CN104150687A - Sewage treatment automatic control device for reducing production of N2O and operation method of sewage treatment automatic control device - Google Patents
Sewage treatment automatic control device for reducing production of N2O and operation method of sewage treatment automatic control device Download PDFInfo
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- CN104150687A CN104150687A CN201410349361.7A CN201410349361A CN104150687A CN 104150687 A CN104150687 A CN 104150687A CN 201410349361 A CN201410349361 A CN 201410349361A CN 104150687 A CN104150687 A CN 104150687A
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- pond
- treatment pond
- sewage
- aerobic
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- 239000010865 sewage Substances 0.000 title claims abstract description 81
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 title abstract description 5
- 230000001603 reducing Effects 0.000 title abstract description 5
- 238000004519 manufacturing process Methods 0.000 title abstract 3
- 239000000523 sample Substances 0.000 claims abstract description 46
- 238000010992 reflux Methods 0.000 claims abstract description 42
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 239000010802 sludge Substances 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 239000002699 waste material Substances 0.000 claims description 17
- 238000005273 aeration Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 239000010801 sewage sludge Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 33
- 238000004065 wastewater treatment Methods 0.000 abstract description 7
- 238000004062 sedimentation Methods 0.000 abstract 2
- 230000001131 transforming Effects 0.000 abstract 1
- 230000037250 Clearance Effects 0.000 description 6
- 230000035512 clearance Effects 0.000 description 6
- 241000276438 Gadus morhua Species 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 4
- 235000019516 cod Nutrition 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000006396 nitration reaction Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- 238000011068 load Methods 0.000 description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-M nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000001546 nitrifying Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000000630 rising Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 206010002660 Anoxia Diseases 0.000 description 1
- 241000976983 Anoxia Species 0.000 description 1
- 210000003128 Head Anatomy 0.000 description 1
- 241001453382 Nitrosomonadales Species 0.000 description 1
- CVTZKFWZDBJAHE-UHFFFAOYSA-N [N].N Chemical compound [N].N CVTZKFWZDBJAHE-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000000102 heterotrophic Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006241 metabolic reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Abstract
The invention discloses a sewage treatment automatic control device for reducing the production of N2O and an operation method of the sewage treatment automatic control device. The technical scheme of the invention is characterized in that the sewage treatment automatic control device for reducing the production of N2O comprises an anaerobic treatment tank, an anoxic treatment tank, an aerobic treatment tank and a sludge sedimentation tank, wherein the anoxic treatment tank is communicated with the aerobic treatment tank by virtue of an internal circulation reflux pump and a pipeline; the anaerobic treatment tank is communicated with the sludge sedimentation tank by virtue of an external circulation reflux pump and the pipeline; an anaerobic treatment tank NO2 detection probe, an anoxic treatment tank NO2 detection probe, an aerobic treatment tank NO2 detection probe, a dissolved oxygen detection probe, an auxiliary air pump, the internal circulation reflux pump and the external circulation reflux pump are respectively connected with a PLC (programmable logic controller) computer control system by virtue of conductive wires. The invention also discloses the operation method of the sewage treatment automatic control device. The sewage treatment automatic control device disclosed by the invention can be widely applied to various actual wastewater treatment processes, can be used for transforming and assembling equipment according to the actual conditions of an existing sewage plant, is simple and feasible, and is strong in operability.
Description
Technical field
The invention belongs to dirty water living creature processing technique field, relate to Wastewater Treated by Activated Sludge Process system automatic control technology, be specifically related to a kind of minimizing N
2automatic control device for sewage treatment and working method thereof that O produces.
Background technology
Along with developing rapidly and social progress of world economy, the mankind increase year by year to the greenhouse gases that enter in atmosphere, the a series of serious ecological problems such as sea level rise, polar region ice and snow area minimizing that caused global warming, and then caused the extensive concern of various countries, the whole world.N
2o is a kind of important greenhouse gases, and its Greenhouse effect are CO
2296 times.Meanwhile, N
2o or a kind of material damaging the ozone layer.Therefore, how effectively to reduce N
2the generation of O and release are one of hot issues that investigator pays close attention to both at home and abroad in recent years.
Research shows, city domestic sewage treatment plant is N
2the important generation source of O.A vital role of city domestic sewage treatment plant is to realize the removal of nitrogen-containing pollutant in sewage, and bio-denitrifying sewage process comprises two different metabolic reactions of nitrification and denitrification, and two reaction process all can produce N
2o.Nitrifying process is mainly realized NH by nitrifier (as ammonia oxidizing bacteria) under aerobic condition
4 +or NH
3oxide compound is via NO
2 -be oxidized to NO
3 -process; And denitrification process mainly by denitrifying bacterium (as heterotrophic bacterium) under anoxia condition by NO
3 -or NO
2 -be reduced into N
2o and N
2.
Much research is found, N in the nitrification and denitrification process of biological denitrificaion
2the NO of high density is all followed in the generation of O
2 -, treatment system NO
2 -accumulation be to cause N
2the immediate cause that O produces.This is because in nitrifying process, the rising of nitrite concentration can make AOB (nitrite is reduced to N by denitrification
2o) produce N
2o; In denitrification process, the rising of nitrite concentration can cause reduction and the N of denitrification efficiency
2the accumulation of O.Many N that cause
2the condition that O produces, as: first low ratio of carbon to ammonium, high ammonia nitrogen loading, high COD load and low DO etc., can cause system NO
2 -accumulation, and then discharge a large amount of N
2o(Kampschreur, M.J; Temmink, H; Kleerebezem, R; Jetten, MSM; Van Loosdrecht, MCM. Nitrous oxide emission during wastewater treatment. Water research, 2009. 43 (17): p. 4093-4103.).Therefore, by takeing effective measures, regulation system operational process, and then avoid NO
2 -accumulation phenomenon occurs, is that actual sewage treating processes realizes N
2the new route that O reduces discharging.
In recent years, around how reducing N in sanitary sewage disposal process
2this hot issue of the generation of O, investigator has carried out a large amount of work both at home and abroad, and has invented many sewage treatment process N
2related process and method that O reduces discharging, but also there are some defects.For example: the patent that publication number is CN 103466794A and CN 103466795A provides respectively sewage treatment process to reduce N
2the control method that O produces, but all for sequencing wastewater treatment device, this processing mode is applicable to the treating processes that sewage quantity is less.The biological denitrification process of municipal sewage plant is N in water treatment at present
2the major sources of O, sewage quantity is larger, generally all adopts continuous processing technique, though so these two innovation and creation can reduce preferably N
2the generation of O, but its range of application has larger limitation.Notification number is that the patent of CN 102849850B has proposed a kind of sewage denitrification dephosphorization process N
2o produces decrement control device and working method, uses dissolved oxygen, temperature, pH and the ORP online precise monitoring sewage treatment process of popping one's head in, and by computer automatic controlled system, regulates, and realizes sewage treatment process N
2o reduces discharging, yet this device need to seal reaction tank, and working method on-line monitoring project is many, and system is controlled complicated, and maintenance and construction cost are higher, are not suitable for large size city sewage work.
Along with the raising of China's Economic development and the level of urbanization, must You Gengduo sewage work come into operation future, consider huge quantity discharged and the N of sanitary sewage
2the Greenhouse effect that O is serious and the destruction to ozonosphere, research can reduce N
2automatic control device for sewage treatment and working method thereof that O produces have important practical significance.
Summary of the invention
The limitation that the present invention is directed to above-mentioned technology provides a kind of minimizing N with deficiency
2automatic control device for sewage treatment and working method thereof that O produces, for widely used urban sewage treatment process, verify by a large amount of theoretical analysises and many experiments, creatively by the NO in sewage treatment process
2 -concentration is controlled and N
2o produces and combines, and by the automatic adjusting to sewage treatment process, optimizes sewage treatment process, a large amount of strong greenhouse gas N that reduce when guaranteeing wastewater treatment efficiency
2the generation of O.
Technical scheme of the present invention is: a kind of minimizing N
2the automatic control device for sewage treatment that O produces, comprise anaerobic treatment pool, anaerobic treatment pond, aerobic treatment pond and mudpan, wherein the water outlet of anaerobic treatment pool connects anaerobic treatment pond by anaerobic treatment pool water outlet, the water outlet in anaerobic treatment pond connects aerobic treating pond by anaerobic treatment pond water outlet, the water outlet in aerobic treatment pond connects mudpan by aerobic treatment pond water outlet, described anaerobic treatment pool, in anaerobic treatment pond and mudpan, be equipped with sludge agitation device, it is characterized in that: the bottom in described aerobic treatment pond is provided with aeration tube, air pump and auxiliary air pump, wherein air pump and auxiliary air pump are connected with aeration tube, between described anaerobic treatment pond and aerobic treating pond, by inner circulating reflux pump and pipeline, be connected, for aerobic treatment pond mud mixture is inputted in anaerobic treatment pond, between described anaerobic treatment pool and mudpan, by outer circulation reflux pump and pipeline, be connected, for the mud after mudpan precipitation is inputted in anaerobic treatment pool, to maintain the sludge concentration in Sewage treatment systems, described anaerobic treatment pool, in anaerobic treatment pond and aerobic treating pond, be respectively equipped with anaerobic treatment pool NO
2 -detection probe, anaerobic treatment pond NO
2 -detection probe and aerobic treating pond NO
2 -detection probe and be provided with dissolved oxygen detection probe in aerobic treatment pond, described anaerobic treatment pool NO
2 -detection probe, anaerobic treatment pond NO
2 -detection probe, aerobic treatment pond NO
2 -detection probe, dissolved oxygen detection probe, auxiliary air pump, inner circulating reflux pump and outer circulation reflux pump are connected with PLC computerized control system by wire respectively.
A kind of minimizing N of the present invention
2the working method of the automatic control device for sewage treatment that O produces, it is characterized in that comprising the following steps: (1) treatment sewage enters anaerobic treatment pool by the water-in on anaerobic treatment pool top, the residence time of sewage in anaerobic treatment pool is 1-1.5h, in anaerobic treatment pool, the stir speed (S.S.) of muddy water agitator is 450-550r/min, is arranged on the anaerobic treatment pool NO in anaerobic treatment pool
2 -detection probe is fed back to PLC computerized control system by Real-Time Monitoring signal, as the NO monitoring
2 -when concentration is greater than 0.5mg/L, PLC computerized control system will be closed outer circulation reflux pump automatically, to reduce external reflux mud, bring the NO in anaerobic treatment pool into
3 -amount, reduces denitrification substrate, thereby reduces NO
2 -concentration, reduces N
2the generation of O, as anaerobic treatment pool NO
2 -the NO that monitoring probe monitors
2 -when concentration is not more than 0.5mg/L, PLC computerized control system will be opened outer circulation reflux pump automatically, recover the normal running status of waste disposal plant, (2) sewage of processing in anaerobic treatment pool enters anaerobic treatment pond by the overflow of anaerobic treatment pool water outlet, the residence time of sewage in anaerobic treatment pond is 1.5-2h, in anaerobic treatment pond, the stir speed (S.S.) of muddy water agitator is 450-550r/min, is arranged on the anaerobic treatment pond NO in anaerobic treatment pond
2 -monitoring probe is fed back to PLC computerized control system by Real-Time Monitoring signal, as the NO monitoring
2 -when concentration is greater than 0.5mg/L, PLC computerized control system will be closed inner circulating reflux pump automatically, to reduce internal reflux mud, bring the NO in anaerobic treatment pond into
3 -amount, reduces denitrification substrate, thereby reduces NO
2 -concentration, reduces N
2the generation of O, as anaerobic treatment pond NO
2 -the NO that monitoring probe monitors
2 -when concentration is not more than 0.5mg/L, PLC computerized control system will be opened inner circulating reflux pump automatically, and waste disposal plant recovers normal running status, (3) sewage of processing in anaerobic treatment pond enters aerobic treatment pond by the water outlet overflow of anaerobic treatment pond, and the residence time of sewage in aerobic treatment pond is 6-8h, is arranged on the aerobic treatment pond NO in aerobic treatment pond
2 -monitoring probe is fed back to PLC computerized control system by Real-Time Monitoring signal, as the NO monitoring
2 -when concentration is greater than 0.5mg/L, PLC computerized control system will be opened auxiliary air pump automatically, to increase the dissolved oxygen in aerobic treatment pond, strengthen the carrying out of nitration reaction, and then reduce NO
2 -concentration, reduces N
2the generation of O, as aerobic treating pond NO
2 -monitoring probe monitors the NO in aerobic treatment pond
2 -when concentration is not more than 0.5mg/L, and dissolved oxygen concentration is while being greater than 3mg/L, and PLC computerized control system will be closed auxiliary air pump automatically, and waste disposal plant recovers normal running status, (4) sewage of processing in aerobic treatment pond enters mudpan by the water outlet overflow of aerobic treatment pond, the residence time of sewage in mudpan is 1-2h, in mudpan, the mixing speed of muddy water agitator is 25-35r/min, in mudpan, oettIed sewage is discharged by mudpan water outlet by the overflow of mudpan overflow weir, the mud producing after mudpan, part is refluxed and is entered in anaerobic treatment pool by outer circulation reflux pump, with the whole sludge concentration in holding device, part is discharged by mudpan mud discharging mouth, output is adjusted according to apparatus sewage sludge concentration.
The present invention compared with prior art has following beneficial effect: (1) by PLC computerized control system can realization response device the online regulation and control of operation, without manual operation, need not additionally increase and carry out N
2the manual operation expense that O reduces discharging; (2) monitoring objective factor is few, and equipment structure and control principle are simple, and cost is lower, easy to maintenance; (3), when keeping waste disposal plant to pollute object height removal efficiency, realize N
2the effective generation of O declines to a great extent; (4) can be widely used in various actual waste water treating processess, according to the practical situation of existing Sewage Plant, carry out scrap build installation, simple, strong operability.
Accompanying drawing explanation
Fig. 1 reduces N in the present invention
2the structural representation of the automatic control device for sewage treatment that O produces, Fig. 2 reduces N in working method of the present invention
2the automatic control device for sewage treatment anaerobic treatment pool control strategy schematic diagram that O produces, Fig. 3 reduces N in working method of the present invention
2the automatic control device for sewage treatment anaerobic treatment pond control strategy schematic diagram that O produces, Fig. 4 reduces N in working method of the present invention
2the automatic control device for sewage treatment aerobic treatment pond control strategy schematic diagram that O produces.
Drawing explanation: 1, water-in, 2, muddy water agitator, 3, anaerobic treatment pool, 4, anaerobic treatment pond, 5, aerobic treatment pond, 6, aeration tube, 7, auxiliary air pump, 8, air pump, 9, inner circulating reflux pump, 10, outer circulation reflux pump, 11, mudpan mud discharging mouth, 12, mudpan, 13, mudpan water outlet, 14, overflow weir, 15, aerobic treatment pond water outlet, 16, aerobic treatment pond NO
2 -monitoring probe, 17, dissolved oxygen monitoring probe, 18, anaerobic treatment pond water outlet, 19, anaerobic treatment pond NO
2 -monitoring probe, 20, anaerobic treatment pool water outlet, 21, anaerobic treatment pool NO
2 -monitoring probe, 22, PLC computerized control system.
Embodiment
The present invention will be further described in conjunction with the accompanying drawings and embodiments.As shown in Figure 1, a kind of minimizing N
2the automatic control device for sewage treatment that O produces is provided with anaerobic treatment pool 3, anaerobic treatment pond 4, aerobic treatment pond 5 and mudpan 12, concrete mode of connection is: anaerobic treatment pool 3 water outlets connect anaerobic treatment pond 4 by anaerobic treatment pool water outlet 20,4 water outlets of anaerobic treatment pond connect aerobic treating pond 5 by anaerobic treatment pond water outlet 18, and 5 water outlets of aerobic treatment pond connect mudpan 12 by aerobic treatment pond water outlet 15.
Water inlet and the flow pattern of sewage in device is: the water-in 1 of disposing of sewage by anaerobic treatment pool 3 tops enters anaerobic treatment pool 3, the residence time of sewage in anaerobic treatment pool 3 is 1-1.5h, the sewage of processing in anaerobic treatment pool 3 enters anaerobic treatment pond 4 by 20 overflows of anaerobic treatment pool water outlet, this process only relies on gravity to flow, do not produce extra energy consumption, the residence time of sewage in anaerobic treatment pond 4 is 1.5-2h, the sewage of processing in anaerobic treatment pond 4 enters aerobic treatment pond 5 by water outlet 18 overflows of anaerobic treatment pond, this process only relies on gravity to flow, do not produce extra energy consumption, the residence time of sewage in aerobic treatment pond 5 is 6-8h, the sewage of processing in aerobic treatment pond 5 enters mudpan 12 by water outlet 15 overflows of aerobic treatment pond, this process only relies on gravity to flow, do not produce extra energy consumption, the residence time of sewage in mudpan 12 is 1-2h, in mudpan 12, oettIed sewage is discharged by going out the mudpan mouth of a river 13 by 14 overflows of mudpan overflow weir, this process only relies on gravity to flow, do not produce extra energy consumption, the mud producing after mudpan 12 precipitations, part is refluxed and is entered anaerobic treatment pool 3 by outer circulation reflux pump 10, with the whole sludge concentration in holding device, part is discharged by mudpan mud discharging mouth 11, output is adjusted according to apparatus sewage sludge concentration.
For keeping mud in waste disposal plant in suspended state, to be provided with muddy water agitator 2 in anaerobic treatment pool 3 and anaerobic treatment pond 4, stir speed (S.S.) is about 500r/min; For preventing forming large volume wadding piece in active sludge precipitation process, affect sludge reflux and discharge, in mudpan 12, be provided with muddy water agitator 2, mixing speed is about 30r/min.
In aerobic treatment pond 5, be provided with aeration tube 6, air pump 8 is connected with aeration tube 6 with auxiliary air pump 7, and during device operation, air pump 8 carries out aeration in aerobic treatment pond 5 by aeration tube 6, to maintain the dissolved oxygen of mud mixture in aerobic treatment pond 5.
In anaerobic treatment pool 3, be provided with anaerobic treatment pool NO
2 -monitoring probe 21, is provided with anaerobic treatment pond NO in anaerobic treatment pond 4
2 -monitoring probe 19, is provided with aerobic treatment pond NO in aerobic treatment pond
2 -monitoring probe 16 and dissolved oxygen monitoring probe 17.Anaerobic treatment pool 3 and mudpan 12 are connected by outer circulation reflux pump 10, and during the normal operation of device, outer circulation reflux pump 10 is opened, by the mud input anaerobic treatment pool 3 after precipitation in mudpan 12, to maintain the sludge concentration in Sewage treatment systems; Anaerobic treatment pond 4 and aerobic treating pond 5 are connected by inner circulating reflux pump 9, by the mud mixture input anaerobic treatment pond 4 in aerobic treatment pond 5, and in the biological denitrification process of water treatment, the NO that the nitration reaction occurring in aerobic treatment pond 5 produces
3 -, by inner circulating reflux pump 9 by NO
3 -input anaerobic treatment pond 4, and then there is anti-nitration reaction in anaerobic treatment pond 4, reach the object of denitrogenation.
Anaerobic treatment pool 3 reduces N
2the control strategy that O produces is: opening control system during waste disposal plant operation, is arranged on the anaerobic treatment pool NO in anaerobic treatment pool 3
2 -monitoring probe 21, is fed back to PLC computerized control system 22 by Real-Time Monitoring signal, as the NO monitoring
2 -when concentration is greater than 0.5mg/L, PLC computerized control system 22 will be closed external recycle of sludge reflux pump 10 automatically, to reduce external reflux mud, bring the NO in anaerobic treatment pool 3 into
3 -amount, reduces denitrification substrate, thereby reduces NO
2 -concentration, reduces N
2the generation of O, as anaerobic treatment pool NO
2 -the NO that monitoring probe 21 monitors
2 -when concentration is not more than 0.5mg/L, PLC computerized control system 22 will be opened external recycle of sludge reflux pump 10 automatically, recover the normal running status of waste disposal plant.
N is reduced in anaerobic treatment pond 4
2the control strategy that O produces is: opening control system during waste disposal plant operation, is arranged on the anaerobic treatment pond NO in anaerobic treatment pond 4
2 -monitoring probe 19, is fed back to PLC computerized control system 22 by Real-Time Monitoring signal, as the NO monitoring
2 -when concentration is greater than 0.5mg/L, PLC computerized control system 22 will be closed inner circulation of sludge reflux pump 9 automatically, to reduce internal reflux mud, bring the NO in anaerobic treatment pond 4 into
3 -amount, reduces denitrification substrate, thereby reduces NO
2 -concentration, reduces N
2the generation of O, as anaerobic treatment pond NO
2 -the NO that monitoring probe 19 monitors
2 -when concentration is not more than 0.5mg/L, PLC computerized control system 22 will be opened inner circulation of sludge reflux pump 9 automatically, and waste disposal plant recovers normal running status.
N is reduced in aerobic treatment pond 5
2the control strategy that O produces is: opening control system during waste disposal plant operation, is arranged on the aerobic treatment pond NO in aerobic treatment pond 5
2 -monitoring probe 16, is fed back to PLC computerized control system 22 by Real-Time Monitoring signal, as the NO monitoring
2 -when concentration is greater than 0.5mg/L, PLC computerized control system 22 will be opened auxiliary air pump 7 automatically, to increase the dissolved oxygen in aerobic treatment pond 5, strengthen the carrying out of nitration reaction, and then reduce NO
2 -concentration, reduces N
2the generation of O, as aerobic treating pond NO
2 -monitoring probe 16 monitors the NO in aerobic treatment pond 5
2 -concentration is not more than 0.5mg/L, and dissolved oxygen concentration is while being greater than 3mg/L, and PLC computerized control system 22 will be closed auxiliary air pump 7 automatically, and waste disposal plant recovers normal running status.
Embodiment 1
The real life wastewater treatment process of Yi Mou community discharge is example, the minimizing N of employing
2the automatic control device for sewage treatment that O produces as shown in Figure 1, the minimizing N of employing
2the automatic control of sewage treatment strategy that O produces as in Figure 2-4, the useful volume 5L of selected waste disposal plant anaerobic treatment pool, the useful volume 10L in anaerobic treatment pond, the useful volume 30L in aerobic treatment pond, the useful volume 10L of mudpan, sewage influent quality is: COD concentration 300-400mg/L, NH
4 +concentration 40-50mg/L, TN concentration 47-52mg/L, sewage load is 85L/d, reactor seed sludge adopts the fresh active sludge in Sewage Plant aerobic treatment pond, in reactor, sludge concentration maintains 2500-3000mg/L, aerobic treatment pond aeration rate is constant in 200L/h, and dissolved oxygen concentration maintains 2mg/L, and sludge age maintains 15d.
Open waste disposal plant, carry out sewage disposal under standard state, anaerobic treatment pool, anaerobic treatment pond and aerobic treating pond reduce N
2before the Controlling System that O produces is opened, wastewater treatment efficiency is: COD clearance is average 95%, NH
4 +clearance is average 95%, and TN clearance is average 80%, N
2o generation is 45-55mg/d.
Open anaerobic treatment pool, anaerobic treatment pond and aerobic treating pond and reduce N
2the Controlling System that O produces.In anaerobic treatment pool, work as NO
2 -when concentration is greater than 0.5mg/L, PLC computerized control system is closed external recycle of sludge reflux pump automatically, works as NO
2 -when concentration is not more than 0.5mg/L, outer circulation reflux pump reopens; In anaerobic treatment pond, work as NO
2 -when concentration is greater than 0.5 mg/L, PLC computerized control system is closed inner circulating reflux pump automatically, works as NO
2 -when concentration is not more than 0.5mg/L, inner circulating reflux pump reopens; In aerobic treatment pond, work as NO
2 -when concentration is greater than 0.5mg/L, PLC computerized control system is opened auxiliary air pump increases the oxygenation to aerobic treatment pond, works as NO
2 -concentration is not more than 0.5mg/L, and dissolved oxygen concentration is while being greater than 3mg/L, and auxiliary air pump is closed.
Reduce N
2after the automatic control device for sewage treatment that O produces and working method application thereof, wastewater treatment efficiency is: COD clearance is average 94%, NH
4 +clearance is average 93%, and TN clearance is average 78%, and the treatment effect of principal pollutant does not decline, and has still kept high treatment efficiency, N
2o generation is 4-6mg/d, has declined approximately 90%, when keeping waste disposal plant high treatment efficiency, has realized N
2declining to a great extent of O generation.
More than show and described ultimate principle of the present invention, principal character and advantage, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these changes and improvements all fall into claimed scope of the present invention.
Claims (2)
1. one kind is reduced N
2the automatic control device for sewage treatment that O produces, comprise anaerobic treatment pool, anaerobic treatment pond, aerobic treatment pond and mudpan, wherein the water outlet of anaerobic treatment pool connects anaerobic treatment pond by anaerobic treatment pool water outlet, the water outlet in anaerobic treatment pond connects aerobic treating pond by anaerobic treatment pond water outlet, the water outlet in aerobic treatment pond connects mudpan by aerobic treatment pond water outlet, described anaerobic treatment pool, in anaerobic treatment pond and mudpan, be equipped with sludge agitation device, it is characterized in that: the bottom in described aerobic treatment pond is provided with aeration tube, air pump and auxiliary air pump, wherein air pump and auxiliary air pump are connected with aeration tube, between described anaerobic treatment pond and aerobic treating pond, by inner circulating reflux pump and pipeline, be connected, for aerobic treatment pond mud mixture is inputted in anaerobic treatment pond, between described anaerobic treatment pool and mudpan, by outer circulation reflux pump and pipeline, be connected, for the mud after mudpan precipitation is inputted in anaerobic treatment pool, to maintain the sludge concentration in Sewage treatment systems, described anaerobic treatment pool, in anaerobic treatment pond and aerobic treating pond, be respectively equipped with anaerobic treatment pool NO
2 -detection probe, anaerobic treatment pond NO
2 -detection probe and aerobic treating pond NO
2 -detection probe and be provided with dissolved oxygen detection probe in aerobic treatment pond, described anaerobic treatment pool NO
2 -detection probe, anaerobic treatment pond NO
2 -detection probe, aerobic treatment pond NO
2 -detection probe, dissolved oxygen detection probe, auxiliary air pump, inner circulating reflux pump and outer circulation reflux pump are connected with PLC computerized control system by wire respectively.
2. a minimizing N claimed in claim 1
2the working method of the automatic control device for sewage treatment that O produces, it is characterized in that comprising the following steps: (1) treatment sewage enters anaerobic treatment pool by the water-in on anaerobic treatment pool top, the residence time of sewage in anaerobic treatment pool is 1-1.5h, in anaerobic treatment pool, the stir speed (S.S.) of muddy water agitator is 450-550r/min, is arranged on the anaerobic treatment pool NO in anaerobic treatment pool
2 -detection probe is fed back to PLC computerized control system by Real-Time Monitoring signal, as the NO monitoring
2 -when concentration is greater than 0.5mg/L, PLC computerized control system will be closed outer circulation reflux pump automatically, as anaerobic treatment pool NO
2 -the NO that monitoring probe monitors
2 -when concentration is not more than 0.5mg/L, PLC computerized control system will be opened outer circulation reflux pump automatically, recover the normal running status of waste disposal plant, (2) sewage of processing in anaerobic treatment pool enters anaerobic treatment pond by the overflow of anaerobic treatment pool water outlet, the residence time of sewage in anaerobic treatment pond is 1.5-2h, in anaerobic treatment pond, the stir speed (S.S.) of muddy water agitator is 450-550r/min, is arranged on the anaerobic treatment pond NO in anaerobic treatment pond
2 -monitoring probe is fed back to PLC computerized control system by Real-Time Monitoring signal, as the NO monitoring
2 -when concentration is greater than 0.5mg/L, PLC computerized control system will be closed inner circulating reflux pump automatically, as anaerobic treatment pond NO
2 -the NO that monitoring probe monitors
2 -when concentration is not more than 0.5mg/L, PLC computerized control system will be opened inner circulating reflux pump automatically, and waste disposal plant recovers normal running status, (3) sewage of processing in anaerobic treatment pond enters aerobic treatment pond by the water outlet overflow of anaerobic treatment pond, and the residence time of sewage in aerobic treatment pond is 6-8h, is arranged on the aerobic treatment pond NO in aerobic treatment pond
2 -monitoring probe is fed back to PLC computerized control system by Real-Time Monitoring signal, as the NO monitoring
2 -when concentration is greater than 0.5mg/L, PLC computerized control system will be opened auxiliary air pump automatically, to increase the dissolved oxygen in aerobic treatment pond, as aerobic treating pond NO
2 -monitoring probe monitors the NO in aerobic treatment pond
2 -when concentration is not more than 0.5mg/L, and dissolved oxygen concentration is while being greater than 3mg/L, and PLC computerized control system will be closed auxiliary air pump automatically, and waste disposal plant recovers normal running status, (4) sewage of processing in aerobic treatment pond enters mudpan by the water outlet overflow of aerobic treatment pond, the residence time of sewage in mudpan is 1-2h, in mudpan, the mixing speed of muddy water agitator is 25-35r/min, in mudpan, oettIed sewage is discharged by mudpan water outlet by the overflow of mudpan overflow weir, the mud producing after mudpan, part is refluxed and is entered in anaerobic treatment pool by outer circulation reflux pump, with the whole sludge concentration in holding device, part is discharged by mudpan mud discharging mouth, output is adjusted according to apparatus sewage sludge concentration.
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| CN106007171A (en) * | 2016-05-20 | 2016-10-12 | 河南师范大学 | Integrated sludge reduction recycling and N2O emission reduction sewage treatment device and method for operating same |
| CN108776429A (en) * | 2018-06-20 | 2018-11-09 | 江苏复星节能环保有限公司 | Improve biochemistry pool mixing effect method |
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