CN204400766U - A kind of strengthening rear-mounted denitrification denitrification system - Google Patents
A kind of strengthening rear-mounted denitrification denitrification system Download PDFInfo
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- CN204400766U CN204400766U CN201420579078.9U CN201420579078U CN204400766U CN 204400766 U CN204400766 U CN 204400766U CN 201420579078 U CN201420579078 U CN 201420579078U CN 204400766 U CN204400766 U CN 204400766U
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Abstract
The utility model discloses a kind of strengthening rear-mounted denitrification denitrification system, comprise landfill gas inlet pipe, strengthening nitrification tank (IN pond), deoxygenator, intensified anti-nitrated pond (ID pond) and settling tank; IN pond adopts landfill gas aeration, and the landfill gas that the employing of ID pond removes oxygen through deoxygenator carries out aeration; IN pond aeration tube in IN pond stretch into length in pond be pond long 2/3; IN pond and ID pond are separated by dividing wall, dividing wall apart from distance at the bottom of pond be pond high 1/5.It is high that the utility model has nitric efficiency, and treatment effect is stablized, and technical process is simple, process structures and equipment less, capital construction and the feature such as running cost is low.
Description
Technical field
The utility model relates to the system of a kind of enhanced biological stress efficacy of water-treatment technology field, in particular, is a kind of strengthening rear-mounted denitrification denitrification system (IN-ID system).
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 pollutant and ammonifying process, nitration reaction are carried out in same reactor (aeration tank), and the mixed solution flowed out from this reactor, without precipitation, directly enters anoxic pond, carries out denitrification.This technical process is simple, process structures and equipment less, overcome the drawbacks common of multi-stage biological denitrification system.But still there is the intrinsic shortcoming of rear-mounted denitrification, namely nitrifying process possibility basicity is not enough, denitrification process carbon source is not enough, and integrated artistic nitric efficiency is not as good as preposition anaerobic-aerobic (A/O) denitrification process and anaerobic-aerobic segmental influent denitrification process, in addition, also there is the common drawback of biological treatment in it, namely temperature influence is comparatively large, as processing efficiency during winter operation reduces greatly.
Landfill gas (LFG) is the product of biodegradable organic under microbial process in landfill waste mainly.Main component is methane (CH
4), carbonic acid gas (CO
2), nitrogen (N
2), oxygen (O
2) etc., proportion is respectively 45% ~ 60%, 40% ~ 60%, 2% ~ 5%, 0.1% ~ 1.0%.Methane (CH
4) and carbonic acid gas (CO
2) as two kinds of most important greenhouse gases, be the main study subject of landfill yard reduction of greenhouse gas discharge.At present, landfill gas (LFG) gathering system and overburden soil bio-oxidation are the Main Means of landfill boat reduction of greenhouse gas discharge, overburden soil bio-oxidation is passed through at rubbish surface mulching soil layer, greenhouse gases release is reduced by soil microorganisms oxidation, but its reduction of discharging is limited in one's ability, and affects very large by meteorological conditions; Landfill gas collecting system to be collected gas by laying pipeline inside and to collect, and affect less, but landfill gas component is more by meteorological conditions, 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 oxidized to the process of nitric acid under microbial process.Denitrification also claims denitrogenation, refers to that denitrifying bacterium under anoxic conditions, and reduction nitrate, discharges molecular nitrogen (N
2) or nitrous oxide (N
2o) process study shows: 1) NH
4 +and CH
4tetrahedral molecule similar, molecular weight is close, and methane mono-oxygenase is structurally also very similar with ammonia mono-oxygenase, therefore ammonia oxidation bacteria and methane-oxidizing bacteria can be oxidized NH
4 +, and methane-oxidizing bacteria is with CH
4as the energy and carbon source; 2) CH
4anaerobic oxidation is biochemical reaction important in anaerobic environment, NO
2 -or NO
3 -can be used as CH equally
4the electron acceptor(EA) of anaerobic oxidation, can be expressed as with chemical equation:
5CH
4+8NO
3 -+8H
+→5CO
2+4N
2+14H
2O (1)
(G°，＝-765kJ mol
-1CH
4)
3CH
4+8NO
2 -+8H
+→3CO
2+4N
2+10H
2O (2)
(G°’＝-928kJ mol
-1CH
4)
But existing have rear-mounted denitrification denitrification process to there is denitrification process carbon source deficiency, and integrated artistic nitric efficiency is relatively low, and is difficult to further raising, runs the problems such as processing efficiency is low under winter low temperature condition.
Utility model content
The utility model is for above shortcomings in prior art, provide a kind of strengthening rear-mounted denitrification denitrification system (IN-ID system), 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%; Denitrification effect is close to anaerobic-aerobic (A/O) denitrification process and anaerobic-aerobic segmental influent denitrification process.Adopting the rear-mounted denitrification denitrification process after native system strengthening, to have nitric efficiency high, and treatment effect is stablized, and technical process is simple, process structures and equipment less, capital construction and the feature such as running cost is low.
In order to realize above-mentioned technical purpose, the utility model is achieved through the following technical solutions.
A kind of strengthening rear-mounted denitrification denitrification system, comprising: landfill gas inlet pipe 1, strengthening nitrification tank (IN pond) 2, deoxygenator 3, intensified anti-nitrated pond (ID pond) 4 and settling tank 5; Strengthening nitrification tank 2 and forming reactions district, intensified anti-nitrated pond 4, and strengthening nitrification tank 2 is communicated with bottom intensified anti-nitrated pond 4, and lay aeration tube 18 respectively, the pipeline of aeration tube 18 is evenly equipped with aeration head 9; The top of strengthening nitrification tank 2 arranges IN pond gas inner circulating tube 6 and IN pond vapor pipe 14, the top in intensified anti-nitrated pond 4 arranges ID pond gas inner-outer circulation pipe 11, wherein IN pond gas inner circulating tube 6 is configured with on gas internal circulation pump 19, ID pond, IN pond gas inner-outer circulation pipe 11 and is configured with ID pond gas internal circulation pump 20 and ID pond gas cardiopulmonary bypass pump 13; Deoxygenator 3 is connected with landfill gas inlet pipe 1 and ID pond gas inner-outer circulation pipe 11 respectively by deoxidation inlet pipe 12; Landfill gas inlet pipe is connected with IN pond gas inner circulating tube 6, air intake duct 10 and deoxidation inlet pipe 12; Settling tank 6 is connected with intensified anti-nitrated pond 4 by pipe connecting 17, and the mud of settling tank 6 is back to strengthening nitrification tank 2 by mud return line 8.
Preferably, the gas that in described strengthening nitrification tank 2 and intensified anti-nitrated pond 4, aeration adopts is landfill gas, and wherein, the landfill gas entering intensified anti-nitrated pond 4 carries out deoxidation treatment through deoxygenator 3.
Preferably, described deoxygenator 3 comprises electric stove wire 21 and copper wire gauze 22, forms high temperature and Heated Copper silk screen 22, landfill gas deoxidation after scorching hot copper wire gauze 22 by electric stove wire 21 heat production.
Preferably, separated by dividing wall 38 between described strengthening nitrification tank 2 and intensified anti-nitrated pond 4
Preferably, the IN pond aeration tube 37 of strengthening nitrification tank 2 stretches into length in pond is strengthen nitrification tank 2 pond length 2/3; Dividing wall 38 at the bottom of pond distance be pond high 1/5.
Preferably, in described strengthening nitrification tank 2 ratio of mixture of landfill gas and air between 2: 1 ~ 4: 1; In IN pond gas inner circulating tube 6, the gas ratio of internal recycle is 50% ~ 80%; In ID pond inner-outer circulation pipe 11, the gas ratio of gas internal recycle is 70%-90%.
Preferably, described strengthening nitrification tank 2 and intensified anti-nitrated pond 4 all adopt intermittent aeration mode, and aeration period is 12h.
Preferably, the aeration process in described strengthening nitrification tank 2 one-period is:
(1) the gas mixture aeration 50min of landfill gas and air, leave standstill 10min, this process duration is 1h;
(2) backflow gas cyclic aeration and air aeration carry out 50min altogether, leave standstill 10min, and aeration hockets with leaving standstill, and this process duration is 11h.
Preferably, the aeration process in the one-period of described intensified anti-nitrated pond 4 is:
Landfill gas aeration 50min after deoxidation, leaves standstill 10min, and aeration hockets with leaving standstill, and this process duration is 12h.
Preferably, the pre-domestication time of mud in nitrification tank 2 and intensified anti-nitrated pond 4 is strengthened between 3-5d.
The strengthening rear-mounted denitrification denitrification system that the utility model provides, its working process comprises the steps:
(1) stage is tamed in advance:
On the basis of original mud, former water enters strengthening nitrification tank IN pond through water inlet pipe 7, reaches certain volume V
1after, stop water inlet, the treatment stage that Open valve 136, valve g31, valve h32 and valve i33, IN pond 2 and ID pond 4 can entering after 3-5d domestication simultaneously, domestication stage aeration adopts intermittent type.Aeration flow process in the one-period of IN pond 2 is: 1. landfill gas, air Mixture aeration 50min, and leave standstill 10min, this process duration is 1h; 2. reflux gas cyclic aeration, air aeration 50min simultaneously, and leave standstill 10min, aeration and standing exchange are carried out, and this process duration is 11h; Aeration flow process in the one-period of ID pond 4 is: landfill gas deoxidation aeration 50min, and leave standstill 10min, aeration and standing exchange are carried out, and this process duration is 12h.After domestication terminates,
(2) treatment stage:
1., after domestication stage in advance, former water is with certain flow q
1enter strengthening nitrification tank IN pond through water inlet pipe 7, Open valve 136, valve g31, valve h32, valve i33 and valve j34 carry out aeration simultaneously, and a part of landfill gas presses certain flow Q through landfill gas inlet pipe 1
1enter IN pond 2, and by the uniform air inlet of aeration head 9; Another part landfill gas enters deoxygenator 3 through deoxidation inlet pipe 12, oxygen in landfill gas and scorching hot copper mesh 22 react thus take off oxygen wherein, this process relies on electric stove wire 21 to heat, temperature after heating remains on 400 ~ 500 DEG C, landfill gas through deoxidation enters ID pond 4 by ID pond aeration tube 18, the uniform air inlet of same dependence aeration head 9;
Aeration flow process in the one-period of 2.IN pond 2 is: 1. landfill gas, air Mixture aeration 50min, leave standstill 10min, this process duration is 1h, opens when valve j34 and valve 136 aeration, close when leaving standstill, the ratio of mixture of landfill gas and air is between 2: 1 ~ 4: 1; 2. reflux gas cyclic aeration, air aeration 50min simultaneously, leave standstill 10min, aeration and standing exchange are carried out, this process duration is 11h, valve 136 is closed, open when valve k35, valve 15 and valve b26 aeration, close when leaving standstill, in IN pond gas inner circulating tube 6, the gas ratio of internal recycle is 50% ~ 80%;
Aeration flow process in the one-period of 3.ID pond 4 is: landfill gas deoxidation aeration 50min, leave standstill 10min, aeration and standing exchange are carried out, this process duration is 12h, valve g31, valve h32, valve i33 and valve j34 aeration time open, close when leaving standstill, in ID pond inner-outer circulation pipe 11, the gas ratio of gas internal recycle is 70%-90%.
Gas internal recycle in internal recycle in 4.IN pond gas inner circulating tube 6 and ID pond inner-outer circulation pipe 11 relies on IN pond internal circulation pump 19 and ID pond internal circulation pump 20 respectively; When methane concentration is on the low side in landfill gas, by Open valve f30, valve g31 and valve j34, by ID pond gas inner circulating tube 11, ID pond outer circulation pump 13 is relied on to carry out outer circulation, to improve landfill gas air inlet methane concentration.
After 5.IN pond 2 completes the gas explosion effect of one-period, open valve 15 and valve b26 simultaneously, discharge gas in IN pond 2; After ID pond 4 completes the gas explosion effect of one-period, open valve c27 and valve d28, and valve-off e29 discharges gas in ID pond 4 simultaneously.Exhaust accelerates exhaust by landfill gas aeration simultaneously, and evacuation time is 2min.
6. the water behind ID pond 4 enters settling tank 5 by pipe connecting 17, and clarifier sludge part is back to IN pond 2 by mud return line 8, and water is after precipitation denitrogenation water outlet.
Compared with prior art, the utility model has following beneficial aspects:
1) gas mixture by passing into landfill gas and air in IN pond 2 is tamed in advance and runs, in the ratio of mixture of landfill gas and air between 2: 1 ~ 4: 1, ensure that the aerobic environment in pond, methane simultaneously in landfill gas is that methane-oxidizing bacteria provides the energy and carbon source, enhance the nitrification activity of aerobic methane-oxidizing bacteria and aerobic ammonia-oxidizing bacteria in pond, enrich population quantity, thus enhance nitrification.
2) tame in advance by passing into the landfill gas after deoxidation in ID pond 4 and run, under the condition of anaerobism, enhance the nitrification activity of anaerobic methane oxidation bacterium and anaerobic ammonia oxidizing bacteria in pond, enrich the population quantity of two quasi-microorganisms, by the effect of anaerobic methane oxidation coupling denitrification, enhance denitrification denitrogenation efficiency.
3) the effective utilization to landfill gas is enhanced by the gas internal recycle in the internal recycle in IN pond gas inner circulating tube 6 and ID pond inner-outer circulation pipe 11; The air inlet methane concentration of landfill gas inlet pipe 1 is ensure that by the outer circulation of ID pond gas inner circulating tube 11.
4) because being filled with a large amount of methane and carbon dioxide greenhouse gases in IN pond 2 and ID pond 4, and to be bondd external insulation material expansion styrofoam 24 by tack coat 23, the operation processing efficiency under relying on the Greenhouse effect of greenhouse gases and lagging material insulation effect to ensure that winter low temperature condition.
5) ID pond 4 relies on anaerobic methane oxidation bacterium and anaerobic ammonia oxidizing bacteria to carry out denitrification simultaneously, active is excellent anaerobic methane oxidation bacterium, and anaerobic methane oxidation bacterium relies on methane to provide carbon source and the energy, therefore do not need additional carbon, solve the problem of the denitrification process carbon source deficiency that rear-mounted denitrification denitrification process exists.
6) because of the increase of microbial population, the BOD clearance in IN pond 2 and ID pond 4 have also been obtained certain raising.
The strengthening rear-mounted denitrification denitrification system that the utility model provides, has that nitric efficiency is high, treatment effect is stable, technical process is simple, process structures and equipment is less, capital construction and the feature such as running cost is low.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present utility model will become more obvious:
Fig. 1 is existing rear-mounted denitrification denitrification process.
Fig. 2 is the utility model process flow diagram.
Fig. 3 is the structural representation that the utility model B-B analyses and observe.
Fig. 4 is the utility model IN pond and ID pond insulation construction schematic diagram.
Fig. 5 is the utility model one-piece construction effect schematic diagram.
In figure: 1 is landfill gas inlet pipe; 2 is strengthening nitrification tank (IN pond); 3 is deoxygenator; 4 is intensified anti-nitrated pond (ID pond); 5 is settling tank; 6 is IN pond gas inner circulating tube; 7 is water inlet pipe; 8 is mud return line; 9 is aeration head; 10 is air intake duct; 11 is ID pond gas inner circulating tube; 12 is deoxidation inlet pipe; 13 is ID pond outer circulation pump; 14 is IN pond vapor pipe; 15 is ID pond vapor pipe; 16 is ID pond gaseous combustion pipe; 17 is pipe connecting; 18 is ID pond aeration tube; 19 is IN pond internal circulation pump; 20 is ID pond internal circulation pump; 21 is electric stove wire; 22 is copper mesh; 23 is tack coat; 24 is expansion polyphenyl plate; 25 is valve a; 26 is valve 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 is valve j; 35 is valve k; 36 is valve 1; 37 is IN pond aeration tube; 38 is dividing wall; 39 is control line; 40 is Valve controlling center;
In Fig. 3:
Embodiment
Below embodiment of the present utility model is elaborated: the present embodiment is implemented under premised on technical solutions of the utility model, give detailed embodiment and concrete operating process.It should be pointed out that to those skilled in the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.
This embodiment provides a kind of strengthening rear-mounted denitrification denitrification system, comprising: landfill gas inlet pipe 1, strengthening nitrification tank (IN pond) 2, deoxygenator 3, intensified anti-nitrated pond (ID pond) 4 and settling tank 5; Strengthening nitrification tank 2 and forming reactions district, intensified anti-nitrated pond 4, and strengthening nitrification tank 2 is communicated with bottom intensified anti-nitrated pond 4, and lay aeration tube 18 respectively, the pipeline of aeration tube 18 is evenly equipped with aeration head 9; The top of strengthening nitrification tank 2 arranges IN pond gas inner circulating tube 6 and IN pond vapor pipe 14, the top in intensified anti-nitrated pond 4 arranges ID pond gas inner-outer circulation pipe 11, wherein IN pond gas inner circulating tube 6 is configured with on gas internal circulation pump 19, ID pond, IN pond gas inner-outer circulation pipe 11 and is configured with ID pond gas internal circulation pump 20 and ID pond gas cardiopulmonary bypass pump 13; Deoxygenator 3 is connected with landfill gas inlet pipe 1 and ID pond gas inner-outer circulation pipe 11 respectively by deoxidation inlet pipe 12; Landfill gas inlet pipe is connected with IN pond gas inner circulating tube 6, air intake duct 10 and deoxidation inlet pipe 12; Settling tank 6 is connected with intensified anti-nitrated pond 4 by pipe connecting 17, and the mud of settling tank 6 is back to strengthening nitrification tank 2 by mud return line 8.
Further, the gas that in described strengthening nitrification tank 2 and intensified anti-nitrated pond 4, aeration adopts is landfill gas, and wherein, the landfill gas entering intensified anti-nitrated pond 4 carries out deoxidation treatment through deoxygenator 3.
Further, described deoxygenator 3 comprises electric stove wire 21 and copper wire gauze 22, forms high temperature and Heated Copper silk screen 22, landfill gas deoxidation after scorching hot copper wire gauze 22 by electric stove wire 21 heat production.
Further, strengthening nitrification tank (IN pond) 2 and intensified anti-nitrated pond (ID pond) 4 all arrange gas internal reflux pipeline, are respectively IN pond gas inner circulating tube 6 and ID pond gas inner-outer circulation pipe 11, improve the utilising efficiency of landfill gas with this.
Further, system carries out outer circulation, with the air inlet CH4 concentration of this stable landfill gas inlet pipe 1 by arranging ID pond gas inner-outer circulation pipe 11.
Further, separated by dividing wall 38 between described strengthening nitrification tank 2 and intensified anti-nitrated pond 4
Preferably, the IN pond aeration tube 37 of strengthening nitrification tank 2 stretches into length in pond is strengthen nitrification tank 2 pond length 2/3; Dividing wall 38 at the bottom of pond distance be pond high 1/5.
Further, in described strengthening nitrification tank 2 ratio of mixture of landfill gas and air between 2: 1 ~ 4: 1; In IN pond gas inner circulating tube 6, the gas ratio of internal recycle is 50% ~ 80%; In ID pond inner-outer circulation pipe 11, the gas ratio of gas internal recycle is 70%-90%.
Further, described strengthening nitrification tank 2 and intensified anti-nitrated pond 4 all adopt intermittent aeration mode, and aeration period is 12h.
Further, the aeration process in described strengthening nitrification tank 2 one-period is:
(1) the gas mixture aeration 50min of landfill gas and air, leave standstill 10min, this process duration is 1h;
(2) backflow gas cyclic aeration and air aeration carry out 50min altogether, leave standstill 10min, and aeration hockets with leaving standstill, and this process duration is 11h.
Further, the aeration process in the one-period of described intensified anti-nitrated pond 4 is:
Landfill gas aeration 50min after deoxidation, leaves standstill 10min, and aeration hockets with leaving standstill, and this process duration is 12h.
Further, the pre-domestication time of mud in nitrification tank 2 and intensified anti-nitrated pond 4 is strengthened between 3-5d.
For understanding the content of this embodiment further, be described in detail below in conjunction with accompanying drawing.
As shown in Figure 2, one strengthening rear-mounted denitrification denitrification system (IN-ID system) that this embodiment provides, comprises landfill gas inlet pipe 1, strengthening nitrification tank (IN pond) 2, deoxygenator 3, intensified anti-nitrated pond (ID pond) 4, settling tank 5; Reaction zone is formed primarily of strengthening nitrification tank IN pond 2 and ID pond, intensified anti-nitrated pond 4, and 2 are communicated with bottom 4, all lay aeration tube 18, pipeline are evenly equipped with aeration head 9; The top in IN pond 2 arranges IN pond gas inner circulating tube 6 and IN pond vapor pipe 14, the top in ID pond 4 arranges ID pond gas inner-outer circulation pipe 11, wherein configures IN pond gas internal circulation pump 19, ID pond gas internal circulation pump 20 and ID pond gas cardiopulmonary bypass pump 13 respectively on 6 and 11; Deoxygenator 3 is formed primarily of electric stove wire 21 and copper wire gauze 22, is connected with landfill gas inlet pipe 1 and ID pond gas inner-outer circulation pipe 11 by deoxidation inlet pipe 12; Landfill gas inlet pipe is connected with IN pond gas inner circulating tube 6, air intake duct 10 and deoxidation inlet pipe 12; Settling tank 6 is connected with ID pond, intensified anti-nitrated pond 4 by pipe connecting 17, and the mud of settling tank 6 is back to strengthening nitrification tank IN pond 2 by mud return line 8.
Strengthen the gas that in nitrification tank IN pond 2 and ID pond, intensified anti-nitrated pond 4, aeration adopts and be landfill gas, difference be enter ID pond, intensified anti-nitrated pond 4 landfill gas deoxygenator 3 be stripped of oxygen, removing oxygen is to get rid of in landfill gas oxygen to the impact of anaerobic environment in ID pond 4.
Deoxygenator 3 adopts electric stove wire 21 heat production to form high temperature Heated Copper silk screen 22, landfill gas deoxidation after scorching hot copper wire gauze 22, and copper at high temperature can deviate from oxygen with oxygen reaction.
Strengthening nitrification tank IN pond 2 and ID pond, intensified anti-nitrated pond 4 all arrange gas internal reflux pipeline, are respectively IN pond gas inner circulating tube 6 and ID pond gas inner-outer circulation pipe 11, improve the utilising efficiency of landfill gas with this.
System carries out outer circulation, with the air inlet CH of this stable landfill gas inlet pipe 1 by arranging ID pond gas inner-outer circulation pipe 11
4concentration.
IN pond aeration tube 37 in strengthening nitrification tank IN pond 2 stretch into length in pond be IN Chi2Chi long 2/3; IN pond 2 and ID pond 4 are separated by dividing wall 38, dividing wall 38 at the bottom of pond distance be pond high 1/5, the anaerobic environment under this height in guarantee ID pond 4 and denitrification denitrogenation effect;
In IN pond 2, the ratio of mixture of landfill gas and air is between 2: 1 ~ 4: 1; In IN pond gas inner circulating tube 6, the gas ratio of internal recycle is 50% ~ 80%, under this ratio in guarantee IN pond 2 greenhouse gases heat effect; In ID pond inner-outer circulation pipe 11, the gas ratio of gas internal recycle is 70%-90%, under this ratio in guarantee ID pond 4 greenhouse gases heat effect;
IN pond 2 and ID pond 4 all adopt intermittent aeration, and the cycle, to be the aeration flow process in the one-period of 12h, IN pond 2 be: 1. landfill gas, air Mixture aeration 50min, and leave standstill 10min, this process duration is 1h; 2. reflux gas cyclic aeration, air aeration 50min, and leave standstill 10min, aeration and standing exchange are carried out, and this process duration is 11h; Aeration flow process in the one-period of ID pond 4 is: landfill gas deoxidation aeration 50min, leave standstill 10min, aeration and standing exchange are carried out, and this process duration is 12h, and aeration time and time of repose ratio are can ensure delivery turbidity under the condition ensureing treatment effect under the condition of 5: 1;
In IN pond 2 and ID pond 4, the pre-domestication time of microorganism is between 3-5d, can meet domestication effect under this domestication time.
Above-mentioned strengthening rear-mounted denitrification denitrification system, the steps include:
A) tame the stage in advance: on the basis of original mud, former water enters strengthening nitrification tank IN pond through water inlet pipe 7, reaches certain volume V
1after, stop water inlet, the treatment stage that Open valve 136, valve g31, valve h32 and valve i33, IN pond 2 and ID pond 4 can entering after 3-5d domestication simultaneously, domestication stage aeration adopts intermittent type.Aeration flow process in the one-period of IN pond 2 is: 1. landfill gas, air Mixture aeration 50min, and leave standstill 10min, this process duration is 1h; 2. reflux gas cyclic aeration, air aeration 50min simultaneously, and leave standstill 10min, aeration and standing exchange are carried out, and this process duration is 11h; Aeration flow process in the one-period of ID pond 4 is: landfill gas deoxidation aeration 50min, and leave standstill 10min, aeration and standing exchange are carried out, and this process duration is 12h.After domestication terminates,
B) treatment stage:
1, after domestication stage in advance, former water is with certain flow q
1enter strengthening nitrification tank IN pond through water inlet pipe 7, Open valve 136, valve g31, valve h32, valve i33 and valve j34 carry out aeration simultaneously, and a part of landfill gas presses certain flow Q through landfill gas inlet pipe 1
1enter IN pond 2, and by the uniform air inlet of aeration head 9; Another part landfill gas enters deoxygenator 3 through deoxidation inlet pipe 12, oxygen in landfill gas and scorching hot copper mesh 22 react thus take off oxygen wherein, this process relies on electric stove wire 21 to heat, temperature after heating remains on 400 ~ 500 DEG C, landfill gas through deoxidation enters ID pond 4 by ID pond aeration tube 18, the uniform air inlet of same dependence aeration head 9;
2, the aeration flow process in the one-period of IN pond 2 is: 1. landfill gas, air Mixture aeration 50min, leave standstill 10min, this process duration is 1h, opens when valve j34 and valve 136 aeration, close when leaving standstill, the ratio of mixture of landfill gas and air is between 2: 1 ~ 4: 1; 2. reflux gas cyclic aeration, air aeration 50min simultaneously, leave standstill 10min, aeration and standing exchange are carried out, this process duration is 11h, valve 136 is closed, open when valve k35, valve a25 and valve b26 aeration, close when leaving standstill, in IN pond gas inner circulating tube 6, the gas ratio of internal recycle is 50% ~ 80%;
3, the aeration flow process in the one-period of ID pond 4 is: landfill gas deoxidation aeration 50min, leave standstill 10min, aeration and standing exchange are carried out, this process duration is 12h, valve g31, valve h32, valve i33 and valve j34 aeration time open, close when leaving standstill, in ID pond inner-outer circulation pipe 11, the gas ratio of gas internal recycle is 70%-90%.
4, the internal recycle in IN pond gas inner circulating tube 6 and the gas internal recycle in ID pond inner-outer circulation pipe 11 rely on IN pond internal circulation pump 19 and ID pond internal circulation pump 20 respectively; When methane concentration is on the low side in landfill gas, by Open valve f30, valve g31 and valve j34, by ID pond gas inner circulating tube 11, ID pond outer circulation pump 13 is relied on to carry out outer circulation, to improve landfill gas air inlet methane concentration.
5, after IN pond 2 completes the gas explosion effect of one-period, open valve a25 and valve b26 simultaneously, discharge gas in IN pond 2; After ID pond 4 completes the gas explosion effect of one-period, open valve c27 and valve d28, and valve-off e29 discharges gas in ID pond 4 simultaneously.Exhaust accelerates exhaust by landfill gas aeration simultaneously, and evacuation time is 2min.
6, the water behind ID pond 4 enters settling tank 5 by pipe connecting 17, and clarifier sludge part is back to IN pond 2 by mud return line 8, and water is after precipitation denitrogenation water outlet.
Be described below in conjunction with specific embodiment.
Embodiment 1
The present embodiment, based on technique scheme, processes waste water, certain municipal effluent, and influent quality is BOD
5: 240-330mg/L, NH
3-N:34-43mg/L, TN:42-55mg/L, day output 3000m
3/ d.
IN pond 2 is long × wide × high: effective high 3m, the ID pond 4 of 30m × 10m × 3.5m is long × wide × high: the effective high 3m of 10m × 10m × 3.5m, and dividing wall 38 distance at the bottom of pond is the high 0.6m in pond; IN pond aeration tube 37 in strengthening nitrification tank IN pond 2 stretches into 20m in pond; IN pond 2 in advance domestication and treatment stage landfill gas inlet pipe 1 average air demand be 680m
3/ h, wherein the ratio of mixture of landfill gas and air is the gas ratio of internal recycle in 2: 1, IN pond gas inner circulating tube 6 is 50%, and hydraulic detention time is 9.6h; ID pond 4 in advance domestication and treatment stage landfill gas inlet pipe 1 average air demand be 220m
3in/h, ID pond inner-outer circulation pipe 11, the gas ratio of gas internal recycle is 70%, and the temperature of deoxygenator 3 is 400 DEG C; Under this operation condition, effluent quality of sedimentation tank is: BOD
5: 25-34mg/L, NH
3-N:7-13mg/L, TN:11-18mg/L; BOD
5, NH
3the clearance of-N and TN respectively more conventional rear-mounted denitrification denitrification process improves 12%, 15% and 22% respectively.During winter operation, it is that the expansion polyphenyl plate 24 of 5mm is incubated that thickness is all pasted in IN pond 2 and ID pond 4, for this routine waste water, and conventional rear-mounted denitrification denitrification process COD after this system hardening
cr, NH
3the clearance of-N and TN improves 16%, 19% and 29% respectively.
Embodiment 2
The present embodiment, based on technique scheme, processes certain waste water of livestock poultry, and average water quality is COD
cr2530mg/L, TN640mg/L, NH4
+-N280mg/L, day output 5000m
3/ d.
IN pond 2 is long × wide × high: effective high 3m, the ID pond 4 of 30m × 10m × 3.5m is long × wide × high: the effective high 3m of 10m × 10m × 3.5m, and dividing wall 38 distance at the bottom of pond is the high 0.6m in pond; IN pond aeration tube 37 in strengthening nitrification tank IN pond 2 stretches into 20m in pond; IN pond 2 in advance domestication and treatment stage landfill gas inlet pipe 1 average air demand be 900m
3/ h, wherein the ratio of mixture of landfill gas and air is the gas ratio of internal recycle in 2: 1, IN pond gas inner circulating tube 6 is 80%, and hydraulic detention time is 5.76h; ID pond 4 in advance domestication and treatment stage landfill gas inlet pipe 1 average air demand be 300m
3in/h, ID pond inner-outer circulation pipe 11, the gas ratio of gas internal recycle is 90%, and the temperature of deoxygenator 3 is 500 DEG C; Under this operation condition, effluent quality of sedimentation tank is: COD
cr: 350mg/L, NH
3-N:62mg/L, TN:96mg/L; COD
cr, NH
3the clearance of-N and TN respectively more conventional rear-mounted denitrification denitrification process improves 16%, 18% and 27% respectively.During winter operation, it is that the expansion polyphenyl plate 24 of 5mm is incubated that thickness is all pasted in IN pond 2 and ID pond 4, for this routine waste water, and conventional rear-mounted denitrification denitrification process COD after this system hardening
cr, NH
3the clearance of-N and TN improves 16%, 26% and 37% respectively.
Above specific embodiment of the utility model is described.It is to be appreciated that the utility model is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present utility model.
Claims (4)
1. strengthen a rear-mounted denitrification denitrification system, comprising: landfill gas inlet pipe (1), strengthening nitrification tank (2), deoxygenator (3), intensified anti-nitrated pond (4) and settling tank (5); It is characterized in that: strengthening nitrification tank (2) and intensified anti-nitrated pond (4) forming reactions district, and strengthening nitrification tank (2) is communicated with intensified anti-nitrated pond (4) bottom, and lay aeration tube (18) respectively, the pipeline of aeration tube (18) is evenly equipped with aeration head (9); The top of strengthening nitrification tank (2) arranges IN pond gas inner circulating tube (6) and IN pond vapor pipe (14), the top in intensified anti-nitrated pond (4) arranges ID pond gas inner-outer circulation pipe (11), wherein IN pond gas inner circulating tube (6) is configured with IN pond gas internal circulation pump (19), ID pond gas inner-outer circulation pipe (11) is configured with ID pond gas internal circulation pump (20) and ID pond gas cardiopulmonary bypass pump (13); Deoxygenator (3) is connected with landfill gas inlet pipe (1) and ID pond gas inner-outer circulation pipe (11) respectively by deoxidation inlet pipe (12); Landfill gas inlet pipe is connected with IN pond gas inner circulating tube (6), air intake duct (10) and deoxidation inlet pipe (12); Settling tank (6) is connected with intensified anti-nitrated pond (4) by pipe connecting (17), and the mud of settling tank (6) is back to strengthening nitrification tank (2) by mud return line (8).
2. strengthening rear-mounted denitrification denitrification system according to claim 1, is characterized in that: deoxygenator (3) comprises electric stove wire (21) and copper wire gauze (22).
3. strengthening rear-mounted denitrification denitrification system according to claim 1, is characterized in that: separated by dividing wall (38) between described strengthening nitrification tank (2) and intensified anti-nitrated pond (4).
4. strengthening rear-mounted denitrification denitrification system according to claim 3, is characterized in that, IN pond aeration tube (37) length stretched in pond of strengthening nitrification tank (2) is 2/3 of strengthening nitrification tank (2) pond length; Dividing wall (38) apart from distance at the bottom of pond be pond high 1/5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104326559A (en) * | 2014-10-08 | 2015-02-04 | 环境保护部南京环境科学研究所 | System for strengthening post-denitrification denitrogenation process |
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| CN104326559A (en) * | 2014-10-08 | 2015-02-04 | 环境保护部南京环境科学研究所 | System for strengthening post-denitrification denitrogenation process |
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