CN101811803A - Rubbish leachate biological nitrogen removal process and device - Google Patents
Rubbish leachate biological nitrogen removal process and device Download PDFInfo
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Abstract
The invention relates to a rubbish leachate biological nitrogen removal process and a rubbish leachate biological nitrogen removal device. The process comprises the steps of water feeding, anaerobic biochemical treatment, primary anoxic denitrification, primary aerobic nitrification, secondary anoxic denitrification, secondary aerobic nitrification, MBR treatment and subsequent treatment. The device comprises an anaerobic tank, a primary anoxic denitrification tank, a primary aerobic nitrification tank, a secondary anoxic denitrification tank, a secondary aerobic nitrification tank and an MBR treatment device which are connected in turn through a water through pipeline, wherein a reflux pipe is led out from the primary aerobic nitrification tank to the primary anoxic denitrification tank; two reflux pipes led out from the MBR treatment device are connected to the primary and secondary anoxic denitrification tanks respectively; the anaerobic tank, the primary and secondary aerobic nitrification tanks and the MBR treatment device are connected with a sludge pipe respectively; the anaerobic tank is connected with a waste gas treatment device; the secondary anoxic denitrification tank is connected with a carbon supply device; and an aerating device is arranged in the primary and secondary aerobic nitrification tanks and the MBR treatment device respectively. The process can meet the requirement of GB16889-2008 'Domestic Rubbish Percolate (Leachate) Emission Limit' on nitrogen.
Description
Technical field
The present invention relates to a kind of treatment process and device of high concentration organic sewage, particularly about city refuse landfill rubbish leachate biological nitrogen removal process and device.
Background technology
Nitrogen in the water body, phosphorus are controlled, and are because it can cause the eutrophic pollution of water body, and especially the red algae in many marine sites, home and abroad tide pollutes; The algae in lake, river pollutes, and causes the pollution of peripheral tap water as prominent domestic Taihu Lake algae overgrowing, causes a sensation throughout the country, and these water pollution incidents cause that more each side must pay close attention to.
Percolate is the sewage of high density, complicated component, is the difficult problem of domestic and international field of water treatment to its processing.Remove in the percolate and contain a large amount of biodegradable organic contamination beyond the region of objective existences, also contain a large amount of biochemical organism that is difficult to.In addition, the evident characteristic of percolate is to contain a large amount of nitrogen-containing pollutants in the sewage, and along with the field of refuse landfill increases age, the biodegradability of percolate descends, wherein nitrogen content also increases, and nitrogen content is up to several thousand mg/litre in the general percolate, and the concentration ratio emission standard of nitrogen is wanted high hundreds of times, and the requirement of all contaminations processing standard is improving constantly, and this difficulty that just causes nitrogen-containing pollutant to handle is increasing.This specific character of percolate is brought multiple difficulty to processing, and this also becomes the difficult point that percolate is handled.
Along with Chinese economic development, more and more tighter for the control of environmental pollution, the sewage emissions standard is constantly adjusted in order to adapt to Economic development, and at the water quality of percolate from garbage filling field discharging, national, local proposition standard is also more and more stricter.At first, use GB8978-1996 " integrated wastewater discharge standard " control; At percolate from garbage filling field " consumer waste infiltration (drop) liquid emission limit " (GB16889-1997 " consumer waste filling and embedding pollution control criterion ") proposed specially to State Environmental Protection Administration in 1997.Water-quality guideline had only proposed 5 at that time, and divided three grades of controls (seeing Table 1) according to the situation of processing power, receiving water body.In July, 2008, State Environmental Protection Administration proposed higher standard, in GB16889-2008 " consumer waste filling and embedding pollution control criterion ", had proposed " consumer waste infiltration (drop) liquid emission limit " (seeing Table 2) again.The also corresponding proposition in Beijing's on July 8th, 2008 " about the bulletin of Beijing's household refuse landfill sites water pollutant discharging applied code related problems ".The provincial standard " household refuse landfill sites water pollutant emission concentration limit value table " (seeing Table 3) of Beijing has been proposed in the bulletin.(annotate: table 1, table 2, table 3 are listed the index of relevant nitrogen pollutant in the standard.)
In table 1GB16889-1997 " consumer waste filling and embedding pollution control criterion " " consumer waste infiltration (drop) liquid emission limit " about the index and the limit value of nitrogen
| The one-level limit value | The secondary limit value | Three grades of limit values | |
| Ammonia nitrogen | ??15 | ??25 | ???—— |
In table 2GB16889-2008 " consumer waste filling and embedding pollution control criterion " " consumer waste infiltration (drop) liquid emission limit " about the index and the limit value of nitrogen
The index and the limit value of the nitrogen that proposes in the table 32,008 8, on July " about the bulletin of Beijing's household refuse landfill sites water pollutant discharging applied code related problems "
| Sequence number | Pollutent | The one-level limit value | The secondary limit value | Three grades of limit values | The level Four limit value |
| ??5 | Total nitrogen (mg/L) | ??20 | ??40 | ??40 | ???—— |
| ??6 | Ammonia nitrogen (mg/L) | ??5.0 | ??10 | ??15 | ???—— |
The considerable change of these standards is: the water-quality guideline of control increases gradually, the requirement of every standard significantly improves, especially nitrogen, the phosphorus that can cause body eutrophication is proposed very high requirement, in the standard in 1997 nitrogen has only been proposed the standard of ammonia nitrogen: one-level: 15mg/L, secondary 25mg/L.2008 standards have also proposed restriction to total nitrogen, ammonia nitrogen: 25mg/L (sensitive area 8mg/L) except proposing the ammonia nitrogen standard; Total nitrogen: 40mg/L (sensitive area 20mg/L).
From then on as seen, different places, the different performed emission standards of receiving water body are different.In addition, if the water after handling is wanted reuse, will meet GB/T18920-2002 " city miscellaneous water water quality standard ".Only, except that the requirement of the Ministry of Construction, also have the local local reuse water standards of formulating according to local condition such as Beijing with regard to the reuse water standard.Because of the pollution problem to nitrogen, phosphorus in the water body in the recent period causes concern, still the effective treating method to nitrogen, phosphorus is not a lot, so Study on Processing Methods becomes focus.Physico-chemical process is generally adopted in the sewage disposal of present high nitrogen, and this method is to adjust earlier the pH value of sewage, and then with hot blast in denitrification column with ammonia-nitrogen desorption.This method not only facility investment in early stage is big, and the stripping ammonia nitrogen is diffused into the secondary pollution that causes in the atmosphere ambient air.The external a complete set of percolate treatment facility of 21 century China's introduction much because of nitrogen (ammonia nitrogen, total nitrogen) discharging exceeds standard, causes the treatment facility of these introductions out of service.In recent years adopt the application of biological denitrification method in city domestic sewage is handled, become the research focus, but experimental study is many, and practical application seldom.
Summary of the invention
At the problems referred to above, the objective of the invention is to propose a kind of rubbish leachate biological nitrogen removal process and device that can adapt to existing all kinds of new standards.
For achieving the above object, the present invention takes following technical scheme: a kind of rubbish leachate biological nitrogen removal process, and wherein, water treatment procedure comprises:
1) at first percolate is sent in the anaerobic jar, carries out anaerobic biological and handle;
2) the one-level denitrogenation processing is carried out in the water outlet after the anaerobic biological processing, comprising:
1. the processing of one-level anoxic denitrification is carried out in the water outlet after anaerobic biological being handled in proper order and the one-level aerobic nitrification is handled,
2. the sewage after the one-level aerobic nitrification being handled is back to the circulation of one-level anoxic denitrification jar again and carries out 1. step processing;
3) with step 2) water outlet after handling carries out the secondary denitrogenation processing in proper order, comprising:
1. the secondary anoxic denitrification is carried out in the water outlet after the one-level aerobic nitrification being handled in proper order and the secondary aerobic nitrification is handled,
2. the water outlet after the secondary aerobic nitrification being handled enters MBR, carries out mud, water sepn at MBR,
3. the sewage backflow after MBR being handled is back to one-level anoxic denitrification jar respectively and secondary anoxic denitrification jar carries out circular treatment,
4. water outlet that will be after MBR handles is extracted out by hollow-fibre membrane by suction pump, enters follow-up degree of depth film and handles;
Waste gas treatment process comprises:
Reclaim or light emptying after anaerobic biological in the step 1) being handled the biogas deodorizing that produces;
Sludge handling process comprises:
Mud, step 2 that anaerobic biological in the step 1) handle is produced) in the mud that produces of one-level aerobic nitrification process, step 3) secondary aerobic nitrification, MBR handle the mud discharging that produces to sludge sump.
In step 3), in one-level aerobic nitrification jar, secondary aerobic nitrification and MBR treater, replenish air by aerating apparatus.
When the secondary anoxic denitrification, in sewage, add in case of necessity and mend the carbon agent.
The reaction times in above-mentioned each stage requires:
The anaerobic reaction time: 50～100 hours,
The one-level anoxic denitrification time: 15～50 hours,
The one-level aerobic nitrification time: 50～100 hours,
The secondary anoxic denitrification time: 1.5～8 hours,
The secondary aerobic nitrification time: 2～10 hours.
A kind of garbage leachate biological denitrification apparatus that is applicable to described technology, it is characterized in that: it comprises anaerobic jar, one-level anoxic denitrification jar, one-level aerobic nitrification jar, secondary anoxic denitrification jar, secondary aerobic nitrification, the MBR treater that order connects by water-filled pipe, the water inlet pipe of the external percolate of described anaerobic jar, described MBR treater is external to enter water inlet pipe after the follow-up advanced treatment; Draw a sewage backflow pipeline tieback to described one-level anoxic denitrification jar from described one-level aerobic nitrification jar, described return line is provided with metering valve; Draw two sewage backflow pipelines from described MBR treater, tieback is respectively arranged with valve to described one-level anoxic denitrification jar and secondary anoxic denitrification jar on two described return lines respectively; The bottom of described anaerobic jar, one-level aerobic nitrification jar, secondary aerobic nitrification and MBR treater is connected a sludge pipe respectively, and described sludge pipe is connected to sludge sump; Described anaerobic jar connects emission-control equipment.
The external carbon compensator of described secondary anoxic denitrification jar.
Be respectively arranged with aerating apparatus in described one-level aerobic nitrification jar, secondary aerobic nitrification and the MBR treater, aerating apparatus links to each other with external blower.
The present invention is owing to take above technical scheme, and the present invention has the following advantages: 1, this treatment process is to adopt biological denitrificaion, makes the nitrogen in the sewage pass through biochemical action, changes into nitrogen and returns atmosphere, has avoided the physico-chemical process denitrogenation can cause secondary pollution.2, this treatment process is that denitrogenation is melted in the high-enriched organics biochemical treatment flow process, has avoided the materialization processing also need increase denitrogenation and has arranged, and has simplified the percolate treatment scheme, has saved facility investment; Also remove the materialization treating processes from and added the expense of medicament.3, adopted split type MBR in the device, ultra-filtration membrane can all be trapped in the suspended substance in the sewage, bacterium in the sewage after seeing through processing simultaneously in water outlet.This just can all be retained in nitrated, the denitrification flora in the sewage in the biochemical system of sewage disposal, has improved concentration nitrated, denitrifying activated sludge greatly, has reduced activated sludge loading, has improved the efficient of biochemical treatment.Also improved simultaneously the nitric efficiency of sewage.4, this treatment process since in can be in the anaerobic biological process with percolate itrogenous organic substance (as amino acid, uric acid etc.) change into ammonia nitrogen, and remove in, the denitrification nitrated at follow-up secondary, therefore not only has very strong ammonia nitrogen removal function, also there is very strong total nitrogen to remove function, makes the percolate after the processing can reach of the requirement of (GB16889-2008) standard ammonia nitrogen, total nitrogen.5, present method realizes control automatically by PLC (programmable logic controller) control water temperature, water level, the water yield, dissolved oxygen parameters such as (DO), can accomplish unmanned.Therefore technical process is stable, simple to operate, processing efficiency is high, effluent quality can reach relevant criterion.
Description of drawings
Fig. 1 is the one-level denitrification process schema of prior art
Fig. 2 is the schema of technology of the present invention
Fig. 3 is that major equipment of the present invention is arranged synoptic diagram
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1, in GB16889-1997 " consumer waste filling and embedding pollution control criterion ", rubbish leachate biological nitrogen removal process generally takes the one-level denitrogenation can reach standard-required, its basic craft course is: anaerobic biological → anoxic denitrification → aerobic nitrification → MBR handles → follow-up (nanofiltration membrane) processing, that is:
1) with pump percolate is sent in the anaerobic jar, carries out anaerobic biological and handle;
2) biogas that produces in the anaerobic biological treating processes is carried out recycling or light emptying after deodorizing is handled, and discharge the mud that produces in the anaerobic biological treating processes;
3) anoxic denitrification processing → aerobic nitrification processing → MBR film being carried out in the water outlet after the anaerobic biological processing in proper order handles;
4) in aerobic nitrification processing and MBR film treating processes, the aerating apparatus that utilizes gas blower to be provided with in aerobic jar and MBR treater is simultaneously sent into air, carries out aeration, and discharges the mud that produces in the aerobic nitrification treating processes;
5) sewage in the MBR treater is returned denitrification anoxic jar by reflux pump, carries out denitrification denitrogenation again; The water yield that refluxes is by the amount control of dissolved oxygen in the jar, and (oxygen concn is at 0.2mg/L～0.5mg/L) be as the criterion to keep dissolved oxygen to maintain anoxic condition.
6) water outlet after MBR handles is handled through subsequent film group (as nanofiltration) again, can guarantee to reach the requirement of GB16889-1997 " consumer waste filling and embedding pollution control criterion " to the discharging of ammonia nitrogen.
But, after new standard in 2008 is carried out, not only requiring ammonia nitrogen up to standard in the standard of draining, and require total nitrogen up to standard, the water outlet after above-mentioned technology is handled under many circumstances can not meet the demands.In order to address this problem, technology of the present invention has increased secondary denitrification flow process on the basis of original biological denitrificaion, and the content of nitrogen (comprising ammonia nitrogen, total nitrogen) in the percolate after the processing is further reduced, and reaches the requirement of present emission standard.Its typical process flow is: water inlet → anaerobic biological → one-level anoxic denitrification → one-level aerobic nitrification → secondary anoxic denitrification → secondary aerobic nitrification → MBR processing → follow-up (nanofiltration, reverse osmosis) processing →.Concrete steps are as shown in Figure 2:
1) at first percolate is sent in the anaerobic jar, carries out anaerobic biological and handle.
Merge because this denitrification process is other treatment process with high-concentration garbage percolate, so selection of process parameters also to be taken into account the biochemical treatment of high-enriched organics simultaneously except considering the requirement of biological denitrificaion; Anaerobic treatment is an important ring during percolate is handled, by a series of anaerobic biochemical reactions such as hydrolysis, acidifying, aerogenesis, large amount of organic is decomposed in the percolate, larger molecular organics resolves into small molecules and then changes into biogas, has removed organic pollutant in about 70% sewage, and improves the biodegradability of percolate, make competent organic carbon source is arranged in the sewage that enters the anoxic jar, organic carbon as electron donor, guarantees that denitrification carries out smoothly in the denitrification biochemical reaction.
The itrogenous organic substance that percolate is a large amount of resolves into ammonia-state nitrogen as amino acid, uric acid etc. under the effect of anerobe, removed in follow-up nitrated, the denitrification process that carries out, and so just greatly reduces total nitrogen content in the sewage.
Can produce biogas and mud during anaerobic biological is handled, biogas is carried out reclaiming or light emptying after deodorizing is handled; Mud regularly is discharged into sludge sump.
2) the one-level denitrogenation processing is carried out in the water outlet after the anaerobic biological processing, comprising:
1. the processing of one-level anoxic denitrification is carried out in the water outlet after anaerobic biological being handled in proper order and the one-level aerobic nitrification is handled;
2. the sewage recirculation after 1. the one-level aerobic nitrification is handled in the step with the is got back to one-level anoxic jar and is carried out the one-level anoxic denitrification and handle.
Because the water outlet in the step 1) after the anaerobic treatment does not contain dissolved oxygen substantially, the concentration of oxygen is generally greater than 2mg/L after the aerobic nitrification, and the dissolved oxygen concentration that the anoxic denitrification reaction requires is generally 0.2mg/L～0.5mg/L, if undertaken by nitrated → denitrifying order, then the oxygen concn in the anoxic denitrification jar can increase.Therefore, generally speaking, can be by above-mentioned steps 2) described process handles, and custom is called Prepositive denitrification on technology.Several strands of water that dissolved oxygen content is higher, such as step 2) sewage (dissolved oxygen concentration is generally greater than 2mg/L) and the higher water of follow-up oxygen level that 2. goes on foot after the one-level aerobic nitrification, be back to by a certain percentage and carry out the denitrification processing in the one-level anoxic jar, after agitator mixes, can make dissolved oxygen concentration be in 0.2mg/L～0.5mg/L, guarantee that denitrification carries out in anoxic condition.
Through above circular treatment, can make aerobic jar of nitric nitrogen (NO that comes in the water of one-level
2,-NO
3) under the effect of denitrifying bacteria, change into nitrogen, finish sewage water denitrification.
In the one-level denitrification process, for avoiding the under-supply of aerobic nitrification amount of oxygen, need in one-level aerobic nitrification jar, replenish air by aerating apparatus, to the consumption of dissolved oxygen, make to contain ammonia, the nitrated one-tenth nitric nitrogen of nitrogen pollutant (NO in the sewage when replenishing aerobic nitrification
2,-NO
3).
The mud that produces in the one-level aerobic nitrification process regularly is discharged into it in sludge sump.
3) the secondary denitrogenation processing is carried out in the water outlet after the above-mentioned one-level denitrogenation processing more in proper order, comprising:
1. the water outlet after the one-level denitrogenation processing being carried out in proper order secondary anoxic denitrification and secondary aerobic nitrification handles;
2. the water outlet after the secondary aerobic nitrification being handled is carried out MBR and is handled;
3. with dissolved oxygen concentration in the MBR treater high sewage be divided into two strands, be back to one-level anoxic jar respectively and secondary anoxic jar carries out circular treatment;
4. with in the hollow-fibre membrane of suction pump from be immersed in MBR water the water outlet after the MBR processing being extracted out, enter follow-up suitable film (nanofiltration membrane or reverse osmosis membrane) and handle, can reach the requirement of GB16889-2008 " consumer waste filling and embedding pollution control criterion ".
Above-mentioned steps 3) the 3. in the step, dissolved oxygen concentration is as the criterion at 0.2mg/L～0.5mg/L sewage backflow amount after MBR handles in the I and II denitrification sewage to keep, like this, as step 2) described, in the one-level anoxic jar, water outlet after anaerobic treatment, one-level aerobic nitrification recirculation water, three strands of water of MBR recirculation water, or wherein under the mixing of two strands of recirculation waters, with guarantee the one-level anoxic irritate in the concentration of dissolved oxygen just be in 0.2mg/L～0.5mg/L.
Amount of oxygen is under-supply when avoiding aerobic nitrification and MBR to handle, need in secondary aerobic nitrification and MBR treater, replenish air by aerating apparatus, the consumption of dissolved oxygen when replenishing aerobic nitrification makes remaining ammonia, the nitrogen material further nitrated one-tenth nitric nitrogen (NO in secondary nitrating pot, MBR treater that contains in the sewage
2,-NO
3); And there is the aeration bubble can cause the disturbance of sewage on MBR ultra-filtration membrane surface, the pollution that slows down ultra-filtration membrane in the MBR treater.
In the secondary anoxic denitrification was handled, except the denitrifying bacteria that needs existence under the anoxia condition worked, it was electron donor that the while anti-nitration reaction also needs competent organic carbon, so in the waste water enough carbon sources must be arranged, denitrification is carried out.Because percolate is through anaerobism, one-level aerobic nitrification, a series of biochemical action of one-level denitrification, organic carbon in the percolate may be not enough to provide denitrifying needs, so we have increased carbon compensator when the secondary anoxic denitrification, when carbon in the sewage is not enough, add benefit carbon agent (carbonaceous organic material is as flour, methyl alcohol etc.) so that anti-nitration reaction is abundant by this device.
The mud that produces during with above-mentioned secondary aerobic nitrification and MBR processing also regularly is discharged in the sludge sump.
Anaerobic biological of the present invention, the I and II anoxic denitrification, the process combination of I and II aerobic nitrification has not only been removed the organic pollutant in the water (COD, BOD) effectively, and has removed the very high nitrogen of content in the percolate effectively, makes the ammonia nitrogen in the water, the requirement that total nitrogen reaches standard.Technology essence of the present invention is exactly behind the one-level biological denitrificaion, and MBR adds one section anoxic denitrification and aerobic nitrification before handling again, promptly connects the two stage biological denitrogenation after the one-level biological denitrificaion, and the percolate after the processing enters follow-up film treatment process again.In technological process of the present invention, except that procedure arrangement as mentioned above, also on reaction times and oxygen level, made the regulation that comparatively is fit to:
Reaction times:
The anaerobic reaction time: 50～100 hours,
The one-level anoxic denitrification time: 15～50 hours,
The one-level aerobic nitrification time: 50～100 hours,
The secondary anoxic denitrification time: 1.5～8 hours,
The secondary aerobic nitrification time: 2～10 hours.
Dissolved oxygen concentration:
One-level anoxic denitrification oxygen level: 0.2～0.5mg/L,
One-level aerobic nitrification oxygen level: 〉=2.0mg/L,
Secondary anoxic denitrification oxygen level 0.2～0.5mg/L,
Secondary aerobic nitrification oxygen level: 〉=2.0mg/L.
As shown in Figure 3, by foregoing description as can be known, in the process implementing process, have the participation of current, airflow, sludge stream, clear in order to describe, below in conjunction with device current (comprise and mend the carbon agent), airflow, sludge stream are illustrated respectively.Because the applicant had applied for patent of invention before this: " a kind of garbage leachate treatment process ", the patent No.: ZL200810056984X, " a kind of garbage leachate treatment process and device ", application number: 200910084744.5; And multinomial utility model patent: " a kind of anaerobic process tank ", the patent No.: ZL200820079096.5, " a kind of film aerobe treater that is used for the percolate processing ", the patent No.: ZL 200820108654.6, " a kind of nanofiltration membrane device that is used for the processing for the treatment of refuse percolate ", the patent No.: ZL200820110306.2, so the present invention is for some existing devices and be connected this and do not do too much description.
Current:
Anaerobic jar 1, one-level anoxic denitrification jar 2, one-level aerobic nitrification jar 3, secondary anoxic denitrification jar 4, secondary aerobic nitrification 5, MBR treater 6, six are linked in sequence by water-filled pipe.The water inlet pipe of anaerobic jar 1 external percolate, MBR treater 6 connects the water inlet pipe of subsequent disposal through suction pump, enters follow-up advanced treatment.One-level aerobic nitrification jar 3 is by the sewage backflow pump, and tieback is to one-level anoxic denitrification jar 2 by the road; The sewage backflow pipeline of MBR treater 6 is connected respectively to one-level anoxic denitrification jar 2 and secondary anoxic denitrification jar 4 through reflux pump.Secondary anoxic denitrification jar 4 external carbon compensators 7.Particularly:
Percolate enters in the jar by the bottom of pipeline from secondary anoxic denitrification jar 4 after anaerobism, one-level anoxic denitrification, one-level aerobic nitrification are handled.If organic carbon content does not satisfy the denitrification requirement in the sewage, from carbon compensator 7, certain density organic carbon solution is squeezed in the secondary anoxic jar by volume pump 8.One-level anoxic denitrification jar 2, secondary anoxic denitrification jar 4 usefulness welded steel plates or build with Steel Concrete.In order to make the denitrification biochemical reaction evenly, fully in the anoxic denitrification jar, be provided with whipping appts 9.Because of whipping appts 9 is arranged, the sludge settling in the sewage is bad, and mud can not separate with sewage, so this kind jar is not established the mud discharging facility.
Sewage after the secondary denitrification is handled is flowed out by the top of secondary anoxic denitrification jar 4, enters through the bottom of water-filled pipe from secondary aerobic nitrification 5.Secondary aerobic nitrification 5 also is welded steel plate or builds with Steel Concrete.
Sewage through second nitrification flows out from the top of secondary aerobic nitrification 5, enters by the bottom of pipeline from immersion MBR treater 6.MBR treater 6 is the ponds of building with steel plate or reinforced concrete.The main effect of MBR is, by ultra-filtration membrane the active sludge in the sewage held back, and the sewage after denitrification denitrogenation is handled sees through hollow fiber ultrafiltration membrane, extracted out by the suction pump 10 that is located at tank deck, sends into follow-up film treatment process, does advanced treatment.
The bottom of one-level aerobic nitrification jar 3 connects a sewage backflow pipeline, and it is provided with reflux pump and valve 11, by reflux pump 11 sewage is extracted into the one-level anoxic denitrification jar 2 from one-level aerobic nitrification jar 3.The bottom of MBR treater 6 connects a total sewage backflow pipeline, and is provided with reflux pump 12 thereon, and total sewage backflow pipeline is divided into two branch lines endways, is connected respectively to the bottom of one-level anoxic denitrification jar 2 and secondary anoxic denitrification jar 4; Valve 13,14 is housed respectively on two branch lines.Sewage backflow is an important ring of pre-denitrification treatment process, and it is with the nitrated back of secondary nitric nitrogen (NO
2,-NO
3) turn back to preposition denitrification jar, under the effect of denitrifying bacteria, make nitric nitrogen change into nitrogen, finish the biological denitrificaion of sewage.
Airflow:
In one-level aerobic nitrification jar 3, secondary aerobic nitrification 5 and MBR treater 6, be respectively arranged with aerating apparatus 15,16,17.Gas blower 18 externally is set, links to each other with aerating apparatus 15,16,17 by pipeline.Air is sent by pipeline by gas blower 18, is sent to aerating apparatus 15,16,17 respectively, and aerating apparatus 15,16,17 becomes very tiny bubble to spill in one-level aerobic nitrification jar 3, secondary aerobic nitrification 5 and the MBR treater 6 air dispersion.The tiny bubble that the air of sending constantly into forms is dissolved in the sewage airborne oxygen, has improved the dissolution of contaminated water oxygen level, promotes that nitrifier changes into nitric nitrogen with ammonia nitrogen.There is the aeration bubble can also cause the disturbance of sewage on MBR ultra-filtration membrane surface, the pollution that slows down ultra-filtration membrane in the MBR treater 6.
The also outer emission-control equipment 19 that connects of anaerobic jar 1 carries out biogas to reclaim or light emptying after deodorizing is handled.
Sludge stream: biochemical treatment is the constantly metabolic biological process of special mushroom in the sewage.Pollutants in sewage constantly is eliminated in this ecosystem, flora in the sewage is constantly dead simultaneously, the flora of these inactivations has just formed inactive mud, dead mud is untimely gets rid of from biochemical treatment system for these, just influence biochemical system and handle the efficient of pollutent, therefore in time get rid of these mud, keep the metabolism of vigorous biochemical flora.Bottom at anaerobic jar 1, one-level aerobic nitrification jar 3, secondary aerobic nitrification 5 and MBR treater 6 is connected a sludge pipe respectively, regularly mud discharging is arrived sludge sump 20.
Following table is to handle and a water-quality ratio embodiment after the two stage biological denitrogenation processing through the one-level biological denitrificaion:
As can be seen from the table, the sewage nitrated through two-stage, that denitrification is handled, the content of ammonia, nitrogen conforms to current standards.
Claims (10)
1. rubbish leachate biological nitrogen removal process, wherein,
Water treatment procedure comprises:
1) at first percolate is sent in the anaerobic jar, carries out anaerobic biological and handle;
2) the one-level denitrogenation processing is carried out in the water outlet after the anaerobic biological processing, comprising:
1. the processing of one-level anoxic denitrification is carried out in the water outlet after anaerobic biological being handled in proper order and the one-level aerobic nitrification is handled,
2. the sewage after the one-level aerobic nitrification being handled is back to the circulation of one-level anoxic denitrification jar again and carries out 1. step processing;
3) with step 2) water outlet after handling carries out the secondary denitrogenation processing in proper order, comprising:
1. the secondary anoxic denitrification is carried out in the water outlet after the one-level aerobic nitrification being handled in proper order and the secondary aerobic nitrification is handled,
2. the water outlet after the secondary aerobic nitrification being handled enters MBR, carries out mud, water sepn at MBR,
3. the sewage backflow after MBR being handled is back to one-level anoxic denitrification jar respectively and secondary anoxic denitrification jar carries out circular treatment,
4. water outlet that will be after MBR handles is extracted out by hollow-fibre membrane by suction pump, enters follow-up degree of depth film and handles;
Waste gas treatment process comprises:
Reclaim or light emptying after anaerobic biological in the step 1) being handled the biogas deodorizing that produces;
Sludge handling process comprises:
Mud, step 2 that anaerobic biological in the step 1) handle is produced) in the mud that produces of one-level aerobic nitrification process, step 3) secondary aerobic nitrification, MBR handle the mud discharging that produces to sludge sump.
2. a kind of rubbish leachate biological nitrogen removal process as claimed in claim 1 is characterized in that: in step 3), replenish air by aerating apparatus in one-level aerobic nitrification jar, secondary aerobic nitrification and MBR treater.
3. a kind of rubbish leachate biological nitrogen removal process as claimed in claim 1 is characterized in that: when the secondary anoxic denitrification, add in sewage in case of necessity and mend the carbon agent.
4. a kind of rubbish leachate biological nitrogen removal process as claimed in claim 2 is characterized in that: when the secondary anoxic denitrification, add in sewage in case of necessity and mend the carbon agent.
5. as claim 1 or 2 or 3 or 4 described a kind of rubbish leachate biological nitrogen removal process, it is characterized in that: the reaction times requirement in each stage is:
The anaerobic reaction time: 50～100 hours,
The one-level anoxic denitrification time: 15～50 hours,
The one-level aerobic nitrification time: 50～100 hours,
The secondary anoxic denitrification time: 1.5～8 hours,
The secondary aerobic nitrification time: 2～10 hours.
6. as claim 1 or 2 or 3 or 4 described a kind of rubbish leachate biological nitrogen removal process, it is characterized in that: the dissolved oxygen concentration requirement in described each stage is:
One-level anoxic denitrification oxygen level: 0.2～0.5mg/L,
One-level aerobic nitrification oxygen level: 〉=2.0mg/L,
Secondary anoxic denitrification oxygen level 0.2～0.5mg/L,
Secondary aerobic nitrification oxygen level: 〉=2.0mg/L.
7. a kind of rubbish leachate biological nitrogen removal process as claimed in claim 5 is characterized in that: the dissolved oxygen concentration requirement in described each stage is:
One-level anoxic denitrification oxygen level: 0.2～0.5mg/L,
One-level aerobic nitrification oxygen level: 〉=2.0mg/L,
Secondary anoxic denitrification oxygen level 0.2～0.5mg/L,
Secondary aerobic nitrification oxygen level: 〉=2.0mg/L.
8. one kind is applicable to the garbage leachate biological denitrification apparatus as technology as described in one of claim 1～7, it is characterized in that: it comprises anaerobic jar, one-level anoxic denitrification jar, one-level aerobic nitrification jar, secondary anoxic denitrification jar, secondary aerobic nitrification, the MBR treater that order connects by water-filled pipe
The water inlet pipe of the external percolate of described anaerobic jar, described MBR treater is external to enter water inlet pipe after the follow-up advanced treatment;
Draw a sewage backflow pipeline tieback to described one-level anoxic denitrification jar from described one-level aerobic nitrification jar, described return line is provided with metering valve;
Draw two sewage backflow pipelines from described MBR treater, tieback is respectively arranged with valve to described one-level anoxic denitrification jar and secondary anoxic denitrification jar on two described return lines respectively;
The bottom of described anaerobic jar, one-level aerobic nitrification jar, secondary aerobic nitrification and MBR treater is connected a sludge pipe respectively, and described sludge pipe is connected to sludge sump;
Described anaerobic jar connects emission-control equipment.
9. garbage leachate biological denitrification apparatus as claimed in claim 8 is characterized in that: the external carbon compensator of described secondary anoxic denitrification jar.
10. garbage leachate biological denitrification apparatus as claimed in claim 8 is characterized in that: be respectively arranged with aerating apparatus in described one-level aerobic nitrification jar, secondary aerobic nitrification and the MBR treater, aerating apparatus links to each other with external blower.
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