Embodiment
Below in conjunction with embodiment, the utility model is described in further detail.Should be appreciated that specific embodiment described herein, only for explaining the utility model, and be not used in restriction the utility model.
At first the utility model provides a kind of less energy-consumption for the Sewage treatment systems upgrading, the ecological internal recycle nitrifying method of smart three-dimensional, that the contact-oxidation pool of sewage disposal is transformed into to settling tank, and the roof solar device is set above this settling tank, periphery arranges aerogenerator, to generate electricity to whole operation of sewage disposal system, at least one stereo ecological internal recycle processing unit is set in described settling tank pond, each stereo ecological internal recycle processing unit can be embarked on journey according to the application place, in column or be array format, each described stereo ecological internal recycle processing unit is respectively arranged with deodorizing district and circulation nitration reaction district from top to bottom, the nitration reaction that wherein circulates district is arranged at a circulation and holds concurrently in the oxygen case, from-inner-to-outer is divided into aerobic zone and double oxygen negative area, at aerobic zone, aeration element is set simultaneously, and the flow when introducing controller and controlling the sewage disposal in pond, the content of dissolved oxygen, temperature in pond and sludge concentration.When sewage is introduced described aerobic zone by water inlet pipe 21, castering action by aeration element makes sewage be driven and be risen by aerobic zone (rising area), flow through to while approaching water surface 50-500mm, fluidized active sludge and liquid can flow to the oxygen negative area (decline district) of holding concurrently by the unlimited water outlet through being arranged on aerobic zone top, owing to after aerobic zone (rising area) aeration, containing bubble, the density ratio oxygen negative area (decline district) of holding concurrently is low, thereby can produce the density difference of rising area and last transition, make the place that between 2nd district, liquid is high from density flow to low density place, make hold concurrently oxygen negative area (decline district) interior active sludge and downward liquid flow, enter again aerobic zone (rising area) from the internal recycle water inlet of aerobic zone setting, at this moment, the active sludge and the liquid that enter aerobic zone rise by the effect of aeration element again, make active sludge and liquid in rising area again the unlimited water outlet by aerobic zone top reenter the double oxygen negative area (decline district) that circulation is held concurrently in the oxygen case, start next circulation, complete the sewerage ecological nitrifying process, supernatant liquor by the nitration reaction that repeatedly circulates, finally by the water outlet on described settling tank, flowed out.Like this, by absorbing sun power and the wind-force that utilizes nature, for whole operation of sewage disposal system provides the energy, make it not need external source, and aboundresources, both can freely use, again without transportation, to environment without any pollution, simultaneously, flow while by control device, controlling the sewage disposal in pond, the content of dissolved oxygen, temperature in pond and sludge concentration, at foul smell that constantly flow process produces, filler and the plant roots and stems by the deodorizing district fully adsorbs and decomposes the sewage that makes to be arranged in aerobic zone and double oxygen negative area, simultaneously on constantly, in lower reaching, in the outer circulation process at the abundant oxygen supply of aerobic zone and proper temperature, under nutritional condition, make to be invested in aerobic microorganism amount reproduction in this zone, cultivate nitrobacteria, cultivate Denitrifying Phosphate Accumulating Organisms in double oxygen negative area, and utilize it that oxidation operation in sewage is decomposed, thus in the past, constantly make sewage enter its internal recycle, and then can complete the less energy-consumption of sewage disposal, the intelligent anaerobic phosphorus release of controlling, the technological process of aerobic nitrification and double oxygen denitrification phosphorus-collecting.
In said apparatus, the volumetric ratio of described aerobic zone and double oxygen negative area is chosen 1-2.5:0.4-1; When domestic sewage processing system is applied, its new construction index is: the project occupation of land area is 0.3-0.4m
2/ m
3, its operating parameter is: the aerobic zone reaction times is 4-6h; Mixed liquor suspended solid, MLSS concentration (MLSS) is controlled at 2500-7000mg/L; Aerobic zone dissolved oxygen (DO) is got 2-5mg/L, and the oxygen negative area dissolved oxygen (DO) of holding concurrently is got 0.3-1.0mg/L, and the pH value is 7-7.8.
Referring to Fig. 1-Fig. 3, the less energy-consumption of a kind of newly-built municipal wastewater treatment plant that the utility model provides and municipal wastewater treatment plant treatment system upgrading, the nitrated device of the ecological internal recycle of smart three-dimensional, it comprises that the contact-oxidation pool in the processing of raw waste water treatment system is transformed into settling tank 2, and roof solar power generation assembly 50 is set above this settling tank 2, device of solar generating 50 comprises a plurality of sun power electroplaxs 501, these settling tank 2 peripheries, aerogenerator 60 also is set, device of solar generating 50 also is connected a secondary battery 70 by circuit control device 80 with aerogenerator 60, the direct current that can make device of solar generating 50 and aerogenerator 60 produce converts to and meets the alternating-current that electrical network requires through circuit control device 80, and by secondary battery 70, the electrical power storage of when illumination is arranged, sun power electroplax 501 being sent, it's time to needs to discharge again, device of solar generating 50, aerogenerator 60, circuit control device 80 and secondary battery 70, all by master controller 90, control, be provided with at least one internal recycle processing unit 1 in this settling tank 2, the interior transverse row of settling tank 2 shown in Fig. 3, Fig. 4 is shown 4 internal recycle processing units 1, can realize that settlement of sewage and supernatant liquor horizontal direction flow out at settling tank 2, settling tank 2 is provided with water outlet 22.Referring to Fig. 2, Fig. 4, Fig. 9, each described processing unit 1 is respectively arranged with deodorizing district A and circulating reaction district from top to bottom, and wherein the circulating reaction district is arranged at a circulation and holds concurrently in oxygen case 104, and circulation is held concurrently oxygen case 104 in the interior transversely arranged layout of settling tank 2.Described deodorizing district A is positioned at circulation oxygen case 104 tops of holding concurrently, and plants and has water to support plant 4, and water is supported plant 4 and supported stems and be positioned at deodorizing district A, and the branches and leaves 41 on its top are revealed in above the interior sewage of settling tank 2, and the root 42 under it is placed in the hold concurrently inside of oxygen case 104 of described circulation; Described circulating reaction is divided into the B(decline district, oxygen negative area of holding concurrently) and aerobic zone C(rising area), wherein aerobic zone C is positioned at the double oxygen case of circulation 104 zones, central zone, the described circulation oxygen case 104 of holding concurrently is provided with the internal recycle water inlet 112 that can be communicated with the interior sewage of settling tank 2, and bottom is provided with mud thrust-augmenting nozzle 105; In described aerobic zone C, be provided with internal recycle water inlet 112, with water inlet pipe 21, be communicated with, aerobic zone C also is provided with aeration element 108, this aeration element 108 is located at aerobic zone C bottom, can be by aeration element 108 oxygenations of aeration tube 3 for arranging in each aerobic zone C that are arranged at settling tank 2 bottoms, aeration tube 3 connects gas blower 400, for aeration element 108 provides oxygen.In said apparatus, each internal recycle processing unit is cultivated nitrobacteria and denitrifying bacterium in different zones, and by aeration power, by aerobic zone C(rising area) in fluidized active sludge and liquid drive rising at aerobic zone C, flow through to while approaching water surface 50-500mm, sewage disposal liquid 117 flows to around the B(decline district, double oxygen negative area beyond aerobic zone C periphery through the unlimited water outlet on aerobic zone C top) in, due to aerobic zone, C contains bubble, density ratio is held concurrently, and B is low in the oxygen negative area, form the density difference in two intervals, therefore, sewage disposal liquid 117 just descends at this double oxygen negative area B froth breaking and muddy water mixed solution, be down to while holding concurrently oxygen negative area B bottom section, the effect of entrainmenting due to aerobic zone C aeration element 108, and B is low in the oxygen negative area because aerobic zone C density ratio is held concurrently, sewage disposal liquid 117 is inhaled in aerobic zone C again by internal recycle water inlet 112, circulation again.Like this, sewage disposal liquid 117 constantly from inside to outside and from top to bottom circulates at regional, makes muddy water mixed solution realize endless backflow, removes organic pollutant thereby reach, the purpose of denitrogenation.The utility model is under continuous running status, the Gradient distribution that aerobic zone C that can be in oxygen case 104 is held concurrently in circulation and double oxygen negative area B realize dissolved oxygen, the sewage of each unit after the internal recycle nitration treatment is in the interior precipitation of settling tank 2, finally the supernatant liquor 106 by the nitration reaction that repeatedly circulates flows out by settling tank water outlet 22, the mud 109 precipitated in double oxygen negative area B is discharged by the mud thrust-augmenting nozzle 105 of the double oxygen case of circulation 104 bottoms, and imports to anoxic pond or sludge thickener (seeing Figure 10, Figure 11) by mud suction pump 300.In above-mentioned working cycle, sewage is imported in settling tank 2 by water inlet pipe 21 by intake pump 200, and its flow is controlled by flow director 91; Control aeration element 108 aeration rates by dissolved oxygen controller 92, to control the content of dissolved oxygen in sewage disposal liquid 117, the temperature of the interior sewage disposal liquid 117 of settling tank 2 is controlled by temperature regulator 93, mud 109 concentration of discharging that precipitate are controlled by consistency controller 94, form the intelligent control process of whole system.
It should be noted that, after above-mentioned circulation, supernatant liquor 106 also can, under the control of master controller 90, by recycle pump 100, be reintroduced back in settling tank 2, again carry out short distance nitration, denitrification process, thoroughly to guarantee the up to standard of the indexs such as deodorizing dephosphorization denitrogenation and total nitrogen.
Below in conjunction with accompanying drawing, the nitrated unit of the ecological internal recycle of the utility model neutral body 1 concrete structure is further described.
Embodiment mono-:
Referring to Fig. 4, as nitrated unit embodiment mono-structure of the utility model stereo ecological internal recycle, hold concurrently oxygen case 104 of described circulation suspends and is arranged in settling tank 2, and top is provided with rectangle plant basket 116, and described water is supported 4 kinds of plants and planted in this plant basket 116.Specifically referring to Fig. 5-Fig. 8, plant basket 116 is fixing by plant basket support 115, two ends are provided with plant basket handle 1161, and 115 4 angles of plant basket support are respectively equipped with unit connection draw-in groove 101, can processing unit in each be connected in one in contact-oxidation pool 2 by web member, plant basket support 115 is fixed on a suspension device 114, this suspension device 114 is, in plant basket support 115 bottoms, the element that can suspend in water is set, by pressing plate 1141 and fastening piece 1142, make it lock ring in the periphery of the double oxygen case of circulation 104 upper ends, both can be used for supporting plant basket support 115, plant basket 116 and the foster plant 4 of water of planting in this plant basket 116 are suspended on settling tank 2 waters surface, can make again the whole circulation oxygen case 104 of holding concurrently be suspended in settling tank 2 water.
Particularly, described water is supported plant 4 and can be selected the emergent that rhizome is flourishing, have dephosphorization and denitrification effect.Plant Net Photosynthetic Rate and dissolved oxygen distribution, total nitrogen and ammonia nitrogen removal frank marked positive correlation, and plant transpiration speed and ammonia nitrogen removal frank significant correlation.Suitably increase plant growing density and be conducive to improve the denitrification effect in sewage treatment process, but plant overstocked unfavorable on the contrary to improving dissolved oxygen levels and nitrogen removal rate.Significantly, employing is not gathered in plant and can be made terrestrial stem neither destroy roots of plants district microenvironment for plant-growth cycle and denitrogenation impact.The type of plant also has a great impact the effect of denitrogenation dephosphorizing.The research discovery, in the stereo ecological device matrix of plantation raupo and Rush, nitrogen, phosphorus are respectively than low by 18%~28% and 20%~31% in the contrast matrix of nothing plant, and visible raupo and Rush have absorbed nitrogen and the phosphorus of part in sewage.Decontamination effect improving by control experiment the utility model to sewage nitrogen, found that it is 77.7%, 71.2% and 66.4% that Rhizome of Grass leaf Sweelflag, Rush and 3 of Herba Iridis japonicae have the total nitrogen average removal rate of botanical system, and be only 55.8% without the clearance of botanical system.To the decontamination effect improving of sewage phosphorus, found that 3 have the clearance of botanical system to be respectively 61%, 65% and 59%, and be only 28% without the clearance of botanical system.By having studied the ability of 8 kinds of aquatic plant purification sewage, found that: the good and bad order of effect that the waterplant in summer that temperature is high is removed nitrogen is: water hyacinth, water lettuce, frogbit, duckweed, Chinese scholartree leaf duckweed, duckweed, water sieve; At temperature, be followed successively by frogbit, Herba Eichhorniae, duckweed, water lettuce, duckweed, Chinese scholartree leaf duckweed, water sieve low winter.
The emergent of planting in the utility model has and is adapted at the Structure and characteristics of surviving under aerobic or few oxygen condition, comprises the stem hypertrophy, and stem He Gen center has larger tissue, stem hollow, the dark root system of tool etc.This special construction of plant, be conducive to the transmission of oxygen in its body and can be delivered to the root district, not only met the respiration of plant in anaerobic environment, but also can promote the redox reaction in root district and the activity of aerobic microbiological, discharged uncontaminated air and remove peculiar smell.The oxygen produced under photosynthesis is delivered to the root district, form the microenvironment of oxidation in the medium of the reduction-state in Gen district, aerobic zone, root district provides microhabitat separately with aerobic, the double oxygen and the anaerobion that jointly exist for the root district of anoxic zones, makes different microorganisms can bring into play effect separately.Oxygen depends primarily on the concentration of inside plants oxygen, the oxygen requirement of matrix and the perviousness of plant endwall on every side in the release of plant root.Plant discharges oxygen by absorption at root is to be determined by itself structure, and the structure of plant has stoped its leakage radially, and makes great efforts to make the loss that is discharged into the oxygen in root district to reduce to minimum.The release rate of the oxygen generally inferior apex zone at root is the highest, and reduces with the increase of the distance tip of a root.Waterplant has convection ventilating tissue, Qi Gen district and root all have the concentration of higher inside oxygen, but flowing of the gas of this convection obviously increased the length of oxygen supply root, can also reduce some potential objectionable impuritiess of root by oxidation and detoxification simultaneously.Except root system can discharge oxygen, root system can also discharge other material.So more than 100 kind of emergents such as described emergent is preferably Arundo donax, Alocasia ordora, fragrant Alocasia ordora, common calla, Canna generalis Bailey, Monstera deliciosa, He Wanglan, schefflera, nasturtium, Rhizome of Common Aspidistra, the thorn that comes into leaves certain herbaceous plants with big flowers, climbing fig, jade hairpin, marsh nutgrass flatsedge, Rhizoma Acori Calamis, above-mentioned plant harvesting and arrangement are very easy to.
Understandably, the foster plant 4 of above-mentioned water can also be the foster flowers of water or vegetables.The utility model of being located at community can cultivate flowers in deodorizing district A, and the foul smell ,Gei community in the time of both can absorbing sewage disposal provides pure and fresh flower fragrance, and the Hai Kedui community is beautified simultaneously, is to kill two birds with one stone.Deodorizing district A cultivation vegetables, the utility model that is arranged at Sewage treatment systems can be become to the plantation base of vegetables, can reach multiple effect equally.
In described plant basket 116, be provided with and can be used for supporting the deodorizing filler 102 that water is supported the rhizome of plant 4 and adsorbable, degrading microorganism, absorption foul smell.Further, supporting described water, to support the deodorizing filler 102 of plant 4 rhizomes be gac, haydite or photocatalyst new composite carbon material.Certainly, can be also other fillers.The utility model preferred light catalyst new composite carbon material.Described photocatalyst new composite carbon material has three kinds of red-brown, white and black, is to be formed by compound firing such as charcoal, potter's clay, photocatalyst agent and high temperature cakingagents.Can be as required in production realistic existing size, microporosity and how little water-intake rate is is adjusted, the aperture of finished product is between the 0.06-6 micron, and weight can be adjusted to 0.6-2.7g/cm
3between, specific surface area can reach 1.2 * 104cm2/g left and right.In building-up process, make its hole wall glassy phase and crystal interweave and grow into the triplen of high-strength mechanical performance, internal capillary is prosperity and distribution gradient very, has the ability of good adsorption and desorption.With traditional gac, compare, photocatalyst new composite carbon material has improved adsorption fouling particulate matter kind greatly, improved adsorption efficiency and saturated capacity, its adsorption efficiency be common gac 2-4 doubly, and overcome and use gac can produce the shortcoming of powder and black pollution.In environmental applications, because of the high-rate fitration material that it has strong adsorptive power and resistance to erosion, resistance to wears, the characteristic such as high temperature resistant, corrosion-resistant can replace gac and haydite to purify as empty G&W; Because of its have ultralight body weight suspension and resistance to erosion, resistance to wear, the characteristic such as high temperature resistant, corrosion-resistant can replace conventional filler.While being used as the high speed filtrate of industrial waste gas purifying, because the specific surface area of photocatalyst new composite carbon material reaches 1.2 * 104cm2/g left and right, and internal run-through micropore distribution gradient, material is ultralight, the physics and chemistry stable in properties, the acid-fast alkali-proof superior performance, and move and be adsorbed because intergranular Van der Waals force, Coulomb's force and surface tension make suspended substance or waste gas, adsorptive power is extremely strong, speed is exceedingly fast, by the photocatalyst technology of proprietary ultraviolet source, can realize the function that decompose on absorption limit, limit.
The foster plant 4 of water be arranged in the oxygen negative area B that holds concurrently in the plant blue 116 on the blue support 115 of plant is suspended in the oxygen negative area B water surface of holding concurrently, the whole suspension growths of the ecological filler of its powerful rhizome System forming are in sewage, utilize the root system that waterplant is huge, the foul smell produced when in the 102 pairs of waste water of deodorizing filler that are arranged at support rhizome in plant blue 116 and deodorizing, microorganism and system are processed is adsorbed, degraded, on the other hand when foul smell upwards overflows, by waterplant, luxuriant branches and leaves form an adsorbable foul smell, prevent the sealing coat of foul smell to external diffusion, thereby the denitrogenation dephosphorizing deodorizing that realizes waste water is processed.
In the utility model embodiment, also the deodorizing filler 102 that supports rhizome can be placed in to plant indigo plant 116 as carrier---be similar to the soil of plant, making water support plant 4 root systems 42 is fixed in sewage, in reaction process, foul smell contacts with the microorganism on the deodorizing filler 102 that supports rhizome simultaneously, further adsorb and decompose odor, and powerful rhizome system is purified waste water by it.
Please again referring to Fig. 4, in nitrated unit 1 embodiment mono-of the utility model stereo ecological internal recycle, described circulation is held concurrently in oxygen case 104 and is provided with biologic packing material 110, fixing and in circulation oxygen case 104 central zones of holding concurrently by filler anchor 113, filler anchor 113 is connected with plant blue 116, and be suspended in the double Yang Xiang of circulation 104 centers, form described aerobic zone C.Biologic packing material 110 in aerobic zone C hollow tubular in the form of a ring arranges, as the aerobe carrier, being suspended in circulation and holding concurrently in oxygen case 104, and filler growth inside anerobe, producing denitrification can denitrogenation; Outside growth aerobic bacteria, can remove organism, has the nitrification and denitrification process in whole treating processes simultaneously.Described circulation oxygen case 104 tops of holding concurrently, and be positioned at the zone beyond aerobic zone C upper opening, thering are a plurality of vertically disposed diaphragms 111, each diaphragm 111 tops are fixed on the bottom of plant basket support 115, and lower end extends to double oxygen negative area B.In each diaphragm 111, the longest dividing plate and aeration element 108, in the same level position, also can be used as the installation component of filler anchor 113.The double oxygen case of circulation 104 bottoms are contraction-like, are convenient to 109 of mud and fall, and its bottom is provided with mud thrust-augmenting nozzle 105, and the mud 109 that precipitation falls can be discharged to anoxic pond or sludge thickener (seeing Figure 10, Figure 11) from this pipe.
The utility model embodiment mono-structure, in the settling tank 2 in Sewage treatment systems, the nitrated unit 1 of a plurality of stereo ecological internal recycle is suspended in pond, settling tank 2 in the raw waste water treatment system of take processing increases air lifts and rises stereo ecological internal recycle nitration treatment unit as main, and the plant purification organism is that auxiliary a kind of ecosystem is processed structure cheaply.In settling tank 2, because the water displacement that suspension device 114 can carry reaches 900 kilograms, therefore the circulation that can be 600 kilograms by total amount is held concurrently, the foster plant 4 of oxygen case 104, plant basket 116, deodorizing filler 102 and water is suspended in settling tank 2.Simultaneously, be arranged at aeration tube aeration in the aeration element 108 in aerobic zone C, fluidized sewage disposal liquid 117 in settling tank 2 is driven vertically and rises at aerobic zone C, flow through to while approaching water surface 50-500mm, because run into the outward opening transverse flow flowed to by aerobic zone C top that stops of deodorizing district A, enter the B(decline district, oxygen negative area of holding concurrently in the double oxygen case 104 of circulation) in.For further standard flows to, the double interior vertically disposed diaphragm of oxygen case 104 of circulation 111 lower ends extend to can be with aeration element 108 in the same level position while holding concurrently oxygen negative area B, constraint fluidized activated sewage treatment solution 117 forces to enter by diaphragm 111 the B(decline district, oxygen negative area of holding concurrently), due to aerobic zone C(rising area) contain bubble, the density ratio B(decline district, oxygen negative area of holding concurrently) low, produced the density difference of rising area and last transition, make liquid between 2nd district produce circulation, simultaneously bottom the aerobic zone C after aeration, due to the effect of entrainmenting that has aeration, the internal recycle water inlet 112 that the sewage disposal liquid 117 of the double oxygen negative area B that water conservancy diversion descends just arranges by aerobic zone C bottom again sucks, enter again aerobic zone C, oral area by its opened upper end after rising outwards enters the oxygen negative area B that holds concurrently again, therefore form the nitrifying process that circulates from inside to outside, finally the double oxygen negative area B supernatant liquor 106 by the nitration reaction that repeatedly circulates can flow to settling tank 2 from the water outlet that is positioned at diaphragm 111 outsides, supernatant liquor after settling tank 2 precipitations is flowed out by settling tank water outlet 22.The mud 109 that the oxygen negative area B that holds concurrently falls is discharged by the mud thrust-augmenting nozzle 105 of the double oxygen case of circulation 104 lower ends.The present embodiment is adapted to the Sewage treatment systems transformation of not stopping.
Embodiment bis-:
Referring to Fig. 9, the present embodiment and embodiment mono-are basic identical, and difference is, the described circulation oxygen case 104 of holding concurrently is fixedly installed in contact-oxidation pool 2, and top is provided with rectangle plant basket 116, and described water is supported 4 kinds of plants and planted in this plant basket 116.With embodiment mono-, plant basket 116 is fixing by plant basket support 115, two ends are provided with plant basket handle 1161, and 115 4 angles of plant basket support are respectively equipped with unit connection draw-in groove 101, can processing unit in each 1 be connected in one in settling tank pond 2 by web member, plant basket support 115 is connected and fixed by the double oxygen case 104 of back up pad 103 and circulation, and double 104, the oxygen case of circulation is fixed in settling tank 2 by support foot rest 107.With embodiment mono-, the present embodiment is in the settling tank 2 in Sewage treatment systems, the nitrated unit 1 of a plurality of stereo ecological internal recycle is fixed in pond, settling tank 2 in the raw waste water treatment system of take processing increases air lifts and rises stereo ecological internal recycle nitration treatment unit as main, and the plant purification organism is that auxiliary a kind of ecosystem is processed structure cheaply.In settling tank 2, be arranged at aeration element 108 aerations in aerobic zone C, fluidized sewage disposal liquid 117 in settling tank 2 is driven and rises at aerobic zone C, flow through to while approaching water surface 50mm, because run into the outward opening transverse flow flowed to by aerobic zone C top that stops of deodorizing district A, enter the B(decline district, oxygen negative area of holding concurrently in the double oxygen case 104 of circulation) in.The double interior vertically disposed diaphragm of oxygen case 104 of circulation 111 lower ends extend to can be with aeration element 108 in the same level position while holding concurrently oxygen negative area B, constraint fluidized activated sewage treatment solution 117 forces to enter by diaphragm 111 the B(decline district, oxygen negative area of holding concurrently), due to aerobic zone C(rising area) contain bubble, the density ratio B(decline district, oxygen negative area of holding concurrently) low, produced the density difference of rising area and last transition, therefore, produce circulation containing alveolate sewage its muddy water mixed solution liquid between 2nd district after the froth breaking of double oxygen negative area, simultaneously bottom the aerobic zone C after aeration, due to the effect of entrainmenting that has aeration, the internal recycle water inlet 112 that the sewage disposal liquid 117 of the double oxygen negative area B that water conservancy diversion descends just arranges by aerobic zone C bottom again sucks, enter again aerobic zone C, oral area by its opened upper end after rising outwards enters the oxygen negative area B that holds concurrently again, therefore form the nitrifying process that circulates from inside to outside, finally the double oxygen negative area B supernatant liquor 106 by the nitration reaction that repeatedly circulates can flow to settling tank 2 from the water outlet of diaphragm 111 outsides, after settling tank 2 precipitations, supernatant liquor is flowed out by settling tank water outlet 22.The mud 109 that the oxygen negative area B that holds concurrently falls is discharged to anoxic pond or sludge thickener (seeing Figure 10, Figure 11) by the mud thrust-augmenting nozzle 105 of the double oxygen case of circulation 104 lower ends.The present embodiment is adapted to the newly-built or transformation of stopping of Sewage treatment systems.
The utility model is applicable to the urban sewage treatment system upgrading, adopts foundation and the design of kinetic model and parameter in practical engineering application:
In the nitrated unit 1 of stereo ecological internal recycle, the biochemical kinetic model of double oxygen negative area B and the foundation of parameter can be according to operation and the operating method of lab scale process, determine the parameters such as speed of reaction, reaction times and reactor effective volume in the biochemical kinetics of periodical operation and operate continuously, for practical engineering application from now on provides reference frame.
1. the general requirement of the utility model application
(1) the utility model should be for small-sized town sewage and Industrial Wastewater Treatment engineering, and its single cover sewage load should be less than 150m3/d, when processing the water yield, is greater than 150m
3during/d, should adopt the circulate mode of nitrated device cooperation of many cover stereo ecologicals.
(2) water inlet of the present utility model should meet following condition:
1) water temperature is preferably that 10 ℃~37 ℃, pH are preferably 6.0~9.0, BOD
5/ COD
crvalue should be greater than 0.3, nutrient combination is than (BOD
5: nitrogen: phosphorus) be preferably 100:5:1, influent COD Cr concentration should be lower than 1000mg/L;
2) having while removing the ammonia nitrogen requirement, water inlet total alkalinity (in CaCO3)/ammonia nitrogen value is suitable >=and 7.14, should supplement basicity while not meeting;
While 3) removing the total nitrogen requirement, denitrification require the carbon source BOD5/ total nitrogen value of water inlet suitable>=4.0, total alkalinity is (with CaCO
3meter)/and the ammonia nitrogen value is suitable>=and 3.6, answer supplementary carbon source or basicity while not meeting;
While 4) the dephosphorization requirement being arranged, the five-day BOD (BOD in sewage
5the ratio of)/total phosphorus should be greater than 17:1;
While 5) requiring dephosphorization simultaneously, denitrogenation, should meet 3 simultaneously) and 4) requirement.
(3), when the utility model water outlet is directly discharged, should meet country or local emission standard requirement; While entering the next stage processing unit, should meet the water inlet requirement of next stage processing unit.
(4) according to the denitrogenation dephosphorizing requirement, should be in stereo ecological circulates nitration processes preposition anoxic pond.
(5), when influent quality does not meet (2) defined terms, should take suitable pre-treatment and pretreatment technology according to influent quality.
(6) soda acid medicament, carbon source medicament and dephosphorization medicament storage tankage should be by the dosage designs of the 4d~7d of theoretical chemical feeding quantity, and medicine system should not be less than 2, should adopt volume pump to add.
2., while applying the utility model, municipal sewage treatment should adopt flow process shown in Fig. 9, flow process shown in the appropriate to the occasion employing Figure 10 of Industrial Wastewater Treatment.
3. pre-treatment and pre-treatment (seeing Figure 10, Figure 11)
1) before water inlet system, grid should be set.Inlet pumping station and grid design should meet the relevant regulations of GB50014.
2) fluidized-bed process should arrange settling pit after grid, and the design of settling pit should meet the relevant regulations of GB50014.
3) during higher than 200mg/L, should before the nitrated device of circulation, preliminary sedimentation tank be set when water inlet suspended substance (SS), the design of preliminary sedimentation tank should meet the relevant regulations of GB50014.
4) when above, equalizing tank should be set when the daily variation maximum value of water quality or the water yield twice that is minimum value or twice.The design of equalizing tank should meet following requirement:
A) the equalizing tank capacity should be determined according to the wastewater flow change curve; While there is no flow changing curve, the residence time of equalizing tank is preferably 6h~12h;
B) in equalizing tank, whipping appts should be set, should adopt stirrer or aeration agitation mode;
C) the equalizing tank water side should arrange the device that scums, and at the bottom of pond, desanding and mud discharging device should be set.
5) pH regulator should meet the following requirements:
A) as water inlet pH<6.0 or pH > 9.0 the time, should supplement in time appropriate soda acid medicament;
B) medicament kind, dosage and add a little and should determine by test in place;
C) the soda acid medicament can adopt dilute hydrochloric acid, dilute sulphuric acid, lime or sodium carbonate etc.;
D) e-quipment and pipe of contact acid caustic corrosion material should be taked anticorrosive measure.
6) carbon source is regulated and should be met the following requirements:
A) as water-inlet carbon source BOD
5/ total nitrogen value<4.0 o'clock, should supplement proper amount of carbon source in time;
B) medicament kind, dosage and add a little and should determine by test in place;
C) the carbon source medicament can adopt the high concentrated organic wastewater of the discharges such as methyl alcohol, acetic acid or food brewery;
When d) storage and use methyl alcohol are as carbon source, should do corresponding gas defence protection;
E) e-quipment and pipe of contact acetic acid corrosives should be taked anticorrosive measure;
F) the carbon source dosage should be calculated as follows:
BOD
5=2.86×(N
1-N
0)×Q…………………………(1)
In formula:
BOD5---BOD5 amount corresponding to carbon source added, mg/L;
N1---in ammonia nitrogen situation up to standard, during supplementary carbon source, do not process the total nitrogen concentration of water outlet, mg/L;
The water outlet total nitrogen concentration of N0---standard-required, mg/L;
Q---sewage design discharge, m3/d.
4. design variable of the present utility model
(1) the aerobic reactor zone volume is determined
While 1) according to the volumetric loading of the nitrated device of circulation, determining the aerobic reactor zone volume, should be calculated as follows:
V
1=Q(S
o-S
E)/N
v…………………………(2)
In formula:
V1---the nitrated device aerobic reactor zone volume that circulates, m3;
Q---sewage design discharge, m3/d;
So---the nitrated device water inlet chemical oxygen demand (COD) that circulates, mg/L;
Se---the nitrated device water outlet chemical oxygen demand (COD) that circulates, mg/L;
Nv---volumetric loading, kgCOD/(m3d).
2) volumetric loading (Nv) should be according to test or the design parameter determination of similar sewage, as without other data the time, and can be with reference to following rule of thumb data:
A) as waste water BOD5/CODCr > 0.4 the time, the desirable 3kgCOD/(m3d of Nv)~5kgCOD/(m3d);
B) in waste water during 0.3<BOD5/CODCr<0.4, the desirable 1kgCOD/(m3d of Nv)~3kgCOD/(m3d);
C), in waste water during BOD5/CODCr<0.3, the value that should improve BOD5/CODCr by pre-treatment and pre-treatment make it be greater than 0.3.
While 3) according to hydraulic detention time θ, determining the aerobic reactor zone volume, should be calculated as follows:
V1=Q·θ……………………………………………(3)
In formula:
V1---the nitrated device aerobic reactor zone volume that circulates, m3;
Q---sewage design discharge, m3/d;
θ---hydraulic detention time, h.
4), for sanitary sewage, the desirable 4h~6h of θ in formula (3), for the desirable 5h~8h of trade effluent or look its biodegradability and determine.After obtaining V1, should check by formula (2).
(2) double oxygen negative area volume is determined
1) volumetric ratio of aerobic reactor zone and double oxygen negative area is designed to (1~2.5): 0.4~1.
2) hypoxia response district volume should be calculated as follows:
In formula:
V2---hypoxia response district volume, m3; V1---the nitrated device aerobic reactor zone volume that circulates, m3;
D1---the nitrated device area that circulates, m2; D2---hypoxia response district area, m2.
(3) stereo ecological the determining of oxygen-supplying amount of nitrated device that circulate
1) circulate nitrated device of stereo ecological adopts the blast aeration oxygen supply, and aerator should be located at over against the nitrated bottom of device of the circulation in up-flow district, should adopt uniform middle micro porous aeration head or perforated pipe aerating regulation.The sewage oxygen requirement should be calculated as follows:
O
2=0.001aQ(S
o-S
e)-cΔX
vss+b[0.001Q(N
k-N
ke)-0.12ΔX
vss]-0.62b[0.001Q(N
t-N
te-N
oe)-0.12ΔX
vss]……………(5)
In formula:
O2---sewage oxygen requirement, kgO2/d; Q---sewage design discharge, m3/d;
So---water inlet five-day BOD, mg/L; Se---water outlet five-day BOD, mg/L;
Δ Xvss---discharge the microbial biomass of system, kg/d; Nk---water inlet total Kjeldahl nitrogen concentration, mg/L;
Nke---water outlet total Kjeldahl nitrogen concentration, mg/L; Nt---water inlet total nitrogen concentration, mg/L;
Nte---water outlet total nitrogen concentration, mg/L; Noe---water outlet nitrate, mg/L;
The oxygen equivalent of a---carbon, with the five-day BOD timing, get 1.47 when carbonaceous material;
B---oxidation per kilogram ammonia nitrogen requisite oxygen amount (kgO2/kgN), get 4.57;
The oxygen equivalent of c---bacterial cell, get 1.42.
While 2) removing carbon based pollutants, the nitrated device sewage oxygen requirement that circulates should be got 0.7kgO2/kgBOD5~1.2kgO2/kgBOD5.
When 3) stereo ecological circulation nitration processes is selected blast aerator and equipment, should be according to different blast apparatuses, aerating apparatus, be arranged in the undersurface degree of depth, water temperature, in factors such as dirty water oxygen overall transfer characteristic, local sea level elevation and expection biological fluidized bed dissolved oxygen concentrations, the sewage oxygen requirement of calculating is scaled to sewage oxygen requirement under standard state.
4) the lower sewage oxygen requirement of standard state (0.1MPa, 20 ℃) should be calculated as follows:
O
s=K
o·O
2……………………(6)
P
b=P+9.8×10
3H…………………………(9)
In formula:
OS---sewage oxygen requirement under standard state, kgO2/d;
Ko---oxygen requirement correction factor;
O2---sewage oxygen requirement, kgO2/d;
CS (20)---saturated dissolved oxygen concentration in clear water under standard conditions, get 9.2mg/L;
CSb (T)---under T ℃, atmospheric pressure, the mean value of mixed solution saturated dissolved oxygen concentration in the nitrated device that circulates, mg/L;
CS (T)---under T ℃, atmospheric pressure, clear water surface saturated dissolved oxygen concentration value, mg/L;
Co---mixed solution residue dissolved oxygen, generally get 2mg/L;
α---the ratio of total oxygen transfer coefficient in total oxygen transfer coefficient and clear water in mixed solution, generally get 0.8~0.85;
The ratio of the saturation values of dissolved oxygen in the saturation values of dissolved oxygen of β---mixed solution and clear water, generally get 0.9~0.97;
F---aeration diffusion facilities damage factor, generally get 0.65~0.9;
ρ---pressure correcting coefficient;
P1---location true pressure, Pa;
T---design water temperature, ℃;
Pb---the absolute pressure in air-diffuser exit, Pa;
The fitting depth of H---air-diffuser, m;
P---barometric point, P=1.013 * 105Pa;
The coefficient of oxygen utilization of EA---air-diffuser, generally provided by manufacturer;
Ot---the volume percent of oxygen in the utility model water surface evolving gas after aeration.
5) under standard state, the blast aeration air demand is calculated as follows:
S=G
s×0.21×1.331=0.28G
s………(13)
In formula:
The coefficient of oxygen utilization of EA---air-diffuser, generally provided by manufacturer;
Os---sewage oxygen requirement under standard state, kgO2/d;
S---oxygen-supplying amount, kgO2/h;
0.21---oxygen is percentage in air;
1.331---in the time of 20 ℃, the density of oxygen, kg/m3;
Air demand under Gs---standard state, m3/h.
6) the utility model should arrange a set of standby blast aeration equipment.
7) should select low noise gas blower, the air blast machine room should be taked the sound insulation and noise reduction measure, and meets the regulation of GB12523.
8) single-stage high-speed aeration centrifugal blower should meet the regulation of HJ/T278; Root's blower should meet the regulation of HJ/T251; Micro-hole aerator should meet the regulation of HJ/T252.
5. the speed of reaction in the utility model biochemical kinetics of intermittent water inflow
Active sludge in the utility model of lab scale in double oxygen negative area is batch culture.The bacterium of batch culture can not continuously breed.When bacterial equilibrium is grown, its chemical constitution is constant.This has simplified the mensuration work of bacterial cultures proliferation rate, because measure the proliferation rate that the rate of increase of any composition in bacterial cultures just is enough to represent bacterium.
Therefore, the proliferation rate of the bacterial cultures of balanced growth can mean with following formula:
In formula, μ---proliferation rate constant, or claim than proliferation rate h
-1;
X---bacterial concentration, mg/L.
T---the reaction times, h.
Adopt the solids concn MLSS of mixed solution to replace the bacterial concentration x alive in above formula, and with capitalizing
X means, unit is mg/L.That is:
In addition, the proliferation rate formula of bacterium meets the Monod equation:
In formula, μ max---maximum proliferation rate constant, or claim high specific proliferation rate, h
-1;
K
s---saturation constant,
the time the concentration C value;
C---organic concentration, mg/L.
From formula (17), can draw, when nutrient concentrations is very low, the μ value reduces, thereby the growth velocity of bacterium descends thereupon.With the increase of nutrient concentrations, the μ value increases, and growth velocity also just rises, and obtains larger biomass.But the growth velocity of bacterium also slows down.Little test result shows, in temperature, is about 30.During C, the minimum total organic matter concentration of oxygen negative area of holding concurrently in the utility model, nutrient concentrations, be the 150mg/L left and right.In the exponential growth stage, there is following proportional relationship between the multiplication rate dX/dt of bacterium and the nutraceutical minimizing speed dC/dt of restriction:
In formula, Y is performance factor (yield factor), and its connotation is shown out in following formula:
As seen from the above equation, Y represents the bacterium quality that every gram nutrition produces.
By formula (17) substitution formula (18), can obtain:
In formula, r
cspeed of reaction in one biochemical kinetics, mg/(L.h).
When substrate concn is very little:
If constant
(unit is L/(mg.h)), can obtain the biochemical reaction rate r in double oxygen negative area in the utility model under the low concentration sewage condition
cexpression formula:
(2) reaction times determines
When the utility model is done to material balance, should grasp two principal character: the one, carry out in process the input and output without material in reaction; The 2nd, due to the effect of airflow stirring, in aerobic zone, material fully mixes, the concentration homogeneous, and also the concentration of reaction system only changes with the reaction times.Therefore can do material balance to whole device.
To biochemical reaction, the optional substrate of the component of accounting and product, also can account by bacterium.As response matrix and product are done to material balance, its fundamental relation formula is:
[component enters the amount of this volume element]=[component flows out the amount of this volume element]+[amount that in volume element, component transforms]+[component semi-invariant in volume element]
According to above formula, to the stereo ecological of the periodical operation nitrated device that circulates, its material balance formula should be:
The cumulative speed of reactive component conversion rate=reactive component
?
Can be obtained fom the above equation:
In formula, V
r---reactor effective volume, L;
N
c---the amount of matrix, mg.
To liquid phase reaction:
If make t=O, C=Co; T=t, C=Ct, by formula (24) variables separation integration, obtains:
By formula (21) substitution formula (25), can obtain the circulate expression formula of reaction times t of nitrated device of stereo ecological under the low concentration sewage condition:
By the reaction times T=24 of the mounted cast of lab scale, can try to achieve respectively the k value of reactor for treatment sanitary sewage under differing temps: when temperature is 11 ℃, K=5.3 * 10
-5l/mg.h, when temperature is 30 ℃, K=1.3 * 10
-4l/mg.h.
Above-mentioned data show: under the low condition of water inlet substrate concn, temperature has considerable influence to the kinetic rate of the double oxygen biology in lab scale reaction unit model.Temperature is higher, and biochemical reaction rate is faster.
(3) the utility model effective volume
To the utility model of periodical operation, reactant will reach certain level of response, or bacterium will reach the needed reaction times of finite concentration, only relevant with the speed of process, and irrelevant with the device size.To the utility model of periodical operation, its effective volume size is to be determined by the treatment capacity of reaction mass.If the time in a periodical operation operational cycle of the present utility model is T, have:
T=t+
tb………………………………(27)
In formula, t---reaction times, h;
T
b---overhead time, h.
Production task according to the rules, requiring the volume of material that this device should be processed within the unit time is Vo, and unit is L/h, and the effective volume of this device is:
V
R=V
0(t+t
b)………………………………(28)
In formula, VR---device effective volume, L.
Therefore, should consider t overhead time
bsize, and then more reasonably determine the effective volume of device.
6. the utility model speed of reaction of operate continuously
(1) hydraulic detention time of device
Matrix (organism) is done and accounted, have: input+circulation=consumption+output
That is:
QC
0+RQC
t=V
Re
C+Q(1+R)C
t………………………………(29)
In formula, the flow of Q---reaction solution, m;
R---reflux ratio, i.e. Matter Transfer ratio or volume ratio;
Co---the concentration of water inlet mesostroma, mg/L;
The concentration of Ct---phegma and water outlet mesostroma, mg/L;
V
r---the effective volume of device, L:
Rc---the speed of reaction in biochemical kinetics, mg/(L.h).
Can be obtained fom the above equation:
If make hydraulic detention time (HRT) be
t in formula only represents the hydraulic detention time of material in device, and does not represent the true residence time of a certain micro unit, and unit is h, by formula (21) substitution formula (30), can obtain the expression formula of the hydraulic detention time T of auto levelizer:
(2) device effective volume
Can obtain the utility model effective volume V by formula (30) and formula (21)
rfor:
In formula, V
r---device effective volume, L.
(3) reflux ratio
If reflux ratio is R, the returned sluge flow is RQ.Under steady state conditions, the device bacterium is accounted:
Input+internal circulating load+increment=work output
That is:
QX
0+RQX
r=Q(1+R)X
t………………………………(33)
In formula, Q---reaction solution flow, L;
X
o---bacterial concentration in water inlet, mg/L;
Xr---bacterial concentration in phegma, mg/L;
R---rate of bacterial growth, mg/(L.h);
X
1---bacterial concentration in the device water outlet, mg/L.
Visible, in device, bacterial concentration (sludge concentration) is closely related with the value of reflux ratio, useful volume and mud enrichment factor.Therefore it is most important to choose suitable reflux ratio in design process.
7. the utility model is applied in the simultaneous denitrification dephosphorization experiment
Circulation nitration reaction district B is to be 4-6h in the reaction times in operating parameter, MLSS is controlled in the scope of 2500-7000mg/L, aerobic zone C(rising area) DO is in 2-5mg/L, hold concurrently oxygen negative area (decline district) DO in 0.3-1.0mg/L, the pH value of circulation nitration reaction district B is 7-7.8, and reflux ratio is 2.5-5.Substantially realized removing organic pollutant, ammonia nitrogen and phosphorus.
Its characteristic is: circulation nitration reaction district B is to be water inlet operation continuously under the 4-6h operational conditions in the reaction times in operating parameter, (1) when influent COD is the 300mg/L left and right, the COD of water outlet can be reduced to 13mg/L, the clearance of COD can reach 95% left and right, (2) when the ammonia nitrogen of water inlet is 118.7mg/L, the ammonia nitrogen concentration of water outlet is 5-15mg/L, and the clearance of ammonia nitrogen reaches more than 93%; (3) when the phosphate concn of water inlet be about 10.5mg/L constantly, the phosphate concn of water outlet is also at 2.7mg/L left and right, removal rate of phosphate average out to 73.8%.Adopt respectively SEM and opticmicroscope to carry out the biophase observation to biological particles in system and suspension microorganism, microbial components in the discovery system is complicated and grow fine, and multiple-microorganism coexists mutually.Anaerobic zone exists a large amount of suis, tyrothricin and a small amount of thread fungus, and there is a large amount of stock bacterium in aerobic zone, and thread fungus and a small amount of coccus also have the protozoon metazoans such as many ciliates, nematode to exist in suspended sludge.
The utility model is to SS, BOD
5, CODcr, ammonia nitrogen, total nitrogen and phosphorus removal:
(1) removal of SS
In sewage effluents, concentration of suspension not only relates to water outlet SS index, the BOD in water outlet
5, the indexs such as CODCr, TP are also relevant with it.Because form the main component of water suspension, be the active sludge flco, the organic component of itself is just high, and organism itself is phosphorous, so higher goes out the BOD that water suspension content can make water outlet
5, CODCr and TP increase.So it is the most basic controlling the SS index of sewage effluents, is also very crucial.Under the condition of select appropriately in processing scheme, the processing parameter value is reasonable and optimization monomer structures design, can make water outlet SS index meet the requirement of national standard fully.The rhizome system that the utility model is powerful with plant and ecological filler complete the deodorizing dephosphorization denitrogenation of waste water and process, and quiescent setting is compared the mode of continuous precipitation, can guarantee the SS of lower concentration water outlet.
(2) BOD
5removal
In sewage, the removal of BOD5 is adsorption and the metabolism by microorganism, to the BOD5 degraded, utilizes BOD5 to synthesize new cell, then mud is separated with water, thereby completes the removal of BOD5.Microorganism in active sludge, under the condition of aerobic, for the synthesis of new cell, carries out katabolism by another part organism in order to obtain the synthetic required energy of cell by a part of organism in sewage, and its final product is CO
2and H
2the stable materials such as O.In anabolism and catabolic process, dissolved organic matter (as low molecular organic acids etc.) directly enters cell interior and is utilized, but not at first dissolved organic matter is attracted to the microorganism surface, enters cell interior after then being hydrolyzed by extracellular enzyme and is utilized.As can be seen here, the aerobic metabolism of microorganism all works to the dissolved organic matter in sewage and non-solubility organism, and meta-bolites is harmless stable material, and therefore, the remaining BOD5 concentration that can make to process in rear sewage is very low.
In the utility model, by active bio flora digestion organic pollution materials, improved natural purifying ability, to reach the purpose purified water.Except the bacterium of finding in the traditional active sludge system, also inoculation has other 2000-3000 kind of plant, animal and microorganism.The organism of inoculating has the ability that the oneself synthesizes and absorb sun power, and this ability has guaranteed that pollutent obtains biological degradation to greatest extent.
(3) removal of CODcr
Principle and BOD that in sewage, CODcr removes
5basic identical.
The clearance of Sewage Plant CODcr, depend on the biodegradability into water, and the composition of its sewage is relevant.For sanitary sewage, its BOD
5/ CODcr>=0.5, the good biodegradability of sewage, water outlet CODcr value can be controlled at lower level, can meet the demands.
The sewage that the utility model is processed mainly be take sanitary sewage as main, its BOD
5/ CODcr value is 0.5, and sewage has biodegradability preferably, adopts second-stage treatment technique to meet the demands.
(4) removal of ammonia nitrogen
Sewage is removed the ammonia nitrogen method and is mainly contained physico-chemical processes and the large class of biological process two, and in the sanitary sewage disposal industry, biological process removal ammonia nitrogen is main flow, is also economical in sanitary sewage disposal and method commonly used.
Nitrogen is the indispensable integral part of protein, therefore extensively is present among sanitary sewage.In raw waste water, nitrogen exists with the form of NH4+-N and organonitrogen, and the nitrogen of these two kinds of forms is combined and is referred to as kjeldahl nitrogen, with TKN, means.And the NOx-N(in raw waste water comprises nitrite and nitrate) content seldom, almost nil.These multi-form nitrogen are referred to as total nitrogen (TN).
Nitrogen is also one of element formed microorganism, and a part enters nitrogen in cell paste will be with excess sludge-rise and remove from water.This part nitrogen amount is about removed BOD
55%, be 12% of microorganism wt, account for 4% of Sewage treatment systems residual active sludge amount.
When organism is oxidized, the organonitrogen in sewage also is oxidized to ammonia nitrogen, in the situation that dissolved oxygen is sufficient, load is lower, mud is longer age, further is oxidized to nitrite and nitrate, usually is referred to as nitrifying process.Its reaction equation is as follows:
NH
4 ++1.5O
2→NO
2 -+2H
++H
2O
N?O
2 -+0.5O
2→N0
3 -
The first step reaction completes by Nitrosomas, and the second step reaction completes by nitrifier, and total reaction is:
NH
4 ++2O
2→NO
3 -+2H
++H
2O
Therefore, adopt the plant of flourishing rhizome to absorb ammonia nitrogen, clearance is high.
(5) removal of total nitrogen
Ammonia nitrogen in waste water is oxidized to nitrate through nitrification, although the concentration of ammonia nitrogen reduces, the total nitrogen in waste water is not reduced, and for reducing total nitrogen, just must remove the nitrate nitrogen in waste water.The most ripe technique is denitrification at present,, under anoxia condition, under the effect of facultative denitrifier (denitrifying bacteria), nitrate nitrogen is reduced into to nitrogen and overflows, thereby reduce the total nitrogen in waste water.The methyl alcohol of take is example as carbon source, and its reaction equation is as follows:
6NO
3-+2CH
3OH→6NO
2-+2CO
2+4H
2O
6NO
3-+3CH
3OH→3N
2+3CO
2+3H
2O+6OH-
The utility model is supported plant 4 by many group water is set in contact-oxidation pool 2, absorbs ammonia nitrogen with the flourishing rhizome of plant, thereby improves the clearance of total nitrogen.
(6) removal of phosphorus
Biological phosphate-eliminating be polyP bacteria in sewage under anaerobic, be subject to constraining and discharge phosphoric acid salt body in, generate energy is in order to absorb the fast degradation organism, and is converted into PHB(and gathers the β hydroxybutyric acid) store.When these polyP bacterias enter the PHB generate energy that aerobic condition lower time just degrades in body and store, for the synthetic of cell with inhale phosphorus, form the phosphorus containing sludge of high density, discharge system with excess sludge, thereby reach the purpose of dephosphorization.
The rhizome that the utility model utilizes water to support plant 4 prosperities absorbs phosphorus, in operational process, without power consumption, avoids the use of chemical substance fully, and maintenance cost is only that expense is added in the maintenance costs of plant and the replacing of broken filler.
If, to being sealed deodorizing between sludge dewatering, can increase investment, and management is also inconvenient.Do not establish preliminary sedimentation tank because of the utility model, there is no raw sludge, mud residence time in sludge sump is short, and carries out aerobic sigestion, and sealing treatment, and the stink distributed can weaken to some extent.Arrange separately between sludge dewatering and between fortune mud, note at ordinary times strengthening management, the mud of generation press dry outward transport in time, and the impact of stink can be controlled in the scope of bearing.If can adopt enclosed centrifugal drier, more can weaken distributing of stink.
In the utility model, obvious by the plant action deodorising effect, and can improve landscape effect.Sewage stink after processing by deodorizing district A reduces greatly.
Adopt the utility model transformation or newly-built Sewage treatment systems external form view beautiful.Outside also can have greenhouse, and greenhouse adopts light steel skeleton structural glass chamber; In system, be ecoscape, the nitrated device deodorizing of built-in stereo ecological outer circulation; Greenhouse can guarantee that plant and other organism keep vigorous vigor under preferred ambient temperature, and this ecological sewage treatment facility, can build remote districts in, can be applicable to strict high-grade community, and each community's environmental protection is had to positive effect.
8. the comparison of application the utility model and traditional technology in the Sewage treatment systems upgrading
Referring to table 1, the utility model and MBR technique, contact oxidation technology are relatively, be no matter that effluent quality, stable effluent quality, Nitrogen/Phosphorus Removal, deodorizing subtract carbon effect, excess sludge index or other indexs of correlation, working cost, all be better than other two kinds of techniques.As can be seen here, adopt the wastewater effluent water quality after the utility model is processed good, can stablize the country-level A standard that reaches, meet middle water reuse requirements such as afforesting, flush the toilet, also can be used as the ecoscape make up water.Simultaneously, particularly have extremely excellent denitrification effect, the water outlet ammonia nitrogen can reach surface water II generic request, has overcome the low defect of other technique denitrification effects.It has good ecological purification environment, and the resistance to overload shock ability is strong, stable effluent quality, and excess sludge is few.And not only effluent quality is good, and the external form view is beautiful, and operating automation degree is high, substantially can realize unmanned.
The utility model adopts integrated technology, and the facility characteristics of compact layout, can select suitable element number to carry out layout footprint as required, and due to integrated setting, construction investment and operational and administrative expenses are lower.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.