CN104326559B - System for strengthening post-denitrification denitrogenation process - Google Patents

System for strengthening post-denitrification denitrogenation process Download PDF

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CN104326559B
CN104326559B CN201410525548.8A CN201410525548A CN104326559B CN 104326559 B CN104326559 B CN 104326559B CN 201410525548 A CN201410525548 A CN 201410525548A CN 104326559 B CN104326559 B CN 104326559B
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gas
ponds
aeration
denitrification
pond
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CN104326559A (en
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吴睿
彭禹
洪超
陈丹
杨昉婧
李道进
沈明霞
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Nanjing Institute of Environmental Sciences MEP
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Nanjing Institute of Environmental Sciences MEP
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Abstract

The present invention discloses a system for strengthening a post-denitrification denitrogenation process. The system comprises a landfill gas inlet pipe, a nitrification strengthening tank (IN tank), a deaerator, a denitrification strengthening tank (ID tank) and a sedimentation tank, wherein the IN tank adopts landfill gas to aerate, the ID tank adopts the landfill gas with the oxygen removed by the deaerator to aerate, the length of the IN tank aeration pipe extending into the IN tank is 2/3 of the length of the tank, the IN tank and the ID tank are separated by a separation wall, the distance between the separation wall and the tank bottom is 1/5 of the height of the tank, the mixed ratio of the landfill gas to the air in the IN tank is 2:1-4:1, the internally circulated gas ratio in the IN tank is 50-80%, the internally circulated gas ratio in the ID tank is 70-90%, and the pre-acclimatization times of the microorganisms in the IN tank and the ID tank are 3-5 d. The system of the present invention has characteristics of high denitrogenation efficiency, stable treatment effect, simple process, less treatment structure and equipment, low infrastructure construction and operation cost, and the like.

Description

A kind of system for strengthening rear-mounted denitrification denitrification process
Technical field
The present invention relates to a kind of system of enhanced biological stress efficacy of water-treatment technology field, in particular, is one Plant the system (IN-ID systems) for being used to strengthening rear-mounted denitrification denitrification.
Background technology
Rear-mounted denitrification denitrification process is also called single-stage biological nitrogen removal technique (as shown in Figure 1).The removal of organic pollution Carry out in same reactor (Aeration tank) with ammonifying process, nitration reaction, the mixed liquor flowed out from the reactor without precipitation, Anoxic pond is directly entered, denitrification is carried out.The technological process is simple, processes structures and equipment is less, overcome multi-stage biological The drawbacks common of denitrification system.But it is not enough to still suffer from the possible basicity of the intrinsic shortcoming of rear-mounted denitrification, i.e. nitrifying process, anti-nitre Change process carbon source is not enough, and integrated artistic nitric efficiency is segmented not as good as preposition anaerobic-aerobic (A/O) denitrification process and Anoxic/Aerobic Water inlet denitrification process, in addition, which there is also the common drawback of biological treatment, i.e. temperature influence is larger, such as winter During operation, treatment effeciency is substantially reduced.
Landfill gas (LFG) are mainly product of the biodegradable organic under microbial action in landfill waste.Mainly Composition is methane (CH4), carbon dioxide (CO2), nitrogen (N2), oxygen (O2) etc., proportion respectively 45%~60%, 40%~60%, 2%~5%, 0.1%~1.0%.Methane (CH4) and carbon dioxide (CO2) as two kinds of most important greenhouses Gas, is the main study subject of landfill yard reduction of greenhouse gas discharge.At present, landfill gas (LFG) collection system and covering are autochthonal Thing oxidation is the Main Means of landfill boat reduction of greenhouse gas discharge, overburden soil biological oxidation by rubbish surface mulching soil layer, Greenhouse gases release is reduced by soil microorganism oxidation, but its reduction of discharging is limited in one's ability, and affected very big by meteorological condition;Landfill Gas collection system is collected to gas and is collected by the pipeline laid inside, is affected less by meteorological condition, but is filled Gas component is more, limits its use value in recycling.
The nitrification and denitrification effect of microorganism is the core process of biological denitrificaion.Nitrification refers to that ammonia is made in microorganism The process of nitric acid is oxidized to under.Denitrification is also referred to as denitrification, refers to denitrifying bacteria under anoxic conditions, reduces nitre Hydrochlorate, discharges molecular nitrogen (N2) or nitrous oxide (N2O process study) shows:1)NH4 +And CH4Positive tetrahedron point Minor structure is similar to, and molecular weight is close, and methane mono-oxygenase and ammonia mono-oxygenase are also very much like in structure, therefore ammoxidation Bacterium and methane-oxidizing bacteria can aoxidize NH4 +, and methane-oxidizing bacteria is with CH4As the energy and carbon source;2)CH4Anaerobic oxidation is scarce Important biochemical reaction, NO in oxygen environment2 -Or NO3 -Equally can be used as CH4The electron acceptor of anaerobic oxidation, can with chemical equation To be expressed as:
5CH4+8NO3 -+8H+→5CO2+4N2+14H2O (1)
(G ° '=- 765kJ mol-1CH4)
3CH4+8NO2 -+8H+→3CO2+4N2+10H2O (2)
(G ° '=- 928 kJ mol-1CH4)
But, existing not enough with the presence of rear-mounted denitrification denitrification process denitrification process carbon source, integrated artistic denitrogenation effect Rate is relatively low, and is difficult to further improve, and the low problem for the treatment of effeciency is run under the conditions of winter low temperature.
The content of the invention
The present invention is for above-mentioned deficiency present in prior art, there is provided a kind of to be used to strengthen rear-mounted denitrification denitrogenation work The system (IN-ID systems) of skill, for city domestic sewage, the more conventional rear-mounted denitrification denitrification process of its TN clearance improves 25%~37%;For waste water of livestock poultry, the more conventional rear-mounted denitrification denitrification process of its TN clearance improves 34%~41%;It is de- Nitrogen effect is close to anaerobic-aerobic (A/O) denitrification process and anaerobic-aerobic segmental influent denitrification process.After the system reinforcing Rear-mounted denitrification denitrification process have nitric efficiency high, treatment effect is stable, and technological process is simple, processes structures and equipment It is less, capital construction and the low feature of operating cost.
In order to realize above-mentioned technical purpose, the present invention is achieved by the following technical solutions.
A kind of system for strengthening rear-mounted denitrification denitrification process, including:Landfill gas air inlet pipe 1, reinforcing nitrification tank (IN Pond) 2, degasifier 3, intensified anti-nitrated pond (ID ponds) 4 and sedimentation tank 5;Reinforcing nitrification tank 2 and intensified anti-nitrated pond 4 are formed instead Area is answered, and strengthens nitrification tank 2 and connected with 4 bottom of intensified anti-nitrated pond, and lay aeration tube 18 respectively, on the pipeline of aeration tube 18 It is evenly equipped with aeration head 9;The top of reinforcing nitrification tank 2 arranges IN ponds gas inner circulating tube 6 and IN ponds exhaustor 14, intensified anti-nitrated The top in pond 4 arranges ID ponds gas inner-outer circulations pipe 11, is wherein configured with IN ponds gas interior circulation on IN ponds gas inner circulating tube 6 Pump 19, is configured with ID ponds gas internal circulation pump 20 and ID ponds gas cardiopulmonary bypass pump 13 on ID ponds gas inner-outer circulations pipe 11;Deoxidation Device 3 is connected with landfill gas air inlet pipe 1 and ID ponds gas inner-outer circulations pipe 11 respectively by deoxidation air inlet pipe 12;Landfill gas air inlet pipe On be connected with IN ponds gas inner circulating tube 6, air intake duct 10 and deoxidation air inlet pipe 12;Sedimentation tank 6 by connecting tube 17 with it is strong Change denitrification pond 4 to connect, the sludge of sedimentation tank 6 is back to reinforcing nitrification tank 2 by mud return line 8.
Preferably, in the reinforcing nitrification tank 2 and intensified anti-nitrated pond 4, the gas that adopted of aeration is landfill gas, its In, the landfill gas into intensified anti-nitrated pond 4 carry out deoxidation treatment through degasifier 3.
Preferably, the degasifier 3 includes electric furnace heating wire 21 and copper mesh 22, forms high temperature by 21 heat production of electric furnace heating wire and adds Hot copper mesh 22, landfill gas deoxidation after scorching hot copper mesh 22.
Preferably, separated by dividing wall 38 between the reinforcing nitrification tank 2 and intensified anti-nitrated pond 4
Preferably, it is strengthen 2 pond length of nitrification tank 2/3 that the IN ponds aeration tube 37 of reinforcing nitrification tank 2 stretches into length in pond;Point Partition wall 38 is high 1/5 in pond away from bottom of pond distance.
Preferably, in the reinforcing nitrification tank 2 mixing ratio of landfill gas and air between 2: 1~4: 1;IN ponds gas In inner circulating tube 6, the gas ratio of interior circulation is 50%~80%;The gas ratio of gas interior circulation in ID ponds inner-outer circulations pipe 11 Example is 70%-90%.
Preferably, the reinforcing nitrification tank 2 and intensified anti-nitrated pond 4 adopt intermittent aeration mode, and aeration period is 12h。
Preferably, the aeration process in reinforcing 2 a cycle of nitrification tank is:
(1) the gaseous mixture aeration 50min of landfill gas and air, stands 10min, and the process duration is 1h;
(2) flow back gas cyclic aeration and air aeration carries out 50min altogether, stands 10min, aeration and stands alternately, The process duration is 11h.
Preferably, the aeration process in 4 a cycle of intensified anti-nitrated pond is:
Landfill gas aeration 50min after deoxidation, stands 10min, and alternately, the process duration is for aeration and standing 12h。
Preferably, strengthen the pre- domestication time of sludge in nitrification tank 2 and intensified anti-nitrated pond 4 between 3-5d.
Provided by the present invention for the system for strengthening rear-mounted denitrification denitrification process, its course of work comprises the steps:
(1) tame the stage in advance:
On the basis of original sludge, raw water Jing water inlet pipe 7 enters reinforcing nitrification tank IN ponds, reaches certain volume V1Afterwards, Stop water inlet, while Open valve l36, valve g31, valve h32 and valve i33, IN pond 2 and ID ponds 4 are Jing after 3-5d domestications Processing stage can entering, domestication stage aeration adopts batch (-type).Aeration flow process in 2 a cycle of IN ponds is:1. landfill gas, sky Gas gaseous mixture aeration 50min, stands 10min, and the process duration is 1h;2. flow back gas cyclic aeration, air aeration simultaneously 50min, stands 10min, and aeration and standing exchange are carried out, and the process duration is 11h;Aeration in 4 a cycle of ID ponds Flow process is:Landfill gas deoxidation aeration 50min, stands 10min, and aeration and standing exchange are carried out, and the process duration is 12h. After domestication terminates,
(2) processing stage:
1., after the pre- domestication stage, raw water is with certain flow q1Jing water inlet pipes 7 enter reinforcing nitrification tank IN ponds, while opening Opening valve l36, valve g31, valve h32, valve i33 and valve j34 carries out aeration, a part of landfill gas Jing landfill gas air inlet pipe 1 presses certain flow Q1Into IN ponds 2, and by 9 uniform air inlet of aeration head;Another part landfill gas Jing deoxidation air inlet pipe 12 enters de- Oxygen device 3, the oxygen in landfill gas are reacted so as to take off oxygen therein with scorching hot copper mesh 22, and this process relies on electric furnace heating wire 21 Heated, the temperature after heating is maintained at 400~500 DEG C, the landfill gas of Jing deoxidations enter ID ponds by ID ponds aeration tube 18 4, also rely on 9 uniform air inlet of aeration head;
Aeration flow process in 2 a cycle of 2.IN ponds is:1. landfill gas, air Mixture aeration 50min, stand 10min, Open when the process duration is 1h, valve j34 and valve l36 aerations, close during standing, the mixing ratio of landfill gas and air Between 2: 1~4: 1;2. flow back gas cyclic aeration, air aeration 50min simultaneously, stands 10min, and aeration and standing are exchanged Carry out, the process duration be 11h, valve l36 close, when valve k35, valve l5 and valve b26 aerations open, during standing Close, in IN ponds gas inner circulating tube 6, the gas ratio of interior circulation is 50%~80%;
Aeration flow process in 4 a cycle of 3.ID ponds is:Landfill gas deoxidation aeration 50min, stands 10min, aeration and quiet Putting exchange is carried out, and the process duration is 12h, is opened when valve g31, valve h32, valve i33 and valve j34 aerations, quiet Close when putting, in ID ponds inner-outer circulations pipe 11, the gas ratio of gas interior circulation is 70%-90%.
Gas interior circulation in interior circulation in 4.IN ponds gas inner circulating tube 6 and ID ponds inner-outer circulations pipe 11 is relied on respectively IN ponds internal circulation pump 19 and ID ponds internal circulation pump 20;When in landfill gas, methane concentration is low, by Open valve f30, valve G31 and valve j34, by ID ponds gas inner circulating tube 11, carries out outer circulation by ID ponds outer circulation pump 13, to improve landfill gas Air inlet methane concentration.
After 5.IN ponds 2 complete the gas explosion effect of a cycle, while opening valve l5 and valve b26, gas in IN ponds 2 is discharged Body;After ID ponds 4 complete the gas explosion effect of a cycle, while opening valve c27 and valve d28, and valve e29 discharge ID are closed Gas in pond 4.Aerofluxuss accelerate aerofluxuss by landfill gas aeration simultaneously, and evacuation time is 2min.
6. the water Jing after ID ponds 4 enters sedimentation tank 5 by connecting tube 17, and clarifier sludge part passes through mud return line 8 IN ponds 2 are back to, water after precipitation is denitrogenation water outlet.
Compared with prior art, the present invention has following beneficial aspects:
1) pre- domestication and operation are carried out by the gaseous mixture of landfill gas and air is passed through into IN ponds 2, in landfill gas and sky The mixing ratio of gas is in the case of 2: 1~4: 1, it is ensured that the aerobic environment in pond, while the methane in landfill gas is methane Oxidation bacteria provides the energy and carbon source, enhances the nitrification activity of aerobic methane-oxidizing bacteria and aerobic ammonia-oxidizing bacteria in pond, enriches Population quantity, so as to enhancing Nitrification.
2) carry out pre- domestication and operation by the landfill gas after deoxidation being passed through into ID ponds 4, under conditions of anaerobism, strengthen In pond, the nitrification activity of anaerobic methane oxidation bacterium and anaerobic ammonia oxidizing bacteria, enriches the population quantity of two quasi-microorganisms, passes through Anaerobic methane oxidation coupling denitrification is acted on, and enhances denitrification denitrogenation efficiency.
3) by the gas interior circulation reinforcing in the interior circulation in IN ponds gas inner circulating tube 6 and ID ponds inner-outer circulations pipe 11 Effectively utilizes to landfill gas;The air inlet of landfill gas air inlet pipe 1 ensure that by the outer circulation of ID ponds gas inner circulating tube 11 Methane concentration.
4) it is because being filled with substantial amounts of methane and carbon dioxide greenhouse gases in IN ponds 2 and ID ponds 4 and viscous by tack coat 23 Knot external insulation material expand styrofoam 24, ensure that winter by the greenhouse effect and insulation material insulation effect of greenhouse gases Operation treatment effeciency under cryogenic conditions.
5) ID ponds 4 carry out Denitrification by anaerobic methane oxidation bacterium and anaerobic ammonia oxidizing bacteria simultaneously, play a leading role Be excellent anaerobic methane oxidation bacterium, and anaerobic methane oxidation bacterium provides carbon source and the energy by methane, therefore is not required to additional carbon, solves The problem of the denitrification process carbon source deficiency that rear-mounted denitrification denitrification process of having determined is present.
6) because of the increase of microbial population, the BOD clearances in IN ponds 2 and ID ponds 4 have also obtained certain raising.
Provided by the present invention for the system for strengthening rear-mounted denitrification denitrification process, with nitric efficiency height, treatment effect Stable, technological process is simple, process structures and equipment is less, capital construction and the low feature of operating cost.
Description of the drawings
Detailed description non-limiting example made with reference to the following drawings by reading, the further feature of the present invention, Objects and advantages will become more apparent upon:
Fig. 1 is existing rear-mounted denitrification denitrification process.
Fig. 2 is present invention process schematic flow sheet.
Fig. 3 is the structural representation of B-B section views of the present invention.
Fig. 4 is IN ponds of the present invention and ID ponds insulation construction schematic diagram.
Fig. 5 is overall structure effect diagram of the present invention.
In figure:1 is landfill gas air inlet pipe;2 are reinforcing nitrification tank (IN ponds);3 is degasifier;4 is intensified anti-nitrated pond (ID Pond);5 is sedimentation tank;6 is IN ponds gas inner circulating tube;7 is water inlet pipe;8 is mud return line;9 is aeration head;10 is air Air inlet pipe;11 is ID ponds gas inner circulating tube;12 is deoxidation air inlet pipe;13 is ID ponds outer circulation pump;14 is IN ponds exhaustor;15 For ID ponds exhaustor;16 is ID ponds gas combustion pipe;17 is connecting tube;18 is ID ponds aeration tube;19 is IN ponds internal circulation pump;20 For ID ponds internal circulation pump;21 is electric furnace heating wire;22 is copper mesh;23 is tack coat;24 is expansion polyphenyl plate;25 is valve a;26 is valve Door b;27 is valve c;28 is valve d;29 is valve e;30 is valve f;31 is valve g;32 is valve h;33 is valve i;34 For valve j;35 is valve k;36 is valve l;37 is IN ponds aeration tube;38 is dividing wall;39 is control line;40 is Valve controlling Center.
Specific embodiment
Below embodiments of the invention are elaborated:The present embodiment is carried out under premised on technical solution of the present invention Implement, give detailed embodiment and specific operating process.It should be pointed out that to one of ordinary skill in the art For, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these belong to the guarantor of the present invention Shield scope.
This specific embodiment provides a kind of system for strengthening rear-mounted denitrification denitrification process, including:Landfill gas Air inlet pipe 1, reinforcing nitrification tank (IN ponds) 2, degasifier 3, intensified anti-nitrated pond (ID ponds) 4 and sedimentation tank 5;Reinforcing nitrification tank 2 Reaction zone is formed with intensified anti-nitrated pond 4, and strengthens nitrification tank 2 and connected with 4 bottom of intensified anti-nitrated pond, and lay aeration respectively Pipe 18, is evenly equipped with aeration head 9 on the pipeline of aeration tube 18;The top of reinforcing nitrification tank 2 arranges IN ponds gas inner circulating tube 6 and IN Pond exhaustor 14, the top in intensified anti-nitrated pond 4 arrange ID ponds gas inner-outer circulations pipe 11, wherein IN ponds gas inner circulating tube 6 On be configured with IN ponds gas internal circulation pump 19, ID ponds gas internal circulation pump 20 and ID are configured with ID ponds gas inner-outer circulations pipe 11 Pond gas cardiopulmonary bypass pump 13;Degasifier 3 by deoxidation air inlet pipe 12 respectively with landfill gas air inlet pipe 1 and ID ponds gas inner-outer circulation Pipe 11 connects;IN ponds gas inner circulating tube 6, air intake duct 10 and deoxidation air inlet pipe 12 are connected with landfill gas air inlet pipe;It is heavy Shallow lake pond 6 is connected with intensified anti-nitrated pond 4 by connecting tube 17, and the sludge of sedimentation tank 6 is back to reinforcing nitre by mud return line 8 Change pond 2.
Further, in the reinforcing nitrification tank 2 and intensified anti-nitrated pond 4, the gas that adopted of aeration is landfill gas, Wherein, the landfill gas into intensified anti-nitrated pond 4 carry out deoxidation treatment through degasifier 3.
Further, the degasifier 3 includes electric furnace heating wire 21 and copper mesh 22, forms high temperature simultaneously by 21 heat production of electric furnace heating wire Heating copper mesh 22, landfill gas deoxidation after scorching hot copper mesh 22.
Further, strengthen nitrification tank (IN ponds) 2 and intensified anti-nitrated pond (ID ponds) 4 be respectively provided with gas internal reflux pipeline, Respectively IN ponds gas inner circulating tube 6 and ID ponds gas inner-outer circulations pipe 11, improve the utilization ratio of landfill gas with this.
Further, system carries out outer circulation by arranging ID ponds gas inner-outer circulations pipe 11, is entered with this stable landfill gas The air inlet CH4 concentration of trachea 1.
Further, separated by dividing wall 38 between the reinforcing nitrification tank 2 and intensified anti-nitrated pond 4
Preferably, it is strengthen 2 pond length of nitrification tank 2/3 that the IN ponds aeration tube 37 of reinforcing nitrification tank 2 stretches into length in pond;Point Partition wall 38 is high 1/5 in pond away from bottom of pond distance.
Further, in the reinforcing nitrification tank 2 mixing ratio of landfill gas and air between 2: 1~4: 1;IN ponds gas In body-internal-circulation pipe 6, the gas ratio of interior circulation is 50%~80%;The gas of gas interior circulation in ID ponds inner-outer circulations pipe 11 Ratio is 70%-90%.
Further, the reinforcing nitrification tank 2 and intensified anti-nitrated pond 4 adopt intermittent aeration mode, aeration period For 12h.
Further, the aeration process in reinforcing 2 a cycle of nitrification tank is:
(1) the gaseous mixture aeration 50min of landfill gas and air, stands 10min, and the process duration is 1h;
(2) flow back gas cyclic aeration and air aeration carries out 50min altogether, stands 10min, aeration and stands alternately, The process duration is 11h.
Further, the aeration process in 4 a cycle of intensified anti-nitrated pond is:
Landfill gas aeration 50min after deoxidation, stands 10min, and alternately, the process duration is for aeration and standing 12h。
Further, strengthen the pre- domestication time of sludge in nitrification tank 2 and intensified anti-nitrated pond 4 between 3-5d.
To further appreciate that the content of this specific embodiment, it is described in detail below in conjunction with the accompanying drawings.
As shown in Fig. 2 a kind of system for strengthening rear-mounted denitrification denitrification process that this specific embodiment is provided (IN-ID systems), including landfill gas air inlet pipe 1, reinforcing nitrification tank (IN ponds) 2, degasifier 3, intensified anti-nitrated pond (ID ponds) 4, Sedimentation tank 5;Reaction zone is mainly made up of reinforcing nitrification tank IN ponds 2 and intensified anti-nitrated pond ID ponds 4, and 2 connect with 4 bottoms, all Aeration tube 18 is laid, aeration head 9 on pipeline, is evenly equipped with;The top in IN ponds 2 arranges IN ponds gas inner circulating tube 6 and IN ponds exhaustor The top in 14, ID ponds 4 arranges ID ponds gas inner-outer circulations pipe 11, wherein be respectively configured on 6 and 11 IN ponds gas internal circulation pump 19, ID ponds gas internal circulation pump 20 and ID ponds gas cardiopulmonary bypass pump 13;Degasifier 3 is mainly made up of electric furnace heating wire 21 and copper mesh 22, is led to Cross deoxidation air inlet pipe 12 and landfill gas air inlet pipe 1 and ID ponds gas inner-outer circulations pipe 11 connects;It is connected with landfill gas air inlet pipe IN ponds gas inner circulating tube 6, air intake duct 10 and deoxidation air inlet pipe 12;Sedimentation tank 6 passes through connecting tube 17 and intensified anti-nitrated Pond ID ponds 4 connect, and the sludge of sedimentation tank 6 is back to reinforcing nitrification tank IN ponds 2 by mud return line 8.
In reinforcing nitrification tank IN ponds 2 and intensified anti-nitrated pond ID ponds 4 gas adopted by aeration is landfill gas, difference Place is that degasifier 3 is stripped of oxygen into the landfill gas in intensified anti-nitrated pond ID ponds 4, and removing oxygen is to exclude landfill Impact of the oxygen to anaerobic environment in ID ponds 4 in gas.
Degasifier 3 forms high temperature using 21 heat production of electric furnace heating wire and heats copper mesh 22, and landfill gas are through scorching hot copper mesh Deoxidation after 22, copper at high temperature can be with oxygen reactions so as to deviating from oxygen.
Reinforcing nitrification tank IN ponds 2 and intensified anti-nitrated pond ID ponds 4 are respectively provided with gas internal reflux pipeline, respectively IN ponds gas Inner circulating tube 6 and ID ponds gas inner-outer circulations pipe 11, improve the utilization ratio of landfill gas with this.
System carries out outer circulation by arranging ID ponds gas inner-outer circulations pipe 11, with entering for this stable landfill gas air inlet pipe 1 Gas CH4Concentration.
IN ponds aeration tube 37 in reinforcing nitrification tank IN ponds 2 stretches into length for IN Chi2Chi length 2/3 in pond;IN ponds 2 and ID Pond 4 is separated by dividing wall 38, and dividing wall 38 is high 1/5 in pond away from bottom of pond distance, in just can guarantee that ID ponds 4 under here height Anaerobic environment and denitrification denitrogenation effect;
In IN ponds 2, the mixing ratio of landfill gas and air is between 2: 1~4: 1;Interior circulation in IN ponds gas inner circulating tube 6 Gas ratio be 50%~80%, greenhouse gases in IN ponds 2 are just can guarantee that under this ratio heats effect;ID is followed inside and outside pond In endless tube 11, the gas ratio of gas interior circulation is 70%-90%, and the increasing of greenhouse gases in ID ponds 4 is just can guarantee that under this ratio Temp effect;
IN ponds 2 and ID ponds 4 adopt intermittent aeration, and the cycle is 12h, and the aeration flow process in 2 a cycle of IN ponds is:① Landfill gas, air Mixture aeration 50min, stand 10min, and the process duration is 1h;2. flow back gas cyclic aeration, air Aeration 50min, stands 10min, and aeration and standing exchange are carried out, and the process duration is 11h;In 4 a cycle of ID ponds Aeration flow process is:Landfill gas deoxidation aeration 50min, stands 10min, and aeration and standing exchange are carried out, and the process duration is 12h, aeration time and time of repose ratio be 5: 1 under conditions of can ensure treatment effect under conditions of ensure delivery turbidity;
In IN ponds 2 and ID ponds 4, the pre- domestication time of microorganism, between 3-5d, can meet under the here domestication time and tame and docile Change effect.
The above-mentioned system for strengthening rear-mounted denitrification denitrification process, its step is:
A) tame the stage in advance:On the basis of original sludge, raw water Jing water inlet pipe 7 enters reinforcing nitrification tank IN ponds, reaches Certain volume V1Afterwards, stop water inlet, while Open valve l36, valve g31,4 Jing of valve h32 and valve i33, IN pond 2 and ID ponds Processing stage can entering after 3-5d domestications, domestication stage aeration adopts batch (-type).Aeration flow process in 2 a cycle of IN ponds For:1. landfill gas, air Mixture aeration 50min, stand 10min, and the process duration is 1h;2. the gas circulation that flows back exposes Gas, air simultaneously aeration 50min, stands 10min, aeration and stands exchange and carries out, and the process duration is 11h;ID ponds 4 one Aeration flow process in the individual cycle is:Landfill gas deoxidation aeration 50min, stands 10min, and aeration and standing exchange are carried out, the process Persistent period is 12h.After domestication terminates,
B) processing stage:
1st, after the pre- domestication stage, raw water is with certain flow q1Jing water inlet pipes 7 enter reinforcing nitrification tank IN ponds, while opening Opening valve l36, valve g31, valve h32, valve i33 and valve j34 carries out aeration, a part of landfill gas Jing landfill gas air inlet pipe 1 presses certain flow Q1Into IN ponds 2, and by 9 uniform air inlet of aeration head;Another part landfill gas Jing deoxidation air inlet pipe 12 enters de- Oxygen device 3, the oxygen in landfill gas are reacted so as to take off oxygen therein with scorching hot copper mesh 22, and this process relies on electric furnace heating wire 21 Heated, the temperature after heating is maintained at 400~500 DEG C, the landfill gas of Jing deoxidations enter ID ponds by ID ponds aeration tube 18 4, also rely on 9 uniform air inlet of aeration head;
2nd, the aeration flow process in 2 a cycle of IN ponds is:1. landfill gas, air Mixture aeration 50min, stand 10min, Open when the process duration is 1h, valve j34 and valve l36 aerations, close during standing, the mixing ratio of landfill gas and air Between 2: 1~4: 1;2. flow back gas cyclic aeration, air aeration 50min simultaneously, stands 10min, and aeration and standing are exchanged Carry out, the process duration is 11h, and valve l36 closings, unlatching when valve k35, valve a25 and valve b26 aerations stand When close, in IN ponds gas inner circulating tube 6, the gas ratio of interior circulation is 50%~80%;
3rd, the aeration flow process in 4 a cycle of ID ponds is:Landfill gas deoxidation aeration 50min, stands 10min, aeration and quiet Putting exchange is carried out, and the process duration is 12h, is opened when valve g31, valve h32, valve i33 and valve j34 aerations, quiet Close when putting, in ID ponds inner-outer circulations pipe 11, the gas ratio of gas interior circulation is 70%-90%.
4th, in IN ponds gas inner circulating tube 6 the gas interior circulation in interior circulation and ID ponds inner-outer circulations pipe 11 is relied on respectively IN ponds internal circulation pump 19 and ID ponds internal circulation pump 20;When in landfill gas, methane concentration is low, by Open valve f30, valve G31 and valve j34, by ID ponds gas inner circulating tube 11, carries out outer circulation by ID ponds outer circulation pump 13, to improve landfill gas Air inlet methane concentration.
5th, after IN ponds 2 complete the gas explosion effect of a cycle, while opening valve a25 and valve b26, discharge in IN ponds 2 Gas;After ID ponds 4 complete the gas explosion effect of a cycle, while opening valve c27 and valve d28, and valve e29 discharges are closed Gas in ID ponds 4.Aerofluxuss accelerate aerofluxuss by landfill gas aeration simultaneously, and evacuation time is 2min.
6th, the water Jing after ID ponds 4 enters sedimentation tank 5 by connecting tube 17, and clarifier sludge part passes through mud return line 8 IN ponds 2 are back to, water after precipitation is denitrogenation water outlet.
It is described with reference to specific embodiment.
Embodiment 1
The present embodiment is based on above-mentioned technical proposal, and waste water is processed, and certain municipal sewage, influent quality are BOD5: 240-330mg/L, NH3-N:34-43mg/L, TN:42-55mg/L, day output 3000m3/d。
2 length × width × height of IN ponds:30m × 10m × 3.5m effectively high 3m, 4 length × width × height of ID ponds:10m×10m×3.5m Effectively high 3m, dividing wall 38 are the high 0.6m in pond away from bottom of pond distance;IN ponds aeration tube 37 in reinforcing nitrification tank IN ponds 2 stretches into pond Interior 20m;The pre- domestication in IN ponds 2 and processing stage landfill gas air inlet pipe 1 average air demand be 680m3/ h, wherein landfill gas and It is 50% that the mixing ratio of air is the gas ratio of interior circulation in 2: 1, IN ponds gas inner circulating tube 6, and hydraulic detention time is 9.6h;The pre- domestication in ID ponds 4 and processing stage landfill gas air inlet pipe 1 average air demand be 220m3/ h, ID pond inner-outer circulation pipe In 11, the gas ratio of gas interior circulation is 70%, and the temperature of degasifier 3 is 400 DEG C;Under this operating condition, sedimentation tank water outlet Water quality is:BOD5:25-34mg/L, NH3-N:7-13mg/L, TN:11-18mg/L;BOD5、NH3The clearance of-N and TN respectively compared with Conventional rear-mounted denitrification denitrification process has been respectively increased 12%, 15% and 22%.During winter operation, IN ponds 2 and ID ponds 4 are pasted Thickness is incubated for the expansion polyphenyl plate 24 of 5mm, and for the waste water, the conventional rear-mounted denitrification denitrification process Jing systems are strong COD after changeCr、NH3The clearance of-N and TN has been respectively increased 16%, 19% and 29%.
Embodiment 2
The present embodiment is based on above-mentioned technical proposal, and certain waste water of livestock poultry is processed, and average water quality is CODCr2530mg/L, TN640mg/L, NH4+- N280mg/L, day output 5000m3/d。
2 length × width × height of IN ponds:30m × 10m × 3.5m effectively high 3m, 4 length × width × height of ID ponds:10m×10m×3.5m Effectively high 3m, dividing wall 38 are the high 0.6m in pond away from bottom of pond distance;IN ponds aeration tube 37 in reinforcing nitrification tank IN ponds 2 stretches into pond Interior 20m;The pre- domestication in IN ponds 2 and processing stage landfill gas air inlet pipe 1 average air demand be 900m3/ h, wherein landfill gas and It is 80% that the mixing ratio of air is the gas ratio of interior circulation in 2: 1, IN ponds gas inner circulating tube 6, and hydraulic detention time is 5.76h;The pre- domestication in ID ponds 4 and processing stage landfill gas air inlet pipe 1 average air demand be 300m3/ h, ID pond inner-outer circulation In pipe 11, the gas ratio of gas interior circulation is 90%, and the temperature of degasifier 3 is 500 DEG C;Under this operating condition, sedimentation tank goes out Water water quality is:CODCr:350mg/L, NH3-N:62mg/L, TN:96mg/L;CODCr、NH3The clearance difference of-N and TN is more conventional Rear-mounted denitrification denitrification process has been respectively increased 16%, 18% and 27%.During winter operation, thickness is pasted in IN ponds 2 and ID ponds 4 Expansion polyphenyl plate 24 for 5mm is incubated, and for the waste water, conventional rear-mounted denitrification denitrification process is Jing after the system hardening CODCr、NH3The clearance of-N and TN has been respectively increased 16%, 26% and 37%.
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned Particular implementation, those skilled in the art can make various modifications or modification within the scope of the claims, this not shadow Ring the flesh and blood of the present invention.

Claims (9)

1. a kind of system for strengthening rear-mounted denitrification denitrification process, including:Landfill gas air inlet pipe (1), reinforcing nitrification tank (2), degasifier (3), intensified anti-nitrated pond (4) and sedimentation tank (5);It is characterized in that:Reinforcing nitrification tank (2) and the anti-nitre of reinforcing Change pond (4) and form reaction zone, and strengthen nitrification tank (2) and connect with intensified anti-nitrated pond (4) bottom, and lay aeration tube respectively (18), aeration head (9) is evenly equipped with the pipeline of aeration tube (18);The top of reinforcing nitrification tank (2) arranges IN ponds gas interior circulation Pipe (6) and IN ponds exhaustor (14), the top of intensified anti-nitrated pond (4) arrange ID ponds gas inner-outer circulation pipe (11), wherein IN IN ponds gas internal circulation pump (19) are configured with pond gas inner circulating tube (6), are configured with ID ponds gas inner-outer circulation pipe (11) ID ponds gas internal circulation pump (20) and ID ponds gas cardiopulmonary bypass pump (13);Degasifier (3) by deoxidation air inlet pipe (12) respectively with Landfill gas air inlet pipe (1) and ID ponds gas inner-outer circulation pipe (11) connection;It is connected with landfill gas air inlet pipe in the gas of IN ponds and follows Endless tube (6), air intake duct (10) and deoxidation air inlet pipe (12);Sedimentation tank (5) is by connecting tube (17) and intensified anti-nitrated pond (4) connect, the sludge of sedimentation tank (5) is back to reinforcing nitrification tank (2) by mud return line (8);
In reinforcing nitrification tank (2) and intensified anti-nitrated pond (4) gas adopted by aeration is landfill gas, wherein, enter The landfill gas of intensified anti-nitrated pond (4) carry out deoxidation treatment through degasifier (3).
2. the system for strengthening rear-mounted denitrification denitrification process according to claim 1, it is characterised in that:Degasifier (3) including electric furnace heating wire (21) and copper mesh (22), high temperature is formed by electric furnace heating wire (21) heat production and copper mesh (22) is heated, is filled Gas deoxidation after scorching hot copper mesh (22).
3. the system for strengthening rear-mounted denitrification denitrification process according to claim 1, it is characterised in that:The reinforcing Separated by dividing wall (38) between nitrification tank (2) and intensified anti-nitrated pond (4).
4. the system for strengthening rear-mounted denitrification denitrification process according to claim 3, it is characterised in that reinforcing nitrification It is the 2/3 of reinforcing nitrification tank (2) pond length that the length in pond is stretched in IN ponds aeration tube (37) in pond (2);Dividing wall (38) is away from bottom of pond Distance is high 1/5 in pond.
5. the system for strengthening rear-mounted denitrification denitrification process according to claim 1, it is characterised in that:Reinforcing nitrification In pond (2), the mixing ratio of landfill gas and air is between 2:1~4:Between 1;The gas of interior circulation in IN ponds gas inner circulating tube (6) Ratio is 50%~80%;In ID ponds inner-outer circulation pipe (11), the gas ratio of gas interior circulation is 70%-90%.
6. the system for strengthening rear-mounted denitrification denitrification process according to claim 1, it is characterised in that:The reinforcing Nitrification tank (2) and intensified anti-nitrated pond (4) adopt intermittent aeration mode, and aeration period is 12h.
7. the system for strengthening rear-mounted denitrification denitrification process according to claim 6, it is characterised in that:The reinforcing Aeration process in nitrification tank (2) a cycle is:
(1) the gaseous mixture aeration 50min of landfill gas and air, stands 10min, and the process duration is 1h;
(2) flow back gas cyclic aeration and air aeration carries out 50min altogether, stands 10min, aeration and stands alternately, the mistake The journey persistent period is 11h.
8. the system for strengthening rear-mounted denitrification denitrification process according to claim 6, it is characterised in that:The reinforcing Aeration process in denitrification pond (4) a cycle is:
Landfill gas aeration 50min after deoxidation, stands 10min, and alternately, the process duration is 12h for aeration and standing.
9. the system for strengthening rear-mounted denitrification denitrification process according to claim 1, it is characterised in that:Reinforcing nitrification In pond (2) and intensified anti-nitrated pond (4), the pre- domestication time of sludge is between 3-5d.
CN201410525548.8A 2014-10-08 2014-10-08 System for strengthening post-denitrification denitrogenation process Expired - Fee Related CN104326559B (en)

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