CN212833333U - Combined sewage treatment device - Google Patents
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- CN212833333U CN212833333U CN202021496579.2U CN202021496579U CN212833333U CN 212833333 U CN212833333 U CN 212833333U CN 202021496579 U CN202021496579 U CN 202021496579U CN 212833333 U CN212833333 U CN 212833333U
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Abstract
The utility model provides a combined type processing apparatus of sewage, which belongs to the technical field of sewage treatment, and the structure of the combined type processing apparatus comprises an upstream device and a downstream device, wherein the upstream device adopts an anaerobic aerobic reactor with at least two stages connected in series, the downstream device adopts a sequencing batch reactor with at least two stages connected in parallel, each stage of anaerobic aerobic reactor is connected in series by an anoxic tank and an aerobic tank, and the aerobic tank of the previous stage in the adjacent two stages of anaerobic aerobic reactors is connected in series with the anoxic tank of the next stage; the anaerobic aerobic reactor with the self-circulation aeration of the aerobic tank and the return of the pumping pipeline of the nitrifying liquid return pump is at least arranged in the first-stage anaerobic aerobic reactor; the downstream of the last anaerobic and aerobic reactor of the upstream device is connected in parallel with each stage of sequencing batch reactor of the downstream device through an upstream and downstream connecting pipeline; the sequencing batch reactor adopts a sedimentation tank. The whole system of the sequencing batch reactors connected in parallel ensures continuous water outlet; the upstream device and the downstream device are combined and connected to form a combined type sewage treatment device, the floor area is small, and the operation cost is low.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment technique and specifically relates to a combined type processing apparatus of sewage.
Background
Generally, the traditional activated sludge process is the most widely applied aerobic treatment process at present, but the process has the problems of low oxygen utilization rate, large sludge yield, low treatment load and worse treated effluent quality than a biomembrane process due to sludge expansion. For the technology that the quality of sewage is poor and the requirement of the subsequent advanced treatment of effluent of a biochemical system is high, the traditional activated sludge method cannot meet the current treatment requirement, and further research, development and improvement are urgently needed.
SUMMERY OF THE UTILITY MODEL
The technical task of the utility model is to solve the deficiencies of the prior art and provide a composite sewage treatment device.
The technical proposal of the utility model is realized in the following way that the sewage composite treatment device of the utility model structurally comprises an upstream device and a downstream device,
the upstream device adopts at least two stages of anaerobic and aerobic reactors connected in series,
the downstream device adopts at least two stages of sequencing batch reactors connected in parallel,
each stage of anaerobic aerobic reactor is connected in series with an anoxic tank and an aerobic tank, and the aerobic tank of the previous stage in the adjacent two stages of anaerobic aerobic reactors is connected in series with the anoxic tank of the next stage;
the upstream device is provided with a jet aerator in an aerobic tank of at least one stage of anaerobic and aerobic reactor, the jet aerator is arranged on a self-circulation aeration pipeline to carry out self-circulation aeration on the stage of aerobic tank, and the stage of aerobic section is connected to the stage of anaerobic tank in a backflow way through a nitrifying liquid backflow pump pumping pipeline; a nitrifying liquid reflux pump is arranged on the nitrifying liquid reflux pump pumping pipeline; the anaerobic aerobic reactor with the self-circulation aeration of the aerobic tank and the return of the pumping pipeline of the nitrifying liquid return pump is at least arranged in the first-stage anaerobic aerobic reactor;
a submersible stirrer is arranged in the anaerobic tank of each stage of anaerobic aerobic reactor,
an enzyme floating filler is configured in the middle upper layer space of the aerobic tank of each stage of anaerobic and aerobic reactor;
the downstream of the last anaerobic and aerobic reactor of the upstream device is connected in parallel with each stage of sequencing batch reactor of the downstream device through an upstream and downstream connecting pipeline;
the sequencing batch reactor adopts a sedimentation tank, and the middle upper layer space of the sedimentation tank is provided with an inclined plate or an inclined tube filler;
the space of the sedimentation tank above the inclined plate or the inclined tube packing layer is configured into a clear water area, and an overflow water outlet device is arranged at the liquid level of the clear water area; the sedimentation tank discharges clear water through an overflow water outlet device;
the space of the sedimentation tank below the inclined plate or the inclined tube packing layer is configured as a water distribution area,
the water distribution area is communicated with the clear water area through a channel space in an inclined plate or an inclined pipe packing,
the water distribution area is connected with an aerobic tank of an anaerobic and aerobic reactor of the last stage of the upstream process, which is communicated with the upstream and downstream connecting pipelines;
the bottom of the water distribution zone of the sedimentation tank of each stage of sequencing batch reactor is converged by a sludge pump pumping pipeline and flows back to the anaerobic tank of the first stage anaerobic and aerobic reactor of the upstream device;
a sludge pump is arranged on the sludge pump pumping pipeline.
An in-stage AO overflow weir is arranged between the top part of each stage of anaerobic aerobic reactor, which is connected with the aerobic tank, and sewage in the anaerobic tank overflows into the aerobic tank through the in-stage AO overflow weir.
The aerobic pool of the adjacent upper stage overflows and is connected in series with the anoxic pool of the adjacent lower stage through an interstage overflow weir which overflows downstream.
The main body of a jet aerator on a self-circulation aeration pipeline which is led to the outside of the tank body at the bottom of the aerobic tank is configured into a jet circulation pump, a pump-out pipe part of the jet circulation pump is arranged into an aeration pipe body, the upstream end of the aeration pipe body is provided with a liquid phase inlet, the downstream end of the aeration pipe body is provided with a mixed liquid jet outlet, the middle section of the aeration pipe body is arranged into a reducing section, and the side position of the aeration pipe body at the upstream of a mixing cavity of the reducing section is communicated with an;
the air inlet direction of the air inlet pipe and the upstream axial direction of the aeration pipe body are arranged in an acute angle slope shape;
the air in the air inlet pipe is introduced into the aeration pipe body by adopting low-pressure air,
under relatively low pressure, a mud-water mixture in the aerobic tank enters the jet aerator from the liquid phase inlet in the pumping incident flow aerator, low-pressure air is introduced into the air inlet pipe, wastewater containing biological sludge is contacted with air under a strong circulation state, and the air inlet of the air inlet pipe is designed in a slope shape, so that the inlet water is fully mixed with the air entering from the air inlet at a diameter-reducing section mixing cavity under lower pressure while the contact area is increased;
the mixed liquid jet outlet section adopts a diffusion pipe body with the pipe diameter gradually enlarged towards the downstream,
the diffusion pipe body with the pipe diameter gradually enlarged towards the downstream forms an oblique ejection outlet, so that gas-liquid bubbles form a secondary shearing channel at the oblique ejection outlet, the bubbles are prevented from merging and gathering, and the bubble quality and the oxygen utilization rate are improved.
The tail end of the self-circulation aeration pipeline returns to the bottom of the aerobic tank and is communicated with a tank bottom aeration distributor.
The tank space of the anoxic tank of each stage of anaerobic aerobic reactor is smaller than the tank space of the aerobic tank of the stage.
The bottom of the water distribution area of the sedimentation tank is provided with a sludge storage area.
The overflow water outlet device is arranged at the downstream end of the surface of the clear water area of the sedimentation tank, and adopts a plurality of rows of hole pipe water collectors or water outlet grooves which are communicated with the outside of the sedimentation tank through water outlet pipes.
A sludge distributor is arranged in a sludge storage area at the bottom of the water distribution area of the sedimentation tank.
The acute angle of the slope between the air intake direction of the air inlet pipe of the aeration pipe body and the upstream axial direction of the aeration pipe body is preferably 45 degrees.
The sedimentation tank adopts one or the combination of an inclined plate/inclined tube type sedimentation tank, a horizontal flow type sedimentation tank, a vertical flow type sedimentation tank and a radial flow type sedimentation tank.
Compared with the prior art, the utility model produced beneficial effect is:
the utility model discloses a combined type processing apparatus of sewage combines the advantage of biomembrane method on AO activated sludge process basis to the new technology of waste water treatment that has excellent characteristics such as system composition is simple, the operation is nimble and good reliability that biological reaction dynamics, static solid-liquid separation principle and reasonable water conservancy condition are developed as the basis. The advantages of the novel enzyme floating filler on separation are combined, the continuous flow secondary sedimentation tank with larger occupied area is optimized into an alternative water outlet sequence batch inclined plate sedimentation tank by adopting two sections of AO biochemical systems, the water quality of the outlet water is improved and the occupied area is saved by standing sedimentation and inclined plate filtration before the outlet water, and the method is particularly suitable for the wastewater treatment engineering with small occupied area and high treatment requirement. Simultaneously, the jet aerator of the independent utility model is applied to the O tank to greatly reduce the power consumption for treating sewage, thereby greatly reducing the water treatment cost.
The utility model discloses a combined type processing apparatus anterior segment of sewage mainly utilizes combined type continuous flow two-stage AO reactor, is to carry out sewage treatment in A/O technology and SBR technique are correlated with, adopts at least two-stage A/O technology back to connect the preface to criticize the separation to increase fixed enzyme in O1, O2 pond and preface criticize the pond and float the filler, consequently have biomembrane and activated sludge synergism and preface and criticize reaction, separation integration characteristic. The method creates good environmental conditions and hydraulic conditions for the growth and the propagation of various dominant microorganisms, so that the biochemical processes of degradation of high-difficulty organic matters, nitrification of ammonia nitrogen, denitrification and the like are kept in a high-efficiency reaction state, and the biochemical removal rate is effectively improved. Meanwhile, the jet aeration can improve the quality of bubbles and the utilization rate of oxygen. The method adopts a combined type conjoined structure, and has the advantages of small floor area, low operation cost and small amount of residual sludge.
The device has the following characteristics:
1) the process flow is simple, the civil engineering and investment are low, no secondary sedimentation tank is provided, the automation degree is high, meanwhile, the total amount of microorganisms in the biological tank consists of suspended activated sludge and biological membranes attached with organisms, the sludge concentration can reach more than 6000mg/L, even under the condition that the biological load is not increased, the system can bear higher volume load, the tank volume is far lower than that of the traditional biochemical treatment system, and the civil engineering land occupation and the investment are far lower than that of the traditional biochemical treatment process.
2) For the single-lattice sequencing batch sedimentation tank, water is discontinuously fed, but for the whole sequencing batch sedimentation tank, continuous water feeding and water discharging are realized, so that the whole process has continuous and uniform water discharging, and the operation and management are convenient;
3) the water level in the tank is basically constant, and the aerobic zone is in a normal aeration state, so that the utilization rate of the volume of the tank is increased, and the utilization rate of equipment is improved; the jet aeration ensures high conversion utilization rate of air oxygen and high volume load and sludge load. The system has the advantages that the impact load resistance of the system is improved due to the large circulation of the sludge and the wastewater, the system is more stable, and the sedimentation performance of the sludge is improved; meanwhile, due to the filling of the enzyme floating filler, secondary shearing and coalescence prevention systems are realized on bubbles released by jet aeration, and the mass transfer time of air, water and microorganisms is correspondingly prolonged; the filler intercepts the formed turbulent hydraulic shear, so that the bubbles are highly refined and uniformly dispersed, and the high conversion utilization rate of air oxygen in the system is determined. Sufficient dissolved oxygen is a condition to ensure high load operation of the aerobic biological treatment system, which is also an advantage of the composite process.
4) The solid-liquid separation effect is good, the output of the excess sludge is less, and the sludge treatment and disposal cost is reduced. The peeled biomembrane sludge contains more protozoan components and has larger specific gravity and larger individual sludge particles, so the peeled biomembrane sludge has good sludge settling performance and is easy for solid-liquid separation. The amount of the excess sludge is obviously reduced because the food chain in the biological membrane is longer, particularly, the biological membrane of the enzyme floating filler is thicker than that of the traditional biological membrane method, and the internal anaerobic bacteria can decompose part of the excess sludge synthesized in the aerobic process, thereby greatly reducing the total excess sludge.
5) The impact load resistance is strong, the process is equivalent to a complete mixing type reactor during water inlet, has strong diluting function, thus having strong impact load resistance and poison resistance, belongs to static precipitation during precipitation, has good precipitation condition, can accumulate higher sludge concentration in the reactor, and does not need a secondary precipitation tank;
6) good denitrification performance. The biochemical reaction area is filled with ionic enzymatic fillers, stable three-dimensional ecological potential combinations of different strains exist in the reactor, and the nitrification and denitrification processes can be organically combined and simultaneously carried out, so that the pH change of the system in the nitrification and denitrification process can be reduced, the requirements of the denitrification process on a carbon source and alkalinity can be reduced, the denitrification degree is high, and the effect is stable. Meanwhile, the process strengthens the denitrification process through a special anoxic reaction zone, and in addition, the sludge bed precipitated in the non-aeration stage of the sequencing batch sedimentation tank also has a certain denitrification effect, so that the system has a good denitrification effect;
7) according to the principle of biological reaction kinetics, a plurality of tanks are connected in series or in parallel to run, so that the sewage flows in the reactor to present an integral plug flow and a completely mixed complex flow state in different areas, thereby not only ensuring the stable treatment effect, but also improving the volume utilization rate.
8) The process adds inclined (60-75 degree angle) enzyme floating filler in the water outlet area at the rear end of the sequencing batch sedimentation tank to filter the water outlet and increase the separation area of the separation tank to reduce the separation surface load of the water outlet tank, thereby ensuring lower water outlet SS.
9) The sequencing batch tank device discharges water, is flexible to control, can effectively prevent surface scum and other suspended solids from entering a water outlet pipeline, and the reduction of the amount of the discharged suspended solids is an important premise for ensuring higher water quality of discharged water.
10) The jet aerator is applied to a water treatment system, the oxygen transfer efficiency can reach more than 30-35%, and the air demand during aeration can be greatly reduced, so that the power consumption during aeration is reduced, and compared with the traditional self-priming jet aerator and submerged aerator, the jet aerator improves the power efficiency by more than 1 time and is more energy-saving. By adopting a unique structural design, the pertinence that the microporous aerator widely adopted at present is easy to block is thoroughly eliminated, and the operation is stable and reliable; meanwhile, the method is suitable for various aerobic biological treatment processes, has shown great advantages in the oxidation ditch process, and can also be used for various processes such as SBR, various traditional and improved activated sludge processes, contact oxidation processes and the like. In particular, the system can be used in deeper tank types, and has the potential of further improving the oxygen transfer rate and reducing the occupied area.
The sedimentation tank of the utility model utilizes the laminar flow principle, thereby improving the processing capacity of the sedimentation tank; the inclined plate/inclined tube packing is utilized, so that the particle settling distance is shortened, and the settling time is shortened; the inclined plate/inclined tube packing also increases the sedimentation area of the sedimentation tank, thereby improving the treatment efficiency. The configuration of the inclined plates/inclined pipes forms an angle of 60 degrees with the horizontal plane, and the clear distance between the inclined plates (or the aperture of the inclined pipes) can be set to be 80-100 mm.
The utility model discloses an overflow rate of sedimentation tank is very high, exceeds 5 ~ 10 times than the throughput of general sedimentation tank, can realize high-efficient the sediment. The advantages are that: high removal rate, short retention time and small occupied area.
The utility model discloses a combined type processing apparatus of sewage is particularly useful for the processing of fine coal gasification sewage.
The utility model discloses a combined type processing apparatus of sewage reasonable in design, according to equipment structure simple, safe and reliable, convenient to use, the easy to maintain that technology disposes, have fine using value widely.
Drawings
FIG. 1 is a schematic diagram of the principle flow of the composite water treatment process of the present invention;
FIG. 2 is a schematic structural view of the jet aerator of the present invention;
fig. 3 is a schematic view of the working principle of the jet aerator of the present invention.
The reference numerals in the drawings denote:
1. the upstream device, 2, the downstream device,
3. an anaerobic and aerobic reactor, 4, a sequencing batch reactor,
5. a front anoxic tank, a front aerobic tank, a rear anoxic tank, a rear aerobic tank and a rear anoxic tank,
9. sewage 10, a jet aerator 11, a nitrifying liquid reflux pump 12, a submersible mixer 13 and enzyme floating filler,
14. a sedimentation tank, 15, an inclined plate or an inclined tube filler, 16, a clear water zone, 17, a water distribution zone, 18, an overflow water outlet device, 19, a sludge pump pumping pipeline,
20. a first sequencing batch sedimentation tank, 21, a second sequencing batch sedimentation tank,
22. an aeration pipe body is arranged on the aeration pipe body,
23. a liquid phase inlet 24, a mixed liquid jet outlet 25, a reducing section 26 and an air inlet pipe,
27. the design of the air inlet slope type is that,
28. a sludge pump, a sludge pump and a sludge pump,
29. a self-circulation aeration pipeline, a 30, a nitrifying liquid reflux pump pumping pipeline,
31. the upstream and the downstream are connected with a pipeline,
32. an intra-stage AO overflow weir, 33, an inter-stage overflow weir,
34. a jet circulation pump 35, a diffuser tube,
36. a sludge storage area for storing sludge,
37. a pool bottom aeration distributor, 38, a water outlet pipe,
39. a sludge distributor.
Detailed Description
The combined sewage treatment apparatus of the present invention will be described in detail below with reference to the accompanying drawings.
The utility model relates to a composite sewage treatment device, which comprises an upstream device 1 and a downstream device 2,
the upstream device 1 adopts at least two stages of anaerobic and aerobic reactors 3 which are connected in series,
the downstream device 2 adopts at least two stages of sequencing batch reactors 4 connected in parallel,
each stage of anaerobic aerobic reactor 3 is formed by connecting an anoxic tank and an aerobic tank in series, and the aerobic tank at the upper stage in the adjacent two stages of anaerobic aerobic reactors is connected with the anoxic tank at the lower stage in series;
the upstream device is provided with a jet aerator 10 in an aerobic tank of at least one stage of anaerobic and aerobic reactor, the jet aerator 10 is arranged on a self-circulation aeration pipeline 29 to carry out self-circulation aeration on the stage of aerobic tank, and the stage of aerobic section is connected with the stage of anaerobic tank in a backflow way through a nitrifying liquid backflow pump pumping pipeline 30; a nitrifying liquid reflux pump 11 is arranged on the nitrifying liquid reflux pump pumping pipeline 30; the anaerobic aerobic reactor with the self-circulation aeration of the aerobic tank and the return of the pumping pipeline of the nitrifying liquid return pump is at least arranged in the first-stage anaerobic aerobic reactor;
a submersible mixer 12 is arranged in the anaerobic tank of each stage of anaerobic aerobic reactor,
an enzyme floating filler 13 is arranged in the middle upper layer space of the aerobic tank of each stage of anaerobic and aerobic reactor;
the downstream of the last anaerobic and aerobic reactor of the upstream device is connected with each stage of sequencing batch reactor 4 of the downstream device in parallel through an upstream and downstream connecting pipeline 31;
the sequencing batch reactor 4 adopts a sedimentation tank 14, and the middle upper layer space of the sedimentation tank is provided with an inclined plate or an inclined tube filler 15;
the space of the sedimentation tank above the inclined plate or the inclined tube packing layer is configured into a clear water area 16, and an overflow water outlet device 18 is arranged at the liquid level of the clear water area; the sedimentation tank discharges clear water through an overflow water outlet device 18;
the space of the sedimentation tank below the inclined plate or the inclined tube packing layer is configured as a water distribution area 17,
the water distribution area is communicated with the clear water area through a channel space in an inclined plate or an inclined pipe packing,
the water distribution area is connected with an aerobic tank of an anaerobic and aerobic reactor of the last stage of the upstream process, which is communicated with the upstream and downstream connecting pipelines 31;
the bottom of the water distribution zone of the sedimentation tank of each stage of sequencing batch reactor is converged by a sludge pump pumping pipeline 19 and flows back to the anaerobic tank of the first stage anaerobic and aerobic reactor of the upstream device;
the sludge pump pumping pipeline is provided with a sludge pump 28.
An in-stage AO overflow weir 32 is arranged between the top parts of the anoxic tank and the aerobic tank of each stage of anaerobic aerobic reactor, and sewage in the anoxic tank overflows into the aerobic tank through the in-stage AO overflow weir 32.
The aerobic pool of the adjacent upper stage overflows and is connected in series with the anoxic pool of the adjacent lower stage through an interstage overflow weir 33 which overflows towards the downstream.
The main body of a jet aerator 10 on a self-circulation aeration pipeline 29 which is led to the outside of the tank body at the bottom of the aerobic tank is configured into a jet circulation pump 34, a pump-out pipe part of the jet circulation pump 34 is provided with an aeration pipe body 22, the upstream end of the aeration pipe body 22 is provided with a liquid phase inlet 23, the downstream end of the aeration pipe body is provided with a mixed liquid jet outlet 24, the middle section of the aeration pipe body is provided with a reducing section 25, and the side position of the aeration pipe body at the upstream of the mixing cavity of the reducing section is communicated with an air;
the air inlet direction of the air inlet pipe and the upstream axial direction of the aeration pipe body are arranged in an acute angle slope shape;
the air in the air inlet pipe is introduced into the aeration pipe body by adopting low-pressure air,
under relatively low pressure, a mud-water mixture in the aerobic tank enters the jet aerator from the liquid phase inlet in the pumping incident flow aerator, low-pressure air is introduced into the air inlet pipe, wastewater containing biological sludge is contacted with air under a strong circulation state, and the air inlet of the air inlet pipe is designed in a slope shape, so that the inlet water is fully mixed with the air entering from the air inlet at a diameter-reducing section mixing cavity under lower pressure while the contact area is increased;
the mixed liquid jet outlet section adopts a diffusion pipe body with the pipe diameter gradually enlarged towards the downstream,
the diffusion pipe body with the pipe diameter gradually enlarged towards the downstream forms an oblique ejection outlet, so that gas-liquid bubbles form a secondary shearing channel at the oblique ejection outlet, the bubbles are prevented from merging and gathering, and the bubble quality and the oxygen utilization rate are improved.
The jet outlet of the mixed liquid is communicated with the tail end of the self-circulation aeration pipeline and flows back to the bottom of the aerobic tank, and a tank bottom aeration distributor 37 is communicated with the bottom of the aerobic tank.
The tank space of the anoxic tank of each stage of anaerobic aerobic reactor is smaller than the tank space of the aerobic tank of the stage.
The bottom of the water distribution area of the sedimentation tank is provided with a sludge storage area 36.
The overflow outlet 18 is arranged at the downstream end of the surface of the clear water zone of the sedimentation tank, and is a water collector or outlet trough with a plurality of rows of perforated pipes, which is communicated with the outside of the sedimentation tank through an outlet pipe 38.
A sludge distributor 39 is arranged in the sludge storing area at the bottom of the water distribution area of the sedimentation tank.
The acute angle of the slope between the air intake direction of the air inlet pipe of the aeration pipe body and the upstream axial direction of the aeration pipe body is preferably 45 degrees.
The sedimentation tank 14 is one or a combination of an inclined plate/inclined tube type sedimentation tank, a horizontal flow type sedimentation tank, a vertical flow type sedimentation tank and a radial flow type sedimentation tank.
The utility model discloses a process technology route that combined type processing apparatus of sewage matches is corresponding for upper reaches technology and low reaches technology, and the anaerobic aerobic reactor that the upper reaches technology adopted at least two-stage series connection, and the low reaches technology adopts the parallelly connected preface batch reactor of at least two-stage, and sewage enters anaerobic section first in the anaerobic aerobic reactor of each grade, reentries aerobic section, then reentries next grade anaerobic aerobic reactor; the downstream of the last anaerobic and aerobic reactor of the upstream process is connected with each stage of sequential batch reactor of the downstream process in parallel.
The upstream process is preferably an anaerobic and aerobic reactor with two stages connected in series, and the downstream process is preferably a sequencing batch reactor with two stages connected in parallel.
The aerobic section of the anaerobic aerobic reactor is provided with a jet aerator, the sludge-water mixture in the aerobic section of the anaerobic aerobic reactor is in contact with air in a strong circulation state by pumping the incident flow aerator under relatively low pressure, and the slope design of an air inlet increases the contact area and simultaneously leads the inlet water to be fully mixed with the air entering the air inlet under lower pressure, thereby reducing the energy consumption;
the slope design of the air inlet adopts the design of the oblique jet orifice, so that the bubbles are secondarily sheared at the discharge port, the coalescence of the bubbles is effectively prevented, and the quality and the oxygen utilization rate of the bubbles are improved;
the slope type air inlet direction of the air inlet pipe and the axis of the outer pipe are arranged in an acute angle, so that the turbulence degree of water flow is reduced, the head loss of the inner part is reduced, the energy consumption of the system is reduced, and meanwhile, water vapor can be fully mixed.
The process is based on an AO activated sludge process, arranges hydraulic conditions by a biological reaction kinetics and static solid-liquid separation method, utilizes an enzyme floating filler combined biomembrane method, adopts two sections of AO biochemical systems and then optimizes a continuous flow secondary sedimentation tank with larger occupied area into a sequence batch inclined plate sedimentation tank with alternative water outlet, improves the water quality of the outlet water and saves the occupied area by standing sedimentation and inclined plate filtration before the outlet water, and simultaneously adopts a jet aerator to aerate in an aerobic O tank to reduce the power consumption for treating sewage and reduce the water treatment cost.
The process adopts a two-stage A/O process and then sequential batch separation, and fixed enzyme floating fillers are added in an O1 pool, an O2 pool and a sequential batch pool, so that the process has the characteristics of synergism of a biological membrane and activated sludge and integration of sequential batch reaction and separation.
The two-section A/O process adopts a prepositive anoxic tank, a prepositive aerobic tank, a postpositive anoxic tank and a postpositive aerobic tank which are connected in series in sequence,
the sewage introduced at the upstream of the process, the returned sludge of the sequencing batch sedimentation tank and the returned mixed liquid of the preposed aerobic tank are mixed together and enter the preposed anoxic tank, and nitrate nitrogen is provided from the preposed aerobic tank to a return system of the preposed anoxic tank for denitrification reaction;
the effluent of the preposed anoxic tank enters a preposed aerobic tank, most organic matters are removed through aeration and nitration reaction is realized, because the preposed aerobic tank realizes synchronous nitration and denitrification reaction by immobilized enzyme floating filler, more than 80 percent of total nitrogen is removed in the first section of A/O, the preposed aerobic effluent enters a postpositional anoxic tank, the residual nitrate nitrogen is removed through denitrification reaction at the position, and the effluent enters a postpositional aerobic tank to further degrade the residual organic matters;
the effluent of the post-positioned aerobic zone flows into the first sequencing batch sedimentation tank or the second sequencing batch sedimentation tank, and the working time sequence of the two tanks is as follows:
if the first sequencing batch sedimentation tank is used as the effluent of the sedimentation tank, the second sequencing batch sedimentation tank is in an aeration aerobic or sedimentation state;
if the effluent of the first sequencing batch sedimentation tank is switched to an aerated aerobic or sedimentation state from the sedimentation tank, the effluent of the second sequencing batch sedimentation tank is switched to the effluent of the sedimentation tank from the aerated aerobic or sedimentation state;
the working conditions of the first sequencing batch sedimentation tank and the second sequencing batch sedimentation tank are alternately arranged to ensure the continuous water outlet of the whole sequencing batch sedimentation tank system;
the sludge in the first and second sequencing batch sedimentation tanks flows back to the preposed anoxic tank through the sludge pump, the sludge backflow is used for strengthening the denitrification efficiency of the whole system and the balance of sludge concentration, and the backflow amount of the system can be changed by adjusting the nitrification liquid backflow pump at a variable speed according to the required denitrification efficiency.
The excess sludge in the first and second sequencing batch sedimentation tanks is discharged from the sequencing batch sedimentation tank and directly sent into a biochemical sludge tank for treatment.
The aerobic aeration in the preposed aerobic tank and/or the post-aerobic tank adopts a jet aerator.
The utility model discloses a combined type processing apparatus flow brief introduction of sewage: the sewage enters a preposed anoxic zone of a biochemical water treatment tank, is mixed with the returned sludge of the sequencing batch sedimentation tank and the returned mixed liquid of the preposed aerobic zone, and nitrate nitrogen is provided from the preposed aerobic zone to a return system of the preposed anoxic zone for denitrification reaction. The effluent of the preposed anoxic tank enters a preposed aerobic tank, most organic matters are removed through aeration to realize nitration reaction, synchronous nitration and denitrification reaction are also realized due to the existence of immobilized enzyme floating filler, more than 80% of total nitrogen is removed in the first section of A/O, the preposed aerobic effluent enters a postpositional anoxic zone, the residual nitrate nitrogen is removed through denitrification reaction at the position, and the effluent enters a postpositional aerobic zone to further degrade the residual organic matters. The effluent of the post aerobic zone flows into the first sequencing batch sedimentation tank or the second sequencing batch sedimentation tank. If the first sequencing batch sedimentation tank is used as the sedimentation tank to discharge water, the second sequencing batch sedimentation tank is in an aeration aerobic or sedimentation state, sludge in the sequencing batch sedimentation tank flows back to the preposed anoxic zone through a sludge pump, the sludge backflow is used for strengthening the denitrification efficiency of the whole system and the balance of sludge concentration, and the backflow amount of the system can be changed by adjusting the backflow pump in a variable speed manner according to the required denitrification efficiency. The residual sludge is discharged from the sequencing batch sedimentation tank and is directly sent into a biochemical sludge tank.
The working phase periods of the two sequencing batch reaction separation tanks are shown in the following table 1:
working period schematic table of sequencing batch reaction separation tank
The utility model discloses a combined type processing apparatus configuration of sewage:
(1) the system comprises 2 groups, each group consists of a preposed anoxic tank, a preposed aerobic tank, a postposed anoxic tank, a postposed aerobic tank and two sequencing batch sedimentation tanks, sewage automatically flows into the preposed aerobic tank from the preposed anoxic tank, then flows through the postposed anoxic tank and the postposed aerobic tank from the preposed anoxic tank, finally flows into the sequencing batch sedimentation tanks, and is precipitated by the two sequencing batch sedimentation tanks alternately to obtain effluent which automatically flows to a second-stage coagulating sedimentation tank;
(2) the front aerobic pool is provided with 8 circulating jet pumps and jet devices, the rear aerobic pool is provided with 4 circulating jet pumps and jet devices, and a roots blower provides an air source for aerobic aeration in the pool. The preposed anoxic pond and the postpositive anoxic pond are provided with submersible mixers for stirring;
(3) an oxygen dissolving instrument is arranged in the aerobic tank, and the air inflow is adjusted by observing the oxygen dissolving instrument, so that the concentration of dissolved oxygen in the tank is ensured to be 2-3.5 mg/L;
(4) the process control is carried out by adjusting the sludge load, the sludge age or the sludge concentration and the like;
(5) the preposed aerobic tank is provided with nitrifying liquid reflux, and nitrifying liquid is refluxed to the preposed anoxic zone by a nitrifying liquid reflux pump so as to realize the removal of nitrogen; the sludge flows back to the preposed anoxic tank from the sequencing batch sedimentation tank through a sludge discharge pump to ensure a certain amount of sludge in the tank;
(6) and the two grid sequencing batch sedimentation tanks in each group alternately operate to ensure the continuous water outlet of the whole system. The operation sequence of each cell is controlled by a time relay, and each operation period is 4 hours (80 minutes aeration, 40 minutes standing and precipitation, 2 hours water outlet);
(7) the outlet water of the sequencing batch sedimentation tank is automatically controlled by a PLC, and the aeration section comprises: the aeration valve is opened, the emptying valve of the water outlet system is closed, and the air inlet valve is controlled by the pressure sensor to ensure that certain air pressure exists in the water outlet system to form an air seal. A water outlet section: the aeration valve is closed, the emptying valve of the water outlet system is opened, the air inlet valve is closed, the air seal in the water outlet system is damaged, and water can be stably discharged.
A jet aerator:
under relatively low pressure, the sludge-water mixture in the aerobic aeration tank is contacted with the air by the liquid phase inlet in the pumping incident flow aerator under a strong circulation state, and the special slope-shaped design of the air inlet increases the contact area and simultaneously leads the inlet water to be fully mixed with the air entering the air inlet under lower pressure, so the energy consumption of the sludge-water mixture is far less than that of the traditional jet aerator; in addition, the oblique jet outlet design enables the bubbles to be subjected to secondary shearing at the discharge port, so that the coalescence of the bubbles is effectively prevented, and the quality of the bubbles and the oxygen utilization rate are improved.
The air inlet direction of the air inlet pipe and the axis of the outer pipe are arranged in an acute angle. The acute angle of 45 degrees sets up, can make rivers turbulent flow degree minimum, and inside head loss is minimum, and the system energy consumption is minimum, and steam can obtain better mixture simultaneously. Table 2 main technical parameters of air-supply type low-pressure jet aeration:
air supply type low-pressure jet aeration main technical parameters
| Efficiency of | ％ | 30～35 | |
| Power efficiency | KgO2/kw.h | 4.2-4.8 | |
| Loss of resistance | Pa | ≥3000 |
In the jet aerator, water is atomized into fog beads with extremely small diameters, and oxygen in the air is quickly and effectively transferred to a liquid phase and a biological phase to finish the quick transfer process of the oxygen. The oxygen transfer efficiency under the standard state is as high as 30-35%, and the biochemical reaction rate is greatly improved and is far higher than that of the aeration element commonly used at present. The power consumption of the system is a considerable advantage even when compared to the more advanced aeration elements currently used, and can significantly reduce the investment and operating costs of wastewater treatment.
The principle is as follows: the gas is cut into tiny bubbles to form an oxygen-enriched gas-liquid mixture, and the gas-liquid interlaced turbulent flow is horizontally ejected. The gas-liquid mixture has the energy of horizontal and vertical direction simultaneously, produces intensive mixture in the pond to carry the liquid of wrapping up on every side and flow forward, under the dual function of horizontal direction power and vertical direction gaseous floating power, form holistic mixture and circulation.
The design greatly enhances the mass transfer rate of gas between liquid and solid phases through strong turbulent mixing and diffusion, thereby further improving the oxygen transfer rate, greatly improving the power efficiency and greatly improving the dissolved oxygen rate; meanwhile, the problem of blockage of other common aerators is solved. The equipment also has the outstanding advantages of durability, simple pipeline layout, convenient installation and maintenance, small maintenance amount, low investment and operation cost and the like.
The utility model discloses application example one:
the composite process is used for treating the pulverized coal gasification sewage, and the design treatment capacity is 260m3Perh, the water inflow of the gasification sewage is about 200 and 240m in normal operation3H, temperature 44-46 ℃, COD800-900mg/L，NH3180mg/L of-N100, after treatment, the COD is 10-35mg/L, NH3the-N is 0.5-1.8mg/L, which meets the COD of the sewage discharged outside<40mg/L,NH3-N<2 mg/L.
The utility model discloses application example two:
the gasification slag water is treated by the combined type process sewage, and the design scale is determined to be 200m3/h, 150-3H, COD of effluent after treatment<40mg/L，NH3-N<2mg/L, all meet the requirement of sewage discharge.
The utility model discloses a jet aerator adopts air feed formula jet aerator, and the air feed formula is seen with the comparison of traditional aeration mode and is attached table 3:
compared with a large amount of field operation data, the low-pressure air supply type jet aerator is superior to other forms of aerators in oxygen transfer efficiency and power efficiency.
In the utility model, "O" in AO and A/O is letter O; "0" in O1, O2 is the letter O.
AO is the abbreviation of anaerobic Oxic, AO technology is also called anaerobic aerobic technology, A (anaerobic) is anaerobic section, used for removing nitrogen and phosphorus; o (oxic) is an aerobic section for removing organic matter from water. Its advantages are degradation of organic pollutant, and certain function of removing nitrogen and phosphorus.
Claims (10)
1. The composite sewage treating apparatus includes one upstream unit and one downstream unit,
the upstream device adopts at least two stages of anaerobic and aerobic reactors connected in series,
the downstream device adopts at least two stages of sequencing batch reactors connected in parallel,
each stage of anaerobic aerobic reactor is connected in series with an anoxic tank and an aerobic tank, and the aerobic tank of the previous stage in the adjacent two stages of anaerobic aerobic reactors is connected in series with the anoxic tank of the next stage;
the upstream device is provided with a jet aerator in an aerobic tank of at least one stage of anaerobic and aerobic reactor, the jet aerator is arranged on a self-circulation aeration pipeline to carry out self-circulation aeration on the stage of aerobic tank, and the stage of aerobic section is connected to the stage of anaerobic tank in a backflow way through a nitrifying liquid backflow pump pumping pipeline; a nitrifying liquid reflux pump is arranged on the nitrifying liquid reflux pump pumping pipeline; the anaerobic aerobic reactor with the self-circulation aeration of the aerobic tank and the return of the pumping pipeline of the nitrifying liquid return pump is at least arranged in the first-stage anaerobic aerobic reactor;
a submersible stirrer is arranged in the anaerobic tank of each stage of anaerobic aerobic reactor,
an enzyme floating filler is configured in the middle upper layer space of the aerobic tank of each stage of anaerobic and aerobic reactor;
the downstream of the last anaerobic and aerobic reactor of the upstream device is connected in parallel with each stage of sequencing batch reactor of the downstream device through an upstream and downstream connecting pipeline;
the sequencing batch reactor adopts a sedimentation tank, and the middle upper layer space of the sedimentation tank is provided with an inclined plate or an inclined tube filler;
the space of the sedimentation tank above the inclined plate or the inclined tube packing layer is configured into a clear water area, and an overflow water outlet device is arranged at the liquid level of the clear water area; the sedimentation tank discharges clear water through an overflow water outlet device;
the space of the sedimentation tank below the inclined plate or the inclined tube packing layer is configured as a water distribution area,
the water distribution area is communicated with the clear water area through a channel space in an inclined plate or an inclined pipe packing,
the water distribution area is connected with an aerobic tank of an anaerobic and aerobic reactor of the last stage of the upstream process, which is communicated with the upstream and downstream connecting pipelines;
the bottom of the water distribution zone of the sedimentation tank of each stage of sequencing batch reactor is converged by a sludge pump pumping pipeline and flows back to the anaerobic tank of the first stage anaerobic and aerobic reactor of the upstream device;
a sludge pump is arranged on the sludge pump pumping pipeline.
2. The combined type sewage treatment device according to claim 1, wherein:
an in-stage AO overflow weir is arranged between the top part of each stage of anaerobic aerobic reactor, which is connected with the aerobic tank, and sewage in the anaerobic tank overflows into the aerobic tank through the in-stage AO overflow weir.
3. The combined type sewage treatment device according to claim 1, wherein:
the aerobic pool of the adjacent upper stage overflows and is connected in series with the anoxic pool of the adjacent lower stage through an interstage overflow weir which overflows downstream.
4. The combined type sewage treatment device according to claim 1, wherein:
the main body of a jet aerator on a self-circulation aeration pipeline which is led to the outside of the tank body at the bottom of the aerobic tank is configured into a jet circulation pump, a pump-out pipe part of the jet circulation pump is arranged into an aeration pipe body, the upstream end of the aeration pipe body is provided with a liquid phase inlet, the downstream end of the aeration pipe body is provided with a mixed liquid jet outlet, the middle section of the aeration pipe body is arranged into a reducing section, and the side position of the aeration pipe body at the upstream of a mixing cavity of the reducing section is communicated with an;
the air inlet direction of the air inlet pipe and the upstream axial direction of the aeration pipe body are arranged in an acute angle slope shape;
the air in the air inlet pipe is introduced into the aeration pipe body by adopting low-pressure air,
under relatively low pressure, a mud-water mixture in the aerobic tank enters the jet aerator from the liquid phase inlet in the pumping incident flow aerator, low-pressure air is introduced into the air inlet pipe, wastewater containing biological sludge is contacted with air under a strong circulation state, and the air inlet of the air inlet pipe is designed in a slope shape, so that the inlet water is fully mixed with the air entering from the air inlet at a diameter-reducing section mixing cavity under lower pressure while the contact area is increased;
the mixed liquid jet outlet section adopts a diffusion pipe body with the pipe diameter gradually enlarged towards the downstream,
the diffusion pipe body with the pipe diameter gradually enlarged towards the downstream forms an oblique jet outlet, so that gas-liquid bubbles form a secondary shearing channel at the oblique jet outlet;
the tail end of the self-circulation aeration pipeline returns to the bottom of the aerobic tank and is communicated with a tank bottom aeration distributor.
5. The combined type sewage treatment device according to claim 1, wherein:
the tank space of the anoxic tank of each stage of anaerobic aerobic reactor is smaller than the tank space of the aerobic tank of the stage.
6. The combined type sewage treatment device according to claim 1, wherein: the bottom of the water distribution area of the sedimentation tank is provided with a sludge storage area.
7. The combined type sewage treatment device according to claim 1, wherein: the overflow water outlet device is arranged at the downstream end of the surface of the clear water area of the sedimentation tank, and adopts a plurality of rows of hole pipe water collectors or water outlet grooves which are communicated with the outside of the sedimentation tank through water outlet pipes.
8. The combined type sewage treatment plant according to claim 6, characterized in that:
a sludge distributor is arranged in a sludge storage area at the bottom of the water distribution area of the sedimentation tank.
9. The combined type sewage treatment device according to claim 4, wherein:
the acute angle of the slope between the air intake direction of the air inlet pipe of the aeration pipe body and the upstream axial direction of the aeration pipe body is preferably 45 degrees.
10. The combined type sewage treatment device according to claim 1, wherein:
the sedimentation tank adopts one or the combination of an inclined plate/inclined tube type sedimentation tank, a horizontal flow type sedimentation tank, a vertical flow type sedimentation tank and a radial flow type sedimentation tank.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114105295A (en) * | 2021-11-01 | 2022-03-01 | 安徽佰齐环保工程有限公司 | Continuous flow sewage mixture treatment system and method |
| CN114105295B (en) * | 2021-11-01 | 2024-01-16 | 安徽佰齐环保工程有限公司 | Continuous flow sewage mixture treatment system and method |
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