CN104671394A - Rear biological denitrifying filter automatic control system - Google Patents
Rear biological denitrifying filter automatic control system Download PDFInfo
- Publication number
- CN104671394A CN104671394A CN201510067013.5A CN201510067013A CN104671394A CN 104671394 A CN104671394 A CN 104671394A CN 201510067013 A CN201510067013 A CN 201510067013A CN 104671394 A CN104671394 A CN 104671394A
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- Prior art keywords
- filter tank
- water
- valve
- denitrogenation
- slave station
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
Abstract
The invention relates to a rear biological denitrifying filter automatic control system. The system is composed of a PLC (Programmable Logic Controller) system master station, I/O (Input/Output)slave stations, a human-computer interface and an exchanger, wherein the PLC system master station is provided with n I/O slave stations, and the I/O slave stations are respectively set as n filters in correspondence, each filter is locally configured with one remote I/O slave station, the PLC system master station controls the remote I/O slave station of each filter through an Ethernet cable, the master station exchanges data with the slave stations through the Ethernet, and the master station is configured with the human-computer interface. The system provided by the invention has the advantages of being convenient to manage and operate, low-cost and strong in resistance to shock load, and so on; the filtration performance is good, effluent suspended solids are less than 5mg/L, and effluent quality is steady; and the system is safe and reliable, can be widely used in deep treatment and recycling of municipal sewage or deep treatment of industrial wastewater with greatly varying nitrogen content, and produces high-quality recycled water.
Description
Technical field
The invention belongs to sewage treatment area, relate to the rearmounted biological denitrificaion filter tank of town sewage advanced treatment and nitrogenous Industrial Wastewater Treatment, especially a kind of rearmounted biological denitrificaion filter tank automatic control system.
Background technology
In recent years, water resources in china total amount day by day reduces, and day by day serious water environment pollution makes the tense situation of water resources aggravate further, and water resources problems has become the bottleneck of China's economic and social sustainable development.Reusing sewage contains great potential to the shortage of solution city water resource, and sewage, through suitable manipulation of regeneration, can be re-used in the multiple uses such as landscape water, green area irrigation, industry cooling, realize water resources recycling.Major part sewage work of China needs upgrading, to improve sewage disposal plant effluent water quality, realizes reuse of wastewater further.
Rearmounted biological denitrificaion filter tank is the processing unit integrating biological denitrificaion and filtering function, is the core process equipment of stain disease advanced treatment process.This filter tank uses physical separating process to remove suspended substance, and uses biological treatment to remove some soluble substance existed in sewage; Filter tank adopts coarse media usually, and suspended solids can penetrate into filter bed deep layer, and the filter tank work period extends, and filter tank adopts gas/water backwashing, guarantees cleaning required by filter tank.This filter tank is divided into three kinds of operating mode: i.e. filtered model, and backwash mode drives nitrogen pattern.Wherein backwash mode is divided into air purge, (air water) shuffle, wash three phases; Driving nitrogen is the washing being equivalent to the back flushing stage, is with pump by upwards washing by water bottom filter tank, to rinse the gas formed in denitrogenation process.
Rearmounted biological denitrificaion filter tank is sewage work's advanced nitrogen, upgrading, realize the selection process of reuse of wastewater.The technical foundation of deep-bed filter is water-gas distribution block, i.e. filter underdrain system.The basic role of filter underdrain system is, supports filter on the one hand, separates on the other hand by bottom filtrate and filter tank.Traditional water distribution system usually uses little eyelet or produces larger pressure difference, to realize the distributed uniform of back flushing water and air with the filter (screen system) of little sieve aperture.This water distribution system with small-sized perforate to be easy to by solid and microbial film block.These eyelets of tradition water distribution system constitute about 0.5% ~ 1.0% perforate cross section, deep-bed filter water-gas distribution system then has 3% ~ 4% perforate cross section, and do not re-use High Pressure Difference to the back flushing air that distributes, but use independently back flushing air distribution system.
At present, China is main to the research controlled in real time automatically in rearmounted biological denitrificaion filter tank mainly with mechanistic research, the method is not also applied to sewage work's upgrading and produces the application example of high-quality recycled water, does not naturally occur the technology that control automatically, permanent water lev el control, back-flushing method are optimized in real time yet.The technical problem underlying that current needs solve is: the easy blocking that 1, traditional filter tank technology exists, be difficult to accurately judge when filter tank needs the problem of back flushing; 2, how to control Backwashing intensity of filter accurately flexibly, after avoiding that back washing strength is excessive and causing filter back washing, time of recovery is long, and the too low microbial film of hypertrophy that makes of intensity is difficult to thoroughly get rid of from filter tank system, and the problem blocked appears in local, filter tank; 3, how to control the filter back washing time accurately flexibly, avoid causing the filter tank back flushing used water yield, back flushing tolerance excessive, increase the problem of energy consumption.4, after being difficult to ensure filter back washing, denitrification and filtering function can be recovered within the shortest time, ensure the effluent quality up to standard obtaining stable TN and suspended substance.The problems referred to above are obtained good effluent quality all to rearmounted biological denitrificaion filter tank sewage treatment process and bring practical difficulty, thus hinder the further raising of this process operation effect and applying of technique.Therefore, a kind of better more perfect rearmounted biological denitrificaion filter tank automatic control system and the perfect operation method of corresponding science is needed to propose.
Retrieved by patent document, not yet find the patent document identical or close with the present patent application.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, a kind of rearmounted biological denitrificaion filter tank automatic control system is proposed, this system is by changing the auto-controll operation mode in traditional rearmounted biological denitrificaion filter tank, and pass through real time planning, accurately can judge that rearmounted biological denitrificaion filter tank is the need of back flushing or drive nitrogen, flexible control back flushing, drive nitrogen process time used and intensity, under saving working cost condition, the back flushing in rearmounted biological denitrificaion filter tank can be ensured and drives nitrogen effect.
The object of the invention is to be achieved through the following technical solutions:
A kind of rearmounted biological denitrificaion filter tank automatic control system, be made up of PLC system main website, I/O slave station, man-machine interface and exchange board, PLC system main website is provided with n I/O slave station, and correspondence is set to n filter tank respectively, each filter tank configures a remote I/O slave station nearby, PLC system main website controls the remote I/O slave station in each filter tank by Ethernet cable, by Ethernet exchanging data between main website and slave station, and main website configuration man-machine interface.
And, described filter tank is rearmounted biological denitrificaion filter tank, this filter tank comprises pump sump, denitrogenation filter tank, backwashing sewage water pond, clean water basin and fresh water pump, gas blower, inlet channel is communicated with distribution reservoir, the water outlet of distribution reservoir is communicated with the distributing trough entering denitrogenation filter tank by water intaking valve, in denitrogenation filter tank, install ultrasonic level gage; The distributing trough in denitrogenation filter tank is communicated with backwashing sewage water pond by wastewater valve; The water outlet of going to the bottom in denitrogenation filter tank is passed through water regulating valve and is communicated with clean water basin, and this goes out water regulating valve and selects pneumatic or motor-driven control valve; Clear water sends water by fresh water pump via the bottom in washing house steward variable valve, washing valve connection denitrogenation filter tank, for washing back flushing denitrogenation filter tank; Bottom in denitrogenation filter tank is also communicated with gas blower, and this gas blower is via air purge valve air purge back flushing denitrogenation filter tank.
And, the pipeline in washing back flushing filter tank installs a water ga(u)ge, air purge counter-flushing pipeline is installed an air-flow gauge.
Advantage of the present invention and positively effect are:
1, native system achieves automatic constant water level filtering and controls: filter tank is in operation maintenance constant water level filtering, i.e. inlet and drop constant amplitude, effectively can suppress the oxygenation phenomenon to sewage, thus reduce carbon source consumption, reduce working cost, increase the denitrification empty bed residence time, reduce water outlet risk not up to standard.
2, native system achieves automatic backwash control: automatically detect filter tank resistance by PLC, according to filter tank drag size, auto-sequencing is carried out to each filter tank, ensure that filter tank can be cleaned in time, start the backwashing procedures to filter tank when reaching set(ting)value according to filter tank resistance, the working efficiency in filter tank can be improved; The time of the three phases of backwashing procedures can rule of thumb set arbitrarily, and the action of valve is controlled automatically by PLC completely, can improve the effect of back flushing, shortens backwashing time.
3, native system achieves and automatically drives nitrogen and control: automatically detect filter tank resistance by PLC, and what start filter tank system according to filter tank Resistance Value drives nitrogen program, drives nitrogen discharge and realizes current constant control, improve and drive nitrogen effect; The action of valve is controlled automatically by PLC completely, can shorten and drive the nitrogen time.
4, native system has that bookkeeping is convenient, expense is low and the advantage such as anti impulsion load is strong, good filtration effect, go out water suspension and be less than 5mg/L, stable effluent quality, safe and reliable, widespread use and city sewage deep treatment and regeneration or nitrogen content can change the advanced treatment of trade effluent greatly, the reuse water of production high-quality.
Accompanying drawing explanation
Fig. 1 is Controlling System schematic diagram of the present invention;
Fig. 2 is the Row control schematic diagram in filter tank of the present invention;
Fig. 3 is the controlling party block diagram of the permanent water level of the present invention;
Fig. 4 is flushing flow rate controlling party block diagram of the present invention.
Embodiment:
Below by specific embodiment, the invention will be further described, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
A kind of rearmounted biological denitrificaion filter tank automatic control system, see accompanying drawing 1, be made up of PLC system main website 2, I/O slave station 4, man-machine interface 1 and exchange board 3, this set-up of control system has n I/O slave station, and correspondence is set to n filter tank respectively, and each filter tank configures a remote I/O slave station nearby, PLC system main website controls the remote I/O slave station in each filter tank by Ethernet cable 5, on-site signal and order enter I/O slave station nearby, to reduce laying of on-site cable, reduce investment; By Ethernet exchanging data between main website and slave station, main website configuration man-machine interface, for the setting of operating parameter, the display of field device operation state and malfunction.
Filter tank involved in the present invention is rearmounted biological denitrificaion filter tank, and its structure as shown in Figure 2, is specifically described as follows below:
Filter tank comprises pump sump 8, denitrogenation filter tank 11, backwashing sewage water pond 13, clean water basin 14 and fresh water pump 15, gas blower 22, inlet channel 6 is communicated with distribution reservoir, carbon source 7 is added in pump sump, the water outlet of distribution reservoir is communicated with the distributing trough entering denitrogenation filter tank by water intaking valve 9, install ultrasonic level gage 10 in denitrogenation filter tank; The distributing trough in denitrogenation filter tank is communicated with backwashing sewage water pond by wastewater valve 12; The water outlet of going to the bottom in denitrogenation filter tank is passed through water regulating valve 17 and is communicated with clean water basin, and this goes out water regulating valve and selects pneumatic or motor-driven control valve; Clear water is sent water and to be communicated with bottom in denitrogenation filter tank via washing house steward variable valve 16, washing valve 19 by fresh water pump, for washing back flushing denitrogenation filter tank; Bottom in denitrogenation filter tank is also communicated with gas blower, and this gas blower is via air purge valve 20 air purge back flushing denitrogenation filter tank.
The pipeline in washing back flushing filter tank is also installed the water ga(u)ge 18 of an electromagnetism, air purge counter-flushing pipeline is also installed the air-flow gauge 21 of an electromagnetism.
Major function of the present invention is as follows:
Controlling to realize automatic constant water level filtering, needing, in every lattice filter tank, ultrasonic level gage is installed, measuring the water level in filter tank in real time; The outlet valve in every lattice filter tank should select pneumatic or motor-driven control valve, and detects the actual aperture of valve position in real time and input PLC system.When filterer's operation mode, the air purge valve in filter tank, washing valve, wastewater valve are closed, and water intaking valve is opened, outlet valve is by the aperture of PLC automatic regulating valve position, make Inlet and outlet water flow maintain equilibrium state, thus keep the actual water level in filter tank and designated water level basically identical, reach the requirement of permanent water lev el control.
The adjustment of outlet valve aperture adopts complete PID closed-loop control, sets liquid level as set-point with filter tank, and actual measurement liquid level is value of feedback, PID output valve valve setting value, controls the aperture of outlet valve.
Automatically start according to filter tank drag size to realize automatic backflushing washing procedure and automatically driving nitrogen program, first need the filter tank Resistance Setting value setting start-up routine on upper computer, the Resistance Value of its secondary Real-Time Monitoring filter.According to aforementioned control principle, in constant water level filtering pattern, the aperture of outlet valve is direct reaction filter tank drag size, therefore, detects that the aperture of water valve just can be equal to filter tank Resistance Value.Start automatic backflushing washing procedure or automatically drive nitrogen program when also having alternatives to be and to reach setting duration according to filter tank continuous operating time.
According to above-mentioned condition, by PLC program, by algorithm, auto-sequencing is carried out to the filter tank of all working, predict backwashing procedures in advance or automatically drive the job order of nitrogen.
The washing of back flushing and the discharge of driving nitrogen realize current constant control, need, on back flushing clear water house steward, variable valve and magnetic flow meter are installed, set the difference of discharge and actual measurement discharge according to clear water house steward, PID closed-loop control is carried out to the aperture of variable valve, realizes the constant of discharge.Control block diagram is see accompanying drawing 4.
Backwash process comprises air rubbing successively, air water combines recoil, clear water rinsing three phases, and the flush time in each stage rule of thumb can set in man-machine interface.The air rubbing stage, first filter tank water intaking valve is closed, open wastewater valve, close out water regulating valve, open air purge valve again, start gas blower simultaneously, carry out air purge program, the continuous air purge time is when reaching, open washing valve and start scavenging pump, enter air water associating backwash stage, when air water associating flush time arrives, close air purge valve, turn off the blast machine simultaneously, enter water rinses, the continuous washing time is when arriving, first close washing valve, close wastewater valve again, so far the backwashing procedures in this filter tank completes, then water regulating valve is opened out, open water intaking valve, enter normal filtered model.The Valve controlling of whole backwash process is completed automatically by PLC program.
When nitrogen program is driven in startup, that first closes filter tank goes out water regulating valve, open washing valve again, start fresh water pump simultaneously, the continuous driving nitrogen time completes (time of continuous driving nitrogen sets in man-machine interface), and automatic closing water washes valve, then opens outlet valve, so far drive nitrogen EP (end of program), normal filtered model is recovered in filter tank.The whole Valve controlling driving nitrogen process is completed automatically by PLC program.
Claims (3)
1. a rearmounted biological denitrificaion filter tank automatic control system, it is characterized in that: be made up of PLC system main website, I/O slave station, man-machine interface and exchange board, PLC system main website is provided with n I/O slave station, and correspondence is set to n filter tank respectively, each filter tank configures a remote I/O slave station nearby, PLC system main website controls the remote I/O slave station in each filter tank by Ethernet cable, by Ethernet exchanging data between main website and slave station, and main website configuration man-machine interface.
2. rearmounted biological denitrificaion filter tank according to claim 1 automatic control system, it is characterized in that: described filter tank is rearmounted biological denitrificaion filter tank, this filter tank comprises pump sump, denitrogenation filter tank, backwashing sewage water pond, clean water basin and fresh water pump, gas blower, inlet channel is communicated with distribution reservoir, the water outlet of distribution reservoir is communicated with the distributing trough entering denitrogenation filter tank by water intaking valve, in denitrogenation filter tank, install ultrasonic level gage; The distributing trough in denitrogenation filter tank is communicated with backwashing sewage water pond by wastewater valve; The water outlet of going to the bottom in denitrogenation filter tank is passed through water regulating valve and is communicated with clean water basin, and this goes out water regulating valve and selects pneumatic or motor-driven control valve; Clear water sends water by fresh water pump via the bottom in washing house steward variable valve, washing valve connection denitrogenation filter tank, for washing back flushing denitrogenation filter tank; Bottom in denitrogenation filter tank is also communicated with gas blower, and this gas blower is via air purge valve air purge back flushing denitrogenation filter tank.
3. rearmounted biological denitrificaion filter tank according to claim 2 automatic control system, is characterized in that: on the pipeline in washing back flushing filter tank, install a water ga(u)ge, air purge counter-flushing pipeline is installed an air-flow gauge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510067013.5A CN104671394A (en) | 2015-02-07 | 2015-02-07 | Rear biological denitrifying filter automatic control system |
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| CN201510067013.5A CN104671394A (en) | 2015-02-07 | 2015-02-07 | Rear biological denitrifying filter automatic control system |
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| CN201510067013.5A Pending CN104671394A (en) | 2015-02-07 | 2015-02-07 | Rear biological denitrifying filter automatic control system |
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Cited By (4)
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| CN104925941A (en) * | 2015-06-23 | 2015-09-23 | 扬州市洁源排水有限公司 | Denitrification filter pool |
| CN105000760A (en) * | 2015-08-14 | 2015-10-28 | 得利满水处理系统(北京)有限公司 | Technology of synchronous removal of nitrogen, phosphorus and suspended solids |
| CN105060476A (en) * | 2015-08-14 | 2015-11-18 | 得利满水处理系统(北京)有限公司 | V-shaped filter tank for deep denitrogenation |
| CN112723444A (en) * | 2021-01-06 | 2021-04-30 | 北控水务(中国)投资有限公司 | Control method and system for intelligently distributing water amount of filter tank |
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Application publication date: 20150603 |