The integration denitrification and dephosphorization system of rural sewage treatment
Technical field
This utility model is related to a kind of integration denitrification and dephosphorization system being applied to rural sewage treatment.
Background technology
With the increasingly quickening of China's Development of China's Urbanization, the living standards of the people of rural area improve constantly, water consumption by
Year improves, and increased the discharge capacity of country sewage simultaneously.Without corresponding sewage disposal system to this kind of sewage at
Reason, the nutrient substance such as substantial amounts of nitrogen, phosphorus, pesticide and other Organic substances are directly discharged in field ditch, river and lake, it will make water
Algae in body obtains abundant nutrition and sharp increase, and serious meeting makes water hypoxia, water quality deterioration, black smelly phenomenon,
This produces very big harm to ecological environmental and human health impacts.Therefore, supporting rural sewage treatment system construction seems particularly
Important, it is also the committed step that prevention natural water pollutes, prevents black smelly phenomenon generation simultaneously.
At present, the process of country sewage, because being restricted by factors such as geographical position it is difficult to be incorporated to urban pipe network, needs on the spot
Process, also will take rural holding area simultaneously less, therefore, compact conformation, operation convenience, floor space are little, effluent quality is high
Sewage disposal system urgently develop, this will have good practical significance to rural sewage treatment.
Utility model content
For overcoming drawbacks described above, the purpose of this utility model is to propose a kind of little, easy to maintenance the fitting of floor space
Integration denitrification and dephosphorization system for rural sewage treatment.
For reaching above-mentioned purpose, the integration denitrification and dephosphorization system of rural sewage treatment of the present utility model, described is
Following each unit that system is separated and be sequentially connected by water proof barricade form: pretreatment tank, anaerobic pond, anoxic pond, Aerobic Pond and heavy
Shallow lake groove;Connected by overflow mechanism between each unit;Each unit is wholely set, and described system shell adopts steel plate or cement plate
Material makes.
Preferably, being provided with internal reflux system between anaerobic pond and anoxic pond;
It is provided with nitrification liquid return-flow system between anoxic pond and Aerobic Pond;
It is provided with sludge recirculation system, in order to the activated sludge of sedimentation tank is passed through sludge reflux between anoxic pond and stillpot
System flowback is to anoxic pond.
Preferably, in pretreatment tank installing submersible pump, for a part of sewage separation is entered into anoxic pond.
Preferably, install in stillpot scraping mud equipment, it is provided with heavy bucket in described stillpot;Described scrapes mud
Equipment scrapes activated sludge in heavy bucket.
Preferably, being respectively mounted one or several mechanical stirring devices in pretreatment tank, anoxic pond.
Preferably, installing semi soft packing in described anaerobic pond, packing volume accounts for the 50%-70% of pond appearance, with propping up
Frame supports;At anaerobic pond bottom, one or more jet mixers are installed simultaneously.
Preferably, being provided with portable suspending carrier in described Aerobic Pond;Described portable suspending carrier accounts for pond
The 20%-30% holding, carrier proportion is 0.97-0.98kg/m3, more than 90%, specific surface area is more than 500m to porosity2/m3;
Aerator is installed in Aerobic Pond.
This utility model process is simple, is only provided with pretreatment tank, anaerobic pond, anoxic pond, Aerobic Pond and stillpot, and point
Do not install in anaerobic pond and Aerobic Pond, added semi-soft packing and portable suspending carrier, by biomembrane and activated sludge two
Plant technique to be organically combined together.This system, by the way of distributing inlet, makes limited carbon source in rural sewage obtain
Make full use of, not only increase the anti-load-bearing capacity of system and the denitrification dephosphorization ability of system, and processing low-carbon-source agriculture
During industry sewage, need not add or add less carbon source and can obtain higher denitrogenation dephosphorizing efficiency, ammonia nitrogen removal frank reaches 98%, always
More than 95%, total tp removal rate reaches 95% to nitrogen removal efficiency.
Brief description
Fig. 1 is the structural representation of this utility model embodiment.
Specific embodiment
Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, illustrated embodiment is served only for explaining this reality
With new, but this utility model is not limited to embodiment.Methods described is conventional method if no special instructions.Described former
Material all can be either commercially available from open if no special instructions.
Fig. 1 is the structural representation of this utility model embodiment.As shown in figure 1, a kind of integration of rural sewage treatment
Denitrification dephosphorization system, including pretreatment tank 1, anaerobic pond 2, anoxic pond 3, Aerobic Pond 4, stillpot 5, this system can be applicable to low-carbon (LC)
The rural sewage treatment in source, also apply be applicable to small town sewage disposal, Expressway Service, tourist attraction, nursing house with
And the sewage disposal such as army post.
It is mounted with mechanical stirring device 6 and Water inlet shunt device 7, wherein mechanical stirring device can make entrance in pretreatment tank
The sewage of system uniformly mixes;Part flow arrangement is to the part water inlet in pretreatment tank is further separated into anoxic pond, being
Denitrification dephosphorization effect in anoxic pond provides more carbon sources.Therein overflowing then is passed through in another part water inlet in pretreatment tank
Certainly flowing into anaerobic pond carries out anaerobic phosphorus release effect on stream weir.
Anaerobic pond has added semi-soft fiberfill 9 has been made by polypropylene or polyethylene, diameter can for ф 120mm,
ф 150mm or ф 200mm, installing space, between 30-100mm, specifically can adjust peace according to required packed density during design
Dress spacing;Specific surface area is in 25-110m2/m3.Packing layer accounts for the 50%-70% of total pond appearance it is therefore intended that extending sludge age, enriches micro-
Biological species, improve anti-load-bearing capacity.In at the bottom of pond, jet mixing device 8 is installed, not only can prevent activated sludge from depositing, and
Activated sludge and sewage uniformly can be mixed, so that activated sludge is fully contacted with the pollutant in sewage, improve to pollutant
Removal ability.Sewage after processing through anaerobic pond, flows into anoxic pond certainly through downflow weir.
Using the mechanical stirring device in anoxic pond, activated sludge is uniformly mixed with sewage, make activated sludge and sewage
In pollutant be fully contacted, carry out denitrification dephosphorization reaction, on the one hand can utilize denitrifying phosphorus removing bacteria (dpaos) effect
Absorb the phosphorus in sewage, on the other hand can reduce the content of Nitrite In Polluted Water nitrate nitrogen and nitrate nitrogen, in internal reflux system
In the presence of, by the mixed-liquor return of the activated sludge in anoxic pond and sewage to anaerobic pond, make denitrifying phosphorus removing bacteria in anaerobism
Under the alternating action of anaerobic environment, realize denitrification dephosphorization function, nitrite nitrogen and nitrate nitrogen can also be reduced simultaneously
Inhibitory action to anaerobic phosphorus release reaction.Sewage after processing through anoxic pond, flows into Aerobic Pond certainly through downflow weir.
Add portable suspending carrier 10 according to the 20%-30% that pond holds in Aerobic Pond, this carrier is cylindrical, diameter
For 10mm or 20mm, it is made up of polyethylene, proportion is 0.97-0.98kg/m3, more than 90%, specific surface area is more than porosity
500m2/m3It is therefore intended that the nitrobacteria making the generation cycle longer is attached on suspending carrier, extend the sludge age of system, carry
The nitrification efficiency of high system.
Aerator 11 is installed in Aerobic Pond, provides sufficient oxygen for aerobic reaction.Additionally, arranging in Aerobic Pond
Nitrification liquid return-flow system, nitrite nitrogen produced by nitrifying process and nitrate nitrogen are back to anoxic pond, are that denitrification removes
Phosphorus effect provides more electron acceptors, and meanwhile, the polyP bacteria in activated sludge also can absorb in sewage under aerobic condition
Phosphorus, realizes dephosphorization function.Sewage after processing through Aerobic Pond, flows into stillpot 5 certainly through downflow weir.
Install in stillpot 5 and scrape mud equipment 12, be provided with heavy bucket in described stillpot;Described scrapes mud equipment
Activated sludge is scraped in heavy bucket.In stillpot, using action of gravity, muddy water is carried out separating, supernatant is through outlet conduit
Enter water body, the activated sludge part precipitating provides through sludge recirculation system, the operation being back to anoxic pond for system
More Biomass are it is ensured that being smoothed out of denitrification dephosphorization effect, another part activated sludge then waste disposal.
Using integration denitrification and dephosphorization system described in the utility model, country sewage is processed, result is listed in table
In 1.In water outlet, cod, ammonia nitrogen, total nitrogen, total phosphorus all can reach the People's Republic of China's " urban wastewater treatment firm pollutant emission mark
Accurate " (gb18918-2002) one-level a standard.
The disposition to country sewage for the table 1 integration denitrification and dephosphorization system
The foregoing is only preferred embodiment of the present utility model, be not limited to this utility model, for this
For the technical staff in field, this utility model can have various modifications and variations.All of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvement made etc., should be included within protection domain of the present utility model.