CN103936161A - Method and system for denitrifying low-carbon high-nitrogen sewage by utilizing plant carbon source-enhanced artificial wetland - Google Patents
Method and system for denitrifying low-carbon high-nitrogen sewage by utilizing plant carbon source-enhanced artificial wetland Download PDFInfo
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Abstract
The invention discloses a method and a system for denitrifying low-carbon high-nitrogen sewage by utilizing a plant carbon source-enhanced artificial wetland. The method comprises the following steps: hydrolyzing by taking waste crops or wetland plant straws as carbon sources, and charging hydrolysate into an artificial wetland so as to improve the denitrification efficiency of the low-carbon high-nitrogen sewage. The invention simultaneously provides a treatment system, which is simple in structure, and scientific and reasonable in carbon source charging mode, and the denitrification effect of the low-carbon high-nitrogen sewage can be well realized by enhancing the artificial wetland through utilizing the plant carbon source. According to the method, the adopted plant carbon sources are cheap and easily available, the carbon release capability is strong, the bio-denitrification effect is good, and the hydrolysate is simple and practical to prepare, the carbon source charging mode is strong in continuous running capability, and the method is simple to maintain, less in secondary pollution, low in production cost, and capable of solving the technical difficulty of treating tail water in a sewage treatment plant with low carbon nitrogen ratio through artificial wetland by utilizing a simple method.
Description
Technical field
The present invention relates to technical field of sewage, be specifically related to a kind of method and system of plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification that utilize, be applicable to improve the nitric efficiency of low-carbon high-nitrogen polluted-water.
Background technology
Current most of sewage work carries out is secondary in < < urban wastewater treatment firm pollutant emission standard > > or the emission standard of one-level B, reach the emission standard that one-level A is even higher, generally all need sewage to carry out advanced treatment, this also will increase technical difficulty and the cost of sewage disposal greatly.The existing sewage work of China, particularly Shelter in South China Cities sewage treatment plant tail water height are nitrated and carbon source is not enough, and C/N is lower, are difficult to further carry out denitrogenation processing.Low-carbon high-nitrogen polluted-water is directly discharged into the sensitive water bodies such as river, lake, will cause a series of serious water pollution problemss, as body eutrophication etc.Utilize artificial swamp to carry out advanced treatment to sewage treatment plant tail water, water outlet reaches the higher existing many research of emission standard, yet carbon source deficiency has become the key factor of restriction artificial swamp to above-mentioned polluted-water nitrogen removal performance.
For above-mentioned artificial swamp, to the lower present situation of the further nitric efficiency of sewage treatment plant tail water, add selectively the denitrification denitrogenation effect that carbon source can effectively improve artificial swamp.The method solving is more common in liquid make-up carbon source in water inlet, as small molecule organic compounds such as methyl alcohol, formaldehyde, glucose and fructose, can effectively improve nitric efficiency, but these carbon sources can cause Wetland clogging, and operation cost is high, or the problem such as secondary pollution is larger.Have research by the direct landfill of plant carbon source material in the inner supplementary carbon source of wetland, but the rotten decomposition of plant needs for some time, and easily occurs Wetland clogging problem and increase in water outlet the problems such as hard-degraded substance, colourity increase.Also have vegetable material as the direct landfill of organic carbon source to improve the report of the nitric efficiency of artificial swamp, but the key issue that this technology runs in engineering is, the hydrolysis of vegetable material is first quick and back slow, accumulate the early stage that causes hydrolysis to discharge in a large number, and the middle and later periods discharges slowly, carbon source can not be stably provided, thus cause nitric efficiency and effluent quality unstable.Separately have the report that utilizes the vitriol oil hydrolyzing plant material of certain mass mark to be applied to again wetland, but the hydrolyzed solution chemical composition that this technology obtains changes, and pH value meta-acid, be not suitable for as the utilization of artificial swamp microorganism.
To adding the plant hydrolyzed liquid that is hydrolyzed under natural condition in artificial swamp as denitrification organic carbon source, can avoid adding organic micromolecular drawback, also overcome direct landfill vegetable material as the deficiency of carbon source, add plant hydrolyzed liquid as denitrification organic carbon source improve artificial swamp to tail water nitric efficiency have safe and efficient, continue the advantages such as renewable and secondary pollution is less, have research with plant hydrolyzed liquid such as Folium Cucumidis sativi and tomato hydrolyzed solution, Ipomoea batatas soak solution etc. as denitrifying carbon source raising sewage water denitrification efficiency.But different plant hydrolyzed liquid compositions is different, the effect of performance is different, the more important thing is that the difference of addition manner exists obvious difference to artificial swamp denitrification denitrogenation effect.
Summary of the invention
For existing artificial swamp, process the not good problem of low-carbon high-nitrogen sewage denitrification denitrification effect, the invention provides a kind of method of plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification of utilizing, utilize discarded farm crop or wetland plant stalk, and in conjunction with the dosing method of science, performance improves artificial swamp and processes low-carbon high-nitrogen sewage denitrification denitrification effect.
Another object of the present invention is to provide the system that realizes described method.
A further object of the invention is to provide the application of described method or system.
Object of the present invention is achieved by the following technical programs:
A kind of method of plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification of utilizing is provided, comprises the following steps:
S1. vegetable material is soaked to hydrolysis with soak solution and obtain hydrolyzed solution;
S2. S1 gained hydrolyzed solution is added to artificial swamp;
S3. add after the hydrolyzed solution of artificial swamp decomposes and discharge the low-molecular-weight organic matter that can be utilized by denitrifying bacteria, strengthened artificial wet land is to low-carbon high-nitrogen sewage water denitrification;
Wherein, described in S1, vegetable material is discarded farm crop or wetland plant stalk;
Described in S1, soak solution is water, and the mass volume ratio of described vegetable material and described soak solution, in g/mL, is 1:20～80;
Described in S1, hydrolysis is to be hydrolyzed into COD
crconcentration be 3000～4000 mg/L;
The interpolation volume of hydrolyzed solution described in S2, measures hydrolyzed solution COD before adding
crconcentration C, according to artificial swamp flooding quantity every day V
1and influent COD
crconcentration C
1concentration C with TN
2, according to required C/N ratio, calculate the interpolation volume V of hydrolyzed solution.Wherein hydrolyzed solution total nitrogen is ignored, and by under meter coutroi velocity, regulates and controls C/N ratio.Under concrete calculating: C/N ratio=total COD:TN=(CV+C
1v
1): (C
2v
1).
Described in S2, add is to add to artificial swamp middle level.
Preferably, described in S1, vegetable material is one or more mixture of giantreed, Canna generalis Bailey, cyperus alternifolius, bagasse or grass stalk.Vegetable material is discarded farm crop or wetland plant stalk, releases carbon ability strong, and wide material sources are cheap and easy to get and be second stage employ.
If adopt multiplely, preferably the usage ratio of various plants material is for waiting mass ratio.
Described vegetable material the simple pre-treatment such as cuts through collecting, clean, dry, cutting, and soaks hydrolysis at normal temperatures and pressures with the solid-to-liquid ratio of science, is hydrolyzed and is dipped to COD
crconcentration no longer change and reach stable, net filtration, collects filtrate after filtration, obtains.Soak time is about 5 days.
The present invention is through long-term a large amount of experimental study, and summary obtains, and above-mentioned vegetable material is in massfraction, and content of cellulose is 27～35%, and hemicellulose level is 12～20%, and content of lignin is 20～28%, and soluble lignin content is between 8～13%.Adopt above-mentioned vegetable material, it is strong that it releases carbon ability, directly adopt water as soak solution, realize hydrolysis under the suitable solid-liquid ratio condition of science, normal temperature and pressure conditions, hydrolysis process requires simple, be applicable to practical application, the hydrolyzed solution preparing adds to artificial swamp, under the effect of microorganism, progressively decomposes, and discharges the low-molecular-weight organic matter that can be utilized by denitrifying bacteria, remove sustainedly and stably the nitrogen in low carbon-nitrogen ratio sewage, greatly improve the nitric efficiency of wet land system.
Preferably, the mass volume ratio of vegetable material and described soak solution, in g/mL, is 1:20 described in S1.
Preferably, described in S2, adding is that the form with drip irrigation adds to artificial swamp middle level by hydrolyzed solution.The present invention sets hydrolyzed solution is directly added to artificial swamp middle level, avoids causing the inhibition to nitration reaction due to the decomposition and consumption dissolved oxygen of hydrolyzed solution.And the form of drip irrigation has guaranteed persistence and stability that carbon source provides.
Preferably, described artificial swamp middle level is the following 25～30cm in artificial swamp surface.
The inventive method can also be controlled the supplementary flow velocity of carbon source with under meter according to supplementary carbon source total amount and time length, stable constantly for system provides plant carbon source, and after interpolation carbon source, system is moved by original mode.
The present invention provides a kind of system that realizes described method simultaneously, a kind of system of plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification of utilizing, comprise carbon source adding set and artificial swamp, described carbon source adding set comprises that hydrolyzed solution discharges pond, carbon source supplements supervisor and carbon source is supplemented arm, described carbon source is supplemented supervisor one end and is communicated with hydrolyzed solution release pond, the other end is placed in artificial swamp top layer, and described carbon source is supplemented arm one end and is communicated with the supplementary supervisor of carbon source, and the other end gos deep into artificial swamp middle level.
The present invention sets up independent hydrolyzed solution at artificial swamp feed-water end and discharges pond, can provide into the power of water and realize effect of the present invention with gravitional force, does not consume energy.
Preferably, described artificial swamp is several unit, and surface arranges carbon source and supplements supervisor, and described carbon source is supplemented the supplementary arm of carbon source that supervisor is communicated with respectively this unit.
As one of optional scheme, the carbon source that described artificial swamp cell surface arranges is supplemented supervisor and is connected and be communicated with successively, and the first artificial wetland unit carbon source is supplemented supervisor one end and is communicated with hydrolyzed solution release pond.Preferably, described carbon source is supplemented between supervisor under meter is set.Preferably, in system of the present invention, each artificial wetland unit area is 50m
2, during thickness 40～60cm, can arrange the supplementary supervisor of 6 carbon sources, every carbon source is supplemented supervisor and is communicated with the supplementary arm of 8 carbon sources.
As two of optional scheme, one end that the carbon source of described artificial swamp cell surface setting is supplemented supervisor is communicated with respectively hydrolyzed solution release pond, and the other end is communicated with respectively the carbon source of this unit and supplements arm one end.Preferably, in system of the present invention, each artificial wetland unit area is 50m
2, during thickness 40～60cm, can arrange the supplementary supervisor of 6 carbon sources, every carbon source is supplemented supervisor and is communicated with the supplementary arm of 8 carbon sources.
Preferably, described carbon source is supplemented the pvc pipe of supervisor for being evenly arranged with certain spacing.Described spacing is preferably 50～60cm.
Preferably, described carbon source supplement arm be evenly drilled with aperture be 1～2mm to water hole.Supplement liquid and supplement with the form of drip irrigation, be preferably evenly drilled with 1.5mm to water hole.
Preferably, it is pvc pipe that described carbon source is supplemented arm, length 30cm, diameter is 2cm, be drilled with aperture and be 1.5mm to water hole.Supplementary hydrolyzed solution is supplemented to wetland middle level, and the inhibition of nitrification is reduced to minimum.
Preferably, described hydrolyzed solution arranges filtering net before discharging pond water outlet, effectively prevents that canebreak from entering wetland and causing and stop up and mosquitos and flies is created disturbances to, and release pond is further mounting cover also.
Described hydrolyzed solution discharges between pond and the supplementary supervisor of carbon source and under meter is set, coutroi velocity.
Preferably, described hydrolyzed solution release pond water exit position arranges filtering net.
Preferably, described hydrolyzed solution discharges between pond and the supplementary supervisor of carbon source under meter is set.
The present invention provides the application of described method and system simultaneously, is specifically applied to improve artificial swamp to the sanitary sewage of low-carbon high-nitrogen, surface water and/or treatment plant's tail water denitrogenation processing efficiency aspect.
The present invention has following beneficial effect:
It is not good that prior art utilizes Wastewater Treatment by Constructed Wetlands to realize denitrification effect, or complex process, be difficult to promote, or the material cost of using is higher, and what have also needs to use strong acid, and not environmental protection is also dangerous.The present invention sums up scientific and reasonable technical scheme, effectively utilize discarded farm crop or wetland plant stalk, adopt water as soak solution, prepare hydrolyzed solution, further adopt the dosing method of science to add to artificial swamp, stable continue provide plant carbon source for system, the not high problem of low-carbon high-nitrogen sewage denitrification nitric efficiency that solution causes due to carbon source deficiency, processing condition are gentle, simple, cost is lower, has important actual application value.The vegetable material economy that the present invention adopts is easy to get, and releases that carbon ability is strong and biological denitrification denitrification effect is better, is beneficial to the second stage employ of waste plant straws; Plant carbon source hydrolyzed solution extracting method of the present invention is simple, and follow-up operation and maintenance management is simple; Plant hydrolyzed liquid of the present invention is that organic carbon source addition manner is stable convenient, and with low cost, persistence is strong, and running maintenance is simple, and secondary pollution is little.The present invention has solved artificial swamp to the low technical barrier of low-carbon high-nitrogen sewage water denitrification processing efficiency with simple method, also solves the concrete technical problems such as the screening of vegetable material, the adding set of the preparation of hydrolyzed solution, carbon source and addition manner simultaneously.
The present invention further provides the system that realizes the inventive method, simple in structure, application efficiency is high, and follow-up operation and maintenance management is simple, and addition manner is stable convenient, and persistence is strong, and running maintenance is simple, and secondary pollution is little.
Accompanying drawing explanation
One of Fig. 1 system architecture schematic diagram of the present invention.
Two of Fig. 2 system architecture schematic diagram of the present invention.
Three of Fig. 3 system architecture schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, unless stated otherwise, the materials such as the artificial swamp matrix the present invention relates to, reagent are the conventional material using in this area.
Embodiment 1
The present embodiment provides a kind of system of plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification of utilizing, and primary structure is shown in shown in accompanying drawing 1, in accompanying drawing 1,1 for hydrolyzed solution discharges pond, and 2 supplement supervisor for carbon source, and 3 is the supplementary arm of carbon source, 4 is wetland plant, and 5 is matrix.
This artificial wet land system is positioned at region, Huizhou City, and utilizing treatment scale is 500 m
3the combined type artificial wetland of/d carries out advanced treatment to low-carbon high-nitrogen sewage treatment plant tail water.Treatment step is as follows:
S1. vegetable material is soaked to hydrolysis with soak solution and obtain hydrolyzed solution;
S2. S1 gained hydrolyzed solution is added to artificial swamp;
S3. add after the hydrolyzed solution of artificial swamp decomposes and discharge the low-molecular-weight organic matter that can be utilized by denitrifying bacteria, strengthened artificial wet land is to low-carbon high-nitrogen sewage water denitrification.
Particularly, collect giantreed, clean, dry, cut and the pre-treatment such as cut, be placed in hydrolyzed solution and discharge pond, the ratio that is 1g:20mL according to the solid-to-liquid ratio of giantreed and water is soaked, giantreed hydrolysis under normal temperature and pressure.Be hydrolyzed into the 5th day, concentration no longer changes and reaches stable, and gained hydrolyzed solution concentration is at 3000～4000 mg/L.
In artificial swamp, arrange carbon source throwing device, described carbon source adding set comprises that hydrolyzed solution discharges pond 1, carbon source supplements supervisor 2 and carbon source is supplemented arm 3, described carbon source is supplemented supervisor 2 one end and is communicated with hydrolyzed solution release pond 1, the other end is placed in artificial swamp top layer, described carbon source is supplemented arm 3 one end and is communicated with the supplementary supervisor 2 of carbon source, and the other end gos deep into artificial swamp middle level.6 PVC carbon sources of each cell layout are supplemented supervisor.Every supervisor is communicated with 8 carbon sources and supplements arm, 48 of the total arms in each unit.Arm is length 30 cm, and being evenly drilled with aperture 1.5 mm is the pvc pipe of 2 cm to the diameter in water hole, extends to wetland middle level.For preventing that canebreak from entering wetland and causing and stop up and mosquitos and flies is created disturbances to, discharge pond and filter screen is installed and is added a cover.
Hydrolyzed solution discharges the hydrolyzed solution in pond, with gravitional force, provides the power into water, and hydrolyzed solution discharges between pond and the supplementary supervisor of carbon source and is connected with under meter coutroi velocity.Before adding, measure the concentration C of hydrolyzed solution CODcr, according to artificial swamp flooding quantity every day V
1and the concentration C of influent COD cr
1concentration C with TN
2.According to required C/N ratio, calculate annex solution volume V.Wherein hydrolyzed solution total nitrogen is ignored, and by under meter coutroi velocity, regulates and controls C/N ratio.Under concrete calculating: C/N ratio=total COD:TN=(CV+C
1v
1): (C
2v
1).According to supplementary carbon source total amount (V) and time length, with under meter, control the supplementary flow velocity of carbon source, stable continue for system provides plant carbon source, add carbon source after system by original mode, move.
Artificial swamp operation scheme adopts intermittent type to enter sewage, and the even cloth of water inlet pipe is on artificial swamp top layer, water inlet 12 h, intermittently 12 h.Hydraulic load is by 1.0 m
3/ (m
2d) operation.
Influent COD cr concentration is in 20 mg/L left and right, and the CODcr concentration of intaking after supplementary hydrolyzed solution can reach 85.5 mg/L, and TN concentration is at 3.97～15.76 mg/L, NO
3-N 2.9～11.2 mg/L.
Experimental result shows, adding plant hydrolyzed liquid, to regulate C/N be 8, when hydraulic load is 1.0 m/d, moves, and each index all can reach good removal effect: TN clearance can be up to 40 %, and removing load is 1.92 g. (m
2.d)
-1, NO
3-N clearance can Da Keda 35 % left and right, removing load is 1.34 g. (m
2.d)
-1, ammonia nitrogen, because influent concentration is lower, almost can all be removed, and after interpolation carbon source, water outlet CODcr is basicly stable can not cause secondary pollution in 10 mg/L left and right, obviously improves nitric efficiency.
Embodiment 2
The present embodiment provides a kind of system of plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification of utilizing, and primary structure is with embodiment 1.
This artificial wet land system is positioned at region, Huizhou City, and utilizing treatment scale is 500 m
3the combined type artificial wetland of/d is to low-carbon high-nitrogen, and the higher city river sewage of ammonia nitrogen concentration carries out advanced treatment.Treatment step is as follows:
S1. vegetable material is soaked to hydrolysis with soak solution and obtain hydrolyzed solution;
S2. S1 gained hydrolyzed solution is added to artificial swamp;
S3. add after the hydrolyzed solution of artificial swamp decomposes and discharge the low-molecular-weight organic matter that can be utilized by denitrifying bacteria, strengthened artificial wet land is to low-carbon high-nitrogen sewage water denitrification.
Particularly, collect Canna generalis Bailey and bagasse, the ratio that is in mass ratio 1:1 is mixed, clean, dry, cut and the pre-treatment such as cut, be placed in hydrolyzed solution and discharge pond, the ratio that is 1g:20mL according to Canna generalis Bailey and the quality of bagasse mixture and the solid-to-liquid ratio of water is soaked, Canna generalis Bailey and bagasse hydrolysis under normal temperature and pressure.Be hydrolyzed into the 5th day, concentration no longer changes and reaches stable, and gained hydrolyzed solution concentration is at 3000～4000 mg/L.
In artificial swamp, arrange carbon source throwing device, described carbon source adding set comprises that hydrolyzed solution discharges pond 1, carbon source supplements supervisor 2 and carbon source is supplemented arm 3, described carbon source is supplemented supervisor 2 one end and is communicated with hydrolyzed solution release pond 1, the other end is placed in artificial swamp top layer, described carbon source is supplemented arm 3 one end and is communicated with the supplementary supervisor 2 of carbon source, and the other end gos deep into artificial swamp middle level.Each unit is arranged the supplementary supervisor of 6 PVC carbon sources altogether.Every supervisor connects 8 carbon sources and supplements arm, 48 of the total arms in each unit.Arm is length 30 cm, and being evenly drilled with aperture 1.5 mm is the pvc pipe of 2 cm to the diameter in water hole, extends to wetland middle level.For preventing that canebreak from entering wetland and causing and stop up and mosquitos and flies is created disturbances to, discharge pond and filter screen is installed and is added a cover.
Hydrolyzed solution discharges the hydrolyzed solution in pond, with gravitional force, provides the power into water, and hydrolyzed solution discharges between pond and the supplementary supervisor of carbon source and is connected with under meter coutroi velocity.Before adding, measure the concentration C of hydrolyzed solution CODcr, according to artificial swamp flooding quantity every day V
1and the concentration C of influent COD cr
1concentration C with TN
2.According to required C/N ratio, calculate annex solution volume V.Wherein hydrolyzed solution total nitrogen is ignored, and by under meter coutroi velocity, regulates and controls C/N ratio.Under concrete calculating: C/N ratio=total COD:TN=(CV+C
1v
1): (C
2v
1).According to supplementary carbon source total amount (V) and time length, with under meter, control the supplementary flow velocity of carbon source, stable continue for system provides plant carbon source, add carbon source after system by original mode, move.
Artificial swamp operation scheme adopts intermittent loading, and the even cloth of water inlet pipe is on artificial swamp top layer, water inlet 12 h, intermittently 12 h.Hydraulic load is by 1.0 m
3/ (m
2d) operation.
Influent COD cr concentration is in 17 mg/L left and right, and the CODcr concentration of intaking after supplementary hydrolyzed solution can reach 86.2 mg/L, and TN concentration is at 10～14 mg/L, NO
3 --N2.9～9 mg/L, NH
4 +-N 3～8 mg/L.
Experimental result shows, adding plant hydrolyzed liquid, to regulate C/N be 8, when hydraulic load is 1.0 m/d, moves, and each index all can reach good removal effect: TN clearance can be up to 45 %, and removing load is 2.25 m
3/ (m
2d), NH
4 +-N clearance can Da Keda 43 % left and right, removing load is 1.78 m
3/ (m
2d), NO
3 --N clearance can Da Keda 43 % left and right, removing load is 1.8 m
3/ (m
2d), after interpolation carbon source, water outlet CODcr is basicly stable can not cause secondary pollution in 10 mg/L left and right, obviously improves nitric efficiency.
Embodiment 3
Other are with embodiment 2, and different is that solid-to-liquid ratio is 1:30.
Artificial swamp operation scheme adopts intermittent loading, and the even cloth of water inlet pipe is on artificial swamp top layer, water inlet 12 h, intermittently 12 h.Hydraulic load is by 1.0 m
3/ (m
2d) operation.
Influent COD cr concentration is in 20 mg/L left and right, and the CODcr concentration of intaking after supplementary hydrolyzed solution can reach 65.5 mg/L, and TN concentration is at 10.2～14.8 mg/L, NO
3 --N2.9～9.2 mg/L, NH
4 +-N 3～8.1 mg/L.
Experimental result shows, now press example 2 controlled hydrolysis flow quantities, adding plant hydrolyzed liquid adjusting C/N is only 6 left and right, when hydraulic load is 1.0 m/d, moves, each index all can reach good removal effect: TN clearance can be up to 35 %, and removing load is 1.8 m
3/ (m
2d), NH
4 +-N clearance can Da Keda 45 % left and right, removing load is 1.69 m
3/ (m
2d), NO
3 --N clearance can Da Keda 40 % left and right, removing load is 1.6 g. (m
2.d)
-1, after interpolation carbon source, water outlet CODcr is basicly stable can not cause secondary pollution in 10 mg/L left and right, obviously improves nitric efficiency.
Embodiment 4
Other are with embodiment 2, and different is not establish carbon source to supplement arm, supplement supervisor hydrolyzed solution is added and artificial swamp surface with 6 carbon sources, and hydrolyzed solution slowly infiltrates artificial swamp matrix voluntarily.
Artificial swamp operation scheme adopts intermittent loading, and the even cloth of water inlet pipe is on artificial swamp top layer, water inlet 12 h, intermittently 12 h.Hydraulic load is by 1.0 m
3/ (m
2d) operation.
Influent COD cr concentration is in 19 mg/L left and right, and the CODcr concentration of intaking after supplementary hydrolyzed solution can reach 87.2 mg/L, and TN concentration is at 10～14.6 mg/L, NO
3 --N 2.9～9.2 mg/L, NH
4 +-N 3.4～8.3 mg/L.
Experimental result shows, adding plant hydrolyzed liquid, to regulate C/N be 8, when hydraulic load is 1.0 m/d, moves, and each index all can reach good removal effect: TN clearance can, up to 42 %, be removed load for 2.1m
3/ (m
2d), NH
4 +-N clearance can Da Keda 28 % left and right, remove load for 1.12m
3/ (m
2d), NO
3 --N clearance can Da Keda 43 % left and right, removing load is 1.8 m
3/ (m
2d), after interpolation carbon source, water outlet CODcr is basicly stable can not cause secondary pollution in 10 mg/L left and right, obviously improves nitric efficiency.
Embodiment 5
Other are with embodiment 2, and different is that 3 PVC carbon sources of each cell layout are supplemented supervisor.Every supervisor connects 4 carbon sources and supplements arm, and arm is length 30 cm, and being evenly drilled with aperture 1.5 mm is the pvc pipe of 2 cm to the diameter in water hole, extends to wetland middle level.
Artificial swamp operation scheme adopts intermittent loading, and the even cloth of water inlet pipe is on artificial swamp top layer, water inlet 12 h, intermittently 12 h.Hydraulic load is by 1.0 m
3/ (m
2d) operation.
Influent COD cr concentration is in 20 mg/L left and right, and the CODcr concentration of intaking after supplementary hydrolyzed solution can reach 87.1 mg/L, and TN concentration is at 10～14.6 mg/L, NO
3 --N2.9～9.2 mg/L, NH
4 +-N 3.4～8.3 mg/L.
Experimental result shows, adding plant hydrolyzed liquid, to regulate C/N be 8, when hydraulic load is 1.0 m/d, moves, and each index all can reach good removal effect: TN clearance can be up to 43 %, and removing load is 2.14 m
3/ (m
2d), NH
4 +-N clearance can Da Keda 34 % left and right, removing load is 1.36 m
3/ (m
2d), NO
3 --N clearance can Da Keda 40 % left and right, removing load is 1.62 m
3/ (m
2d), after interpolation carbon source, water outlet CODcr is basicly stable can not cause secondary pollution in 11 mg/L left and right, obviously improves nitric efficiency.
Embodiment 6
The present embodiment provides a kind of system of plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification of utilizing, primary structure is shown in shown in accompanying drawing 2, in accompanying drawing 2,1 is hydrolyzed solution release pond, 2 supplement and are responsible for for first module carbon source, 3 supplement arm for first module carbon source, and 4 is first module wetland plant, and 5 is first module matrix; 6 supplement supervisor for second unit carbon source, and 7 supplement arm for second unit carbon source, and 8 is second unit wetland plant, and 9 is second unit matrix.
This artificial wet land system is positioned at territory, Community of Guangzhou City, and utilizing treatment scale is 500 m
3the combined type artificial wetland of/d carries out advanced treatment to low-carbon high-nitrogen sewage treatment plant tail water.Treatment step is as follows:
S1. vegetable material is soaked to hydrolysis with soak solution and obtain hydrolyzed solution;
S2. S1 gained hydrolyzed solution is added to artificial swamp;
S3. add after the hydrolyzed solution of artificial swamp decomposes and discharge the low-molecular-weight organic matter that can be utilized by denitrifying bacteria, strengthened artificial wet land is to low-carbon high-nitrogen sewage water denitrification.
Particularly, collect cyperus alternifolius, clean, dry, cut and the pre-treatment such as cut, be placed in hydrolyzed solution and discharge pond, the ratio that is 1g:20mL according to the solid-to-liquid ratio of cyperus alternifolius and water is soaked, cyperus alternifolius hydrolysis under normal temperature and pressure.Be hydrolyzed into the 5th day, concentration no longer changes and reaches stable, and gained hydrolyzed solution concentration is at 3000～4000 mg/L.
In first module and second unit artificial swamp, arrange respectively carbon source throwing device, described carbon source adding set comprises that hydrolyzed solution discharges pond 1, first module carbon source supplements supervisor 2 and first module carbon source is supplemented arm 3, second unit carbon source supplements supervisor 6 and second unit carbon source is supplemented arm 7, and the supplementary supervisor 2 of first module carbon source is communicated with second unit carbon source and supplements supervisor 6.Described first module carbon source is supplemented supervisor 2 one end and is communicated with hydrolyzed solution release pond 1, the other end is placed in first module artificial swamp top layer, described first module carbon source is supplemented arm 3 one end and is communicated with the supplementary supervisor 2 of first module carbon source, and the other end gos deep into first module artificial swamp middle level; Described second unit carbon source is supplemented supervisor 6 one end and is communicated with the supplementary supervisor 2 of first module carbon source, the other end is placed in second unit artificial swamp top layer, described second unit carbon source is supplemented arm 7 one end and is communicated with the supplementary supervisor 6 of second unit carbon source, and the other end gos deep into second unit artificial swamp middle level.6 PVC carbon sources of each cell layout are supplemented supervisor.Every supervisor connects 8 carbon sources and supplements arm, 48 of the total arms in each unit.Arm is length 30 cm, and being evenly drilled with aperture 1.5 mm is the pvc pipe of 2 cm to the diameter in water hole, extends to wetland middle level.For preventing that canebreak from entering wetland and causing and stop up and mosquitos and flies is created disturbances to, discharge pond and filter screen is installed and is added a cover.
Hydrolyzed solution discharges the hydrolyzed solution in pond, with gravitional force, provides the power into water, and hydrolyzed solution discharges between pond and the supplementary supervisor of carbon source and is connected with under meter coutroi velocity.Before adding, measure the concentration C of hydrolyzed solution CODcr, according to artificial swamp flooding quantity every day V
1and the concentration C of influent COD cr
1concentration C with TN
2.According to required C/N ratio, calculate annex solution volume V.Wherein hydrolyzed solution total nitrogen is ignored, and by under meter coutroi velocity, regulates and controls C/N ratio.Under concrete calculating: C/N ratio=total COD:TN=(CV+C
1v
1): (C
2v
1).According to supplementary carbon source total amount (V) and time length, with under meter, control the supplementary flow velocity of carbon source, stable continue for system provides plant carbon source, add carbon source after system by original mode, move.
Artificial swamp operation scheme adopts intermittent loading, and the even cloth of water inlet pipe is on artificial swamp top layer, water inlet 12 h, intermittently 12 h.Hydraulic load is by 1.0 m
3/ (m
2d) operation.
Influent COD cr concentration is in 16 mg/L left and right, and the CODcr concentration of intaking after supplementary hydrolyzed solution can reach 89.2 mg/L, and TN concentration is at 4.02～14.76 mg/L, NO
3 --N 3.1～12.2 mg/L.
Experimental result shows, adding plant hydrolyzed liquid, to regulate C/N be 8, when hydraulic load is 1.0 m/d, moves, and each index all can reach good removal effect: TN clearance can be up to 47 %, and removing load is 2.58 m
3/ (m
2d), NO
3 --N clearance can Da Keda 43 % left and right, removing load is 2.05 m
3/ (m
2d), ammonia nitrogen, because influent concentration is lower, almost can all be removed, and after interpolation carbon source, water outlet CODcr is basicly stable can not cause secondary pollution in 12 mg/L left and right, obviously improves nitric efficiency.
Embodiment 7
The present embodiment provides a kind of system of plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification of utilizing, primary structure is shown in shown in accompanying drawing 3, in accompanying drawing 3,1 is hydrolyzed solution release pond, 2 supplement and are responsible for for first module carbon source, 3 supplement arm for first module carbon source, and 4 is first module wetland plant, and 5 is first module matrix; 6 supplement supervisor for second unit carbon source, and 7 supplement arm for second unit carbon source, and 8 is second unit wetland plant, and 9 is second unit matrix.
This artificial wet land system is positioned at region, Guangdong Province, and utilizing treatment scale is 500 m
3the combined type artificial wetland of/d carries out advanced treatment to low-carbon high-nitrogen sewage treatment plant tail water.Treatment step is as follows:
S1. vegetable material is soaked to hydrolysis with soak solution and obtain hydrolyzed solution;
S2. S1 gained hydrolyzed solution is added to artificial swamp;
S3. add after the hydrolyzed solution of artificial swamp decomposes and discharge the low-molecular-weight organic matter that can be utilized by denitrifying bacteria, strengthened artificial wet land is to low-carbon high-nitrogen sewage water denitrification.
Particularly, collect bagasse and grass stalk (mass ratio 1:1), clean, dry, cut and the pre-treatment such as cut, be placed in hydrolyzed solution and discharge pond, the ratio that is 1g:20mL according to the solid-to-liquid ratio of cyperus alternifolius and water is soaked, bagasse and grass stalk hydrolysis under normal temperature and pressure.Be hydrolyzed into the 5th day, concentration no longer changes and reaches stable, and gained hydrolyzed solution concentration is at 3000～4000 mg/L.
In first module and second unit artificial swamp, arrange respectively carbon source throwing device, described carbon source adding set comprises that hydrolyzed solution discharges pond 1, first module carbon source supplements supervisor 2 and first module carbon source is supplemented arm 3, second unit carbon source supplements supervisor 6 and second unit carbon source is supplemented arm 7, first module carbon source supplements supervisor 2 and the supplementary supervisor of second unit carbon source 6 one end are communicated with respectively hydrolyzed solution release pond 1, the other end is placed in respectively first module artificial swamp top layer and second unit artificial swamp top layer, described first module carbon source is supplemented arm 3 one end and is communicated with the supplementary supervisor 2 of first module carbon source, the other end gos deep into first module artificial swamp middle level, described second unit carbon source is supplemented supervisor 6 one end and is communicated with the supplementary supervisor 2 of first module carbon source, the other end is placed in second unit artificial swamp top layer, described second unit carbon source is supplemented arm 7 one end and is communicated with the supplementary supervisor 6 of second unit carbon source, and the other end gos deep into second unit artificial swamp middle level.6 PVC carbon sources of each cell layout are supplemented supervisor.Every supervisor connects 8 carbon sources and supplements arm, 48 of the total arms in each unit.Arm is length 30 cm, and being evenly drilled with aperture 1.5 mm is the pvc pipe of 2 cm to the diameter in water hole, extends to wetland middle level.For preventing that canebreak from entering wetland and causing and stop up and mosquitos and flies is created disturbances to, discharge pond and filter screen is installed and is added a cover.
Hydrolyzed solution discharges the hydrolyzed solution in pond, with gravitional force, provides the power into water, and hydrolyzed solution discharges between pond and the supplementary supervisor of carbon source and is connected with under meter coutroi velocity.Before adding, measure the concentration C of hydrolyzed solution CODcr, according to artificial swamp flooding quantity every day V
1and the concentration C of influent COD cr
1concentration C with TN
2.According to required C/N ratio, calculate annex solution volume V.Wherein hydrolyzed solution total nitrogen is ignored, and by under meter coutroi velocity, regulates and controls C/N ratio.Under concrete calculating: C/N ratio=total COD:TN=(CV+C
1v
1): (C
2v
1).According to supplementary carbon source total amount (V) and time length, with under meter, control the supplementary flow velocity of carbon source, stable continue for system provides plant carbon source, add carbon source after system by original mode, move.
Artificial swamp operation scheme adopts intermittent loading, and the even cloth of water inlet pipe is on artificial swamp top layer, water inlet 12 h, intermittently 12 h.Hydraulic load is by 1.0 m
3/ (m
2d) operation.
Influent COD cr concentration is in 20 mg/L left and right, and the CODcr concentration of intaking after supplementary hydrolyzed solution can reach 87.8 mg/L, and TN concentration is at 3.67～15.96 mg/L, NO
3 --N 2.4～12.2 mg/L.
Experimental result shows, adding plant hydrolyzed liquid, to regulate C/N be 8, when hydraulic load is 1.0 m/d, moves, and each index all can reach good removal effect: TN clearance can be up to 42 %, and removing load is 2.12 m
3/ (m
2d), NO
3 --N clearance can Da Keda 41 % left and right, removing load is 1.72 m
3/ (m
2d), ammonia nitrogen, because influent concentration is lower, almost can all be removed, and after interpolation carbon source, water outlet CODcr is basicly stable can not cause secondary pollution in 10 mg/L left and right, obviously improves nitric efficiency.
Claims (10)
1. utilize the method for plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification, it is characterized in that, comprise the following steps:
S1. vegetable material is soaked to hydrolysis with soak solution and obtain hydrolyzed solution;
S2. S1 gained hydrolyzed solution is added to artificial swamp;
S3. add after the hydrolyzed solution of artificial swamp decomposes and discharge the low-molecular-weight organic matter that can be utilized by denitrifying bacteria, strengthened artificial wet land is to low-carbon high-nitrogen sewage water denitrification;
Wherein, described in S1, vegetable material is discarded farm crop or wetland plant stalk;
Described in S1, soak solution is water, and the mass volume ratio of described vegetable material and described soak solution, in g/mL, is 1:20～80;
Described in S1, hydrolysis is to be hydrolyzed into COD
crconcentration be 3000～4000 mg/L;
Described in S2, add is to add to artificial swamp middle level.
2. utilize according to claim 1 the method for plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification, it is characterized in that, vegetable material is one or more mixture of giantreed, Canna generalis Bailey, cyperus alternifolius, bagasse or grass stalk described in S1.
3. utilize according to claim 1 the method for plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification, it is characterized in that, the mass volume ratio of vegetable material and described soak solution, in g/mL, is 1:20 described in S1.
4. utilize according to claim 1 the method for plant carbon source strengthened artificial wet land to low-carbon high-nitrogen sewage water denitrification, it is characterized in that, described artificial swamp middle level is the following 25～30cm in artificial swamp surface.
5. the application of method described in claim 1 to 4 any one, is characterized in that, is applied to improve artificial swamp to the sanitary sewage of low-carbon high-nitrogen, surface water and/or treatment plant's tail water denitrogenation processing efficiency aspect.
6. a system that realizes method described in claim 1 to 4 any one, it is characterized in that, comprise carbon source adding set and artificial swamp, described carbon source adding set comprises that hydrolyzed solution discharges pond, carbon source supplements supervisor and carbon source is supplemented arm, described carbon source is supplemented supervisor one end and is communicated with hydrolyzed solution release pond, the other end is placed in artificial swamp top layer, and described carbon source is supplemented arm one end and is communicated with the supplementary supervisor of carbon source, and the other end gos deep into artificial swamp middle level.
7. system according to claim 6, is characterized in that, described artificial swamp is several unit,
Surface arranges carbon source and supplements supervisor, and described carbon source is supplemented the supplementary arm of carbon source that supervisor is communicated with respectively this unit; The carbon source that described artificial swamp cell surface arranges is supplemented supervisor and is connected and be communicated with successively, and the first artificial wetland unit carbon source is supplemented supervisor one end and is communicated with hydrolyzed solution release pond.
8. system according to claim 7, is characterized in that, each artificial wetland unit area is 50m
2, thickness 40～60cm, arranges the supplementary supervisor of 6 carbon sources, every carbon source is supplemented supervisor and is communicated with the supplementary arm of 8 carbon sources; It is pvc pipe that described carbon source is supplemented arm, length 30cm, diameter is 2cm, be drilled with aperture and be 1.5mm to water hole.
9. system according to claim 6, is characterized in that, described artificial swamp is several unit,
Each artificial wetland unit surface arranges carbon source and supplements supervisor, and described carbon source is supplemented the supplementary arm of carbon source that supervisor is communicated with respectively this unit; One end that the carbon source of described artificial swamp cell surface setting is supplemented supervisor is communicated with respectively hydrolyzed solution release pond, and the other end is communicated with respectively the carbon source of this unit and supplements arm one end.
10. according to the system described in claim 1,2,3,4 or 5, it is characterized in that, described hydrolyzed solution discharges pond water exit position filtering net is set; Described hydrolyzed solution discharges between pond and the supplementary supervisor of carbon source under meter is set.
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