet of the secondary sedimentation tank is connected with the water distribution pipe through a pipeline, and the water collecting pipe is connected with the discharge pipeline through a pipeline.
And an anti-seepage layer is arranged in the biological phosphorus removal area and is paved on the periphery of the subsurface wetland.
The aquatic plants are three-dimensionally matched thalictrum, reed, water lily and desmodium.
The ecological filler comprises coarse aggregate crushed stone, ceramsite and cobblestone, and the coarse aggregate crushed stone, the ceramsite and the cobblestone are sequentially laid from top to bottom.
The utility model adopts the technology of the synergy and complementation of post-chemical phosphorus removal and biological phosphorus removal in the biochemical subsequent process, and the post-phosphorus removal can ensure that the chemical precipitation is separated from the biological treatment process without mutual influence; meanwhile, the generated phosphate sludge can be discharged independently and can be utilized. The utility model discloses an online real-time supervision goes out water total phosphorus, sets for total phosphorus early warning index, carries out the automatic switch-over of dephosphorization technology through the early warning, realizes chemistry and biological dephosphorization method organic alternate operation, realizes that chemical agent adds suitable quantization and economy, biological dephosphorization maximize when finally guaranteeing to go out water total phosphorus and reaching sewage one-level A emission standard.
Drawings
FIG. 1 is a front view of the post-chemical dosing and biological combined optimized phosphorus removal device of the present invention;
FIG. 2 is a flow chart of the post-chemical dosing and biological combined phosphorus removal method of the present invention.
In the figure, 1 a biochemical tank, 2 a secondary sedimentation tank, 3 a sludge return pipe, 4 a sludge discharge pipe, 5 a chemical phosphorus removal water inlet electromagnetic valve, 6 a chemical sedimentation tank, 7 a chemical phosphorus removal device, 8 a sediment outlet pipe, 9 a biological phosphorus removal water inlet electromagnetic valve, 10 a biological phosphorus removal area, 11 an impermeable layer, 12 a water distribution pipe, 13 ecological fillers, 14 a water collection pipe, 15 an online detector, 16 a biological phosphorus removal water outlet electromagnetic valve and 17 a chemical phosphorus removal water outlet electromagnetic valve.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
Referring to the attached figure 1, the postposition chemical dosing and biological combined optimized phosphorus removal device comprises a biochemical tank 1, a secondary sedimentation tank 2, a sludge return pipe 3, a sludge discharge pipe 4, a chemical sedimentation tank 6, a chemical phosphorus removal device 7, a sediment discharge pipe 8 and a biological phosphorus removal area 10; the water outlet of the biochemical tank 1 is connected with the water inlet of the secondary sedimentation tank 2, the sewage outlet on one side of the bottom of the secondary sedimentation tank 2 is connected with the sewage inlet of the biochemical tank 1 through a sludge return pipe 3, so that part of sludge can flow back into the biochemical tank 1 through the sludge return pipe 3, and the sludge discharge pipe 4 is connected with the sewage outlet on the other side of the bottom of the secondary sedimentation tank 2 and is used for discharging residual sludge; the water outlet of the secondary sedimentation tank 2 is respectively connected to the chemical sedimentation tank 6 and the biological phosphorus removal zone 10 through pipelines, and the supernatant in the secondary sedimentation tank 2 is respectively conveyed to the chemical sedimentation tank 6 and the biological phosphorus removal zone 10 for respectively carrying out chemical phosphorus removal and biological phosphorus removal; a chemical dephosphorizing device 7 puts chemical agents into the chemical sedimentation tank 6 for chemical reaction, and a sediment outlet pipe 8 is connected with a discharge port of the chemical sedimentation tank 6 for discharging sediment; the water outlets of the chemical sedimentation tank 6 and the biological phosphorus removal zone 10 are connected to a discharge pipeline for discharging the supernatant liquid after phosphorus removal.
The postposition chemical dosing and biological combined optimization phosphorus removal device also comprises an overproof early warning component, wherein the overproof early warning component comprises a chemical phosphorus removal water inlet electromagnetic valve 5, a biological phosphorus removal water inlet electromagnetic valve 9, an online detector 15, a biological phosphorus removal water outlet electromagnetic valve 16 and a chemical phosphorus removal water outlet electromagnetic valve 17; the chemical phosphorus removal water inlet electromagnetic valve 5 is arranged on a pipeline between the secondary sedimentation tank 2 and the chemical sedimentation tank 6, and the biological phosphorus removal water inlet electromagnetic valve 9 is arranged on a pipeline between the secondary sedimentation tank 2 and the biological phosphorus removal zone 10; the online detector 15 is arranged on a discharge pipeline, the biological phosphorus removal effluent electromagnetic valve 16 is arranged on a pipeline between the online detector 15 and the biological phosphorus removal area 10, and the chemical phosphorus removal effluent electromagnetic valve 17 is arranged on a pipeline between the online detector 15 and the chemical sedimentation tank 6; the on-line detector 15 is connected with the chemical phosphorus removal water inlet electromagnetic valve 5, the biological phosphorus removal water inlet electromagnetic valve 9, the biological phosphorus removal water outlet electromagnetic valve 16 and the chemical phosphorus removal water outlet electromagnetic valve 17. Preferably, the on-line detector 15 may adopt a detection device of the existing mature technology for detecting the total phosphorus content in the sewage, and may control the opening and closing of each electromagnetic valve according to the total phosphorus content.
The biological phosphorus removal area 10 comprises a water distribution pipe 12, an ecological filler 13 and a water collection pipe 14, wherein the water distribution pipe 12, the ecological filler 13 and the water collection pipe 14 are arranged into an underflow wetland from top to bottom, and total aquatic plants on the underflow wetland are obtained; the water outlet of the secondary sedimentation tank 2 is connected with the water distribution pipe 12 through a pipeline, the water collecting pipe 14 is connected with the discharge pipeline through a pipeline, and the biological phosphorus removal maximization is achieved through the subsurface flow wetland, so that the input amount of chemical agents is reduced.
An impermeable layer 11 is arranged in the biological phosphorus removal area 10, the impermeable layer 11 is paved on the periphery of the subsurface wetland, and preferably, the impermeable layer 11 can be made of HDPE materials and can prevent sewage leakage.
The aquatic plants can be selected from the flowers, the reeds, the water lily and the lysimachia christinae which are matched in a three-dimensional mode, preferably, the height of the emergent aquatic plants, namely the reeds, is 1.5-1.8 m, the height of the plants of the reeds is 0.8-1.2 m, the height of the plants of the floating plants, namely the lysimachia christinae is 0.2-0.3 m, the water lily floats on the water surface, the heights are staggered and matched to form a spatial stereoscopic impression, and the aquatic plants have aesthetic feeling and a good phosphorus removal effect.
The ecological filler 13 comprises coarse aggregate crushed stone, ceramsite and cobblestone, wherein the coarse aggregate crushed stone, the ceramsite and the cobblestone are sequentially laid from top to bottom, and preferably, the volume ratio of the coarse aggregate crushed stone to the cobblestone is 2:1: 7-2: 2: 6.
Referring to fig. 2, a post-chemical dosing and biological combined phosphorus removal method includes the following steps:
step 1: sewage in the biochemical tank 1 enters a secondary sedimentation tank 2 through a water outlet, partial sludge in the secondary sedimentation tank 2 flows back into the biochemical tank 1 through a sludge return pipe 3 through a pump body, preferably, the sludge return ratio is 50% -100%, residual sludge is discharged from a sludge discharge pipe 4 and then treated, and meanwhile, the step 2 and the step 4 are executed, and the automatic switching of the closing of an electromagnetic valve is realized according to season and water outlet online real-time monitoring data.
Step 2: the sewage in the secondary sedimentation tank 2 enters a chemical sedimentation tank 6 through a pipeline and controlled by a chemical dephosphorization water inlet electromagnetic valve 5, and chemical agents are put into the chemical sedimentation tank 6 through a chemical dephosphorization device 7 for reaction, so that the total phosphorus in the sewage is removed.
Preferably, the chemical agent added by the chemical phosphorus removal device 7 can be polyaluminium salt, and the aluminum salt requirement coefficient is controlled within a range of 1.5-3 according to the total phosphorus removal efficiency.
And step 3: chemical agent and sewage form metal phosphate precipitate after chemical reaction in chemical precipitation pond 6, because do not contain biological mud in the precipitate, the precipitate accessible precipitate outer calandria 8 discharges, the recycle of being convenient for, and the supernatant in the chemical precipitation pond 6 is discharged through the discharge pipe, shifts to step 6.
And 4, step 4: the sewage in the secondary sedimentation tank 2 enters a biological phosphorus removal area 10 through another pipeline and controlled by a biological phosphorus removal water inlet electromagnetic valve 9 to remove the total phosphorus in the sewage.
The method for removing phosphorus in the biological phosphorus removal zone 10 specifically comprises the following steps: the water distribution pipe 12, the ecological filler 13 and the water collection pipe 14 are arranged into an underflow wetland from top to bottom, and the total value of the underflow wetland is aquatic plants; water flow enters the subsurface flow wetland along the water distribution pipe 12 and is respectively adsorbed and filtered from top to bottom through the aquatic plants and the ecological fillers 13.
And 5: the sewage in the biological phosphorus removal area 10 is collected by the water collecting pipe 14 and then discharged through the discharge pipeline, so that the sewage is discharged from the biological phosphorus removal area 10.
Step 6: an online detector 15 is installed on the discharge pipeline, effluent is monitored in real time by the online detector 15, if the total phosphorus of the effluent exceeds the standard, the effluent is subjected to linkage control by an exceeding early warning component, and if the total phosphorus of the effluent reaches the standard, the effluent is normally discharged.
The linkage control method of the overproof early warning assembly specifically comprises the following steps: if the total phosphorus of the effluent exceeds 0.5mg/L, closing the biological phosphorus removal water inlet electromagnetic valve 9 and the biological phosphorus removal water outlet electromagnetic valve 16, and simultaneously opening the chemical phosphorus removal water inlet electromagnetic valve 5 and the chemical phosphorus removal water outlet electromagnetic valve 17, only adopting chemical phosphorus removal without additionally increasing the chemical agent adding amount until the total phosphorus of the effluent reaches the standard, realizing the linkage of the water inlet and outlet valves, and realizing the immediate response to the standard exceeding of the total phosphorus of the effluent through controlling the electromagnetic valves. The automatic switching or simultaneous operation of biological phosphorus removal and chemical phosphorus removal is controlled by the over-standard early warning component in a linkage manner, so that the aims of maximizing the biological phosphorus removal function and minimizing the addition amount of chemical agents are fulfilled.
Preferably, the time of linkage control of the overproof early warning component is set to be 5 months, 20 days to 11 months and 15 days every year, the total time is 6 months, the biological phosphorus removal area in the time period has a good effect, the effluent water can meet the first-level A emission standard, and the early warning is mainly set to prevent abnormal conditions such as rainstorm scouring and water quality mutation. And in other months, only the chemical phosphorus removal device is started, so that the total phosphorus in the effluent can be discharged after reaching the standard.
Example 1:
the rural domestic sewage treatment device adopts post-positioned chemical phosphorus removal and biological combined phosphorus removal, and the treatment scale is 15m3And d, carrying out biochemical reaction on the sewage inflow water with total phosphorus of 5.2mg/L through a biochemical tank 1, and then carrying out precipitation separation through a secondary sedimentation tank 2, wherein the sludge reflux proportion in a sludge reflux pipe 3 is 75%, the total phosphorus of the effluent of the secondary sedimentation tank 2 is 3.1mg/L, and the test period is 3 months and 12 days to 10 months and 11 days, and is seven months in total. And 3, 12 days per month to 5, 20 days per month, starting a chemical phosphorus removal water inlet electromagnetic valve 5 and a chemical phosphorus removal water outlet electromagnetic valve 17, closing a biological phosphorus removal water inlet electromagnetic valve 9 and a biological phosphorus removal water outlet electromagnetic valve 16, enabling the effluent of the subsequent secondary sedimentation tank 2 to pass through a chemical sedimentation tank 6, enabling the effective aluminum requirement coefficient of the medicament in the chemical phosphorus removal device 7 to be 2, enabling the adding effective aluminum salt amount to be 85.5mg/L, and enabling the total phosphorus in the effluent to be less than 0.5mg/L through detection of an online monitor 15 in the period, so that the first-level A discharge standard of the total phosphorus is met.
And 5, 21 days to 10, 11 days, closing the chemical phosphorus removal water inlet electromagnetic valve 5 and the chemical phosphorus removal water outlet electromagnetic valve 17, opening the biological phosphorus removal water inlet electromagnetic valve 9 and the biological phosphorus removal water outlet electromagnetic valve 16, wherein the volume ratio of coarse aggregate crushed stone, ceramsite and cobble of the ecological filler 13 in the biological phosphorus removal area 10 is 2:1:7, performing biodegradation adsorption in the biological phosphorus removal area 10, detecting by an online monitor 15, and ensuring that the total phosphorus in the effluent is less than 0.5mg/L to meet the first-grade A emission standard of the total phosphorus. In the period, the effective aluminum salt amount of the chemical agent is saved by 180kg, the usage amount of the chemical agent is greatly reduced, and the effluent is ensured to reach the discharge standard.
Example 2:
the rural domestic sewage treatment device adopts post-positioned chemical phosphorus removal and biological combined phosphorus removal, and the treatment scale is 25m3And d, carrying out biochemical reaction on the sewage inflow water with total phosphorus of 5.8mg/L through a biochemical tank 1, and then carrying out precipitation separation through a secondary sedimentation tank 2, wherein the sludge reflux proportion in a sludge reflux pipe 3 is 80%, the total phosphorus in the effluent of the secondary sedimentation tank 2 is 3.9mg/L, and the test period is 1 month 16 days to 9 months 15 days for eight months. And (3) from 16 days at 1 month to 20 days at 5 months, the cycle runs for 124 days, a chemical phosphorus removal water inlet electromagnetic valve 5 and a chemical phosphorus removal water outlet electromagnetic valve 17 are opened, a biological phosphorus removal water inlet electromagnetic valve 9 and a biological phosphorus removal water outlet electromagnetic valve 16 are closed, the water outlet of a subsequent secondary sedimentation tank 2 passes through a chemical sedimentation tank 6, the effective aluminum requirement coefficient of the medicament in a chemical phosphorus removal device 7 is 2, the added effective aluminum salt amount is 111.7mg/L, the total phosphorus in the water is less than 0.5mg/L through the detection of an online monitor 15 in the cycle, and the first-grade A discharge standard of the total phosphorus is met. The effective aluminum salt amount of the chemical agent co-fed in the period is 346 kg.
And 5, 21 days to 9, 15 days, closing the chemical phosphorus removal water inlet electromagnetic valve 5 and the chemical phosphorus removal water outlet electromagnetic valve 17, opening the biological phosphorus removal water inlet electromagnetic valve 9 and the biological phosphorus removal water outlet electromagnetic valve 16, wherein the volume ratio of coarse aggregate macadam, ceramsite and cobblestone of the ecological filler 13 in the biological phosphorus removal area 10 is 2:1:7, and the total phosphorus in the effluent is less than 0.5mg/L through biodegradation and adsorption in the biological phosphorus removal area 10.
Wherein, in 8 months 4 days-8 months 9 days, the total phosphorus of the on-line monitor 15 exceeds the standard due to sudden drop and rainstorm, the early warning is triggered, the biological dephosphorization water inlet electromagnetic valve 9 and the biological dephosphorization water outlet electromagnetic valve 16 are automatically closed, meanwhile, the chemical dephosphorization water inlet electromagnetic valve 5 and the chemical dephosphorization water outlet electromagnetic valve 17 are opened, the chemical dephosphorization device 7 starts to add the chemicals, and the effluent is ensured to be discharged after reaching the standard.
In the period, except for the chemical phosphorus removal started in extreme weather of rainstorm, the rest of the chemical phosphorus removal is carried out by adopting biological phosphorus removal, the effective aluminum salt amount of the chemical agent is saved and is 335kg, the adding amount of the chemical agent is reduced by 49.2 percent in the whole period, and the standard discharge of the total phosphorus in the effluent of the system is ensured.
Example 3:
a rural domestic sewage treatment device adopting post-positioned chemistryPhosphorus removal and biological combined phosphorus removal with the treatment scale of 50m3And d, carrying out biochemical reaction on the sewage inflow total phosphorus of 4.7mg/L in the biochemical tank 1, and then carrying out precipitation separation in the secondary sedimentation tank 2, wherein the sludge reflux proportion in the sludge reflux pipe 3 is 65%, the total phosphorus in the effluent of the secondary sedimentation tank 2 is 2.8mg/L, and the test period is from 8 months to 20 days from 12 months for four months. And (3) operating for 20 days to 11 days and 15 days in the period, starting a biological phosphorus removal water inlet electromagnetic valve 9 and a biological phosphorus removal water outlet electromagnetic valve 16, closing a chemical phosphorus removal water inlet electromagnetic valve 5 and a chemical phosphorus removal water outlet electromagnetic valve 17, leading the water discharged from a subsequent secondary sedimentation tank 2 to pass through a biological phosphorus removal area 10, leading the volume ratio of coarse aggregate crushed stone, ceramsite and cobblestone of the ecological filler 13 to be 2:2:6, carrying out biodegradation adsorption in the biological phosphorus removal area 10, and leading the total phosphorus of the discharged water to be less than 0.5mg/L through detection by an online monitor 15 in the period, thereby meeting the first-grade A emission standard of the total phosphorus.
The cycle is operated for 35 days from 16 days at 11 months to 20 days at 12 months, the effluent of the subsequent secondary sedimentation tank 2 passes through the chemical sedimentation tank 6, the effective aluminum requirement coefficient of the chemical phosphorus removal device 7 is 1.8, the effective aluminum salt adding amount is 68.1mg/L, the total phosphorus of the effluent is less than 0.5mg/L through the detection of the online monitor 15 in the cycle, and the total phosphorus A discharge standard of the total phosphorus level is met. The effective aluminum salt amount of the chemical agent added in the period is 59.5 kg.
The period runs for 122 days in total, wherein chemical phosphorus removal lasts for 35 days, biological phosphorus removal lasts for 97 days, the effective aluminum salt amount of chemical agents can be saved by biological phosphorus removal and is 165kg, the chemical agent adding amount is reduced by 73.5% in the whole period, the chemical agent using amount is greatly reduced, and the standard discharge of the total phosphorus of system effluent is ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, therefore, any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.
Claims (6)
1. The utility model provides a rearmounted chemistry adds medicine and biological dephosphorization device that jointly optimizes, characterized by: comprises a biochemical tank (1), a secondary sedimentation tank (2), a sludge return pipe (3), a sludge discharge pipe (4), a chemical sedimentation tank (6), a chemical phosphorus removal device (7), a sediment discharge pipe (8) and a biological phosphorus removal area (10); a water outlet of the biochemical tank (1) is connected with a water inlet of the secondary sedimentation tank (2), a sewage outlet at one side of the secondary sedimentation tank (2) is connected with a sewage inlet of the biochemical tank (1) through a sludge return pipe (3), and a sludge discharge pipe (4) is connected with a sewage outlet at the other side of the secondary sedimentation tank (2); the water outlet of the secondary sedimentation tank (2) is respectively connected to a chemical sedimentation tank (6) and a biological phosphorus removal area (10) through pipelines, a chemical phosphorus removal device (7) puts chemical agents into the chemical sedimentation tank (6), and a sediment discharge pipe (8) is connected with the discharge port of the chemical sedimentation tank (6); the chemical sedimentation tank (6) and the water outlet of the biological phosphorus removal area (10) are connected to a discharge pipeline.
2. The postposition chemical dosing and biological combined optimization phosphorus removal device of claim 1, which is characterized in that: the postposition chemical dosing and biological combined optimization phosphorus removal device also comprises an overproof early warning component, wherein the overproof early warning component comprises a chemical phosphorus removal water inlet electromagnetic valve (5), a biological phosphorus removal water inlet electromagnetic valve (9), an online detector (15), a biological phosphorus removal water outlet electromagnetic valve (16) and a chemical phosphorus removal water outlet electromagnetic valve (17); the chemical phosphorus removal water inlet electromagnetic valve (5) is arranged on a pipeline between the secondary sedimentation tank (2) and the chemical sedimentation tank (6), and the biological phosphorus removal water inlet electromagnetic valve (9) is arranged on a pipeline between the secondary sedimentation tank (2) and the biological phosphorus removal area (10); the online detector (15) is arranged on a discharge pipeline, the biological phosphorus removal water outlet electromagnetic valve (16) is arranged on a pipeline between the online detector (15) and the biological phosphorus removal area (10), and the chemical phosphorus removal water outlet electromagnetic valve (17) is arranged on a pipeline between the online detector (15) and the chemical sedimentation tank (6); the online detector (15) is connected with the chemical dephosphorization water inlet electromagnetic valve (5), the biological dephosphorization water inlet electromagnetic valve (9), the biological dephosphorization water outlet electromagnetic valve (16) and the chemical dephosphorization water outlet electromagnetic valve (17).
3. The post-chemical dosing and biological combined optimized phosphorus removal device as claimed in claim 1 or 2, wherein: the biological phosphorus removal area (10) comprises a water distribution pipe (12), ecological fillers (13) and a water collection pipe (14), wherein the water distribution pipe (12), the ecological fillers (13) and the water collection pipe (14) are arranged into an underflow wetland from top to bottom, and aquatic plants are planted on the underflow wetland; the water outlet of the secondary sedimentation tank (2) is connected with the water distribution pipe (12) through a pipeline, and the water collecting pipe (14) is connected with the discharge pipeline through a pipeline.
4. The postposition chemical dosing and biological combined optimization phosphorus removal device of claim 3, which is characterized in that: an impermeable layer (11) is arranged in the biological phosphorus removal area (10), and the impermeable layer (11) is paved on the periphery of the subsurface flow wetland.
5. The postposition chemical dosing and biological combined optimization phosphorus removal device of claim 3, which is characterized in that: the aquatic plants are three-dimensionally matched thalictrum, reed, water lily and desmodium.
6. The postposition chemical dosing and biological combined optimization phosphorus removal device of claim 3, which is characterized in that: the ecological filler (13) comprises coarse aggregate crushed stone, ceramsite and cobblestone, and the coarse aggregate crushed stone, the ceramsite and the cobblestone are sequentially laid from top to bottom.
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