CN207903981U - A kind of efficient up-flow biological reaction apparatus - Google Patents
A kind of efficient up-flow biological reaction apparatus Download PDFInfo
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- CN207903981U CN207903981U CN201721842530.6U CN201721842530U CN207903981U CN 207903981 U CN207903981 U CN 207903981U CN 201721842530 U CN201721842530 U CN 201721842530U CN 207903981 U CN207903981 U CN 207903981U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The utility model is related to a kind of efficient up-flow biological reaction apparatus.Described device includes reaction unit ontology, is disposed with reaction tank, the ponds MBBR and the ponds MBR in the reaction unit ontology from the bottom to top；The advantages such as the utility model by reaction tank, the ponds MBBR and the ponds MBR being combined into one reaction system, has wastewater treatment efficiency more preferably using tower structure, and effluent quality is more excellent, and floor space is small, the construction period is short, high degree of automation, construction cost are low.Meanwhile MBR membrane modules disposed in parallel have been selected, the contact area of the bubble and membrane module of aerator generation can be greatly improved, the pollution problem of membrane module is effectively reduced.The utility model can effectively control effluent quality, and carry out the online backwash of specific aim to each group of membrane module, without separately setting Membrane cleaning pond, the continuous operation of realization device by independent regulation and control membrane module.In addition, by the setting of gas-washing device, fouling membrane can be further decreased.
Description
Technical field
The utility model belongs to sewage treatment field, more particularly, to a kind of efficient up-flow biological reaction apparatus.
Background technology
At present in sewage water treatment method, activated sludge process is more mature, and application is wider, but its there are still many disadvantages
With deficiency, such as floor space is wide, capital cost is high；The adaptability that the technique changes water quality and quantity simultaneously is relatively low, operation effect
Fruit is easily influenced by water quality, water variation；
Moving bed biofilm reactor（That is MBBR）It is a kind of to have both traditional activated sludge process and biological contact oxidation process
A kind of new and effective combination process processing method of the two advantage；Its principle is directly thrown with the floating stuffing of proportion close to water
It is added to the active carrier as microorganism in aeration tank, fluidized state is in by aeration and the castering action of flow, to
The utilization rate for improving oxygen achievees the purpose that efficient degradation organic pollution.
Membrane bioreactor（That is MBR）It is a kind of Novel sewage organically combining membrane separation technique and biologic treating technique
Treatment technology, the technology have the characteristics that sludge sludge age is high, floor space is small, stable effluent quality, can make up well
The shortcomings that activated sludge process with it is insufficient, but in the membrane bioreactor operational process, due to the negative-pressure ward effect of production water pump,
Cause activated sludge constantly to be accumulated in film surface, to cause membrane flux to reduce, even results in Pore Blocking；Therefore chemistry is clear
It is the essential step for ensureing membrane bioreactor and running steadily in the long term to wash；Conventional cleaning way mainly has on-line cleaning
With offline cleaning two ways, the drawbacks such as that there are dosings is big for on-line cleaning, and medicament utilization rate is low；And clean offline need to be by film
Component lifts out reaction tank, and separately sets Membrane cleaning pond and cleaned to membrane module, considerably increases labor intensity, and make reaction system
System is unable to continuous operation, reduces sewage treating efficiency.
Currently, existing sewage disposal system mostly uses the separate units knots such as traditional good/anaerobic pond or the pond MBBR, MBR
The mode of structure combination forms；These integrated waste water treatment systems have take up a large area, the construction period is long, it is of high cost, be difficult to
The problems such as place arrangement of land used anxiety.
Therefore, design that a kind of sewage treating efficiency is high, floor space is few, fouling membrane is small and the comprehensive sewage of continuous service
Processing unit has important economic value and application value.
Invention content
The purpose of the utility model is to overcome existing sewage-treatment plant fouling membranes seriously, is unable to continuous operation, takes up an area
The defect that area is big and operating cost is high provides a kind of efficient up-flow biological reaction apparatus.Life provided by the utility model
Object reaction unit uses integral type tower structure, floor space small；It simultaneously can be largely by the MBR membrane modules of specific setting
Ground reduces fouling membrane, improves the service life of membrane module, realizes that reaction unit produces water and backwash simultaneously, runs without interruption, to
Improve sewage treating efficiency.
To realize above-mentioned purpose of utility model, the utility model adopts the following technical solution：
A kind of efficient up-flow biological reaction apparatus, the biological reaction apparatus include reaction unit ontology, described anti-
It answers and is disposed with reaction tank, the ponds MBBR and the ponds MBR in device body from the bottom to top；The bottom and top of the reaction unit ontology
Portion is provided with evacuation port and pressure relief device；The bottom and top of the reaction tank are respectively arranged with water distributor and three phase separator,
It is provided with discharge duct on the three phase separator；Bottom, inside and the top in the ponds MBBR are respectively arranged with the first aeration
Device, filler and filter plate, the ponds MBBR are connected by the ponds MBBR reflux line with reaction tank, the ponds MBBR reflux line
On be provided with the first sewage backflow pump；The ponds MBR include being set to the second aerator of bottom and being parallel to described second
The MBR membrane modules of aerator are provided with drainage pipeline on the MBR membrane modules；The ponds MBR pass through the ponds MBR reflux line
It is connected with the ponds MBBR, the second sewage backflow pump is provided on the reflux line of the ponds MBR.
The utility model uses tower structure by reaction tank, the ponds MBBR and the ponds MBR being combined into one reaction system.Entirely
Sewage disposal process is：Sewage is introduced into from water distributor in reaction unit, after reacted pond processing, is realized by three phase separator dirty
The separation of mud, exhaust gas and waste water；Sludge, which can transport, to be continuing with into reaction tank as activated sludge；Exhaust gas can pass through exhaust pipe
Road drains into the emission-control equipment outside reaction unit；Waste water then rises into and carries out Air Exposure in the ponds MBBR, and removal is organic
While pollutant by mineralized nitrogen be nitrate nitrogen；Treated, and foul water fraction can be back to reaction tank progress by reflux line
Denitrification reaction, the filtration that remaining sewage can pass upward through filter plate enter the ponds MBR；After being further processed of the ponds MBR, one
Part of contaminated water can be back to the ponds MBBR by reflux line, and the reaction was continued, and a part of sewage can be in the centrifugation of MBR membrane modules
Lower discharge, reaches reuse standard.Reaction unit provided by the utility model has by reaction tank, the combination in the ponds MBBR and MBR
More preferably, effluent quality is more excellent for wastewater treatment efficiency, and floor space is small, the construction period is short, high degree of automation, construction cost are low etc.
Advantage.Three phase separator is used simultaneously, reaction tank is made to realize effectively dividing for solid-liquid-gas in the case where not needing additionaling power
From preferably retaining activated sludge, so that activated sludge in reaction tank is had, sludge sludge age is high, organic pollutant degradation effect
Well, the advantages that nutriments removal rate such as N, P is high；By the way that discharge duct is arranged on three phase separator, reaction tank can be generated
Foul smell be expelled directly out outside reaction unit and dispose, the foul smell for avoiding reaction tank generation generates not the follow-up ponds MBBR aerobic reaction
Good influence.
In addition to this, the utility model has also selected the MBR membrane modules for being parallel to the setting of MBR bottom of pond portion.In MBR reaction tanks
Due to the centrifugation of film, pollutant and other microorganisms are trapped in reaction tank interior sewage, and treated water then passes through
Cross negative-pressure ward, qualified discharge；Due to negative-pressure ward etc., colloidal solid and pollutant in reaction tank can be attached to film wire
Surface leads to Pore Blocking, to reduce the flux of biomembrane, or even reduces the service life of MBR films.The utility model
MBR membrane modules disposed in parallel are selected, the contact area of the bubble and membrane module of aerator generation can be greatly improved, pass through gas
The shake of bubble acts on, and effectively reduces the pollution problem of membrane module.
Preferably, the reaction tank is anaerobic pond or anoxic pond.
Preferably, the discharge duct is vertically arranged and runs through the top of the reaction unit ontology.
Preferably, the air purge pipeline of the first valve of band is provided with below the MBR membrane modules.
By the air purge pipeline being arranged below membrane module, membrane module can be cleaned, further reduced fouling membrane
Degree extends the service life of membrane module.Under normal circumstances, one or more groups of MBR films may be provided with according to the process demand of sewage
Component, but the considerations of for effluent characteristics and efficiency, generally select multigroup.For multigroup MBR membrane modules, because being respectively provided with below
There is individual air purge pipeline, the air inlet of air purge pipeline can be flexibly controlled according to the requirement of water quality and the pollution condition of MBR membrane modules
Amount improves effluent quality, extends the service life of membrane module to targetedly reduce fouling membrane.
Preferably, the air purge pipeline is in the latticed lower section for being uniformly distributed in the MBR membrane modules.
There is better cleaning performance in latticed equally distributed air purge pipeline.
Preferably, it is provided with gas outlet on the air purge pipeline, the bubble that can be generated by gas outlet is shaken, and realizes more preferable
Cleaning.
The distribution of gas outlet is more uniform, and the cleaning bubble generated is to the cleaning performance of membrane module with regard to more preferable.
Preferably, the quantity of the gas outlet is multiple, the gas outlet Heterogeneous Permutation arrangement.
Preferably, the gas outlet interval 100mm Heterogeneous Permutations arrangement.
Preferably, the drainage pipeline is set to the both sides of MBR membrane modules.
Preferably, it is provided with the second valve on the drainage pipeline.
Under normal circumstances, the water yield of drainage pipeline is can control by valve, also can backwash when regulating agent use
Amount.It the case where for multigroup membrane module, can be by the backwashing pump of independent valve and connection on adjusting drainage pipeline, preferentially
The membrane module high to pollution level realizes that online backwashing, other membrane modules remain operational water outlet, continuous uninterrupted to reach
Ground runs the purpose of reaction unit, improves sewage treating efficiency, and be not required to separately set Membrane cleaning pond, reduces manual operation, drops
Low operating cost.
Preferably, it is provided with sample tap on the drainage pipeline.
Being provided with for sample tap goes out aqueous condition conducive to monitoring membrane module；And be conducive to find the damaged feelings of membrane module in time
Condition.
Preferably, it is connected by detachable apparatus between the top and MBR membrane modules of the reaction unit ontology.
Tower top can be opened by dismantling the detachable apparatus, replacement MBR membrane modules easy to repair and other components.
Preferably, it is provided with pressure sensor at the top of the reaction unit ontology, is provided on the pressure relief device
Three valves.
The pressure inside reaction unit can be monitored in real time by pressure sensor, and is let out by the control of third valve
The opening and closing of pressure device, and then ensure that reaction unit internal control within the scope of certain pressure, makes reaction unit be in high pressure conditions.
Compared with conventional aeration method, there are relatively high dissolved oxygen levels in the device, improves the speed of oxidation operation decomposition, from
And treatment effeciency is improved, reduce processing cost.In addition, when pressure is higher by certain value, valve is opened in time and is exhausted
Decompression, it is ensured that the normal operation of reaction unit.
Preferably, first, second, and third valve is electrically operated valve.
Preferably, the filler is suspending carrier, it is further preferable that the filler is polypropylene filler.
When selecting suspending carrier as filler, it is not necessary that filler support is arranged in the ponds MBBR, the aeration of filler and bottom is filled
It sets easy to maintain.In addition, polypropylene filler is polyhedron empty ball, inside there are 24 ball clack fins, the structure to be conducive to microorganism
Apposition growth, porosity is also larger, and density is slightly less than water, is suspended in water after biofilm, when reactor is aerated or is stirred, filler
It is in water fluidized state, has many advantages, such as good water, venting capability excessively, be not susceptible to block.
Preferably, the bottom of the reaction unit ontology is additionally provided with tripod, and top is provided with lifting lug.
Compared with prior art, the utility model has the advantages that：
The utility model, by reaction tank, the ponds MBBR and the ponds MBR being combined into one reaction system, is had using tower structure
More preferably, effluent quality is more excellent for wastewater treatment efficiency, and floor space is small, the construction period is short, high degree of automation, can realize continuous fortune
Row, the advantages such as construction cost is low.Meanwhile MBR membrane modules disposed in parallel have been selected, gas-washing device and membrane module can be greatly improved
Contact area, effectively reduce the pollution problem of membrane module.
Description of the drawings
Fig. 1 is the principal section structural schematic diagram for the up-flow biological reaction apparatus that embodiment 1 provides；
Fig. 2 is the main side cross-sectional view for the up-flow biological reaction apparatus that embodiment 1 provides；
Fig. 3 is the air purge piping diagram that embodiment 1 provides.
Wherein：
1 is reaction unit ontology, and 101 be evacuation port, and 102 be pressure relief device, and 103 be detachable apparatus, and 104 be pressure
Sensor, 105 be third valve, and 106 be tripod, and 107 be lifting lug；
2 be reaction tank, and 201 be water distributor, and 202 be three phase separator, and 203 be discharge duct；
3 be the ponds MBBR, and 301 be the first aerator, and 302 be filler, and 303 be filter plate, and 304 be the ponds MBBR reflux line,
305 pump for the first sewage backflow；
4 be the ponds MBR, and 401 be the second aerator, and 402 be MBR membrane modules, and 403 be drainage pipeline, and 404 return for the ponds MBR
Flow tube road, 405 pump for the second sewage backflow, and 406 be the first valve, and 407 be air purge pipeline, and 408 be gas outlet, and 409 be second
Valve, 410 be sample tap.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with Figure of description
And specific embodiment, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only
To explain the utility model, it is not used to limit the utility model.In addition, each implementation of the utility model disclosed below
Involved technical characteristic can be combined with each other as long as they do not conflict with each other in mode.
It should be noted that when original paper is referred to as " being set to ", " install in " another element, it both can be directly another
On element, there may also be original papers placed in the middle.When an element is considered " to connect " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.
Embodiment 1
As shown in Fig. 1 ~ 3, a kind of efficient up-flow biological reaction apparatus, including reaction unit ontology 1, reaction unit sheet
It is disposed with anaerobic pond 2, the ponds MBBR 3 and the ponds MBR 4 from the bottom to top in vivo.
The bottom of reaction unit ontology 1 is provided with evacuation port 101 and tripod 106, and top is provided with band third electrically operated valve
105 pressure relief device 102, pressure sensor 104 and lifting lug 107.
The bottom of anaerobic pond 2 is provided with water distributor 201, and top is provided with three phase separator 202, vertical on three phase separator
It is provided with discharge duct 203, discharge duct 203 runs through the top of reaction unit ontology 1.
The ponds MBBR 3 include that the first aerator 301 of bottom setting, the polypropylene filler 302 of internal setting and top are set
The filter plate 303 in the separation ponds MBBR and the ponds MBR set, the ponds MBBR 3 are connected by the ponds MBBR reflux line 304 with anaerobic pond 2
It is logical, the first sewage backflow pump 305 is provided on the ponds MBBR reflux line 304.
The ponds MBR 4 include the second aerator 401 for being set to bottom, three groups of MBR membrane modules for being parallel to 4 bottom of the ponds MBR
402 and the drainage pipeline 403 that is set to both sides and is individually connected with every group of MBR membrane module 402, it is arranged on drainage pipeline 403
There are the second electrically operated valve 409 and sample tap 410, the ponds MBR 4 to be connected to the ponds MBBR 3 by the ponds MBR reflux line 404, the ponds MBR are returned
The second sewage backflow pump 405 is provided on flow tube road 404.The lower section of MBR membrane modules 402 be provided be uniformly distributed in latticed and
Air purge pipeline 407 with the first electrically operated valve 406 is provided with gas outlet 408 on air purge pipeline 407, and the quantity of gas outlet 408 is
Multiple, gas outlet 408 is spaced 100mm Heterogeneous Permutations arrangement.
It is connected by the detachable apparatus 103 of bolt arrangement between the top and MBR membrane modules 402 of reaction unit ontology 1.
The utility model uses tower structure by anaerobic pond, the ponds MBBR and the ponds MBR being combined into one reaction system.Entirely
Sewage disposal process is：Sewage is introduced into from water distributor in reaction unit, through anaerobism（It lacks）After the processing of pond, pass through three phase separator reality
The separation of existing sludge, exhaust gas and waste water；Sludge, which can transport, to be continuing with into anaerobic pond as activated sludge；Exhaust gas can pass through row
Feed channel drains into the exhaust-gas treatment center outside reaction unit；Waste water then rises into and carries out Air Exposure in the ponds MBBR, removal
While organic pollution by mineralized nitrogen be nitrate nitrogen；Treated, and foul water fraction can be back to by reflux line detests（It lacks）
Oxygen pond carries out denitrification reaction, and the filtration that remaining sewage can pass upward through filter plate enters the ponds MBR；By the further of the ponds MBR
After processing, a part of sewage can be back to the ponds MBBR by reflux line, and the reaction was continued, and a part of sewage can be in MBR membrane modules
It is discharged under centrifugation, reaches reuse standard.
Individually cleaning is carried out to membrane module disposed in parallel by air purge pipeline and gas outlet, effectively reduces fouling membrane.Together
When can be by adjusting the backwashing pump of independent valve and connection on drainage pipeline, preferentially the membrane module high to pollution level, which is realized, exist
Line backwashes, other membrane modules remain operational water outlet, to achieve the purpose that uninterruptedly to run reaction unit；The present invention
In the frequency of membrane module in-site chemical cleaning be far below other MBR techniques, one is only and needs in-site chemical cleaning 10 ~ 30 times, and
Without cleaning offline；The service life of membrane module may be up to 5 years or more, greatly reduce cost.
The setting replacement MBR membrane modules easy to repair of detachable apparatus and other accessories；Pressure sensor and third valve
With the use of reaction unit can be made be in the normal operation of high pressure, with relatively high dissolved oxygen levels in device, carry
The speed that high oxidation operation decomposes reduces processing cost to improve treatment effeciency.
More preferably, effluent quality is more excellent for up-flow biological reaction apparatus wastewater treatment efficiency provided by the utility model, takes up an area
Area is small, and fouling membrane is small.Its treatment effect is as follows：
Sewage used is derived from Guangzhou city domestic sewage treatment plant, and influent quality is as shown in table 1.
Table 1 tests influent quality
Experiment condition：The residence time in anaerobic pond and the ponds MBBR is respectively 2.4h and 5h, and the ponds MBBR filler uses polypropylene
Filler, packing dosing rate 20%；Mixed liquid recycle ratio is 340%, and reaction temperature is room temperature, the matter in the ponds MBBR and DO in the ponds MBR
Measure a concentration of 1.5 ~ 3.0mg/L.
The experimental results showed that：After system run all right, effluent COD concentration 35.2mg/L,A concentration of 3.9mg/
A concentration of 13.8mg/L of L, TN, reaches《Urban wastewater treatment firm pollutant emission standard》（GB18918-2002）Level-one A discharges
Standard.
Embodiment 2
The present embodiment 2 provides a kind of efficient up-flow biological reaction apparatus, as shown in Fig. 1 ~ 3, except reaction tank is scarce
Outside oxygen pond, remaining part is consistent with embodiment 1 with connection relation.
Reaction unit provided in this embodiment is selected to handle sewage, treatment effect is as follows：
Sewage used is derived from Guangzhou industrial wastewater, and influent quality is as shown in table 2
Table 2 tests influent quality
Experiment condition：The residence time in anoxic pond and the ponds MBBR is respectively 6h and 18h, and the ponds MBBR filler uses reclaimed polypropylene
Material, packing dosing rate 30%；Mixed liquid recycle ratio is 250%, and reaction temperature is room temperature, the quality in the ponds MBBR and DO in the ponds MBR
A concentration of 3.5 ~ 4.5mg/L.
The experimental results showed that：After system run all right, effluent COD concentration 89mg/L,A concentration of 12mg/L, reaches
It arrives《Integrated wastewater discharge standard》（GB8978-1996）Primary standard.
Claims (10)
1. a kind of efficient up-flow biological reaction apparatus, which is characterized in that the biological reaction apparatus includes reaction unit sheet
Body (1), the reaction unit ontology (1) is interior to be disposed with reaction tank (2), the ponds MBBR (3) and the ponds MBR (4) from the bottom to top；Institute
The bottom and top for stating reaction unit ontology (1) are respectively arranged with evacuation port (101) and pressure relief device (102)；The reaction tank
(2) bottom and top are respectively arranged with water distributor (201) and three phase separator (202), are set on the three phase separator (202)
It is equipped with discharge duct (203)；Bottom, inside and the top of the ponds MBBR (3) be respectively arranged with the first aerator (301),
Filler (302) and filter plate (303), the ponds MBBR (3) are connected by the ponds MBBR reflux line (304) with reaction tank (2), institute
It states and is provided with the first sewage backflow pump (305) on the ponds MBBR reflux line (304)；The ponds MBR (4) include being set to bottom
Second aerator (401) and the MBR membrane modules (402) for being parallel to second aerator (401), the MBR membrane modules
(402) drainage pipeline (403) is provided on, the ponds MBR (4) are connected by the ponds MBR reflux line (404) with the ponds MBBR (3)
It is logical, the second sewage backflow pump (405) is provided on the ponds MBR reflux line (404).
2. efficient up-flow biological reaction apparatus according to claim 1, which is characterized in that the reaction tank (2) is to detest
Oxygen pond or anoxic pond.
3. efficient up-flow biological reaction apparatus according to claim 1, which is characterized in that the discharge duct (203)
It is vertically arranged and runs through the top of the reaction unit ontology (1).
4. efficient up-flow biological reaction apparatus according to claim 1, which is characterized in that the MBR membrane modules (402)
Lower section be provided with the air purge pipeline (407) of the first valve of band (406).
5. efficient up-flow biological reaction apparatus according to claim 3, which is characterized in that the air purge pipeline (407)
In the latticed lower section for being uniformly distributed in the MBR membrane modules (402).
6. efficient up-flow biological reaction apparatus according to claim 1, which is characterized in that the air purge pipeline (407)
On be provided with gas outlet (408).
7. efficient up-flow biological reaction apparatus according to claim 6, which is characterized in that the gas outlet (408)
Quantity is multiple, gas outlet (408) the Heterogeneous Permutation arrangement.
8. efficient up-flow biological reaction apparatus according to claim 1, which is characterized in that the drainage pipeline (403)
On be provided with the second valve (409).
9. efficient up-flow biological reaction apparatus according to claim 1, which is characterized in that the reaction unit ontology
(1) it is connect by detachable apparatus (103) between top and MBR membrane modules (402).
10. efficient up-flow biological reaction apparatus according to claim 1, which is characterized in that the reaction unit ontology
(1) it is provided with pressure sensor (104) at the top of, third valve (105) is provided on the pressure relief device (102).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721842530.6U CN207903981U (en) | 2017-12-26 | 2017-12-26 | A kind of efficient up-flow biological reaction apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721842530.6U CN207903981U (en) | 2017-12-26 | 2017-12-26 | A kind of efficient up-flow biological reaction apparatus |
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| CN207903981U true CN207903981U (en) | 2018-09-25 |
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ID=63568948
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986435A (en) * | 2017-12-26 | 2018-05-04 | 广州市环境保护工程设计院有限公司 | A kind of efficient up-flow biological reaction apparatus and its operation method and application |
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2017
- 2017-12-26 CN CN201721842530.6U patent/CN207903981U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986435A (en) * | 2017-12-26 | 2018-05-04 | 广州市环境保护工程设计院有限公司 | A kind of efficient up-flow biological reaction apparatus and its operation method and application |
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Granted publication date: 20180925 Termination date: 20201226 |