CN203976470U - A kind of denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage - Google Patents
A kind of denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage Download PDFInfo
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- CN203976470U CN203976470U CN201320753830.2U CN201320753830U CN203976470U CN 203976470 U CN203976470 U CN 203976470U CN 201320753830 U CN201320753830 U CN 201320753830U CN 203976470 U CN203976470 U CN 203976470U
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Abstract
The utility model discloses a kind of denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage, and described system comprises equalizing tank, lift pump, denitrification pond and water collecting basin; Described lift pump is arranged between equalizing tank and denitrification pond, is provided with feed-water end and water side on described lift pump, and the feed-water end of described lift pump is connected with equalizing tank by pipeline, and the water side of described lift pump is connected with described denitrification pond; Described denitrification pond is connected by pipeline with water collecting basin; In described denitrification pond, be disposed with waterflooding layer, slowly-releasing carbon source layer, packing layer, anti seepage membrane and supporting layer from top to bottom.The utility model is applicable to the low carbon-nitrogen ratio sewages such as river, underground water, digested sludge supernatant liquor and the water outlet of city B-grade sewage treatment plant, and system device is simple, convenient operation and management and non-secondary pollution.And add wide material sources, cheap, the slow and manageable solid-state slowly-releasing carbon source of carbon source release, improved the removal to nitre nitrogen and total nitrogen, improve the processing power of whole technique.
Description
Technical field
The utility model relates to environmental engineering water-treatment technology field, relates in particular to a kind of denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage.
Background technology
The water outlet TN concentration requirement of city B-grade sewage factory is lower than " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level A standard, and water outlet TN concentration is less than 15mg/L.Along with rapid development of economy, nitrogen and organicly constantly leak into, causes lake, reservoir water body increasingly to worsen, and body eutrophication problem is quite outstanding.Polluted by nitrogen control more and more comes into one's own, and becomes the current and vital task of a water pollution control job in period from now on.City B-grade sewage plant effluent feature is that nitrogen major part in sewage is with NO
3 --N form exists, and small portion is with NH
3-N form exists.In this type of sewage, organic carbon content is lower, is difficult for being utilized by denitrifying bacterium, is difficult to meet the demand to carbon source in denitrification process, causes nitric efficiency lower.
In biological denitrification filtration system, denitrifying bacterium can utilize carbon source as electron donor, NO
3 --N becomes N as electron acceptor(EA) by nitrate reduction
2, reach the object of denitrogenation.Many scholars carry out denitrifying research and probe by adding the liquid carbon source such as methyl alcohol, glucose, easily cause carbon source to add deficiency or excessive but add these carbon sources, not only increase denitrification cost, system operation complexity and secondary pollution problem more outstanding.Thereby many investigators find nontoxic, cheap solid-state carbon source by number of ways and replace conventional liquid carbon source in recent years.Solid carbon source is broadly divided into two classes: a class is natural materials, the material of the rich cellulose such as such as rice husk, corn cob and ageing rice; Another kind of is polymkeric substance by synthetic, as PBS (poly butylene succinate), PHB (poly-β-hydroxybutyric acid) etc.Solid slow-release carbon source has the feature of slow release carbon source, ensures that the sustainable of anti-nitration reaction carries out, and its research is subject to people's favor gradually.
More and more stricter to total amount of pollutant control during " 12 ", municipal effluent plant effluent TN concentration only needed to reach 15mg/L in the past, was difficult to meet the control requirement to pollutent under the new situation.In order to prevent the aggravation of body eutrophication, water outlet TN concentration need maintain lower scope with interior (5mg/L following), therefore in the urgent need to easy to operate, effective, treatment process cheaply.Therefore, the treatment technology of existing low carbon-nitrogen ratio sewage has yet to be improved and developed.
Utility model content
In view of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage, is intended to solve the problem that prior art is lower to low carbon-nitrogen ratio sewage nitric efficiency.
The technical solution of the utility model is as follows:
For the treatment of a denitrification filtration system for low carbon-nitrogen ratio sewage, wherein, described denitrification filtration system comprises equalizing tank, lift pump, denitrification pond and water collecting basin;
Described lift pump is arranged between described equalizing tank and denitrification pond, on described lift pump, be provided with feed-water end and water side, the feed-water end of described lift pump is connected with described equalizing tank by pipeline, the water side of described lift pump is connected with described denitrification pond, and described denitrification pond is connected by pipeline with water collecting basin;
In described denitrification pond, be disposed with waterflooding layer, slowly-releasing carbon source layer, packing layer, anti seepage membrane and supporting layer from top to bottom.
The described denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage, wherein, the slowly-releasing carbon source layer top layer in described denitrification pond is provided with water-distributing device, at the bottom of the pond in described denitrification pond, is provided with captation; Described water-distributing device is connected with the water side of described lift pump by pipeline; Described captation is connected by pipeline with described water collecting basin.
The described denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage, wherein, the height of described waterflooding layer is 0.3-0.4m; The height of described slowly-releasing carbon source layer is 2-5mm; The height of described packing layer is 0.8-1.4m; The height of described supporting layer is 0.3-0.5m.
The described denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage, wherein, is filled with thick river sand in described packing layer, the particle diameter of described thick river sand is 2-4mm; In described supporting layer, be filled with gravel, the particle diameter of gravel is 20-50mm; In described slowly-releasing carbon source layer, be filled with one or more in rice husk, corn cob and ageing rice.
The described denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage, wherein, water-distributing device in described denitrification pond is made up of in several water distribution branch pipes on slowly-releasing carbon source layer top layer with parallel being equally spaced water distribution supervisor, and oblique upper 60 ° of each water distribution branch pipe is evenly provided with several water distributing pores; Described captation is made up of in several headers of supporting layer bottom with parallel being equally spaced the supervisor that catchments, and each arm pipe bottom of catchmenting evenly arranges several gully-holes.
The described denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage, wherein, described anti seepage membrane is HDPE anti seepage membrane, the thickness of HDPE anti seepage membrane is 0.5-2.5mm.
The described denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage, wherein, described water collecting basin is provided with water-in and water outlet, and described water-in is connected by pipeline with the captation in described denitrification pond; The water outlet of described water collecting basin is connected with the discharge outlet of sewage by pipeline.
The described denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage, wherein, the water-in of described water collecting basin is arranged on the lower end of water collecting basin, and the water outlet of described water collecting basin is arranged on the upper end of water collecting basin.
Beneficial effect: the denitrification filtration system in the utility model, taking low carbon-nitrogen ratio sewage as object, using microorganism as main body, is controlled DO concentration in denitrification filtration system and is less than 0.5mg/L, creates the anaerobic environment that is beneficial to anti-nitration reaction; By adding the required slowly-releasing carbon source of anti-nitration reaction, microorganism can be on filler growth and breeding, within the shorter residence time, effectively remove the pollutents such as the nitrogen in sewage; The utility model is applicable to that city B-grade sewage treatment plant water outlet nitrogen concentration is low, and COD concentration is low, the low sewage disposal of carbon-nitrogen ratio, and system device is simple, convenient operation and management and non-secondary pollution.Denitrification filtration system and the method for the processing low carbon-nitrogen ratio sewage that the utility model provides, not only technical costs is low, total nitrogen removal effect is good, and it is stable significantly to strengthen organism, effluent index.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model for the treatment of the denitrification filtration system of low carbon-nitrogen ratio sewage.
Fig. 2 is the structural representation of the water-distributing device of denitrification filtration system.
Embodiment
The utility model provides a kind of denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage, for making the purpose of this utility model, technical scheme and effect clearer, clear and definite, below the utility model is further described.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
The utility model, in order to solve the problem of low carbon-nitrogen ratio sewage processing, provides a kind of technology taking equalizing tank, denitrification pond and water collecting basin as main process cell processing low carbon-nitrogen ratio sewage.Described low-carbon (LC) than the nitrogen major part in sewage with NO
3 --N form exists, and small portion is with NH
3-N form exists, and described low-carbon (LC) is lower than nitrate concentration in sewage, and nitrate concentration is no more than 30mg/L, organic content is low, and described organic concentration is no more than 150mg/L, is difficult for being utilized by denitrifying bacterium, be difficult to meet the demand to carbon source in denitrification process, cause nitric efficiency lower.
Denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage provided by the utility model, as shown in Figure 1, comprises equalizing tank 100, lift pump 200, denitrification pond 300 and water collecting basin 400;
Described lift pump 200 is arranged between described equalizing tank 100 and denitrification pond 300, on described lift pump 200, be provided with feed-water end and water side, the feed-water end of described lift pump 200 is connected with described equalizing tank 100 by pipeline, the water side of described lift pump 200 is connected with described denitrification pond 300, like this, the sewage in described equalizing tank 100 just can pump in denitrification pond 300 by lift pump 200; Described denitrification pond 300 is connected by pipeline with water collecting basin 400.
In described denitrification pond 300, be disposed with waterflooding layer 310, slowly-releasing carbon source layer 330, packing layer 340, anti seepage membrane 370 and supporting layer 350 from top to bottom; Slowly-releasing carbon source layer 330 top layer in described denitrification pond 300 are provided with water-distributing device 320, and 300 ends of described denitrification pond are provided with captation 360(and are arranged on the bottom of supporting layer 350).Described water-distributing device 320 is connected with the water side of described lift pump 200 by pipeline, and like this, the sewage in equalizing tank 100 enters 300 inside, described denitrification pond by described water-distributing device 320.
Described water collecting basin 400 is provided with water-in and water outlet, and described water-in is connected by pipeline with the captation 360 in described denitrification pond 300.Preferably, described water-in is arranged on the bottom of water collecting basin 400, and described water outlet is arranged on the upper end of water collecting basin 400, and the water outlet of described water collecting basin 400 is connected with the discharge outlet of sewage by pipeline.
Wherein, in described denitrification pond 300, the height of waterflooding layer 310 is 0.3-0.4m, and the height of slowly-releasing carbon source layer 330 is 2-5mm, and the height of packing layer 340 is 0.8-1.4m, and the height of supporting layer 350 is 0.3-0.4m.In described packing layer 340, be filled with thick river sand, sand grains footpath, thick river is 2-4mm, and permeability coefficient is 5-10 × 10
-5m/s; Supporting layer 350 is filled gravel, and grain size of gravel is 20-50mm.In described slowly-releasing carbon source layer 330, be filled with one or more solid slow-release carbon sources in rice husk, corn cob and ageing rice, the cycle that adds of solid slow-release carbon source is 20-40 days.Described anti seepage membrane 370 is HDPE anti seepage membrane, and the thickness of HDPE anti seepage membrane is 0.5-2.5mm, is layed on supporting layer 350.
Water-distributing device 320 in described denitrification pond 300 is made up of in several water distribution branch pipes 312 on slowly-releasing carbon source layer 330 top layer with parallel being equally spaced water distribution supervisor 311, and each water distribution branch pipe 312 is provided with multiple water distributing pores 313 for water distribution.Preferably, described each water distribution branch pipe 312 tiltedly upper 60 ° several water distributing pores 313 are evenly set.
Captation 360 in described denitrification pond 300 is made up of in several arms that catchment of supporting layer 350 bottoms with parallel being equally spaced the supervisor that catchments, and each arm bottom of catchmenting is uniformly distributed several gully-holes; The described supervisor that catchments is connected with water collecting basin 400 water-ins by pipeline; Water outlet is connected by pipeline with water port.
Adopt above-mentioned denitrification filtration system to process the method for low carbon-nitrogen ratio sewage, comprise the steps:
1. sewage enters equalizing tank, even water quality and quantity in equalizing tank;
2. the sewage in equalizing tank pumps into denitrification pond by lift pump: lift pump is connected with the water distribution supervisor of the water-distributing device in denitrification pond, and sewage is by water distribution branch pipe water distribution uniformity; The sewage entering in denitrification pond evenly flows into by water-distributing device in the waterflooding layer in denitrification pond, then by diafiltration successively by slowly-releasing carbon source layer, packing layer and the supporting layer in denitrification pond: in denitrification pond, hydraulic detention time is 2-4h;
3. sewage is collected by the supervisor that catchments of supporting layer bottom, and flow in water collecting basin, finally discharges by water outlet.
Wherein, in denitrification device, waterflooding layer completely cuts off air, makes waterflooding layer lower part in anaerobic environment; In slowly-releasing carbon source layer, filler can discharge carbon source, and it is 20-40 days that filler adds the cycle; Filling surface attached biological film in packing layer, under anaerobic environment, the carbon source of utilizing slowly-releasing carbon source layer to discharge, carries out denitrification denitrogenation.
Device of the present utility model by aqueous process streams to order formed by equalizing tank, denitrification pond and equalizing tank.Equalizing tank is used for the water quality and quantity of homogenizing water inlet, ensures water inlet continous-stable.In denitrification pond, adding natural solid slowly-releasing carbon source, improve organic concentration in water inlet, provide microorganism denitrification required carbon source, is the key link of degradation of sewage denitrogenation.The denitrification residence time is 2-4h, and water collecting basin is mainly to collect water outlet, concentrates discharge.
In denitrification pond, the selection of slowly-releasing carbon source and dosage, the cycle of adding are the key factors that affects low carbon-nitrogen ratio sewage decontamination effect improving.Denitrification refers to that, under the condition of anaerobic or hypoxemia, denitrifying bacterium is by nitrate nitrogen (NO
3 --N) and nitrite nitrogen (NO
2 --N) be reduced into gaseous nitrogen (N
2or N
2o) journey, most of denitrifying bacterium is heterotrophic bacterium, they carry out anaerobic respiration, thereby in low carbon-nitrogen ratio sewage, the amount of carbon source are the determinatives that affects denitrification denitrogenation effect taking organism as carbon source with the energy.One or more natural solid slowly-releasing carbon sources in the utility model in preferred rice husk, corn cob and ageing rice, described slowly-releasing carbon source is released carbon rate stabilization, and raw material is extensive, cheap and easy to get.The dosage of slowly-releasing carbon source need to decide according to the concentration of nitrate from waste water nitrogen, nitrite nitrogen and DO, and specific formula for calculation is as follows:
In formula:
for the organism amount of needs, mg/L; [NO
3 --N] be the concentration of nitric nitrogen in sewage, mg/L; [NO
2 --N] be the concentration of Nitrite In Polluted Water nitric nitrogen, mg/L; DO is the concentration of dirty oxygen in water, mg/L.
The cycle that adds of slowly-releasing carbon source is to decide according to the carbon speed of releasing of slowly-releasing carbon source self, it is 20-40 days that the slowly-releasing carbon source that rice husk, corn cob and the ageing rice of selecting in the utility model combines adds the cycle, and slowly-releasing carbon source makes to be reduced to 0.4mg/L left and right into the concentration of the dissolved oxygen in water by 5.0mg/L.
In denitrification pond, the height of packing layer is the another one factor that affects low carbon-nitrogen ratio sewage decontamination effect improving.Under normal circumstances, bed stuffing height is larger, and the water environment capacity of system is stronger, and hydraulic detention time is also longer, and effluent quality will be better; But packing layer is thicker, investment cost is also just higher.Investigator of the present utility model, according to the infiltration coefficient of the hydraulic surface loading of system, filler and denitrifying action time, determines 0.8-1.4m by the thickness of packing layer.
In denitrification pond, the selection of the particle diameter of packing layer filler is the key factor that affects system stable operation.In the process of system stable operation, denitrifying bacteria can adhere to and form one deck microbial film at filling surface, if the particle diameter of filler is too small, the microbial film adhering to can reduce the hole of filler, cause under the sewage that floods layer and ooze difficulty, system water outlet reduces, and the gas that denitrification process produces simultaneously is also difficult to permeate filtrate and discharges the water surface; But packing material size is excessive, for the specific surface area of attached growth of microorganisms can reduce, infiltration coefficient can raise greatly, and hydraulic detention time reduces, and sewage can not get effective processing.Investigator of the present utility model determines that according to previous experiments running condition the particle diameter of packing layer filler is 2-5mm, and the residence time in denitrification pond is 2-4h.
Embodiment
Denitrification filtration system provided by the utility model is applied in the advanced treatment of Shenzhen's sewage treatment plant tail water, Sewage Plant water inlet is sanitary sewage, and comprise equalizing tank, intake pump, denitrification pond and water collecting basin denitrification filtration system that sewage disposal plant effluent enters as shown in Figure 1 carry out advanced treatment.
System influent quality situation is: COD
crfor 20-40mg/L, TN is 15-30mg/L, and SS is 2-10mg/L, and pH value is 6.8-7.5, water temperature 15-25 DEG C.
Equalizing tank utilizes the clean water basin of sewage work to form, and adopts brick mix structure, and underground type, is of a size of long 3m, wide 3m, and dark 2.5m, useful volume is 20m
3.The feed-water end of lift pump is arranged in equalizing tank, and water side connects the water-distributing device in denitrification pond.
Denitrification pond is brick mix structure, and semi-underground type is of a size of long 2m, wide 2m, and dark 2.2m, useful volume is 8m
3; The Chi Ding in denitrification pond is provided with water inlet, and water inlet connects water-distributing device, and water-distributing device as shown in Figure 2, is made up of in several water distribution branch pipes at packing layer top with parallel being equally spaced water distribution supervisor, and that water distributing pore is evenly set is several for oblique upper 60 ° of each water distribution branch pipe;
In pond, denitrification pond, be disposed with waterflooding layer, slowly-releasing carbon source layer, packing layer and supporting layer from top to bottom, the height of waterflooding layer is 0.3m, and the height of slowly-releasing carbon source layer is 3mm, and the height of packing layer is 1.2m, and the height of supporting layer is 0.3m; In slowly-releasing carbon source layer, fill ageing rice, it is the thick river of 2-4mm sand that packing layer is filled with particle diameter, and it is 20-50mm gravel that supporting layer is filled with particle diameter; Anti seepage membrane thickness is 2mm, and the hydraulic surface loading in denitrification pond is 3m
3/ m
2d.
Water collecting basin is the mixed underground type structure of brick, and its water outlet is connected with sewage work final outflow water discharge tube.
System effluent quality situation is: COD
crfor 10-50mg/L, TN is 2-8mg/L, and SS is 0-5mg/L, and pH value is 6.8-7.5, water temperature 15-25 DEG C.
Compared with prior art, the utility model has advantages of:
1. the denitrification filtration system in the utility model, using microorganism as main body, arranges supporting layer in denitrification device, packing layer, and slowly-releasing carbon source layer and waterflooding layer, form the required condition of anti-nitration reaction jointly;
2. the denitrification filtration system in the utility model adds solid slow-release carbon source, for denitrification process provides the carbon source material of sustainable use, can greatly reduce the DO concentration in water inlet;
3. the denitrification filtration system residence time in the utility model is 2-4h, has ensured the within a short period of time of the NO in decontaminated water treatment plant water outlet effectively
3 -the material such as-N, TN, saves system floor space.
Should be understood that; application of the present utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or convert, all these improvement and conversion all should belong to the protection domain of the utility model claims.
Claims (9)
1. for the treatment of a denitrification filtration system for low carbon-nitrogen ratio sewage, it is characterized in that, described denitrification filtration system is operation continuously in a day 24 hours, and whole system comprises equalizing tank, lift pump, denitrification pond and water collecting basin;
Described lift pump is arranged between described equalizing tank and denitrification pond, is provided with feed-water end and water side on described lift pump, and the feed-water end of described lift pump is connected with described equalizing tank by pipeline, and the water side of described lift pump is connected with described denitrification pond; Described denitrification pond is connected by pipeline with water collecting basin;
In described denitrification pond, be disposed with waterflooding layer, slowly-releasing carbon source layer, packing layer, anti seepage membrane and supporting layer from top to bottom.
2. the denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage according to claim 1, is characterized in that, the slowly-releasing carbon source layer top layer in described denitrification pond is provided with water-distributing device, at the bottom of the pond in described denitrification pond, is provided with captation; Described water-distributing device is connected with the water side of described lift pump by pipeline; Described captation is connected by pipeline with described water collecting basin.
3. the denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage according to claim 1, is characterized in that, the height of described waterflooding layer is 0.3-0.4m; The height of described slowly-releasing carbon source layer is 2-5mm; The height of described packing layer is 0.8-1.4m; The height of described supporting layer is 0.3-0.5m.
4. the denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage according to claim 3, is characterized in that, is filled with thick river sand in described packing layer, and the particle diameter of described thick river sand is 2-4mm, and the permeability coefficient of described thick river sand is 5-10 × 10
-5m/s; In described supporting layer, be filled with gravel, the particle diameter of gravel is 20-50mm.
5. the denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage according to claim 4, is characterized in that, the filling surface in described packing layer adheres to carbon source for utilizing slowly-releasing carbon source layer carries out the microbial film of denitrification denitrogenation.
6. the denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage according to claim 2, it is characterized in that, water-distributing device in described denitrification pond is made up of in several water distribution branch pipes on slowly-releasing carbon source layer top layer with parallel being equally spaced water distribution supervisor, and each water distribution branch pipe is evenly provided with several water distributing pores; Described captation is made up of in several headers of supporting layer bottom with parallel being equally spaced the supervisor that catchments, and each arm pipe bottom of catchmenting evenly arranges several gully-holes.
7. the denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage according to claim 1, is characterized in that, described anti seepage membrane is HDPE anti seepage membrane, and the thickness of HDPE anti seepage membrane is 0.5-2.5mm.
8. the denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage according to claim 2, is characterized in that, described water collecting basin is provided with water-in and water outlet, and described water-in is connected by pipeline with the captation in described denitrification pond; The water outlet of described water collecting basin is connected with the discharge outlet of sewage by pipeline.
9. the denitrification filtration system for the treatment of low carbon-nitrogen ratio sewage according to claim 2, is characterized in that, the water-in of described water collecting basin is arranged on the lower end of water collecting basin, and the water outlet of described water collecting basin is arranged on the upper end of water collecting basin.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060615A (en) * | 2015-07-17 | 2015-11-18 | 中国环境科学研究院 | Artificial wetland system for bypass restoration of polluted rivers |
| WO2021253409A1 (en) * | 2020-06-19 | 2021-12-23 | 中清信益环境(南京)有限公司 | Efficient denitrification filtering pool system and operating method |
-
2013
- 2013-11-26 CN CN201320753830.2U patent/CN203976470U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105060615A (en) * | 2015-07-17 | 2015-11-18 | 中国环境科学研究院 | Artificial wetland system for bypass restoration of polluted rivers |
| WO2021253409A1 (en) * | 2020-06-19 | 2021-12-23 | 中清信益环境(南京)有限公司 | Efficient denitrification filtering pool system and operating method |
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