Intensive whole-process sewage treatment facility

Abstract

The utility model belongs to the technical field of sewage treatment, and provides an intensive full-process sewage treatment facility which integrates pretreatment, biochemical treatment and deep treatment and comprises a fine grid, a grit chamber, a biochemical tank, a rectangular secondary sedimentation tank, a sludge reflux pump tank, a coagulative precipitation tank and a disinfection water outlet tank. The biochemical tank comprises an anaerobic tank, an anoxic tank and an aerobic tank; the coagulative precipitation tank comprises a mixing tank, a magnetic powder mixing tank, a flocculation tank and an inclined tube precipitation tank; the coagulative precipitation tank adopts magnetic powder to assist flocculation, so that the treatment effect is greatly improved. The intensive full-process sewage treatment facility provided by the utility model has the characteristics of small occupied area, short process flow, excellent effluent quality and the like, and has obvious advantages for sewage treatment plants with limited land area and high effluent quality requirements.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewage treatment technical field, especially relate to a kind of intensive full-process sewage treatment facilities. BACKGROUND

[0002] In recent years, China has accelerated the pace of construction of sewage treatment facilities, and the number of sewage treatment plants has increased year by year. With the increasing demand for water environmental quality, the current sewage treatment plant discharge requirement has been upgraded to the first level A standard of GB18918-2002 "Urban Sewage Treatment Plant Pollutant Discharge Standard", and in environmentally sensitive areas, it also needs to meet the Class IV standard of GB3838-2002 "Surface Water Environmental Quality Standard". The Class IV standard has higher requirements for total phosphorus, ammonia nitrogen and organic matter removal.

[0003] Traditional sewage treatment process is long, and occupies a large area. Although MBR process is short, occupies less land, but the cost is high, the operation cost is high, and the management is complex. With the continuous gathering of urban population, the scale of city is gradually expanding, and the land resources in the core area of city are increasingly scarce, and the land of urban sewage plant is increasingly nervous, and the intensive arrangement of sewage treatment facilities is increasingly prominent.

[0004] Therefore, an intensive full-process sewage treatment facility is needed to reduce the land occupation of sewage treatment facilities. INVENTION CONTENTS

[0005] To solve the above technical problems, the utility model provides an intensive full-process sewage treatment facility, which comprises a fine grid and grit chamber, a biochemical tank, a rectangular secondary sedimentation tank, a sludge return pump pool, a coagulation sedimentation tank and a disinfection effluent tank. The fine grid and grit chamber are provided with a water inlet pipe, and the fine grid and grit chamber, the biochemical tank, the rectangular secondary sedimentation tank, the coagulation sedimentation tank and the disinfection effluent tank are sequentially connected by a pipe channel. The sludge return pump pool is connected with the rectangular secondary sedimentation tank and the biochemical tank through a channel.

[0006] Optionally, the fine grid and grit chamber are respectively provided with an inner inflow net plate grid cleaner and a cyclone sand separator, the inner inflow net plate grid cleaner is used for separating suspended garbage, and the cyclone sand separator is used for separating sand.

[0007] Optionally, the biochemical tank is sequentially connected by holes anaerobic tank, anoxic tank and aerobic tank, the anaerobic tank is provided with a submersible mixer, the anoxic tank is provided with a submersible flow inducer, the aerobic tank is provided with a microporous aerator, and the aerobic tank is provided with an internal reflux wall pump and an internal reflux channel connecting the end of the aerobic tank to the anoxic tank.

[0008] Optionally, the rectangular secondary sedimentation tank is provided with an inlet water distribution channel, a sedimentation tank, an outlet water channel, a sludge discharge groove, a sludge discharge channel, the sedimentation tank is provided with a chain plate type sludge and residue scraping machine, the sludge discharge channel is provided with a sludge discharge pipe and a sleeve valve connected with the sludge discharge groove, and the sludge discharge channel is communicated with the sludge return pump tank.

[0009] Optionally, the sludge return pump tank is provided with an external return wall penetrating pump, a residual sludge pump and an external return channel, and the external return channel is communicated with the anaerobic tank of the biochemical tank.

[0010] Optionally, the coagulation sedimentation tank is provided with a mixing tank, a magnetic powder mixing tank, a flocculation tank and an inclined tube sedimentation tank, the mixing tank is provided with a mixing stirrer, the magnetic powder mixing tank is provided with a magnetic mixing stirrer, the flocculation tank is provided with a flocculation stirrer, and the inclined tube sedimentation tank is provided with a center transmission sludge scraper and an inclined tube.

[0011] Optionally, the coagulation sedimentation tank is further provided with a sludge return slurry pump, a residual sludge slurry pump, a shearing machine and a magnetic separator, and the magnetic powder mixing tank is provided with a magnetic powder adding device.

[0012] Optionally, the disinfection outlet water tank is provided with an ultraviolet disinfection device.

[0013] Optionally, the inlet water distribution channel is provided with water distribution holes arranged along the channel.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The intensive full-process sewage treatment facility integrates pretreatment, biochemical treatment and advanced treatment, fully plays the biological denitrification and phosphorus removal effect while playing the physical and chemical effect, and can reach the discharge standard by cooperating with the excellent treatment effect of the magnetic medium coagulation sedimentation tank on total phosphorus and suspended solids and the sterilization effect of the disinfection tank.

[0016] The intensive full-process sewage treatment facility removes suspended garbage and sand through the pretreatment process of the fine grid and sand trap, avoids mud sedimentation in the biochemical pool operation process, and protects the normal operation of subsequent process equipment. The biochemical pool is provided with an anaerobic, anoxic and aerobic alternating process, which effectively removes nitrogen and phosphorus. An internal reflux pump is arranged to control the internal reflux amount according to the nitrogen removal requirement, so as to ensure the nitrogen removal effect. The rectangular secondary sedimentation tank adopts a week-in and week-out form, has strong impact load capacity, and can accept high hydraulic load. Compared with a circular radial flow sedimentation tank and a rectangular horizontal flow sedimentation tank, the rectangular secondary sedimentation tank occupies less land. The coagulation sedimentation tank adds coagulants, magnetic powders and flocculants in the mixing pool, the magnetic powder mixing pool and the flocculation pool respectively, so that the dissolved phosphorus is precipitated and the suspended matter is mixed and coagulated, the settling performance is improved, the total phosphorus and the suspended matter are effectively removed through the inclined pipe sedimentation of the inclined pipe sedimentation tank, the magnetic powder addition makes the alum flowers more easily formed, the specific gravity of the alum flowers is greatly increased, the settling speed is accelerated, the total phosphorus and the suspended matter removal effect are significantly improved, the inclined pipe sedimentation tank can accept more than 20m3 / (m2.h) of hydraulic load, the sludge flocculation after sedimentation is returned to the magnetic powder mixing pool by the reflux pump to improve the sedimentation effect and reduce the addition of reagents, and the sedimentation effluent can reach the surface water standard IV after disinfection, without the need of filtration process. Therefore, the process flow of the intensive full-process sewage treatment facility is shorter than that of the traditional process flow.

[0017] The intensive full-process sewage treatment facility adopts integrated intensive arrangement, integrates the pretreatment, biochemical treatment and advanced treatment, saves land compared with the traditional treatment technology, is suitable for the high discharge standard sewage treatment plant with land shortage, most of the holes or channels are used for flow between various process sections, the sewage flow process and the amount of pipe material are reduced, the flow hydraulic loss is reduced, the hydraulic elevation of each process section is reduced, so that the required lift of the sewage treatment and the required lift of the sludge reflux are reduced, and the operation energy consumption of the sewage treatment plant is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a lower layer schematic view of the intensive full-process sewage treatment facility of the utility model;

[0019] Figure 2 is a top layer schematic view of the intensive full-process sewage treatment facility of the utility model;

[0020] Figure 3 is a flow process schematic view of the intensive full-process sewage treatment facility of the utility model.

[0021] ILLUSTRATIVE DESCRIPTION

[0022] 1, fine grid and sand trap; 11, internal flow net plate grid cleaner; 12, cyclone sand trap;

[0023] 2, biochemical pool; 21, submersible agitator; 22, submersible flow inducer; 23, microporous aerator; 24, internal reflux wall-through pump; 25, biochemical pool effluent channel; 26, internal reflux channel;

[0024] 3, rectangular secondary sedimentation tank; 31, water distribution channel; 32, secondary sedimentation tank effluent channel; 33, chain plate type sludge and scum scraper; 34, sludge discharge tank; 35, sludge discharge pipe and sleeve valve; 36, sludge discharge channel;

[0025] 4, sludge reflux pump tank; 41, external reflux wall-through pump; 42, excess sludge pump; 43, external reflux channel;

[0026] 5, coagulation sedimentation tank; 51, mixing agitator; 52, magnetic mixing agitator; 53, flocculation agitator; 54, center transmission sludge scraper; 55, inclined pipe; 56, sludge reflux slurry pump; 57, excess sludge slurry pump; 58, shearing machine and magnetic separator; 59, magnetic powder adding device; 510, coagulation sedimentation tank effluent channel;

[0027] 6, disinfection effluent tank; 61, ultraviolet disinfection device. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clearly and clearly, the following will be further described in detail by combining with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0029] In the description of the utility model, it should be pointed out that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0030] In addition, in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements, it can be wireless connection, or wired connection. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the utility model described subsequently can be combined with each other as long as they do not conflict with each other.

[0032] Referring to Figures 1 to 3 , the utility model discloses intensive full-process sewage treatment facilities, including fine grid and grit chamber 1, biochemical pool 2, rectangular secondary sedimentation tank 3, sludge return pump pool 4, coagulation sedimentation tank 5, disinfection effluent tank 6. Through pipe and channel, fine grid and grit chamber 1, biochemical pool 2, rectangular secondary sedimentation tank 3, coagulation sedimentation tank 5, disinfection effluent tank 6 are communicated in proper order. Sludge return pump pool 4 is communicated with the anaerobic tank of rectangular secondary sedimentation tank 3 and biochemical pool 2 respectively through sludge discharge channel 36 and external return channel 43. Preferably, in the embodiment, sewage treatment facilities are arranged in two grid parallel form, making the operation of sewage plant more flexible and reliable.

[0033] Referring to Figures 1 to 3 , fine grid and grit chamber 1 are provided with inner inflow net plate grid cleaner 11 and cyclone grit chamber 12, and suspended garbage and grit are removed through mesh screen filtration and cyclone centrifugal action respectively, ensuring the normal operation of subsequent treatment processes, and the tail end of fine grid and grit chamber 1 is connected to biochemical pool 2 through a short pipe.

[0034] Referring to Figures 1 to 3 , the anaerobic tank, anoxic tank and aerobic tank are communicated in proper order in biochemical pool 2 through holes, and the alternation of anaerobic, anoxic and aerobic states is beneficial to the growth of different microbial flora, and removes organic matter, denitrification and phosphorus removal. The anaerobic tank adopts a complete mixing tank type, is provided with a submersible agitator 21, and the sludge is uniformly mixed with sewage through the stirring action, and sludge settlement is prevented. The anoxic tank adopts a closed loop tank type, is provided with a submersible flow inducer 22, the water flow rate is ensured to be above 0.25m / s through the flow induction action, so that the internal return liquid is fully mixed to quickly enter the anoxic state, which is beneficial to denitrification and prevents sludge settlement. The aerobic tank adopts a corridor tank type, is provided with a microporous aerator 23 and an internal return wall penetrating pump 24, the microporous aerator 23 mainly provides dissolved oxygen through aeration to provide microorganisms with organic matter and ammonia nitrogen nitrification in the aerobic decomposition, and air stirring is used to uniformly mix the sludge and water and prevent settlement. The internal return wall penetrating pump 24 is arranged at the tail end of the aerobic tank, sewage is lifted to the internal return channel 26 through the internal return wall penetrating pump 24, and is returned to the anoxic tank to provide the nitrate nitrogen required for denitrification, and the return flow can be accurately adjusted according to the denitrification requirement. The tail end of the aerobic tank is provided with a biochemical pool effluent channel 25, which is communicated with the water inlet distribution channel 31 of the rectangular secondary sedimentation tank 3. The water inlet distribution channel 31 is provided with water distribution holes (not shown) along the channel, and the water distribution holes are used to communicate the water inlet distribution channel 31 and the rectangular secondary sedimentation tank 3, so that the sewage of the water inlet distribution channel 31 flows into the rectangular secondary sedimentation tank 3.

[0035] Referring to Figure 1 , Figure 3A rectangular secondary sedimentation tank 3 is arranged with an inlet distribution channel 31, a sedimentation tank, and a secondary sedimentation tank outlet channel 32. A chain-plate scraper 33 is installed in the sedimentation tank to scrape the sludge settled to the bottom into a sludge discharge trough 34. The sludge discharge trough 34 is connected to the sludge discharge channel 36 via a sludge discharge pipe and a sleeve valve 35, allowing the sludge from the sludge discharge trough 34 to be transported to the sludge discharge channel 36 based on the liquid level difference between the sedimentation tank and the sludge discharge channel 36. The sludge discharge flow rate is controlled via the sludge discharge pipe and sleeve valve 35. The sludge discharge channel 36 is connected to a sludge return pump tank 4. The secondary sedimentation tank outlet channel 32 is connected to the mixing tank of the coagulation sedimentation tank 5 via a pipeline.

[0036] See Figure 1 , Figure 3 The sludge return pump tank 4 is connected to the sludge discharge channel 36 to receive sludge transported from the rectangular secondary sedimentation tank 3. An external return through-wall pump 41 transports the sludge to the external return channel 43, returning it to the anaerobic tank of the biological treatment tank 2 to ensure the sludge concentration in the biological treatment tank 2. The sludge return pump tank 4 also uses a waste sludge pump 42 to transport excess sludge to the sludge treatment facilities located within the plant area.

[0037] See Figures 1 to 3 The coagulation sedimentation tank 5 is sequentially connected to the mixing tank, magnetic powder mixing tank, flocculation tank, inclined tube sedimentation tank, and coagulation sedimentation tank effluent channel 510 via holes / channels. The mixing tank is equipped with a mixing mixer 51 and a coagulant dosing point. Mixing ensures uniform mixing of the agent and wastewater, and the suspended solids aggregate into smaller flocs through coagulation reaction. Chemical precipitation converts dissolved phosphorus into insoluble substances. The magnetic powder mixing tank is equipped with a magnetic mixing mixer 52 and a magnetic powder dosing device 59 to periodically replenish lost magnetic powder. Here, the wastewater is further agglomerated by the addition of magnetic powder and mixing, significantly increasing the floc density and making it easier to settle. The flocculation tank is equipped with a flocculation mixer 53 and a flocculant dosing point. The addition of flocculant and slow mixing cause the flocs to aggregate, grow, and become denser, resulting in better floc settling performance. An inclined tube 55 is installed at the top of the inclined tube sedimentation tank. This shallow-pool sedimentation principle increases the sedimentation area and reduces the interception velocity, thereby improving the sedimentation effect. Water flows upwards to the effluent channel 510 of the coagulation sedimentation tank, and the flocs slide down the wall of the inclined tube 55 to settle to the bottom of the inclined tube sedimentation tank. The inclined tube sedimentation tank is also equipped with a centrally driven scraper 54, which concentrates the settled flocs through scraping action. The coagulation sedimentation tank 5 is also equipped with a sludge return slurry pump 56, a waste sludge slurry pump 57, a shearing machine, and a magnetic separator 58. (See reference...) Figure 3The inlet of the sludge backflow residue slurry pump 56 is communicated with the bottom of the inclined tube sedimentation tank, and the sludge outlet pipe is communicated with the magnetic powder mixing tank, so that the concentrated sludge containing magnetic medium at the bottom is backflowed to the magnetic powder mixing tank, the flocculation performance of the sludge is fully utilized, the flocculation sedimentation effect is improved, and the reagent addition is reduced. The inlet of the residual sludge slurry pump 57 is communicated with the bottom of the inclined tube sedimentation tank, and the sludge outlet pipe is communicated with the shearing machine and the magnetic separator 58, so that the residual sludge is sheared into small size, the magnetic powder is recovered through the flow channel under the action of the internal magnetic field, the recovered magnetic powder is added to the magnetic powder mixing tank again, and the remaining separated sludge is transported to the sludge treatment facility arranged in the plant area. The water outlet channel 510 of the coagulation sedimentation tank is connected to the disinfection effluent tank 6 through a pipe channel or an orifice.

[0038] Referring to Figure 1 , Figure 3 The ultraviolet disinfection device 61 is arranged in the disinfection effluent tank 6, microorganisms in tail water are killed in a short time through ultraviolet light irradiation, and finally, the effluent water reaches the discharge standard.

[0039] The above-mentioned embodiments are only preferred embodiments of the utility model, and cannot be used to limit the range of protection of the utility model, and any non-substantial change and replacement made by the person skilled in the art on the basis of the utility model belongs to the range of protection required by the utility model.

Claims

1. An intensive, end-to-end wastewater treatment facility, characterized in that, The system includes a fine screen and grit chamber, a biological treatment tank, a rectangular secondary sedimentation tank, a sludge return pump tank, a coagulation sedimentation tank, and a disinfection effluent tank. The fine screen and grit chamber is equipped with an inlet pipe, which is connected to the fine screen and grit chamber, the biological treatment tank, the rectangular secondary sedimentation tank, the coagulation sedimentation tank, and the disinfection effluent tank in sequence through a pipe channel. The sludge return pump tank is connected to the rectangular secondary sedimentation tank and the biological treatment tank through a channel.

2. The integrated wastewater treatment facility as described in claim 1, characterized in that, The fine screen and sedimentation tank are respectively equipped with an internal inflow mesh screen cleaner and a cyclone sedimentation tank. The internal inflow mesh screen cleaner is used to separate suspended waste, and the cyclone sedimentation tank is used to separate sediment.

3. The integrated, end-to-end wastewater treatment facility as described in claim 1, characterized in that, The biochemical tank consists of an anaerobic tank, an anoxic tank, and an aerobic tank connected in sequence through holes. The anaerobic tank is equipped with a submersible mixer, the anoxic tank is equipped with a submersible flow promoter, and the aerobic tank is equipped with a microporous aerator. The end of the aerobic tank is equipped with an internal return through-wall pump and an internal return channel connecting the end of the aerobic tank to the anoxic tank.

4. The integrated wastewater treatment facility as described in claim 1, characterized in that, The rectangular secondary sedimentation tank is equipped with an inlet water distribution channel, a sedimentation tank, an outlet water channel, a sludge discharge trough, and a sludge discharge channel. The sedimentation tank is equipped with a chain plate type sludge scraper. The sludge discharge channel is equipped with a sludge discharge pipe and a sleeve valve connected to the sludge discharge trough. The sludge discharge channel is connected to the sludge return pump tank.

5. The integrated wastewater treatment facility as described in claim 1, characterized in that, The sludge return pump tank is equipped with an external return through-wall pump, a residual sludge pump, and an external return channel, which is connected to the anaerobic tank of the biological treatment tank.

6. The integrated wastewater treatment facility as described in claim 1, characterized in that, The coagulation sedimentation tank is equipped with a mixing tank, a magnetic powder mixing tank, a flocculation tank and an inclined tube sedimentation tank. The mixing tank is equipped with a mixing agitator, the magnetic powder mixing tank is equipped with a magnetic mixing agitator, the flocculation tank is equipped with a flocculation agitator, and the inclined tube sedimentation tank is equipped with a central drive sludge scraper and an inclined tube.

7. The integrated wastewater treatment facility as described in claim 6, characterized in that, The coagulation sedimentation tank is also equipped with a sludge return slurry pump, a residual sludge slurry pump, a shearing machine and a magnetic separator, and the magnetic powder mixing tank is equipped with a magnetic powder dosing device.

8. The integrated wastewater treatment facility as described in claim 1, characterized in that, The disinfection outlet pool is equipped with an ultraviolet disinfection device.

9. The integrated full-process wastewater treatment facility as described in claim 4, characterized in that, The water inlet distribution channel is provided with water distribution holes along the channel.

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