CN106565055A - Deep nitrogen removal method for sewage - Google Patents
Deep nitrogen removal method for sewage Download PDFInfo
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- CN106565055A CN106565055A CN201610878550.2A CN201610878550A CN106565055A CN 106565055 A CN106565055 A CN 106565055A CN 201610878550 A CN201610878550 A CN 201610878550A CN 106565055 A CN106565055 A CN 106565055A
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- sewage
- pond
- autotrophic denitrification
- treatment plant
- biological adsorption
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Belonging to the technical field of sewage treatment, the invention discloses a deep nitrogen removal method for sewage. The method involves a biosorption tank, a sedimentation tank, a membrane reaction tank and a sulfur autotrophic denitrification filter tank. The sewage treatment device provided by the invention has high autotrophic nitrogen removal efficiency, can stably acquire less than 6mg/L total nitrogen effluent water at an HRT of 2.7h effluent far below the 15mg/L effluent water requirement of the first grade A standard, and reduces the floor space of sewage treatment plant. In addition, the combined process has no need of additional carbon resources, most carbon sources in raw water are enriched in sludge, a recycling treatment mode of anaerobic fermentation for production of volatile acid or methane can produce high value added products, thus realizing resource utilization of sludge. The combined process has the advantages of floor space saving, low running cost, and generation of recycling additional products, and is of important significance for exploration of sewage treatment new ideas in line with China's national conditions.
Description
Technical field
The present invention relates to a kind of method of sewage deep denitrogenation, belongs to technical field of sewage.
Background technology
Total nitrogen is that sewage treatment plant predominantly detects water quality index, and at present sewage treatment plant of the country generally performs《Cities and towns
Wastewater Treatment discharge standard》(GB18918-2002) the one-level A standard in, wherein total nitrogen concentration must not exceed
15mg/L.At present the main flow denitrogenation method of urban wastewater treatment firm be based on " nitrification-denitrification " technique of activated sludge process, its
In complete denitrogenation committed step is denitrification process, what the process mainly played a role is the micro- life of heterotrophism in activated sludge
Thing, is nitrogen by receiving external electron-donor by nitrate-nitrogen reduction, and the high-quality carbon source such as methanol, acetic acid, propanoic acid can be provided with
Effect electron donor.But the most of urban wastewater treatment firms of China have that carbon source is not enough, carbon-nitrogen ratio is unbalance in water inlet, for
Traditional activated sludge process heterotrophism denitrogenation causes huge challenge.
Traditional wastewater process is mostly adopted in the way of " by energy energy dissipating ", i.e., made a return journey by consuming a large amount of electric energy with aeration mode
Decontamination water pollutant, but this actual " carbon footprint " that increased sewage disposal.In addition, the imperfection of municipal sewage pipe network
Make in water containing a large amount of silt particles, cause excess sludge recycling effect poor.
To realize the stably reaching standard of one-level A standard total nitrogen, most of sewage treatment plant will carry out high-quality carbon source and add, significantly
Increased sewage treatment plant's operating cost.In addition, adding for carbon source easily cause heterotrophic bacteria and breed in a large number, the surplus sludge volume of increase
Specific resistance to filtration expense will be caused to raise, sewage treatment plant's operating cost will be improve indirectly.
The content of the invention
For the more efficient removal for realizing total nitrogen in sewage disposal plant effluent, while reducing the running cost of sewage treatment plant
With the invention provides a kind of sewage-treatment plant, described device includes that biological adsorption pond, sedimentation tank, MBR ponds and sulfur autotrophy are anti-
Nitrification tank, the biological adsorption pond is connected with water inlet；The sedimentation tank is in inverted cone, bottom and the two-way company in biological adsorption pond
Connect, top is connected with MBR ponds；The MBR ponds are connected with sulfur autotrophic denitrification pond；The sulfur autotrophic denitrification pond arranges water outlet
Mouthful.
In one embodiment of the invention, the biological adsorption pond, sedimentation tank, MBR ponds and sulfur autotrophic denitrification pond
It is sequentially connected and dischargeable capacity is 1:8:14:3.2.
In one embodiment of the invention, the biological adsorption pond, sedimentation tank, MBR ponds and sulfur autotrophic denitrification filter
The dischargeable capacity in pond is respectively：1.5L, 12L, 21L and 4.8L.
In one embodiment of the invention, the MBR ponds adopt 0.02 μm of Flat Membrane.
In one embodiment of the invention, the sulfur autotrophic denitrification filter tank is bottom-up including supporting layer, denitrogenation
Layer；The support layer height is 10cm, is made up of coarse sand granule of the particle diameter for 5-10mm；The denitrogenation layer filler is elemental sulfur, is filled out
Material particle diameter be 2-4mm, porosity 50%.
Second object of the present invention is to provide and a kind of carries out advanced nitrogen to sewage using the sewage-treatment plant
Method, is, using described sewage-treatment plant, to make sewage first pass through biological adsorption pond and remove particulate matter or Organic substance, then is passed through
Sedimentation tank is precipitated, then carries out advanced nitrogen in MBR ponds and sulfur autotrophic denitrification pond.
In one embodiment of the invention, methods described is to control the biological adsorption tank waterpower time of staying for 0.5h,
Sludge age is 2d, and DO is 0.5-1mg/L, mixed genetic-neural network 4000-5000mg/L.
In one embodiment of the invention, methods described is to control MBR ponds membrane flux for 10L/m2H, waterpower is stopped
The time is stayed to be 7h, sludge age is 20d, DO scopes 5-7mg/L, mixed genetic-neural network 6500-8000mg/L.
In one embodiment of the invention, methods described is control sulfur autotrophic denitrification filter tank hydraulic detention time
2.7h。
Beneficial effect：Sewage disposal work of the present invention with reference to biological adsorption, membrane bioreactor MBR and sulfur autotrophic denitrification
Skill is removed to former water pollutant, while a whole set of group technology hydraulic detention time is reduced, realizes sewage disposal
Advanced nitrogen, reduce operating cost.The sewage-treatment plant autotrophic denitrification efficiency of the present invention is higher, when HRT is 2.7h
The total nitrogen water outlet less than 6mg/L can be stably obtained, is required far below the water outlet of one-level A standard 15mg/L, and reduce dirt
The floor space of water treatment plant.In addition, the group technology is without the need for additional carbon, the carbon source in most of raw water is enriched in sludge
In, producing volatile acid or methanogenic recycling treatment mode using anaerobic fermentation can produce the higher product of added value, realize dirty
The recycling of mud.The group technology has saving floor space, operating cost relatively low, while the additional product of resource can be produced
The advantage of thing, it is significant for the sewage disposal new approaches that exploration tallies with the national condition.
Description of the drawings
Fig. 1 is the sewage deep denitrification process figure of the present invention；1, intake pump；2, blower fan；3, biological adsorption pond；4, sludge is returned
Stream pump；5, sedimentation tank；6, aerator；7, MBR ponds；8, MBR go out water pump；9, sulfur autotrophic denitrification pond；10, denitrogenation layer；11：Support
Layer；
Fig. 2 is removal effect of the biological adsorption section to total nitrogen；
Removal effect of Fig. 3 biological adsorptions section to ammonia nitrogen；
Fig. 4 is removal effect of the biological adsorption section to COD；
Fig. 5 biological adsorptions section MLSS and MLVSS/MLSS change；MLVSS：Mixed liquor volatile suspended solid, MLVSS；
Fig. 6 group technology water outlet total nitrogens, ammonia nitrogen and COD concentration values.
Specific embodiment
The design of the sewage-treatment plant of embodiment 1
Sewage disposal reaction unit (as shown in Figure 1) is made using acrylic board, including biological adsorption pond 3, sedimentation tank 5,
MBR ponds 7, sulfur autotrophic denitrification pond 9, the front end of biological adsorption pond 3 arranges intake pump 1, biological adsorption pond 3 and sedimentation tank 5 it
Between arrange sludge reflux pump 4；The sedimentation tank 5 is in inverted cone, and bottom is bi-directionally connected with biological adsorption pond 3, top and MBR ponds 7
Connection；The MBR ponds 7 adopt and arrange in 0.02 μm of Flat Membrane, MBR ponds 7 breather line, and pipeline is connected with aerator 6；MBR ponds 7
MBR is set and sulfur autotrophic denitrification pond 9 between and water pump 8, thus pump aspirates water outlet from MBR ponds, pumps into sulfur autotrophic denitrification pond；
Biological adsorption pond 3, sedimentation tank 5, MBR ponds 7, the dischargeable capacity in sulfur autotrophic denitrification pond 9 are respectively：1.5L, 12L, 21L and
4.8L.The internal diameter of sulfur autotrophic denitrification pond 9 is 10cm, bottom-up including supporting layer, denitrogenation layer；Support layer height is
10cm, is made up of coarse sand granule of the particle diameter for 5-10mm；Denitrogenation layer filler is sulfur grain, is highly 60cm.
In the device, biological adsorption section can adsorb into Organic substance in water, reduction subsequent processing units organic loading and have
Malicious harmful substance affects, and produces the sludge of a large amount of high organic contents, for anaerobic fermentation/digestion, realizes recycling；
MBR ponds replace the second pond design of traditional biological handling process to maintain higher sludge concentration, improve the organic of biological treatment
Load, and advantageously reduce the floor space of sewage treatment facility.In addition, completely retention of the MBR ponds to activated sludge is conducive to
Longer microorganism enrichment generation time, such as nitrifier and metazoa, contribute to realizing the nitrification and residue of ammonia nitrogen in water inlet
The removal of COD；The high-nitrate state nitrogen water outlet of MBR ponds realizes denitrification process by sulfur autotrophic denitrification filter tank, sulfur autotrophic denitrification be
Thiobacillus denitrificanss are enriched with sulfur grain, using elemental sulfur as electron donor, nitrate nitrogen realizes nitrate nitrogen to the autotrophic bacteria as receptor
Remove.
The biological adsorption section operational effect of embodiment 2
As shown in figs. 2 to 4, the concentration range of sewage-treatment plant water inlet total nitrogen is 25.4-46.7mg/L, and meansigma methodss are
34.6mg/L, the overwhelming majority is ammonia nitrogen in water inlet total nitrogen, and average accounting is 85.6%；Influent COD is 198-472mg/L, averagely
It is worth for 302mg/L.Biological adsorption section control biological adsorption section hydraulic detention time (Hydraulic retention time,
HRT) be 0.5h, sludge age (Sludge retention time, SRT) be 2d, dissolved oxygen (Dissolved oxygen, DO)
Scope is 0.5-1mg/L, and mixed genetic-neural network (Mixed liquor suspended solid, MLSS) is 4000-
5000mg/L.By shorter HRT and SRT, cultivate adaptogen water environment, the prokaryotic micro-organisms of fast breeding can be realized, to
Granulating material in absorption water inlet.Therefore, biological adsorption section in water inlet COD there is good removal ability, biology is inhaled
Attached section of water outlet COD scope is 62-104mg/L, and meansigma methodss are 83mg/L, and average removal rate is 71.7%.Due to shorter HRT,
Ammonia nitrogen cannot realize effectively nitrification, and the clearance of total nitrogen is relatively low, and meansigma methodss are 17%.
Additionally, biological adsorption technique can be transferred to the partial organic substances in water inlet in biological adsorption section sludge, such as Fig. 5
Shown, this section of sludge content of organic matter compares that seed sludge is significantly raised, the aggregation of particulate organic matter in mostly intaking, profit
In anaerobic fermentation/digestion.The recycling treatment mode such as volatile acid or methane phase is produced using anaerobic fermentation, can really be promoted at sewage
The comprehensive utilization of resources of reason industry.
The operation of the sewage-treatment plant of embodiment 3
The sewage-treatment plant of operation embodiment 1, with embodiment 2, control sedimentation tank HRT is biological adsorption section response parameter
3h.The membrane flux for controlling MBR is 10L/m2.h, HRT is 7h, and SRT is 20d, and DO scopes are 5-7mg/L, and MLSS maintains 6500-
8000mg/L.The HRT in sulfur autotrophic denitrification pond is 2.7h, and filler sulfur particle diameter is 2-4mm, and porosity is 50%.
As shown in fig. 6, the concentration range in water inlet total nitrogen is 25.4-46.7mg/L (meansigma methodss are 34.6mg/L), intake
The average accounting of ammonia nitrogen is 85.6% in total nitrogen, when influent COD is 198-472mg/L (meansigma methodss are 302mg/L), sewage disposal dress
It is 0-4.3mg/L to put water outlet ammonia nitrogen scope, and meansigma methodss are 2.1mg/L, realize good Nitrification；Water outlet total nitrogen meansigma methodss
For 6mg/L, show that sulfur autotrophic denitrification filter tank nitrate nitrogen removal effect is notable, realize better than one under the conditions of the HRT of 2.7h
The water outlet of level A standards, while whole water treatment technology HRT is shortened carbon source is saved.Abundant microbial population makes MBR pair
There is preferable removal effect in rest COD, the scope of water outlet COD is 16-48mg/L, and meansigma methodss are 37mg/L, better than one-level A mark
The accurate emission request for COD.
Although the present invention is disclosed as above with preferred embodiment, it is not limited to the present invention, any to be familiar with this skill
The people of art, without departing from the spirit and scope of the present invention, can do various changes and modification, therefore the protection model of the present invention
Enclosing should be by being defined that claims are defined.
Claims (9)
1. a kind of sewage-treatment plant, it is characterised in that including biological adsorption pond, sedimentation tank, MBR ponds and sulfur autotrophic denitrification
Pond, the biological adsorption pond is connected with water inlet；The sedimentation tank is in inverted cone, and bottom is bi-directionally connected with biological adsorption pond, on
Portion is connected with MBR ponds；The MBR ponds are connected with sulfur autotrophic denitrification pond；The sulfur autotrophic denitrification pond arranges outlet.
2. sewage-treatment plant according to claim 1, it is characterised in that the biological adsorption pond, sedimentation tank, MBR ponds
It is 1 with sulfur autotrophic denitrification pond dischargeable capacity:8:14:3.2.
3. sewage-treatment plant according to claim 1, it is characterised in that the MBR ponds adopt 0.02 μm of Flat Membrane.
4. sewage-treatment plant according to claim 1, it is characterised in that the sulfur autotrophic denitrification filter tank is bottom-up
Including supporting layer, denitrogenation layer；The support layer height is 10cm, is made up of coarse sand granule of the particle diameter for 5-10mm；The denitrogenation layer
Filler is elemental sulfur, and packing material size is 2-4mm, porosity 50%.
5. application of the arbitrary sewage-treatment plant of Claims 1 to 4 in advanced nitrogen.
6. a kind of method of advanced nitrogen, it is characterised in that using the sewage-treatment plant described in claim 1, make sewage elder generation
Particulate matter or Organic substance are removed through biological adsorption pond, then through sedimentation tank precipitation, then in MBR ponds and sulfur autotrophic denitrification pond
Carry out advanced nitrogen.
7. method according to claim 6, it is characterised in that methods described is the control biological adsorption tank waterpower time of staying
For 0.5h, sludge age is 2d, DO 0.5-1mg/L, mixed genetic-neural network 4000-5000mg/L.
8. method according to claim 6, it is characterised in that methods described is to control membrane flux for 10L/m2H, MBR pond
Hydraulic detention time be 7h, sludge age is 20d, DO scopes 5-7mg/L, mixed genetic-neural network 6500-8000mg/
L.
9. method according to claim 7, it is characterised in that methods described is that control sulfur autotrophic denitrification filter tank waterpower is stopped
Stay 2.5～3h of time.
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|---|---|---|---|
| CN201610878550.2A CN106565055A (en) | 2016-09-30 | 2016-09-30 | Deep nitrogen removal method for sewage |
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| CN201610878550.2A CN106565055A (en) | 2016-09-30 | 2016-09-30 | Deep nitrogen removal method for sewage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110117124A (en) * | 2018-02-07 | 2019-08-13 | 深圳市深水生态环境技术有限公司 | The landfill leachate full dose further treatment technique technique up to standard and method and system of concentrate are not produced |
| CN110776098A (en) * | 2018-07-30 | 2020-02-11 | 东莞市台腾环保材料科技有限公司 | Wastewater treatment process for rapidly treating low-concentration pollutants |
| CN112174440A (en) * | 2020-10-19 | 2021-01-05 | 张家港市五湖新材料技术开发有限公司 | Heavy metal wastewater treatment process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1884151A (en) * | 2006-06-24 | 2006-12-27 | 中国科学技术大学 | Bio-treatment method for dephosphorization and denitrogenation of sewage |
| CN102642981A (en) * | 2012-04-17 | 2012-08-22 | 清华大学 | Denitrification dephosphorization device |
| CN104071892A (en) * | 2014-06-06 | 2014-10-01 | 中山大学 | Sulfur autotrophic denitrification granule sludge as well as preparation method and application thereof |
| CN204417293U (en) * | 2015-01-26 | 2015-06-24 | 冯祥军 | A kind of denitrification dephosphorization apparatus |
-
2016
- 2016-09-30 CN CN201610878550.2A patent/CN106565055A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1884151A (en) * | 2006-06-24 | 2006-12-27 | 中国科学技术大学 | Bio-treatment method for dephosphorization and denitrogenation of sewage |
| CN100494102C (en) * | 2006-06-24 | 2009-06-03 | 中国科学技术大学 | Bio-treatment method for dephosphorization and denitrogenation of sewage |
| CN102642981A (en) * | 2012-04-17 | 2012-08-22 | 清华大学 | Denitrification dephosphorization device |
| CN104071892A (en) * | 2014-06-06 | 2014-10-01 | 中山大学 | Sulfur autotrophic denitrification granule sludge as well as preparation method and application thereof |
| CN204417293U (en) * | 2015-01-26 | 2015-06-24 | 冯祥军 | A kind of denitrification dephosphorization apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 李孟等: "《给水处理原理》", 31 December 2013 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110117124A (en) * | 2018-02-07 | 2019-08-13 | 深圳市深水生态环境技术有限公司 | The landfill leachate full dose further treatment technique technique up to standard and method and system of concentrate are not produced |
| CN110776098A (en) * | 2018-07-30 | 2020-02-11 | 东莞市台腾环保材料科技有限公司 | Wastewater treatment process for rapidly treating low-concentration pollutants |
| CN112174440A (en) * | 2020-10-19 | 2021-01-05 | 张家港市五湖新材料技术开发有限公司 | Heavy metal wastewater treatment process |
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