CN102249482A - Method for improving denitrogenation efficiency of earthworm ecological filter tank - Google Patents
Method for improving denitrogenation efficiency of earthworm ecological filter tank Download PDFInfo
- Publication number
- CN102249482A CN102249482A CN2011101261768A CN201110126176A CN102249482A CN 102249482 A CN102249482 A CN 102249482A CN 2011101261768 A CN2011101261768 A CN 2011101261768A CN 201110126176 A CN201110126176 A CN 201110126176A CN 102249482 A CN102249482 A CN 102249482A
- Authority
- CN
- China
- Prior art keywords
- earthworm
- sewage
- ecological filter
- water distribution
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a method for improving denitrogenation efficiency of an earthworm ecological filter tank. The method is characterized in that: sewage is subjected to solid-liquid separation; the separated sewage is aerates through an aerator; then the resulting sewage is distributed into an earthworm ecological filter tank through a distributor, wherein the earthworm ecological filter tank sequentially comprises a cobble layer, a bluestone layer, a yellow sand layer and a soil layer containing earthworms from the bottom to the top, and adopts a alternation way of drying and wetting to carry out sewage removing treatment. The sewage is distributed into the earthworm ecological filter tank in two times in one water distribution period, wherein the first water distribution is provided for distributing the sewage into the earthworm ecological filter tank, and the second water distribution is provided for distributing the sewage from the position between the soil layer and the yellow sand layer and/or the position between the yellow sand layer and the bluestone layer into the earthworm ecological filter tank. According to the method provided by the present invention, the denitrogenation effect of the single earthworm ecological filter tank on the premise of no influence on other water quality indicators is substantially improved, the nitrogen removing rate of the system is raised. In addition, the method provided by the present invention has characteristics of reasonable water distribution, good treatment effect, high total nitrogen removing rate, low energy consuming and low construction cost.
Description
Technical field
The invention belongs to environmental technology field, be specifically related to a kind of method that improves the earthworm and ecological filter nitric efficiency.
Background technology
Fast development along with economic society, a large amount of sewage of administering without control directly or indirectly enter water body, substantially exceeded environmental capacity, make pollution serious day by day, the wherein eutrophication, the algal tufa that pour in water bodys such as causing river, lake of nitrogen, the pressure that therefore alleviates polluted by nitrogen and eutrophication is extremely urgent.Earthworm and ecological filter is a kind of Sewage treatment systems of strengthening ecotechnology, utilize earthworm up and down in the process of looking for food, loose filtrate has strengthened the permeability of filtering layer, be beneficial to organic degraded, earthworm as foodstuff, has been realized the minimizing and the stabilization of mud with the microbial film in the filter bed, has solved blocking problem in the general biological filter, there is symplastic growth between the microorganisms such as earthworm and nitrobacteria simultaneously, improved the nitrification of system.
But the deficiency that single earthworm and ecological filter exists aspect denitrification effect, the existing document that earthworm and ecological filter is carried out denitrogenation in the prior art, as Chinese patent application numbers 200910032123.2, patent name is: earthworm and ecological filter-denitrification bio-filter combined system is handled the technology of organic sewage, this patent readme is: " adopting tower earthworm ecological filter tank and DNBF combination process organic sewage to be reached the purpose of efficient processing; wherein the total nitrogen average removal rate is greater than 88%, and water outlet reaches the first discharge standard of GB8978-1996 "; Number of patent application 200810018774.1 in addition, patent name is: a kind of tower earthworm ecological filter tank of handling sanitary sewage, this patent readme is " with tower earthworm ecological filter tank and artificial swamp combination; the nitrogen removal rate of system is all more than 85% under high water conservancy load; other material is removed more than 90%, water reuse in can reaching fully ".It is that combination by kinds of processes realizes that yet most of earthworm and ecological filter is finished denitrification process in the sewage, and the method for single earthworm and ecological filter efficient denitrification is also rarely had report.
Summary of the invention
The objective of the invention is at the deficiency of single earthworm and ecological filter the existence of denitrification effect aspect, by changing water distribution manner, under the prerequisite that does not influence other water-quality guideline, the raising system is to the clearance of nitrogen, provides that a kind of water distribution is reasonable, treatment effect good, nitrogen removal rate is high, energy consumption and the low sewage water treatment method of construction cost.
Purpose of the present invention can reach by following measure:
A kind of method that improves the earthworm and ecological filter nitric efficiency: earlier sewage is carried out solid-liquid separation, behind the sewage process aerator aeration after the separation, be distributed into from bottom to top successively sewage by pebbles layer, green stone layer, yellow sand layer and contain the earthworm and ecological filter that the pedosphere of earthworm forms by water-distributing device, this earthworm and ecological filter adopts the mode of alternation of wetting and drying to carry out decontamination and handles; Wherein a water distribution in the cycle sewage be distributed in the earthworm and ecological filter at twice, a water distribution is that sewage is distributed into the earthworm and ecological filter from the top layer, the secondary water distribution be with sewage between the pedosphere of earthworm and ecological filter and yellow sand layer and/or be distributed into the earthworm and ecological filter between yellow sand layer and the green stone layer.
A water distribution of the present invention (being surperficial water distribution) is finished by the rotary water distributor of being located at described earthworm and ecological filter top, and its cloth water area can reach 1m
2About, rotary water distributor generally is positioned at earthworm and ecological filter surface 0.5m, and its water distributor is evenly bored a hole, and penetration hole diameter is 1～5mm; The time of a water distribution is 10～100min; The hydraulic load of a described water distribution is 0.1～1.1m
3/ (m
2D).
Secondary water distribution (being lower floor's water distribution) by being located at described earthworm and ecological filter pedosphere and the yellow sand layer between and/or the water distributor between yellow sand layer and the green stone layer finish.According to different water quality and denitrogenation requirement, the water yield, position and the time of regulation system secondary water distribution, for system's denitrification provides enough carbon sources, strengthen denitrification effect, the secondary water distribution is distributed on the plane between the different filtrates, the water distributor aperture is 0.5～3mm, is enclosed with at water distributor and prevents that filtrate from stopping up the harmless cloth of water outlet.The hydraulic load of secondary water distribution is 0.1～1.1m
3/ (m
2D).The time of secondary water distribution is generally 5～60min.
The residence time is meant the residence time after once finishing with the secondary water distribution, effectively the residence time has guaranteed that microorganism in sewage and filtrate itself, the filtrate and the animal in the filter tank fully act on, reach the purpose of efficient denitrification, wherein the residence time of sewage in earthworm and ecological filter is 1h～4h behind water distribution; The residence time of sewage in earthworm and ecological filter is 1h～4h behind the described secondary water distribution.
Water distribution cycle comprises that the emptying after residence time behind residence time behind water distribution, the water distribution, secondary water distribution, the secondary water distribution and secondary water distribution stop puts the time of doing.After finishing a water distribution cycle and earthworm and ecological filter emptying sewage, earthworm and ecological filter stops 3h～12h and enters the next water distribution cycle again in dry environment.
Sewage of the present invention is selected from one or more in sanitary sewage, carnivorous processing waste water, beer waste water or the breeding wastewater.Earthworm and ecological filter of the present invention be more specifically from the bottom to the top successively by pebbles layer, green stone layer, yellow sand layer with contain the earthworm and ecological filter that the pedosphere of earthworm is formed, its cobble layer, green stone layer, yellow sand layer and the edaphic thickness that contains earthworm are respectively 10cm～30cm, 20cm～50cm, 40cm～60cm, 45cm～75cm.The density of earthworm is 10～15g/L soil in the pedosphere.
The present invention can further set up Buffer Pool before earthworm and ecological filter, the aeration of sewage carries out in this Buffer Pool; Be provided with water pump in the described Buffer Pool, this water pump communicates by pipeline with described water-distributing device, is connected with PLC Controlling System or under meter on this pipeline.So a kind of optimal technical scheme of the present invention is as follows: at first before sewage enters earthworm and ecological filter, be provided with one and regulate Buffer Pool, and in the pond, establish the small-sized machine aerator, increase the dissolved oxygen content of water inlet; Submersible pump, liquid level instrument and under meter are installed in the pond, and by the start and stop of automatic control device and liquidometer control pump, under meter is controlled amount of inlet water; Sewage enters the filter tank by rotary water distributor earlier and carries out water distribution one time from the surface, filter tank, after operation for some time, after stopping surperficial water distribution and stop, carry out lower floor's water distribution, only can take the secondary water distribution between the secondary water distribution between pedosphere and the yellow sand layer, yellow sand layer and green stone layer or the two in conjunction with carrying out the secondary water distribution; The secondary water distribution stays for some time after finishing, and electromagnetic valve is opened the sewage after handling is discharged system, enters next cycle behind the environment certain hour that then keeps dry.
Buffer Pool of the present invention has been the purpose of regulating pondage and water quality, and wherein preaeration increases the carrying out that oxygen in water content is beneficial to nitration reaction, reduces the concentration of ammonia nitrogen, determines according to sewage character concrete working time.Rotary water distributor is controlled by pony pump, and wherein the start and stop of turner and flooding time are together by PLC system control, and once water inlet operation turner starts, and once the water inlet device that stops the rotation is static; The setting of liquidometer is for when sewage in the Buffer Pool is too much or very few, and the effect of protection pump and pond body is played in force start or stop the operation of submersible pump.Described under meter is the common liq under meter, can not only write down the size of flow, can also change the water inlet hydraulic load according to water inlet and the effect of handling.The water outlet of magnetic valve and PLC Controlling System, after sewage stops end,, under falling dried environment, the nothing water inlet keeps 3h～12h for the reoxygenation amount filter tank that increases filtrate then by sewage in the magnetic valve emptying filter tank, when entering next water inlet during the cycle, closed electromagnetic valve.
Method of the present invention can significantly improve the denitrification effect of single earthworm and ecological filter under the prerequisite that does not influence other water-quality guideline, and the raising system is to the clearance of nitrogen, and this method water distribution is reasonable, treatment effect good, nitrogen removal rate is high, energy consumption and construction cost are low.
Description of drawings
Fig. 1 is a kind of apparatus structure synoptic diagram of the present invention.
Among the figure, 1-Buffer Pool, 2-liquid level instrument, the 3-submersible pump, 4-aerator, 5-under meter, the 6-PLC Controlling System, 7-electric motor, the rotary water distributor of 8-, the 9-water distributor, 10-valve, 11-magnetic valve, 12-pedosphere (containing earthworm), 13-yellow sand layer, 14-green stone layer, 15-pebbles layer, the 16-earthworm and ecological filter.
Embodiment
The structure of the treatment unit of present embodiment as shown in Figure 1, earthworm and ecological filter 16 is made up of pebbles layer 15, green stone layer 14, yellow sand layer 13 and the pedosphere 12 that contains earthworm successively from the bottom to the top.Before earthworm and ecological filter 16, establish Buffer Pool 1, liquid level instrument 2, submersible pump 3 and aerator 4 are installed in the Buffer Pool 1, liquid level instrument 2 is installed on Buffer Pool 1 wall in order to detect the water yield in the Buffer Pool 1, submersible pump 3 pumps into sewage the earthworm and ecological filter 16 in Buffer Pool 1, aerator 4 is to regulate flooding velocity and dissolved oxygen concentration.Under meter 5 links to each other with the pipeline that sewage is led to earthworm and ecological filter respectively with PLC Controlling System 6, and by the start and stop of automatic control device and liquidometer control pump, under meter is controlled amount of inlet water.Be positioned at the surface of earthworm and ecological filter by the rotary water distributor 8 that links to each other with submersible pump of electric motor 7 drives; The water distributor 9 that links to each other with submersible pump by pipeline is distributed between pedosphere and the yellow sand layer and between yellow sand layer and the green stone layer.
Sewage enters the filter tank by rotary water distributor 8 earlier and carries out water distribution one time from the surface, filter tank, after operation for some time, stop surperficial water distribution and stay for some time, follow-up difference according to treatment process, can only carry out surperficial water distribution (being prior art), also can proceed lower floor's water distribution, lower floor's water distribution only can take the secondary water distribution between the secondary water distribution between pedosphere and the yellow sand layer, yellow sand layer and green stone layer or the two in conjunction with carrying out the secondary water distribution, by valve 10 control lower floor water distributions; The secondary water distribution stays for some time after finishing, and electromagnetic valve 11 is opened the sewage after handling is discharged system, enters next cycle behind the environment certain hour that then keeps dry.
Embodiment 1: to the denitrification effect of Nanjing University's dormitory sanitary sewage
Long 4 meters of Buffer Pool size, wide 2.5 meters, 1.5 meters of total depths, 1.2 meters of significant depths, the PVC material is made.Make up four same earthworm and ecological filters made from PVC, wherein structure as shown in Figure 1.The filter tank body is cylindrical, total height 1.2m, diameter 1.20m, filter material layer height 1.1m, 45cm soil (earthworm density 12.5g/L soil), 35cm yellow sand, 20cm green stone and 10cm pebbles from top to bottom; The aperture of the water distributor of rotary water distributor is 2mm, and the aperture of lower floor's water distributor is 1mm.Four earthworm and ecological filters are handled respectively, four identical running conditions: preaeration 10min before each water inlet is 0.6m at hydraulic load
3/ (m
2D) top layer once intakes under the condition, and all water distributions of one-period finish to drain sewage after the back stops 90min, enter next cycle after falling to doing 270min.Different operational conditionss: the 1# filter tank is water distribution 30min for once,, a cloth water retention time 1h, the water distribution 20min in 2#, 3# and 4# filter tank, a cloth water retention time 1h, it is 0.4m at hydraulic load that a water distribution finishes above-mentioned three filter tanks, back
3/ (m
2D) secondary water distribution under the condition, wherein the 2# filter tank is at secondary water distribution 15min between pedosphere and yellow sand layer, the 3# filter tank is secondary water distribution 15min between yellow sand layer and green stone layer, and the 4# filter tank is at secondary water distribution 15min simultaneously between pedosphere and the yellow sand layer, between yellow sand layer and the green stone layer.All filter tank water inlet total amounts are consistent.
Denitrification effect through the different water distribution manners of earthworm and ecological filter compares, the clearance of total nitrogen is respectively 57%, 85%, 76%, 90% in 1～4 pair of sewage in filter tank, increase the removal effect that the secondary water distribution has improved total nitrogen as can be seen, other water-quality guideline have also kept higher removal simultaneously.
Table 1
Embodiment 2: to the denitrification effect of certain plant's waste water
Long 5 meters of Buffer Pool size, wide 3 meters, 1.8 meters of total depths, 1.5 meters of significant depths, brick mix structure.Earthworm and ecological filter also is cubes for brick mix structure, total height 1.5m, and the filter tank length and width are respectively 1.2m, 0.8m, filter material layer height 1.3m, 50cm soil (earthworm density 12g/L soil), 40cm yellow sand, 30cm green stone and 10cm pebbles from top to bottom; The aperture of the water distributor of rotary water distributor and lower floor's water distributor is respectively 2mm, 1mm.Plant's waste water flow to septic tank by pipeline, and the septic tank supernatant liquor enters Buffer Pool and regulates mixing.The earthworm and ecological filter operational conditions: first kind of preaeration 1h, hydraulic load are 1m
3/ (m
2D) water distribution 45min in top layer under the condition drains sewage after stopping 150min behind the water inlet end, enters next the circulation after falling to doing 450min; Second kind of preaeration 1h is 1m at hydraulic load
3/ (m
2D) water distribution 30min in top layer under the condition, a cloth water retention time 1.5h is 0.6m at hydraulic load
3/ (m
2D) under the condition between pedosphere and yellow sand layer secondary water distribution 25min, drain sewage after stopping 200min behind the water inlet end, enter next the circulation after falling to doing 600min.Total nitrogen concentration all has obvious reduction under two kinds of operation scheme, and wherein second kind of operation scheme improves obviously nitrogen removal rate, and all the other indexs change little.
Table 2
Claims (9)
1. method that improves the earthworm and ecological filter nitric efficiency, it is characterized in that: earlier sewage is carried out solid-liquid separation, behind the sewage process aerator aeration after the separation, be distributed into from bottom to top successively sewage by pebbles layer, green stone layer, yellow sand layer and contain the earthworm and ecological filter that the pedosphere of earthworm forms by water-distributing device, this earthworm and ecological filter adopts the mode of alternation of wetting and drying to carry out decontamination and handles; Wherein a water distribution in the cycle sewage be distributed in the earthworm and ecological filter at twice, a water distribution is that sewage is distributed into the earthworm and ecological filter from the top layer, the secondary water distribution be with sewage between the pedosphere of earthworm and ecological filter and yellow sand layer and/or be distributed into the earthworm and ecological filter between yellow sand layer and the green stone layer.
2. method according to claim 1 is characterized in that: a described water distribution is finished by the rotary water distributor of being located at described earthworm and ecological filter top; Described secondary water distribution by being located at described earthworm and ecological filter pedosphere and the yellow sand layer between and/or the water distributor between yellow sand layer and the green stone layer finish.
3. method according to claim 1 is characterized in that: the hydraulic load of a described water distribution or secondary water distribution is 0.1～1.1m
3/ (m
2D), the diameter of the water distributing pore of described rotary water distributor is 1～5mm; The aperture of the water distributing pore of the water distributor of described secondary water distribution is 0.5～3mm, also is enclosed with non-woven fabrics on this water distributor.
4. method according to claim 1 is characterized in that: the residence time of sewage in earthworm and ecological filter is 1h～4h behind the described water distribution; The residence time of sewage in earthworm and ecological filter is 1h～4h behind the described secondary water distribution.
5. method according to claim 1 is characterized in that: the time of a described water distribution is 10～100min, and the time of described secondary water distribution is 5～60min.
6. method according to claim 1 is characterized in that: after finishing a water distribution cycle and earthworm and ecological filter emptying sewage, earthworm and ecological filter stops 3h～12h and enters the next water distribution cycle again in dry environment.
7. method according to claim 1 is characterized in that: described sewage is selected from one or more in sanitary sewage, carnivorous processing waste water, beer waste water or the breeding wastewater.
8. method according to claim 1 is characterized in that: the pebbles layer of described earthworm and ecological filter, green stone layer, yellow sand layer and the edaphic thickness that contains earthworm are respectively 10cm～30cm, 20cm～50cm, 40cm～60cm, 45cm～75cm.
9. method according to claim 1 is characterized in that: be provided with Buffer Pool before described earthworm and ecological filter, the aeration of sewage carries out in this Buffer Pool; Be provided with water pump in the described Buffer Pool, this water pump communicates by pipeline with described water-distributing device, is connected with PLC Controlling System or under meter on this pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101261768A CN102249482A (en) | 2011-05-16 | 2011-05-16 | Method for improving denitrogenation efficiency of earthworm ecological filter tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101261768A CN102249482A (en) | 2011-05-16 | 2011-05-16 | Method for improving denitrogenation efficiency of earthworm ecological filter tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102249482A true CN102249482A (en) | 2011-11-23 |
Family
ID=44977116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101261768A Pending CN102249482A (en) | 2011-05-16 | 2011-05-16 | Method for improving denitrogenation efficiency of earthworm ecological filter tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102249482A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250014A (en) * | 2008-01-23 | 2008-08-27 | 南京大学 | Tower earthworm ecological filter tank system |
| CN101284705A (en) * | 2008-01-23 | 2008-10-15 | 南京大学 | Tower type earthworm and ecological filter for treating sewage |
-
2011
- 2011-05-16 CN CN2011101261768A patent/CN102249482A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250014A (en) * | 2008-01-23 | 2008-08-27 | 南京大学 | Tower earthworm ecological filter tank system |
| CN101284705A (en) * | 2008-01-23 | 2008-10-15 | 南京大学 | Tower type earthworm and ecological filter for treating sewage |
Non-Patent Citations (1)
| Title |
|---|
| 李军状，等: "蚯蚓生态滤池处理农村生活污水现场试验研究", 《环境污染与防治》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106316004B (en) | A kind of method of the direct deep purifying of high concentrated organic wastewater | |
| CN203247146U (en) | Ecological earthworm filtering pool with effective denitrification function | |
| CN105693014B (en) | A kind of sewage disposal system and sewage water treatment method | |
| CN205528306U (en) | Float water processing system that water treatment facilities and this equipment of application are synthesized to formula | |
| CN105010206B (en) | Closed type industrial circulating water fish-cultivating method | |
| CN108314183A (en) | A kind of operation method of denitrification deep-bed filter system | |
| CN105645601B (en) | A kind of biofilter and sewage water treatment method | |
| CN105036332B (en) | One kind alternating internal circulation biological filter sewage-treatment plant and its application method | |
| CN105859059A (en) | Biochemical treatment method of testudinate industrial aquaculture wastewater | |
| CN109349197A (en) | A kind of aquatic farm water circulation system and its control method | |
| CN110117070A (en) | Energy-efficient compact compound A2/ O dephosphorization denitrogenation processing system and treatment process | |
| CN103253837B (en) | Denitrification filter system | |
| CN103214090B (en) | Anoxic humic filler filter tank and method for treating nitrogen containing degradation-resistant wastewater | |
| CN105130092A (en) | Treatment device and method for degradation and nitrogen removal of printing and dyeing wastewater high-concentration organic matters | |
| CN103304029B (en) | A kind of Artificial soil infiltration system processing rural area decentralized type sewage | |
| CN201999835U (en) | Anaerobic hydrolytic acidification and AO-SBR (anoxic/oxic-sequencing batch reactor activated sludge process) integrated sewage treatment reaction tank | |
| JP3939664B2 (en) | Purification method and system for lakes and the like | |
| CN103693818B (en) | Coking wastewater biochemical treatment and sedimentation tank | |
| CN203498222U (en) | System for treating industrial wastewater generated in kid lamb skin processing industry | |
| CN105502830A (en) | System and method for treating black and odorous stagnant water | |
| CN102503045B (en) | Biomembrane sewage processing method | |
| CN102249482A (en) | Method for improving denitrogenation efficiency of earthworm ecological filter tank | |
| CN208151064U (en) | Energy-efficient compact compound A2/O dephosphorization denitrogenation processing system | |
| CN202346821U (en) | Macroporous filter material biological aerated filter | |
| CN107010726B (en) | One kind is drifted along formula water purification system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20111123 |
|
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |