CN108275780A - The nitrogenous petrochemical wastewater processing unit of novel height and the method for parameter adjustment - Google Patents
The nitrogenous petrochemical wastewater processing unit of novel height and the method for parameter adjustment Download PDFInfo
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- CN108275780A CN108275780A CN201810240216.3A CN201810240216A CN108275780A CN 108275780 A CN108275780 A CN 108275780A CN 201810240216 A CN201810240216 A CN 201810240216A CN 108275780 A CN108275780 A CN 108275780A
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The present invention provides a kind of novel nitrogenous petrochemical wastewater processing unit of height, including anaerobic pond, heterotrophic denitrification pond, the first sedimentation basin, denitrification of autotrophic organism pond and the second sedimentation basin sequentially connected.A kind of method carrying out parameter adjustment using novel petrochemical wastewater treatment equipment is provided simultaneously.Advantageous effect is 80% 95% toxic organics difficult to degrade removed by anaerobic pond and heterotrophic denitrification pond in raw water；The nitrate nitrogen that 80% 90% denitrification of autotrophic organism ponds generate can remove by heterotrophic denitrification pond simultaneously；It can remove in raw water 95% 99% ammonia nitrogen by denitrification of autotrophic organism pond；90% 97% total nitrogen can be removed in raw water by the present apparatus, nitrogen volume elimination capacity rate can reach 2.5 10kg/ (m3·d).High nitrogenous petrochemical wastewater effluent quality after device proposed by the present invention processing can reach《Petro chemical industry pollutant emission standard》Direct emission standard in (GB 31,571 2015).
Description
Technical field
The present invention is suitable for field of biological sewage treatment, and in particular to a kind of nitrogenous petrochemical wastewater processing unit of novel height and
The method of parameter adjustment.
Background technology
As China's oil chemical enterprise is continuously increased, the petrochemical wastewater generated also constantly increases.Petroleum chemical enterprise produces
Raw petrochemical wastewater has the characteristics that high ammonia nitrogen and high toxic organics difficult to degrade, if not handling it can cause
Serious water pollution, high ammonia nitrogen especially therein and toxic organics difficult to degrade have serious pollution to water body,
It is a kind of than sewage difficult to deal with.
Traditional petrochemical wastewater is handled is with the processing of the physical methods such as coagulating sedimentation and absorption and traditional Aerobic biological process
Main, although these methods can remove inorganic ions and organic matter etc., the processing of wherein high ammonia nitrogen needs to add additionally
Carbon source, to cause high processing cost.Additionally due to contain toxic organics difficult to degrade in waste water, it can be to aerobic dirt
Mud, which is formed, to be inhibited, relatively low so as to cause the treatment effeciency of petrochemical wastewater.It is core from health using short distance nitration-anaerobic ammoxidation
Object denitrification process is compared with traditional aerobic biological treatment process, and denitrification of autotrophic organism technique is not necessarily to additional carbon, and oxygen demand is low, can
Significantly reduce operating cost；Sludge yield is few, avoids secondary pollution.Denitrification of autotrophic organism technique can pass through anaerobic ammonia oxidizing bacteria
Ammonia nitrogen and nitrite nitrogen are directly converted to nitrogen, has compared with aerobic nitrification/anoxic denitrification technique and saves carbon source
100%, the advantage low with sludge yield of aeration energy consumption 60% is reduced.
In existing denitrification of autotrophic organism device, the split type denitrification of autotrophic organism device of generally use, split type autotrophy
Biological denitrification apparatus needs to be provided separately short distance nitration pond and anaerobic ammonium oxidation tank, further needs exist for setting sludge recirculation system,
But the expense that the increase of these equipment results in whole service increases；Existing denitrification of autotrophic organism device is de- to autotroph
The bioaccumulation efficiency of nitrogen sludge is not high, causes the sludge concentration in denitrification of autotrophic organism device low, so as to cause entire autotroph
The treatment effeciency of nitrogen rejection facility is low, and water outlet is extremely difficult to the Water-quality control standard of country；Simultaneously because in petrochemical wastewater usually
Toxic organics difficult to degrade containing higher concentration, such as benzene-like compounds, these organic matters can cause autotroph de-
The denitrification ability of nitrogen device is significantly inhibited；Nitrate nitrogen is generated in denitrification of autotrophic organism device, according to autotroph
The reaction equation of denitrogenation, denitrification of autotrophic organism device can only achieve 88.7% to the highest theory removal rate of Determination of Total Nitrogen in Waste Water, to
Denitrification of autotrophic organism device is caused to there are problems that being discharged total nitrogen concentration is difficult to qualified discharge；In addition denitrification of autotrophic organism device lacks
Weary effective early warning system, cause denitrification of autotrophic organism device when i.e. by unstability can not timely early warning, seriously affect autotroph
Nitrogen rejection facility stablizes effectively operation.
In conclusion using the master for needing to solve when denitrification of autotrophic organism technical finesse for high nitrogenous petrochemical wastewater at present
The problem is wanted to include：How to reduce toxic organics difficult to degrade on autotrophic denitrification biology content and it is active influence, how to solve
Denitrification of autotrophic organism sludge concentration certainly in denitrification of autotrophic organism device is low, how to ensure denitrification of autotrophic organism device stablizes fortune
Row, how to avoid denitrification of autotrophic organism device be discharged in nitrate content is exceeded, how to reduce the fortune of denitrification of autotrophic organism technique
Row cost.How the defect of existing these technologies to be overcome, it has also become the art needs the project studied and solved.
Invention content
The invention mainly solves the technical problem of providing a kind of novel petrochemical wastewater treatment equipment and the sides of parameter adjustment
Method, solve petrochemical wastewater in toxic organics difficult to degrade on autotrophic denitrification biology content and active influence, autotroph
Denitrifying sludge concentration is low, denitrification of autotrophic organism technique operating cost is high, denitrification of autotrophic organism device fluctuation of service and water outlet
The underproof problem of index of total nitrogen.
In order to solve the above technical problems, the technical solution adopted by the present invention is to provide a kind of novel petrochemical wastewater treatment dress
It sets, including the anti-digester of sequentially connected anaerobic pond, heterotrophism, the first sedimentation basin, denitrification of autotrophic organism pond, the second sedimentation basin.
A kind of method carrying out parameter adjustment using novel petrochemical wastewater treatment equipment is provided simultaneously.
The present invention effect be：
(1) in anaerobic pond, the toxic organics difficult to degrade of degradation 90%-95% are acted on by anaerobic hydrolysis, together
When by methane backeria act on removal raw water in 70%-80% organic matter.It may be implemented difficult to degrade to have by Anaerobic Treatment effect
The degradation of malicious harmful organic substance and resource reclaim, while reducing operating cost.
(2) in heterotrophic denitrification pond, nitrate nitrogen and organic matter are mainly removed.In the effect of heterotrophic denitrification bacterium
Under, denitrification is carried out using the nitrate nitrogen in the organic matter and denitrification of autotrophic organism pond recycling effluent in water inlet, nitrate
Nitrogen becomes nitrogen, while removing the organic matter in water inlet, to reduce the organic matter for entering denitrification of autotrophic organism pond.By different
The organic matter of the 80%-90% in the removal heterotrophic denitrification pond water inlet of denitrification pond is supported, while removing 80%-90% autotrophs
The nitrate nitrogen that denitrification tank generates.By the fixed bio-carrier of addition, the sludge concentration in heterotrophic denitrification pond is kept
10000mg/L or more.
(3) first sedimentation basins are separated by solid-liquid separation by the water mixed liquid that goes out to heterotrophic denitrification pond, by what is precipitated
Sludge is returned to heterotrophic denitrification pond.The water mixed liquid that goes out in heterotrophic denitrification pond is separated by solid-liquid separation by the first sedimentation basin,
It is discharged concentration of suspension≤70mg/L.
(4) in denitrification of autotrophic organism pond, by adding suspended biological carrier in denitrification of autotrophic organism pond, using modification
Raschig ring carrier can provide a space parallax, to the autotrophy to different function using modified Raschig ring carrier for microorganism
Denitrification microorganism provides respectively suitable ecological niche respectively：Short distance nitration bacterium grows in the aerobic zone of the outside of carrier, anaerobism ammonia
Oxidation bacteria is grown in the anoxic zone inside carrier.Dissolved oxygen in external short distance nitration bacterium is using water body is in water inlet
About 50% ammonium oxidation is generated in the anaerobic ammonia oxidizing bacteria of carrier inside using short distance nitration bacterium later at nitrite nitrogen
Nitrite nitrogen and remaining ammonia nitrogen carry out effect and generate nitrogen, to the ammonia nitrogen removal in sewage.The life that suspends is utilized simultaneously
The effect of object carrier device for trapping was enriched with denitrification of autotrophic organism sludge in 3-5 months, and in denitrification of autotrophic organism
Denitrification of autotrophic organism sludge concentration in pond is maintained at 10000mg/L or more；Simultaneously because difficult to degrade poisonous and harmful in raw water
The removal of organic matter, to reduce the influence to denitrification of autotrophic organism sludge, the total nitrogen in denitrification of autotrophic organism pond handles load
Reach 2.7-7.2kg/ (m3D), the removal rate of the ammonia nitrogen in water inlet reaches 95%-99%.
(5) second sedimentation basins are separated by solid-liquid separation by the water mixed liquid that goes out to denitrification of autotrophic organism pond, will be precipitated
Sludge denitrification of autotrophic organism pond is returned to by suspended biological carrier device for trapping.It is de- to autotroph by the second sedimentation basin
The water mixed liquid that goes out in nitrogen pond is separated by solid-liquid separation, and concentration of suspension≤50mg/L is discharged.
(6) it is flowed by overflow type between first sedimentation basin and denitrification of autotrophic organism pond, heterotrophic denitrification pond
It is all made of Round Sump with the first sedimentation basin, denitrification of autotrophic organism pond and the second sedimentation basin, saves sludge reflux pump and pipeline, is reduced
Hydraulic loss, to reducing the operating cost of 20%-30%.
(7) in the denitrification of autotrophic organism pond, by controlling the dissolved oxygen in denitrification of autotrophic organism pond in 0.3-1mg/
L, temperature 30-35 DEG C, effluent recycling ratio 0.5-10, free ammonia and free nitrous acid concentration respectively in 1-25mg/L and 5-20
The concentration rate of changing with time of μ g/L, free nitrous acid and free ammonia are respectively smaller than 20 μ g/ (Ld) and 25mg/ (Ld),
When the above parameter is more than variation range, robot control system(RCS) gives a warning to carry out early warning, to regulate and control to these parameters,
These parameters are controlled in control range, to ensure the stable operation in denitrification of autotrophic organism pond, ensure that effluent quality reaches《Stone
Oiling emission of industrial pollutants standard》Direct emission standard in (GB 31571-2015).
Description of the drawings
Fig. 1 is the wastewater treatment single unit system structural schematic diagram of the present invention.
In figure：
1, anaerobic pond 2, heterotrophic denitrification pond 3, the first sedimentation basin 4, denitrification of autotrophic organism pond 5, the second sedimentation basin
11, intake pump 12, anaerobic pond water inlet pipe 13, anaerobic pond holder 14, anaerobic pond reaction zone 15, three phase separator 16, gas
Collecting pipe 17, constent temperature heater 18, constant temperature water bath water inlet 19, constant temperature water bath 110, outlet pipe 111, thermostatted water
Bath water outlet 112, fixed bio-carrier 113, sludge pipe 114, collection chamber 115, constant temperature water bath outer wall 21, water inlet
Pump 22, fixed bio-carrier 23, stirring motor 24, heterotrophic denitrification pond up-flow area 25, the areas heterotrophic denitrification Chi Jiangliu
26, heating rod 27, deflector 28, sludge reflux seam 29, agitating device 210, agitating paddle 211, effluent recycling water inlet pipe
212, heterotrophic denitrification pond combined type on-line detector 31, spout hole 32,41 denitrification of autotrophic organism pond up-flow area of sludge pipe
42, the areas denitrification of autotrophic organism Chi Jiangliu 43, suspended biological carrier 44, deflector 45, aerator 46, sludge gravity flow area
47, PLC controller 48, air blower 49, denitrification of autotrophic organism pond combined type on-line detector 51, suspended biological carrier retention
Device 52, outlet pipe 53, effluent recycling pipe 54, sludge pipe 55, effluent recycling pump
Specific implementation mode
The method of the high nitrogenous petrochemical wastewater processing unit of the utility model and parameter adjustment is illustrated in conjunction with attached drawing.
As shown in Figure 1, the nitrogenous petrochemical wastewater processing unit structure of novel height of the present invention is by sequentially connecting anaerobic pond 1,
Heterotrophic denitrification pond 2, the first sedimentation basin 3, denitrification of autotrophic organism pond 4 and the second sedimentation basin 5 composition.
The anaerobic pond water inlet pipe 12 of the anaerobic pond 1 is connect by pipeline with intake pump 11, and anaerobic pond water inlet pipe 12 passes through
Flange is connect with anaerobic pond reaction zone 14, and anaerobic pond reaction zone 14 is connect by flange with three phase separator 15 later, anaerobic pond 1
Outlet pipe 110 connect with intake pump 21 by pipeline；Anaerobic pond 1 is equipped with constant-temperature heating system：Anaerobic pond reaction zone 14 with
Constant temperature water bath 19, constant temperature water bath water inlet pipe 18, the thermostatted water of constant temperature water bath 19 are equipped between constant temperature water bath outer wall 115
Bath outlet pipe 111 is connect with constent temperature heater 17 respectively by pipeline, is filled in the anaerobic pond reaction zone 14 of anaerobic pond 1
Fixed bio-carrier 112；The bottom of the anaerobic pond reaction zone 14 of anaerobic pond 1 is equipped with sludge pipe 113；Simultaneously the three of anaerobic pond 1
The top of phase separator 15 is equipped with the collection chamber 114 with gas-collecting pipe 16.
It is internally provided with deflector 27 in the heterotrophic denitrification pond 2,27 side of deflector flows up for heterotrophic denitrification pond
Area 24, the other side are the areas heterotrophic denitrification Chi Jiangliu 25, and the heterotrophic nitrification pond up-flow area 24 is connected by pipeline and intake pump 21
It connects, 25 lower part of the areas the heterotrophic denitrification Chi Jiangliu is equipped with sludge reflux seam 28 and is connect with the first sedimentation basin 3；In the anti-nitre of heterotrophism
Change in pond 2 filled with fixed bio-carrier 22；It is equipped with agitating device 29 in the bottom in heterotrophic denitrification pond 2 and passes through agitating paddle
210 are located at 24 liquid level of heterotrophic denitrification pond up-flow area or less and are connect with PLC controller 47 with stirring motor 23, heating rod 26；
Heterotrophic denitrification pond 2 is additionally provided with heterotrophic denitrification pond combined type on-line detector 212 and is connect with PLC controller 47, PLC controls
Device 47 is connected with denitrification of autotrophic organism pond combined type on-line detector 49, air blower 48 and effluent recycling pump 55 respectively by pipeline
It connects；The effluent recycling water inlet pipe 211 in heterotrophic denitrification pond 2 is connect by pipeline with effluent recycling pump 55.
First sedimentation basin 3 is connect by sludge reflux seam 28 with heterotrophic denitrification pond 2, and the first sedimentation basin 3 is by upper
The spout hole 31 in portion is connect with denitrification of autotrophic organism pond 4.
The denitrification of autotrophic organism pond 4 is connect by spout hole 31 with the first sedimentation basin 3, denitrification of autotrophic organism pond 4 it is interior
Portion is equipped with deflector 44, the denitrification of autotrophic organism pond up-flow area 41 of 44 side of deflector, the denitrification of autotrophic organism pond drop of the other side
Flow area 42, the sludge gravity flow area 46 and second that the denitrification of autotrophic organism pond 4 passes through 42 lower part of the areas denitrification of autotrophic organism Chi Jiangliu
Sedimentation basin 5 is connected to；Be filled with suspended biological carrier 43 in denitrification of autotrophic organism pond 4, at the same denitrification of autotrophic organism pond 4 from health
Suspended biological carrier device for trapping 51 is equipped between the areas 42 object denitrification tank Jiang Liu and the second sedimentation basin 5；In denitrification of autotrophic organism pond 4
Equipped with aerator 45, aerator 45 is connected with air blower 48 by pipeline, and air blower 48 is simultaneously connect with PLC controller 47；
Denitrification of autotrophic organism pond 4 is equipped with denitrification of autotrophic organism pond combined type on-line detector 49 and is connect with PLC controller 47, PLC controls
Device 47 processed by pipeline respectively with denitrification of autotrophic organism pond combined type on-line detector 49, heating rod 26, air blower 48 and water outlet
Reflux pump 55 connects.
The water outlet of second sedimentation basin 5 is discharged by the outlet pipe 52 on top, and the water outlet of the second sedimentation basin 5 is divided into two
Road：It is discharged all the way by outlet pipe 52, another way is connect by effluent recycling pipe 53 with effluent recycling pump 55, is flowed back by pipeline
To heterotrophic denitrification pond 2, while effluent recycling pump 55 is connect with PLC controller 47.
The suspended biological carrier 43 is modified Raschig ring carrier, and modified Raschig ring carrier dimensions are diameter × height × wall thickness
=D × H × W=1-10cm × 1-10cm × 2-5mm, suspended biological carrier 43 add the 10%-30% that rate is volume ratio.
Mixed liquor in the heterotrophic denitrification pond 2 is by agitating device 29 from the bottom in heterotrophic denitrification pond up-flow area 24
24 top of heterotrophic denitrification pond up-flow area is risen to, is entered from the areas heterotrophic denitrification Chi Jiangliu by 27 top overflow of deflector
25,25 lower part of the areas denitrification of autotrophic organism Chi Jiangliu is flowed down to from 25 top of the areas denitrification of autotrophic organism Chi Jiangliu, passes through water conservancy diversion
27 lower part of plate reenters in heterotrophic denitrification pond up-flow area 25, forms internal circulation system.
Mixed liquor and suspended biological carrier 43 in the denitrification of autotrophic organism pond 4 are by aerator 45 from autotroph
The bottom in denitrification tank up-flow area 41 rises to 41 top of denitrification of autotrophic organism pond up-flow area, is entered by 44 top overflow of deflector
Behind the areas denitrification of autotrophic organism Chi Jiangliu 42, denitrification of autotrophic organism pond is flowed down to from 42 top of the areas denitrification of autotrophic organism Chi Jiangliu
The sludge gravity flow area 46 of 42 lower part of the areas Jiang Liu, reenters denitrification of autotrophic organism pond up-flow area 41, in denitrification of autotrophic organism later
Internal circulation system is formed in pond 4.
The PLC controller 47 is the expansible PLC controller of GCAN-PLC-400 types, and early warning is equipped in PLC controller 47
Module and data analysis module.
The fixed bio-carrier 112 is suspension ball-type carrier, and carrier dimensions are a diameter of 1-10cm, and carrier passes through rope yarn
It is fixed in anaerobic pond reaction zone 14, adds the 10%-30% that rate is volume ratio.
The method that the nitrogenous petrochemical wastewater processing unit of novel height of the present invention carries out parameter adjustment, this method are described new
In the high nitrogenous petrochemical wastewater processing unit of type, heterotrophic denitrification is detected by heterotrophic denitrification pond combined type on-line detector 212
The parameters such as temperature, nitrate nitrogen concentration, nitrate nitrogen concentration, pH and ammonia nitrogen concentration in pond 2；Pass through denitrification of autotrophic organism pond group
Box-like on-line detector 49 detects temperature, dissolved oxygen concentration, nitrate nitrogen concentration, pH and the ammonia nitrogen in denitrification of autotrophic organism pond 4
The parameters such as concentration, the data analysis module in PLC controller 47 is to coming from denitrification of autotrophic organism pond combined type on-line detector 49
It is analyzed with the data of heterotrophic denitrification pond combined type on-line detector 212, it is free in denitrification of autotrophic organism pond 4 to detect
The concentration of the concentration of ammonia and free nitrous acid, the free ammonia in denitrification of autotrophic organism pond 4 and free nitrous acid changes with time
The ratio of nitrate nitrogen concentration and influent ammonium concentration in rate, denitrification of autotrophic organism pond 4, heterotrophic denitrification pond 2 and from health
Temperature in object denitrification tank 4, these parameters with the standard parameter in the data analysis module in PLC controller 47 by being compared
Right, when these parameters are more than variation range, the warning module in PLC controller 47 gives a warning, and to denitrification of autotrophic organism
Pond 5 is adjusted according to the following steps：
1, in the denitrification of autotrophic organism pond 4, when the temperature in denitrification of autotrophic organism pond 4 is less than 30 DEG C or higher than 35
DEG C when, PLC controller 47 issues warning signal, PLC controller 47 pass through control heating rod 26 regulate and control heterotrophic denitrification pond 2 and from
Temperature in health object denitrification tank 4 is at 30-35 DEG C.
2, in the denitrification of autotrophic organism pond 4, the concentration of free ammonia and free nitrous acid in denitrification of autotrophic organism pond 4
Control threshold range is respectively 15-25mg/L and 15-20 μ g/L, when the concentration of free ammonia and free nitrous acid is more than control threshold
When, PLC controller 47 issues warning signal, and the pH adjusted at this time during denitrification of autotrophic organism pond 4 intakes is low in 7-8 and ammonia nitrogen concentration
In 500mg/L, the free ammonia in denitrification of autotrophic organism pond 4 and free nitrous acid concentration is made to be controlled respectively in 1-25mg/L and 5-20
μg/L。
3, in the denitrification of autotrophic organism pond 4, the concentration of free ammonia and free nitrous acid in denitrification of autotrophic organism pond 4
It is when the concentration of free nitrous acid changes with time rate more than 20 μ g/ (Ld) or free when control is in control threshold
When the concentration of ammonia changes with time rate more than 25mg/ (Ld), PLC controller 47 issues warning signal, and adjusts autotrophy at this time
PH during biological denitrificaion pond 4 intakes is less than 500mg/L in 7-8 and ammonia nitrogen concentration, make free ammonia in denitrification of autotrophic organism pond 4 and
Free nitrous acid concentration is controlled respectively in 1-25mg/L and 5-20 μ g/L.
4, in the denitrification of autotrophic organism pond 4, when the concentration and water inlet ammonia of the nitrate nitrogen in denitrification of autotrophic organism pond 4
When the ratio of nitrogen concentration is more than 0.15, PLC controller 47 issues warning signal, and air blower 48 is adjusted by PLC controller 47
Aeration quantity so that the ratio of nitrate nitrogen concentration and influent ammonium concentration in denitrification of autotrophic organism pond 4 maintains 0.1-0.15
Between.
Realization process is illustrated to the high nitrogenous petrochemical wastewater device of the utility model and the method for carrying out parameter adjustment by embodiment：
Process object：The petrochemical wastewater that certain petrochemical plant generates, the ammonia nitrogen concentration in the waste water is 900mg/L, and COD is dense
Degree is 1200mg/L, concentration of suspension 250mg/L, pH=7-8.
(1) Anaerobic Treatment removes toxic organics difficult to degrade
Petrochemical wastewater from intake pump 11 enters anaerobic pond 1, and hydraulic detention time of the sewage in anaerobic pond 1 is 12-
48h, keeps the temperature of anaerobic pond 1 at 30-35 DEG C by constent temperature heater 17, and fixed bio-carrier is added in anaerobic pond 1
112, carrier selects suspension ball-type carrier, carrier to connect and fix by rope yarn, Carrier diameters 3cm, and the rate that adds of carrier is body
The 30% of product ratio, the mixed liquor in anaerobic pond 1 is under the action of three separator 15, being separated in mixed liquor, the natural pond of separation
Gas gas is collected by 114 top of collection chamber exhaust sky 16, and sludge precipitates again enters anaerobic pond reaction zone 14, the liquid isolated
Body is discharged by outlet pipe 110, and heterotrophic denitrification pond 2 is entered under the action of intake pump 21, and sludge is from 113 row of bottom sludge pipe
Go out.By Anaerobic Treatment, the difficult to degrade poisonous and harmful of the COD and degradation 90%-95% of the 70%-80% in raw water can be removed
Organic matter, water outlet COD is about 400-420mg/L.
(2) organic matter in the nitrate nitrogen and water inlet of heterotrophic denitrification removal denitrification of autotrophic organism pond effluent recycling
The water outlet of anaerobic pond 1 is flowed up by entering the heterotrophic denitrification pond in heterotrophic denitrification pond 2 under the action of intake pump 21
Area 24, adds fixed bio-carrier 22 in heterotrophic denitrification pond 2, and fixed bio-carrier 22 is selected suspension ball-type carrier and passed through
Rope yarn series connection is fixed, Carrier diameters 3cm, and carrier adds rate as the 30% of volume ratio.Mixed liquor is carried agitating device 29
Enter the areas heterotrophic denitrification Chi Jiangliu 25 from 27 top of deflector under rising, heterotrophic denitrifying Bacteria on fixed bio-carrier 22 and different
Support the nitric acid that the heterotrophic denitrifying Bacteria of floc sludge in denitrification pond 2 is flowed back the second sedimentation basin 5 using the organic matter in water inlet
Salt nitrogen generates nitrogen, by the fixed bio-carrier 22 of addition, ensures the sludge concentration in heterotrophic denitrification pond 2 in 10000mg/L
More than.Heterotrophism is controlled by PLC controller 47, heating rod 26 and the joint control of heterotrophic denitrification pond combined type on-line detector 212
The temperature in denitrification pond 2 passes through PLC controller 47, air blower 48 and heterotrophic denitrification pond combined type on-line checking at 30-35 DEG C
The sewage backflow in the joint control control heterotrophic denitrification pond 2 of instrument 212 than control 800%, water of the sewage in heterotrophic denitrification pond 2
The power residence time in 12-24h, is handled by heterotrophic denitrification, and the COD that 363mg/L can be achieved in heterotrophic denitrification pond 2 is gone
It removes, nitrate nitrogen can remove 87%.A mixed liquor part for 25 lower part of the areas heterotrophic denitrification Chi Jiangliu reenters the anti-nitre of heterotrophism
Change pond up-flow area 24, another part enters the first sedimentation basin 3 by sludge reflux seam 28.
The separation of solid and liquid of (3) first sedimentation basins
The effect of first sedimentation basin 3 is mainly separated by solid-liquid separation the water mixed liquid that in heterotrophic denitrification pond 2, mixed liquor
Enter the first sedimentation basins 3 by sludge reflux seam 28, mixed liquor the first sedimentation basin 3 hydraulic detention time in 3-6h, in weight
It completes to be separated by solid-liquid separation under force effect, water outlet concentration of suspension drops to 70mg/L, and precipitating sludge is voluntarily slided by sludge reflux seam 28
Enter heterotrophic denitrification pond 2, excess sludge is discharged from sludge pipe 32 as needed, and supernatant enters autotroph by spout hole 31
Denitrification tank 4.
(4) ammonia nitrogen in denitrification of autotrophic organism removal sewage
Sewage enters denitrification of autotrophic organism pond 4 from the spout hole 31 of the first sedimentation basin 3, is thrown in denitrification of autotrophic organism pond 4
Add suspended biological carrier 43, for suspended biological carrier 43 using modified Raschig ring carrier, size is diameter × height × wall thickness=D × H
× W=1cm × 1cm × 2mm, the rate that adds are 30%, and a space parallax can be provided for microorganism using modified Raschig ring carrier,
To provide respectively suitable ecological niche respectively to the autotrophic denitrification microorganism of different function：Short distance nitration bacterium is in the outside of carrier
Aerobic zone growth, short distance nitration bacterium utilize water body in dissolved oxygen about 50% ammonium oxidation in water inlet at nitrite
Nitrogen；Anaerobic ammonia oxidizing bacteria is grown in the anoxic zone inside carrier, and anaerobic ammonia oxidizing bacteria utilizes the nitrous that short distance nitration bacterium generates
Hydrochlorate nitrogen and remaining ammonia nitrogen carry out effect and generate nitrogen, to the ammonia nitrogen removal in sewage.Simultaneously in denitrification of autotrophic organism
Suspended biological carrier device for trapping 51 is set between pond 4 and the second sedimentation basin 5, and suspended biological carrier device for trapping 51 is using netted
Structure, for material using high molecular materials such as nontoxic polyethylene difficult to degrade, the size of reticular structure is 6mm.Pass through suspension
Bio-carrier 43 can quickly be enriched with denitrification of autotrophic organism sludge, while pass through suspended biological carrier device for trapping 51
Prevent suspended biological carrier 43 with going out flow in the reactor the retention of suspended biological carrier 43 in denitrification of autotrophic organism pond 4
Go out.It can be in 3-5 months to autotroph by adding the suspended biological carrier 43 and suspended biological carrier device for trapping 51
Denitrifying sludge is enriched with, while keeping in denitrification of autotrophic organism pond 4 sludge concentration in 10 000mg/L or more.
Sewage is after the spout hole 31 of the first sedimentation basin 3 enters denitrification of autotrophic organism pond 4, in denitrification of autotrophic organism pond 4
By circular treatment：Air is squeezed by 41 bottom of denitrification of autotrophic organism pond up-flow area by aerator 45 using air blower 48, it will
Mixed liquor and suspended biological carrier 43, which are promoted, arrives 41 top of denitrification of autotrophic organism pond up-flow area, mixed liquor and suspended biological carrier 43
Enter the areas denitrification of autotrophic organism Chi Jiangliu 42 by 44 top of deflector, later suspended biological carrier 43 and a part of mixed liquor warp
The sludge gravity flow area 46 for crossing 42 bottom of the areas denitrification of autotrophic organism Chi Jiangliu reenters 41 lower part of denitrification of autotrophic organism pond up-flow area
It is recycled；The removal efficiency that ammonia nitrogen is improved by interior cycle, can be achieved the ammonia of 894mg/L in denitrification of autotrophic organism pond 4
Nitrogen removes, and removal rate reaches 99%.In denitrification of autotrophic organism pond 4, pass through PLC controller 47, heating rod 26 and autotroph
The temperature in the joint control control denitrification of autotrophic organism pond 4 of denitrification tank combined type on-line detector 49 is at 30-35 DEG C；It is controlled by PLC
Device 47, air blower 48 and denitrification of autotrophic organism pond combined type on-line detector 49 joint control by the dissolving in denitrification of autotrophic organism pond 4
Oxygen is controlled in 0.5mg/L or so；Control simultaneously pH in denitrification of autotrophic organism pond 4 7-8, the concentration of free ammonia in 1-25mg/L and
Free nitrous acid concentration is in 5-20 μ g/L.Hydraulic detention time of the sewage in denitrification of autotrophic organism pond 4 is 3-8h, at this time autotrophy
The nitrogen volume elimination capacity rate in biological denitrificaion pond 4 is up to 2.7-7.2kg/ (m3·d).Another part mixed liquor passes through suspended biological
Carrier device for trapping 51 enters the second sedimentation basin 5.
Removal of (5) second sedimentation basins to suspended matter
Mixed liquor in denitrification of autotrophic organism pond 4 enters the second sedimentation basin 5 by suspended biological carrier device for trapping 51 and sinks
It forms sediment, hydraulic detention time of the mixed liquor in the second sedimentation basin 5 reaches 50mg/L in 3-6h, water outlet concentration of suspension, and precipitation is dirty
Mud enters denitrification of autotrophic organism pond 4 from sludge gravity flow area 46, and water outlet is from 52 part discharge of outlet pipe, and a part is by being discharged back
Stream pump 55 flows back into heterotrophic denitrification pond 2.
(6) sewage is flowed between the first sedimentation basin 3 and denitrification of autotrophic organism pond 4 by overflow type, heterotrophic denitrification
Pond 2 and the first sedimentation basin 3, denitrification of autotrophic organism pond 4 and the second sedimentation basin 5 are all made of Round Sump, save sludge reflux pump and pipe
Road reduces hydraulic loss, to reduce the operating cost of 20%-30%.
(7) method that the nitrogenous petrochemical wastewater processing unit of novel height carries out parameter adjustment
In the novel nitrogenous petrochemical wastewater processing unit of height, pass through heterotrophic denitrification pond combined type on-line detector
Temperature, nitrate nitrogen concentration, pH and ammonia nitrogen concentration parameter in 212 detection heterotrophic denitrification ponds 2；Pass through denitrification of autotrophic organism pond
Combined type on-line detector 49 detects temperature, dissolved oxygen concentration, nitrate nitrogen concentration, pH and the ammonia in denitrification of autotrophic organism pond 4
Nitrogen concentration parameter, the data analysis module in PLC controller 47 is to coming from denitrification of autotrophic organism pond combined type on-line detector 49
It is analyzed with the data of heterotrophic denitrification pond combined type on-line detector 212, it is free in denitrification of autotrophic organism pond 4 to analyze
The concentration of the concentration of ammonia and free nitrous acid, the free ammonia in denitrification of autotrophic organism pond 4 and free nitrous acid changes with time
The ratio of nitrate nitrogen concentration and influent ammonium concentration in rate, denitrification of autotrophic organism pond 4, heterotrophic denitrification pond 2 and from health
Temperature in object denitrification tank 4, these parameters with the standard parameter in the data analysis module in PLC controller 47 by being compared
Right, when these parameters are above standard parameter, the warning module in PLC controller 47 gives a warning, and to denitrification of autotrophic organism
Pond 5 is adjusted according to the following steps：
1) when the temperature in the denitrification of autotrophic organism pond 4 and heterotrophic denitrification pond 2 is less than 30 DEG C, PLC controller 47
It issues warning signal, PLC controller 47 is heated by controlling the closure of heating rod 26, when denitrification of autotrophic organism pond 4 and different
When supporting the temperature rise in denitrification pond 2 to 30-35 DEG C, PLC controller 47 stops heating by controlling heating rod 26, ensures to make
Temperature in denitrification of autotrophic organism pond 4 and heterotrophic denitrification pond 2 is at 30-35 DEG C；When temperature is higher than 35 DEG C, PLC controller 47
It issues warning signal, PLC controller 47 is disconnected by controlling heating rod 26, makes denitrification of autotrophic organism pond 4 and heterotrophic denitrification pond 2
In temperature be maintained at 30-35 DEG C.
2) in the denitrification of autotrophic organism pond 4, when the concentration of free ammonia in denitrification of autotrophic organism pond 4 be more than 25mg/L or
When free nitrous acid concentration is more than 20 μ g/L, PLC controller 47 issues warning signal, at this time adjustment denitrification of autotrophic organism pond 4 into
PH in water is 450mg/L in 7-8 and ammonia nitrogen concentration, ensures that free ammonia in denitrification of autotrophic organism pond 4 and free nitrous acid are dense
Degree is controlled respectively in the range of 1-25mg/L and 5-20 μ g/L.
3) in the denitrification of autotrophic organism pond 4, when in denitrification of autotrophic organism pond 4 guarantor's free ammonia and free nitrous acid it is dense
Degree is controlled respectively in 1-25mg/L and 5-20 μ g/L, when the concentration of free nitrous acid changes with time rate more than 20 μ g/
(Ld) when or the concentration of free ammonia changes with time rate more than 25mg/ (Ld), and PLC controller 47 sends out early warning letter
Number, it is 450mg/L to adjust the pH during denitrification of autotrophic organism pond 4 intakes at this time in 7-8 and ammonia nitrogen concentration, ensures denitrification of autotrophic organism
Free ammonia and free nitrous acid concentration in pond 4 are controlled respectively in 1-25mg/L and 5-20 μ g/L.
4) in the denitrification of autotrophic organism pond 4, when the nitrate nitrogen concentration and influent ammonia nitrogen in denitrification of autotrophic organism pond 4
When the ratio of concentration is more than 0.15, PLC controller 47 issues warning signal, and regulating and controlling air blower 48 at this time reduces ventilation quantity, to
The dissolved oxygen concentration in denitrification of autotrophic organism pond 4 is adjusted in 0.5mg/L or so, to ensure the nitre in denitrification of autotrophic organism pond 4
The ratio of hydrochlorate nitrogen concentration and influent ammonium concentration maintains between 0.1-0.15.
It is protected by the early warning and regulation and control of the above parameter to realize real-time control and the early warning to denitrification of autotrophic organism pond 4
Demonstrate,prove the Effec-tive Function steady in a long-term in denitrification of autotrophic organism pond 4.
For high nitrogenous petrochemical wastewater after this method is handled, dependent processing unit mainly pollutes high nitrogenous petrochemical wastewater
The reduction situation of object is as shown in table 1.By table 1 as it can be seen that suspended matter, COD, ammonia nitrogen, total nitrogen can meet《Petro chemical industry is polluted
Object discharge standard》Direct emission standard in (GB 31571-2015).
Reduction situation of 1 this method of table to certain petrochemical wastewater major pollutants
(raw water, water outlet and removal amount unit：mg/L)
Remarks："-" indicates no related data.
Claims (7)
1. a kind of novel nitrogenous petrochemical wastewater processing unit of height, which includes sequentially connected anaerobic pond (1), heterotrophic denitrification
Pond (2), the first sedimentation basin (3), denitrification of autotrophic organism pond (4) and the second sedimentation basin (5)；
The anaerobic pond water inlet pipe (12) of the anaerobic pond (1) is connect by pipeline with intake pump (11), anaerobic pond water inlet pipe (12)
It is connect with anaerobic pond reaction zone (14) by flange, anaerobic pond reaction zone (14) is connected by flange and three phase separator (15) later
It connects, the outlet pipe (110) of anaerobic pond (1) is connect by pipeline with intake pump (21)；Anaerobic pond (1) is equipped with constant-temperature heating system：
Constant temperature water bath (19), constant temperature water bath (19) are equipped between anaerobic pond reaction zone (14) and constant temperature water bath outer wall (115)
Constant temperature water bath water inlet pipe (18), constant temperature water bath outlet pipe (111) connect respectively with constent temperature heater (17) by pipeline,
Filled with fixed bio-carrier (112) in the anaerobic pond reaction zone (14) of anaerobic pond (1)；The anaerobic pond of anaerobic pond (1) reacts
The bottom in area (14) is equipped with sludge pipe (113)；Band gas is equipped on the top of the three phase separator (15) of anaerobic pond (1) simultaneously to receive
The collection chamber (114) of collector (16)；
It is connect with intake pump (21) by pipeline in the heterotrophic nitrification pond up-flow area (24) of the heterotrophic denitrification pond (2), heterotrophism
Denitrification pond (2) is internally provided with deflector (27), and deflector (27) side is heterotrophic denitrification pond up-flow area (24), the other side
For the areas heterotrophic denitrification Chi Jiangliu (25), the areas the heterotrophic denitrification Chi Jiangliu (25) lower part be equipped with sludge reflux seam (28) and with
First sedimentation basin (3) connects；Filled with fixed bio-carrier (22) in heterotrophic denitrification pond (2)；In heterotrophic denitrification pond (2)
Bottom be equipped with agitating device (29) and by agitating paddle (210) and stirring motor (23), heating rod (26) is located at the anti-nitre of heterotrophism
Change pond up-flow area (24) liquid level or less and is connect with PLC controller (47)；Heterotrophic denitrification pond (2) is additionally provided with heterotrophic denitrification pond
Combined type on-line detector (212) is simultaneously connect with PLC controller (47), PLC controller (47) by pipeline respectively be located at from
Denitrification of autotrophic organism pond combined type on-line detector (49), air blower (48) in health object denitrification tank (4) and effluent recycling pump
(55) it connects, air blower (48) is connect by pipeline with aerator (45)；The recycling effluent water inlet in heterotrophic denitrification pond (2)
(211) it is connect with effluent recycling pump (55) by pipeline；
First sedimentation basin (3) is connect by sludge reflux seam (28) with heterotrophic denitrification pond (2), and the first sedimentation basin (3) is logical
The spout hole (31) for crossing top is connect with denitrification of autotrophic organism pond (4)；
The denitrification of autotrophic organism pond (4) is connect by spout hole (31) with the first sedimentation basin (3), denitrification of autotrophic organism pond (4)
Be internally provided with deflector (44), the denitrification of autotrophic organism pond up-flow area (41) of deflector (44) side, the other side from health
The areas object denitrification tank Jiang Liu (42), the dirt that the denitrification of autotrophic organism pond (4) passes through the areas denitrification of autotrophic organism Chi Jiangliu (42) lower part
Mud gravity flow area (46) is connected to the second sedimentation basin (5)；Suspended biological carrier (43) is filled in denitrification of autotrophic organism pond (4), together
When denitrification of autotrophic organism pond (4) the areas denitrification of autotrophic organism Chi Jiangliu (42) and the second sedimentation basin (5) between be equipped with suspended biological
Carrier device for trapping (51)；The bottom in denitrification of autotrophic organism pond (4) is equipped with aerator (45), and aerator (45) passes through pipeline
It is connected with air blower (48)；
The water outlet of second sedimentation basin (5) is discharged by the outlet pipe (52) on top, and the water outlet of the second sedimentation basin (5) is divided into two
Road：It is discharged all the way by outlet pipe (52), another way is connect by effluent recycling pipe (53) with effluent recycling pump (55), and pipe is passed through
Road flows back into heterotrophic denitrification pond (2), while effluent recycling pump (55) is connect with PLC controller (47).
2. the nitrogenous petrochemical wastewater processing unit of novel height according to claim 1, it is characterized in that：The suspended biological carrier
(43) it is modified Raschig ring carrier, modified Raschig ring carrier dimensions are diameter × height × wall thickness=D × H × W=1-10cm × 1-
10cm×2-5mm。
3. the nitrogenous petrochemical wastewater processing unit of novel height according to claim 1, it is characterized in that：The heterotrophic denitrification pond
(2) mixed liquor in rises to heterotrophic denitrification pond by agitating device (29) from the bottom in heterotrophic denitrification pond up-flow area (24)
It flows up at the top of area (24), is entered from the areas heterotrophic denitrification Chi Jiangliu (25), from autotroph by deflector (27) top overflow
The areas denitrification tank Jiang Liu (25) top flows down to the areas denitrification of autotrophic organism Chi Jiangliu (25) lower part, passes through deflector (27) lower part
It reenters in heterotrophic denitrification pond up-flow area (25), forms internal circulation system.
4. the nitrogenous petrochemical wastewater processing unit of novel height according to claim 1, it is characterized in that：The denitrification of autotrophic organism
Mixed liquor and suspended biological carrier (43) in pond (4) are by aerator (45) from denitrification of autotrophic organism pond up-flow area (41)
Bottom rises at the top of denitrification of autotrophic organism pond up-flow area (41), enters denitrification of autotrophic organism by deflector (44) top overflow
Behind the areas Chi Jiangliu (42), the areas denitrification of autotrophic organism Chi Jiangliu are flowed down to from the areas denitrification of autotrophic organism Chi Jiangliu (42) top
(42) sludge gravity flow area (46) of lower part, reenters denitrification of autotrophic organism pond up-flow area (41), in denitrification of autotrophic organism later
Internal circulation system is formed in pond (4).
5. the nitrogenous petrochemical wastewater processing unit of novel height according to claim 1, it is characterized in that：The PLC controller
(47) it is the expansible PLC controller of GCAN-PLC-400 types, data analysis module and early warning mould is equipped in PLC controller (47)
Block.
6. the nitrogenous petrochemical wastewater processing unit of novel height according to claim 1, it is characterized in that：The fixed bio-carrier
(112) it is suspension ball-type carrier, carrier dimensions are a diameter of 1-10cm, and carrier is fixed on anaerobic pond reaction zone (14) by rope yarn
In.
7. the method that parameter adjustment is carried out using the nitrogenous petrochemical wastewater processing unit of the novel height of claim 1, it is characterized in that：It should
Method includes the following steps：
In the novel nitrogenous petrochemical wastewater processing unit of height, pass through heterotrophic denitrification pond combined type on-line detector (212)
Detect the parameters such as temperature, nitrate nitrogen concentration, pH and the ammonia nitrogen concentration in heterotrophic denitrification pond (2)；Pass through denitrification of autotrophic organism
Pond combined type on-line detector (49) detect denitrification of autotrophic organism pond (4) in temperature, dissolved oxygen concentration, nitrate nitrogen concentration,
PH and ammonia nitrogen concentration parameter, the data analysis module in PLC controller (47) are online to coming from denitrification of autotrophic organism pond combined type
The data of detector (49) and heterotrophic denitrification pond combined type on-line detector (212) are analyzed, de- to analyze autotroph
The concentration of free ammonia and free nitrous acid in nitrogen pond (4), the free ammonia in denitrification of autotrophic organism pond (4) and free nitrous acid
Concentration changes with time ratio, the heterotrophism of rate, the nitrate nitrogen concentration in denitrification of autotrophic organism pond (4) and influent ammonium concentration
Temperature in denitrification pond (2) and denitrification of autotrophic organism pond (4), these parameters with the data in PLC controller (47) by dividing
Analysis mould standard parameter in the block is compared, pre- in PLC controller (47) when the variation of these parameters is above standard parameter
Alert module gives a warning, and is adjusted according to the following steps to denitrification of autotrophic organism pond (5)：
1) in the denitrification of autotrophic organism pond (4), when the temperature in denitrification of autotrophic organism pond (4) is less than 30 DEG C or higher than 35
DEG C when, PLC controller (47) issues warning signal, PLC controller (47) pass through control heating rod (26) regulate and control heterotrophic denitrification
Temperature in pond (2) and denitrification of autotrophic organism pond (4) is at 30-35 DEG C；
2) in the denitrification of autotrophic organism pond (4), the concentration of free ammonia and free nitrous acid in denitrification of autotrophic organism pond (4)
Control threshold range is respectively 15-25mg/L and 15-20 μ g/L, when the concentration of free ammonia and free nitrous acid is more than control threshold
When, PLC controller (47) issues warning signal, and the pH adjusted at this time in denitrification of autotrophic organism pond (4) water inlet is dense in 7-8 and ammonia nitrogen
Degree is less than 500mg/L, and free ammonia and free nitrous acid concentration in denitrification of autotrophic organism pond (4) is made to be controlled respectively in 1-25mg/L
With 5-20 μ g/L；
3) in the denitrification of autotrophic organism pond (4), the concentration of free ammonia and free nitrous acid in denitrification of autotrophic organism pond (4)
It is when the concentration of free nitrous acid changes with time rate more than 20 μ g/ (Ld) or free when control is in control threshold
When the concentration of ammonia changes with time rate more than 25mg/ (Ld), PLC controller (47) issues warning signal, and adjustment at this time is certainly
PH in health object denitrification tank (4) water inlet is less than 500mg/L in 7-8 and ammonia nitrogen concentration, makes the trip in denitrification of autotrophic organism pond (4)
It is controlled respectively in 1-25mg/L and 5-20 μ g/L from ammonia and free nitrous acid concentration；
4) in the denitrification of autotrophic organism pond (4), when the concentration and water inlet ammonia of the nitrate nitrogen in denitrification of autotrophic organism pond (4)
When the ratio of nitrogen concentration is more than 0.15, PLC controller (47) issues warning signal, and air blower is adjusted by PLC controller (47)
(48) aeration quantity so that the ratio of nitrate nitrogen concentration and influent ammonium concentration in denitrification of autotrophic organism pond (4) maintains
Between 0.1-0.15.
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