CN101708891B - Aerated biological activated carbon filters and method of applying same to purify feed water - Google Patents

Aerated biological activated carbon filters and method of applying same to purify feed water Download PDF

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CN101708891B
CN101708891B CN2009101935640A CN200910193564A CN101708891B CN 101708891 B CN101708891 B CN 101708891B CN 2009101935640 A CN2009101935640 A CN 2009101935640A CN 200910193564 A CN200910193564 A CN 200910193564A CN 101708891 B CN101708891 B CN 101708891B
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water
filter
activated carbon
flushing
aeration
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CN101708891A (en
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陆少鸣
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South China University of Technology SCUT
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South China University of Technology SCUT
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The invention discloses aerated biological activated carbon filters and a method of applying the same to purify feed water. Each up-flow aerated biological activated carbon filter comprises a water inlet tube, water and air distribution troughs, water and air distribution zones, a filter plate, a single-hole membrane aerated filter head, a coarse sand cushion and dual-layer granular activated carbon filters. The aeration system of the single-hole membrane aerated filter head is adopted for filter aeration. The mode of washing combining air and water is adopted for washing the filter. During washing, a perforated air distribution tube arranged in the water and air distribution zone at the bottom of the filter is adopted to blast air to the filter and aerate the filter, so that the filter washing water is drained from a blow-down tube at the bottom of the filter from top to bottom. The water flowing out of a sedimentation tank is distributed by a water distribution channel, then flows through the coarse sand cushion and the dual-layer granular activated carbon filters of the filter from bottom to top and is intercepted, filtered, absorbed and biologically degraded by the activated carbon filters and the micro-organisms attached to the activated carbon filters to remove the contaminants in the water. The filters have high purification efficiency of contaminants, good washing effect and low cost, save energy and are suitable for biological feed water treatment of micro-polluted water.

Description

Aerated biological activated carbon filter tank and use the method for its polished feedwater
Technical field
The present invention relates to water treatment field, specifically relate to handle the aerated biological activated carbon filter tank of micro-polluted water.
Background technology
At suffering ammonia nitrogen and organism micro polluted source, what often adopt both at home and abroad at present is the feedwater biologic treating technique.Biological treatment is to remove ammonia nitrogen and organic effective and most economical method.The concentration of pollutents such as the organic substrate in the micro-polluted water, ammonia nitrogen and nitrite nitrogen all is very low in sewage.Biomembrance process is generally all used in the micro-polluted water biological treatment, various biological treatments often select for use different inert media (as quartz sand, haydite, granular carbon, plastic honeycomb tube packing and elastic solid filler etc.) as bio-carrier, under the sufficient condition of oxygen in water, nitrite acidizing bacterium and nitrification bacterium on the microbial film change into nitrite and nitrate with ammonia nitrogen in the water.Meanwhile, the organic substrate in some the heterotroph microbiological oxidation water of decomposition on the microbial film reduces organism overall target CODMn, the TOC of water and UV254.
Feedwater is carried out a biological disposal upon required aeration rate much smaller than sewage disposal, must select the very little aeration head of aeration rate, could pass through reasonably to arrange, whole filtering surface in the filter tank is realized uniform aeration, the single hole film is the aeration head that present aeration rate is minimum and can not stop up, so the general fenestra aeration tube aerating system that places supporting layer that adopts of BAF aerating system.Adopt the fenestra aeration tube can under the situation of little gas-water ratio, realize uniform aeration as the aerating system in filter tank, oxygen-transfer efficiency height, the difficult obstruction, can also utilize the film pipe wash tub pipe periodic flushing fenestra aeration tube in filter tank, can prevent effectively that aeration head from stopping up.But consider and treat to contain in the drainage a large amount of inorganic silt particles, mainly be with at supporting layer one,, very likely cause single hole film aeration tube to stop up if the cleaning performance of aeration tube water rinse-system is not good by cut-off filter; And to the cleaning of fenestra aeration tube or the filtrate in the replacing needs taking-up filter tank, cost of overhaul height.The strainer head air distribution hole adopts after the simple pit, substantially the function that has possessed little gas-water ratio uniform aeration, if the single hole film take place to stop up and need clean or change, the maintainer only needs to enter the filter tank by water and air distributing district manhole at the bottom of the pond and overhauls and get final product, and is simple to operate.
BAF is carried out along with filtering, and SS constantly accumulates in the packing layer, and water head loss by filtration progressively strengthens.Especially the nitrifier microbial film of filter material surface is subjected to the covering of inertia SS, influences nitrated to ammonia nitrogen gradually.So need regularly carry out back flushing,, recover the processing power in filter tank to remove the SS of cut-off filter in the filter bed.Because the BAF filtrate is thick, particle diameter is big, can only realize the microdilatancy back flushing, and therefore, backwash mode generally adopts combined water and air backwash, and wash-down water flows to from bottom to top.Yet, when BAF is flow lifting type, in the drainage inertia deposition mainly by cut-off filter in supporting layer and lower floor's filtrate, when the filter tank adopts wash-down water backwashing manner from bottom to top to wash, because the cut-off filter effect of filtrate, often can only take the filter tank out of being arranged in upper strata filtrate inertia deposition, and the inertia deposition that is arranged in lower floor's filtrate still rests on filtering layer, carry out along with filtering, the inertia deposition that is arranged in lower floor's filtrate is cumulative, filtering cloth head progressively increases, and is difficult to recover.And the backwashing manner (essence is the backwashing manner of snare drum wind aeration limit draining) that adopts wash-down water to walk from top to down, can effectively remove the inertia deposition that is accumulated in lower floor's filtrate, and the pond base fabric is put the perforation gas-distribution pipe and is carried out blast aeration and can disturb the deposition that is arranged in water and air distributing district at the bottom of the pond, open emptying valve at the bottom of the pond simultaneously, then can effectively remove the inertia deposition that is positioned at the bottom of the pond, simple to operate.In view of the essence of filter back washing is exactly the reverse cleaning of wash-down water and filtered water filter tank, to get rid of and be accumulated in inertia deposition in the filtering layer, the BAF of flow lifting type adopts the wash-down water backwashing manner that walks from top to down more reasonable.
Summary of the invention
The objective of the invention is to overcome the deficiency that existing flow lifting type aerated biological activated carbon filter tank exists, provide and handle the aerated biological activated carbon filter tank that drainage is treated in little pollution of containing pollutents such as ammonia nitrogen and organic pollutant.
A kind of aerated biological activated carbon filter tank, comprise two filter tanks, comprise two flow lifting type aerated biological activated carbon filter tanks, symmetry is positioned at the canal for water distribution both sides respectively, canal for water distribution is positioned at the piping lane top of settling pipeline, described canal for water distribution comprises total inlet channel, first distributing flue and second distributing flue, total inlet channel is communicated with first distributing flue of its both sides respectively by inlet gate, two first distributing flues are communicated with second distributing flue in its outside respectively, and two join second water channel is communicated with by the water and air distributing trough that is positioned at the piping lane lower end of water inlet pipe with two flow lifting type aerated biological activated carbon filter tanks respectively; Aeration tube one end is communicated with the water and air distributing trough in filter tank, and the other end is connected with the aeration main, and the aeration main is connected with aeration blower;
Be provided with single hole film aeration filter head, filter plate, coarse sand bed course and double-deck granulated active carbon filtrate in the pond body in described flow lifting type aerated biological activated carbon filter tank from top to bottom successively; Single hole film aeration filter head is installed in the filter plate; Be provided with effluent trough in the outside, pond body upper end, effluent trough is connected with the pond body by grid type cowling panel; Water and air distributing trough is communicated with body lower end, pond; Coarse sand supporting layer particle diameter is in 2.5~5mm scope, and thickness is in 0.15~0.2m scope; Upper strata granulated active carbon particle diameter of filter medium is in 1.5~2.0mm scope, and thickness is in 1.0~2.0m scope; Lower floor's granulated active carbon particle diameter of filter medium is in 2.0~2.5mm scope, and filtrate thickness is in 0.5~1.0m scope;
Described aerated biological activated carbon filter tank also is provided with concentrated air water and unites rinse-system down, comprises gas flushing main, gas flushing arm, gas flushing perforation gas-distribution pipe, water flushing main, water flushing arm, wash-water pump and flushing gas blower; The rising pipe of described wash-water pump is connected with water flushing main; Described flushing gas blower is connected with the gas flushing main; The gas flushing main dashes a pipe coupling with two gas respectively, and gas is connected with the perforation gas-distribution pipe towards arm, and the perforation gas-distribution pipe passes water and air distributing trough and is arranged in water and air distributing district, bottom, filter tank; Water flushing main props up pipe coupling with the flushing of two water respectively, and water flushing arm is connected with two water and air distributing troughs.
For further realizing the object of the invention, the described water inlet pipe that is communicated with second distributing flue and water and air distributing trough is provided with into water butterfly valve; Described aeration tube is provided with the aerating regulation butterfly valve; Blow-down pipe is provided with the draining butterfly valve at the bottom of the described pond.
Described water is provided with flushing water inlet butterfly valve towards arm; Described gas flushing arm is provided with the flushing air inlet disk valve.
Use the method for aerated biological activated carbon filter tank polished feedwater: before the common process coagulating sedimentation that is applied to the feed water sand filtration afterwards, treat that drainage enters two first distributing flues respectively from the inlet gate of total inlet channel, overflow enters distributing flue, enter aerated biological activated carbon filter tank water and air distributing trough by water inlet pipe, allocate into then in the body of filter tank and flow filtering velocity 8~16m/h to last; Enter the air distribution and water distribution groove in filter tank through aerated conduit from the pressurized air of aeration blower, allocate into then in the second filter tank body, below filter plate, form air cushion layer, fenestra by single hole film aeration filter head enters the filter handle, again with treat drainage upper reaches aeration in the same way, gas-water ratio 0~0.8: 1, for the microbial film of growing on coarse sand bed course and the carbon leaching material provides sufficient dissolved oxygen and disturbance mass transfer; Under biomembrane biochemistry and charcoal absorption effect, remove ammonia nitrogen, organism and part heavy metal in the water, the water after the purification enters effluent trough by the overflow of grid type cowling panel.
The present invention compared with prior art has following advantage and beneficial effect:
1, aerated biological activated carbon of the present invention filter tank is applied to feed water after the common process coagulating sedimentation before the sand filtration, because the settling tank delivery turbidity is lower, thereby avoided treating that the drainage turbidity is excessive and increase the weight of the problem that burden is filtered in the biological filter, so adopt the bio-carrier of granulated active carbon as filter tank of the present invention; And the employing granulated active carbon can act on the labile organic compound of removing in the water by hold back filtration, absorption, the biological degradation etc. of carbon leaching material and attached microbial thereof, thereby has ensured that the filter tank is to ammonia nitrogen and removal effect of organic matter.
2, adopt single hole film aeration filter head can under the situation of little gas-water ratio, realize uniform aeration as the aerating system in filter tank, and owing to single hole film aeration filter head is positioned under the filter plate, cleaning or replacing to the fault filter, the maintainer only needs to enter the filter tank by water and air distributing district manhole at the bottom of the pond and overhauls and get final product, simple to operate, overcome the fenestra aeration tube that maintenance is arranged in the supporting layer and need take out filtrate, the problem that the cost of overhaul is high.
3, the filter tank flushing adopts air water to unite the backwashing manner of flushing down, employing is arranged in the perforation gas-distribution pipe in water and air distributing district, bottom, filter tank to the filter tank blast aeration, open emptying valve at the bottom of the pond simultaneously, wash-down water flows out the filter tank from top to down, can effectively remove the inertia deposition that is arranged in water and air distributing district at the bottom of lower floor's filtrate and the pond, reach the reduction water head loss by filtration, recover the effect of filter tank processing power, overcome backwashing manner that the flow lifting type BAF adopts wash-down water to walk from bottom to top and failed effectively to remove the defective that is accumulated in inertia deposition in the filtering layer.
4, blast aeration flow lifting type carbon filtering pool has aeration stripping CO 2The function of gas can be avoided CO 2Dissolve in and reduce the pH value in the water.And flow lifting type carbon filtering pool air water concurrent, help improving filtering velocity and reduce the filtering surface area, also help falling being connected of streaming sand filter with follow-up.
5, the canal for water distribution in aerated biological activated carbon filter tank is positioned in the middle of two flow lifting type aerated biological activated carbon filter tanks and is total to wall and constitutes " product " font structure, and the space between the three is used to arrange various pipelines and valve and equipment as the common piping lane; Not only be convenient to maintenance management, also can significantly save and take up an area of and the reduction cost.
Description of drawings
Fig. 1 is the structural representation in the aerated biological activated carbon filter tank among the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples:
As shown in Figure 1, the aerated biological activated carbon filter tank is two, symmetry is positioned at the canal for water distribution both sides respectively, canal for water distribution is positioned at the piping lane top of settling pipeline, canal for water distribution comprises total inlet channel 1, first distributing flue 3 and second distributing flue 5, total inlet channel 1 is communicated with first distributing flue 3 of its both sides respectively by inlet gate 2, two distributing flues the 1 are communicated with second distributing flue 5 respectively, and two second distributing flues 5 are communicated with by the water and air distributing trough that is positioned at the piping lane lower end 8 of water inlet pipe 6 with two flow lifting type aerated biological activated carbon filter tanks respectively.
The aerated biological activated carbon filter tank is the flow lifting type filter tank, is provided with single hole film aeration filter head 12, filter plate 13, coarse sand supporting layer 14 and double-deck granulated active carbon filtrate 15 and 16 in the pond body in filter tank from top to bottom successively; Single hole film aeration filter head 12 is installed in the filter plate 13; Be provided with effluent trough 19 in the outside, pond body upper end, effluent trough 19 is connected with the pond body by grid type cowling panel 17; Water and air distributing trough 8 is communicated with body lower end, pond; Coarse sand supporting layer 14 particle diameters are in 2.5~5mm scope, and thickness is in 0.15~0.2m scope; Upper strata granulated active carbon particle diameter of filter medium is in 1.5~2.0mm scope, and thickness is in 1.0~2.0m scope; Lower floor's granulated active carbon particle diameter of filter medium is in 2.0~2.5mm scope, and filtrate thickness is in 0.5~1.0m scope.
The aeration in aerated biological activated carbon filter tank adopts the blast aeration system of concentrating, and aeration tube 31 1 ends are communicated with the water and air distributing trough 8 in filter tank, and the other end is connected with aeration main 29, and aeration main 29 is connected with aeration blower 34.The filter tank is by the blast aeration system oxygen supply.
The aerated biological activated carbon filter tank also is provided with concentrated air water and unites rinse-system down, and this rinse-system comprises gas flushing main 20, gas flushing arm 22, gas flushing perforation gas-distribution pipe 23, water flushing main 24, water flushing arm 26, wash-water pump 33 and flushing gas blower 32; The rising pipe of wash-water pump 33 is connected with water flushing main 24; Flushing gas blower 32 is connected with gas flushing main 20; Gas flushing main 20 is connected towards arm 22 with two gas respectively, and gas is connected with perforation gas-distribution pipe 23 towards arm 22, and perforation gas-distribution pipe 23 passes water and air distributing trough 8 and is arranged in the bottom, filter tank; Water flushing main 24 is connected with two water flushing arm 26 respectively, and water flushing arm 26 is connected with two water and air distributing troughs 8.
The water inlet pipe 6 that the distributing flue the 25 in aerated biological activated carbon filter tank and water and air distributing trough 8 are communicated with is provided with into water butterfly valve 7; Aeration tube 31 is provided with aerating regulation butterfly valve 30; Water flushing arm 26 is provided with flushing water inlet butterfly valve 25; Gas flushing arm 22 is provided with flushing air inlet disk valve 21.
The method for the treatment of drainage is handled in the aerated biological activated carbon filter tank: treat that drainage enters two first distributing flues 3 respectively from the inlet gate 2 of total inlet channel 1, cross overflow weir 4 and enter second distributing flue 5, enter aerated biological activated carbon filter tank water and air distributing trough 8 by water inlet pipe 6 and water intaking valve 7, allocating filter tank body 11 into from distributing hole 9 then upwards flows, pass filter plate 13 by single hole film aeration filter head 12, be evenly distributed to coarse sand bed course 14 and double-layer active charcoal filtrate 15 and 16.Empty bed filtering velocity is 8~16m/h; Enter the air distribution and water distribution groove 8 in filter tank through aerated conduit 31 and aerating regulation valve 30 from the pressurized air of aeration blower 34, allocate filter tank body 11 into from air distribution hole 10 then, below filter plate 13, form air cushion layer, fenestra by single hole film aeration filter head 12 enters the filter handle, again with treat drainage upper reaches aeration in the same way, gas-water ratio 0~0.8: 1, for the microbial film of growing on coarse sand bed course 14 and double-layer active charcoal filtrate 15 and 16 provides sufficient dissolved oxygen and disturbance mass transfer; Under biomembrane biochemistry and charcoal absorption effect, remove ammonia nitrogen, organism and part heavy metal in the water, the water after the purification is crossed overflow weir 18 and is entered effluent trough 19 by grid type cowling panel 17, imports sand filter then.
Aerations are concentrated by aeration blower 34 in the aerated biological activated carbon filter tank, regulate air demand by opening 34 numbers of gas blower and variable frequency control, with the seasonal variation that the adapts to raw water quality different needs to air demand.
When the aerated biological activated carbon filter tank need be washed, close into water butterfly valve 7, open emptying butterfly valve 27; After several minutes, close emptying butterfly valve 27, open flushing water inlet butterfly valve 25 and wash-water pump 33, wash-down water enters in the pond through water flushing main 24 and water flushing arm 26, by water and air distributing trough 8 and single hole film aeration filter head 12 uniform distribution; The water flushing is after several minutes, close wash-water pump 33 and aeration butterfly valve 30, open flushing air inlet disk valve 21 and flushing gas blower 32, flushing out air enters in the pond through gas flushing main 20, gas flushing arm 22 and perforation gas-distribution pipe 23, by single hole film aeration filter head 12 uniform distribution, suspended substance in filter material surface and the slit comes off under the strong friction of air-flow, and the inertia deposition in water and air distributing district has also been disturbed under 23 blast aerations of perforation gas-distribution pipe at the bottom of the pond; After several minutes, open emptying butterfly valve 27, the inertia deposition at the bottom of filtering layer and the pond in the water and air distributing district drains into outside the pond through blow-down pipe 28 with wash-down water.The program that back flushing is finished in this filter tank is: behind the emptying number minute, close emptying butterfly valve 27, open wash-water pump 33; Close wash-water pump 33 and wash-down water butterfly valve 25 after several minutes, open water inlet butterfly valve 7; Close flushing gas blower 32 and flushing air inlet disk valve 21 after several minutes, open aeration butterfly valve 30, recover the normal filtration state.
Aerated biological activated carbon of the present invention filter tank is applied to feed water before the sand filtration afterwards of common process coagulating sedimentation, because the settling tank delivery turbidity is lower, thereby avoided treating that the drainage turbidity is excessive and increase the weight of the problem that burden is filtered in the biological filter, so adopt the bio-carrier of granulated active carbon as filter tank of the present invention; And the employing granulated active carbon can act on the labile organic compound of removing in the water by hold back filtration, absorption, the biological degradation etc. of carbon leaching material and attached microbial thereof, thereby has ensured that the filter tank is to ammonia nitrogen and removal effect of organic matter.
The aerating system of single hole film aeration filter head as the filter tank adopted in aerated biological activated carbon of the present invention filter tank, can under the situation of little gas-water ratio, realize uniform aeration, and owing to single hole film aeration filter head is positioned under the filter plate, cleaning or replacing to the fault filter, the maintainer only needs to enter the filter tank by water and air distributing district manhole at the bottom of the pond and overhauls and get final product, and maintenance makes things convenient for.
The filter tank flushing adopts air water to unite the backwashing manner of flushing down, adopt the perforation gas-distribution pipe to the filter tank blast aeration, wash-down water flows out the filter tank from top to down, can effectively remove the inertia deposition that is arranged in water and air distributing district at the bottom of lower floor's filtrate and the pond, reach the reduction water head loss by filtration, recover the effect of filter tank processing power.

Claims (3)

1. aerated biological activated carbon filter tank, it is characterized in that: comprise two flow lifting type aerated biological activated carbon filter tanks, symmetry is positioned at the canal for water distribution both sides respectively, canal for water distribution is positioned at the piping lane top of settling pipeline, described canal for water distribution comprises total inlet channel, first distributing flue and second distributing flue, total inlet channel is communicated with first distributing flue of its both sides respectively by inlet gate, two first distributing flues are communicated with second distributing flue in its outside respectively, and two second distributing flues are communicated with by the water and air distributing trough that is positioned at the piping lane lower end of water inlet pipe with two flow lifting type aerated biological activated carbon filter tanks respectively; Aeration tube one end is communicated with the water and air distributing trough in filter tank, and the other end is connected with the aeration main, and the aeration main is connected with aeration blower;
Be provided with single hole film aeration filter head, filter plate, coarse sand bed course and double-deck granulated active carbon filtrate in the pond body in described flow lifting type aerated biological activated carbon filter tank from top to bottom successively; Single hole film aeration filter head is installed in the filter plate; Be provided with effluent trough in the outside, pond body upper end, effluent trough is connected with the pond body by grid type cowling panel; Water and air distributing trough is communicated with body lower end, pond; Coarse sand supporting layer particle diameter is in 2.5~5mm scope, and thickness is in 0.15~0.2m scope; Upper strata granulated active carbon particle diameter of filter medium is in 1.5~2.0mm scope, and thickness is in 1.0~2.0m scope; Lower floor's granulated active carbon particle diameter of filter medium is in 2.0~2.5mm scope, and filtrate thickness is in 0.5~1.0m scope;
Described aerated biological activated carbon filter tank also is provided with concentrated air water and unites rinse-system down, comprises gas flushing main, gas flushing arm, gas flushing perforation gas-distribution pipe, water flushing main, water flushing arm, wash-water pump and flushing gas blower; The rising pipe of described wash-water pump is connected with water flushing main; Described flushing gas blower is connected with the gas flushing main; The gas flushing main props up pipe coupling with two gas flushings respectively, and the gas flushing arm is connected with the perforation gas-distribution pipe, and the perforation gas-distribution pipe passes water and air distributing trough and is arranged in water and air distributing district, bottom, filter tank; Water flushing main props up pipe coupling with the flushing of two water respectively, and water flushing arm is connected with two water and air distributing troughs;
The water inlet pipe that is communicated with second distributing flue and water and air distributing trough is provided with into water butterfly valve; Described aeration tube is provided with the aerating regulation butterfly valve; Blow-down pipe is provided with the draining butterfly valve at the bottom of the described pond.
2. described aerated biological activated carbon according to claim 1 filter tank is characterized in that: the described water inlet pipe that is communicated with second distributing flue and water and air distributing trough is provided with into water butterfly valve; Described water flushing arm is provided with flushing water inlet butterfly valve; Described gas flushing arm is provided with the flushing air inlet disk valve.
3. application rights requires the method for 1 described aerated biological activated carbon filter tank polished feedwater: treat that drainage enters two first distributing flues respectively from the inlet gate of total inlet channel, overflow enters second distributing flue, enter aerated biological activated carbon filter tank water and air distributing trough by water inlet pipe, allocate into then in the body of filter tank and flow filtering velocity 8~16m/h to last; Enter the air distribution and water distribution groove in filter tank through aerated conduit from the pressurized air of aeration blower, allocate into then in the body of filter tank, below filter plate, form air cushion layer, fenestra by single hole film aeration filter head enters the filter handle, again with treat drainage upper reaches aeration in the same way, gas-water ratio 0~0.8: 1, for the microbial film of growing on coarse sand bed course and the carbon leaching material provides sufficient dissolved oxygen and disturbance mass transfer; Under biomembrane biochemistry and charcoal absorption effect, remove ammonia nitrogen, organism and part heavy metal in the water, the water after the purification enters effluent trough by the overflow of grid type cowling panel.
CN2009101935640A 2009-10-31 2009-10-31 Aerated biological activated carbon filters and method of applying same to purify feed water Active CN101708891B (en)

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Publication number Priority date Publication date Assignee Title
CN102502952A (en) * 2011-11-08 2012-06-20 清华大学 Drinking water treatment aeration carbon sand filtering tank capable of improving ammonia nitrogen removal capacity
CN102502952B (en) * 2011-11-08 2014-04-16 清华大学 Drinking water treatment aeration carbon sand filtering tank capable of improving ammonia nitrogen removal capacity

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