CN216639194U - Sewage treatment device integrating oxidation ditch, sedimentation tank and filtering tank - Google Patents

Abstract

The utility model discloses a sewage treatment device integrating an oxidation ditch, a sedimentation tank and a filtering tank, which comprises an oxidation ditch, a secondary sedimentation tank, a filtering tank and a disinfection tank, wherein the oxidation ditch is communicated with the sedimentation tank; the oxidation ditch comprises an anaerobic tank, an anoxic tank and an aerobic tank; an inner return flow door is arranged between the anoxic tank and the aerobic tank and is used for returning the mixed liquid in the aerobic tank to the anoxic tank. The utility model integrates the oxidation ditch, the secondary sedimentation tank, the filtering tank and the disinfection tank, and utilizes the sedimentation tank and the filtering tank which have chemical treatment and physical treatment functions in a synergic manner, so that the removal effect of organic matters, ammonia nitrogen, total phosphorus and total suspended matters in sewage can be greatly improved, the removal rate of the total nitrogen, the total phosphorus and the total suspended matters is especially improved, and the quality of effluent reaches the standard requirement.

Description

Sewage treatment device integrating oxidation ditch, sedimentation tank and filter tank

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment device integrating an oxidation ditch, a sedimentation tank and a filter tank.

Background

Under the current policy background of vigorously treating urban black and odorous water bodies, eliminating five types of inferior water bodies and improving the high standard of ecological water environment quality, the drainage standard requirements of a newly-built sewage treatment plant in many areas need to meet the strictest value of the national first-class standard (A standard) of pollutant emission standard of urban sewage treatment plants (GB18918-2002) and the IV-class standard of surface water environment quality standard (GB3838-2002), and the call of the quasi-IV-class water is very high. High-quality tail water enters surface water, and through the sewage disposal exchange after new water is supplemented, black and odorous water in a river channel can be eliminated more quickly. In order to reach the discharge standard, the indexes of the pollutants to be treated are total nitrogen, total phosphorus and total suspended matters, the indexes of the total nitrogen, the total phosphorus and the total suspended matters are difficult to reach the standard compared with the indexes of other pollutants, and the water quality of a received water area is directly influenced by the discharge of the pollutants. Therefore, the development of a sewage treatment device integrating an oxidation ditch, a sedimentation tank and a filtering tank, which can effectively control organic matters and ammonia nitrogen in sewage and mainly ensure that total nitrogen, total phosphorus and total suspended matters meet the discharge standard, is a necessary requirement for improving the environmental quality.

At present, the traditional technology mainly adopts an oxidation ditch, an MBR (membrane bioreactor), an SBR (sequencing batch reactor) process and a variant process thereof as a main process for secondary sewage treatment, wherein the oxidation ditch has obvious denitrification and dephosphorization effects, but the treatment effects of total suspended matters and total phosphorus are difficult to further improve; the MBR membrane bioreactor has good removal rate of total suspended matters, total nitrogen and total phosphorus, but has higher manufacturing cost, higher energy consumption and complex operation; the nitrogen and phosphorus removal effect of the sequencing batch bioreactor represented by SBR is difficult to meet the requirement of high emission standard. Therefore, how to select the process combination of sewage denitrification and dephosphorization which can stably reach the first class A and IV standards is a key technical problem.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a sewage treatment device integrating an oxidation ditch, a sedimentation tank and a filtering tank, which solves the traditional problems and can greatly improve the removal effect of organic matters, ammonia nitrogen, total phosphorus and total suspended matters in sewage so that the effluent meets the requirements of high discharge standards.

The utility model is realized by adopting the following technical scheme:

a sewage treatment device integrating an oxidation ditch, a sedimentation tank and a filtering tank comprises an oxidation ditch, a secondary sedimentation tank, a filtering tank and a disinfection tank which are sequentially communicated; the oxidation ditch comprises an anaerobic tank, an anoxic tank and an aerobic tank which are sequentially communicated; an inner return valve is arranged between the anoxic tank and the aerobic tank and used for returning the mixed liquid in the aerobic tank to the anoxic tank; the water outlet of the aerobic tank is connected with the inlet of the secondary sedimentation tank; the outlet of the secondary sedimentation tank is connected with the inlet of the sedimentation tank, the outlet of the sedimentation tank is connected with the inlet of the filter tank, and the outlet of the filter tank is connected with the inlet of the disinfection tank.

Preferably, the anaerobic tank is internally provided with a first stirrer, the anoxic tank is internally provided with a second stirrer, and the aerobic tank is internally provided with an aeration device.

Further preferably, the aeration device is a microporous aerator.

Preferably, the secondary sedimentation tank comprises a secondary sedimentation water inlet channel, a sedimentation area and a secondary sedimentation water outlet channel which are sequentially connected, and a mechanical mud scraping device is installed in the sedimentation area.

Preferably, the sedimentation tank comprises a mixing tank, a flocculation tank and a clarification tank which are connected in sequence; the mixing tank is provided with a first medicament adding device and a third stirrer; the flocculation tank is provided with a second medicament adding device and a fourth stirrer; and a central transmission mud scraper is arranged in the clarification tank.

Further preferably, an inclined pipe is installed at the top outlet of the clarification tank.

Further preferably, the sedimentation tank further comprises a clarification outlet channel communicated with the clarification tank, and an outlet of the clarification outlet channel is connected with an inlet of the filter tank.

Preferably, the filtering tank comprises a filtering water inlet channel, a filtering area and a filtering water outlet channel which are sequentially connected, and a precision filter with a filtering pore size smaller than 20 microns is arranged in the filtering area.

Further preferably, an automatic cleaning device is provided on the precision filter.

Preferably, an ultraviolet disinfection device is installed in the disinfection tank.

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

the sewage treatment device integrating the oxidation ditch, the sedimentation tank and the filtering tank integrates the oxidation ditch, the secondary sedimentation tank, the filtering tank and the disinfection tank, and utilizes the sedimentation tank and the filtering tank with chemical treatment and physical treatment functions in a synergistic manner, so that the removal effect of organic matters, ammonia nitrogen, total phosphorus and total suspended matters in sewage can be greatly improved, the removal rate of the total nitrogen, the total phosphorus and the total suspended matters is particularly improved, and the quality of effluent water reaches the class IV standard requirements in the national urban sewage treatment plant pollutant discharge standard (GB18918-2002) first-level standard (A standard) and the surface water environment quality standard (GB 3838-2002).

The utility model integrates the oxidation ditch, the sedimentation tank and the filter tank into a whole, and an internal reflux process is arranged in the oxidation ditch of the sewage treatment device, so that the total nitrogen is ensured to be effectively and biologically removed by providing sufficient anoxic tank capacity and internal reflux amount; and after the effluent of the oxidation ditch is precipitated by a secondary sedimentation tank, the effluent enters a subsequent sedimentation tank and a subsequent filtering tank for advanced treatment. Adding PAC and PAM into a mixing tank and a flocculation tank of a high-efficiency sedimentation tank to perform chemical sedimentation reaction on total phosphorus, thereby deepening the removal effect of the total phosphorus; an inclined pipe and a central transmission mud scraper are arranged in the clarification tank, and through the cooperation of the inclined pipe and the central transmission mud scraper, sediments can be effectively separated, and clear effluent is provided; in the filter tank, as the filter mesh has the filter aperture smaller than 20 microns, the total suspended matters in the sewage can be effectively intercepted, so that the effluent quality of the sedimentation tank can be well controlled, and the automatic cleaning device is also configured, so that the suspended matters intercepted on the filter mesh can be removed at any time, and the continuous filtering capacity of the filter mesh is maintained; the sewage passes through the efficient sedimentation tank and the efficient filtering tank, is then output after being disinfected and sterilized by the disinfection tank, and meets the standard discharge requirement.

The sewage treatment device integrating the oxidation ditch, the sedimentation tank and the filtering tank fully utilizes the principle of biological denitrification through the synergistic effect of multiple processes of the oxidation ditch, the secondary sedimentation tank, the filtering tank, the sterilizing tank and the like, realizes economic and efficient removal of total nitrogen indexes, is favorable for saving sewage treatment cost, and has the advantages of mature technology, high modularization degree, high automation degree, long service life, high cost performance and convenient operation and management.

Drawings

FIG. 1 is a schematic process diagram of a sewage treatment plant integrating an oxidation ditch, a sedimentation tank and a filtration tank;

FIG. 2 is an enlarged view of the oxidation ditch shown in FIG. 1;

FIG. 3 is an enlarged view of the secondary sedimentation tank shown in FIG. 1;

FIG. 4 is an enlarged view of the settling tank shown in FIG. 1;

FIG. 5 is an enlarged view of the filtration tank shown in FIG. 1;

fig. 6 is an enlarged view of the sterilization tank shown in fig. 1.

In the figure: 1. an oxidation ditch; 11. an anaerobic tank; 111. a first stirrer; 12. an anoxic tank; 121. a second agitator; 13. an aerobic tank; 131. an aeration device; 132. an internal return gate; 14. A water outlet pool;

2. a secondary sedimentation tank; 21. secondly, sinking the water into the ditch; 22. a settling zone; 221. a mechanical mud scraping device; 23. Secondary sinking out of the ditch;

3. a sedimentation tank; 31. a mixing tank; 311. a first medicament adding device; 312. a third stirrer; 32. a flocculation tank; 321. a second medicament adding device; 322. a fourth agitator; 33. A clarification tank; 331. an inclined tube; 332. a central transmission mud scraper; 34. clarifying a water outlet channel;

4. a filtration tank; 41. filtering the water inlet channel; 42. a filtration zone; 421. a precision filter; 422. An automatic cleaning device; 43. filtering the water outlet channel;

5. a disinfection tank; 51. an ultraviolet ray disinfection device.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and the detailed description below:

referring to fig. 1 to 6, a preferred sewage treatment apparatus integrating an oxidation ditch, a sedimentation tank and a filtration tank of the present invention comprises an oxidation ditch 1, a secondary sedimentation tank 2, a sedimentation tank 3, a filtration tank 4 and a disinfection tank 5, which are sequentially connected by pipes.

Referring to fig. 2, the oxidation ditch 1 includes an anaerobic tank 11, an anoxic tank 12 and an aerobic tank 13 which are sequentially communicated; the entry of anaerobism pond 11 is used for inserting sewage, oxygen deficiency pond 12 with be equipped with interior backward flow door 132 between the good oxygen pond 13, interior backward flow door 132 is used for making mixed liquid in the good oxygen pond 13 flows back to oxygen deficiency pond 12, and the reflux ratio is greater than 400% to ensure that total nitrogen obtains effectual biological removal. Wherein, the inner return gate 132 is a rotary inner return gate 132; the anaerobic tank 11 is internally provided with a first stirrer 111, the anoxic tank 12 is internally provided with a second stirrer 121, and the aerobic tank 13 is internally provided with an aeration device 131 for uniformly mixing sewage and sludge in the tank and flowing back, preventing sludge from settling, and maintaining the concentration of dissolved oxygen in the tank through the oxygen supply function of the aeration device 131. In one embodiment, the aeration device 131 is a micro-porous aerator. In another embodiment, the oxidation ditch 1 further comprises a water outlet tank 14 communicated with the aerobic tank 13, and the treated sewage is stabilized and flows to downstream treatment equipment.

Referring to fig. 3, the secondary sedimentation tank 2 includes a secondary sedimentation inlet channel 21, a sedimentation region 22 and a secondary sedimentation outlet channel 23 connected in sequence, an inlet of the secondary sedimentation inlet channel 21 is connected to an outlet of the oxidation ditch 1, and a mechanical sludge scraping device 221 is installed in the sedimentation region 22 for primarily settling the sewage and collecting the sewage through the mechanical sludge scraping device 221, so as to realize effective sludge-water separation.

Referring to fig. 4, the sedimentation tank 3 includes a mixing tank 31, a flocculation tank 32, a clarification tank 33 and a clarification outlet channel 34 connected in sequence, wherein an inlet of the mixing tank 31 is connected with an outlet of the secondary sedimentation tank 2; the mixing tank 31 is provided with a first medicament adding device 311 and a third stirrer 312, the first medicament adding device 311 is used for adding medicaments into the mixing tank 31, the medicaments are quickly mixed by the third stirrer 312 after being added, and then the medicaments and phosphate in the sewage undergo a chemical reaction to generate large flocs and then the large flocs enter the flocculation tank 32; the flocculation tank 32 is provided with a second medicament adding device 321 and a fourth stirrer 322 for adding PAM (polyacrylamide) for coagulation assistance, and after the administration, the floccules are combined to grow and compact after being slowly mixed by the stirrer, so that the floccules are more effectively precipitated to the bottom of the clarification tank 33; the center transmission mud scraper 332 is arranged in the clarification tank 33, the inclined tube 331 is arranged at the top outlet of the clarification tank 33, precipitates can be effectively separated, clear effluent is provided, and after the sludge is precipitated on the surface of the sludge, the sludge flows back into the clarification tank 33 through the inclined tube 331.

Referring to fig. 5, the filtering tank 4 includes a filtering inlet channel 41, a filtering area 42 and a filtering outlet channel 43, which are connected in sequence, an inlet of the filtering inlet channel 41 is connected to an outlet of the sedimentation tank 3, and a precision filter 421 having a filtering pore size smaller than 20 μm is installed in the filtering area 42, so that total suspended matters in the sewage can be effectively retained, and the effluent quality of the sedimentation tank 3 can be well controlled; the precision filter 421 is provided with an automatic cleaning device 422, which can remove suspended matters trapped on the filter screen at any time and maintain the continuous filtering capacity of the filter screen.

Referring to fig. 6, an ultraviolet disinfection device 51 is installed in the disinfection tank 5, so that the sewage can meet the standard discharge requirement after being disinfected. In other embodiments, the disinfection tank 5 can be equipped with other types of disinfection devices, and is not limited to ultraviolet disinfection.

The device provided by the utility model is used for treating sewage in a sewage treatment plant, the treatment capacity is 6 ten thousand tons/day, and the specific treatment method is as follows:

the sewage flows into the oxidation ditch 1 automatically, passes through the anaerobic tank 11, the anoxic tank 12 and the aerobic tank 13 in sequence, and the alternation of anaerobic state, anoxic state and aerobic state is favorable for the growth of different microorganism flora, and can remove pollutants such as organic matters, nitrogen, phosphorus and the like. The sewage stays for 1.6 hours after entering the anaerobic tank 11, and a submersible stirrer is arranged in the anaerobic tank 11 to ensure that the sewage and the mixed liquid returned by the anoxic tank 12 are uniformly mixed and prevent sludge from settling. Phosphorus accumulated in the sludge mass in the anaerobic tank 11 is released, but the released phosphorus can be absorbed by the sludge in the aerobic tank 13 again due to the phosphorus-rich absorption phenomenon in the aerobic state of the aerobic tank 13, and the purpose of removing the total phosphorus in the sewage can be achieved by removing the residual sludge. The sewage from the anaerobic tank 11 enters the anoxic tank 12, the effluent from the aerobic tank 13 passes through the internal reflux gate 132 to the anoxic tank 12, is uniformly mixed by the submersible stirrer in the anoxic tank 12, and stays in the anoxic tank 12 for treatment for 3.4 h. Because the mixed liquid in the anoxic tank 12 is in an anoxic state, the denitrification reaction is realized, most of the total nitrogen in the sewage can be removed, and the denitrification rate is 0.058kgNO₃-N/kgMLVSS · d. The sewage treated by the anoxic tank 12 enters an aerobic tank 13, the retention time of the aerobic tank 13 is 9.2 hours, and the sludge load is 0.076kg BOD₅(ii)/kgMLSS d; the aerobic tank 13 is internally provided with an aeration device 131 which is composed of a plurality of microporous aerators, air is provided by a blower, the air-water ratio is 5.7, the aerobic state ensures that organic matters and ammonia nitrogen are oxidized under the action of microorganisms, and the thorough oxidation of the ammonia nitrogen is the premise of fully carrying out denitrification reaction in the anoxic tank 12.

The sewage treated by the aerobic tank 13 is conveyed to a secondary sedimentation tank 2, the sewage enters a secondary sedimentation water inlet channel 21 and then is distributed to a sedimentation zone 22, and the surface load of the sedimentation zone 22 is 1.0m³/m²H, settling of the sludge with suspended matter under the action of gravity, mechanical scrapingThe device 221 collects water to realize effective mud-water separation; after precipitation, the upper clear water uniformly enters a secondary precipitation ditch 23 to be discharged.

Clear water discharged by the secondary sedimentation water channel 23 enters the efficient sedimentation tank 3, sewage firstly enters the mixing tank 31, the hydraulic retention time of the mixing tank 31 is 3 minutes, a PAC (polyaluminium chloride) adding system is arranged above the mixing tank 31, the concentration of PAC after adding medicine is 30mg/L, the sewage is rapidly mixed by the third stirrer 312 and then undergoes a chemical reaction with phosphate in the sewage, and large flocs are generated and then enter the flocculation tank 32; a PAM adding system is arranged at the upper end of the flocculation tank 32 and is used for adding PAM for coagulation assistance, the concentration of PAM after adding is 0.3mg/L, and the PAM is slowly mixed by a fourth stirrer 322 to enable the flocs to be integrally grown and compacted and to be more effectively precipitated to the bottom of the clarification tank 33, and the hydraulic retention time of the flocculation tank 32 is 8 minutes; the clarifier 33 is provided with an inclined tube 331 and a central transmission mud scraper 332, so that sediments can be effectively separated, and clear effluent is provided.

The play water of sedimentation tank 3 gets into filtration intake canal 41 of filtering ponds 4 and then enters filtration district 42, sets up the precision filter 421 that filter aperture is less than 20 microns filter screen in the filtration district 42, and remaining suspended solid is held back by the filter screen in the sewage, and total suspended solid index is more excellent, and filter screen internal configuration self-cleaning device 422 can clear away the suspended solid of holding back on the filter screen at any time, and the prevention is blockked up, keeps the filter capacity that the filter screen lasts. The filtered effluent enters the filtered raceway 43.

The effluent of the filter tank 4 enters a disinfection tank 5 adopting ultraviolet disinfection, and after disinfection, the effluent quality reaches IV-type standards in national first-class standard (A standard) of pollutant discharge Standard of municipal wastewater treatment plant (GB18918-2002) and Standard of surface Water Environment quality (GB3838-2002), and the specific indexes are as follows: CODcr is less than or equal to 30mg/L, BOD5 is less than or equal to 6mg/L, SS is less than or equal to 10mg/L, TP is less than or equal to 0.3mg/L, TN is less than or equal to 15mg/L NH3-N is less than or equal to 1.5mg/L, faecal coliform is less than or equal to 1000/L, and the faecal coliform is discharged after reaching the standard.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.

Claims (10)

1. A sewage treatment device integrating an oxidation ditch, a sedimentation tank and a filtering tank is characterized by comprising the oxidation ditch, a secondary sedimentation tank, the filtering tank and a disinfection tank which are sequentially communicated; the oxidation ditch comprises an anaerobic tank, an anoxic tank and an aerobic tank which are sequentially communicated; an inner return valve is arranged between the anoxic tank and the aerobic tank and used for returning the mixed liquid in the aerobic tank to the anoxic tank; the water outlet of the aerobic tank is connected with the inlet of the secondary sedimentation tank; the outlet of the secondary sedimentation tank is connected with the inlet of the sedimentation tank, the outlet of the sedimentation tank is connected with the inlet of the filter tank, and the outlet of the filter tank is connected with the inlet of the disinfection tank.

2. The integrated sewage treatment plant of claim 1 wherein the anaerobic tank is provided with a first agitator, the anoxic tank is provided with a second agitator, and the aerobic tank is provided with an aeration device.

3. The integrated sewage treatment plant of claim 2, wherein the aeration device is a micro-porous aerator.

4. The integrated sewage treatment plant of claim 1, wherein the secondary sedimentation tank comprises a secondary sedimentation water channel, a sedimentation area and a secondary sedimentation water channel which are connected in sequence, and a mechanical sludge scraping device is arranged in the sedimentation area.

5. The sewage treatment device integrating the oxidation ditch, the sedimentation tank and the filtering tank as a whole according to claim 1, wherein the sedimentation tank comprises a mixing tank, a flocculation tank and a clarification tank which are connected in sequence; the mixing tank is provided with a first medicament adding device and a third stirrer; the flocculation tank is provided with a second medicament adding device and a fourth stirrer; and a central transmission mud scraper is arranged in the clarification tank.

6. The integrated sewage treatment device with the oxidation ditch, the sedimentation tank and the filter tank as claimed in claim 5, wherein an inclined pipe is installed at the top outlet of the clarification tank.

7. The integrated wastewater treatment plant according to claim 5, wherein the sedimentation tank further comprises a clarification outlet channel communicated with the clarification tank, and an outlet of the clarification outlet channel is connected with an inlet of the filtration tank.

8. The integrated sewage treatment plant of claim 1, wherein the filtering tank comprises a filtering inlet channel, a filtering area and a filtering outlet channel which are connected in sequence, and a precision filter with a filtering pore size smaller than 20 microns is arranged in the filtering area.

9. The integrated sewage treatment plant of claim 8, wherein the precision filter is provided with an automatic cleaning device.

10. The integrated sewage treatment plant of claim 1, wherein an ultraviolet disinfection device is installed in the disinfection tank.

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