CN103488117B - A kind of Sewage Plant water inlet toxicity early warning and monitoring device - Google Patents
A kind of Sewage Plant water inlet toxicity early warning and monitoring device Download PDFInfo
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- CN103488117B CN103488117B CN201310459172.0A CN201310459172A CN103488117B CN 103488117 B CN103488117 B CN 103488117B CN 201310459172 A CN201310459172 A CN 201310459172A CN 103488117 B CN103488117 B CN 103488117B
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- preaeration
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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
Abstract
The invention discloses a kind of Sewage Plant water inlet toxicity early warning and monitoring device.Including sewage feed system, mud feed system, preaeration complete, being thoroughly mixed early warning reactor, PLC system and carbon source bin, described sewage feed system is connected with preaeration complete by sewage pump, sludge pump respectively with mud feed system；Pump mixed liquor by peristaltic pump from preaeration complete, enter through disc type silica gel tube and be thoroughly mixed early warning reactor；Utilize and DO1The DO that sensor connects1Electrode and and DO2The DO that sensor connects2Preaeration complete and the DO value being thoroughly mixed in early warning reactor are monitored by electrode respectively.The present invention can monitor Sewage Plant water inlet toxicity, the true reflection water inlet toxicity profile to our factory's activated sludge in real time, and Operation and Maintenance is simple, with low cost, is suitable for and sewage treatment plant inflow toxicity on-line monitoring.
Description
Technical field
The present invention relates to sewage treatment area, especially contain the sewage of industrial wastewater, particularly a kind of on-line continuous prison
Survey the monitoring device of Sewage Plant water inlet toxicity.
Background technology
In current water technology technique, activated sludge process still simple with its handling process, operating cost is cheap, dimension
Protect the advantages such as facility and be widely used in each large, medium and small sewage treatment plant.Along with the quickening of China's industrial development step, industry
The increasing year by year of wastewater discharge, undressed industrial wastewater is incorporated to city domestic sewage and enters the situation of sewage treatment plant relatively
For generally, and wherein may contain substantial amounts of Ecotoxicology material, these toxicants can inhibitory activity sludge microbe
Normal metabolic processes, causes sewage disposal process unstable, the situation that effluent quality is the most up to standard, in some instances it may even be possible to cause whole activity
Sludge system collapses, and then may carry out the cultivation work of time and effort consuming, bring greatly to the daily operation and management of Sewage Plant
Inconvenience.Therefore, it is extremely important that the research and development of municipal wastewater treatment plant water inlet Toxicity Monitoring equipment shows, and relies on water inlet Toxicity Monitoring
Equipment can understand rapidly water inlet toxicity profile, and corresponding counter-measure is taked in the water inlet for different toxic degrees, maximum
Degree alleviates the toxicant inhibitory action to active sludge microorganism, it is ensured that water outlet continuous-stable qualified discharge.
The current technology investigating municipal wastewater treatment plant water inlet toxic action has ATP luminescence, enzyme level, Microtox, Hatox-
1800 methods for toxicity monitoring such as grade, but, these methods are based on molecular biology test, the luminescence of photobacteria and bio electricity rheology
The principles such as change, its test object and test condition are entirely different with actual sewage treatment plant activated Sludge System, and test result is not
Can truly reflect the suppressed situation of Microbial Communities in Activated Sludge；Curent change degree and the toxicant suppression journey to microorganism
Degree linear dependence is the highest, and representativeness is not strong, can not carry out on-line continuous monitoring equally.
The oxygen consumption that breathing rate (Oxygen Uptake rate) is that active sludge microorganism is aerobic when utilizing Organic substance
Speed, is the theory index characterizing active sludge microorganism activity, i.e. the situation of change of activated sludge OUR just can react microorganism
Suppressed property degree, and then can be determined that in water, whether contain active sludge microorganism toxicant and toxic degree.At this
On one basis, the saprobia Toxicity Monitoring equipment of exploitation is less, and the equipment developed exists system complex, monitors continuously
The problems such as the systematic error between instability, maintenance requirement dissolved oxygen electrode equipment high, double.
Summary of the invention
It is an object of the invention to provide one stablize effective device to Sewage Plant water inlet toxicity be monitored, this monitoring
Device is with OUR as principle, and using DO suppression ratio is that Sewage Plant water inlet toxicity is monitored by index in real time.
The present invention is achieved in that Sewage Plant water inlet toxicity prior-warning device includes that the supply of sewage feed system, mud is
System, preaeration complete, it is thoroughly mixed early warning reactor, PLC system and carbon source bin, described sewage supply system
System is connected with preaeration complete by sewage pump, sludge pump respectively with mud feed system；By peristaltic pump from
Preaeration complete pumping mixed liquor, enters through disc type silica gel tube and is thoroughly mixed early warning reactor；Utilize and DO1
The DO that sensor connects1Electrode and and DO2The DO that sensor connects2Electrode is respectively to preaeration complete and completely
DO value in mixing early warning reactor is monitored；DO1Sensor and DO2Sensor is connected with PLC system, the data to monitoring
It is acquired and judges；Carbon source bin quantitatively injects sodium acetate by pipeline in preaeration complete, maintains
A certain amount of COD content.
It is equipped with the first magnetic stir bar bottom preaeration complete, controls rotating speed by magnetic stirring apparatus, expose
Mechanism of qi connects aeration head by aeration tube provides the dissolved oxygen of abundance for the mixed liquor in preaeration complete.
Carbon source bin stores certain density sodium acetate solution, is quantitatively added in preaeration by pipeline the most mixed
Close in reactor.
Disc type silica gel tube two ends are connected with preaeration complete respectively and are thoroughly mixed early warning reactor, and pass through
Peristaltic pump makes mixed liquor flow continuously；Utilize DO1Electrode and DO2Electrode is respectively to preaeration complete and the most mixed
The DO value closed in early warning reactor is monitored.
It is thoroughly mixed early warning reactor wall surface and is equipped with turbulent baffle, make mixed liquor make in the second magnetic stir bar stirring
More uniform with lower mixing, it is to avoid to occur that recycle stream, top are equipped with capping to be thoroughly mixed early warning reactor local environment close
Close, it is to avoid the outside air interference to monitoring.
The step utilizing this Sewage Plant water inlet toxicity prior-warning device to be monitored sewage is:
(1) by mud discharge Q1With discharge of sewage Q2Control as Q1: Q2=1-2:3, makes entrance preaeration be thoroughly mixed reaction
The mixed liquor of device is 1000mg/L containing MLSS, opens aerator, and regulate tolerance and make in preaeration complete
DO value be 5.5-6.0mg/L, control mixed liquor hydraulic detention time (HRT) be 1～3min, ensured by magnetic stirring apparatus
Sewage is fully contacted reaction with mud.
(2) sewage is replaced as placing the clear water of more than 2 hours under step (1) equal conditions, uses DO simultaneously2Electrode
The DO value being thoroughly mixed in early warning reactor is detected and record, calculates DO0=DOq-DOw(DO0Consume for mixed liquor
Dissolved oxygen, DOqThe DO value monitored during for being passed through clear water, DOwThe DO value monitored during for being passed through sewage).
(3) use peristaltic pump that mixed liquor is pumped into be thoroughly mixed in early warning reactor by disc type silica gel tube 22, and control
Its HRT is 2min；Controlling carbon source bin makes the amount of sodium acetate in preaeration complete that is added to be 100 mg/L
COD；
(4) DO is utilized1The DO that sensor connects1Mixed liquor in preaeration complete is carried out continuously by electrode
Monitoring, controlling DO is 5.5-6.0 mg/L；Utilize DO2The DO that sensor connects2DO in complete is carried out by electrode
Monitoring continuously, and by PLC system, the data gathered are calculated and analyze.
(5) PLC system is to DO2The data of Sensor monitoring calculate and analyze, the formula according to being previously implanted: DOY%=
(DO2-DO1)/DO0* 100 calculate DOY%(DO0Amount, DO for system consumption dissolved oxygen1For dissolved oxygen water before toxicant impact
Flat, DO2For toxicant impact after dissolved oxygen levels), and with default DO suppression ratio DOY1 、DOY2 、DOY3Relatively:
Work as DOY≤DOY1, not report to the police, display lamp is green, shows in water without mud toxicant.
Work as DOY1<DOY≤DOY2, to report to the police, display lamp is orange, shows that toxicity is less containing mud toxicant in water, needs
Pay general attention.
Work as DOY2<DOY≤DOY3, report to the police, display lamp yellow, show containing mud toxicant in water, toxicity is relatively big, needs
Take appropriate measures.
Work as DOY≥DOY3, to report to the police, display lamp is red, shows containing mud toxicant in water, and toxicity is very big, needs to adopt
Take the emergency plan that Sewage Plant is hit.
In step (2), control the mixed liquor DO value in preaeration complete be 5.5-6.0mg/L, HRT be 1-
3min (need be thoroughly mixed early warning reactor mate).
In step (3), a diameter of 10mm of disc type silica gel tube, a length of 2.8m, coil in the shape of a spiral in organic cylinder body surface
Face；It is thoroughly mixed early warning reactor wall surface and is equipped with turbulent baffle, make mixed liquor under the second magnetic stir bar stirring action
Mix more uniform, it is to avoid occur that recycle stream, top are equipped with capping so that be thoroughly mixed early warning reactor local environment airtight,
Avoid the outside air interference to monitoring.
In step (5), the DO presetY% is respectively, DOY1 =10%、DOY2 =30%、DOY3 =50%。
Compared with prior art, advantages of the present invention is:
(1) Real-time Collection biochemistry pool mud is intake with setting pot, and monitoring result is representative strong；(2) mud shifts to an earlier date with sewage
It is fully contacted, increases time of contact, react more complete；(3) increase the preaeration stage, reduce what system was produced by water inlet dissolved oxygen
Impact；(4) use single dissolved oxygen electrode, reduce interelectrode systematic error；(5) carbon source replenishment system is increased, it is to avoid because entering
Water carbon source deficiency causes the toxicity inaccurate situation of early warning and monitoring result.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention Sewage Plant water inlet toxicity prior-warning device structural representation.
Labelling in figure: 1-sewage feed system；2-mud feed system；3-sewage pump；4-sludge pump；5-preaeration is complete
Mixing reactor；6,21-magnetic stirring apparatus；7-aeration head；8-the first magnetic stir bar；9-aerator；10-DO1Sensor；
11-DO1Electrode；12-PLC system；13-DO2Sensor；14-DO2Electrode；15-covers；16-overfall；17-turbulent baffle；
18-is thoroughly mixed early warning reactor；19-the second magnetic stir bar；20-peristaltic pump；22-disc type silica gel tube；23-carbon source stores
Device.
Real-time monitoring result figure during Cu (II) bombardment by ions when Fig. 2 is embodiment of the present invention Cu=5 mg/L.
Real-time monitoring result figure during Cu (II) bombardment by ions when Fig. 3 is embodiment of the present invention Cu=10 mg/L.
Real-time monitoring result figure when Fig. 4 is the mg/L phenol impact of embodiment of the present invention phenol=10.
Real-time monitoring result figure when Fig. 5 is the mg/L phenol impact of embodiment of the present invention phenol=20.
Detailed description of the invention
Embodiment:
As it is shown in figure 1, Sewage Plant water inlet toxicity prior-warning device includes sewage feed system 1, mud feed system 2, pre-exposure
Gas complete 5, it is thoroughly mixed early warning reactor 18, PLC system 12 and carbon source bin 22, described sewage supply system
System 1 is connected with preaeration complete 5 by sewage pump 3, sludge pump 4 respectively with mud feed system 2；By wriggling
Pump 20 pumps mixed liquor from preaeration complete 5, enters through disc type silica gel tube 22 and is thoroughly mixed early warning reactor
18；Utilize and DO1The DO that sensor 10 connects1Electrode 11 and and DO2The DO that sensor 13 connects2Electrode 14 is respectively to preaeration
Complete 5 and the DO value being thoroughly mixed in early warning reactor 18 are monitored；DO1Sensor 10 and DO2Sensor 13
It is connected with PLC system 12, the data of monitoring are acquired and judge；Carbon source bin 23 is the most mixed to preaeration by pipeline
Close in reactor 5 and quantitatively inject sodium acetate, maintain a certain amount of COD content.
It is equipped with the first magnetic stir bar 8 bottom preaeration complete 5, controls rotating speed by magnetic stirring apparatus 6,
Aerator 9 connects aeration head 7 by aeration tube provides the dissolving of abundance for the mixed liquor in preaeration complete 5
Oxygen.
Carbon source bin 23 stores certain density sodium acetate solution, is quantitatively added in preaeration by pipeline complete
In mixing reactor 5.
Disc type silica gel tube 22 two ends are connected with preaeration complete 5 respectively and are thoroughly mixed early warning reactor 18,
And make mixed liquor flow continuously by peristaltic pump 20, utilize DO1Electrode 11 and DO2Preaeration is thoroughly mixed instead by electrode 14 respectively
Device 5 and the DO value being thoroughly mixed in early warning reactor 18 is answered to be monitored.
It is thoroughly mixed early warning reactor 18 inner wall surface and is equipped with turbulent baffle 17, make mixed liquor in the second magnetic stir bar 19
Mix more uniform under stirring action, it is to avoid occur that recycle stream, top are equipped with capping 15 so that be thoroughly mixed early warning reactor 18
Local environment is airtight, it is to avoid the outside air interference to monitoring.
The step utilizing this Sewage Plant water inlet toxicity prior-warning device to be monitored sewage is:
(1) by mud discharge Q1With discharge of sewage Q2Control as Q1: Q2=1:3, makes entrance preaeration be thoroughly mixed reaction
The mixed liquor of device 5 is 1000mg/L containing sludge concentration (MLSS), opens aerator 9, and regulate tolerance and make preaeration complete
DO value in mixing reactor 5 is 5.8mg/L, and the hydraulic detention time (HRT) controlling mixed liquor is 1min, passes through magnetic agitation
What device 6 ensured sewage and mud is fully contacted reaction.
(2) under previous step equal conditions, sewage is replaced as placing the clear water of more than 2 hours, uses DO simultaneously2Electrode
The DO value that 14 pairs are thoroughly mixed in early warning reactor 18 detects and record, calculates DO0=DOq-DOw(DO0Disappear for mixed liquor
The dissolved oxygen of consumption, DOqThe DO value monitored during for being passed through clear water, DOwThe DO value monitored during for being passed through sewage).
(3) use 20 mixed liquors of peristaltic pump to be pumped into by disc type silica gel tube 22 to be thoroughly mixed in early warning reactor 18, and
Controlling its HRT is 2min；Control carbon source bin 23 making it add the amount of sodium acetate is 100 mg/L COD；
(4) DO is utilized1The DO that sensor 10 connects1Mixed liquor in preaeration complete 5 is entered by electrode 11
Row monitoring continuously, controlling DO is 5.8 mg/L；Utilize DO2The DO that sensor 13 connects2Electrode 14 is to being thoroughly mixed early warning reaction
DO in device 18 is continuously monitored, and by PLC system 12, the data gathered is calculated and analyzed；DO2During value sampling
Between be spaced apart 30s.
(5) PLC system 12 is to DO2The data of sensor 13 monitoring calculate and analyze, according to the public affairs being previously implanted
Formula: DOY%=(DO2-DO1)/DO0* 100 calculate DOY%(DO0Amount, DO for system consumption dissolved oxygen1Before impacting for toxicant
Dissolved oxygen levels, DO2For toxicant impact after dissolved oxygen levels), and with default DO suppression ratio DOY1、DOY2、DOY3Relatively,
DO in the present embodimentY% is respectively, DOY1 =10%、DOY2 =30%、DOY3=50%:
Work as DOY≤ 10%, not report to the police, display lamp is green, shows in water without mud toxicant.
As 10% < DOY≤ 30%, to report to the police, display lamp is orange, shows that toxicity is less containing mud toxicant in water, needs
Pay general attention.
As 30% < DOY≤ 50%, report to the police, display lamp yellow, show containing mud toxicant in water, toxicity is relatively big, needs
Take appropriate measures.
Work as DOY>=50%, to report to the police, display lamp is red, shows containing mud toxicant in water, and toxicity is very big, needs to adopt
Take the emergency plan that Sewage Plant is hit.
Fig. 2,3 be system in the case of variable concentrations gradient Cu (II) bombardment by ions (5mg/L, 10mg/L), suppression ratio feelings
The real-time monitoring result of condition.
Concrete grammar: first determine DO according to implementing step0, it is subsequently passed sewage, early warning reactor 18 to be thoroughly mixed
After producing stable DO baseline, be passed through the simulation sewage containing a certain amount of Cu (II) ion, until DO rise to high level steadily after, again
Being passed through normal sewage, the DO peak value of generation is suppressed institute for being thoroughly mixed sludge microbe in early warning reactor 18 by Cu (II) ion
The dissolved oxygen discharged, passes through formula: DOY%=(DO2-DO1)/DO0* 100, calculate suppression ratio, characterize mud with this suppressed
Situation, the experiment HRT being thoroughly mixed early warning reactor 18 takes 2min.
Fig. 4,5 be system under variable concentrations gradient phenol impact condition (10mg/L, 20mg/L), the reality of suppression ratio situation
Time monitoring result.
Concrete grammar and Cu (II) are from identical.
Claims (1)
1. a Sewage Plant water inlet toxicity early-warning monitoring method, detects with Sewage Plant water inlet toxicity prior-warning device, Sewage Plant
Water inlet toxicity prior-warning device include sewage feed system (1), mud feed system (2), preaeration complete (5),
It is thoroughly mixed early warning reactor (18), PLC system (12) and carbon source bin (23), described sewage feed system (1) and mud
Feed system (2) is connected with preaeration complete (5) by sewage pump (3), sludge pump (4) respectively；By wriggling
Pump (20) pumps mixed liquor from preaeration complete (5), enters through disc type silica gel tube (22) and is thoroughly mixed early warning
Reactor (18)；Utilize and DO1The DO that sensor (10) connects1Electrode (11) and and DO2The DO that sensor (13) connects2Electrode
(14) respectively preaeration complete (5) and the DO value being thoroughly mixed in early warning reactor (18) are monitored；DO1
Sensor (10) and DO2Sensor (13) is connected with PLC system (12), and the data of monitoring are acquired and are judged；Carbon source is stored up
Storage (23) quantitatively injects sodium acetate by pipeline in preaeration complete (5), maintains a certain amount of COD to contain
Amount；Preaeration complete (5) bottom is equipped with the first magnetic stir bar (8), controls to turn by magnetic stirring apparatus (6)
Speed, it is that the mixed liquor offer in preaeration complete (5) is filled that aerator (9) connects aeration head (7) by aeration tube
The dissolved oxygen of foot；Carbon source bin stores certain density sodium acetate solution in (23), is quantitatively added in pre-exposure by pipeline
In gas complete (5)；Disc type silica gel tube (22) two ends are connected with preaeration complete (5) and completely respectively
Mixing early warning reactor (18), and make mixed liquor flow continuously by peristaltic pump (20)；Utilize DO1Electrode (11) and DO2Electrode
(14) respectively preaeration complete (5) and the DO value being thoroughly mixed in early warning reactor (18) are monitored；Complete
Full mixing early warning reactor (18) inner wall surface is equipped with turbulent baffle (17), makes mixed liquor stir in the second magnetic stir bar (19)
The lower mixing of effect is more uniform, it is to avoid occur that recycle stream, top are equipped with capping (15) so that be thoroughly mixed early warning reactor (18)
Local environment is airtight, it is to avoid the outside air interference to monitoring, it is characterised in that with Sewage Plant water inlet toxicity early warning and monitoring device
The step being monitored sewage is:
Step one, by mud discharge Q1With discharge of sewage Q2Control as Q1: Q2=1:3, makes entrance preaeration complete
Mixed liquor in be 1000mg/L containing sludge concentration, open aerator, and regulate tolerance and make preaeration complete
In DO value be 5.8mg/L, control mixed liquor hydraulic detention time be 1min；
Step 2, is replaced as placing the clear water of more than 2 hours sewage under the conditions of step one is equal, uses DO simultaneously2Electrode pair
The DO value being thoroughly mixed in early warning reactor carries out detecting and record, calculates DO0=DOq-DOw, DO0For mixed liquor consume molten
Solve oxygen, DOqThe DO value monitored during for being passed through clear water, DOwThe DO value monitored during for being passed through sewage；
Step 3, uses peristaltic pump that mixed liquor is pumped into by disc type silica gel tube and is thoroughly mixed in early warning reactor, and control water
The power time of staying is 2min；Control carbon source bin making it add the amount of sodium acetate is 100 mg/L COD；
Step 4, utilizes DO1The DO that sensor connects1Mixed liquor in preaeration complete is carried out continuously by electrode
Monitoring, controlling DO is 5.8 mg/L；Utilize DO2The DO that sensor connects2The electrode DO to being thoroughly mixed in early warning reactor is carried out
Monitoring continuously, and by PLC system, the data gathered are calculated and analyze；DO2Value sample interval is 30s；
Step 5, PLC system is to DO2The data of Sensor monitoring calculate and analyze, the formula according to being previously implanted: DOY%
=(DO2-DO1)/DO0* 100 calculate DOY%, DO0Amount, DO for system consumption dissolved oxygen1For dissolved oxygen before toxicant impact
Level, DO2For toxicant impact after dissolved oxygen levels, and with default DO suppression ratio DOY1、DOY2、DOY3Relatively, wherein DOY%
It is respectively, DOY1 =10%、DOY2 =30%、DOY3 =50%。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310459172.0A CN103488117B (en) | 2013-10-02 | 2013-10-02 | A kind of Sewage Plant water inlet toxicity early warning and monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310459172.0A CN103488117B (en) | 2013-10-02 | 2013-10-02 | A kind of Sewage Plant water inlet toxicity early warning and monitoring device |
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| Publication Number | Publication Date |
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| CN103488117A CN103488117A (en) | 2014-01-01 |
| CN103488117B true CN103488117B (en) | 2016-08-10 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105004847A (en) * | 2015-07-13 | 2015-10-28 | 中科宇图天下科技有限公司 | Microbe breathing oxygen consumption monitoring-based water toxicity on-line early-warning device and method |
| CN110186970A (en) * | 2019-07-10 | 2019-08-30 | 廊坊市慧璟科技有限公司 | A kind of sewage treatment plant inflow toxicity on-line measuring device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040177664A1 (en) * | 2003-03-13 | 2004-09-16 | Roland Hale | Production of a high quality organic-based fertilizer |
| GB0518508D0 (en) * | 2005-09-10 | 2005-10-19 | Christian Stuart J | Treatment of waste |
| CN101907596B (en) * | 2010-08-30 | 2013-01-02 | 重庆大学 | Method for monitoring and estimating inlet water toxicity of urban wastewater treatment plant on line |
| CN102520016B (en) * | 2011-11-25 | 2013-06-12 | 清华大学 | System and method for monitoring municipal saprobia inhibitive ability in real time based on oxygen uptake rate (OUR) |
| CN103018415B (en) * | 2012-10-30 | 2015-08-26 | 广州市市政工程设计研究院 | Sewage Plant toxic wastewater on-line measuring device and detection method |
| CN102980983B (en) * | 2012-11-28 | 2016-06-15 | 广州中国科学院沈阳自动化研究所分所 | A kind of saprobia toxicity on-line monitoring analyser and monitoring system |
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Effective date of registration: 20170907 Address after: 535400, Jiangbei Road, Ling Town, Lingshan County, Qinzhou, the Guangxi Zhuang Autonomous Region Patentee after: Lingshan city sewage treatment plant Address before: 541004 the Guangxi Zhuang Autonomous Region Guilin Construction Road No. 12 Patentee before: Guilin University of Technology |
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Granted publication date: 20160810 Termination date: 20181002 |