CN208700677U - A kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting - Google Patents
A kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting Download PDFInfo
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- CN208700677U CN208700677U CN201820809232.5U CN201820809232U CN208700677U CN 208700677 U CN208700677 U CN 208700677U CN 201820809232 U CN201820809232 U CN 201820809232U CN 208700677 U CN208700677 U CN 208700677U
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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 utility model discloses a kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting.This device includes sbr reactor device；Aerator, DO sensor, agitating device and pH sensor are equipped in sbr reactor device；Sbr reactor device is connected with intake pump and water outlet pump respectively by pipeline；The bottom of sbr reactor device is equipped with sludge pipe.Utility model device can advantageously promote the growth of AOB, inhibit nitration reaction, and the energy consumption of reaction unit can be effectively reduced, and shorten short distance nitration starting period etc., it can be achieved that the quick start of the short distance nitration to the sanitary sewage of low ammonia-nitrogen content.
Description
Technical field
The utility model relates to a kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting.
Background technique
Since city domestic sewage water is big, C/N is than low, conventional activated sludge treatment process (A/O, oxidation ditch, A2/O work
Skill) there is the disadvantages of aeration energy consumption is high, and long processing period, sludge output are big and occupy a large amount of land areas.For traditional denitrogenation
Inherent defect existing for technique and current energy-saving requirement, have developed a series of new denitrification process sewage water denitrification
Novel process research, is concentrated mainly on short-cut nitrification-denitrification and short distance nitration-anaerobic ammoxidation technique.The anti-nitre of short distance nitration
Changing biological denitrification process has saving aeration energy consumption, shortens the reaction time, save denitrifying carbon source, reduce sludge creation amount, subtract
The advantages that few reactor dischargeable capacity and saving capital cost, and short distance nitration-anaerobic ammoxidation technique has without external carbon
Source, waste water, hydraulic detention time suitable for handling low C/N ratio are short, reactor volume is small, aeration energy consumption is low, process sludge yield
It is few, the energy consumption of sludge treating system can be substantially reduced.And how to fast implement short distance nitration then becomes new process advanced nitrogen
Premise.
Short distance nitration technology, also known as nitrite type bio-denitrification technology are to control nitrifying process in NO2- N the stage
And terminate, it eliminates in traditional biological denitrogenation by nitrite-oxidizing into nitrate, is then reduced into two links of nitrite.When
The preceding quick start for city domestic sewage short distance nitration mainly uses SBR technique, passes through control dissolved oxygen, temperature, pH etc.
Various boundary controls.Once common vetch etc. controlled temperature within the scope of 30~32 DEG C in two-stage SBR process, and operation 30d is realized
(Zeng Wei, Peng Yongzhen, Wang Shuying wait two-stage SBR removal organic matter and short-cut nitrification and denitrification [J] environment section to short distance nitration
It learns, 2002,23 (2): 50-54.)；Wu Chang is forever equal to use SBR process sanitary sewage, and temperature is (28 ± 0.5) DEG C, aeration
Amount is 0.3m3When/h, domestication 67d make nitrite accumulation rate stablize 80% or more (Wu Changyong, Chen Zhiqiang, Peng Yongzhen are real-time
Control realization and its stability study [J] the China water supply and drainage of lower short range biological denitrification, 2006,22 (19): 39-43.)；Peng
Attain forever etc. and to use SBR process NH4 +- N be 44.0~65.0mg/L sanitary sewage, pH be 7.9~8.0,25 DEG C of temperature,
After running 145d, system nitrite nitrogen accumulation rate reaches 90% or more.
CN105481087A discloses a kind of method of municipal sewage short distance nitration quick start, and this method is dirty by inoculation
Mud concentration maintains 4000~5000mg/L, and control temperature remains at 30-35 DEG C.Dissolved oxygen concentration in 0.5-0.6mg/L,
By to different NH4 +The sodium hydroxide of 0.5mol/L or the mode of 0.5mol/L hydrochloric acid solution adjusting pH is respectively adopted in-N concentration
Realize NO2 -The accumulation of-N.This method lacks specific operation control for the control model of the differential responses method of operation, and right
It is not also described in the control of the municipal sewage short distance nitration cycle of operation, moreover, for fairly large city domestic sewage
For, aeration quantity also lacks the operating parameter of system as an important factor for short distance nitration realization.Meanwhile by raw for city
The research of sewerage short-cut nitrification living, sodium hydroxide or hydrochloric acid solution adjust the mode of pH since pH amplitude of variation is larger and unfavorable
Growth and NO in AOB2 -The accumulation of-N.
CN103951057A discloses under a kind of room temperature low C/N and starts method, this method than series flow of sewage short distance nitration
By the way that AAO reactor is divided into aerobic section 1, aerobic section 2 and aerobic section 3, sludge concentration is 2.5-3g/L after inoculation in reactor,
At 23-25 DEG C of water temperature, under the conditions of ammonia nitrogen mass concentration is 80-92mg/L, control hydraulic detention time is 8.0-8.3h, aerobic zone
Dissolved oxygen concentration is 2-3mg/L, is first quickly eluriated nitrite oxidizing bacteria (NOB) with continuous flow short SRT, and ammoxidation is screened
Bacterium (AOB) then adds polypropylene column floating stuffing in aerobic zone, restores long sludge age, realizes that nitrosoation rate is stablized
80% or more, complete the starting of continuous flow short distance nitration.This method starts short distance nitration using continuous stream mode, and there are the cycles of operation
Longer and nitrogenous effluent concentration is higher, is not suitable for low ammonia nitrogen city domestic sewage, and operating process is relatively complicated,
It is unfavorable for actual production.
CN104556356A discloses a kind of method of quick start short distance nitration reactor, and this method uses up flow type gas
Reactor is risen, operating temperature is 30-37 DEG C, after being inoculated with to nitrator, carries out the excess aeration (duration 7 first
~30d), aeration impact is imposed, then impose the joint load impact including substrate concentration impact and hydraulic detention time impact and (hold
Continuous 3~15d of time), finally in the case where maintaining suitable substrate concentration and hydraulic detention time, inorganic carbon source concentration is improved, with richness
Collecting ammonia oxidation bacteria, accelerates the accumulation of nitrite, hydraulic detention time is 10~30h, initial 100~500mg/L of ammonia nitrogen concentration,
Water inlet pH value 8~9.5, this method use up flow type gas lift reactor, and it is dirty to be higher than conventional urban life for influent ammonium concentration
Water, and pH and temperature requirement are higher, are unfavorable for the universal and practical of method and go into operation.
Therefore, the temperature faced for conventional city domestic sewage is low, and water inlet substrate concentration is low, and treating capacity is big, and temperature is low
Heating energy consumption is high and slow status is tamed in ammonia oxidation bacteria culture, and how fast and stable realizes that low C/N is than waste water short distance nitration
Solve the key that the techniques such as short-cut nitrification and denitrification and short distance nitration-ANAMMOX are applied to city domestic sewage.
Currently employed SBR technique realize short range biological denitrification technology mainly use " water inlet → stirring → aeration → precipitating →
The operational mode of water outlet ", since the AOB influence for being highly prone to dissolved oxygen (DO) easily causes nitrite to be oxidized to nitric acid
Therefore salt is particularly important aeration quantity during process operation, the accuracy controlling for being aerated runing time.
Utility model content
The utility model is directed to routine SBR short-cut nitrification technology, proposes the easy-operating operation method of more accurate optimization,
And then a kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting is provided, solve the current low city C/N
There are ammonia oxidation bacteria (AOB) to be proliferated efficiency in sanitary sewage short-cut nitrification technology (the especially short distance nitration of low ammonia nitrogen waste water)
Slowly, nitrite accumulation low efficiency, short distance nitration starting the period it is long the problems such as.
Low C/N ratio described in the utility model refers in city domestic sewage always containing for the total content of carbon and nitrogen in organic matter
The ratio of amount.
Low ratio of carbon to ammonium city domestic sewage described in the utility model refers to the C/N of city domestic sewage 3~5.
Technical solution adopted in the utility model is:
A kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting, including sbr reactor device；SBR is anti-
It answers and is equipped with aerator, DO sensor, agitating device and pH sensor in device；Sbr reactor device by pipeline respectively with intake pump
It is connected with water outlet pump；The bottom of sbr reactor device is equipped with sludge pipe.
In device, aerator is connected by pipeline with gas flowmeter and blowing plant.
In device, DO sensor is connected with DO analyzer.
In device, pH sensor is connected with pH value analyzer.
In device, intake pump is connected by pipeline with raw water box.
In device, the side wall of sbr reactor device is equipped with several sample taps.
The beneficial effects of the utility model are:
Utility model device can advantageously promote the growth of AOB, inhibit nitration reaction, and reaction dress can be effectively reduced
The energy consumption set shortens short distance nitration starting period etc., it can be achieved that the quick of the short distance nitration of the sanitary sewage of low ammonia-nitrogen content
Starting.
It is specific as follows:
1) utility model device establishes more complete low C/N fast implementing than city domestic sewage short distance nitration
Method includes how the proliferation for carrying out ammonia oxidation bacteria (AOB), and realizes that nitrite maximizes the control condition of accumulation, leads to
It crosses pH regulative mode and efficiently solves that the strain proliferation that SBR technique occurs during short distance nitration is slow, ammonia nitrogen conversion efficiency
The problems such as low, lays a good foundation for engineering actual motion；
2) what utility model device was creative proposes pH impact load and aeration joint quick start short distance nitration excessively
Mode, realize the quick elutriation of ammonia oxidation bacteria in inoculation of activated-sludge (AOB), efficiently solve municipal sewage routine work
The starting of skill short distance nitration runs slow problem；
3) for traditional handicraft using the mode of the DO control aeration cycle of operation, utility model device passes through many experiments
Research, accurately optimizes aeration quantity as individual governing factor, easily occurs for nitrite in continuous aeration
The problem of nitration reaction, accomplishes accurate process control, can effectively control the aeration cycle of operation, reduces reaction unit and runs energy
Consumption；
4) utility model device is provided using SBR technique, the short distance of the city domestic sewage of C/N ratio low for room temperature
Nitrifying each governing factor fast implemented includes the setting of the design parameters such as aeration quantity, pH, continuous aeration runing time, in conjunction with
ANAMMOX and denitrification technology have innovative meaning to removal ammonia nitrogen；
5) utility model device is operated using whole-process automatic control module, and control is simply preferably gone, for engineering
Using with important reference value.
Detailed description of the invention
Fig. 1 is the schematic device of the utility model；
Fig. 2 is utility model device operation first stage NH4 +-N、NO2 --N、NO3- N concentration figure of changing；
Fig. 3 is utility model device operation second stage NH4 +-N、NO2 --N、NO3- N concentration figure of changing；
Fig. 4 is utility model device operation phase III NH4 +-N、NO2 --N、NO3- N concentration figure of changing；
Fig. 5 is utility model device operation fourth stage NH4 +-N、NO2 --N、NO3- N concentration figure of changing.
Specific embodiment
Attached drawing 1 is the schematic device of the utility model.In Fig. 1,1-SBR reactor；2- aerator；3-DO measurement
Instrument；4-DO sensor；5- agitating device；6-pH Meter；7-pH value sensor；8- sludge pipe；9- sample tap；10- compression
Air assembly；11- gas flowmeter；12- intake pump；13- water outlet pump.Below in conjunction with device of the Fig. 1 to the utility model make into
The explanation of one step.
A kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting, including sbr reactor device (1)；SBR
Aerator (2), DO sensor (4), agitating device (5) and pH sensor (7) are equipped in reactor (1)；Sbr reactor device (1)
It is connected respectively with intake pump (12) and water outlet pump (13) by pipeline；The bottom of sbr reactor device (1) is equipped with sludge pipe (8).
Further, in device, aerator (2) passes through pipeline and gas flowmeter (11) and blowing plant (10)
It is connected.
Further, in device, DO sensor (4) is connected with DO analyzer (3).
Further, in device, pH sensor (7) is connected with pH value analyzer (6).
Further, in device, intake pump (12) is connected by pipeline with raw water box；Raw water box fills pending low
Carbon-nitrogen ratio city domestic sewage.
Further, in device, the side wall of sbr reactor device (1) is equipped with several sample taps (9).
A kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration quick start method is using above-mentioned this room temperature
Low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting is handled, comprising the following steps:
1) be inoculated with: the seed sludge that will be enriched in nitrobacteria is added in sbr reactor device；
2) it intakes: low ratio of carbon to ammonium city domestic sewage to be processed being imported in sbr reactor device, sludge in reactor is made
Concentration MLSS is 2500mg/L~3500mg/L；
3) be aerated: the aerator in starting sbr reactor device makes the concentration of dissolved oxygen in reactor not less than 2mg/L；
4) it stands water outlet: stopping aeration, stand, make the muddy water mixed solution natural sedimentation in reactor, supernatant is discharged；
5) it reprocesses: being repeated 10 times~20 step 2~steps 4)；
6) pH impacts: importing low ratio of carbon to ammonium city domestic sewage to be processed again into sbr reactor device, and adjusts reactor
In aeration quantity be 1.5LGas/(LWaterH)~2.0LGas/(LWaterH), DO is lower than 0.5mg/L, and pH is 8~9；Control flooding time
For 0.2h~0.5h, aeration time is 3h~6h, and standing (precipitating) time is 0.5h~1h, and water discharging time is 0.2h~0.5h,
It is run；8~12 periods of continuous operation reactor.
Further, low ratio of carbon to ammonium city domestic sewage parameter to be processed is as follows: NH4 +- N=25mg/L~30mg/L；
CODr=100mg/L~150mg/L；BOD5=110mg/L~145mg/L.
Preferably, in step 3), aeration time is 8h~12h；It is further preferred that in step 3), aeration time is
10h。
Preferably, in step 4), the time for standing water outlet is 2h~3h；It is further preferred that standing water outlet in step 4)
Time be 2h.
Preferably, in step 6), adjust reagent used in pH be alkali carbonate, in alkali metal hydrogencarbonate at least
It is a kind of；It is further preferred that adjusting reagent used in pH is sodium bicarbonate, sodium carbonate, saleratus, potassium carbonate in step 6)
At least one of；Still further preferably, in step 6), adjusting reagent used in pH is sodium bicarbonate.
Preferably, in step 6), adjusting pH is 8.5.
Preferably, in step 6), 10 periods of continuous operation reactor.
Further, in step 6), during continuous operation reactor, aeration quantity and aeration time can be according to reactors
The cumulant of middle nitrite nitrogen gradually adjusts.
It is described in further detail below by way of content of the specific embodiment to the utility model.It is used in embodiment
Raw material unless otherwise specified, can be obtained from routine business approach.
Embodiment:
It is further described below with reference to Fig. 1.A kind of side of low C/N than city domestic sewage short distance nitration quick start
Method and device include: raw water box, the intake pump being connected with raw water box, and intake pump connects SBR life by water inlet pipe by timed unit
Change reactor, pond body is internally provided with stirring and aeration facility, and aeration and stirring facility are controlled by timed unit, pool bottom
Equipped with sludge pipe.
A kind of low C/N of room temperature than city domestic sewage short distance nitration quick start method the following steps are included:
1) be inoculated with: the seed sludge that will be enriched in nitrobacteria imports in SBR biochemical reactor, and seed sludge can be dirty for city
Water factory's secondary settling tank returned sludge；Seed sludge is derived from certain municipal sewage plant's secondary settling tank returned sludge, wherein thin rich in nitrification
Bacterium.
2) intake: treatment sewage imported in sbr reactor device, make the concentration MLSS 2500 of sludge in reactor~
3500mg/L；Raw sewage water quality is NH4 +- N=25~30mg/L, CODr=100~150mg/L, BOD5=110~145mg/L；
3) be aerated: the aeration facility in starting sbr reactor device makes reactor be constantly in aerobic environment, wherein dissolved oxygen
Concentration is not less than 2.0mg/L, aeration control 2.0LGas/(LWaterH), aeration time 10.0h；Accelerate heterotrophism in reactor
The elutriation of bacterium and anaerobic bacteria.
4) it stands water outlet: stopping aeration, reactor static condition makes its interior muddy water mixed solution natural sedimentation, realizes solid-liquid
Separation, is discharged supernatant, and standing water discharging time is 2.0h；
5) 10~20 step 2~steps 4) are repeated；
6) pH impacts: after step 5), treatment sewage is imported into reactor, while reducing aeration quantity, and uses carbon
The pH of sour hydrogen sodium medicament adjustment mixed liquor, aeration control is in 1.5LGas/(LWaterH)~2.0LGas/(LWaterH), DO is lower than
0.5mg/L, pH 8.5；At this point, sbr reactor device cycle of operation process are as follows: 0.2~0.5h of water inlet, aeration 3.0~6.0h, standing
(precipitating) 0.5h~1.0h is discharged 0.2~0.5h, new treatment sewage is filled into reactor after the completion of operation, under
Period run 10 periods of such continuous operation of one wheel.
Above-mentioned sbr reactor device run the 0th day~the 15th day when (first stage), by aeration and pH load impact with
Afterwards, pH=8.5 or so is adjusted by way of adding sodium bicarbonate, controls sbr reactor device operating condition are as follows: water inlet 0.2~
0.5h, aeration 6.0h, (precipitating) 0.5h~1h is stood, is discharged 0.2~0.5h, run 7d.In this stage adjustment period, due to detesting
Oxygen bacterium and NOB are influenced by overexposure and pH impact load, and AOB has the advantage in reactor at this time, but at this time AOB due to strain number
Measure it is low, in activity adjustment the laundering period, NO2 -- N accumulation rate is lower, the experimental results showed that, NH of intaking at this time4 +- N removal efficiency
It is relatively slow, 6h is lasted under low-oxygen aeration, NH may be implemented4 +- N removal rate is up to 93.0%.At this point, mainly occurring in this stage reactors
Complete nitrification reaction.Utility model device runs first stage NH4 +-N、NO2 --N、NO3- N concentration figure of changing is visible attached
Fig. 2.
Above-mentioned sbr reactor device is when running the 16th day~the 20th day (second stage), with the continuous proliferation of AOB strain,
Under conditions of controlling boundary condition is suitable for AOB growth, with the variation for nitrifying strain density and distribution in reactor, NH4 +- N is complete
Aeration time needed for full removal is reduced to 5h.Control sbr reactor device operating condition are as follows: water inlet 0.2~0.5h, aeration+stirring
5.0h, standing (precipitating) 0.5h~1h, be discharged 0.2~0.5h, run 5d (ammonia nitrogen removal frank can reach 97%), AOB compared to
NOB, proportion start to be gradually increased, therefore in this stage, NO2 -- N accumulation rate gradually rises, and up to 47.9%.This
Utility model device runs second stage NH4 +-N、NO2 --N、NO3The visible attached drawing 3 of-N concentration figure of changing.
Above-mentioned sbr reactor device controls sbr reactor device operating condition when running the 21st day~the 25th day (phase III)
Are as follows: 0.2~0.5h of water inlet, aeration+stirring 4.0h, (precipitating) 0.5h~1h is stood, be discharged 0.2~0.5h, runs 5d.Further
Shorten aeration time to 4h, increase ratio shared by AOB, after continuous operation 5 days, ammonia nitrogen removal frank is close to 100%, NO2 -- N product
Tired rate reaches 95%, realizes NH4 +- N oxygenation efficiency height, NO2 -The high short distance nitration process of-N cumulative percentage.Utility model device fortune
Row phase III NH4 +-N、NO2 --N、NO3The visible attached drawing 4 of-N concentration figure of changing.
Above-mentioned sbr reactor device is when running the 26th day~the 30th day (fourth stage), with the further increasing of AOB strain
Long, sbr reactor device handles low C/N further to be shortened than the realization time of city domestic sewage short distance nitration, further adjusts SBR
Reactor operating condition are as follows: 0.2~0.5h of water inlet, aeration+stirring 3.0h, standing (precipitating) 0.5h~1h, water outlet 0.2~
0.5h, at this point, NO2 -- N accumulation rate reaches 99%, so far, realizes low C/N than city domestic sewage short distance nitration and optimizes control
System.Realize NH4 +- N oxygenation efficiency height, NO2 -The high short distance nitration process of-N cumulative percentage.Utility model device runs fourth order
Section NH4 +-N、NO2 --N、NO3The visible attached drawing 5 of-N concentration figure of changing.
According to above-mentioned specific implementation step, for a whole set of SBR short distance nitration processing system after culture in 1 month, success is real
Existing NO2 -The efficient accumulation of-N, NO2 -- N accumulation rate reaches 99%.The a whole set of SBR short distance nitration processing system cycle of operation it is most short can
Control is in 4h.
Above-described embodiment is only specific embodiment of the utility model, not is used to limit the implementation model of the utility model
It encloses；It is i.e. all according to equivalent changes and modifications made by the content of the present invention, it is all claimed for the utility model claims
Range covered.
Claims (6)
1. a kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting, it is characterised in that: including sbr reactor
Device；Aerator, DO sensor, agitating device and pH sensor are equipped in sbr reactor device；Sbr reactor device is distinguished by pipeline
It is connected with intake pump and water outlet pump；The bottom of sbr reactor device is equipped with sludge pipe.
2. a kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting according to claim 1,
Be characterized in that: aerator is connected by pipeline with gas flowmeter and blowing plant.
3. a kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting according to claim 1,
Be characterized in that: DO sensor is connected with DO analyzer.
4. a kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting according to claim 1,
Be characterized in that: pH sensor is connected with pH value analyzer.
5. a kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting according to claim 1,
Be characterized in that: intake pump is connected by pipeline with raw water box.
6. a kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting according to claim 1,
Be characterized in that: the side wall of sbr reactor device is equipped with several sample taps.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108640265A (en) * | 2018-05-28 | 2018-10-12 | 广州市市政工程设计研究总院有限公司 | A kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting and method |
| CN110054284A (en) * | 2019-05-31 | 2019-07-26 | 苏州科技大学 | The semi-hitrosation technique of municipal sewage treatment starts and control method |
-
2018
- 2018-05-28 CN CN201820809232.5U patent/CN208700677U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108640265A (en) * | 2018-05-28 | 2018-10-12 | 广州市市政工程设计研究总院有限公司 | A kind of room temperature low ratio of carbon to ammonium city domestic sewage short distance nitration device for rapidly starting and method |
| CN108640265B (en) * | 2018-05-28 | 2024-01-23 | 广州市市政工程设计研究总院有限公司 | Quick start device and method for shortcut nitrification of urban domestic sewage at normal temperature and low carbon nitrogen ratio |
| CN110054284A (en) * | 2019-05-31 | 2019-07-26 | 苏州科技大学 | The semi-hitrosation technique of municipal sewage treatment starts and control method |
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