CN103011406A - Improved sequencing batch primary sludge fermentation coupling denitrification device and method - Google Patents
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Abstract
The invention discloses an improved sequencing batch primary sludge fermentation coupling denitrification device and method, which belong to the technical field of treatment of municipal sewage and biochemical treatment of primary sludge. The device is provided with a water inlet tank, a sequencing batch sludge fermentation coupling denitrification reactor, a sludge storage pool and a water outlet tank; through improvement of the reactor and a control method, the releasing amount of ammonia nitrogen can be reduced in the fermentation process, the removal of the ammonia nitrogen in a sludge fermentation coupling denitrification device is intensified, and the target of increasing the removal rate of total nitrogen is achieved in the end. Aiming at the characteristics of primary sludge, process development and optimization are carried out, the improved sequencing batch primary sludge fermentation coupling denitrification device is suitable for C/N ratio municipal sewage and can save carbon sources and increase nitrogen removal efficiency. A micro-aerobic time-limited aeration method is innovatively adopted so that the release of the ammonia nitrogen is effectively controlled, the effect of intensified denitrification of the carbon sources in the sludge is increased, and the quality of discharged water is improved.
Description
Technical field
The present invention relates to primary sludge and municipal effluent and treatment technology, the primary sludge that produces take municipal wastewater treatment plant is as substrate, the volatile organic acids that its fermentation is produced etc. are as the electron donor of denitrifying bacteria reduction-oxidation attitude nitrogen, in the sequence batch (reaction unit, realize the denitrification denitrogenation of the preliminarily stabilised municipal effluent of primary sludge, and to the device operation be optimized improvement, make the carbon source of its fermenting process generation under the prerequisite that satisfies municipal effluent denitrification needs, reduce as far as possible the fermentation byproducts such as ammonia nitrogen, COD to the impact of effluent quality.This invention is applicable to primary sludge process field and municipal sewage treatment field, also is applicable to other low C/N ratio wastewater and processes.
Background technology
China in " urban wastewater treatment firm pollutant emission standard " GB18918-2002 that promulgated in 2002, require all pollutant discharging unit's effluent qualities be ammonia nitrogen less than 5mg/L, total nitrogen is less than 15mg/L one-level A standard.Body eutrophication is day by day serious, and the removal of nitrogen has become the subject matter of current sewage disposal and regeneration.Denitrogenation depends on heterotrophic denitrifying Bacteria and utilizes organism as electron donor reduction-oxidation attitude nitrogen.And the present ubiquity water inlet of the city domestic sewage of China C/N is low, and the insufficient problem of carbon source often affects denitrification effect.For arriving the emission standard of increasingly stringent, many Sewage Plant take to add the mode of outer carbon source strengthened denitrification, or carry out the upgrading of technique.
Oxygen-starved area in biological treatment adds outer carbon source and can obtain good denitrification effect, but can follow occur that operational management is numerous and diverse, processing costs increase, excess sludge production increase and CO
2Isothermal chamber gas increases the problems such as row.On the other hand, produce a large amount of mud in the sewage treatment process, comprise primary sludge and excess sludge.How cost-effectively treatment and disposal mud also is the difficult problem that numerous sewage works face.For above problem, the internal carbon source development technology comes into one's own, and the mud that namely utilizes sewage work's original position to produce ferments, and makes it produce available carbon source for the denitrifying bacteria utilization.This method both had been conducive to the preliminarily stabilised of mud, had also replenished carbon source for biological denitrificaion.
In addition, just heavy mud often becomes the source of sewage work's foul odour because being rich in easy degraded suspension organic matter.Present most water factories adopt regularly to clear up preliminary sedimentation tank, mud cake outward transport or mix with excess sludge and carry out sludge digestion and process.Just heavy mud there are differences in nature with excess sludge, can separate treatment in field of sludge treatment, and take separately optimum reaction conditions with intensification sludge treatment degree.Still study seldom for the treatment technology of primary sludge at present.
There are some limitations in traditional mud that utilizes for the method for substrate exploitation carbon source, as is accompanied by the release that can utilize carbon source, and the pollutents such as ammonia nitrogen also discharge from mud in a large number, have caused secondary pollution; And the oxygen-starved area that the elutriation liquid that often ferments is directly squeezed into biological denitrificaion is used to denitrifying bacteria that carbon source is provided, and the oxygen-starved area does not have the ammonia nitrogen removal approach, thereby finally affects effluent quality.On the other hand, the stripping of tunning such as the volatile fat acids etc., has increased the viscous force of fermentation mixed solution greatly, brings the problems such as dewatering performance of sludge is poor, mud-water separation is difficult.
The present invention is devoted to solve above-mentioned each problem.Than traditional denitrification process, the present invention not only has the advantages such as stable primary sludge, saving additional carbon, reduction working cost, present method is coupling in fermentation and the municipal effluent denitrification of primary sludge in the same system simultaneously, and introduce little oxygen strategy such as nitrated of prescribing a time limit and realize that sludge fermentation discharges effective removal of ammonia nitrogen, reach the raising nitrogen removal rate, strengthened the mud-water separation effect, improved the target such as effluent quality.
Summary of the invention
The present invention utilizes sequencing batch reactor, and the denitrification of primary sludge fermentative action and municipal effluent is coupling in the same system, and the tunning of primary sludge such as voltaile fatty acid and some simple organics etc., can be consumed by denitrifying bacterium on the spot.The product that this method has been removed sludge fermentation suppresses, and promotes continuing, efficiently carrying out of sludge fermentation effect, so that sludge internal carbon source can farthest be utilized, realizes simultaneously the preliminarily stabilised of primary sludge.In addition, the prescribe a time limit application of aeration strategy of little oxygen efficiently solves the excessive release difficult problem that sludge internal carbon source utilizes the ammonia nitrogen in the process, has stablized effluent quality.
The present invention is achieved through the following technical solutions:
1, a kind of improved device of sequence batch (primary sludge fermentation coupling denitrification is characterized by the strengthened denitrification than municipal effluent for low C/N, comprises the water tank inlet 1, sludge fermentation coupling denitrification reactor 5, mud retention tank 6 and the water tank 9 that connect successively.
Wherein water tank inlet 1 links to each other with sludge fermentation coupling denitrification reactor 5 with peristaltic pump 4 by water intaking valve 2, and intake valve 3 links to each other with peristaltic pump 4.Sludge fermentation coupling denitrification reactor 5 interior installation agitators 10, and the setting heating rod 11 and the temperature sensor 12 that link to each other with outside temperature control box 13.Gas extractor 14 is installed on sludge fermentation coupling denitrification reactor 5 tops, and ORP on-line determination instrument 15 and pH on-line determination instrument 16 are installed in both sides.Mud retention tank 6 links to each other with sludge fermentation coupling denitrification reactor 5 by adding dredge pump 7, and sludge fermentation coupling denitrification reactor 5 links to each other with water tank 9 by outlet valve 8.
2, the control method of the improved device of described sequence batch (primary sludge fermentation coupling denitrification mainly may further comprise the steps:
It is the municipal effluent nitrification liquid through aerobic pretreatment in the water tank inlet 1, sludge fermentation coupling denitrification reactor 5 is alternately moving under the anaerobic-anoxic environment, take primary sludge as fermentation substrate, enrichment culture fermenting bacteria and denitrifying bacterium, per cycle is experienced successively and adds mud, anaerobism stirring, water inlet, air inlet, anoxia stirring, precipitation, draining, idle 8 sequential.
I adds the mud startup and adds dredge pump 7, and primary sludge is squeezed into sludge fermentation coupling denitrification reactor 5 in the mud retention tank 6.It is 1/20 of reactor useful volume that setting adds the mud volume; The II anaerobism stirs and sets the anaerobism churning time is 9-20 hour, agitator 10 continuous firings during this.
It is 1/2 of reactor useful volume that flooding quantity is set in the III water inlet.Water intaking valve 2 and peristaltic pump 4 are opened, and the nitrification liquid in the water tank inlet 1 enters into sludge fermentation coupling denitrification reactor 5 by peristaltic pump 4.
IV air inlet air inlet period intake valve 3 is opened, and peristaltic pump 4 works on.Outside air is driven into sludge fermentation coupling denitrification reactor 5 by peristaltic pump 4, reaches the purpose of removing ammonia nitrogen by nitrification.DO concentration in the assaying reaction device as 1. DO 〉=0.2mg/L or when 2. inlet period t＞20 a minute condition occurs, is closed intake valve 3 and peristaltic pump 4, enters next sequential.
The fermentative action of denitrification and the primary sludge of municipal effluent mainly occurs in this stage of V anoxia stirring.According to on-line monitoring pH and ORP, control stops constantly in the flex point of pH or ORP the anoxia stirring time, namely when 1. dpH/dt≤0 and t 〉=30 minute or when 2. d ORP/dt≤-50 and t 〉=30 minute occur, closes agitator 10, and the anoxia stirring period finishes.
It is 1-2 hour that the VI precipitation is set sedimentation time, and precipitate phase is finished mud-water separation.
It is 1/2 that the draining ratio is set in the VII draining, is controlled by time switch.Outlet valve 8 is opened, and supernatant liquor enters water tank 9 through outlet pipeline.
The idle draining of VIII finishes to begin to be defined as lay-up period to next cycle, and setting idle mixing time is 1-2 hour, and finishes spoil disposal in the idle stage, and the spoil disposal volume is 1/20 of reactor useful volume.
This invention passes into a small amount of oxygen in sludge fermentation coupling denitrification system, can stimulate fermentative action to carry out to deeper degree on the one hand, and the mineralized nitrogen approach is provided on the one hand.Do not adopt traditional gas blower aeration, but adopt the peristaltic pump air inlet, can effectively control the tolerance that enters reactor, unlikely fermentation activity and denitrification activity are had a negative impact.Compare with the traditional sludge fermentation unit, advantage of the present invention is:
1 optimizes reaction conditions for the primary sludge speciality, is a kind of efficient, primary sludge treatment process of saving.Through processing, it is few that the primary sludge interior carbon source obtains the secondary pollutants releases such as release and ammonia nitrogen substantially, and mud obtains preliminarily stabilised.
2 economical and efficients.This invention is coupling in sludge fermentation system and municipal effluent denitrification system in the same reactor, so that mutual augmenting response power is mutually promoted in fermentative action and denitrification;
3 system's nitric efficiencies are high.Present method is utilized the peristaltic pump oxygen supply of prescribing a time limit innovatively, and drops into a small amount of nitrobacteria when water inlet, and the removal approach of ammonia nitrogen in fermentation system creatively is provided, and has solved in all Alternatives of sludge fermentation the difficult problems such as ubiquitous ammonia nitrogen burst size is large.And because denitrifying bacteria is tamed under oxygen free condition for a long time in the reactor, little oxygen condition in short-term can not affect denitrifying bacteria and utilize nitric nitrogen or nitrite nitrogen to carry out the denitrification activity as electron acceptor(EA).Native system is higher than the traditional technology nitric efficiency.
4 water inlets share a peristaltic pump with air inlet, reduce investment outlay and working cost.System does not need extra fermented liquid to eluriate the devices such as pipeline, settling tank in addition, and floor space is little, economical and efficient.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention
Fig. 2 is the situation map of the total nitrogen removal effect of continuous operation
Among the figure: 1---water tank inlet; 2---water intaking valve; 3---intake valve; 4---peristaltic pump; 5---sludge fermentation coupling denitrification reactor; 6---the mud retention tank; 7---add dredge pump; 8---outlet valve; 9---water tank; 10---agitator; 11---heating rod; 12---temperature sensor; 13---temperature controller; 14---gas extractor; 15---ORP on-line determination instrument; 16---pH on-line determination instrument.
Embodiment
In conjunction with the accompanying drawings and embodiments to the application's patent further instruction: as shown in Figure 1, sludge fermentation coupling denitrification device of the present invention is made of water tank inlet 1, sludge fermentation coupling denitrification reactor 5, mud storage pool 6, water tank 9 etc.Water tank inlet 1 is 15L, links to each other with sludge fermentation coupling denitrification reactor 5 by peristaltic pump 4; Sludge fermentation coupling denitrification reactor 5 is the cylindrical reactor of synthetic glass quality, and useful volume is 10L, links to each other with water tank 9 by outlet valve 8, and water tank 9 volumes are 15L.Water intaking valve 2 links to each other with peristaltic pump 4 with intake valve 3, and nitrification liquid and air inject sludge fermentation coupling denitrification reactor 5 by peristaltic pump in each cycle; Mud retention tank 6 links to each other with sludge fermentation coupling denitrification reactor 5 by adding dredge pump 7, carries primary sludge in reactor.Stir at sludge fermentation coupling denitrification reactor 5 interior installation agitators 10, guarantee that mud mixes in fermenting process and the denitrification process, the reinforcing mass transfer effect; PH and ORP that ORP on-line determination instrument 15 and pH on-line determination instrument 16 take the continuous monitoring mixed solution are installed simultaneously, so that the control reaction process.
The city domestic sewage nitrification liquid that embodiment uses is the water outlet of septic tank waste water after aerobic treatment of dependents' district, Beijing, nitric nitrogen is about 10mg/L, nitrite nitrogen is about 27mg/L, COD concentration is about 40mg/L and this part COD is difficult for being utilized by denitrifying bacteria, the SS major part of nitrification liquid is the aerobic activated sludge flco, and its concentration is about 100mg/L.Primary sludge in the mud storage pool 6 is taken from the pressure pipeline behind the Sewage Plant gravity concentration tank of Beijing, is typical primary sludge, concentration 10kgMLSS/m
3, the ratio of volatile sludge concentration MLVSS and sludge concentration MLSS is between 0.55～0.60.The MLSS of sludge fermentation coupling denitrification reactor 5 is 8000 ~ 10000mg/L, and SRT is controlled to be 10 days.
Embodiment one:
I adds the mud startup and adds dredge pump 7, squeezes into sludge fermentation coupling denitrification reactor 5 through the fresh primary sludge of dilution in the mud retention tank 6.It is 0.5L that the setting single adds the mud amount, and adding dredge pump 7 flows is 500ml/ minute, and adding the mud time is 5 minutes.
The II anaerobism stirs and sets the anaerobism churning time is 9 hours.Agitator 10 continuous firings during this.
III water inlet water intaking valve 2 and peristaltic pump 4 are opened, and the nitrification liquid in the water tank inlet 1 enters into sludge fermentation coupling denitrification reactor 5 by peristaltic pump 4.Flooding quantity is 5L, and peristaltic pump 4 flow set are 500ml/ minute, and flooding time is 10 minutes.
IV air inlet air inlet period intake valve 3 is opened, and peristaltic pump 4 works on.Outside air is driven into sludge fermentation coupling denitrification reactor 5 by peristaltic pump 4, reaches the purpose of removing ammonia nitrogen by nitrification.DO concentration in the assaying reaction device as 1. DO 〉=0.2mg/L or when 2. inlet period t＞20 a minute condition occurs, is closed intake valve 3 and peristaltic pump 4, enters next sequential.
The fermentative action of denitrification and the primary sludge of municipal effluent mainly occurs in this stage of V anoxia stirring.According to on-line monitoring pH and ORP, control stops constantly in the flex point of pH or ORP the anoxia stirring time, namely when 1. dpH/dt≤0 and t 〉=30 minute or when 2. d ORP/dt≤-50 and t 〉=30 minute occur, closes agitator 10, and the anoxia stirring period finishes.
It is 1 hour that the VI precipitation is set sedimentation time, and precipitate phase is finished mud-water separation.
VII draining outlet valve 8 is opened, and supernatant liquor enters water tank 9 through outlet pipeline.The draining ratio is 1/2, and water displacement is 5L.
VIII is idle, and to set idle mixing time be 2 hours, and discharge the 500ml mixed soil in this stage.
Embodiment two:
I adds the mud startup and adds dredge pump 7, squeezes into sludge fermentation coupling denitrification reactor 5 through the fresh primary sludge of dilution in the mud retention tank 6.It is 0.5L that the setting single adds the mud amount, and adding dredge pump 7 flows is 500ml/ minute, and adding the mud time is 5 minutes.
The II anaerobism stirs and sets the anaerobism churning time is 20 hours.Agitator 10 continuous firings during this.
III water inlet water intaking valve 2 and peristaltic pump 4 are opened, and the nitrification liquid in the water tank inlet 1 enters into sludge fermentation coupling denitrification reactor 5 by peristaltic pump 4.Flooding quantity is 5L, and peristaltic pump 4 flow set are 1L/ minute, and flooding time is 5 minutes.
IV air inlet air inlet period intake valve 3 is opened, and peristaltic pump 4 works on.Outside air is driven into sludge fermentation coupling denitrification reactor 5 by peristaltic pump 4, reaches the purpose of removing ammonia nitrogen by nitrification.DO concentration in the assaying reaction device as 1. DO 〉=0.2mg/L or when 2. inlet period t＞20 a minute condition occurs, is closed intake valve 3 and peristaltic pump 4, enters next sequential.
The fermentative action of denitrification and the primary sludge of municipal effluent mainly occurs in this stage of V anoxia stirring.According to on-line monitoring pH and ORP, control stops constantly in the flex point of pH or ORP the anoxia stirring time, namely when 1. dpH/dt≤0 and t 〉=30 minute or when 2. d ORP/dt≤-50 and t 〉=30 minute occur, closes agitator 10, and the anoxia stirring period finishes.
It is 2 hours that the VI precipitation is set sedimentation time, and precipitate phase is finished mud-water separation.
VII draining outlet valve 8 is opened, and supernatant liquor enters water tank 9 through outlet pipeline.The draining ratio is 1/2, and water displacement is 5L.
VIII is idle, and to set idle mixing time be 0.5 hour.And at this stage discharge 500ml mixed soil.
Test-results shows: the nitrification liquid after the municipal effluent aerobic treatment of dependents' district, Beijing is as processing object, the average 38mg/L of water inlet total nitrogen, the average 40mg/L of COD, primary sludge tunning have replenished the low C/N carbon source more required than municipal effluent denitrification, the water outlet NO of system
x -Almost nil; Along with system stable operation, strengthened the removal of ammonia nitrogen in sludge fermentation coupling denitrification system, system's nitrogen removal rate significantly improves, and the water outlet total nitrogen is down to below the 15mg/L, and ammonia nitrogen can be down to below the 5mg/L as shown in Figure 2.Municipal effluent one-level A emission standard is satisfied in this system's water outlet, is a kind of energy-conservation, efficient treatment process.
Claims (2)
1. the improved device of sequence batch (primary sludge fermentation coupling denitrification, it is characterized by the strengthened denitrification than municipal effluent for low C/N, comprise the water tank inlet (1), sludge fermentation coupling denitrification reactor (5), mud retention tank (6) and the water tank (9) that connect successively;
Wherein water tank inlet (1) links to each other with sludge fermentation coupling denitrification reactor (5) with peristaltic pump (4) by water intaking valve (2), and intake valve (3) links to each other with peristaltic pump (4); Agitator (10) is installed in the sludge fermentation coupling denitrification reactor (5), and the setting heating rod (11) and the temperature sensor (12) that link to each other with outside temperature control box (13); Gas extractor (14) is installed on sludge fermentation coupling denitrification reactor (5) top, and ORP on-line determination instrument (15) and pH on-line determination instrument (16) are installed in both sides; Mud retention tank (6) links to each other with sludge fermentation coupling denitrification reactor (5) by adding dredge pump (7), and sludge fermentation coupling denitrification reactor (5) links to each other with water tank (9) by outlet valve (8).
2. utilize the control method of the improved device of sequence batch (primary sludge fermentation coupling denitrification claimed in claim 1 mainly to may further comprise the steps:
It is the municipal effluent nitrification liquid through aerobic pretreatment in the water tank inlet (1), sludge fermentation coupling denitrification reactor (5) is alternately moving under the anaerobic-anoxic environment, take primary sludge as fermentation substrate, enrichment culture fermenting bacteria and denitrifying bacterium, per cycle is experienced successively and adds mud, anaerobism stirring, water inlet, air inlet, anoxia stirring, precipitation, draining, idle 8 sequential;
I adds the mud startup and adds dredge pump (7), and primary sludge is squeezed into sludge fermentation coupling denitrification reactor (5) in the mud retention tank (6); It is 1/20 of reactor useful volume that setting adds the mud volume, and the II anaerobism stirs and sets the anaerobism churning time is 9-20 hour; Agitator during this (10) continuous firing;
It is 1/2 of reactor useful volume that flooding quantity is set in the III water inlet; Water intaking valve (2) and peristaltic pump (4) are opened, and the nitrification liquid in the water tank inlet (1) enters into sludge fermentation coupling denitrification reactor (5) by peristaltic pump (4); IV air inlet air inlet period intake valve (3) is opened, and peristaltic pump (4) works on; Outside air is driven into sludge fermentation coupling denitrification reactor (5) by peristaltic pump (4), reaches the purpose of removing ammonia nitrogen by nitrification; DO concentration in the assaying reaction device as 1. DO 〉=0.2mg/L or when 2. inlet period t＞20 a minute condition occurs, is closed intake valve (3) and peristaltic pump (4), enters next sequential;
The fermentative action of denitrification and the primary sludge of municipal effluent mainly occurs in this stage of V anoxia stirring; According to on-line monitoring pH and ORP, control stops constantly in the flex point of pH or ORP the anoxia stirring time, namely when 1. dpH/dt≤0 and t 〉=30 minute or when 2. d ORP/dt≤-50 and t 〉=30 minute occur, closes agitator (10), and the anoxia stirring period finishes;
It is 1-2 hour that the VI precipitation is set sedimentation time, and precipitate phase is finished mud-water separation; It is 1/2 that the draining ratio is set in the VII draining, is controlled by time switch; Outlet valve (8) is opened, and supernatant liquor enters water tank (9) through outlet pipeline;
The idle draining of VIII finishes to begin to be defined as lay-up period to next cycle, and setting idle mixing time is 1-2 hour, and finishes spoil disposal in the idle stage; , the spoil disposal volume is 1/20 of reactor useful volume.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103241916A (en) * | 2013-05-12 | 2013-08-14 | 北京工业大学 | Method for realizing maximal accumulation of nitrite in sludge fermentation coupling denitrification process |
| CN106047938A (en) * | 2016-06-30 | 2016-10-26 | 清华大学深圳研究生院 | Method and device for producing energy substance nitrous oxide by denitrification |
| CN107021560A (en) * | 2017-06-09 | 2017-08-08 | 北京工业大学 | The method and apparatus for realizing sewerage short-cut nitration denitrification in SBR using sludge fermentation thing |
| CN113104977A (en) * | 2021-03-31 | 2021-07-13 | 大连海洋大学 | Method for strengthening endogenous denitrification of secondary sedimentation tank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103241916A (en) * | 2013-05-12 | 2013-08-14 | 北京工业大学 | Method for realizing maximal accumulation of nitrite in sludge fermentation coupling denitrification process |
| CN106047938A (en) * | 2016-06-30 | 2016-10-26 | 清华大学深圳研究生院 | Method and device for producing energy substance nitrous oxide by denitrification |
| CN107021560A (en) * | 2017-06-09 | 2017-08-08 | 北京工业大学 | The method and apparatus for realizing sewerage short-cut nitration denitrification in SBR using sludge fermentation thing |
| CN113104977A (en) * | 2021-03-31 | 2021-07-13 | 大连海洋大学 | Method for strengthening endogenous denitrification of secondary sedimentation tank |
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| CN103011406B (en) | 2014-07-02 |
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