CN103043786B - Slow carbon source releasing media filter device and process with deep denitrification function - Google Patents
Slow carbon source releasing media filter device and process with deep denitrification function Download PDFInfo
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- CN103043786B CN103043786B CN201210555619.XA CN201210555619A CN103043786B CN 103043786 B CN103043786 B CN 103043786B CN 201210555619 A CN201210555619 A CN 201210555619A CN 103043786 B CN103043786 B CN 103043786B
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Abstract
The invention relates to a slow carbon source releasing media filter device and process with a deep denitrification function. According to the invention, secondary effluent is lifted to a water trough through a pump; when water is inflowing, an intake gate is opened, a back-flush discharging valve is closed, and the secondary effluent enters the main body of the media filter; the inflow water passes through a slow carbon source releasing filtering layer, a quartz sand filtering layer and a supporting layer, then enters a water and gas distribution chamber, and is discharged by a water contributing pipe; the filtering velocity of the filtration is controlled by a water contributing electric adjustment valve installed on the water contributing pipe; and when the water contributing electric adjustment valve is opened to the maximum degree, or a pressure sensor installed at the front end of the water contributing electric adjustment valve reaches the set value, a back-wash procedure is started. And according to the invention, denitrification reaction is carried out through an organic matter released adaptively by biodegradable polymer particle filtering materials under the effect of microorganism, so that deep denitrification is realized, and the defect that an organic matter remains in water due to addition of a liquid carbon source in the traditional process is overcome.
Description
Technical field
The present invention relates to a kind of town sewage advanced treatment process and device, particularly a kind of slowly-releasing carbon source filter material filter pool device and technique with advanced nitrogen function.
Background technology
Polluted by nitrogen is one of important factor causing body eutrophication, and town sewage is the main source of nitrogen pollutant, serious threat ecological safety and human health.In recent years, country improves constantly the standard of town sewage discharge, some are economically developed, the area that environmental capacity is little proposes more strict requirement, (COD < 20mg/L as the strictest in the A grade standard of Beijing provincial standard, TN < 10mg/L, TP < 0.2mg/L, SS < 5mg/L).Because China municipal effluent C/N is generally lower, denitrifying carbon source is not enough, and therefore according to the requirement of new standard qualified discharge, TN removes comparatively difficulty.
At present, general treatment technology is after second-stage treatment, to increase advanced treatment unit, and advanced treatment section is by denitrification filter pool, BAF, and the unit such as V-type filter tank and ozonization form.In denitrification filter pool water inlet, add the fluid organic materials such as methyl alcohol, acetate as the carbon source material of denitrification process.The denitrification filter pool that adds liquid carbon source needs more equipment and the complicated Controlling System that adds, and to avoid organism to add the COD that the excessive waste causing and outlet water organic substance excess residual cause, exceeds standard.And when organism adds deficiency, because denitrification is incomplete, the virose nitrite of tool is a large amount of problems that exist in water outlet.Therefore traditional technology need to be set up BAF after denitrification filter pool again, guarantees that COD is up to standard and avoids existing in water outlet nitrite.The shortcomings such as in sum, traditional technology has long flow path, and equipment is many, controls difficulty, and medicament utilising efficiency is low.
Develop possess denitrogenation simultaneously, dephosphorization, removal suspended substance function, and can there is important using value by advanced treatment process device up to standard without subsequent disposal outlet water organic substance.
Summary of the invention
In order to overcome the defect of above-mentioned prior art, the object of the present invention is to provide a kind of slowly-releasing carbon source filter material filter pool device and technique with advanced nitrogen function, realize high quality discharge and regeneration that town sewage is processed, realize the removal to TN, TP and SS simultaneously.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of slowly-releasing carbon source filter material filter pool device with advanced nitrogen function, comprise filter tank main body 1, secondary effluent is connected with the inlet flume 15 of filter tank main body 1 by the intake pump 2 on suction culvert, on suction culvert, also by coagulant dosage pump 3, connect coagulating agent chemical tank 7, inlet flume 15 is communicated to the filtering bodies in filter tank main body 1 by inlet gate 17, filtering bodies is followed successively by slowly-releasing carbon source filtering layer 11 from top to down, quartz sand filtering layer 10 and supporting layer 9, supporting layer 9 bottoms are provided with strainer head 12, strainer head 12 bottoms are water and air distributing chamber 8, water and air distributing chamber 8 is connected with outside clean water basin by backwash pump 4, water and air distributing chamber 8 is communicated with back flushing gas blower 5, water and air distributing chamber 8 is connected with outside water producing pipe by producing water motor-driven control valve 6, in filter tank main body 1, be also provided with V-type groove 13, V-type groove 13 is connected with back flushing drainage tray 14 by back flushing emptying gate 16.
A kind of slowly-releasing carbon source filter material filter pool technique with advanced nitrogen function based on said apparatus, comprises the following steps:
Step 1, secondary effluent are promoted to inlet flume 15 through intake pump 2, during water inlet, inlet gate 17 is opened, back flushing emptying gate 16 is closed, secondary effluent is in inlet gate 17 enters filter tank main body 1, and water inlet, from top to down successively through slowly-releasing carbon source filtering layer 11, quartz sand filtering layer 10, supporting layer 9, enters water and air distributing chamber 8 after strainer head 12 is collected, by water producing pipe, discharged, the filtering velocity of filtration is controlled by the product water motor-driven control valve 6 being arranged on water producing pipe again;
Step 2, when producing the aperture of water motor-driven control valve 6, open to maximum or when the pressure transmitter of its front end setting reaches set(ting)value, start backwashing procedures:
(1) close inlet gate 17, open back flushing emptying gate 16, pool inner water is disposed to outside filter tank through back flushing drainage tray;
(2) open again the precipitation position valve of filter tank main body 1, then by pond higher than the water of the precipitation position pipeline of filter tank main body 1 beyond precipitation position pipeline is discharged to filter tank;
(3), after precipitation position completes, close the precipitation position valve of filter tank main body 1;
(4) start the backwash pump 4 being connected with water distribution distributing water room, adopt high strength water to rinse, 12～15L/(m
2s), last 30s;
(5) restart the back flushing gas blower 5 being connected with water and air distributing chamber, intensity is 15～20L/(m
2s), air water is combined recoil and is lasted 60～90s, backwashing water and backwash gas enter water and air distributing chamber 8, through strainer head 12, enter filter tank main body 1, rinse from bottom to top filtering layer, backwashing water rises and to collect through V-type groove 13, by the back flushing emptying gate 16 of opening, enters back flushing drainage tray 14, then through row of conduits to filter tank;
(6) close backwash pump 4 and back flushing gas blower 5, last 1min;
(7) start backwash pump 4, with 4～8L/(m
2s) intensity back flushing 3min;
(8) close backwash pump, close back flushing emptying gate 14;
(9) open inlet gate 17, open and regulate the aperture of producing water motor-driven control valve 6, recover to filter.
Slowly-releasing carbon source filtrate adopts biodegradable polymkeric substance as raw material, and extrusion moulding is prepared into the particle that particle diameter is 3.0-4.0mm.Raw material can adopt the material of the energy microbiological deteriorations such as the blend of polycaprolactone (PCL), polyhydroxyalkanoate (PHAs), PCL and PHAs and starch.
At secondary effluent during through slowly-releasing carbon source filter material layer, nitric nitrogen be take the organic carbon that slowly-releasing carbon source provides in filtering layer under microbial process be electron donor, carries out anti-nitration reaction, is converted into nitrogen and then removes from water.Its ultimate principle is: the hole that utilizes upper strata macrobead filtrate to form is held back into large particle diameter suspended substance and microorganism in water, can reduce the obstruction of lower floor's filtrate, the microorganism in water inlet of simultaneously usining forms denitrifying bacteria microbial film as inoculum at upper strata filter material surface.Upper strata filtering material particle discharges organic carbon under the lytic enzyme effect of attached microbial, for denitrification process provides carbon source.Nitric nitrogen in water inlet is act as electron acceptor(EA) by denitrifying bacteria when flowing through upper strata filtrate, and the organic carbon that the slowly-releasing carbon source filtrate of take discharges is simultaneously electron donor, carries out nitrate respiration metabolism, nitric nitrogen is converted into nitrogen, realizationization denitrogenation.The release of organic carbon is relevant to the nitrate respiration metabolism of denitrifying bacteria, and therefore organic hydrolysis is subject to the control of nitrate in water, thereby has avoided organic excess residual in water outlet.TP in water inlet forms small flco after contacting with coagulating agent (aluminium salt or molysite), with water inlet in other suspended substances, first through the primary filter of the slowly-releasing carbon source filtrate of 3～4mm, the water environment capacity that utilizes macrovoid to form, holds back the suspended substance of large particle diameter.Compared with the suspended substance of small particle size, in lower floor's quartz sand filter media, held back, thereby guaranteed effluent quality.
Technical characterictic of the present invention is: 1) by the biodegradable polymers granule filter material organism that self-adaptation discharges under microbial process, carry out anti-nitration reaction, realize advanced nitrogen, overcome traditional technology simultaneously and added the shortcoming that liquid carbon source causes organic substance residues in water; 2) utilize the density difference of filtrate material, adopt double-layer filter material structure formation, at a structure unit, realize the removal of denitrogenation, dephosphorization and suspended substance.3) intensity adjustable rinses scheme, reduces wash water amount, prevents the loss of upper strata light filter material.Compare with the setting separated with sand filter of haydite filter tank in traditional technology, have this technique have take up an area little, equipment is few, control is simple, initial cost is low, the advantage that effluent quality is good.
The invention has the beneficial effects as follows: single structures have the function of removing TN, TP, SS simultaneously, when second-stage treatment effect is better, can guarantee the stably reaching standard of water outlet COD.Have technique simple, floor space is little, operational outfit is few, safeguard that control is easy, initial cost is low, the advantage that effluent quality is good.
Accompanying drawing explanation
Fig. 1 is device schematic diagram of the present invention.
Fig. 2 is slowly-releasing carbon source filter material filter pool orthographic plan in the present invention.
Fig. 3 is slowly-releasing carbon source filter material filter pool sectional view in the present invention, and wherein Fig. 3-1 is the sectional view of Fig. 2 A-A, and wherein Fig. 3-2 are the sectional view of Fig. 2 B-B.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
With reference to Fig. 1-Fig. 3, a kind of slowly-releasing carbon source filter material filter pool device with advanced nitrogen function, comprise filter tank main body 1, secondary effluent is connected with the inlet flume 15 of filter tank main body 1 by the intake pump 2 on suction culvert, on suction culvert, also by coagulant dosage pump 3, connect coagulating agent chemical tank 7, inlet flume 15 is communicated to the filtering bodies in filter tank main body 1 by inlet gate 17, filtering bodies is followed successively by slowly-releasing carbon source filtering layer 11 from top to down, quartz sand filtering layer 10 and supporting layer 9, supporting layer 9 bottoms are provided with strainer head 12, strainer head 12 bottoms are water and air distributing chamber 8, water and air distributing chamber 8 is connected with outside clean water basin by backwash pump 4, water and air distributing chamber 8 is communicated with back flushing gas blower 5, water and air distributing chamber 8 is connected with outside water producing pipe by producing water motor-driven control valve 6, in filter tank main body 1, be also provided with V-type groove 13, V-type groove 13 is connected with back flushing drainage tray 14 by back flushing emptying gate 16.
Embodiment mono-
The present embodiment slowly-releasing carbon source used filter material filter pool main body 1 planar dimension is 7m * 8m, the high 800mm in water and air distributing chamber 8, the thick 100mm of filter plate; Supporting layer 9 adopts 3～5mm gravel, thick 200mm, and quartz sand filter media layer 10 adopts quartz sand particle size 0.5～0.8mm, thick 500mm; Slowly-releasing carbon source filtering layer 11 filtrates adopt the PCL that particle diameter is 3～4mm, thick 1200mm; It is 300mm on filter material layer that elevation of water surface falls in back flushing; Filtering operation liquid level is the above 1500mm in backwash precipitation position; Superelevation 300mm.
NO in water inlet
3--N=35mg/L, SS=12mg/L, flooding quantity is 170m
3/ h, inflow temperature is 25 ℃.
The present embodiment comprises the following steps:
Step 1, second pond water outlet is in intake pump is promoted to filter tank inlet flume, and coagulant dosage pump is added to PAC solution in the water inlet pipe after intake pump simultaneously, and fully mixes by line mixer.Inlet gate in filter tank is opened, back flushing closing gate.Water in inlet flume enters in filter tank through inlet gate, permeate from top to down through the slowly-releasing carbon source filter material layer on upper strata and the quartz sand filter media layer of lower floor, in upper strata, the suspended substance of the large particle diameter of a part in water is held back by slowly-releasing carbon source filtrate, deliquescent nitrate nitrogen contaminants is under microbial process, the organic carbon that the slowly-releasing carbon source filtrate of take discharges under microbial hydrolytic effect is electron donor, is reduced, and is converted into nitrogen.Nitrogen is upward through filtering layer and discharges into the atmosphere.
Step 2, continues process quartz sand filtration layer downwards through denitrogenation and the preliminary water filtering, and more short grained suspended substance is further filtered and holds back, and realizes the up to standard of water outlet.
Step 3, when producing the aperture of water motor-driven control valve 6, open to maximum or when the pressure transmitter of its front end setting reaches set(ting)value, start backwashing procedures.Backwash process: 1) close inlet gate 17, open back flushing emptying gate 16, pool inner water is disposed to outside filter tank through back flushing drainage tray; 2) open again precipitation position valve, then by pond higher than the water of precipitation position pipeline beyond precipitation position pipeline is discharged to filter tank; 3), after precipitation position completes, close precipitation position valve; 4) start the backwash pump 4 being connected with water distribution distributing water room, adopt high strength water to rinse, 12～15L/(m2s), last 30s; 5) restart the back flushing gas blower 5 being connected with water and air distributing chamber, intensity is 15～20L/(m
2s), air water is combined recoil and is lasted 60～90s; 6) close backwash pump 4 and back flushing gas blower 5, last 1min; 7) start backwash pump 4, with 4～8L/(m
2s) intensity back flushing 3min; 8) close backwash pump, close back flushing emptying gate 14; 9) open inlet gate 17, open and regulate the aperture of producing water motor-driven control valve 6, recover to filter.
The technical scheme that adopts the present embodiment, effect is as follows: TN clearance is more than 96%.Water outlet SS < 4mg/L.Denitrification volumetric loading maximum can reach 2.0kgN/(m
3d), water outlet COD increasing amount is less than 10mg/L.
Embodiment bis-
The present embodiment slowly-releasing carbon source used filter material filter pool main body 1 planar dimension is 7m * 8m, the high 800mm in water and air distributing chamber 8, the thick 100mm of filter plate; Supporting layer 9 adopts 3～5mm gravel, thick 200mm, and quartz sand filter media layer 10 adopts quartz sand particle size 0.5～0.8mm, thick 500mm; Slowly-releasing carbon source filtering layer 11 filtrates adopt the PCL that particle diameter is 3～4mm, thick 1200mm; It is 300mm on filter material layer that elevation of water surface falls in back flushing; Filtering operation liquid level is the above 1500mm in backwash precipitation position; Superelevation 300mm.
NO in water inlet
3 --N=15mg/L, SS=12mg/L, flooding quantity is 280m
3/ h, inflow temperature is 25 ℃.
The present embodiment comprises the following steps:
Step 1, second pond water outlet is in intake pump is promoted to filter tank inlet flume, and coagulant dosage pump is added to PAC solution in the water inlet pipe after intake pump simultaneously, and fully mixes by line mixer.Inlet gate in filter tank is opened, back flushing closing gate.Water in inlet flume enters in filter tank through inlet gate, permeate from top to down through the slowly-releasing carbon source filter material layer on upper strata and the quartz sand filter media layer of lower floor, in upper strata, the suspended substance of the large particle diameter of a part in water is held back by slowly-releasing carbon source filtrate, deliquescent nitrate nitrogen contaminants is under microbial process, the organic carbon that the slowly-releasing carbon source filtrate of take discharges under microbial hydrolytic effect is electron donor, is reduced, and is converted into nitrogen.Nitrogen is upward through filtering layer and discharges into the atmosphere.
Step 2, continues process quartz sand filtration layer downwards through denitrogenation and the preliminary water filtering, and more short grained suspended substance is further filtered and holds back, and realizes the up to standard of water outlet.
Step 3, when producing the aperture of water motor-driven control valve 6, open to maximum or when the pressure transmitter of its front end setting reaches set(ting)value, start backwashing procedures.Backwash process: 1) close inlet gate 17, open back flushing emptying gate 16, pool inner water is disposed to outside filter tank through back flushing drainage tray; 2) open again precipitation position valve, then by pond higher than the water of precipitation position pipeline beyond precipitation position pipeline is discharged to filter tank; 3), after precipitation position completes, close precipitation position valve; 4) start the backwash pump 4 being connected with water distribution distributing water room, adopt high strength water to rinse, 12～15L/(m2s), last 30s; 5) restart the back flushing gas blower 5 being connected with water and air distributing chamber, intensity is 15～20L/(m
2s), air water is combined recoil and is lasted 60～90s; 6) close backwash pump 4 and back flushing gas blower 5, last 1min; 7) start backwash pump 4, with 4～8L/(m
2s) intensity back flushing 3min; 8) close backwash pump, close back flushing emptying gate 14; 9) open inlet gate 17, open and regulate the aperture of producing water motor-driven control valve 6, recover to filter.
The technical scheme that adopts the present embodiment, effect is as follows: TN clearance is more than 96%.Water outlet SS < 4mg/L.Denitrification volumetric loading maximum can reach 1.5kgN/(m
3d), water outlet COD increasing amount is less than 10mg/L.
Embodiment tri-
The present embodiment slowly-releasing carbon source used filter material filter pool main body 1 is of a size of diameter 100mm, the high 200mm in water and air distributing chamber, the thick 10mm of filter plate; Quartz sand filter media layer adopts quartz sand particle size 0.5～0.8mm, thick 200mm; Slowly-releasing carbon source filtrate adopts the PCL that particle diameter is 3～4mm, thick 1200mm; Filtering operation liquid level is the above 1500mm in backwash precipitation position; Superelevation 300mm.
NO in water inlet
3 --N=35mg/L, SS=12mg/L, flooding quantity is 24L/h, inflow temperature is 20 ℃.
The present embodiment comprises the following steps:
Step 1, second pond water outlet is in intake pump is promoted to filter tank inlet flume, and coagulant dosage pump is added to PAC solution in the water inlet pipe after intake pump simultaneously, and fully mixes by line mixer.Inlet valve in filter tank is opened, and back flush valves is closed.Water in inlet flume enters in filter tank through inlet valve, permeate from top to down through the slowly-releasing carbon source filter material layer on upper strata and the quartz sand filter media layer of lower floor, in upper strata, the suspended substance of the large particle diameter of a part in water is held back by slowly-releasing carbon source filtrate, deliquescent nitrate nitrogen contaminants is under microbial process, the organic carbon that the slowly-releasing carbon source filtrate of take discharges under microbial hydrolytic effect is electron donor, is reduced, and is converted into nitrogen.Nitrogen is upward through filtering layer and discharges into the atmosphere.
Step 2, continues process quartz sand filtration layer downwards through denitrogenation and the preliminary water filtering, and more short grained suspended substance is further filtered and holds back, and realizes the up to standard of water outlet.
Step 3, when producing the aperture of water motor-driven control valve 6, open to maximum or when the pressure transmitter of its front end setting reaches set(ting)value, start backwashing procedures.Backwash process: 1) close inlet valve, open back flushing water discharging valve, pool inner water is disposed to outside filter tank through back flushing drainage tray; 2) open again precipitation position valve, then by pond higher than the water of precipitation position pipeline beyond precipitation position pipeline is discharged to filter tank; 3), after precipitation position completes, close precipitation position valve; 4) start the backwash pump being connected with water distribution distributing water room, adopt high strength water to rinse, 12～15L/(m2s), last 30s; 5) restart the back flushing gas blower 5 being connected with water and air distributing chamber, intensity is 15～20L/(m
2s), air water is combined recoil and is lasted 60～90s; 6) close backwash pump 4 and back flushing gas blower 5, last 1min; 7) start backwash pump, with 4～8L/(m
2s) intensity back flushing 3min; 8) close backwash pump, close back flushing water discharging valve 14; 9) open inlet gate 17, open and regulate the aperture of producing water motor-driven control valve 6, recover to filter.
The technical scheme that adopts the present embodiment, effect is as follows: TN clearance is more than 96%.Water outlet SS < 4mg/L.Denitrification volumetric loading maximum can reach 2.0kgN/(m
3d), water outlet COD increasing amount is less than 10mg/L.
Claims (2)
1. a slowly-releasing carbon source filter material filter pool device with advanced nitrogen function, it is characterized in that, comprise filter tank main body (1), secondary effluent is connected with the inlet flume (15) of filter tank main body (1) by the intake pump on suction culvert (2), on suction culvert, also by coagulant dosage pump (3), connect coagulating agent chemical tank (7), inlet flume (15) is communicated to the filtering bodies in filter tank main body (1) by inlet gate (17), filtering bodies is followed successively by slowly-releasing carbon source filtering layer (11) from top to down, quartz sand filtering layer (10) and supporting layer (9), supporting layer (9) bottom is provided with strainer head (12), strainer head (12) bottom is water and air distributing chamber (8), water and air distributing chamber (8) is connected with outside clean water basin by backwash pump (4), water and air distributing chamber (8) is communicated with back flushing gas blower (5), water and air distributing chamber (8) is connected with outside water producing pipe by producing water motor-driven control valve (6), in filter tank main body (1), be also provided with V-type groove (13), V-type groove (13) is connected with back flushing drainage tray (14) by back flushing emptying gate (16),
The slowly-releasing carbon source filtrate of slowly-releasing carbon source filtering layer (11) adopt can biodegradable polymkeric substance as raw material, extrusion moulding, be prepared into the particle that particle diameter is 3.0-4.0mm, raw material adopts the material of the blend energy microbiological deterioration of polycaprolactone (PCL), polyhydroxyalkanoate (PHAs), PCL and PHAs and starch.
2. a kind of slowly-releasing carbon source filter material filter pool technique with advanced nitrogen function based on device claimed in claim 1, is characterized in that, comprises the following steps:
Step 1, secondary effluent are promoted to inlet flume (15) through intake pump (2), during water inlet, inlet gate (17) is opened, back flushing emptying gate (16) is closed, secondary effluent is in inlet gate (17) enters filter tank main body (1), water inlet is from top to down successively through slowly-releasing carbon source filtering layer (11), quartz sand filtering layer (10), supporting layer (9), after collecting, strainer head (12) enters water and air distributing chamber (8), by water producing pipe, discharged, the filtering velocity of filtration is controlled by the product water motor-driven control valve (6) being arranged on water producing pipe again;
Step 2, when producing the aperture of water motor-driven control valve (6), open to maximum or when the pressure transmitter of its front end setting reaches set(ting)value, start backwashing procedures:
(1) close inlet gate (17), open back flushing emptying gate (16), pool inner water is disposed to outside filter tank through back flushing drainage tray;
(2) open again the precipitation position valve of filter tank main body (1), then by pond higher than the water of precipitation position pipeline beyond the precipitation position of filter tank main body (1) pipeline is discharged to filter tank;
(3), after precipitation position completes, close the precipitation position valve of filter tank main body (1);
(4) start the backwash pump (4) being connected with water distribution distributing water room, adopt high strength water to rinse, 12～15L/(m
2s), last 30s;
(5) restart the back flushing gas blower (5) being connected with water and air distributing chamber, intensity is 15～20L/(m
2s), air water is combined recoil and is lasted 60～90s, backwashing water and backwash gas enter water and air distributing chamber (8), through strainer head (12), enter filter tank main body (1), rinse from bottom to top filtering layer, backwashing water rises and to collect through V-type groove (13), by the back flushing emptying gate (16) of opening, enters back flushing drainage tray (14), then through row of conduits to filter tank;
(6) close backwash pump (4) and back flushing gas blower (5), last 1min;
(7) start backwash pump (4), with 4～8L/(m
2s) intensity back flushing 3min;
(8) close backwash pump, close back flushing emptying gate (14);
(9) open inlet gate (17), open and regulate the aperture of producing water motor-driven control valve (6), recover to filter.
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