CN110550737A - Granular sludge preparation method and reactor - Google Patents
Granular sludge preparation method and reactor Download PDFInfo
- Publication number
- CN110550737A CN110550737A CN201910771270.5A CN201910771270A CN110550737A CN 110550737 A CN110550737 A CN 110550737A CN 201910771270 A CN201910771270 A CN 201910771270A CN 110550737 A CN110550737 A CN 110550737A
- Authority
- CN
- China
- Prior art keywords
- zone
- anaerobic
- facultative
- granular sludge
- anaerobic zone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a granular sludge preparation method and a reactor, wherein the granular sludge preparation method comprises the steps of adding wastewater to be purified in an anaerobic zone of the reactor, stirring the anaerobic zone through a stirring device, adding a mixed solution of a flocculating agent and flocculent sludge into the anaerobic zone to enable the mixed concentration MLSS of the anaerobic zone to be 2500-3200 mg/L, gradually reducing the stirring speed of the stirring device until the stirring speed is stopped, enabling the mass ratio of the flocculating agent to the flocculent sludge in the mixed solution of the flocculating agent and the flocculent sludge to be 1: 0.8-0.3: 1, stirring the anaerobic zone through the stirring device again, adding the mixed solution of the flocculating agent and the flocculent sludge again to enable the mixed concentration MLSS of the anaerobic zone to be increased by 500-800 mg/L, repeating the previous step until the sludge settlement ratio SV 30: 5 in the anaerobic zone is smaller than or equal to 1:1.2, and completing the preparation of the granular sludge.
Description
Technical Field
the embodiment of the invention relates to the field of environmental protection, in particular to a granular sludge preparation method and a reactor.
Background
The activated sludge process is an aerobic biological treatment process commonly used in water treatment technology, and at present, a series of treatment processes including a Sequencing Batch Reactor (SBR) process, a cyclic activated sludge process (CASS) process, an oxidation ditch process, a biological filter process, a membrane bioreactor and the like have been developed gradually to improve the treatment efficiency and reduce the energy consumption. However, the water treatment processes are still based on flocculent sludge used in the traditional activated sludge method, and the flocculent sludge has low density and high water content, so the water treatment processes in the prior art have the problems of large occupied area, large aeration amount, sludge expansion and loss and the like due to the limitation of the flocculent sludge.
However, compared with the traditional flocculent sludge, the granular sludge (including anaerobic granular sludge and aerobic granular sludge) has high density and is easy to settle, the occupied area of relevant process equipment can be reduced while the wastewater purification effect is ensured, the granular sludge is not easy to run off, and higher organic load and water conservancy load can be borne, so that the operation is more stable. However, the existing granular sludge is slow in growth during preparation, the cycle of granular sludge formed by flocculation is long, and especially anaerobic granular sludge is formed, so that the application of the granular sludge in a water treatment process is limited, and the practicability of the granular sludge is reduced.
In addition, the combined use of the anaerobic granular sludge and the aerobic granular sludge can perform nitrogen and phosphorus removal on the wastewater; therefore, in the water treatment process, how to realize the combined efficient nitrogen and phosphorus removal of the anaerobic granular sludge and the aerobic granular sludge and keep the long-term circulating stable operation of the nitrogen and phosphorus removal treatment is a technical difficulty in the water treatment process using the granular sludge at present.
Disclosure of Invention
The embodiment of the invention provides a granular sludge preparation method and a reactor, aiming at the problems that the existing granular sludge preparation has slow growth, long formation period and difficult realization of combined efficient nitrogen and phosphorus removal of anaerobic granular sludge and aerobic granular sludge and long-term circulating stable operation of nitrogen and phosphorus removal treatment.
The technical scheme for solving the technical problems in the embodiment of the invention is to provide a preparation method of granular sludge, which comprises the following steps:
a: adding wastewater to be purified in an anaerobic zone of a reactor, and stirring the anaerobic zone by a stirring device;
b: adding a mixed solution of a flocculating agent and flocculent sludge into the anaerobic zone to enable the mixed concentration MLSS of the anaerobic zone to be 2500-3200 mg/L, and gradually reducing the stirring speed of a stirring device until the stirring is stopped, wherein the mass ratio of the flocculating agent to the flocculent sludge in the mixed solution of the flocculating agent and the flocculent sludge is 1: 0.8-0.3: 1;
c: stirring the anaerobic zone through a stirring device again, and adding a mixed solution of a flocculating agent and flocculent sludge into the anaerobic zone to improve the mixed concentration MLSS of the anaerobic zone by 500-800 mg/L;
d, repeating the step c until the sludge sedimentation ratio SV 30: SV 5 in the anaerobic zone is less than or equal to 1:1.2, completing the preparation of the granular sludge.
Preferably, the initial stirring speed of the stirring device in the step a is less than 150rpm, and the wastewater to be purified fills the whole anaerobic zone;
In the step b, after the mixed liquid of the flocculating agent and the flocculent sludge with the first mixed concentration is added into the anaerobic zone, the mixed concentration MLSS of the anaerobic zone is 2500-3200 mg/L, and the stirring of the stirring device is stopped within 10 minutes;
and c, executing the step b 2-3 hours after the step b is executed.
preferably, the method for preparing granular sludge further comprises the following steps performed after the step d is completed:
e: enabling the wastewater to be purified to flow into the anaerobic zone, and stirring the anaerobic zone by the stirring device to promote the wastewater and part of granular sludge in the anaerobic zone to flow into the facultative zone of the reactor;
f: aerating the facultative zone by a first aeration device, and promoting the wastewater and part of granular sludge in the facultative zone to flow into an aerobic zone of the reactor;
g: and aerating the aerobic zone by a second aeration device, and promoting the purified wastewater in the aerobic zone to flow out, at least partially returning the purified wastewater to the anaerobic zone by a first returning device, and partially returning granular sludge to the facultative zone by a second returning device.
Preferably, the chemical oxygen demand of the wastewater to be purified is 6325-9845 mg/L, and the temperature is 22-24 ℃; the flocculant is a chitosan flocculant or a microbial flocculant.
Preferably, the flow rate of the wastewater to be purified in the step e flowing into the anaerobic zone is 0.2-0.25 m 3/h, the stirring speed of the stirring device is 160-180 rpm, 20-80% of the granular sludge in the anaerobic zone flows into the facultative zone, and 30-70% of the granular sludge in the facultative zone in the step f flows into the aerobic zone.
preferably, after step g is performed, the ratio of the granular sludge in the anaerobic zone, the facultative zone and the aerobic zone is 2-4: 3.6-4: 2.4-4.
Preferably, the oxygen content of the anaerobic zone is less than 0.3mg/L, the oxygen content of the aerobic zone is more than 1.5mg/L, and the oxygen content of the facultative zone is in the range of 0.3-1.5 mg/L;
The facultative zone is also provided with a plurality of baffle plates, and the facultative zone forms a labyrinth-shaped water flowing channel at intervals through the baffle plates.
The invention also provides a reactor for preparing granular sludge by using the method, which comprises an anaerobic zone, a facultative zone and an aerobic zone which are relatively closed and are connected in sequence, wherein: the anaerobic zone, the facultative zone and the aerobic zone are respectively provided with a water inlet and a water outlet which are positioned at the top, the water outlet of the anaerobic zone is communicated with the water inlet of the facultative zone, and the water outlet of the facultative zone is communicated with the water inlet of the aerobic zone;
The anaerobic zone comprises a stirring device for stirring wastewater and a first baffle positioned in front of a water inlet end of a water inlet of the anaerobic zone, and one end of the first baffle extends to the bottom of the anaerobic zone.
preferably, the facultative zone comprises a first aeration device for providing oxygen and a plurality of baffle plates for changing the flow direction of waste water, the first aeration device is positioned at the bottom of the facultative zone, and one end of one baffle plate in front of the water inlet end of the water inlet of the facultative zone extends to the bottom of the facultative zone.
Preferably, the aerobic zone comprises a first reflux device for refluxing the treated wastewater in the aerobic zone to the anaerobic zone, a second reflux device for refluxing the granular sludge in the aerobic zone to the facultative zone, and a second aeration device for providing oxygen, wherein the second aeration device is positioned at the bottom of the aerobic zone, the second reflux device is respectively communicated with the aerobic zone and the facultative zone, and the first reflux device is respectively communicated with the water outlet of the aerobic zone and the water inlet of the anaerobic zone;
The aerobic zone is characterized by further comprising a second baffle positioned in front of a water inlet end of the anaerobic zone and an overflow device positioned on the inner side of a water outlet of the anaerobic zone, the overflow device is composed of a plurality of overflow plates which are vertically arranged and form a labyrinth shape, and one end of the second baffle extends to the bottom of the aerobic zone.
The granular sludge preparation method and the reactor provided by the embodiment of the invention have the following beneficial effects: the flocculation capacity of the wastewater can be enhanced by adding the mixed liquid of the flocculating agent and the flocculent sludge for multiple times, the sludge in the wastewater is rapidly gathered, the granulation process of the sludge is accelerated, the preparation forming efficiency is improved, the mixing concentration of the flocculating agent and the flocculent sludge in the wastewater can be effectively controlled in the adding mode of the mixed liquid, the preparation operation is more accurate, the preparation effect of the granular sludge is ensured, and the controllability is stronger; and, through setting up agitating unit and stirring anaerobic zone, can further strengthen the flocculation ability of waste water, make the suspended particle in the waste water can high-efficient contact, accelerate the efficiency that gathers of granule mud in the waste water, shorten the formation cycle of granule mud.
In addition, the granular sludge preparation method and the reactor provided by the embodiment of the invention are provided with the first reflux device and the second reflux device, the treated wastewater in the aerobic zone is refluxed to the anaerobic zone by the first reflux device, and the granular sludge in the aerobic zone is refluxed to the facultative zone by the second reflux device, so that the anaerobic granular sludge and the aerobic granular sludge are combined, the long-term circulation and stable operation of the nitrogen and phosphorus removal treatment can be ensured while the high-efficiency nitrogen and phosphorus removal is realized, and finally the granular sludge structure and the water treatment process purification efficiency are enhanced by means of the flow circulation mechanism.
Drawings
FIG. 1 is a schematic structural diagram of a reactor provided in an embodiment of the present invention;
FIG. 2 is a flow diagram of a method of producing a granular sludge provided by an embodiment of the present invention;
FIG. 3 is another flow diagram of a method of preparing granular sludge according to an embodiment of the present invention.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
as shown in fig. 1 and 2, the present invention provides a schematic structural diagram of a reactor and a flow chart of a granular sludge preparation method, and the granular sludge preparation method can be applied in the field of environmental protection, especially in wastewater treatment of a farm. The preparation method of the granular sludge in the embodiment comprises the following steps:
s11: wastewater to be purified (e.g., piggery wastewater) is introduced into an inlet 101 of an anaerobic zone 1 (providing a relatively closed and oxygen-free environment) of a reactor (e.g., a reactor as shown in fig. 1) and fills the entire anaerobic zone 1 with the wastewater to be purified, and then a stirring device 11 in the anaerobic zone 1 is activated and the wastewater to be purified in the anaerobic zone 1 is stirred by the stirring device 11.
In a specific operation, the stirring speed of the stirring device 11 in the step S11 should be controlled to be less than 150rpm to avoid that the stirring speed is too fast to adversely affect the flocculation effect of the granular sludge in the wastewater.
S12: adding a mixed solution of a flocculating agent (such as a chitosan flocculating agent, a microbial flocculating agent and the like) and flocculent sludge (specifically, fresh flocculent sludge inoculated from a secondary sedimentation tank of a domestic sewage treatment plant) into the anaerobic zone 1, and enabling the mixed concentration MLSS of the anaerobic zone 1 to be 2500-3200 mg/L. Specifically, the mixed liquid of the flocculant and the flocculent sludge can be added into the anaerobic chamber 1 from the feeding channel 12 of the anaerobic chamber 1. In addition, in practical application, the mixed concentration of the flocculant and the flocculent sludge in the wastewater in the anaerobic zone 1 can be determined according to practical situations, specifically according to the type of the added flocculant, and then the mixed concentration and the concentration of the mixed liquid required to be added are determined by calculation.
after the mixed liquid of the flocculating agent and the flocculent sludge is added, gradually reducing the stirring speed of the stirring device 11 until the stirring speed is stopped, and then standing for 2-3 hours to complete the operation of the step S12.
in practical applications, the flocculant of this embodiment may be a natural polymeric flocculant, that is, when the flocculant is a natural polymeric flocculant, for the aquaculture wastewater of a farm, the natural polymeric flocculant can rapidly capture organic pollutants in the wastewater and active bacteria in the flocculent sludge added together, so as to form composite flocs in the wastewater, and the composite flocs can accelerate the granulation process of the sludge, thereby reducing the formation cycle of the granular sludge. Moreover, because the hydraulic retention time in the anaerobic chamber 1 is long, anaerobic bacteria on the composite flocs can gradually consume and metabolize organic matters in the natural polymeric flocculant and the wastewater, and simultaneously release extracellular polymers to reinforce the structural strength of the particles, and through repeated flocculation, the particle structure is rapidly increased, the density is rapidly increased, and the granulation time is greatly shortened, so that the formation efficiency of the granular sludge is higher.
s13: and starting the stirring device 11 again, so that the stirring device 11 stirs the wastewater in the anaerobic zone 1 (the stirring speed is less than 150rpm), and then continuously adding the mixed liquid of the flocculating agent and the flocculent sludge into the anaerobic zone 1 until the mixed concentration MLSS in the anaerobic zone 1 is increased by 500-800 mg/L.
Preferably, in the mixed liquid of the flocculant and the flocculent sludge in the steps S12 and S13, the mass ratio of the flocculant to the flocculent sludge is 1: 0.8-0.3: 1; so that under the flocculation of flocculating agent, flocculent sludge can the efficient gathering form the graininess, improves granular sludge's preparation formation efficiency, and avoids the unreasonable flocculating ratio to make flocculating agent or flocculent sludge surplus in the waste water, causes the waste.
S14, repeating the step S13 until the sludge sedimentation ratio SV 30: SV 5 (namely, the volume percentage of sludge in 1000ml of wastewater after immersion and standing for 30 minutes) in the anaerobic zone 1 is less than or equal to 1:1.2, and finishing the preparation of the granular sludge (anaerobic granular sludge).
In practical application, the oxygen content of the wastewater in the anaerobic zone 1 in the whole process from step S11 to step S14 should be controlled to be less than 0.3mg/L, so as to avoid the influence of too high oxygen content on the structure formation of anaerobic colonies on the granular sludge.
according to the granular sludge preparation method, the flocculation capacity of the wastewater in the anaerobic zone 1 can be effectively enhanced by adding the mixed liquid of the flocculating agent and the flocculent sludge for multiple times, so that the sludge in the wastewater is rapidly gathered, the granulation process of the sludge is accelerated, and the preparation forming efficiency is improved; and still add flocculating agent and flocculent sludge to waste water with the mode of adding of mixed liquor, can effectively control the mixed concentration of flocculating agent and flocculent sludge in the waste water, make the preparation operation more accurate, guarantee granular sludge's preparation effect for the controllability is stronger.
In addition, the granular sludge is also stirred in the anaerobic zone 1 by the stirring device 11, so that the wastewater flows under the action of the stirring device 11, the flocculation capacity of the wastewater in the anaerobic chamber 1 can be further enhanced, suspended particles in the wastewater can be efficiently contacted, the preparation and aggregation efficiency of the granular sludge in the wastewater is accelerated, and the formation period of the granular sludge is shortened. In addition, step S11 allows the entire anaerobic zone 1 to be filled with the wastewater to be purified, thereby ensuring stable operation of the subsequent cycle of the reactor and improving the utilization rate of the space in the anaerobic zone 1.
Specifically, in step S12, after the mixed liquid of the flocculant and the flocculent sludge is added to the anaerobic zone 1 at the first mixing concentration, the mixing concentration MLSS of the anaerobic zone 1 is 2500-3200 mg/L, of course, the first mixing concentration of the mixed liquid of the flocculant and the flocculent sludge can be determined and adjusted according to the mixing concentration required by the anaerobic zone 1, the operation is convenient and fast, and the concentration of the mixed liquid of the flocculant and the flocculent sludge added in step S13 can be the same as or greater than the first mixing concentration.
In step S12, after the mixed liquid of the flocculant and the flocculent sludge is added, the stirring of the stirring device 11 is preferably stopped within 10 minutes, so as to avoid the initial aggregation of the sludge in the wastewater from being dispersed by impact due to insufficient adsorption force caused by the stirring of the stirring device 11, which is beneficial to strengthening the overall structure of the granular sludge.
As shown in fig. 3, the above-mentioned method for preparing granular sludge further includes the following steps performed after step S14 is completed:
S21: the wastewater to be purified flows into the anaerobic zone 1 continuously, and the anaerobic zone 1 is stirred by the stirring device 11, so that the flowing power of the wastewater is increased, and the wastewater and partial granular sludge in the anaerobic zone 1 are promoted to flow (overflow) into the facultative zone 2 of the reactor. Therefore, the granular sludge formed and immersed at the bottom of the anaerobic zone 1 can be stirred and floated by the stirring device 11, so that the granular sludge is promoted to be uniformly distributed in the integrated anaerobic zone 1, and partial granular sludge in the partial anaerobic zone 1 can be ensured to overflow to the facultative zone 2.
S22: the first aeration means 21 in the facultative zone 2 is activated and the facultative zone 2 is aerated by the first aeration means 21, so that the wastewater overflowing from the anaerobic zone 1 into the facultative zone 2 is supplied with oxygen, and the wastewater and a part of the granular sludge in the facultative zone 2 are caused to flow into the aerobic zone 3 of the reactor after the wastewater fills the whole facultative zone 2.
s23: start second aeration equipment 32 in the aerobic zone 3, aerate aerobic zone 3 through this second aeration equipment 32, can be for providing oxygen by the waste water of facultative zone 2 overflow to aerobic zone 3 in, make the waste water after the purification in the aerobic zone 3 go out, at least partly waste water after purifying flows back to anaerobic zone 1 through first reflux unit 4 and partial granule mud flows back to facultative zone 2 through second reflux unit 5 after the waste water is full of whole aerobic zone 3.
Particularly, set up first aeration equipment 21 in facultative zone 2, and set up second aeration equipment 32 in aerobic zone 3, the aeration state that corresponds of first aeration equipment 21 and second aeration equipment 32 is controlled respectively during the operation, can effectively improve the colony structure on the granule mud in the waste water in facultative zone 2 and aerobic zone 3, make the granule mud surface form facultative aerobic colony and the bacterial colony of aerobic advantage respectively, further degrade the organic matter in the waste water in facultative zone 2 and aerobic zone 3, realize efficient nitrogen and phosphorus removal and handle.
Specifically, the oxygen content of the aerobic zone 3 is preferably more than 1.5mg/L, and the oxygen content of the facultative zone 2 is preferably in the range of 0.3-1.5 mg/L, so that the distribution of facultative aerobic colonies and aerobic dominant colonies on the granular sludge is ensured, and the controllability is improved.
According to the granular sludge preparation method, the treated wastewater in the aerobic zone 3 flows back to the anaerobic zone 1 through the first backflow device 4, the granular sludge in the aerobic zone 3 flows back to the facultative zone 2 through the second backflow device 5, and the circular operation of the granular sludge preparation system is integrated, so that the anaerobic granular sludge and the aerobic granular sludge are combined, the long-term circular and stable operation of nitrogen and phosphorus removal treatment can be ensured while high-efficiency nitrogen and phosphorus removal is realized, and the granular sludge structure can be effectively strengthened and the purification efficiency of the water treatment process can be accelerated by means of the flow circulation mechanism.
the facultative zone 2 is further provided with a plurality of baffle plates 22, and the facultative zone 2 forms a labyrinth-shaped water flow channel at intervals by the plurality of baffle plates 22. Thereby, the flow direction of the wastewater in the water inlet and oxygen mixing chamber 2 of the anaerobic chamber 1 can be changed, and the flocculation effect of the granular sludge in the wastewater can be improved.
Example 1
In this example, the bioreactor shown in FIG. 1 can be used, which is initially inoculated with fresh flocculent sludge, non-granular sludge from the secondary sedimentation tank of a domestic sewage treatment plant.
The process for forming flocculation-enhanced granular sludge in this embodiment comprises the steps of, first, injecting and filling a certain pig-raising wastewater (COD 9845mg/L, water temperature 24 ℃ and water inflow rate 0.1m/h) in Henan into an anaerobic zone 1, then starting a stirring device 11 with a stirring speed of 60rpm, adding a mixture of a chitosan flocculant and flocculent sludge while stirring, and keeping the mixture concentration of the chitosan flocculant and flocculent sludge in the wastewater in the anaerobic zone 1 at 2500mg/L, then gradually reducing the speed of the stirring device 11 within 10 minutes until stopping, after standing for 3 hours, starting the stirring device 11 again with stirring, keeping the stirring speed of 60rpm of the stirring device 11, continuing to add the mixture of the chitosan flocculant and flocculent sludge in the anaerobic zone 1, and increasing the mixture concentration of the chitosan flocculant and flocculent sludge in the wastewater in the anaerobic zone 1 by 500mg/L, repeating the above steps until the sludge sedimentation ratio in the anaerobic zone 1 reaches 30: SV 84: 351.84: 351.3 mg/L, and ensuring the oxygen content in the wastewater in the anaerobic zone is less than 0.3 days.
After the granular sludge is formed, namely the sludge sedimentation ratio SV 30: SV 5 in the anaerobic chamber 1 reaches 1:1.2, the inflow velocity of the wastewater to be purified is increased to 0.2m/h, the stirring speed of the stirring device 11 is adjusted to 160rpm, meanwhile, the wastewater in the anaerobic zone 1 and 70 percent of the granular sludge are promoted to flow into the facultative zone 2, the first aeration device 21 is started to carry out aeration, the oxygen content of the wastewater in the facultative zone 2 is maintained to be 0.7mg/L, when the wastewater is filled in the whole facultative zone 2, the stirring speed of the stirring device 11 in the anaerobic zone 1 is reduced to 10rpm, then the inflow velocity of the wastewater to be purified is increased to 0.4m/h again, and the wastewater in the facultative zone 2 and 50 percent of the granular sludge are promoted to flow into the aerobic zone 3.
And (3) starting the second aeration device 32 of the aerobic zone 3 for aeration, and maintaining the oxygen content of the wastewater in the aerobic zone 3 to be 2.2mg/L, so that the ratio of the granular sludge in the anaerobic zone 1, the facultative zone 2 and the aerobic zone 3 is kept to be 2:4: 4. Then adjusting the inflow velocity of the wastewater to be purified to 0.25m/h, adjusting the stirring speed of the stirring device 11 of the anaerobic zone 1 to 20rpm, adjusting the oxygen content of the wastewater in the facultative zone 2 to 1.2mg/L by adjusting the first aeration device 21, and adjusting the oxygen content of the second aeration device 32 to 2.4mg/L, finally starting and controlling the first reflux device 4 and the second reflux device 5 of the aerobic zone 3 according to a first preset flow to perform the circulating flow of the whole preparation system, and starting the purification treatment of the wastewater.
In practical applications, the first preset flow of the first reflux device 4 and the second reflux device 5 for controlling the aerobic zone 3 is to reflux 30% of the purified wastewater in the aerobic chamber 3 to the anaerobic zone 1 every day, reflux 40% of the granular sludge in the aerobic zone 3 to the facultative zone 2 every two days, and make the reflux speed of the first reflux device 4 and the second reflux device 5 be 2 m/h. Therefore, the equivalent amount of the granular sludge in the facultative zone 2 and the aerobic zone 3 can be ensured, the balance is kept, and the granular sludge circularly flows between the facultative zone 2 and the aerobic zone 3 to strengthen the granular sludge structure and the treatment efficiency thereof.
Example 2
the bioreactor shown in FIG. 1 can also be used in this example, which is initially inoculated with fresh flocculent sludge, non-particulate sludge, from the secondary sedimentation tank of a domestic sewage treatment plant. Namely the flocculant is a microbial flocculant.
30 5the flocculation-enhanced granular sludge forming process in this embodiment comprises the steps of first, injecting and filling sewage (COD 6325mg/L, water temperature 22 ℃ and water inflow rate 0.1m/h) from a chicken farm in Henan into the anaerobic zone 1, then starting the stirring apparatus 11 with a stirring speed of 40rpm, adding a mixed solution of a microbial flocculant (a flocculant prepared from a product produced by microbial metabolism) and flocculent sludge while stirring, and keeping the mixed concentration of the microbial flocculant and flocculent sludge in the wastewater in the anaerobic zone 1 at 3200mg/L, then gradually reducing the speed of the stirring apparatus 11 within 10 minutes until stopping, standing for 2 hours, starting the stirring apparatus 11 again with the stirring apparatus 11 kept at a stirring speed of 40rpm, continuing to add the mixed solution of the microbial flocculant and flocculent sludge in the anaerobic zone 1, increasing the mixed concentration of the microbial flocculant and flocculent sludge in the wastewater in the anaerobic zone 1 by 800mg/L, repeating the above steps until the oxygen content of the mixed solution in the anaerobic zone 1 SV 1 is increased to 353.84 days, and the whole anaerobic zone is maintained at a sedimentation ratio of SV 1.3: 351.83.3 days.
After the granular sludge is formed, the inflow velocity of the wastewater to be purified is increased to 0.25m/h, the stirring speed of the stirring device 11 is adjusted to 180rpm, and simultaneously, the wastewater in the anaerobic zone 1 and 60 percent of the granular sludge are promoted to flow into the facultative zone 2. The first aeration device 21 is started to carry out aeration, and the oxygen content of the wastewater in the facultative zone 2 is maintained at 0.9 mg/L. When the whole facultative zone 2 is filled with the wastewater, the stirring speed of the stirring device 11 in the anaerobic zone 1 is reduced to 20rpm, then the inflow velocity of the wastewater to be purified is increased to 0.3m/h again, and the wastewater in the facultative zone 2 and 40% of granular sludge are promoted to flow into the aerobic zone 3.
And (3) starting the second aeration device 32 of the aerobic zone 3 for aeration, and maintaining the oxygen content of the wastewater in the aerobic zone 3 to be 2.2mg/L, so that the ratio of the granular sludge in the anaerobic zone 1, the facultative zone 2 and the aerobic zone 3 is kept to be 4:3.6: 2.4. Then adjusting the inflow velocity of the wastewater to be purified to 0.18m/h, adjusting the stirring speed of the stirring device 11 of the anaerobic zone 1 to 26rpm, adjusting the oxygen content of the wastewater in the facultative zone 2 to 1.4mg/L by adjusting the first aeration device 21, and adjusting the oxygen content of the second aeration device 32 to 2mg/L, finally starting and controlling the first reflux device 4 and the second reflux device 5 of the aerobic zone 3 according to a second preset flow to perform the circulating flow of the whole granular sludge preparation system, and starting the purification treatment of the wastewater.
In practical applications, the second preset flow of controlling the first reflux unit 4 and the second reflux unit 5 of the aerobic zone 3 is to reflux 50% of the purified wastewater in the aerobic chamber 3 to the anaerobic zone 1 every day, reflux 60% of the granular sludge in the aerobic zone 3 to the facultative zone 2 every two days, and make the reflux speed of the first reflux unit 4 and the second reflux unit 5 be 2.4 m/h. Therefore, the equivalent amount of the granular sludge in the facultative zone 2 and the aerobic zone 3 can be ensured, the balance is kept, and the granular sludge circularly flows between the facultative zone 2 and the aerobic zone 3 to strengthen the granular sludge structure and the treatment efficiency thereof.
The invention also provides a reactor for preparing granular sludge by using the method, which comprises an anaerobic zone 1, a facultative zone 2 and an aerobic zone 3 which are relatively closed and are connected in sequence, wherein: the anaerobic zone 1, the facultative zone 2 and the aerobic zone 3 are respectively provided with a water inlet and a water outlet which are positioned at the top, the water outlet of the anaerobic zone 1 is communicated with the water inlet of the facultative zone 2, and the water outlet of the facultative zone 2 is communicated with the water inlet of the aerobic zone 3; simple structure can effectively reduce the volume, reduces occupation space, and can realize the continuous circulation flow of the preparation system of whole granular sludge.
for the flocculation efficiency of granular sludge in the waste water in the anaerobic zone 1 with higher speed, the anaerobic zone 1 is provided with a stirring device 11 for stirring the waste water, the anaerobic zone 1 is also provided with a first baffle 12 positioned in front of the water inlet end of the water inlet, and one end of the first baffle 12 extends to the bottom of the anaerobic zone 1, so that the waste water to be purified can enter the anaerobic zone 1 from the bottom position of the anaerobic zone 1 while ensuring the convenience of the operation of the waste water to be purified entering the anaerobic zone 1, the granular sludge deposited at the bottom in the waste water in the anaerobic zone 1 can be effectively stirred, the granular sludge is enabled to float and flow, and the purification effect is prevented from being influenced by the uneven distribution of the granular sludge in the anaerobic zone 1.
The facultative zone 2 comprises a first aeration device 21 for providing oxygen for the wastewater in the facultative zone 2 and a plurality of baffle plates 22 for changing the flow direction of the wastewater in the facultative zone 2; specifically, the first aeration device 21 is located at the bottom of the facultative zone 2, and one end of one baffle plate 22 near the front of the water inlet end of the facultative zone 2 extends to the bottom of the facultative zone 2, therefore, the first aeration device 21 arranged at the bottom and one baffle plate 22 extending to the bottom of the facultative zone 2 cooperate with each other to enable the granular sludge deposited at the bottom of the facultative chamber 2 to float and flow, and the purification effect of the granular sludge on the wastewater in the facultative chamber 2 is improved.
in particular, the aerobic zone 3 comprises a first reflux unit 4 for refluxing the treated wastewater of the aerobic zone 3 to the anaerobic zone 1, a second reflux unit 5 for refluxing the granular sludge of the aerobic zone 3 to the facultative zone 2, and a second aeration unit 32 for supplying oxygen, and the second aeration unit 32 is located at the bottom of the aerobic zone 3, and can efficiently agitate the granular sludge deposited at the bottom of the aerobic chamber 3. In addition, the second reflux device 5 is respectively communicated with the aerobic zone 3 and the facultative zone 2, and the first reflux device 4 is respectively communicated with the water outlet of the aerobic zone 3 and the water inlet of the anaerobic zone, so that the continuous circulating flow of the whole granular sludge preparation system is ensured, and the anaerobic granular sludge and the aerobic granular sludge can continuously combine to efficiently remove nitrogen and phosphorus.
Similarly, the aerobic zone 3 further comprises a second baffle 31 positioned in front of the water inlet end of the water inlet of the anaerobic zone 1, and one end of the second baffle 31 extends to the bottom of the aerobic zone 3, so that the granular sludge deposited at the bottom of the aerobic chamber 3 can be driven by matching with the second aeration device 32, and the wastewater treatment effect in the aerobic chamber 3 is improved. In addition, the anaerobic zone 1 is also provided with an overflow device 33 positioned at the inner side of the water outlet, and the overflow device 33 is composed of a plurality of vertically arranged and labyrinth-shaped overflow plates, so that the purified wastewater can be further precipitated and treated, and the purification effect is improved.
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The preparation method of the granular sludge is characterized by comprising the following steps:
a: adding wastewater to be purified in an anaerobic zone of a reactor, and stirring the anaerobic zone by a stirring device;
b: adding a mixed solution of a flocculating agent and flocculent sludge into the anaerobic zone to enable the mixed concentration MLSS of the anaerobic zone to be 2500-3200 mg/L, and gradually reducing the stirring speed of a stirring device until the stirring is stopped, wherein the mass ratio of the flocculating agent to the flocculent sludge in the mixed solution of the flocculating agent and the flocculent sludge is 1: 0.8-0.3: 1;
c: stirring the anaerobic zone through a stirring device again, and adding a mixed solution of a flocculating agent and flocculent sludge into the anaerobic zone to improve the mixed concentration MLSS of the anaerobic zone by 500-800 mg/L;
d, repeating the step c until the sludge sedimentation ratio SV 30: SV 5 in the anaerobic zone is less than or equal to 1:1.2, completing the preparation of the granular sludge.
2. The method of producing granular sludge according to claim 1 wherein the stirring means in step a has an initial stirring speed of less than 150rpm and the wastewater to be purified fills the entire anaerobic zone;
In the step b, after the mixed liquid of the flocculating agent and the flocculent sludge with the first mixed concentration is added into the anaerobic zone, the mixed concentration MLSS of the anaerobic zone is 2500-3200 mg/L, and the stirring of the stirring device is stopped within 10 minutes;
And c, executing the step b 2-3 hours after the step b is executed.
3. The granular sludge producing method according to claim 1 or 2, wherein the granular sludge producing method further comprises the following steps performed after completion of the step d:
e: enabling the wastewater to be purified to flow into the anaerobic zone, and stirring the anaerobic zone by the stirring device to promote the wastewater and part of granular sludge in the anaerobic zone to flow into the facultative zone of the reactor;
f: aerating the facultative zone by a first aeration device, and promoting the wastewater and part of granular sludge in the facultative zone to flow into an aerobic zone of the reactor;
g: and aerating the aerobic zone by a second aeration device, and promoting the purified wastewater in the aerobic zone to flow out, at least partially returning the purified wastewater to the anaerobic zone by a first returning device, and partially returning granular sludge to the facultative zone by a second returning device.
4. The granular sludge preparation method according to claim 3, wherein the chemical oxygen demand of the wastewater to be purified is 6325-9845 mg/L, and the temperature is 22-24 ℃; the flocculant is a chitosan flocculant or a microbial flocculant.
5. The method for preparing granular sludge according to claim 4, wherein the flow rate of the wastewater to be purified flowing into the anaerobic zone in the step e is 0.2-0.25 m 3/h, the stirring speed of the stirring device is 160-180 rpm, 20-80% of the granular sludge in the anaerobic zone flows into the facultative zone, and 30-70% of the granular sludge in the facultative zone flows into the aerobic zone in the step f.
6. The granular sludge preparation method according to claim 4, wherein after the step g is performed, the ratio of the granular sludge in the anaerobic zone, the facultative zone and the aerobic zone is 2-4: 3.6-4: 2.4-4.
7. the granular sludge preparation method according to claim 3, wherein the oxygen content of the anaerobic zone is less than 0.3mg/L, the oxygen content of the aerobic zone is more than 1.5mg/L, and the oxygen content of the facultative zone is in the range of 0.3-1.5 mg/L;
The facultative zone is also provided with a plurality of baffle plates, and the facultative zone forms a labyrinth-shaped water flowing channel at intervals through the baffle plates.
8. A reactor for the production of a granular sludge using the method according to any one of claims 1 to 7, wherein the reactor comprises an anaerobic zone, a facultative zone and an aerobic zone which are relatively closed and connected in series, wherein: the anaerobic zone, the facultative zone and the aerobic zone are respectively provided with a water inlet and a water outlet which are positioned at the top, the water outlet of the anaerobic zone is communicated with the water inlet of the facultative zone, and the water outlet of the facultative zone is communicated with the water inlet of the aerobic zone;
The anaerobic zone comprises a stirring device for stirring wastewater and a first baffle positioned in front of a water inlet end of a water inlet of the anaerobic zone, and one end of the first baffle extends to the bottom of the anaerobic zone.
9. The reactor according to claim 8, wherein the facultative zone includes a first aeration means for providing oxygen and a plurality of baffles for changing the flow direction of the waste water, the first aeration means being located at the bottom of the facultative zone, and one end of one of the baffles in front of the water inlet end of the water inlet of the facultative zone extending to the bottom of the facultative zone.
10. the reactor of claim 8, wherein the aerobic zone comprises a first reflux device for refluxing treated wastewater of the aerobic zone to the anaerobic zone, a second reflux device for refluxing granular sludge of the aerobic zone to the facultative zone, and a second aeration device for providing oxygen, the second aeration device being located at the bottom of the aerobic zone, and the second reflux device being communicated with the aerobic zone and the facultative zone respectively, and the first reflux device being communicated with a water outlet of the aerobic zone and a water inlet of the anaerobic zone respectively;
the aerobic zone is characterized by further comprising a second baffle positioned in front of a water inlet end of the anaerobic zone and an overflow device positioned on the inner side of a water outlet of the anaerobic zone, the overflow device is composed of a plurality of overflow plates which are vertically arranged and form a labyrinth shape, and one end of the second baffle extends to the bottom of the aerobic zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910771270.5A CN110550737B (en) | 2019-08-21 | 2019-08-21 | Granular sludge preparation method and reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910771270.5A CN110550737B (en) | 2019-08-21 | 2019-08-21 | Granular sludge preparation method and reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110550737A true CN110550737A (en) | 2019-12-10 |
| CN110550737B CN110550737B (en) | 2022-04-29 |
Family
ID=68737834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910771270.5A Active CN110550737B (en) | 2019-08-21 | 2019-08-21 | Granular sludge preparation method and reactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110550737B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111470620A (en) * | 2020-03-31 | 2020-07-31 | 深圳市万创青绿环境工程有限公司 | CANON granular sludge granulation culture method and reactor thereof |
| CN111470616A (en) * | 2020-03-31 | 2020-07-31 | 深圳市万创青绿环境工程有限公司 | Culture method for granulating aerobic granular sludge and reactor thereof |
| CN111470619A (en) * | 2020-03-31 | 2020-07-31 | 深圳市万创青绿环境工程有限公司 | SNAD granular sludge granulation culture method and reactor thereof |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887737A (en) * | 2006-07-14 | 2007-01-03 | 太原理工大学 | Fast culture process in anaerobic grain sludge |
| JP2008086862A (en) * | 2006-09-29 | 2008-04-17 | Nippon Paper Industries Co Ltd | Anaerobic treatment method and arrangement |
| CN101428907A (en) * | 2008-12-18 | 2009-05-13 | 浙江大学 | Method for cultivation of particle sewage sludge in anaerobic/oxygen lack-aerobic sequencing batch reactor |
| CN101767873A (en) * | 2010-01-14 | 2010-07-07 | 四川大学 | Method for quickly culturing anaerobic hydrogen-producing granular sludge |
| CN102219300A (en) * | 2011-05-16 | 2011-10-19 | 苏州科技学院 | Method for culturing anaerobic granular sludge in anaerobic baffled reactor |
| CN102320689A (en) * | 2011-08-05 | 2012-01-18 | 北京城市排水集团有限责任公司 | Continuous flow granular sludge reactor and running method |
| CN102557248A (en) * | 2012-01-13 | 2012-07-11 | 西南化工研究设计院 | Method for fast culturing anaerobic granular sludge |
| CN102701440A (en) * | 2012-05-07 | 2012-10-03 | 吉安集团股份有限公司 | Reagent and method for fast culturing granular sludge in IC reactor |
| CN103043792A (en) * | 2013-01-19 | 2013-04-17 | 东北电力大学 | Method and device for cultivating anaerobic granular sludge |
| CN103539262A (en) * | 2013-10-11 | 2014-01-29 | 西安建筑科技大学 | Improved A<2>O sewage treatment method |
| CN103663725A (en) * | 2013-12-05 | 2014-03-26 | 北京交通大学 | Continuous flow biological denitrification method based on granular sludge, and apparatus |
| CN104496019A (en) * | 2014-12-23 | 2015-04-08 | 李开明 | Method for culturing granular sludge in anaerobic reactor |
| CN105198080A (en) * | 2015-10-29 | 2015-12-30 | 中国石油天然气集团公司 | Anaerobic particle sludge rapid culture method suitable for oil refining and chemical engineering wastewater treatment |
| CN105540834A (en) * | 2015-12-29 | 2016-05-04 | 杭州师范大学 | Culture method of anaerobic denitrification granular sludge |
| CN106396096A (en) * | 2016-11-04 | 2017-02-15 | 苏州依斯倍环保装备科技有限公司 | Method and device for culturing anaerobic granular sludge |
| CN107619108A (en) * | 2017-09-20 | 2018-01-23 | 苏州科技大学 | Anaerobic grain sludge cultural method and culture apparatus |
-
2019
- 2019-08-21 CN CN201910771270.5A patent/CN110550737B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887737A (en) * | 2006-07-14 | 2007-01-03 | 太原理工大学 | Fast culture process in anaerobic grain sludge |
| JP2008086862A (en) * | 2006-09-29 | 2008-04-17 | Nippon Paper Industries Co Ltd | Anaerobic treatment method and arrangement |
| CN101428907A (en) * | 2008-12-18 | 2009-05-13 | 浙江大学 | Method for cultivation of particle sewage sludge in anaerobic/oxygen lack-aerobic sequencing batch reactor |
| CN101767873A (en) * | 2010-01-14 | 2010-07-07 | 四川大学 | Method for quickly culturing anaerobic hydrogen-producing granular sludge |
| CN102219300A (en) * | 2011-05-16 | 2011-10-19 | 苏州科技学院 | Method for culturing anaerobic granular sludge in anaerobic baffled reactor |
| CN102320689A (en) * | 2011-08-05 | 2012-01-18 | 北京城市排水集团有限责任公司 | Continuous flow granular sludge reactor and running method |
| CN102557248A (en) * | 2012-01-13 | 2012-07-11 | 西南化工研究设计院 | Method for fast culturing anaerobic granular sludge |
| CN102701440A (en) * | 2012-05-07 | 2012-10-03 | 吉安集团股份有限公司 | Reagent and method for fast culturing granular sludge in IC reactor |
| CN103043792A (en) * | 2013-01-19 | 2013-04-17 | 东北电力大学 | Method and device for cultivating anaerobic granular sludge |
| CN103539262A (en) * | 2013-10-11 | 2014-01-29 | 西安建筑科技大学 | Improved A<2>O sewage treatment method |
| CN103663725A (en) * | 2013-12-05 | 2014-03-26 | 北京交通大学 | Continuous flow biological denitrification method based on granular sludge, and apparatus |
| CN104496019A (en) * | 2014-12-23 | 2015-04-08 | 李开明 | Method for culturing granular sludge in anaerobic reactor |
| CN105198080A (en) * | 2015-10-29 | 2015-12-30 | 中国石油天然气集团公司 | Anaerobic particle sludge rapid culture method suitable for oil refining and chemical engineering wastewater treatment |
| CN105540834A (en) * | 2015-12-29 | 2016-05-04 | 杭州师范大学 | Culture method of anaerobic denitrification granular sludge |
| CN106396096A (en) * | 2016-11-04 | 2017-02-15 | 苏州依斯倍环保装备科技有限公司 | Method and device for culturing anaerobic granular sludge |
| CN107619108A (en) * | 2017-09-20 | 2018-01-23 | 苏州科技大学 | Anaerobic grain sludge cultural method and culture apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 王建兵等: "《煤化工高浓度有机废水处理技术及工程实例》", 31 July 2015, 中国建材工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111470620A (en) * | 2020-03-31 | 2020-07-31 | 深圳市万创青绿环境工程有限公司 | CANON granular sludge granulation culture method and reactor thereof |
| CN111470616A (en) * | 2020-03-31 | 2020-07-31 | 深圳市万创青绿环境工程有限公司 | Culture method for granulating aerobic granular sludge and reactor thereof |
| CN111470619A (en) * | 2020-03-31 | 2020-07-31 | 深圳市万创青绿环境工程有限公司 | SNAD granular sludge granulation culture method and reactor thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110550737B (en) | 2022-04-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113480004B (en) | Method for deeply denitrifying urban sewage after carbon and phosphorus capture and realizing phosphorus recovery through PDA (personal digital Assistant) | |
| CN110550737B (en) | Granular sludge preparation method and reactor | |
| CN104230097A (en) | Breeding sewage treatment method | |
| CN101891344B (en) | Activated sludge-biomembrane combined circulating flow denitrification and desophorization integrated sewage treatment device and method | |
| CN103539262B (en) | Improved A<2>O sewage treatment method | |
| CN103121754A (en) | Denitrification and dephosphorization technique | |
| CN102320689A (en) | Continuous flow granular sludge reactor and running method | |
| CN202542997U (en) | Half shortcut nitrification/ anaerobic ammonia oxidation nitrogen and phosphorus removal device for urban sewage | |
| CN113149213B (en) | Device and method for rapidly culturing aerobic granular sludge and treating low-carbon-nitrogen-ratio urban sewage | |
| CN102887608A (en) | Activated sludge-biofilm reactor and treatment method of organic wastewater | |
| CN106673193A (en) | Method for performing biological contact and oxidation treatment of low C/N sewage through anaerobic fermentation coupling A<2>/O | |
| CN111099726A (en) | Synchronous denitrification and dephosphorization double-sludge sewage treatment system and treatment process thereof | |
| CN107043164B (en) | Sewage treatment device and method for denitrification dephosphorization series-connection integrated anaerobic ammonia oxidation | |
| CN110171904B (en) | Continuous flow AAO dephosphorization and partial denitrification series-connection combined type fixed biological membrane activated sludge autotrophic denitrification device and method | |
| CN110217887B (en) | Electronic metering balance coupling control method for treating livestock and poultry breeding anaerobic digestive fluid | |
| CN103073156B (en) | Method for treating poly butylene succinate production waste water by biochemical method | |
| CN102491602A (en) | Sequencing batch domestic sewage treatment method for forcibly denitrifying and dephosphorizing, and recycling phosphorus | |
| CN106007171A (en) | Integrated sludge reduction recycling and N2O emission reduction sewage treatment device and method for operating same | |
| CN101693583B (en) | Biochemical comprehensive treatment method for 1, 3-propylene glycol fermentation organism waste water | |
| CN107082492B (en) | Low-consumption continuous flow domestic sewage treatment reactor and nitrogen and phosphorus efficient removal method | |
| CN108751413A (en) | The circulating anoxic of long residence time strengthens town sewage denitrification and dephosphorization method | |
| CN202046974U (en) | Highly efficient treatment system for denitrification and dephosphorization of urban sewage | |
| CN115403150B (en) | Device and method for treating low-carbon-nitrogen-ratio urban sewage by using IFAS-SBR | |
| CN111592104A (en) | Short-range efficient biological treatment device and treatment method for kitchen waste digestive juice | |
| CN203866153U (en) | Improved reinforced A2/O denitrogenation and dephosphorization treating device for municipal sewage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Haibo Inventor after: Li Changhan Inventor after: Yang Weiming Inventor after: Wang Guangzhi Inventor after: Tan Yuang Inventor after: Tan Huajie Inventor before: Li Haibo Inventor before: Li Changhan Inventor before: Yang Weiming Inventor before: Wang Guangzhi Inventor before: Tan Yuang |
|
| CB03 | Change of inventor or designer information | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100037 Room 501, 5th floor, building 36, 21 Chegongzhuang street, Xicheng District, Beijing Patentee after: WANCHUANG QINGLYU (BEIJING) ENVIRONMENTAL TECHNOLOGY Co.,Ltd. Patentee after: Shenzhen Liuyuan Enterprise Development Co.,Ltd. Patentee after: DONGGUAN VANKE BUILDING TECHNIQUE RESEARCH Co.,Ltd. Address before: 100037 Room 501, 5th floor, building 36, 21 Chegongzhuang street, Xicheng District, Beijing Patentee before: WANCHUANG QINGLYU (BEIJING) ENVIRONMENTAL TECHNOLOGY Co.,Ltd. Patentee before: Shenzhen sixth Garden Agricultural Development Co.,Ltd. Patentee before: DONGGUAN VANKE BUILDING TECHNIQUE RESEARCH Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |