CN202116375U - Aeration biofilter for domestic sewage - Google Patents
Aeration biofilter for domestic sewage Download PDFInfo
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- CN202116375U CN202116375U CN2011202356703U CN201120235670U CN202116375U CN 202116375 U CN202116375 U CN 202116375U CN 2011202356703 U CN2011202356703 U CN 2011202356703U CN 201120235670 U CN201120235670 U CN 201120235670U CN 202116375 U CN202116375 U CN 202116375U
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Abstract
The utility model discloses an aeration biofilter for domestic sewage. An inner cavity of a tank is divided into a lower anaerobic reaction area and an upper aerobic reaction area, a back flushing water drainage pipe, an aeration pipe and a filter material carrying structure are successively disposed between the anaerobic reaction area and the aerobic reaction area from bottom to top, biological filter materials of the aerobic reaction area are accumulated on the filter material carrying structure, the anaerobic reaction area is provided with a plurality of hangers for hanging anaerobic biological packing, a water inlet pipe is disposed on the lower portion of the tank, a water drainage pipe is disposed at the top of the tank, the water drainage pipe is provided with a bypass backflow pipe communicated with the bottom water inlet pipe, and volume ratio of the anaerobic biological packing of the lower anaerobic reaction area and the biological filter materials of the upper aerobic reaction area is 1:2.5-1:4. The anaerobic area and the aerobic area which are separated traditionally are integrated, pre-denitrification is realized, and accordingly the aeration biofilter for domestic sewage not only effectively removes pollutants in water, but also is high in sewage removal efficiency, is provided with simple equipment, and is easy in operation and convenient in repair and maintenance.
Description
Technical field
The utility model relates to sewage treatment area, especially relates to a kind of BAF of sewage.
Background technology
BAF is the sewage treatment technique that rises the beginning of the nineties, and is widely popular in developed countries such as American-European and Japan, and this technology has the effect of removal SS, COD, BOD, nitrated, denitrogenation, dephosphorization, removal objectionable impurities; Be characterized in collecting bio-oxidation and hold back suspended solids and one, saved post precipitation pond (second pond), its volumetric loading, hydraulic load are big; Hydraulic detention time is short, and required initial cost is few, and effluent quality is good; Operation energy consumption is low, economic operating cost.
Because BAF not only will be removed COD, BOD; Also to remove technologies such as ammonia, dephosphorization; Making BAF that a plurality of ponds need be set and carry out different treatment steps, is that the patent documentation of CN200620060152.1 discloses a kind of folded formula BAF like application number, comprises that one is fallen streaming preaeration biological filter and two flow lifting type BAFs; This structure floor space is big, and equipment and technology is complicated.And the main difficulty that restricts BAF device miniaturization, technology simplification at present is the nitrification and denitrification link.Nitrated being meant under aerobic condition, the autotrophic type nitrobacteria is nitrous acid (salt) and nitric acid (salt) with ammonia oxidation; Denitrification is meant that nitrous acid (salt) and nitric acid (salt) under the effect of heterotroph denitrifying bacterium, are reduced to the process of nitrogen.Through two steps of nitrification and denitrification, can remove the ammonia that exists in the sewage.
Denitrification process commonly used has two kinds, and a kind of is synchronous nitration and denitrification (being SND), is meant in same biofilm reactor, has produced aerobic section and anoxic section because aeration is inhomogeneous, thereby has made nitrification and denitrification carry out synchronously.Because organic carbon source is the inhibitory substance of nitrification, but is the electron donor of denitrification, organic carbon source is consumed at aerobic zone, and the oxygen-starved area inner at the mikrobe flco can not get electron donor, and denitrification rate just reduces, and SND deoxidation efficient can be not high yet.Another kind is Prepositive denitrification (being SBR), is meant according to anoxic-aerobic-deposition-drainage pattern operation, accomplishes the SBR technology of intaking in the anoxic stage, and after aerobic stage finishes, the NO of generation
3 -With the water outlet outflow system, all the other get into the anoxic stage of next cycle Deng a part, utilize the carbon source in the water inlet to carry out the denitrification deoxidation.
Prepositive denitrification has advantages such as nitrification efficiency height; But existing pre-denitrification biological aerated filter all adopts series connection of many ponds or synergetic mode to carry out Prepositive denitrification; Like application number is that the patent documentation of CN200920171675.7 discloses a kind of pre-denitrification and denitrogenation biological filter group, and this filter tank group is composed in series by anoxic denitrification biological filter and aerobic nitrification biological filter; Application number is that the patent documentation of CN201020122796.5 discloses a kind of pre-denitrification biological aerated filter, is provided with preposition pond, main pond and clean water basin; Application number is the treatment process that the patent documentation of CN200910071318.8 discloses a kind of Prepositive denitrification bio-filter, comprises denitrification filter pool and BAF; Application number is that the patent documentation of CN200910116556.6 discloses a kind of integrated pre-denitrification and denitrogenation biological filter sewerage treatment process, is formed by anoxic denitrification biological filter and aerobic nitrification biological filter series combination.This mode has not only increased the equipment cost input, and operating method is complicated, and run duration maintenance work amount is big.
The utility model content
To above-mentioned technical problem, the utility model provides a kind of BAF of sewage, and oxygen-starved area and aerobic zone that the tradition branch is arranged combine; Carry out Prepositive denitrification; Not only effectively removed the pollution substance in the water, and detersive efficiency is high, equipment is simple; Processing ease is convenient to maintenance.
The technical scheme of the utility model is following:
A kind of BAF of sewage, tank inner chamber are divided into the hypoxia response district of Lower Half and the aerobic reactor zone of the first half, are disposed with back flushing water shoot, aeration tube and filtrate bearing structure between hypoxia response district and the aerobic reactor zone from bottom to top; The biofilter material of aerobic reactor zone is deposited on the said filtrate bearing structure, and the hypoxia response district is provided with many groups hanger of suspension anaerobe filler; The tank body bottom is provided with water inlet pipe, and the top is provided with water shoot, and water shoot is provided with the bypass return line and is communicated with the bottom water inlet pipe, and the volume ratio of the anaerobe filler in Lower Half hypoxia response district and the biofilter material of first half aerobic reactor zone is 1:2.5～1:4.
It is further characterized in that: said filtrate bearing structure is made up of lower floor's Frame for supporting parallel pipes and upper strata silk screen layer, and silk screen is a stainless steel.
Said bypass return line is provided with and opens and closes valve and flow valve.
The utility model beneficial technical effects is:
1, the utility model adopts Prepositive denitrification technology, with synchronous nitration and denitrification technology comparatively speaking, the utlity model has following advantage:
(1) COD handles: in Prepositive denitrification technology, in the thick oxygen-starved area of orlop 500mm, COD removes most effective, and the COD concentration that is in operation is 420mg/l, and the COD load is 2.34kg/ (m
3.d) time, sewage is reduced to about 80mg/l through this filtering layer COD concentration, and the COD clearance is more than 80%; At aerobic zone, COD concentration does not significantly reduce, and final COD water outlet is below 50mg/l; Clearance has substantially exceeded the COD clearance of synchronous nitration and denitrification technology 52 ~ 62% about 90%.
(2) NH
3-N handles: in the Prepositive denitrification technology, and the oxygen-starved area NH that orlop 500mm is thick
3-N removes most effective, is in operation when influent load 1.1 ~ 2.4m/h this filtering layer NH
3-N clearance is more than 80%, and the final outflow water clearance reaches 95%, also is superior to the NH of synchronous nitration and denitrification technology
3-N clearance about 40%, the processing index of final outflow water clearance about 85%.
(3) total nitrogen content (TN) is handled: synchronous nitration and denitrification technology is undesirable to the removal effect of TN, and denitrification percent is merely about 30%.Prepositive denitrification technology has denitrification effect preferably, if competent carbon source is arranged in the former water, denitrification percent can reach 80 ~ 90%.
In sum, because the backflow effect makes that the shock proof ability of Prepositive denitrification technology is stronger, effluent quality is better relatively.Just the performance of the filtrate of China's production at present sees that will obtain desirable anoxic microenvironment has suitable difficulty, if there is the denitrogenation requirement should adopt Prepositive denitrification technology; If former water COD concentration is higher; Although there is not the denitrogenation requirement, still optional Prepositive denitrification technology because the degraded of the quick COD in oxygen-starved area the load of follow-up aerobic section; Simultaneously can realize denitrification functions, kill two birds with one stone.The diluting effect of recirculation water makes Prepositive denitrification technology remove COD and NH
3The stability of-N is higher than synchronous nitration and denitrification technology far away.
2, the COD clearance of the utility model is higher, and reason is:
(1) COD in the former water is used as the carbon source of Prepositive denitrification;
(2) recirculation water has diluting effect to former water;
(3) recirculation water carries a spot of dissolved oxygen and gets into the oxygen-starved area, is partly dissolved oxygen and is preferentially utilized by the organism in the water;
(4) though former water mixes the process denitrification with recirculation water after; COD concentration reduces greatly, thereby aerobic zone biological degradation effect is not obvious relatively, but because the recirculation water increase; The increase of hydraulic load; Strengthened the washing away of filler, microbic activity is improved, the COD clearance of aerobic zone is still higher.
3, the aerobic zone of the utility model adopts the parallel rising of air water, and following advantage is arranged:
(1) the parallel rising of air water makes air water carry out fabulous dividing equally, and has prevented the stifled phenomenon of bubble nucleus of condensation gas in filter material layer, and the utilization ratio of oxygen is high, and energy consumption is low;
(2) opposite to flowing through filter with down, upward flow filtration maintains positive pressure is provided on the height of whole filter tank, can better avoid forming channel or short stream, thereby avoids influencing the air pocket that filtration process forms through the channel that forms;
(3) adopt the parallel upward flow of air water; Spatial filtering can better be used, and air can be brought solid matter into the filter bed depths, in the filter tank, can obtain high loading, uniform solid matter; Thereby prolonged backwashing period, the air water amount of using when reducing scavenging period and cleaning;
(4) filter material layer prolongs the residence time of bubble in the filter tank to the cutting action of bubble, has improved the utilization ratio of oxygen, because the fabulous retaining power in filter tank makes the utility model back not need to establish secondary sedimentation basins again.
4, the utility model has adopted the suitable aerobic zone and the volumetric ratio of oxygen-starved area, and this is that the COD clearance of oxygen-starved area is higher because comparatively speaking, and suitable volumetric ratio can improve removal efficient and the speed of COD.
5, the utility model has adopted suitable GWR; This is because the removal efficient of COD is along with the increase of GWR is progressively risen, when GWR when 1:1 is increased to 3:1, the clearance of COD obviously rises; But when GWR when 3:1 is increased to 4:1, the COD removal effect does not have considerable change.This mainly is because GWR is when relatively low; Nitrification is relatively poor; Organism in the required consumption water inlet of preposition denitrogenation is less, and organic removal is mainly accomplished at aerobic zone, when GWR is higher; Nitrification is comparatively complete, and organism mainly is used as denitrifying carbon source and is able to remove in the oxygen-starved area.
6, the utility model has adopted suitable backwash speed and time; This is because filler material, the density of oxygen-starved area and aerobic zone are had any different, and for reaching best biological activity, takes the backwash hydraulic load of certain intensity very important; The little mud of then retaining of intensity; Cause operation to block, intensity greatly then causes mikrobe to be washed away excessively, and living weight reduces.
Description of drawings
Fig. 1 is the middle section figure of the utility model.
Fig. 2 be among Fig. 1 the A-A section to view.
Fig. 3 be among Fig. 1 the B-B section to view.
Fig. 4 be among Fig. 1 the C-C section to view.
Fig. 5 be among Fig. 1 the D-D section to view.
Fig. 6 be among Fig. 1 the E-E section to view.
The practical implementation method
Below in conjunction with accompanying drawing, the embodiment of the utility model is described.
As shown in Figure 1; The described BAF of the utility model is by anoxic denitrification biological filter and aerobic biofilter be combined into, in same tank body 1, is divided into the hypoxia response district 11 of Lower Half and the aerobic reactor zone 3 of the first half; Treatment sewage gets into tank body 1 from the water inlet pipe 12 of tank body 1 bottom; Successively through hypoxia response district 11 and aerobic reactor zone 3, react thereby Prepositive denitrification takes place in tank body 1 from bottom to top, reacted water outlet is flowed out through the water shoot 2 at tank body 1 top; The part water outlet refluxes through return line and imports bottom water inlet pipe 12, other water outlet qualified discharges.
Like Fig. 1, shown in Figure 2, water inlet pipe 12 lies across in the bottom of tank body 1, is evenly equipped with the prosopyle of some Φ 6mm in water inlet pipe 12 both sides, and water inlet pipe 12 is imported by outside two-way water inlet, and one the tunnel is sewage water inlet pipe 12-1, and one the tunnel is effluent recycling pipe 12-2.The bottom of tank body 1 is many groups hanger of suspension anaerobe filler 10, and anaerobe filler 10 adopts corrosion resistants, heatproof, ageing-resistant polyolefins and the high-quality raw material of polymeric amide, mixes with auxiliary agents such as hydrophilic, absorption, heat resistanceheat resistant oxygen; Adopt special wire drawing, strand system hair technology; Strand interted anchor on corrosion resistant, the high-intensity axial cord, because selection and technical recipe are superior, hard and soft appropriateness; Make strand be three-dimensional evenly distributed radiation regimes; Processed the monomer of suspension type 3 D elastic filler, filler can stereoscopic and omnibearing in the effective area be evenly unfolded and is abound with, and makes gas, water, microbial film obtain fully mixing and oozes the contact exchange.Sewage is through this part the time, and denitrifying bacterium is under anoxia condition, and reduction nitrate salt discharges molecular nitrogen (N
2) or nitrous oxide (N
2O).
As shown in Figure 3, above the middle part of tank body 1, hypoxia response district 11, be positioned at the back flushing water shoot 9 that is provided with X-spread, on water shoot 9, be evenly equipped with the water vent of some Φ 6; As shown in Figure 4, above back flushing water shoot 9, be provided with multiple row aeration tube 8, on aeration tube 8, be evenly equipped with the solarization air cap of some Φ 4mm, 7 pairs of top biofilter materials in aeration zone 4 carry out aeration oxygen replenishing during work.As shown in Figure 5; Above aeration tube 8, be made up of the bearing structure of biofilter material 4 Frame for supporting parallel pipes 6 and Stainless Steel Cloth 5, wherein Frame for supporting parallel pipes 6 is arranged in down one deck, and last layer is 60 purpose Stainless Steel Cloths 5; Biofilter material 4 is deposited on the Stainless Steel Cloth 5, has formed aerobic reactor zone 3.Biofilter material 4 adopts " WX-II type " biofilter material, and the physical property of WX-II type highly effective filtering material for biology is as shown in table 1, and it is processed by the volcanics ore; Under the thermochemistry effect; Become and be similar to carbon globular material, its major ingredient is a silicate, and physical and chemical performance is strong; Be particularly suitable for mikrobe in its surface growth, breeding, form microbial film.In handling the waste water process, generate microbial film on the filter material surface, produce the synergistic biological wastewater treatment process of absorption and microbiological oxidation decomposing organic matter.This method has improved organic clearance in the waste water; Increased stability, improved the performance of sludge dewatering and digestion, prolonged the work-ing life of gac poisonous substance and load variations; Be a kind of be main with biological treatment, have the biological treatment new technology of materialization processing feature simultaneously.
Table 1: the significant parameter index of biofilter material
The aeration intensity of the utility model (GWR) value is important operating parameter, and GWR is the simple algorithm on the engineering, and basis is the volume ratio of air water, and accurately calculating should be confirmed by the oxygen-consumption of water treatment in fact.Can know that according to practice the removal efficient of COD is along with the increase of GWR is progressively risen, when GWR when 1:1 is increased to 3:1, the clearance of COD obviously rises, but when GWR when 3:1 is increased to 4:1, the COD removal effect does not have considerable change.This mainly is because GWR is when relatively low; Nitrification is relatively poor; Organism in the required consumption water inlet of preposition denitrogenation is less, and organic removal is mainly accomplished at aerobic zone, when GWR is higher; Nitrification is comparatively complete, and organism mainly is used as denitrifying carbon source and is able to remove in the oxygen-starved area.
As shown in Figure 6, water shoot 2 is arranged on the top of tank body 1, and water shoot 2 is a multiple row, is evenly equipped with the water vent of Φ 4～Φ 8mm.The exterior line one tunnel of water shoot 2 is discharge pipe line 2-1, and another road is back flushing suction culvert 2-2.On discharge pipe line 2-1, also be provided with the bypass of recirculation water; This pipeline is provided with opening-closing valve and flow valve, according to actual ammonia-nitrogen content in the waste water, for lower sewage types of ammonia nitrogen such as painting dressing automobiles waste water; The denitrogenation that need not reflux during processing then can be closed opening-closing valve; And,, then open opening-closing valve because ammonia-nitrogen content is very high for trade effluents such as sewage and food, pharmacy, wine brewing, water outlet is refluxed and controls different reflux ratios.
Because what the aerobic zone of BAF adopted is the fixed bed filtrate; Not only the surface attachment microbial film of filtrate plays the catalytic oxidation effect, and a large amount of micropores of filtrate self have played filteration, through the operation of certain hour; Dead biofilm detachment, filtrate bottom are because filteration; Micropore is blocked, and should take the back flushing measure this moment, improves the activity of aerobe filtrate.When needs carried out back flushing, the utility model utilized the water distribution pipeline of top water shoot 2 as backwashing water, and backwashing water carries out spray irrigation to the biofilter material 4 of aerobic reactor zone 3 from top to bottom, and the back flushing water shoot 9 through the middle part flows out then.Hypoxia response district (acidication district) can not with the synchronous backwash of aerobic reactor zone; This is owing to dissolved oxygen (DO) concentration in the aerobic reactor zone draining is higher; And the work mikrobe of hydrolysis area is anerobes and double oxygen bacterium mostly, after high DO waste water gets into hydrolysis area, will influence anoxic and the activity of oxygen bacterium of holding concurrently.For the backwash in hypoxia response district, the utility model adopts discharging excess sludge method to come backwash.The utility model is arranged on back flushing water shoot 9 between hypoxia response district and the aerobic reactor zone, therefore can in time discharge the backwashing water of aerobic reactor zone.
Because the oxygen-starved area and the filler material of aerobic zone, the difference of density; For reaching best biological activity, take the backwash hydraulic load of certain intensity very important, the little mud of then retaining of intensity; Cause operation to block, intensity greatly then causes mikrobe to be washed away excessive living weight reduction.big flow velocity backwash when the flushing of oxygen-starved area can be adopted the excess sludge spoil disposal, generalized case is not more than the hydraulic load of 3m/h, and the backwash time (spoil disposal time) is no more than 5min; Aerobic zone backwash intensity because packing density is big, generally adopts the hydraulic load of 8m/h, and the backwash time is for being 8 ~ 10min.
Utilize the BAF of the utility model, can effectively handle sewage.
The common ammonia-nitrogen content of sewage is very high, COD/BOD
5＞30%, than higher, be prone to biochemical treatment.COD is 300 ~ 400 mg/l after through the pretreatment technology in the similar embodiment 1, BOD
5Be 150 ~ 200mg/l, ammonia nitrogen value>=30mg/l is with the water inlet of the sewage after the above-mentioned steps processing as the utility model.
Water inlet is fed the bottom water inlet pipe 12 of the described BAF tank body 1 of the utility model, sewage through oxygen-starved area filter material layer and aerobic zone packing layer after, Prepositive denitrification takes place handles, and through top water shoot 2 discharge tank bodies 1; Because the ammonia-nitrogen content in the sewage is very high, so present embodiment need be with effluent recycling, and according to the height and the concrete denitrogenation requirement of ammonia-nitrogen content, quantity of reflux reaches as high as 300%; Simultaneously the filtrate volume ratio of the packing volume of aerobic zone and oxygen-starved area is aerobic at V: during the V anoxic=3:1 left and right sides, can obtain COD clearance preferably.The aeration intensity of sewage (GWR) is got 3:1 and is advisable, and other processing parameters are as shown in table 2, and result is as shown in table 3.
Table 2 sewage treatment process parameter list
Table 3 wastewater treatment effluent quality table
Through the adjustment different parameter, the BAF of the utility model can be handled the sewage quality of multiple different speciality, and floor space is little, and special-purpose treating pond need be set, so applying flexible, and cost of investment is low.Can find out from table 3, the utlity model has obvious processing result, can reach 86% for the clearance of COD; The NH3-N clearance can reach 93.2%, and the TN clearance can reach 95.5%, has outstanding economy and environmental benefit.
Claims (3)
1. the BAF of a sewage; It is characterized in that: tank inner chamber is divided into the hypoxia response district of Lower Half and the aerobic reactor zone of the first half, is disposed with back flushing water shoot, aeration tube and filtrate bearing structure between hypoxia response district and the aerobic reactor zone from bottom to top; The biofilter material of aerobic reactor zone is deposited on the said filtrate bearing structure, and the hypoxia response district is provided with many groups hanger of suspension anaerobe filler; The tank body bottom is provided with water inlet pipe, and the top is provided with water shoot, and water shoot is provided with the bypass return line and is communicated with the bottom water inlet pipe, and the volume ratio of the anaerobe filler in Lower Half hypoxia response district and the biofilter material of first half aerobic reactor zone is 1:2.5～1:4.
2. according to the BAF of the described sewage of claim 1, it is characterized in that: said filtrate bearing structure is made up of lower floor's Frame for supporting parallel pipes and upper strata silk screen layer, and silk screen is a stainless steel.
3. according to the BAF of the described sewage of claim 1, it is characterized in that: said bypass return line is provided with and opens and closes valve and flow valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202356703U CN202116375U (en) | 2011-07-06 | 2011-07-06 | Aeration biofilter for domestic sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202356703U CN202116375U (en) | 2011-07-06 | 2011-07-06 | Aeration biofilter for domestic sewage |
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| Publication Number | Publication Date |
|---|---|
| CN202116375U true CN202116375U (en) | 2012-01-18 |
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ID=45457456
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|---|---|---|---|
| CN2011202356703U Expired - Lifetime CN202116375U (en) | 2011-07-06 | 2011-07-06 | Aeration biofilter for domestic sewage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103553211A (en) * | 2013-10-24 | 2014-02-05 | 哈尔滨工业大学 | High-efficiency anti-blocking synchronous nitration and denitrification hierarchy biological aerated filter |
| CN105461058A (en) * | 2015-12-23 | 2016-04-06 | 北京伊普国际水务有限公司 | Biological denitrification device |
| CN105461055A (en) * | 2015-09-24 | 2016-04-06 | 福建方明环保科技股份有限公司 | Aeration aerobic facultative biomembrane digestion reaction apparatus and method thereof |
-
2011
- 2011-07-06 CN CN2011202356703U patent/CN202116375U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103553211A (en) * | 2013-10-24 | 2014-02-05 | 哈尔滨工业大学 | High-efficiency anti-blocking synchronous nitration and denitrification hierarchy biological aerated filter |
| CN105461055A (en) * | 2015-09-24 | 2016-04-06 | 福建方明环保科技股份有限公司 | Aeration aerobic facultative biomembrane digestion reaction apparatus and method thereof |
| CN105461055B (en) * | 2015-09-24 | 2017-12-19 | 福建方明环保科技股份有限公司 | It is aerated aerobic and oxygen biomembrane digestion reaction device and method |
| CN105461058A (en) * | 2015-12-23 | 2016-04-06 | 北京伊普国际水务有限公司 | Biological denitrification device |
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| GR01 | Patent grant | ||
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Granted publication date: 20120118 |
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| CX01 | Expiry of patent term |