CN101402488A - CAST segmenting water feed reinforced denitrification process control system - Google Patents
CAST segmenting water feed reinforced denitrification process control system Download PDFInfo
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- CN101402488A CN101402488A CNA2008102270527A CN200810227052A CN101402488A CN 101402488 A CN101402488 A CN 101402488A CN A2008102270527 A CNA2008102270527 A CN A2008102270527A CN 200810227052 A CN200810227052 A CN 200810227052A CN 101402488 A CN101402488 A CN 101402488A
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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
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Abstract
The invention relates to a control system for a CAST segmental inputted water reinforced denitrification process, which is suitable for the treatment of industrial waste water containing nitrogen and the reinforced treatment of town sewage. The control system comprises a selector, a main reaction area, a water feeding pump, a stirrer, an immersed water stirrer, a reflux sludge pump, an aerator arranged on the bottom of the main reaction area, an air compressor connected with the aerator, a drain valve, a sludge discharge valve for discharging the excess sludge in the main reaction area, and ORP, pH sensors and an on-line control system connected with a computer. The on-line control system is connected with a time relay which is connected with the water feeding pump, the stirrer, the immersed water stirrer, the reflux sludge pump, the air compressor, the drain valve and the sludge discharge valve. The control system adopts an on-line control strategy to control the aerobic aeration time and anoxia stirring time in the biological denitrification process, thereby solving the problems of nitrification or incomplete denitrification caused by deficient aeration or stirring time and the problems of improved operating cost and energy waste caused by overlong aeration or stirring time.
Description
Technical field
The present invention relates to CAST (circulating type active sludge method) segmental influent strengthened denitrification program control system, be applicable to nitrogenous Industrial Wastewater Treatment and town sewage intensive treatment, belong to SBR (sequencing batch active sludge) and modification process spent water bio-denitrification technology field thereof.
Background technology
Eutrophication problem is one of topmost water pollution problems of facing of various countries, the world today, although China's municipal sewage treatment rate improves constantly in recent years, do not obtain basic solution but pollute the body eutrophication problem that causes, even serious day by day trend is arranged by nitrogen, phosphorus.Large-scale freshwater lake of China and immediate offshore area all reach the eutrophic pollution of moderate or severe.China has increased total nitrogen, the highest permission emission concentration of total phosphorus in " the urban wastewater treatment firm pollutant emission standard " of new promulgation in 2002, simultaneously also the water outlet ammonia nitrogen has been proposed stricter requirement, the principal contradiction of visible sewage disposal is changed into the removal of nitrogen and phosphorus pollutants gradually by the removal of organic pollutant.Phosphorus in the sewage can be removed by dosing coagulant usually, but since nitrogen compound (as NH
4 +And NO
3 -) molecular weight ratio less, can't remove by adding medicament; In addition, if utilize membrane technique to remove nitrogen compound, only reverse osmosis membrane technology is the most effective, but this method cost is too expensive, is difficult to apply; And other membrane technology all can't effectively be removed nitrogen compound in the sewage as methods such as nanofiltration, micro-filtrations, so the removal of nitrogen is the difficult point and the emphasis of advanced treatment of wastewater, has only the bio-denitrification technology of utilization thoroughly to remove.
Biological denitrification process mainly is divided into two portions, promptly by nitrification ammonia nitrogen is converted into nitrate nitrogen, by denitrification nitrate nitrogen is converted into nitrogen again and overflows from water.Traditional bio-denitrifying sewage technology such as A/O, A
2/ O technology, the controllability of its operational process is relatively poor, and the clearance of nitrogen is difficult to reach more than 80%.
CAST is a kind of deformation technique of SBR method, sets up a biological selector on the basis of SBR, suppress Filamentous Bulking generation and good denitrogenation dephosphorizing effect in the hope of obtaining, yet how undesirable the denitrogenation dephosphorizing effect of this technology is in practice.
In existing C AST technology, water inlet-reaction, precipitation, the time in each stage of draining are changeless, for example a typical cycle of operation comprises 4 hours, wherein be water inlet-aeration phase in 2 hours, 1 hour is precipitate phase, other 1 hour is bleeding stage, and such operation scheme is at the average water quality of former water and definite.And raw water quality is that the fluctuation variation is not changeless, the mode that obvious this fixed operation scheme is not a kind of optimization.For example, when Pollutant levels increased than mean concns in the water inlet, if 2 hours flooding time is constant, aeration rate was also constant simultaneously, and 2 hours aerated reaction time is just not enough so; Equally, when Pollutant levels reduced in the water inlet, 2 hours aerated reaction time was just too much wasted so.And although 2 hours aerated reaction time may be satisfied the needs of nitration reaction, owing to there is not the enough anoxic denitrification time, the removal efficient of total nitrogen can be affected.Therefore, in order to realize saving energy and reduce the cost, and guarantee to need a kind of optimization operation scheme that can regulate each time in stage according to raw water quality by the technology effluent quality.
Summary of the invention
The object of the invention provides a kind of CAST segmental influent strengthened denitrification on-line control system, this system not only can improve processing efficiency, reduce running cost, and when bigger variation takes place in the water inlet Pollutant levels, owing to adopted online process control still can control alternately anoxic/aerobic time exactly, the capacity of resisting impact load of total system improved greatly.
The operation scheme that the present invention adopts water inlet several times is integrated with on-line control system, and has made full use of the organic carbon source in the raw waste water, nitrated, the denitrifying time in each stage of distribution that the while is scientific and reasonable.Increase the anoxia stirring stage, and adopt and become duration anoxic/aerobic mode and move, and the time of control aerobic aeration and anoxia stirring is realized by the on-line Control strategy.
The present invention has taked following technical scheme.The present invention includes selector switch, main reaction region, raw waste water is squeezed into intake pump in the selector switch, be arranged on the agitator in the selector switch, be arranged on the submersible agitator in the main reaction region, be used for mud is back to from main reaction region the return sludge pump of selector switch, the set aerator in main reaction region bottom, be connected the air compressor on the aerator, be used for the water discharge valve of treat effluent from the main reaction region discharge, be used to discharge the mud valve of excess sludge in the main reaction region, on-line control system, the DO that is connected with on-line control system (dissolved oxygen), ORP (redox potential), the pH transmitter.Described on-line control system is used to control and comprises the time relay that is connected intake pump, agitator, submersible agitator, return sludge pump, air compressor, water discharge valve and mud valve, computer and connect on computers data collecting card.
When adopting said apparatus that sewage is carried out denitrogenation processing, may further comprise the steps:
1) water inlet is opened intake pump and is opened agitator in the selector switch by on-line control system; Open return sludge pump in the time of water inlet, under predefined quantity of reflux, mud is back to selector switch by the main reaction region end;
2) submersible agitator in the main reaction region is opened in water inlet/stirring simultaneously while intaking, system carries out the anoxic denitrification denitrification process, the denitrification process is by DO, ORP, the monitoring of pH on-line sensor, and in real time the data information transfer that is obtained is handled to computer by data collecting card, finally reach control to water inlet and churning time, maximum value appears on pH value curve, on the ORP curve flex point appears simultaneously, show that denitrification process finishes, close intake pump and submersible agitator this moment, and stopping into, water stirs;
3) after aeration stops into water and stirs, open air compressor by on-line control system, the pressurized air that is provided by air compressor enters aerator, and the nitrification of organic degraded and nitrogenous compound is carried out in oxygen supply in the main reaction region mixed solution.Whole process is by DO, ORP, the monitoring of pH transmitter, and by data collecting card in real time with the data transmission that obtained on-line Control to computer-implemented aeration time, mnm. appears on pH value curve, on the ORP curve platform appears simultaneously, show that nitrifying process finishes, close air compressor this moment, stops aeration, and system enters next process then.
4) repeat to add raw waste water denitrification and back aeration repeating step 2), two steps of step 3), the multiple number of times is with raw waste water water quality and handle the water yield and require to change;
When 5) precipitation aeration operation finishes, according to predefined time control sedimentation time, intake pump, agitator, submersible agitator, return sludge pump, air compressor, water discharge valve and mud valve all are in closing condition at this moment by the time relay in the on-line control system;
6) after the draining precipitate phase finishes, regulate by on-line control system, will handle back water and discharge through water discharge valve, water discharge time is by the time relay control that is connected on the water discharge valve;
7) leave unused under on-line control system is regulated, intrasystem all valves of entire reaction, rly. and volume pump are all closed, and the reactor also not draining of neither intaking is in holding state;
8) system's repeating step 1 successively)～step 7), automatically regulate each step duration according to raw water quality or water yield variation, total system alternately experiences anaerobism, anoxic, good oxygen condition, segmental influent and intermittently water outlet, and when each end cycle, regularly discharge remaining active sludge via mud valve.
Principle of work of the present invention and process:
(1) add raw waste water, the amount of the organic carbon source that can be utilized by denitrifying bacteria that wherein contains is just satisfied go up in the system one-period the residual denitrifying requirement of nitric nitrogen.The denitrification process nitric nitrogen constantly is reduced to nitrogen, makes the interior oxidation state material of reactive system constantly reduce, so the constantly decline of ORP value, and after denitrification finished fully, owing to entered anaerobic state, the ORP fall off rate was accelerated, and flex point appears in the ORP curve.Denitrification process so the pH value can continue to rise, when denitrification finishes, owing to enter the anaerobic fermentation acid phase, so the pH value can become decline by rising, weight break point occurs owing to constantly produce basicity simultaneously.According to above unique point, we can accurately judge the process of anti-nitration reaction, when denitrification finishes, stop to stir.
(2) start air compressor and carry out aeration, organism in the aerobic removal water is oxidized to nitric nitrogen with ammonia nitrogen in the water then, promptly carries out nitration reaction.The bubble that produces in the aeration process makes sewage fully contact with active sludge, has played the effect that mixes.Organism and ammonia nitrogen are aerobic processeses in the active sludge oxidation water, therefore when organic matter degradation fully, during the nitration reaction end, oxygen in water will no longer be utilized by microorganism, so rising to can appear in the DO value, water oxygen attitude material also no longer increases, and platform appears in the ORP value.Nitration reaction is a reaction of producing acid simultaneously, and therefore when nitration reaction finished, the pH value can become rising by decline.According to above unique point, the reaction process in our the accurately understanding system when nitration reaction finishes, stops aeration, has avoided excessive aeration and the energy wasted.
(3) add an amount of raw waste water, make the amount of the organic carbon source that can be utilized by denitrifying bacteria that wherein contains just satisfy the denitrifying requirement of nitric nitrogen that aeration phase produces.According to the unique point on pH and the ORP curve process of anti-nitration reaction is controlled, when denitrification finishes, stopped to stir.
(4) carry out aeration again, make the ammonia nitrogen that adds raw waste water and bring system into all be converted into nitric nitrogen, reaction process is still controlled according to the change point of DO, ORP, pH value.
(5) repeat to add the process (n time) that an amount of raw waste water carries out denitrification and back aeration.All online detections of all processes DO, ORP, the pH value of reaction are discerned the unique point of on-line parameter according to the control strategy of on-line control system, and each stepping journey of reacting is carried out process control.
(6) after reaction process finishes, enter precipitation, draining, idle stage successively, and repeat above step successively with certain cycle, and regularly discharge mud according to sludge age.
The present invention has following advantage:
1) adopts aerobic aeration and anoxia stirring time in the on-line Control policy control biological denitrification process, fundamentally solved the not enough caused nitrated or denitrification of aeration or churning time not exclusively and aeration or the raising of the long running cost of bringing of churning time and the waste of the energy.And former water dosage, reaction times that can be required, realize having intelligentized control according to each biochemical reaction of variation on-line Control of the raw water quality water yield.
2) whole technology is finished by on-line control system, has bookkeeping conveniently, and expense is low, anti impulsion load is strong and difficult generation sludge bulking.
Samll cities and towns' municipal effluent or organism, nitrogen content changed the processing of trade effluent greatly during the present invention can be widely used in, and were specially adapted to adopt the sewage work of CAST technology or the sewage work of preparing to adopt CAST technology.
Description of drawings
Fig. 1 is the operation synoptic diagram that the present invention operates
Fig. 2 is apparatus of the present invention structural representations
Among the figure: 1. selector switch; 2. main reaction region; 3. intake pump; 4. agitator; 5. submersible agitator; 6. return sludge pump; 7. aerator; 8. air compressor; 9. water discharge valve; 10. mud valve; 11. on-line control system; 12.DO, ORP, pH transmitter.
Embodiment
Describe the present invention in detail below in conjunction with drawings and Examples:
Device provided by the invention is as shown in Figure 2: comprise that (the pond body is divided into two portions to the rectangular parallelepiped reaction tank, front end is a selector switch 1, the rear end is a main reaction region 2), raw waste water is squeezed into intake pump 3 in the selector switch 1, be arranged on the agitator 4 in the selector switch 1, be arranged on the submersible agitator 5 in the main reaction region 2, be used for mud is back to from main reaction region 2 return sludge pump 6 of selector switch 1, the set aerator 7 in main reaction region 2 bottoms, be connected the air compressor 8 on the aerator 7, be used for the water discharge valve 9 of treat effluent from main reaction region 2 discharges, be used to discharge the mud valve 10 of excess sludge in the main reaction region 2, on-line control system 11, the DO (dissolved oxygen) that is connected with on-line control system 11, ORP (redox potential), pH transmitter 12.Described on-line control system 11 is used to control and comprises the time relay that is connected intake pump 3, agitator 4, submersible agitator 5, return sludge pump 6, air compressor 8, water discharge valve 9 and mud valve 10, computer and connect on computers data collecting card.
The process control step of the CAST subsection water-feeding deep denitrogenation in the present embodiment comprises following operation as shown in Figure 1:
I intake CAST segmental influent and biological denitrification technology provided by the present invention the operation operation as shown in Figure 1, at first start by on-line control system 11 that waste water that intake pumps 3 and return sludge pump 6 will be pending injects the selector switch 1 of CAST reactor and with main reaction region 2 mixed-liquor returns to selector switch 1, open selector switch 1 interior agitator 4 and make mud and raw waste water thorough mixing.
The III aeration starts air compressor 8, be adjusted to an amount of aeration rate reactive system is carried out aeration, the pressurized air that is provided by air compressor 8 enters aerator 7 by inlet pipe, with the form of micro-bubble to the efficient oxygen supply of active sludge intermixture, and sewage is fully contacted with active sludge, whole process is implemented control by on-line control system 11, main according to the DO that is settled in the reaction tank, ORP, the unique point that pH transmitter 12 is shown in reaction process is obtained the information of reaction process indirectly, and in real time the data information transfer that is obtained is handled to computer by data collecting card again, finally reach control to aeration time, after on-line control system 11 obtains characterizing the nitrated signal of finishing, close air compressor 8, stop aeration, system enters the IV procedure then.
IV repeats to add the raw waste water denitrification and the back aeration repeats to add the process that an amount of raw waste water carries out denitrification and back aeration, and the multiple number of times requires to change the same II of operation steps, III with raw waste water water quality, the processing water yield and water outlet.
When the nitrated operation of V precipitation aeration finishes, according to predefined time control sedimentation time, intake pump 3, agitator 4, submersible agitator 5, return sludge pump 6, air compressor 8, water discharge valve 9 and mud valve 10 all are in closing condition at this moment by the time relay in the on-line control system 11.
After VI draining precipitation operation finished, drainage procedure started (VI procedure).Regulate by on-line control system 11, will handle back water and discharge through water discharge valve 9, water discharge time is by the time relay control that is connected on the water discharge valve 9.
The idle draining of VII finishes to begin to be defined as lay-up period (VII procedure) to next cycle.As required, set idle mixing time, under on-line control system 11 was regulated, intrasystem all valves of entire reaction, rly. and volume pump were all closed, and the reaction tank also not draining of promptly not intaking is in holding state.
The VIII total system repeats water inlet/stirring, aeration, precipitation, draining and idle 5 operations in turn by on-line control system 11 controls, make total system be in anaerobism, anoxic, aerobic alternative state all the time, segmental influent and water outlet, and when each end cycle, open mud valve 10 and regularly discharge remaining active sludge via shore pipe.
Samll cities and towns' municipal sewage treatment during the present invention can be widely used in is specially adapted to adopt the sewage work of CAST technology or the sewage work of preparing to adopt CAST technology.At first should possess DO, ORP and pH value online detection instrument, treat after the system stable operation, observation DO, ORP and the pH value Changing Pattern in removing organism, nitrification and denitrification biochemical reaction process, characteristic rule according to the parameter variation, software, the hardware system of on-line Control are combined with DO, ORP, the online detection of pH value, and adjust some parameter and control law according to practical operation situation, for example reflux ratio, sedimentation time etc. are to obtain the ideal effluent quality.
Embodiment:
With the real life sewage of certain university dependents' district discharging as experimental subjects (pH=6.5～7.8, COD=260～350mg/L, TN=60～85mg/L, TP=3.5～6.8mg/L).Initial MLSS is at 3.5～4.0g/L in the selected CAST reactor useful volume 18L, reactor, and aeration rate is constant in 0.25m
3/ h, mud maintains about 10d age, 23 ℃ of temperature of reaction.Utilize CAST segmental influent strengthened denitrification program control system, handle water yield 6L, the segmentation number of times is 3 times, the COD clearance reaches more than 85%, nitrogen removal rate surpasses 90%, total tp removal rate greater than COD in 90% final outflow water less than 50mg/L, total nitrogen less than 10mg/L, be lower than the desired total nitrogen concentration of national grade one discharge standard.
Claims (1)
1, CAST segmental influent strengthened denitrification program control system includes selector switch (1), main reaction region (2), raw waste water is squeezed into the interior intake pump (3) of selector switch (1), be arranged on the agitator (4) in the selector switch (1), be arranged on the submersible agitator (5) in the main reaction region (2), be used for mud is back to from main reaction region (2) return sludge pump (6) of selector switch (1), main reaction region (2) bottom set aerator (7), be connected the air compressor (8) on the aerator (7), be used for the water discharge valve (9) of treat effluent from main reaction region (2) discharge, be used to discharge the mud valve (10) and the DO that is connected with computer of the interior excess sludge of main reaction region (2), ORP, pH transmitter (12); It is characterized in that: also comprise on-line control system (11), on-line control system (11) links to each other with the time relay on being connected intake pump (3), agitator (4), submersible agitator (5), return sludge pump (6), air compressor (8), water discharge valve (9) and mud valve (10); On-line control system (11) also links to each other with computer.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583745A (en) * | 2012-03-08 | 2012-07-18 | 天津城市建设学院 | Improved in-situ excess sludge decrement control method through cyclic activated sludge technology |
| CN104111666A (en) * | 2014-06-19 | 2014-10-22 | 杨安康 | Optimized CAST domestic sewage sludge reduction control system and working method |
| CN109574216A (en) * | 2018-12-22 | 2019-04-05 | 北京工业大学 | The control system of the coupling integrated Anammox SBBR advanced nitrogen of segmental influent |
| CN109574217A (en) * | 2018-12-22 | 2019-04-05 | 北京工业大学 | A kind of method of the coupling integrated Anammox efficient denitrification of segmental influent |
-
2008
- 2008-11-21 CN CN2008102270527A patent/CN101402488B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583745A (en) * | 2012-03-08 | 2012-07-18 | 天津城市建设学院 | Improved in-situ excess sludge decrement control method through cyclic activated sludge technology |
| CN104111666A (en) * | 2014-06-19 | 2014-10-22 | 杨安康 | Optimized CAST domestic sewage sludge reduction control system and working method |
| CN109574216A (en) * | 2018-12-22 | 2019-04-05 | 北京工业大学 | The control system of the coupling integrated Anammox SBBR advanced nitrogen of segmental influent |
| CN109574217A (en) * | 2018-12-22 | 2019-04-05 | 北京工业大学 | A kind of method of the coupling integrated Anammox efficient denitrification of segmental influent |
| CN109574216B (en) * | 2018-12-22 | 2021-10-22 | 北京工业大学 | Control system for integrated anaerobic ammonia oxidation SBBR (sequencing batch reactor) deep denitrification through segmented water inlet coupling |
| CN109574217B (en) * | 2018-12-22 | 2021-10-26 | 北京工业大学 | Method for efficiently denitrifying anaerobic ammonia oxidation integrated by coupling sectional water inflow |
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| CN101402488B (en) | 2012-05-23 |
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