CN110697897A

CN110697897A - Sewage treatment device and treatment process based on suspended filler biofilm technology

Info

Publication number: CN110697897A
Application number: CN201911144857.XA
Authority: CN
Inventors: 辛刚; 张立伟; 杨伟朋; 石泰纳·丹尼尔森
Original assignee: Shandong Youwei Environmental Protection Service Co Ltd
Current assignee: Shandong Youwei Environmental Protection Service Co Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-01-17

Abstract

The invention discloses a sewage treatment device based on a suspended filler biomembrane technology, which comprises an aerobic reactor and a facultative reactor; the aerobic reactor comprises an aerobic tank, an aerobic filler system is filled in the aerobic tank, and an aeration stirring device for aerating and stirring water quality in the aerobic tank is arranged in the aerobic tank; the facultative reactor comprises a facultative tank, a facultative filler system is filled in the facultative tank, and a stirring and flushing device for stirring sewage and filler in the facultative tank and flushing suspended matters accumulated on the surface of the filler and aged biological membranes is arranged on the facultative tank; the invention has no sludge bulking phenomenon, no sludge backflow, no secondary sedimentation tank system at the rear end effluent, small floor area, high volume load, good treatment effect, impact load resistance, convenient operation and maintenance and the like.

Description

Sewage treatment device and treatment process based on suspended filler biofilm technology

Technical Field

The invention relates to a sewage treatment device and a sewage treatment process, in particular to a sewage treatment device and a sewage treatment process based on a suspended filler biological membrane technology, which have the advantages of small occupied area, high volume load, good sewage treatment effect, impact load resistance and convenience in operation and maintenance, and belongs to the technical field of wastewater treatment.

Background

In recent years, with the urbanization process and the high-speed economic development of China, the water environment pollution is increasingly serious, a large amount of domestic and industrial sewage flows into rivers, lakes or underground water to cause serious pollution to water bodies, and the influence is generated on fishery water, domestic water and the like, so that the water resource shortage caused by the pollution is one of important restriction factors for sustainable development and progress of the economy and the society of China, in order to improve the conditions of water pollution and water resource deficiency, China invests a large amount of manpower and material resources, and a large amount of sewage treatment plants are constructed to treat the sewage, so that the primary effect is obtained.

At present, sewage is treated by a biological method with better economy at home and abroad, such as SBR (Sequencing Batch Reactor Activated Sludge Process), A/O (aerobic/Oxic), A2/O (Anaerobic/aerobic/Oxic), biological contact oxidation and other treatment processes; the traditional sewage treatment processes such as SBR, A/O, A2/O, biological contact oxidation and the like have the problems of large occupied area, low volume load, complex process flow, easy impact load, easy sludge expansion, high construction and operation cost and the like, and have the defects of poor ammonia nitrogen and total nitrogen removal effect, unstable effluent quality and incapability of meeting the national first-level A discharge standard, so that advanced treatment must be carried out on second-level biochemical effluent of a sewage treatment plant to ensure that the final effluent meets the discharge standard.

Aiming at the problems in the sewage treatment process, the MBBR (Moving Bed Bio-film Reactor) which has high treatment efficiency and compact layout and can realize the wastewater treatment in a limited space is presented at present.

The MBBR technology is that suspended filler is added into an activated sludge aeration tank as a carrier for the attachment growth of microorganisms, so that the mechanism and the efficiency of sewage treatment are greatly changed; in the system, the basic environment of the existing microorganism is changed into three phases of gas, liquid and solid from the original two phases of gas and liquid, and the change into the microorganism creates more abundant existing forms to form a more complex compound ecological system; the biological film on the surface of the carrier and the suspended sludge in the liquid phase play a role together, and respectively play own degradation advantages, a large amount of biological films which are adsorbed and grown on the biological filler greatly increase the active biomass in the biological pool, and different from the traditional fillers, the suspended filler can frequently contact with sewage for multiple times, so the biological film is called as a 'moving biological film'.

The core part of the MBBR technology lies in that suspended fillers with specific gravity close to water are directly added into a facultative tank and an aeration tank to be used as active carriers of microorganisms, the microorganisms are in a fluidized state by means of mechanical stirring of the facultative tank, aeration in the aeration tank and lifting action of water flow, when the microorganisms are attached to the carriers, the floating carriers freely move in a reactor along with the convolution and turning action of mixed liquor, the inside and the outside of each carrier have different biological species, anaerobic bacteria or facultative bacteria grow in the carriers, aerobic bacteria are arranged outside the carriers, and each carrier is a micro reactor, so that nitrification reaction and denitrification reaction exist at the same time, and the sewage treatment effect is improved; the process can be used for a newly-built sewage treatment plant and can also be used for process modification and upgrading of the existing sewage treatment plant.

The MBBR method is introduced at the end of the 80 s and is quickly applied in Europe, and the MBBR method absorbs the advantages of the traditional activated sludge method and the biological contact oxidation method and becomes a novel high-efficiency composite process treatment method. In the research of the past decades, the MBBR method is widely applied to industrial wastewater such as paper-making wastewater, food industry wastewater, slaughter wastewater, oil refining wastewater and the like as a mature process, and can also treat urban domestic sewage and mixed sewage of the urban wastewater and the industrial wastewater, and a plurality of engineering examples show that the MBBR method has good effect on treating the sewage.

But the MBBR technology also has the problems of high energy consumption, small suspended particles of effluent and difficult treatment, because the filler has great influence on the traditional aeration system, the MBBR technology adopts a perforated pipe aeration mode mostly, the mode is impact-resistant and has long service life of the aeration system, and because the bubbles are large, the oxygen transmission rate is influenced, so that the energy consumption of the MBBR technology is about 20 percent higher than that of a specific activity sludge method; in addition, because the filler is in a flowing state and continuously collides with particles in the reactor, the particle size of the particles is reduced, and the downstream sludge sedimentation effect is poor.

Disclosure of Invention

Aiming at the problems and the defects of the original sewage treatment process and the MBBR process, the invention provides a sewage treatment device based on the suspended filler biofilm technology, which has the advantages of small occupied area, high volume load, good sewage treatment effect, impact load resistance and convenient operation and maintenance.

In order to solve the technical problems, the invention provides the following technical scheme:

a sewage treatment device based on suspended filler biomembrane technology comprises an aerobic reactor and a facultative reactor;

the aerobic reactor comprises an aerobic tank, an aerobic filler system is filled in the aerobic tank, and an aeration stirring device for aerating and stirring water quality in the aerobic tank is arranged in the aerobic tank; the aerobic tank is provided with a water inlet system for introducing sewage into the aerobic tank, a water outlet of the aerobic tank is arranged above the aerobic tank, and an aerobic tank outlet filler intercepting component communicated with the water outlet of the aerobic tank is arranged in the aerobic tank;

the facultative reactor comprises a facultative tank, a facultative filler system is filled in the facultative tank, and a stirring and flushing device for stirring sewage and filler in the facultative tank and flushing suspended matters accumulated on the surface of the filler and aged biological membranes is arranged on the facultative tank; the facultative tank is provided with a water inlet system for introducing sewage into the facultative tank, a facultative tank water outlet is arranged above the facultative tank, and a facultative tank outlet filler intercepting component communicated with the facultative tank water outlet is arranged in the facultative tank.

The following is a further optimization of the above technical solution of the present invention:

further optimization: the aerobic filler system comprises suspended fillers filled in the aerobic tank and aerobic microorganisms attached to the suspended fillers, and the filling amount of the suspended fillers is 60-90%.

Further optimization: the suspended filler is positioned in the aerobic tank and divided into an upper layer and a lower layer, the lower layer of suspended filler is positioned in the sewage and close to the lower position of the aerobic tank, and the upper layer of suspended filler is positioned in the sewage and close to the upper position of the aerobic tank.

Further optimization: the aeration stirring device comprises at least one set of aeration components arranged at the bottom of the aerobic tank.

Further optimization: the facultative filler system comprises suspended fillers filled in the facultative tank and facultative microorganisms attached to the suspended fillers, the filling amount of the suspended fillers is 60-90%, the suspended fillers are layered in the facultative tank and divided into an upper layer and a lower layer, the lower suspended fillers are located in sewage and close to the lower position of the facultative tank, and the upper suspended fillers are located in sewage and close to the upper position of the facultative tank.

The invention also provides a treatment process for treating sewage by using the sewage treatment device based on the suspended filler biofilm technology, which specifically comprises the following steps:

1) sending sewage into an aerobic tank, and keeping the pH value in the aerobic reactor to be 6-9, wherein the temperature is as follows: 5-37 ℃, DO (dissolved oxygen): 3-5 mg/L, and converting ammonia nitrogen in the sewage into nitrate nitrogen under the action of aerobic microorganisms in the aerobic tank;

2) the effluent of the aerobic tank (14) automatically flows into a facultative tank, the pH value in the facultative reactor is 6-9, the rotating speed of a stirrer in the facultative tank is controlled at 20-60 r/min, and the nitrate nitrogen in the sewage is further converted into nitrogen under the action of facultative microorganisms in the facultative tank;

3) and the effluent of the facultative tank enters the water outlet pipe through self-flowing, and finally reaches the discharge standard.

and (3) operating the aerobic reactor and the facultative reactor in the steps 1) and 2) for a period of time, then carrying out forward flushing, wherein the forward flushing period is 24-120h, each time is 30-60min, the forward flushing water is discharged into a sludge treatment unit for concentration and precipitation, the forward flushing water is precipitated to obtain supernatant, and then the supernatant is returned to a downstream reactor of the forward flushing reactor for further treatment.

Further optimization: when the aerobic reactor and the facultative reactor in the steps 1) and 2) are flushed in the forward direction, the aeration stirring device and the stirring flushing device respectively output power for completely mixing suspended fillers and sewage in the aerobic reactor and the facultative reactor which are used oppositely, and simultaneously, the suspended fillers on the upper layer and the suspended fillers on the lower layer are both in a fluidized state, so that suspended matters accumulated among the suspended fillers and biomembranes aged on the surfaces of the suspended fillers are flushed out of the reactor.

Further optimization: the water outlet end of the facultative tank is communicated with the water inlet end of the secondary facultative tank, and the water inlet end of the secondary facultative tank is communicated with the water inlet end of the secondary aerobic tank;

and (3) feeding the sewage into an aerobic tank, carrying out aerobic treatment on the sewage in the aerobic tank, then automatically flowing into a subsequent primary facultative tank, a secondary facultative tank and a secondary aerobic tank, and finally discharging the effluent which reaches the standard.

Further optimization: the water outlet end of the aerobic tank is directly communicated with the water inlet end of the secondary aerobic tank, and the water outlet end of the secondary aerobic tank is communicated with solid-liquid separation equipment;

and (2) feeding the sewage into an aerobic tank, carrying out aerobic treatment on the sewage in the aerobic tank, then automatically flowing into a secondary aerobic tank, further carrying out aerobic treatment on the sewage in the secondary aerobic tank, and feeding the effluent of the secondary aerobic tank into a solid-liquid separation device for further treatment.

Further optimization: the water inlet end of the aerobic tank is communicated with the water outlet end of the front denitrification tank, the water outlet end of the aerobic tank is communicated with the water inlet end of the nitrification tank, the water outlet end of the nitrification tank is communicated with the water inlet end of the rear denitrification tank, and the water outlet end of the rear denitrification tank is communicated with solid-liquid separation equipment;

feeding sewage into a preposed denitrification tank, performing denitrification treatment on the sewage in the preposed denitrification tank, then automatically flowing into an aerobic tank, performing aerobic treatment on the sewage in the aerobic tank, then automatically flowing into a nitrification tank, performing nitrification treatment on the sewage in the nitrification tank, then automatically flowing into a postposition denitrification tank, and further performing denitrification treatment on the sewage in the postposition denitrification tank;

the effluent of the post-positioned denitrification tank enters a solid-liquid separation device for further treatment, and the effluent is discharged or recycled after reaching the standard.

By adopting the technical scheme, compared with the traditional sewage treatment device, the reactor has no sludge expansion phenomenon, sludge does not need to flow back, a secondary sedimentation tank system does not exist in the rear-end effluent, and the reactor has the advantages of small floor area, high volume load, good treatment effect, impact load resistance, convenience in operation and maintenance and the like.

And the filling material with the specific gravity close to water is put into the aerobic tank and the facultative tank to become an active carrier of the microorganism, and most of the filling material in the reactor can not freely move when in normal operation due to the large filling amount (60-90 percent filling rate) of the filling material; microorganisms in the biological film are attached to and grow on the surface of the filler, and pollutants are taken as growing food; the sewage continuously enters the bioreactor, and the sewage is used for intermittently cleaning and removing excessive microorganisms (sludge) and trapped suspended matters on the biofilm filler. The packing provides a large pore volume (porosity is typically 85%) for growth and accumulation of microorganisms, maximizing the run time between cleaning cycles, while high carbon and nutrient concentration gradients occur in the biofilm, and during aeration in the reactor, the bubbles must pass through the packing with very high packing rates, resulting in longer residence time and longer paths to the reactor surface, and improved oxygen transfer efficiency, and the high density packing can also act as a "filter" to reduce the concentration of solid matter in the reactor effluent during normal operation.

The invention is further described with reference to the following figures and examples.

Drawings

FIG. 1 is a schematic structural view of an aerobic reactor in example 1 of the present invention;

FIG. 2 is a schematic structural view of a facultative reactor in example 1 of the present invention;

FIG. 3 is a view showing the construction of sewage treatment using the sewage treatment apparatus in example 1 of the present invention;

FIG. 4 is a structural view of the effluent treatment of the secondary sedimentation tank using the sewage treatment apparatus in example 2 of the present invention;

FIG. 5 is a structural view of river water treatment using the sewage treatment apparatus in example 3 of the present invention;

FIG. 6 is a schematic view showing the construction of a domestic sewage treatment apparatus according to example 4 of the present invention.

In the figure: 1-an aerobic reactor; 2-facultative reactor; 3-intercepting a screen mesh at an outlet of the aerobic tank; 4-a water distribution pipe at the water inlet bottom of the aerobic tank; 5-an aeration pipe at the bottom of the aerobic tank; 6-facultative tank; 7-a facultative tank effluent interception screen; 8-positively flushing the aeration pipe; 9-a stirrer; 10-a water distribution pipe at the bottom of the facultative tank; 11-an outlet pipe of the aerobic tank; 12-an aerobic pool fan; 13-a water inlet of the aerobic tank; 14-an aerobic tank; 15-facultative tank fan; 16-facultative tank water inlet.

Detailed Description

Example 1: as shown in fig. 1 to 3, the sewage treatment apparatus based on the suspended filler biofilm technology comprises an aerobic reactor 1 and a facultative reactor 2, wherein the aerobic reactor 1 and the facultative reactor 2 can be freely combined for treating sewage according to the characteristics of the sewage to be treated.

The aerobic reactor 1 comprises an aerobic tank 14, an aerobic filler system is filled in the aerobic tank 14, and an aeration stirring device for aerating and stirring water in the aerobic tank 14 is arranged in the aerobic tank 14.

The facultative reactor 2 comprises a facultative tank 6, a facultative filler system is filled in the facultative tank 6, and a stirring and flushing device for stirring sewage and filler in the facultative tank 6 and flushing suspended matters accumulated on the surface of the filler and aged biological membranes is arranged on the facultative tank 6.

Be provided with water intake system on the good oxygen pond 14 and be used for letting in sewage for good oxygen pond 14 in, water intake system is including setting up good oxygen pond water inlet 13 on good oxygen pond 14, the one end that good oxygen pond water inlet 13 is located good oxygen pond 14 has good oxygen pond bottom water distribution pipe 4 of intaking through the pipe connection, good oxygen pond bottom water distribution pipe 4 of intaking is laid in the bottom of good oxygen pond 14 and is used for realizing the bottom and intake.

A plurality of water outlets are uniformly formed in the water inlet bottom water distribution pipe 4 of the aerobic tank at annular intervals and used for uniformly distributing water to control the flow velocity of water and prevent high impact load caused by overhigh flow velocity of sewage from influencing the content of aerobic microorganisms.

The water inlet 13 of the aerobic tank is communicated with a lift pump, and the sewage to be treated is lifted into the water inlet 13 of the aerobic tank.

Design like this, can introduce good oxygen pond bottom water distributor 4 of intaking with sewage through elevator pump and good oxygen pond water inlet 13 in to apopore of seting up on the bottom water distributor 4 of intaking through good oxygen pond is used for controlling the velocity of water flow to the even water distribution of intaking, prevents to influence good oxygen microorganism's content because of the high impact load that sewage velocity of flow is too high brings, thereby guarantees good oxygen microorganism to the decomposition of organic matter in the sewage and reduces the COD content in the sewage.

And a valve is arranged on the water inlet 13 of the aerobic tank in series and is used for adjusting the inflow rate of sewage.

The aerobic filling system comprises suspended fillers filled in the aerobic tank 14 and aerobic microorganisms such as bacteria, fungi, protozoa and metazoans attached to the suspended fillers, the filling amount of the suspended fillers is 60-90%, and the biomass concentration in the aerobic tank 14 is 2-20 g/L.

The large amount of suspended fillers are layered in the aerobic tank 14 and divided into an upper layer and a lower layer, the lower layer of suspended fillers account for 20-40% of the total suspended fillers, and the upper layer of suspended fillers account for 60-80% of the total suspended fillers.

The lower-layer suspended filler is positioned in the sewage and close to the lower part of the aerobic tank 14, the lower-layer suspended filler has larger movement distance and is actively moved by the stirring force of the aeration stirring device, so that aerobic microorganisms attached to the suspended filler can be fully mixed with the sewage, and the sewage treatment effect is improved.

The upper layer of suspended filler is positioned above the aerobic tank 14 in the sewage, the movement distance of the upper layer of suspended filler is smaller due to the extrusion of the adjacent suspended fillers, and the upper layer of suspended filler is positioned in the aerobic tank 14 to form a biological filler filter bed for intercepting aerobic microorganisms and suspended matters.

By the design, the density content of the aerobic microorganisms attached to the filler in the aerobic tank 14 is higher, and meanwhile, the lower-layer suspended filler actively moves to enable the aerobic microorganisms attached to the suspended filler to be fully mixed with sewage, so that the sewage treatment effect is improved.

And the movement distance of the upper layer of the suspended filler is smaller, so that the upper layer of the suspended filler is positioned in the aerobic tank 14 to form a biological filler filter bed, and the biological filler filter bed is used for performing good intercepting and filtering effects on suspended matters and aerobic microorganisms in the aerobic tank 14.

And the biological filler filter bed is formed by the upper layer of suspended filler, so that when sewage flows upwards from the lower part of the aerobic tank and under the action of the aeration stirring device, the sewage forms plug flow through the upper layer of suspended filler, the reaction rate is improved, the suspended concentration of the effluent is ensured to be very low, and the treatment effect is further improved.

The aeration stirring device comprises at least one set of aeration components arranged at the bottom of the aerobic tank 14, the aeration components comprise an aeration pipe 5 at the bottom of the aerobic tank, and the air inlet end of the aeration pipe 5 at the bottom of the aerobic tank is communicated with an aerobic tank fan 12 arranged outside the aerobic tank 14 through a pipeline.

A plurality of air outlet holes are uniformly formed in the aeration pipe 5 at the bottom of the aerobic tank in an annular shape, and air output by the fan 12 is conveyed into the aeration pipe 5 at the bottom of the aerobic tank through a pipeline and then discharged through the air outlet holes to realize aeration on the bottom of the aerobic tank 14.

And aerate through aerobic tank bottom aeration pipe 5 and the trompil of seting up on aerobic tank bottom aeration pipe 5, can reduce the aeration resistance loss, solved traditional aeration pipeline's jam problem, change traditional aeration mode into linear aeration simultaneously for the aeration is more even, and the vertical circulation of formation makes the stirring mix more even, promotes oxygen utilization ratio and power efficiency.

The aerobic tank fan 12 and the aeration pipe 5 at the bottom of the aerobic tank output airflow to aerate the aerobic tank 14, the lower-layer suspended filler and the sewage are stirred by the aeration energy to enable the suspended filler to actively move and fully contact with the sewage, and then aerobic microorganisms attached to the suspended filler can be fully mixed with the sewage.

After the aerobic reactor 1 operates for a period of time, the stirring force for the suspended fillers and the sewage is increased, so that the suspended fillers on the upper layer and the suspended fillers on the lower layer actively move to be in a fluidized state, forward flushing is carried out, the suspended fillers collide with each other under the action of the stirring force and fully contact with the sewage, suspended matters accumulated on the surfaces of the suspended fillers and aged biological membranes drop along with flushing, and the biological membranes are alternately updated.

The increase of the stirring force for the suspended filler and the sewage can be realized by increasing the aeration rate of the aerobic tank 14 by the aerobic tank fan 12 and the aeration pipe 5 at the bottom of the aerobic tank, the working power of the aerobic tank fan 12 is increased to improve the pressure of the output airflow, so that the aeration rate of the aerobic tank 14 is improved, the sewage and the suspended filler are stirred by the aeration energy after the aeration rate of the aerobic tank is improved, and then the suspended filler is in a fluidized state to be washed in the forward direction.

The increase also can establish one set of aeration subassembly through adding again and realize suspending the stirring power of filler and sewage, when needs are carried out forward and are washed, many sets of aeration subassemblies are opened simultaneously and are carried out the aeration to good oxygen pond 14 and realize improving the aeration rate, and then can realize increaseing the stirring power to suspending filler and sewage, when carrying out normal sewage treatment, close the aeration subassembly that is used for increaseing the aeration rate, only leave one set of aeration subassembly and aerate, realize the layering to suspending filler.

The increase also can be realized through establishing the agitator with adding to suspension filler and sewage, opens the agitator when needs carry out forward washing, and agitator work is used for stirring the sewage and the suspension filler in the good oxygen pond 14, makes the suspension filler be the fluidization state by the stirring of agitator, carries out forward washing, when carrying out normal sewage treatment, closes the agitator or reduces the operating speed of agitator, makes the stirring power of suspension filler and sewage reduce, and then makes the suspension filler carry out the layering.

The normal water feeding is still carried out during the forward flushing of the reactor, and the fed water can be effectively treated.

The concentration of suspended matters in the forward flushing water is high, the particle size of the suspended matters in the flushing water is large, the sedimentation performance is good (the SVI value is generally lower than 80 mg/L), the flushing water can be directly discharged into a sludge treatment unit, such as a sludge concentration tank, the supernatant is obtained after concentration and sedimentation, and then the supernatant is further treated.

The bubbles generated during aeration of the aeration pipe 5 at the bottom of the aerobic tank must pass through the suspended filler with extremely high filling rate, so that the retention time and the path reaching the surface of the aerobic tank 14 are prolonged, and the shearing action of the suspended filler on the bubbles greatly improves the transmission rate of oxygen, thereby improving the oxygen transmission efficiency and reducing the energy consumption of wastewater treatment.

And the pipeline for communicating the aeration pipe 5 at the bottom of the aerobic tank with the fan 12 of the aerobic tank is provided with an adjusting valve in series for adjusting the gas supply amount.

The aeration pipe 5 at the bottom of the aerobic tank is made of stainless steel, so that the service life of the whole aeration pipe is long, and the aeration pipe does not need to be replaced periodically.

An aerobic tank water outlet is arranged at a position close to the upper part of the aerobic tank 14, and an aerobic tank outlet filler intercepting component communicated with the aerobic tank water outlet is arranged in the aerobic tank 14

The good oxygen pond export interception assembly of packing includes good oxygen pond export interception screen cloth 3, be the annular on the good oxygen pond export interception screen cloth 3 and evenly seted up a plurality of trompils, the diameter of this trompil is less than the excircle diameter of suspended packing.

An aerobic tank water outlet pipe 11 is arranged at the outer end of the aerobic tank 14 positioned at the water outlet of the aerobic tank, and the aerobic tank water outlet pipe 11 is used for outputting sewage treated in the aerobic tank 14.

Design like this, can be used for the suspended filler in the good oxygen pond 14 of effectual interception through good oxygen pond export interception screen cloth 3, prevent that suspended filler from running off and entering into next grade, and then guarantee aerobic microorganism's attached environment and aerobic microorganism's in the good oxygen pond 14 density to guarantee the treatment effect to organic matter and COD content in the sewage.

Be provided with water intake system on facultative tank 6 and be used for letting in sewage for facultative tank 6, water intake system includes facultative tank water inlet 16, facultative tank water inlet 16 is located the one end in good oxygen pond 14 and has facultative tank bottom water distributor 10 through the pipe connection, facultative tank bottom water distributor 10 is laid and is used for realizing bottom intaking in the bottom of facultative tank 6.

The facultative tank bottom water distribution pipe 10 is provided with paired openings uniformly in an annular shape, and is used for uniformly distributing water to control the flow velocity of water flow and prevent high impact load caused by overhigh flow velocity of sewage from influencing the sewage treatment process.

The facultative tank water inlet 16 is provided with a valve in series, and the valve is used for adjusting the inflow of sewage.

The facultative anaerobic filler system comprises suspended fillers filled in the facultative tank 6 and facultative microorganisms consisting of denitrifying bacteria, nitrifying bacteria, yeasts, protozoans and metazoans attached to the suspended fillers, wherein the filling amount of the suspended fillers is 60-90%.

The large amount of suspended fillers are layered in the facultative tank 6 and divided into an upper layer and a lower layer, the lower layer of suspended fillers accounts for 20-40% of the total suspended fillers, and the upper layer of suspended fillers accounts for 60-80% of the total suspended fillers.

The lower floor's suspension is packed and is located 6 below positions of being close to facultative tank in the sewage, the motion interval of lower floor's suspension is great and receive stirring washing unit's stirring power to make the motion of lower floor's suspension pack active and then make attached to the facultative anaerobe on the suspension packs can with sewage intensive mixing, improve sewage treatment effect.

The upper layer of suspended filler is positioned above the facultative tank 6 in the sewage, the upper layer of suspended filler is extruded by each adjacent suspended filler to enable the movement distance of the suspended filler to be smaller, and then the upper layer of suspended filler is positioned in the facultative tank 6 to form a biological filler filter bed for intercepting aerobic microorganisms and suspended matters in the sewage.

Design like this for attached to the facultative anaerobe's on the filler density content is higher in the facultative tank 6, and simultaneously, the motion of lower floor's suspended filler is lively to make attached to the facultative anaerobe on the suspended filler can with sewage intensive mixing, and then improves sewage treatment effect.

And the upper suspension filler has smaller movement distance, so that the upper suspension filler is positioned in the facultative tank 6 to form a biological filler filter bed, and the biological filler filter bed is used for well intercepting, intercepting and filtering suspended matters and facultative microorganisms in the facultative tank 6.

And form the biofilm carrier filter bed through this upper suspension filler, make sewage by the facultative tank 6 below intake and receive stirring washing unit's effect under, when making sewage upflow, sewage forms the plug flow through upper suspension filler, improves reaction rate, ensures that the aquatic suspended concentration is very low, and then improves treatment effect.

The stirring flushing device comprises a stirrer 9 driven by a power driving device, and stirring blades at the lower end of the stirrer 9 are placed in the facultative tank 6 and used for stirring sewage and suspended fillers in the facultative tank 6, so that denitrifying bacteria attached to the suspended fillers are fully contacted with the sewage.

The stirrer 9 is in the prior art and comprises a power driving device and stirring blades, wherein the power driving device outputs power to drive the stirring blades to rotate, the contour lines of the stirring blades are soft, and the fillers are not damaged.

By the design, the sewage in the facultative tank 6 can be stirred by the stirrer 9, so that denitrifying bacteria attached to the filler are fully contacted with the sewage, and then the denitrifying bacteria convert NO3-N in the sewage into N2 to be discharged into the air, thereby achieving the purpose of reducing TN (total nitrogen content) in the water.

The facultative tank 6 bottom is installed forward and is washed aeration pipe 8, the aeration pipe 8 air inlet end is washed forward and is passed through pipeline and the facultative tank fan 15 intercommunication of setting in the facultative tank 6 outside.

A plurality of air outlets are uniformly arranged on the forward flushing aeration pipe 8 in an annular shape.

Design like this, accessible facultative tank fan 15 output air transports to forward through the pipeline and washes in the aeration pipe 8, and then realizes the aeration to the low portion of facultative tank 6, makes and forms the facultative environment in the facultative tank 6, and then improves the treatment effect of sewage in facultative tank 6.

The facultative tank fan 15 and the forward flushing aeration pipe 8 output airflow to aerate the facultative tank 6, the suspended filler and the sewage in the facultative tank 6 are stirred by the aerated energy, and then the facultative anaerobe attached to the suspended filler can be fully mixed with the sewage.

When the filler needs to be positively washed, the operating power of the stirrer 9 and the facultative fan 15 is increased, and a large amount of suspended matters and aged biological membranes accumulated on the suspended filler after the facultative tank 6 operates for a period of time are positively washed.

All suspended fillers in the facultative tank 6 are stirred by the stirrer 9 to be in a fluidized state, suspended matters accumulated on the surfaces of the suspended fillers and aged biological films fall off along with the flushing and discharging system under the mutual collision action of water flow and the suspended fillers, meanwhile, the biological films are updated, water still normally enters the reactor during forward flushing, and meanwhile, the quality of discharged water is not influenced.

A facultative tank water outlet is arranged at a position close to the upper part in the facultative tank 6, and a facultative tank outlet filler intercepting component communicated with the facultative tank 6 water outlet is arranged in the facultative tank 6.

The facultative tank outlet filler intercepting component comprises a facultative tank outlet intercepting screen 7, and the water outlet end of the facultative tank outlet intercepting screen 7 is communicated with the facultative tank outlet.

A plurality of openings are uniformly formed in the facultative tank effluent intercepting screen 7 in an annular shape, and the diameter of each opening is smaller than the diameter of the outer circle of the suspended filler.

By the design, the suspended filler in the facultative tank 6 can be intercepted by the facultative tank effluent intercepting screen 7, the suspended filler in the facultative tank 6 is prevented from running off along with water, and the treatment effect of denitrifying bacteria on the ammonia nitrogen compounds in water is reduced.

The outer end of the water outlet of the facultative tank 6 is communicated with a water outlet pipe, and the water treated in the facultative tank 6 is discharged through the water outlet and the water outlet pipe.

As shown in fig. 3, the present invention also provides a treatment process for treating sewage by using the sewage treatment device based on the suspended filler biofilm technology, which comprises the following steps:

1) sending the sewage into the aerobic tank 14 through a lift pump or gravity flow, wherein the filling rate of the filler in the aerobic tank 14 is 60-90%, and the pH value in the aerobic reactor is kept to be 6-9, and the temperature is as follows: 10-37 ℃, DO (dissolved oxygen): 2-6 mg/L, the retention time is 60-90 min, ammonia nitrogen in the sewage is converted into nitrate nitrogen under the action of aerobic microorganisms in the aerobic tank 14, and COD in the water is reduced.

2) And the effluent of the aerobic tank 14 automatically flows into the facultative tank 6, the filling rate of the filler in the facultative tank 6 is 60-90%, the rotating speed of the stirrer 9 in the tank is controlled at 20-60 r/min, the retention time is 30-60min, the forward flushing period is 24h, 30min each time, and the nitrate nitrogen in the sewage is further converted into nitrogen under the action of the facultative microorganisms in the facultative tank 6, so that the aim of reducing TN is fulfilled.

3) And the effluent of the anoxic tank (6) enters the water outlet pipe through self-flowing, and finally reaches the discharge standard.

The water outlet ends of the aerobic tank 14 and the anoxic tank (6) are respectively communicated with the sludge treatment unit, the water outlet end of the sludge treatment unit is communicated with the water inlet end of the aerobic tank 14, the aerobic reactor (1) and the facultative reactor (2) are flushed in a forward direction after running for a period of time, the forward flushing period is 24 hours, 30 minutes are spent each time, the forward flushing water can be directly discharged into the sludge treatment unit for concentration and precipitation, supernatant is obtained after the forward flushing water is precipitated, and the supernatant enters the aerobic tank 14 through the water outlet end of the sludge treatment unit for further treatment.

To better explain that the aerobic reactor 1 and the facultative reactor 2 can be freely combined for treating sewage according to the characteristics of the sewage to be treated, refer to examples 2-4 below.

Example 2:

the COD, ammonia nitrogen and total nitrogen data of the effluent of the secondary sedimentation tank after sewage treatment in a certain sewage treatment plant are detected, and the indexes of the effluent of the secondary sedimentation tank are as follows: COD: 52mg/L, NH 4-N: 8.5mg/L, TN: 21.6 mg/L, and the effluent index seriously exceeds the standard.

As shown in figure 4, the effluent of the secondary sedimentation tank is deeply treated by adopting an aerobic-facultative-aerobic four-stage treatment technology, wherein the aerobic-facultative-aerobic four-stage treatment technology is a primary aerobic tank, a primary facultative tank, a secondary facultative tank and a secondary aerobic tank.

The primary aerobic tank and the secondary aerobic tank both adopt aerobic reactors 1 in embodiment 1, and the primary facultative tank and the secondary facultative tank both adopt facultative reactors 2 in embodiment 1.

The embodiment adopts the technical scheme to carry out advanced treatment on the effluent of the secondary sedimentation tank of a certain sewage treatment plant, and the specific operation steps are as follows:

the effluent amount of a secondary sedimentation tank of a certain sewage treatment plant is as follows: 500m3/h, COD 52mg/L, NH 4-N: 8.5mg/L, TN: 21.6 mg/L.

The effluent of the secondary sedimentation tank is sent into a primary aerobic tank through a lift pump or gravity flow, the filling rate of a filler in the primary aerobic tank is 60-90%, DO (dissolved oxygen) is 3-5 mg/L, the hydraulic retention time of the effluent of the secondary sedimentation tank in the primary aerobic tank is 30min, then the effluent enters a subsequent primary facultative tank, a secondary facultative tank and a secondary aerobic tank, the hydraulic retention time in each tank is 10min, 40min and 10min respectively, the final effluent amount is 500m3/h, and the detected index of the effluent is as follows: COD is 42mg/L, NH 4-N: 1.45mg/L, TN: 10.7mg/L, therefore, the quality of the effluent reaches the first class A emission standard.

Therefore, in the embodiment, the aerobic reactor 1 and the facultative reactor 2 are combined into four-stage treatment of aerobic-facultative-anaerobic-aerobic, so that the effluent of the secondary sedimentation tank of the sewage treatment plant is deeply treated, the effluent index can be greatly reduced, the sewage is deeply purified, and the treated sewage reaches the first-level A discharge standard.

Example 3:

the indexes of the river water are detected, and the indexes of the river water are detected as follows: COD is 25mg/L, NH₄-N: 5.5mg/L, TP: 5.7 mg/L, and the ammonia nitrogen and the total phosphorus of the riverway water seriously exceed the standard.

As shown in fig. 5, the present embodiment uses the "aerobic-solid-liquid separation" treatment technology to treat the river water, and the aerobic-solid-liquid separation "treatment is a primary aerobic tank-a secondary aerobic tank-a solid-liquid separation device.

The primary aerobic tank and the secondary aerobic tank both adopt the aerobic reactor 1 in the embodiment 1, the solid-liquid separation equipment is one or a combination of a floatation machine, a sedimentation tank and a filtering device, and the floatation machine, the sedimentation tank and the filtering device are all in the prior art.

In this embodiment, the solid-liquid separation apparatus is an air flotation machine.

The embodiment adopts the technical scheme to carry out advanced treatment on river water, and the specific operation steps are as follows:

the river water flow is 120m³The specific indexes of the river water are as follows: COD is 25mg/L, NH₄-N：5.5mg/L，TP：5.7mg/L。

The river water is firstly sent into a first-stage aerobic tank through a lift pump or gravity flow, the filling rate of fillers in the first-stage aerobic tank is 60-90%, and DO (dissolved oxygen) is 3 ~ 5mg/L, after the river water enters the first-stage aerobic tank, the hydraulic retention time is 30min, then the river water automatically flows into a second-stage aerobic tank, the filling rate of fillers in the second-stage aerobic tank is 60-90%, and DO (dissolved oxygen) is 3 ~ 5mg/L, after the river water enters the second-stage aerobic tank, the hydraulic retention time is 30min, the water discharged from the second-stage aerobic tank enters an air floatation machine for adding drugs and removing phosphorus, and the final water discharge amount is 120m³And the detected water outlet indexes are as follows: COD is 13mg/L, NH₄-N: 0.15mg/L, TP: 0.1mg/L, thereby the water quality of the discharged water reaches the GB3838 surface water IV class water discharge standard.

Therefore, in the embodiment, the aerobic reactor 1 and the air floatation machine in the prior art are combined into the 'aerobic-solid-liquid separation' treatment technology to carry out advanced treatment on the river water, so that the indexes of the river water can be greatly reduced, the river water is deeply purified, and the treated river water reaches the GB3838 surface water IV type water discharge standard.

Example 4:

the indexes of the domestic sewage of a certain village and a certain town are detected as follows: COD is 500mg/L, NH₄-N: 60mg/L, TN: 65 mg/L, TP: 10mg/L, the domestic sewage of the villages and towns seriously exceeds the standard.

As shown in fig. 6, the present embodiment uses a four-stage treatment technology of pre-denitrification-aerobic-nitrification-post-denitrification to treat domestic sewage, and the four-stage treatment technology of pre-denitrification-aerobic-nitrification-post-denitrification comprises: the device comprises a front denitrification tank, an aerobic tank, a nitrification tank and a rear denitrification tank, wherein forward flushing water of the front denitrification tank enters a sludge concentration tank, supernatant obtained after sedimentation treatment in the sludge concentration tank enters the aerobic tank, and a water outlet of the rear denitrification tank is communicated with solid-liquid separation equipment.

The pre-denitrification tank adopts the facultative reactor 2 in the embodiment 1, and a filling system in the facultative reactor 2 is a suspended filler and denitrifying bacteria attached to the suspended filler.

The aerobic tank adopts the aerobic reactor 1 in the embodiment 1.

The nitrification tank adopts the facultative reactor 2 in the embodiment 1, and a filling system in the facultative reactor 2 is a suspended filler and nitrifying bacteria attached to the suspended filler.

The postposition denitrification tank adopts the facultative reactor 2 in the embodiment 1, and a filling system in the facultative reactor 2 is a suspended filler and denitrifying bacteria attached to the suspended filler.

The sludge concentration tank is the prior art.

The solid-liquid separation equipment is one or a combination of a floatation device, a sedimentation tank and a filtering device, and the floatation device, the sedimentation tank and the filtering device are all in the prior art.

In this embodiment, the solid-liquid separation apparatus is an air flotation apparatus.

The embodiment adopts the technical scheme to carry out advanced treatment on domestic sewage of a certain village and town, and the specific operation steps are as follows:

the inlet water quality and quantity condition of the treatment device is as follows: the water quantity is 80m³D, COD 500mg/L, NH₄-N：60mg/L，TN：65mg/L，TP：10mg/L。

The village and town domestic sewage is firstly fed into a preposed denitrification tank through a lift pump or gravity flow, the filling rate of a filler in the preposed denitrification tank is 60 ~ 90%, the sewage enters the preposed denitrification tank, the hydraulic retention time is 5h, then the sewage automatically flows into an aerobic tank, the filling rate of the filler in the aerobic tank is 60-90%, DO (dissolved oxygen) is 3 ~ 5mg/L, the hydraulic retention time is 4h after the sewage enters the aerobic tank, the effluent of the aerobic tank then enters a nitrification tank, the filling rate of the filler in the nitrification tank is 60-90%, DO (dissolved oxygen) is 3 ~ 5mg/L, the hydraulic retention time is 4h after the sewage enters the nitrification tank, the effluent of the nitrification tank finally automatically flows into a postpositional denitrification tank, the filling rate of the filler in the postpositional denitrification tank is 60-90%, and the hydraulic retention time is 1h after the sewage enters the postpositional denitrification tank;

and the water discharged from the rear denitrification tank enters an air floatation device through a lift pump to add and remove the phosphorus, and the discharged water reaches the standard and is discharged or recycled.

Part of effluent of the nitrification tank returns to the preposed denitrification tank through a pump for denitrification reaction.

Forward flushing water of the preposed denitrification tank flows into the sludge concentration tank through gravity, the sludge concentration tank concentrates and precipitates the flushing water to obtain supernatant, and the supernatant in the sludge concentration tank flows back to the aerobic tank for further treatment.

The scum of the air floatation equipment also enters the same sludge concentration tank.

The final water yield after the treatment by the technology is 80m³D, and the indexes of the effluent are detected to be that COD is less than or equal to 50mg/L and NH₄N is less than or equal to 5mg/L, TN is less than or equal to 15mg/L, and TP is less than or equal to 0.5mg/L, so that the water quality of the effluent reaches the first-grade A discharge standard GB 18918.

Therefore, in the embodiment, the aerobic reactor 1, the facultative reactor 2, the air floatation equipment in the prior art and the sludge concentration tank are combined into a treatment technology of pre-denitrification-aerobic-nitrification-post-denitrification to carry out advanced treatment on the domestic sewage, so that the indexes of the domestic sewage can be greatly reduced, the domestic sewage is deeply purified, and the treated domestic sewage reaches the GB18918 first-class A discharge standard.

When the treatment process is adopted to treat the wastewater, the invention has the following beneficial effects:

(1) the biomass concentration is high, the whole structure is compact, and the occupied area is small:

the concentration of biomass in the reactor is higher, generally 3-5 times of the concentration of sludge in a common activated sludge process, and the concentration of biomass in an aerobic tank can be as high as 2-20 g/L; the specific surface area of the filler biofilm is large, the volume load of the reactor is high, the occupied area of the process is reduced by 75 percent compared with that of the traditional activated sludge method under the same load condition, the occupied area of the process is reduced by 25 percent compared with that of the traditional MBBR process, a secondary sedimentation tank is omitted, and the traditional three steps of primary sedimentation, biochemical sedimentation and secondary sedimentation are integrated; the upgrading and transformation effect of the existing sewage treatment plant is remarkable, the area without increasing the land is only needed to be simply transformed into the existing facilities, the sewage treatment capacity can be increased by 2-3 times, and the effluent quality is improved.

(2) The biomass activity is high:

the process does not require sludge recirculation, and the biomass in each tank is generated specifically for the function for which the reaction tank is designed. For example, most of the biomass in the biofilm of the aerobic tank is aerobic microorganisms, wherein the activity of the aerobic microorganism group is greatly influenced by the concentration of suspended sludge and the concentration of COD, and in the improved MBBR process, designers need to plan the whole system comprehensively to ensure that the concentration of suspended matters and COD entering the nitrification tank reach a lower level so as to maintain the high activity of the biomass.

(3) Impact resistance is strong, the performance is stable, and the operation is reliable:

impact load and temperature change have far less influence on the process than the activated sludge process, sludge bulking does not need to be concerned, and the biological membrane has strong tolerance to the sewage when the sewage components change or the sewage toxicity increases.

The process water flow is plug flow in a normal treatment mode, and is completely mixed in a forward flushing mode, the plug flow can improve the matrix transmission rate and ensure the very low effluent concentration, and bubbles have to go many curved paths in the reactor due to the extremely high filling rate of the filler, so that the oxygen transmission rate can be greatly improved in the process, and the test result shows that the oxygen transmission rate of the process is doubled compared with that of an MBBR process.

The extremely high filler filling rate can have interception and filtration effects on suspended matters, and the suspended matters of the effluent of the process are 60-80% lower than that of the effluent of the MBBR process in a normal mode.

The washing water generated in the forward washing mode has high suspended matter concentration and good sedimentation performance, and can directly enter a sludge concentration tank for treatment.

(4) The stirring and aeration system is convenient to operate and simple to maintain:

the aeration system adopts a perforated aeration pipe system, so that the blockage is not easy to happen; the aeration system is made of stainless steel, so that the service life is long, and the aeration system does not need to be replaced periodically; the stirring blades adopted by the stirrer are soft in outline and line, and the filler is not damaged; the aeration tank is not required to be provided with a filler support, and the whole stirring and aeration system is easy to maintain and manage.

(5) No blockage, small water loss, full utilization of the tank capacity:

the carrier organisms continuously fall off in the turbulent flow, so that blockage is avoided, no matter in a normal treatment mode or a forward flushing mode, the filler and water flow can be mixed in the whole volume of the biological pond, and the pond volume is completely utilized.

(6) The process is flexible and convenient to configure and wide in application range:

the flexibility of the process is embodied in two aspects: on one hand, various pool types (depth square and circle) can be adopted without influencing the treatment effect of the process; on the other hand, the number of stages and the function of each stage can be flexibly selected, the stable standard reaching of different water inlet and outlet quality requirements can be ensured, and the application range is wide. The process can conveniently increase the filler for the transformation and the upgrade of the original activated sludge treatment plant.

(7) The service life is long:

the high-quality durable biological suspended filler, the aeration system and the water outlet device can ensure that the whole system can be used for a long time without replacement, and the depreciation rate is low.

(8) Does not need sludge backflow, and has good sludge settling performance:

the concentration of suspended matters in the forward flushing water is high, and the particle size of the suspended matters in the flushing water is large and the sedimentation performance is good (the SVI value is generally lower than 80 mg/L) because the mutual collision strength of the fillers in the improved MBBR reactor is small in a normal mode. This means that the flushing water can be fed to a sludge treatment unit, such as a gravity thickening tank, for thickening and even to a sludge dewatering unit for treatment.

(9) The investment is saved, the energy consumption is low:

the test result shows that the removal rate of ammonia nitrogen of the biofilm with the unit area under the process can be improved by about 30 percent compared with the traditional MBBR process, which means that the process has less requirement on the filler compared with the traditional MBBR process, and has small occupied area and less capital investment. Compared with the traditional activated sludge method, the investment of the improved MBBR process is reduced by 41 percent, and compared with the traditional MBBR process, the investment of the improved MBBR process is reduced by 26 percent. The high oxygen transfer rate of the process reduces the energy consumption in the process by 30%.

(10) The operation is simple, the process can be automated, and the operation and the control are easy.

It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.

Claims

1. Sewage treatment plant based on suspension filler biomembrane technique, its characterized in that: comprises an aerobic reactor (1) and a facultative reactor (2);

the aerobic reactor (1) comprises an aerobic tank (14), an aerobic filler system is filled in the aerobic tank (14), and an aeration stirring device for aerating and stirring water in the aerobic tank (14) is arranged in the aerobic tank (14); a water inlet system for introducing sewage into the aerobic tank (14) is arranged on the aerobic tank (14), an aerobic tank water outlet is arranged above the aerobic tank (14), and an aerobic tank outlet filler intercepting component communicated with the aerobic tank water outlet is arranged in the aerobic tank (14);

the facultative reactor (2) comprises a facultative tank (6), a facultative filler system is filled in the facultative tank (6), and a stirring and flushing device for stirring sewage and fillers in the facultative tank (6) and flushing suspended matters accumulated on the surface of the fillers and aged biological membranes is arranged on the facultative tank (6); the facultative tank (6) is provided with a water inlet system for introducing sewage into the facultative tank (6), a facultative tank water outlet is arranged above the facultative tank (6), and a facultative tank outlet filler intercepting component communicated with the facultative tank water outlet is arranged in the facultative tank (6).

2. The sewage treatment device based on the suspended filler biofilm technology of claim 1, wherein: the aerobic filling system comprises suspended fillers filled in the aerobic pool (14) and aerobic microorganisms attached to the suspended fillers, and the filling amount of the suspended fillers is 60-90%.

3. The sewage treatment device based on the suspended filler biofilm technology of claim 2, wherein: the suspended filler is positioned in the aerobic tank (14) and divided into an upper layer and a lower layer, the lower layer of suspended filler is positioned in the sewage and close to the lower position of the aerobic tank (14), and the upper layer of suspended filler is positioned in the sewage and close to the upper position of the aerobic tank (14).

4. The sewage treatment device based on the suspended filler biofilm technology of claim 3, wherein: the aeration stirring device comprises at least one set of aeration components arranged at the bottom of the aerobic tank (14).

5. The sewage treatment device based on the suspended filler biofilm technology of claim 4, wherein: the facultative filler system comprises suspended fillers filled in the facultative tank (6) and facultative microorganisms attached to the suspended fillers, the filling amount of the suspended fillers is 60-90%, the suspended fillers are layered in the facultative tank (6) and divided into an upper layer and a lower layer, the lower suspended fillers are located in sewage and close to the lower position of the facultative tank (6), and the upper suspended fillers are located in sewage and close to the upper position of the facultative tank (6).

6. The treatment process of the sewage treatment device based on the suspended filler biofilm technology according to the claim 1 to 5, characterized in that: the process specifically comprises the following steps:

1) sending the sewage into an aerobic tank (14), keeping the pH value in the aerobic reactor (1) at 6-9, and keeping the temperature: 5-37 ℃, DO (dissolved oxygen): 2-6 mg/L, and converting ammonia nitrogen in the sewage into nitrate nitrogen under the action of aerobic microorganisms in an aerobic tank (14);

2) the effluent of the aerobic tank (14) automatically flows into the facultative tank (6), the pH value in the facultative reactor (2) is 6-9, the rotating speed of a stirrer in the facultative tank (6) is controlled at 20-60 r/min, and the nitrate nitrogen in the sewage is further converted into nitrogen under the action of facultative microorganisms in the facultative tank (6);

3) and the effluent of the facultative tank (6) enters the water outlet pipe through self-flowing, and finally reaches the discharge standard.

7. The process of claim 6, wherein the suspended filler biofilm technology is used for treating sewage treatment equipment, and the process comprises the following steps: and (2) operating the aerobic reactor (1) and the facultative reactor (2) in the steps 1) and 2) for a period of time, then carrying out forward flushing, wherein the forward flushing period is 24-120h, each time is 30-60min, the forward flushing water is discharged into a sludge treatment unit for concentration and precipitation, the forward flushing water is precipitated to obtain a supernatant, and then the supernatant is returned to a downstream reactor of the forward flushing reactor for further treatment.

8. The process of claim 7, wherein the suspended filler biofilm technology is performed in a sewage treatment plant: when the aerobic reactor (1) and the facultative reactor (2) are positively flushed in the steps 1) and 2), the aeration stirring device and the stirring flushing device respectively output power for completely mixing suspended fillers and sewage in the aerobic reactor (1) and the facultative reactor (2) which are used oppositely, and simultaneously promote that the suspended fillers on the upper layer and the suspended fillers on the lower layer are both in a fluidized state, so that suspended matters accumulated between the suspended fillers and biomembranes aged on the surfaces of the suspended fillers are flushed out of the reactor.

9. The process of claim 8, wherein the suspended filler biofilm technology is used for treating sewage treatment equipment, and the process comprises the following steps: the water outlet end of the facultative tank (6) is communicated with the water inlet end of the secondary facultative tank, and the water inlet end of the secondary facultative tank is communicated with the water inlet end of the secondary aerobic tank;

10. The process of claim 9, wherein the suspended filler biofilm technology is performed in a sewage treatment plant: the water outlet end of the aerobic tank (14) is directly communicated with the water inlet end of the secondary aerobic tank, and the water outlet end of the secondary aerobic tank is communicated with solid-liquid separation equipment;

11. The process of claim 10, wherein the suspended filler biofilm technology is performed in a sewage treatment plant: the water inlet end of the aerobic tank (14) is communicated with the water outlet end of the front denitrification tank, the water outlet end of the aerobic tank (14) is communicated with the water inlet end of the nitrification tank, the water outlet end of the nitrification tank is communicated with the water inlet end of the rear denitrification tank, and the water outlet end of the rear denitrification tank is communicated with solid-liquid separation equipment;