CN104108794A - Wastewater treatment device and method of sequencing batch A/O (Anaerobic/Oxic) linked system for realizing partial nitrification of wastewater - Google Patents
Wastewater treatment device and method of sequencing batch A/O (Anaerobic/Oxic) linked system for realizing partial nitrification of wastewater Download PDFInfo
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Abstract
The invention particularly relates to a wastewater treatment device and method of a sequencing batch A/O (Anaerobic/Oxic) linked system for realizing partial nitrification of wastewater. The device is provided with an adjusting pool and an SBR (Sequencing Batch Reactor) reaction pool, wherein the SBR reaction pool is divided in an anaerobic region and an oxic region. The method for treating wastewater by using the wastewater treatment device specifically comprises the following steps that (1) wastewater enters into the adjusting pool; (2) wastewater in the adjusting pool is pumped into the anaerobic region of the SBR reaction pool through a water inlet pump for denitrification; and (3) a water flow in the anaerobic region of the SBR reaction pool overflows to the oxic region of the SBR reaction pool for linked water inlet; the oxic region of the SBR reaction pool adopts an operating mode of SBR for partial nitrification; in the water inlet stage of the oxic region of the SBR reaction pool, muddy water is simultaneously returned to the anaerobic region, backflow is stopped after water inflow in the oxic region is stopped, and effluent in the anaerobic region is overflowed to the oxic region, and the whole process is circulated like this. The carbon source in wastewater is fully used to denitrify in the anaerobic region of the SBR reaction pool.
Description
Technical field
The present invention relates to wastewater treatment equipment, be specifically related to a kind of sequence batch (A/O linked system wastewater treatment equipment and method that realizes waste water short distance nitration.
Background technology
Along with increasing the weight of of body eutrophication and water shortage problem, both at home and abroad sewage drainage standard is strictly controlled at present, especially more and more higher to the emission request of nitrogen, phosphorus.
The biological denitrificaion mode being most widely used in existing sewage disposal is nitrated/denitrification technology, is applicable to process the city domestic sewage of lower concentration.Wherein nitratedly mainly by two steps, completed, first NH
4+-N is converted into NO under the effect of ammonia nitrogen oxidizing bacteria (AOB)
2--N, this step is called as Nitritation; Then NO
2--N is converted into NO under nitrite-oxidizing bacteria (NOB) effect
3--N, this step is called as nitric acid nitrating.In denitrification process, need to consume carbon source and produce certain basicity, by NO
3--N is converted into NO
2--N is finally converted into N
2.Yet when processing as high ammonia-nitrogen wastewaters such as percolate, anaerobic digestion solutions, because carbon-nitrogen ratio in former water is lower, in denitrification process, need additional carbon, and the residence time be generally greater than 10 days, more than ton water power consumption 20 is spent.Therefore, this technique occupation of land scale is large, medicine consumes and energy consumption is higher, cost of sewage disposal is higher.
High ammonia-nitrogen wastewater have pollutant component compared with complicated, Pollutant levels compared with feature high, that quantity discharged is large, biodegradability is poor, intractability is high, be subject to the great attention of various countries' field of Environment Protection.The high-efficiency biological denitrification of high ammonia-nitrogen wastewater is difficult point and the emphasis in sewage disposal always.At present, there is the report of more and more New Biodenitrification Process in sewage treatment area both at home and abroad, such as short distance nitration.Short distance nitration is nitrated with tradition-and denitrification technology compares, and has following advantage: in short distance nitration process, save 25% oxygen requirement; In follow-up denitrification process, can save 40% carbon source; In follow-up anaerobic ammonium oxidation process, need not consume organic carbon source, ammonia nitrogen removal frank is higher.
Key one step of short distance nitration is that ammonia nitrogen is converted into nitrite under the effect of nitrite bacteria (AOB), and therefore how " inhibition-restriction-elutriation " NOB while does not affect AOB activity becomes the key that realizes high-concentration ammonia nitrogenous wastewater short distance nitration performance efficiency.The parameter that affects short distance nitration mainly contains temperature, dissolved oxygen, the water conservancy residence time, pH, free ammonia (Free Ammonia, FA), free nitrous acid (Free nitrous acid, FNA) etc.The existing method that realizes short distance nitration have control that parameter is more, schedule of operation is complicated, require influent quality stable, need to add the shortcomings such as a small amount of organic carbon source or soda acid.Therefore, this area in the urgent need to a kind of simple to operate, be easy to the high ammonia-nitrogen wastewater short distance nitration pretreatment unit controlled.
Summary of the invention
Primary and foremost purpose of the present invention is that the shortcoming that overcomes prior art is with not enough, a kind of sequence batch (A/O linked system (SAON:Sequencing Anoxic-oxic Nitritation) wastewater treatment equipment of realizing waste water short distance nitration is provided, this processing waste water plant is applicable to the pre-treatment of high ammonia-nitrogen wastewater short distance nitration, is mainly changing food waste Digestive system, percolate, sludge digestion supernatant liquor, food industrial wastewater, herding waste water, wastewater from chemical industry etc.
Another object of the present invention is to provide the above-mentioned wastewater treatment equipment of application to process the method for waste water.
A further object of the present invention is to provide the application of above-mentioned wastewater treatment equipment.
Object of the present invention is achieved through the following technical solutions:
A sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration, is provided with equalizing tank, sbr reactor pond, and described sbr reactor pond comprises oxygen-starved area, sbr reactor pond and aerobic zone, sbr reactor pond;
Described equalizing tank is communicated with oxygen-starved area, sbr reactor pond by intake pump and first liquid under meter successively;
Described oxygen-starved area, sbr reactor pond is communicated with aerobic zone, sbr reactor pond by overflow groove;
Described aerobic zone, sbr reactor pond inner bottom part is provided with aeration tube, and described aeration tube is connected with aerator by gas meter;
Described inside, aerobic zone, sbr reactor pond is provided with strains hydrophone;
Bottom, described aerobic zone, sbr reactor pond is communicated with reflux pump and second liquid under meter and bottom, oxygen-starved area, sbr reactor pond successively by reflux line;
Described equalizing tank inside is provided with the first agitator and heating unit;
Described inside, oxygen-starved area, sbr reactor pond is provided with the second agitator, the first pH meter and ORP meter;
Described inside, aerobic zone, sbr reactor pond is provided with the 3rd agitator, the second pH meter, DO meter, liquid level sensor and temperature sensor;
The volume ratio of described oxygen-starved area, sbr reactor pond and aerobic zone, sbr reactor pond is 1:(3～5);
The first described pH meter, the second pH meter, DO meter, ORP meter, temperature sensor, first liquid under meter, second liquid under meter, liquid level sensor, gas meter are connected with PLC controller respectively;
Described PLC controller with by computer receiving digital signals the computer of exporting control signal, be connected; Described PLC controller respectively with intake pump, aerator, the first agitator, the second agitator, the 3rd agitator, heating unit, strain hydrophone, reflux pump is connected.
The described sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration is applicable to the pre-treatment of high ammonia-nitrogen wastewater short distance nitration, is mainly changing food waste Digestive system, percolate, sludge digestion supernatant liquor, food industrial wastewater, herding waste water, wastewater from chemical industry etc.
Apply the above-mentioned sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration and process the method for waste water, comprise following concrete steps:
(1) take nitrifying sludge as seed sludge injection aerobic zone, sbr reactor pond and oxygen-starved area; The first agitator of opening equalizing tank, packs waste water in equalizing tank into;
(2) waste water in equalizing tank pumps into oxygen-starved area, sbr reactor pond by intake pump, opens the second agitator of oxygen-starved area, sbr reactor pond simultaneously, carries out denitrification;
(3) when oxygen-starved area, sbr reactor pond current start overflow to aerobic zone, adopt SBR operation to start aerobic zone, sbr reactor pond, carry out short distance nitration effect:
1. water inlet-aeration (reaction) stage: the mode of taking unlimited aeration-intermittent water inflow to aerobic zone, is opened the current overflow of oxygen-starved area, sbr reactor pond the 3rd agitator and started the reflux pump between aerobic zone, sbr reactor pond and oxygen-starved area; In this process, by the pH meter of aerobic zone, sbr reactor pond, monitor the water inlet of oxygen-starved area, make the pH of aerobic zone, sbr reactor pond maintain 6.5～7.9; DO in aerobic zone, sbr reactor pond maintains ﹥ 1mg/L; Reflux ratio is 3, according to practical situation, can finely tune;
2. follow-up aeration phase: when flooding quantity reaches or higher than liquid level set(ting)value, stops into water but continue aeration;
3. precipitate phase: stop the 3rd agitator after follow-up aeration phase finishes, closing volume pump, precipitates;
4. bleeding stage: use and strain hydrophone and control draining by level sensor monitors;
5. sbr reactor pond enters next circulation: 1., 2., 3. and 4., hydraulic detention time is progressively reduced to 1d from 2d to repeating step;
Described waste water is high ammonia-nitrogen wastewater, NH4 in described high ammonia-nitrogen wastewater
+-N concentration is greater than 500mg/L, BOD
5/ TN is less than 3～5;
Described high ammonia-nitrogen wastewater is preferably changing food waste Digestive system, percolate, sludge digestion supernatant liquor, food industrial wastewater, herding waste water, wastewater from chemical industry;
The temperature of aerobic zone, sbr reactor pond is 30～40 ℃ in step (3), when temperature is lower than 30 ℃, starts the heating installation of equalizing tank, when temperature is during higher than 40 ℃, stops the heating installation of equalizing tank;
In step (3), the temperature of aerobic zone, sbr reactor pond is preferably 35 ℃; When temperature is lower than 35 ℃, start the heating installation of equalizing tank, when temperature is during higher than 35 ℃, stop the heating installation of equalizing tank;
The unlimited aeration of step (3) described in 1. refers to that whole water inlet-aeration (reaction) stage all carries out aeration;
The mode of the intermittent water inflow of step (3) described in is 1. that the pH of aerobic zone, sbr reactor pond maintains 6.5～7.9, when the pH of sbr reactor pond Aerobic Pond is lower than 6.5～7.9, starts the water inlet of sbr reactor pond anoxic pond; When the pH of sbr reactor pond Aerobic Pond is higher than 6.5～7.9, stop the water inlet of oxygen-starved area, sbr reactor pond;
The pH that the mode of the intermittent water inflow of step (3) described in is 1. preferably sbr reactor pond Aerobic Pond maintains 6.8～7.5; When the pH of sbr reactor pond Aerobic Pond is lower than 6.8～7.5, start the water inlet of sbr reactor pond anoxic pond; When the pH of sbr reactor pond Aerobic Pond is higher than 6.8～7.5, stop the water inlet of sbr reactor pond anoxic pond;
Be 30min～3h the working time of the follow-up aeration phase of step (3) described in 2., and concrete reflecting time is depending on concrete; This stage is along with nitrosation reaction finishes, basicity consumption, and pH is down to minimum and stable;
Be 30～60min the working time of the precipitate phase of step (3) described in 3.;
Principle of the present invention:
Generally speaking, the FA in waste water is relevant with temperature and pH in water with FNA, and especially, the concentration of FA becomes positive correlation with the size of pH, and the concentration of FNA becomes with it inverse correlation.Be that pH is less than in 7 situation, in biological treatment of waste water system, more easily form FNA.FA and FNA are the matrix of utilizing in nitrification, are also " inhibition biological agents " simultaneously.Specifically, NOB is more easily subject to the impact of these two kinds of materials than AOB.When FNA concentration is greater than 0.02mg/L, or FA concentration is while being greater than 6mg/L, and the building-up process of NOB stops completely.FNA is 0.42～1.72mg/L to 50% inhibition concentration of AOB.
The invention provides a kind of sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration and process the method for waste water: high ammonia-nitrogen wastewater enters equalizing tank; The waste water of equalizing tank pumps into oxygen-starved area, sbr reactor pond by intake pump and carries out denitrification; The current overflow of sbr reactor pond anoxic pond is to aerobic zone, sbr reactor pond, and interlock is intake; Aerobic zone, sbr reactor pond adopts SBR operation scheme, carries out short distance nitration effect; The fill phase of aerobic zone, sbr reactor pond refluxes simultaneously, and to oxygen-starved area, (reflux ratio is 3 to muddy water, according to practical situation, can finely tune), the follow-up aeration in aerobic zone finishes to stop to reflux, oxygen-starved area water outlet overflow is to aerobic zone, so circulation, the carbon source making full use of in waste water is carried out denitrification in oxygen-starved area, sbr reactor pond.
In order to realize stable nitrosification, must suppress the growth of the NOB of aerobic zone, sbr reactor pond.In a cycle of operation of aerobic zone, sbr reactor pond, the concentration of FNA and FA is respectively 0.2～2.8mg/L and 0.02～1.7mg/L.Wherein, the highest FA concentration 1.7mg/L does not suppress NOB completely; Minimum FNA concentration 0.2mg/L is far longer than the full inhibition concentrations of NOB.Therefore, FNA successfully realizes the key of nitrosification in native system.Every SBR cycle of operation, when starting and finishing, FNA concentration was all greater than 2mg/L, had clearly suppressed the growth of AOB.This is consistent with DO change in concentration trend, shows that AOB is suppressed completely, and nitrification temporarily stops, and DO does not almost consume, so DO suddenly increases (Fig. 4, Fig. 5) when every SBR cycle of operation starts and finishes.
The present invention has following advantage and effect with respect to prior art:
(1) in the startup of whole reactor, in servicely sludge concentration MLSS is not limited;
(2) sequence batch (A/O linked system can effectively be carried out nitrosation reaction, and technological operation flow process is simple, and anti-ammonia nitrogen loading impact capacity is strong;
(3) utilize the pH of fill phase in SBR operational process indirectly to control, by FNA, directly control and realize and maintain stable nitrosification;
(4) adopt PLC Controlling System, move easyly, control accurately;
(5) take full advantage of the organic carbon in former water, reduced the impact of organism on follow-up nitrosification, and start fast and the short distance nitration effect of stable high ammonia-nitrogen wastewater, nitrous rate is up to more than 95%.
Accompanying drawing explanation
Fig. 1 is the structural representation of realizing the sequence batch (A/O linked system wastewater treatment equipment of waste water short distance nitration of the present invention, wherein: 1. equalizing tank; 2.SBR reaction tank oxygen-starved area; 3.SBR reaction tank aerobic zone; 1.1. first liquid under meter; 1.2. intake pump; 1.3. the first agitator; 1.4. heating unit; 2.1. the first pH meter; 2.2.ORP meter; 2.3. the second agitator; 2.4. overflow groove; 3.1 the 3rd agitators; 3.2. the second pH meter; 3.3.DO meter; 3.4. liquid level sensor; 3.5. aeration tube; 3.6. temperature sensor; 3.7. strain hydrophone; 3.8. gas meter; 3.9. aerator; 3.10. reflux pump; 3.11. reflux line; 3.12. second liquid under meter.
Fig. 2 is the PLC on-line Control explanatory view of realizing the sequence batch (A/O linked system wastewater treatment equipment of waste water short distance nitration of the present invention.
Fig. 3 is the PLC on-line Control schema of realizing the sequence batch (A/O linked system wastewater treatment equipment of waste water short distance nitration of the present invention.
Fig. 4 is pH and the DO changing trend diagram in one cycle of aerobic zone, sbr reactor pond during system stable operation in embodiment 2.
Fig. 5 is FNA and the FA changing trend diagram in one cycle of aerobic zone, sbr reactor pond during system stable operation in embodiment 2.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1
As shown in Figure 1, a kind of sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration, is provided with equalizing tank 1 and sbr reactor pond 2,3, and described sbr reactor pond 2,3 comprises oxygen-starved area, sbr reactor pond 2 and aerobic zone, sbr reactor pond 3;
Described equalizing tank 1 is communicated with oxygen-starved area, sbr reactor pond 2 by intake pump 1.2 and first liquid under meter 1.1 successively;
Described oxygen-starved area, sbr reactor pond 2 is communicated with aerobic zone, sbr reactor pond 3 by overflow groove 2.4;
Described aerobic zone, sbr reactor pond 3 inner bottom parts are provided with aeration tube 3.5, and described aeration tube 3.5 is connected with aerator 3.9 by gas meter 3.8;
Described 3 inside, aerobic zone, sbr reactor pond are provided with strains hydrophone 3.7;
Described 3 bottoms, aerobic zone, sbr reactor pond are communicated with reflux pump 3.10 and second liquid under meter 3.12 and 2 bottoms, oxygen-starved area, sbr reactor pond successively by reflux line 3.11;
Described equalizing tank 1 inside is provided with the first agitator 1.3 and heating unit 1.4;
Described oxygen-starved area, sbr reactor pond 2 and the volume ratio of aerobic zone, sbr reactor pond 3 are 1:(3～5);
Described 2 inside, oxygen-starved area, sbr reactor pond are provided with the second agitator 2.3, the first pH meter 2.1 and ORP meter 2.2;
Described 3 inside, aerobic zone, sbr reactor pond are provided with the 3rd agitator 3.1, the second pH meter 3.2, DO meter 3.3, liquid level sensor 3.4 and temperature sensor 3.6;
As shown in Figure 2, the first described pH meter 2.1, the second pH meter 3.2, DO meter 3.3, ORP meter 2.2, temperature sensor 3.6, first liquid under meter 1.1, second liquid under meter 3.12, liquid level sensor 3.4, gas meter 3.8 are connected with PLC controller respectively;
Described PLC controller is connected with computer, by computer receiving digital signals and export control signal; Described PLC controller respectively with intake pump 1.2, aerator 3.9, the first agitator 1.3, the second agitator 2.3, the 3rd agitator 3.1, heating unit 1.4, strain hydrophone 3.7, reflux pump 3.10 is connected.
Apply the above-mentioned sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration and process the method (Fig. 3) of waste water, comprise following concrete steps:
(1) take nitrifying sludge as seed sludge injection aerobic zone 3, sbr reactor pond and oxygen-starved area 2; The first agitator 1.3 of opening equalizing tank 1, packs waste water in equalizing tank 1 into;
(2) waste water in equalizing tank 1 pumps into oxygen-starved area, sbr reactor pond 2 by intake pump 1.2, opens the second agitator 2.3 of oxygen-starved area, sbr reactor pond 2 simultaneously, carries out denitrification;
(3) when oxygen-starved area, sbr reactor pond 2 current start overflow to aerobic zone 3, adopt SBR operation to start aerobic zone, sbr reactor pond 3, carry out short distance nitration effect:
1. water inlet-aeration (reaction) stage: the mode of taking unlimited aeration-intermittent water inflow by oxygen-starved area, sbr reactor pond 2 current by overflow groove 2.4 overflows to aerobic zone 3, open the 3rd agitator 3.1 and start the reflux pump 3.10 between aerobic zone 3, sbr reactor pond and oxygen-starved area 2; In this process, by the second pH meter 3.2 of aerobic zone, sbr reactor pond 3, monitor the water inlet of oxygen-starved areas 2, make the pH of sbr reactor pond Aerobic Pond 3 maintain 6.5～7.9; DO in aerobic zone, sbr reactor pond 3 maintains ﹥ 1mg/L; Reflux ratio is 3, according to practical situation, can finely tune;
2. follow-up aeration phase: when flooding quantity reaches or higher than liquid level set(ting)value, stops into water but continue aeration;
3. precipitate phase: stop the 3rd agitator 3.1 after follow-up aeration phase finishes, closing volume pump 3.10, precipitates;
4. bleeding stage: use and strain hydrophone 3.7 and control drainings by liquid level sensor 3.4 monitoring;
5. sbr reactor pond enters next circulation: 1., 2., 3. and 4., hydraulic detention time is progressively reduced to 1d from 2d to repeating step;
Described waste water is high ammonia-nitrogen wastewater, NH4 in described high ammonia-nitrogen wastewater
+-N concentration is greater than 500mg/L, BOD
5/ TN is less than 3～5;
Described high ammonia-nitrogen wastewater is preferably changing food waste Digestive system, percolate, sludge digestion supernatant liquor, food industrial wastewater, herding waste water, wastewater from chemical industry;
The temperature of aerobic zone, sbr reactor pond 3 is 30～40 ℃ in step (3), when temperature is lower than 30 ℃, starts the heating installation 1.4 of equalizing tank, when temperature is during higher than 40 ℃, stops the heating installation of equalizing tank;
In step (3), the temperature of aerobic zone, sbr reactor pond 3 is preferably 35 ℃; When temperature is lower than 35 ℃, start the heating installation 1.4 of equalizing tank, when temperature is during higher than 35 ℃, stop the heating installation of equalizing tank;
The unlimited aeration of step (3) described in 1. refers to that whole water inlet-aeration (reaction) stage all carries out aeration;
The mode of the intermittent water inflow of step (3) described in is 1. that the pH of aerobic zone, sbr reactor pond maintains 6.5～7.9, when the pH of aerobic zone, sbr reactor pond is lower than 6.5～7.9, starts the water inlet of oxygen-starved area, sbr reactor pond; When the pH of sbr reactor pond Aerobic Pond is higher than 6.5～7.9, stop the water inlet of oxygen-starved area, sbr reactor pond;
The pH that the mode of the intermittent water inflow of step (3) described in is 1. preferably aerobic zone, sbr reactor pond maintains 6.8～7.5; When the pH of sbr reactor pond Aerobic Pond is lower than 6.8～7.5, start the water inlet of oxygen-starved area, sbr reactor pond; When the pH of aerobic zone, sbr reactor pond is higher than 6.8～7.5, stop the water inlet of oxygen-starved area, sbr reactor pond;
Be 30min～3h the working time of the follow-up aeration phase of step (3) described in 2., and concrete reflecting time is depending on concrete; This stage is along with nitrosation reaction finishes, basicity consumption, and pH is down to minimum and stable;
Be 30～60min the working time of the precipitate phase of step (3) described in 3..
Embodiment 2
Adopt sequence batch (A/O linked system wastewater treatment equipment and the disposal methods waste water of realizing waste water short distance nitration of the present invention, wherein equalizing tank is of a size of B * H * L=470 * 500 * 440cm, and cubic capacity is 103,400L.Oxygen-starved area, sbr reactor pond is of a size of 470 * 500 * 440cm, useful volume 100,000L; Aerobic zone is of a size of 470 * 500 * 1540cm, and useful volume is 350000L.
Get the percolate of Xiaping Solid Waste Dumping Ground, Shenzhen City, its pH is 8.01～8.65, NH
4 +-N concentration is up to 1500～3000mg/L, BOD
5/ TN is less than 3～5, is typical high-concentration ammonia-nitrogen low ratio of carbon to ammonium waste water.
(1) take the nitrifying sludge of Shenzhen Xia Ping percolate treatment plant is that seed sludge injects aerobic zone, sbr reactor pond and oxygen-starved area, and sludge concentration is 2500kg MLSS/m
3; The first agitator (300 turn/h) of opening equalizing tank, packs percolate in equalizing tank into;
(2) waste water in equalizing tank pumps into oxygen-starved area, sbr reactor pond by intake pump, opens second agitator (300 turn/h) of oxygen-starved area, sbr reactor pond simultaneously, carries out denitrification;
(3) when overflow oxygen-starved area, sbr reactor pond, adopt SBR operation to start aerobic zone, sbr reactor pond, carry out short distance nitration effect:
1. water inlet-aeration (reaction) stage: the mode of taking unlimited aeration-intermittent water inflow to aerobic zone, is opened the current overflow of oxygen-starved area, sbr reactor pond the 3rd agitator (300 turn/h) and started the reflux pump (reflux ratio is 3) between aerobic zone, sbr reactor pond and oxygen-starved area; In this process, the water inlet of the pH meter monitoring oxygen-starved area by sbr reactor device aerobic zone: when the pH of aerobic zone, sbr reactor pond is lower than 6.8～7.5, start the water inlet of oxygen-starved area, sbr reactor pond, when the pH of aerobic zone, sbr reactor pond is higher than 6.8～7.5, stop the water inlet of oxygen-starved area, sbr reactor pond; The temperature of aerobic zone, sbr reactor pond is 30～35 ℃, when temperature is lower than 30 ℃, starts the heating installation of equalizing tank, when temperature is during higher than 35 ℃, stops the heating installation of equalizing tank; Intrasystem DO maintains ﹥ 1mg/L;
2. follow-up aeration phase: when flooding quantity reaches or during higher than liquid level set(ting)value, stops into water but continue aeration; This stage is along with nitrosation reaction finishes, basicity consumption, and pH is down to minimum and is stabilized to 2, and the time is 1h;
3. precipitate phase: stop the 3rd agitator after follow-up aeration phase finishes, closing volume pump, precipitates, and the time is 30min;
4. bleeding stage, is used and is strained hydrophone control draining by level sensor monitors;
5. sbr reactor pond enters next circulation: 1., 2., 3. and 4., hydraulic detention time is progressively reduced to 1d from 2d to repeating step.
The pH in one cycle of aerobic zone, sbr reactor pond and DO changing trend diagram when Fig. 4 is the present embodiment system stable operation, the FNA in one cycle of aerobic zone, sbr reactor pond and FA changing trend diagram when Fig. 5 is the present embodiment system stable operation.As can be seen from the figure,, in a cycle of operation of aerobic zone, sbr reactor pond, the concentration of FNA and FA is respectively 0.2～2.8mg/L and 0.02～1.7mg/L.Wherein, the highest FA concentration 1.7mg/L does not suppress NOB completely; Minimum FNA concentration 0.2mg/L is far longer than the full inhibition concentrations of NOB.Therefore, FNA successfully realizes the key of nitrosification in native system.Every SBR cycle of operation, when starting and finishing, FNA concentration was all greater than 2mg/L, had clearly suppressed the growth of AOB.This is consistent with DO change in concentration trend, shows that AOB is suppressed completely, and nitrification temporarily stops, and DO does not almost consume, so DO suddenly increases when every SBR cycle of operation starts and finishes.
System operation is after 1 month, and operating performance is stable, and experimental result shows: aerobic zone, sbr reactor pond water inlet NH
4 +-N load ALR is up to 3kg NH
4 +-N/m
3d, NO
2--N accumulation rate is up to more than 95%.The concrete Inlet and outlet water water quality of this system is as shown in table 1:
Table 1 is realized the sequence batch (A/O linked system wastewater treatment equipment Inlet and outlet water water quality parameter comparison of waste water short distance nitration
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (10)
1. a sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration, is characterized in that: be provided with equalizing tank, sbr reactor pond, described sbr reactor pond comprises oxygen-starved area, sbr reactor pond and aerobic zone, sbr reactor pond;
Described equalizing tank is communicated with oxygen-starved area, sbr reactor pond by intake pump and first liquid under meter successively;
Described oxygen-starved area, sbr reactor pond is communicated with aerobic zone, sbr reactor pond by overflow groove;
Described aerobic zone, sbr reactor pond inner bottom part is provided with aeration tube, and described aeration tube is connected with aerator by gas meter;
Described inside, aerobic zone, sbr reactor pond is provided with strains hydrophone;
Bottom, described aerobic zone, sbr reactor pond is communicated with reflux pump and second liquid under meter and bottom, oxygen-starved area, sbr reactor pond successively by reflux line.
2. the sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration according to claim 1, is characterized in that:
Described equalizing tank inside is provided with the first agitator and heating unit.
3. the sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration according to claim 1, is characterized in that:
Described inside, oxygen-starved area, sbr reactor pond is provided with the second agitator, the first pH meter and ORP meter.
4. the sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration according to claim 1, is characterized in that:
Described inside, aerobic zone, sbr reactor pond is provided with the 3rd agitator, the second pH meter, DO meter, liquid level sensor and temperature sensor.
5. the sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration according to claim 1, is characterized in that:
The volume ratio of described oxygen-starved area, sbr reactor pond and aerobic zone, sbr reactor pond is 1:(3～5).
6. according to the sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration described in claim 2～4 any one, it is characterized in that:
The first described pH meter, the second pH meter, DO meter, ORP meter, temperature sensor, first liquid under meter, second liquid under meter, liquid level sensor, gas meter are connected with PLC controller respectively;
Described PLC controller with by computer receiving digital signals the computer of exporting control signal, be connected; Described PLC controller respectively with intake pump, aerator, the first agitator, the second agitator, the 3rd agitator, heating unit, strain hydrophone, reflux pump is connected.
7. the sequence batch (A/O linked system wastewater treatment equipment of realizing waste water short distance nitration described in application rights requirement 1～6 any one is processed the method for waste water, it is characterized in that comprising following concrete steps:
(1) take nitrifying sludge as seed sludge injection aerobic zone, sbr reactor pond and oxygen-starved area; The first agitator of opening equalizing tank, packs waste water in equalizing tank into;
(2) waste water in equalizing tank pumps into oxygen-starved area, sbr reactor pond by intake pump, opens the second agitator of oxygen-starved area, sbr reactor pond simultaneously, carries out denitrification;
(3) when oxygen-starved area, sbr reactor pond current start overflow to aerobic zone, adopt SBR operation to start aerobic zone, sbr reactor pond, carry out short distance nitration effect:
1. water inlet-aeration phase: the mode of taking unlimited aeration-intermittent water inflow to aerobic zone, is opened the current overflow of oxygen-starved area, sbr reactor pond the 3rd agitator and started the reflux pump between aerobic zone, sbr reactor pond and oxygen-starved area; In this process, by the pH meter of aerobic zone, sbr reactor pond, monitor the water inlet of oxygen-starved area, make the pH of aerobic zone, sbr reactor pond maintain 6.5～7.9; DO in aerobic zone, sbr reactor pond maintains ﹥ 1mg/L, and reflux ratio is 3～5;
2. follow-up aeration phase: when flooding quantity reaches or higher than liquid level set(ting)value, stops into water but continue aeration;
3. precipitate phase: stop the 3rd agitator after follow-up aeration phase finishes, closing volume pump, precipitates;
4. bleeding stage: use and strain hydrophone and control draining by level sensor monitors;
5. sbr reactor pond enters next circulation: 1., 2., 3. and 4., hydraulic detention time is progressively reduced to 1d from 2d to repeating step.
8. application according to claim 7 realizes the method for the sequence batch (A/O linked system wastewater treatment equipment processing waste water of waste water short distance nitration, it is characterized in that:
In step (3), the temperature of aerobic zone, sbr reactor pond is 30～40 ℃; When temperature is lower than 30 ℃, start the heating installation of equalizing tank, when temperature is during higher than 40 ℃, stop the heating installation of equalizing tank.
9. application according to claim 7 realizes the method for the sequence batch (A/O linked system wastewater treatment equipment processing waste water of waste water short distance nitration, it is characterized in that:
The unlimited aeration of step (3) described in 1. refers to that whole water inlet-aeration phase all carries out aeration;
The mode of the intermittent water inflow of step (3) described in is 1. that the pH of aerobic zone, sbr reactor pond maintains 6.5～7.9, when the pH of aerobic zone, sbr reactor pond is lower than 6.5～7.9, starts the water inlet of oxygen-starved area, sbr reactor pond; When the pH of aerobic zone, sbr reactor pond is higher than 6.5～7.9, stop the water inlet of oxygen-starved area, sbr reactor pond.
10. application according to claim 7 realizes the method for the sequence batch (A/O linked system wastewater treatment equipment processing waste water of waste water short distance nitration, it is characterized in that:
Be 30min～3h the working time of the follow-up aeration phase of step (3) described in 2.;
Be 30～60min the working time of the precipitate phase of step (3) described in 3..
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| CN109626759A (en) * | 2019-01-30 | 2019-04-16 | 河海大学 | A kind of circulating the ecology pond systems of full section and method handling agriculture stain disease |
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