CN103641241A - Preposed denitrification aeration biofilter and method for treating sewage - Google Patents
Preposed denitrification aeration biofilter and method for treating sewage Download PDFInfo
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- CN103641241A CN103641241A CN201310694623.9A CN201310694623A CN103641241A CN 103641241 A CN103641241 A CN 103641241A CN 201310694623 A CN201310694623 A CN 201310694623A CN 103641241 A CN103641241 A CN 103641241A
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- sewage
- pond body
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- 239000010865 sewage Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005273 aeration Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 149
- 239000000945 filler Substances 0.000 claims abstract description 16
- 238000011001 backwashing Methods 0.000 claims abstract description 10
- 238000011010 flushing procedure Methods 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 26
- 229910021536 Zeolite Inorganic materials 0.000 claims description 25
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 25
- 239000010457 zeolite Substances 0.000 claims description 25
- 238000009287 sand filtration Methods 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 9
- IPQVRLSXWJPESU-UHFFFAOYSA-N [N].ON=O Chemical compound [N].ON=O IPQVRLSXWJPESU-UHFFFAOYSA-N 0.000 claims description 8
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 244000005700 microbiome Species 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 241000108664 Nitrobacteria Species 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 241001148470 aerobic bacillus Species 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 4
- 238000006396 nitration reaction Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 241000894006 Bacteria Species 0.000 claims description 3
- 230000000593 degrading effect Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 16
- 239000001301 oxygen Substances 0.000 abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 abstract description 16
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 4
- 230000003139 buffering effect Effects 0.000 abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 206010002660 Anoxia Diseases 0.000 description 1
- 241000976983 Anoxia Species 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 208000028804 PERCHING syndrome Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007953 anoxia Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000476 body water Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a preposed denitrification aeration biofilter and a method for treating sewage and belongs to the field of wastewater treatments. The biofilter comprises a DN tank body and a CN tank body and further comprises a first water storage tank body, a second water storage tank body and an aeration pump, wherein a first water storage tank inner cylinder is placed in the middle of the first water storage tank body; an annular water storage tank buffering groove is arranged at the outer side of the first water storage tank inner cylinder; the height of the water storage tank buffering groove is lower than that of the first water storge tank inner cylinder; and the area between the side wall of the first water storage tank body and the first water storge tank inner cylinder is a first water storage tank storage area. As the water flowing direction of the DN tank is upward, suspended solids are prevented from concentrating in a filler layer, the dirt containing rate of a filler is increased, and backwashing interval time is prolonged. By adopting the preposed denitrification aeration biofilter, the dissolved oxygen of the feeding water of the CN tank can be improved without power, so that subsequent additional oxygen supply amount is reduced; and the preposed denitrification aeration biofilter has the advantages of simple structure, convenient operation and low energy consumption.
Description
Technical field
The invention belongs to field of waste water treatment, specifically, a kind of method that relates to pre-denitrification biological aerated filter and dispose of sewage, more particularly, relates to a kind of pre-denitrification biological aerated filter for the sewage disposal containing organism, ammonia nitrogen and the method for disposing of sewage thereof.
Background technology
Biological filter system, due to advantages such as its floor space are little, maintenance cost is low, easy to operate, operational management is convenient, flexible, has been widely used in sewage water denitrification and has processed.Though independent Up-flow Biological Aerated Filter has higher clearance to ammonia nitrogen, very low to the clearance of total nitrogen.In order to increase the clearance to total nitrogen, often adopt the mode combined running of a plurality of filter tanks parallel connection to carry out nitration denitrification denitrogenation.Rear-mounted denitrification filter tank usually exists the problem of carbon source deficiency in the denitrification stage, need additional carbon, and Prepositive denitrification bio-filter denitrification stage microorganism can utilize organism in sewage as carbon source.Therefore, sufficient and need the sanitary sewage of denitrogenation for organism, from running cost, consider that Prepositive denitrification process advantage is obvious.
Pre-denitrification biological aerated filter is formed by anoxic denitrification biological filter (DN pond) and aerobic nitrification biological filter (CN pond) series combination.The Main Function in CN pond is that influent ammonia nitrogen is changed into nitrate nitrogen and nitrous acid nitrogen.DN pond is mainly used to denitrification denitrogenation, and the nitrate nitrogen in the phegma of CN pond and nitrous acid nitrogen are reduced to nitrogen.Nitrobacteria is aerobic bacteria, and reaction must be carried out under good oxygen condition, and dissolved oxygen has restraining effect to denitrification process, and microorganism denitrification need to keep strict anoxia condition.
Because the water inlet of Prepositive denitrification bio-filter CN pond is from the water outlet of DN pond, under the anaerobic environment of DN pond, water outlet DO is low, needs the aerobic environment in a certain amount of additional oxygen-supplying amount guarantee CN pond.In order to reduce aeration rate, save running cost, now more thinking is to adopt efficient oxygen supply mode to reduce energy consumption.As the application number disclosed a kind of pre-denitrification biological aerated filter of utility model patent that is 201020122796.5, application number is that the CN pond of 201120334591.8 the disclosed pre-denitrification biological aerated filter of utility model patent all adopts to upper reaches and promotes air water evenly to mix, and improves oxygen transfer efficiency; Application number is 200910116556.6 the disclosed integrated pre-denitrification and denitrogenation biological filter sewerage treatment process of patent of invention, application number is that 200920171675.7 the disclosed pre-denitrification and denitrogenation biological filter group of utility model patent forms by DN pond and CN pond series combination, the water outlet of DN pond enters CN pond by rising pipe, and highly effective air diffuser system is to oxygen supply in the water of CN pond.
Though above-mentioned efficient oxygen supply mode has improved the transfer efficiency of oxygen, to a certain degree avoided the waste of outer oxygenation, but because CN pond water inlet dissolved oxygen is low, still need the strict aerobic environment of nitrobacteria in a large amount of additional oxygen-supplying amount guarantee CN ponds, simultaneously, existing treatment process also exists processing efficiency low, the problem that cost is high.
Summary of the invention
1. the technical problem that invention will solve
For needing the strict aerobic environment of nitrobacteria in a large amount of additional oxygen-supplying amount guarantee CN ponds in prior art, the problem that processing efficiency is low, increased running cost, a kind of method that pre-denitrification biological aerated filter is provided and disposes of sewage, can improve CN pond water inlet dissolved oxygen, thereby reduce the pre-denitrification biological aerated filter of follow-up additional oxygen-supplying amount, processing efficiency is higher simultaneously, and cost is lower.
2. technical scheme
Object of the present invention is achieved through the following technical solutions.
A pre-denitrification biological aerated filter, comprises DN pond body and CN pond body, also comprises the first tank body, the second tank body and aeration pump; Described DN pond body interior comprises clear water zone, the extra large sand filtration bed of material, supporting layer and water distribution buffer zone from top to bottom successively; Described water distribution buffer zone one side is provided with water-in; One side of described clear water zone is also provided with effluent trough, between effluent trough and clear water zone, by water-stop sheet, separates, and the height of water-stop sheet is lower than the height of DN pond bodies top; One side of described clear water zone is also provided with DN pond back flushing water shoot; The first described tank body middle part is placed with a first tank inner core; The arranged outside of the first described tank inner core has a ring-type tank dashpot, and the height of tank dashpot is lower than the height of the first tank inner core; Region between the sidewall of the first described tank body and the first tank inner core is the first tank water reserve; Described CN pond body interior comprises water distributor, buffer layer, zeolite filler layer, cloth gas-bearing formation and supporting layer from top to bottom successively, and the sidepiece of described buffer layer is connected with a CN pond back flushing water shoot; Described effluent trough is connected with the first tank inner core by a pipeline; The first described tank body is connected with water distributor by pipeline, is also provided with intake pump on this pipeline; The first described tank inner core is connected with water distribution buffer zone by a pipeline, and this pipeline is provided with the second water pump; The bottom of described CN pond body is connected with the second tank body; The second described tank body is connected with water distribution buffer zone by pipeline, is also provided with the first water pump on this pipeline; Described body bottom, CN pond is connected with aeration pump.The water (flow) direction in DN of the present invention pond adopts upward flow, can avoid suspended substance to concentrate in packing layer, strengthens filler and receives dirty rate, extends back flushing interval time.
Preferably, the described extra large sand filtration bed of material is comprised of extra large sand, selects particle diameter 2-3mm, density 2.54g/cm
3, porosity 2.23%, specific surface area 0.26m
2the extra large sand of/g.
Preferably, the thickness of the described extra large sand filtration bed of material is 1.5-1.7m.
Preferably, described zeolite filler layer is comprised of zeolite, selects particle diameter 8-20mm, density 1.9-2.6g/cm
3, porosity>=48% and specific surface area 570-670m
2the zeolite of/g.Because high-specific surface area and voidage provide the huge space of perching, make a large amount of microorganic adhesion on filler, and at filling surface amount reproduction.
Preferably, the thickness of described zeolite filler layer is 1.4-1.6m.
Preferably, described water distributor is comprised of main-arm-water distributing pore, and the downside of every arm is evenly arranged the isodiametric apertures of pitch-row such as a plurality of.
Preferably, described supporting layer is comprised of pebbles, pebbles particle diameter 2-6cm, density 2.65g/cm
3.
A method of utilizing pre-denitrification biological aerated filter to dispose of sewage, its step is as follows:
(1) sewage containing organism, ammonia nitrogen of need being processed maybe needs sewage and the backflow nitrification liquid containing organism, ammonia nitrogen processed all to inject water distribution buffer zone, the extra large sand filtration bed of material of upwards flowing through, in the sea sand filtration bed of material, denitrifying bacterium utilizes the organic carbon source in water inlet that nitrous acid nitrogen and nitrate nitrogen in phegma are reduced into nitrogen, realize denitrification denitrogenation, meanwhile, the suspended substance in sewage filter material surface and above be trapped within the extra large sand filtration bed of material under the adsorption of microorganism;
(2) sewage of processing through DN pond body is entered the first tank inner core at the first tank body middle part by effluent trough through clear water zone; Sewage is spilled over to tank dashpot from the first tank inner core, and then current flow out through the top of tank dashpot, and overflow water outlet waterfall flow to the first tank water reserve; From the first tank inner core to tank dashpot, then in the process of the first tank water reserve, in water, can dissolve a large amount of airborne oxygen, the first tank inner core of this special construction can be brought up to 2.22mg/L from 0.27 by sewage DO; The moisture of the first tank body is two flow directions: a kind of is backwash water as Prepositive denitrification filter tank (DN pond body), and another kind enters CN pond body and carries out nitrification;
(3) make the sewage of the first tank body through water distributor, be sprayed to buffer layer by intake pump, sewage is through the sprinkling process of water distributor, and DO brings up to 2.74mg/L from 2.22mg/L, opens aeration pump, makes sewage DO in the body of CN pond remain on 1.8-2.7mg/L; Zeolite layer nitrobacteria utilizes ammonia nitrogen and the DO in water to carry out nitration reaction, by mineralized nitrogen, is nitrate nitrogen, nitrous acid nitrogen; Aerobic bacteria utilizes in water the DO residual organic substances of further degrading;
(4) make the body water outlet of CN pond enter the second tank body, part enters DN pond body as backflow nitrification liquid through the first water pump, and part is for CN pond body backwashing water, all the other qualified discharges.
Preferably, also comprise step (5), the filtering layer causing for the propagation of the SS that avoids holding back due to filtering layer and microorganism stops up, and DN pond body and CN pond body carry out back flushing.
Preferably, the back flushing of described DN pond body is spaced apart 7 days, and back flushing adopts water flushing method, time length 4min; Backwashing water intensity is 10L/ (s ﹒ m
2); The back flushing of described CN pond body is spaced apart 14 days, and back flushing adopts gas/water integrated processes, and gas/water is back flushing time length 3min simultaneously; Backwashing water intensity is 8L/ (s ﹒ m
2), gas intensity is 14L/ (s ﹒ m
2).
3. beneficial effect
Compared with prior art, the present invention has following remarkable advantage:
(1) special structure design and the water distributor of device the first tank body of the present invention all increased duration of contact and the area of sewage and air in sprinkling process, especially the first tank body middle part is placed with a first tank inner core, the arranged outside of the first tank inner core has a ring-type tank dashpot, the height of tank dashpot is lower than the height of the first tank inner core, region between the sidewall of the first tank body and the first tank inner core is the first tank water reserve, make like this water inlet dissolved oxygen of CN pond body to bring up to 2.74mg/L from 0.27mg/L, the in the situation that of a small amount of imposed aeration amount, (gas-water ratio 1.8-2.3) just can make CN pond sewage DO remain on 1.8-2.7mg/L,
(2) device and method of the present invention is compared with existing Prepositive denitrification bio-filter and treatment process, the present invention can unpowered raising CN pond water inlet dissolved oxygen, thereby reduce follow-up additional oxygen-supplying amount, there is simple in structure, easy to operate, less energy-consumption;
(3) in device of the present invention, DN pond filter material layer is comprised of extra large sand, the extra large sand of this particle diameter, on the one hand as bio-carrier, for microorganism provides good life carrier, play a part on the other hand filtration, because extra large sand has corrosion-resistant, particle shape rounding, siliceous height, the feature that hardness is strong, can effectively catching suspended substance in water inlet, extend the filtrate time of changing;
(4) CN of the present invention pond filter material layer is comprised of zeolite, because zeolite is to NH
4 +the strong adsorption effect of-N, especially particle diameter 8-20mm, density 1.9-2.6g/cm
3, porosity>=48% and specific surface area 570-670m
2the zeolite of/g, has stronger anti-ammonia nitrogen impact load ability;
(5) method of the present invention can unpowered raising CN pond water inlet dissolved oxygen, thereby reduce follow-up additional oxygen-supplying amount, there is simple in structure, easy to operate, less energy-consumption.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention.
In figure: 1, water distribution buffer zone; 2, supporting layer; 3, the extra large sand filtration bed of material; 4, DN pond body; 5, clear water zone; 6, effluent trough; 7, the first tank inner core; 8, tank dashpot; 9, the first tank water reserve; 10, the first tank body; 11, intake pump; 12, water distributor; 13, buffer layer; 14, zeolite filler layer; 15, CN pond body; 16, cloth gas-bearing formation; 17, the second tank body; 18, the first water pump; 19, the second water pump; 20, aeration pump; 21, DN pond back flushing water shoot; 22, CN pond back flushing water shoot.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described further.
Embodiment 1
As shown in Figure 1, a kind of pre-denitrification biological aerated filter, comprises DN pond body 4 and CN pond body 15, also comprises the first tank body 10, the second tank body 17 and aeration pump 20; Body 4 inside, DN pond comprise clear water zone 5, the extra large sand filtration bed of material 3, supporting layer 2 and water distribution buffer zone 1 from top to bottom successively; Water distribution buffer zone 1 one sides are provided with water-in; One side of clear water zone 5 is also provided with effluent trough 6, between effluent trough 6 and clear water zone 5, by water-stop sheet, separates, and the height of water-stop sheet is lower than the height at body 4 tops, DN pond; One side of clear water zone 5 is also provided with DN pond back flushing water shoot 21; The first tank body 10 middle parts are placed with a first tank inner core 7; The arranged outside of the first tank inner core 7 has a ring-type tank dashpot 8, and the height of tank dashpot 8 is lower than the height of the first tank inner core 7; Region between the sidewall of the first tank body 10 and the first tank inner core 7 is the first tank water reserve 9; Body 15 inside, CN pond comprise water distributor 12, buffer layer 13, zeolite filler layer 14, cloth gas-bearing formation 16 and supporting layer 2 from top to bottom successively, and the sidepiece of buffer layer 13 is connected with a CN pond back flushing water shoot 22; Effluent trough 6 is connected with the first tank inner core 7 by a pipeline; The first tank body 10 is connected with water distributor 12 by pipeline, is also provided with intake pump 11 on this pipeline; The first tank inner core 7 is connected with water distribution buffer zone 1 by a pipeline, and this pipeline is provided with the second water pump 19; The bottom of CN pond body 15 is connected with the second tank body 17; The second tank body 17 is connected with water distribution buffer zone 1 by pipeline, is also provided with the first water pump 18 on this pipeline; Body 15 bottoms, CN pond are connected with aeration pump 20.
The sea sand filtration bed of material 3 is comprised of extra large sand, selects particle diameter 2-3mm, density 2.54g/cm
3, porosity 2.23%, specific surface area 0.26m
2the extra large sand of/g.The thickness of the sea sand filtration bed of material 3 is 1.6m.Zeolite filler layer 14 is comprised of zeolite, selects particle diameter 8-20mm, density 1.9-2.6g/cm
3, porosity>=48% and specific surface area 570-670m
2the zeolite of/g.The thickness of zeolite filler layer 14 is 1.5m.Water distributor 12 is comprised of main-arm-water distributing pore, and the downside of every arm is evenly arranged the isodiametric apertures of pitch-row such as 30.Supporting layer 2 is comprised of pebbles, pebbles particle diameter 2-6cm, density 2.65g/cm
3.
The water (flow) direction of DN pond body 4 adopts upward flow, and hydraulic detention time is 0.3-0.8h; Under the water (flow) direction of described CN pond body 15 adopts, to stream, gas-water ratio is 1.8-2.3, nitrification liquid reflux ratio 110-150%.Concrete working method is as follows:
(1) by the organism that contains of need processing, the sewage of ammonia nitrogen maybe needs the organism that contains of processing, the sewage of ammonia nitrogen and backflow nitrification liquid (after startup for some time, being to need sewage and the backflow nitrification liquid processed all to inject water distribution buffer zone 1) all inject water distribution buffer zone 1, the extra large sand filtration bed of material 3 of upwards flowing through, in the sea sand filtration bed of material 3, denitrifying bacterium utilizes the organic carbon source in water inlet that nitrous acid nitrogen and nitrate nitrogen in phegma are reduced into nitrogen, realize denitrification denitrogenation, simultaneously, suspended substance in sewage (SS) filter material surface and above be trapped within the extra large sand filtration bed of material 3 under the adsorption of microorganism,
(2) sewage of processing through DN pond body 4 is entered the first tank inner core 7 at the first tank body 10 middle parts by effluent trough 6 through clear water zone 5; Sewage is spilled over to tank dashpot 8 from the first tank inner core 7, and then current flow out through the top of tank dashpot 8, and overflow water outlet waterfall flow to the first tank water reserve 9; From the first tank inner core 7 to tank dashpot 8, then in the process of the first tank water reserve 9, in water, can dissolve a large amount of airborne oxygen, the first tank inner core 7 of this special construction can be brought up to 2.22mg/L from 0.27 by sewage DO; The moisture of the first tank body 10 is two flow directions: a kind of is backwash water as Prepositive denitrification filter tank (DN pond body 4), and another kind enters CN pond body 15 and carries out nitrification;
(3) make the sewage of the first tank body through water distributor 12, be sprayed to buffer layer 13 by intake pump 11, sewage is through the sprinkling process of water distributor 12, DO brings up to 2.74mg/L from 2.22mg/L, opens aeration pump 20, and the interior sewage DO of CN pond body 15 is remained between 1.8-2.7mg/L; Zeolite layer nitrobacteria utilizes ammonia nitrogen and the DO in water to carry out nitration reaction, by mineralized nitrogen, is nitrate nitrogen, nitrous acid nitrogen; Aerobic bacteria utilizes in water the DO residual organic substances of further degrading;
(4) make body 15 water outlets of CN pond enter the second tank body 17, part enters DN pond body 4 as backflow nitrification liquid through the first water pump 18, and part is for CN pond body 15 backwashing waters, all the other qualified discharges;
(5) for avoiding the filtering layer that the propagation of the SS that holds back due to filtering layer and microorganism causes to stop up, DN pond body 4 and CN pond body 15 need carry out back flushing.The back flushing of DN pond body 4 is spaced apart 7 days, and back flushing adopts water flushing method, time length 4min; Backwashing water intensity is 10L/ (s ﹒ m
2).The back flushing of CN pond body 15 is spaced apart 14 days, and back flushing adopts gas/water integrated processes, and gas/water is back flushing time length 3min simultaneously; Backwashing water intensity is 8L/ (s ﹒ m
2), gas intensity is 14L/ (s ﹒ m
2).
This process operation condition: influent COD is 220 ± 30mg/L, and TN is 30 ± 10mg/L, the temperature in operational process is 25 ± 8 ℃, the pH value of sewage is 7.5 ± 0.4.
This art breading effect: COD clearance is greater than 85%, effluent quality reaches the requirement that is less than 50mg/L in < < urban wastewater treatment firm pollutant emission standard > > (GB18918-2002) one-level A standard for COD; TN clearance is greater than 78%, and effluent quality reaches the requirement that is less than 15mg/L in < < urban wastewater treatment firm pollutant emission standard > > (GB18918-2002) one-level A standard for TN.
Method of the present invention is because zeolite is to NH
4 +-N has good absorption and ion-exchange capacity, even if it is unstable to intake, ammonia nitrogen loading is brought up in the situation of 40mg/L, and water outlet ammonia nitrogen in CN pond is still stabilized in 6mg/L.
Embodiment 2
With embodiment 1, difference is that the thickness of the extra large sand filtration bed of material 3 is 1.5m; The thickness of zeolite filler layer 14 is 1.6m.
Embodiment 3
With embodiment 1, difference is that the thickness of the extra large sand filtration bed of material 3 is 1.7m; The thickness of zeolite filler layer 14 is 1.4m.
Claims (10)
1. a pre-denitrification biological aerated filter, comprises DN pond body (4) and CN pond body (15), it is characterized in that, also comprises the first tank body (10), the second tank body (17) and aeration pump (20); Described DN pond body (4) inside comprises clear water zone (5), the extra large sand filtration bed of material (3), supporting layer (2) and water distribution buffer zone (1) from top to bottom successively; Described water distribution buffer zone (1) one side is provided with water-in; One side of described clear water zone (5) is also provided with effluent trough (6), between effluent trough (6) and clear water zone (5), by water-stop sheet, separates, and the height of water-stop sheet is lower than the height at DN pond body (4) top; One side of described clear water zone (5) is also provided with DN pond back flushing water shoot (21); The first described tank body (10) middle part is placed with a first tank inner core (7); The arranged outside of the first described tank inner core (7) has a ring-type tank dashpot (8), and the height of tank dashpot (8) is lower than the height of the first tank inner core (7); Region between the sidewall of the first described tank body (10) and the first tank inner core (7) is the first tank water reserve (9); Described CN pond body (15) inside comprises water distributor (12), buffer layer (13), zeolite filler layer (14), cloth gas-bearing formation (16) and supporting layer (2) from top to bottom successively, and the sidepiece of described buffer layer (13) is connected with a CN pond back flushing water shoot (22); Described effluent trough (6) is connected with the first tank inner core (7) by a pipeline; The first described tank body (10) is connected with water distributor (12) by pipeline, is also provided with intake pump (11) on this pipeline; The first described tank inner core (7) is connected with water distribution buffer zone (1) by a pipeline, and this pipeline is provided with the second water pump (19); The bottom of described CN pond body (15) is connected with the second tank body (17); The second described tank body (17) is connected with water distribution buffer zone (1) by pipeline, is also provided with the first water pump (18) on this pipeline; Described CN pond body (15) bottom is connected with aeration pump (20).
2. a kind of pre-denitrification biological aerated filter according to claim 1, is characterized in that, the described extra large sand filtration bed of material (3) is comprised of extra large sand, selects particle diameter 2-3mm, density 2.54g/cm
3, porosity 2.23%, specific surface area 0.26m
2the extra large sand of/g.
3. a kind of pre-denitrification biological aerated filter according to claim 2, is characterized in that, the thickness of the described extra large sand filtration bed of material (3) is 1.5-1.7m.
4. a kind of pre-denitrification biological aerated filter according to claim 1, is characterized in that, described zeolite filler layer (14) is comprised of zeolite, selects particle diameter 8-20mm, density 1.9-2.6g/cm
3, porosity>=48% and specific surface area 570-670m
2the zeolite of/g.
5. a kind of pre-denitrification biological aerated filter according to claim 4, is characterized in that, the thickness of described zeolite filler layer (14) is 1.4-1.6m.
6. according to a kind of pre-denitrification biological aerated filter described in any one in claim 1-5, it is characterized in that, described water distributor (12) is comprised of main-arm-water distributing pore, and the downside of every arm is evenly arranged the isodiametric apertures of pitch-row such as a plurality of.
7. according to a kind of pre-denitrification biological aerated filter described in any one in claim 1-5, it is characterized in that, described supporting layer (2) is comprised of pebbles, pebbles particle diameter 2-6cm, density 2.65g/cm
3.
8. a method of utilizing pre-denitrification biological aerated filter to dispose of sewage, its step is as follows:
(1) sewage containing organism, ammonia nitrogen of need being processed maybe needs sewage and the backflow nitrification liquid containing organism, ammonia nitrogen processed all to inject water distribution buffer zone (1), the extra large sand filtration bed of material (3) of upwards flowing through, in the sea sand filtration bed of material (3), denitrifying bacterium utilizes the organic carbon source in water inlet that nitrous acid nitrogen and nitrate nitrogen in phegma are reduced into nitrogen, realize denitrification denitrogenation, meanwhile, the suspended substance in sewage filter material surface and above be trapped within the extra large sand filtration bed of material (3) under the adsorption of microorganism;
(2) sewage of processing through DN pond body (4) is entered the first tank inner core (7) at the first tank body (10) middle part by effluent trough (6) through clear water zone (5); Sewage is spilled over to tank dashpot (8) from the first tank inner core (7), and then current flow out through the top of tank dashpot (8), and overflow water outlet waterfall flow to the first tank water reserve (9); The moisture of the first tank body (10) is two flow directions: a kind of is backwash water as Prepositive denitrification filter tank, and another kind enters CN pond body (15) and carries out nitrification;
(3) make the sewage of the first tank body through water distributor (12), be sprayed to buffer layer (13) by intake pump (11), open aeration pump (20), make the interior sewage DO of CN pond body (15) remain on 1.8-2.7mg/L; Zeolite layer nitrobacteria utilizes ammonia nitrogen and the DO in water to carry out nitration reaction, by mineralized nitrogen, is nitrate nitrogen, nitrous acid nitrogen; Aerobic bacteria utilizes in water the DO residual organic substances of further degrading;
(4) make body 15 water outlets of CN pond enter the second tank body (17), part enters DN pond body (4) as backflow nitrification liquid through the first water pump (18), and part is for CN pond body (15) backwashing water, all the other qualified discharges.
9. a kind of method of utilizing pre-denitrification biological aerated filter to dispose of sewage according to claim 8, is characterized in that, also comprises step (5), and DN pond body (4) and CN pond body (15) carry out back flushing.
10. a kind of method of utilizing pre-denitrification biological aerated filter to dispose of sewage according to claim 9, is characterized in that, the back flushing of described DN pond body (4) is spaced apart 7 days, and back flushing adopts water flushing method, time length 4min; Backwashing water intensity is 10L/ (s ﹒ m
2); The back flushing of described CN pond body (15) is spaced apart 14 days, and back flushing adopts gas/water integrated processes, and gas/water is back flushing time length 3min simultaneously; Backwashing water intensity is 8L/ (s ﹒ m
2), gas intensity is 14L/ (s ﹒ m
2).
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