CN108773972A - The method that depth carbon and nitrogen removal is realized using half short distance nitration-anaerobic ammoxidation-electroxidation Treating Municipal Sewage factory sludge-digestion liquid - Google Patents

The method that depth carbon and nitrogen removal is realized using half short distance nitration-anaerobic ammoxidation-electroxidation Treating Municipal Sewage factory sludge-digestion liquid Download PDF

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CN108773972A
CN108773972A CN201810559093.XA CN201810559093A CN108773972A CN 108773972 A CN108773972 A CN 108773972A CN 201810559093 A CN201810559093 A CN 201810559093A CN 108773972 A CN108773972 A CN 108773972A
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sbr
nitrogen
sludge
digestion liquid
water
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CN108773972B (en
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吴莉娜
梁大为
沈明玉
李志�
李俊佟
尚添顺
张家鏐
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Beihang University
Beijing University of Civil Engineering and Architecture
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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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1263—Sequencing batch reactors [SBR]
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1205—Particular type of activated sludge processes
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • C02F2001/46138—Electrodes comprising a substrate and a coating
    • C02F2001/46142—Catalytic coating
    • 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

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  • Hydrology & Water Resources (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Biodiversity & Conservation Biology (AREA)
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  • General Chemical & Material Sciences (AREA)
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  • Water Treatment By Electricity Or Magnetism (AREA)
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Abstract

Sludge-digestion liquid removal of carbon and nitrogen technical field is belonged to using the method that half short distance nitration-anaerobic ammoxidation-electroxidation Treating Municipal Sewage factory sludge-digestion liquid realizes depth carbon and nitrogen removal.By realizing that Anammox then realizes that sludge nitrification liquid autotrophic denitrification, the not additional outer carbon source of the present invention realize that the ammonia nitrogen of sludge-digestion liquid and the depth of total nitrogen remove by Anammox in SBR；The hardly degraded organic substance in sludge-digestion liquid is removed by electroxidation depth, realizes advanced nitrogen, to solve the problems, such as that it is again high that sludge-digestion liquid merging treatment reduces sewage disposal plant effluent water quality, independent processing cost.It is combined by SBR-EO, Anammox denitrogenation is realized in sbr reactor device, be discharged in electro-oxidation reactor and hard-degraded substance is degraded by generating the strong hydroxyl radical free radical of oxidisability on anode, realize the economical and efficient carbon and nitrogen removal of sludge-digestion liquid.Organic matter, total nitrogen and the ammonia nitrogen concentration of final outflow water are only 60~80,8~12 and 20~30mgL-1, and each removal rate of organic matter, total nitrogen and ammonia nitrogen is up to 95% or more.

Description

Disappeared using half short distance nitration-anaerobic ammoxidation-electroxidation Treating Municipal Sewage factory sludge Change the method that liquid realizes depth carbon and nitrogen removal
Technical field
The present invention relates to a kind of methods of sludge-digestion liquid advanced treating, belong to sludge-digestion liquid removal of carbon and nitrogen technology neck Domain.This technique is equipped with raw water water tank, sequencing batch reactor (SBR) and electroxidation (EO) device, by being equipped with aeration dress in SBR It sets and mechanical stirring device.By realizing that Anammox then realizes that sludge nitrification liquid autotrophic denitrification, water outlet flow through in SBR Electroxidation device realizes that depth removes carbon.The present invention is suitable for the processing of the depth carbon and nitrogen removal of sludge-digestion liquid, not additional outer carbon Realize that the ammonia nitrogen of sludge-digestion liquid and the depth of total nitrogen remove by Anammox in source；Sludge is removed by electroxidation depth to disappear Change the hardly degraded organic substance in liquid, realizes advanced nitrogen.
Background technology
Sludge-digestion liquid is containing behavior of high-strength ammonium (500-2500mg/L) and organic matter (1000-2000mg/L), carbon Nitrogen handles very difficult a kind of sewage than very low (less than 2).This part of contaminated water is mostly flowed back into sewage disposal system at present Merging treatment, but this will increase the pollutant burden of sewage disposal system and reduce effluent quality, to greatly increase sewage The cost of processing.Therefore it is individually to handle for the better method of such sewage.However, individually handling the technique of sludge-digestion liquid Study less, existing traditional denitrification process such as A2/ O techniques are usually present carbon source deficiency when handling sludge-digestion liquid, need Add that a large amount of inorganic carbon sources are of high cost and the bad problem of denitrification effect, and its lower carbon-nitrogen ratio is also highly detrimental to biology Denitrogenation.
Traditional biological denitrification process be typically under conditions of aeration, by nitration reaction by mineralized nitrogen be nitre state Nitrogen；Again under anoxic conditions, nitrate nitrogen is converted to nitrogen.And short distance nitration is to realize mineralized nitrogen using less dissolved oxygen For nitrite nitrogen, then under anoxic conditions, nitrite nitrogen denitrification is nitrogen, to realize denitrogenation；This method is more de- than tradition Nitrogen technology saves 40% carbon source and 25% aeration quantity.
Denitrogenation mode more more effective than both techniques is Anammox (anaerobic ammonium Oxidation, ANAMMOX) denitrogenation technology.Anammox technology refer under anoxic conditions, first by half short distance nitration, It is nitrite nitrogen to make part mineralized nitrogen, and ammonia nitrogen and nitrite nitrogen, which react, later generates nitrogen.This process is de- with tradition Nitrogen technology is compared, be not required to additional carbon and meanwhile save 62.5% aeration quantity, cell yield is low, and sludge yield only has tradition de- The 15% of nitrogen technique.For the low sewage of this C/N of sludge-digestion liquid, if can be not added with or can be greatly at reduction less plus if carbon source Manage cost.Therefore, this emerging efficient denitrification technology-Anammox is very suitable for handling the low sewage such as sludge of C/N Digestive juice.Meanwhile sludge-digestion liquid contains certain density ammonia nitrogen, therefore ensure that there be proper dissociate in system Ammonia density, when the concentration of free ammonia is in 10-160mg/L, ammonia oxidizing bacteria (ammonia oxidation bacteria, AOB) It can be suppressed；And when the concentration of free ammonia is in 0.1-1mg/L, nitrite-oxidizing bacterium (nitrite oxidation bacteria, NOB it) will be suppressed, therefore be easy to realize in the Sewage Biological Treatment of relatively high-concentration ammonia-nitrogen by the inhibition of free ammonia Short distance nitration then creates conditions for Anammox.
For sludge-digestion liquid, usually also the organic matter containing 1000-2000mg/L, these organic matters are largely Hard-degraded substance it is difficult to be biodegradable again, therefore can cause effluent quality not up to standard.For refractory organic compounds, electric oxygen The advantages of change technology itself, makes it be readily applicable to handle the substance.The material property of the face coat of usual anode can direct shadow Ring treatment effect.Generally use stannic oxide, ruthenium titanium coating or Pt etc..After being passed through power supply, under the function of current, in anode table Surface catalysis coating will produce strong oxidizer hydroxyl radical free radical, so as to aoxidize hardly degraded organic substance.
This technique is combined using SBR-EO, realizes that Anammox denitrogenation, water outlet are anti-in electroxidation in sbr reactor device It answers in device and hard-degraded substance is degraded by generating the strong hydroxyl radical free radical of oxidisability on anode, realize the economy of sludge-digestion liquid Efficient carbon and nitrogen removal.
Therefore be based on the above research background, this experiment using the sludge-digestion liquid in the sewage treatment plant of Beijing as research object, Electricity is passed through by short distance nitration-anaerobic ammoxidation advanced nitrogen using the low sludge-digestion liquid of SBR-EO process carbon-nitrogen ratios Oxidation depth removes carbon.Aeration realizes half short distance nitration in SBR techniques, later anoxia stirring residue ammonia nitrogen and the production of half short distance nitration Raw nitrite nitrogen carries out Anammox, and then water outlet removes hardly degraded organic substance by electroxidation, not to being thrown in system In the case of adding carbon source, the depth carbon and nitrogen removal of sludge-digestion liquid difficult to deal with is realized.
Invention content
It is an object of the invention to the technological difficulties for existing sludge-digestion liquid, structure technological process is simple, invests Run the low sludge digestion liquor treating process of processing cost.Using the practical sludge-digestion liquid in Beijing municipal sewage plant as place Object is managed, realizes the carbon and nitrogen removal of economical and efficient and to the wherein influence of half short distance nitration and Anammox and governing factor It is furtherd investigate, the influence to electroxidation current strength and current density to treatment effect is furtherd investigate, clear best Technological parameter and treatment efficiency.Half short distance nitration-anaerobic ammoxidation, that is, one-part form Anammox is realized by SBR techniques, no Any carbon source advanced nitrogen need to be added, solving this kind of high-ammonia-nitrogen sewage denitrification of previous processing sludge-digestion liquid needs largely Add carbon source critical issue of high cost.Replace " embrane method " process hardly degraded organic substance using electro-oxidation processes, using not Same current strength carries out three-dimensional fluorescence analysis to hardly degraded organic substance simultaneously, and the up to standard of sludge-digestion liquid is realized with least cost Discharge.
High ammonia nitrogen and the low sewage disposal of carbon-nitrogen ratio are the composite can be widely applied to, especially suitable for municipal sewage plant The independent processing of sludge-digestion liquid.
Technical scheme of the present invention：
Half short distance nitration-anaerobic ammoxidation-electroxidation Treating Municipal Sewage factory the sludge-digestion liquid that the present invention designs, it is special Sign is：
Including water tank inlet (I), SBR (II), intermediate pool (III), electroxidation device EO (IV)；
Water tank inlet is equipped with outlet pipe (2), and each cycle of operation of SBR (II) is：Raw water is from water inlet cell compartment (1) by going out Water pipe (2) is driven into through SBR (II) intake pump (3) and SBR (II) water inlet pipe (4) in SBR (II), and the volume of water inlet is SBR (II) 10%-50% of effective volume；After water inlet end, aerator is opened, air passes through air compressor machine (9) and gas flow meter (10) it enters in SBR (II), passes through gas flowmeter (10) after the aeration head (12) and in aeration tube (11) and SBR (II) By DO controls to 0.5-1mg/L.SBR (II) is equipped with online pH and dissolved oxygen (DO) monitoring device (5), real time on-line monitoring SBR (II) pH in and DO, to judge reactiveness；When ammonia nitrogen concentration drops to 100-150mg/L in nitration reaction and nitrous state When nitrogen runs up to 100-200mg/L, stop aeration；Unlatching mechanical stirring device (6), agitator speed 50-80rmp/min, Under anoxic conditions, it is reacted by Anammox and removes ammonia nitrogen and nitrite nitrogen；When the pH curve single orders of real-time control are led Stirring is stagnated when number is by just becoming negative, then precipitates 30-50min, drains 3-5min, draining is than being 10%-50%, so far, SBR (II) a cycle of operation terminates.Wherein, the gas of generation is collected by gas-collecting pipe (7) in gas bottle (8)；SBR (II) the first discharge outlet (13), the second discharge outlet (14), third discharge outlet (15) and the 4th discharge outlet (16) and drain are equipped with (17)；
After each Periodic precipitation, SBR (II) handles water by the second discharge outlet (14) via intermediate pool (III) Water inlet pipe (18) enter in intermediate pool (III), then by the outlet pipe (19) and electroxidation device EO of intermediate pool (III) (IV) water inlet pipe (21) of intake pump (20) and EO (IV), which enters in EO (IV), carries out going for hardly degraded organic substance and coloration It removes；
EO (IV) is electrolysed using constant current charging mode, is connected to DC power supply (22), positive (23) and cathode (24) It is connect respectively with the anode (25) of EO (IV) and cathode (26) by conducting wire, anode (25) is Ti bases SnO2Coated electrode, coating Catalyst loading is in 1-5mg/cm2；It is passed through DC power supply and controls current density in 5~20mA/cm2It is electrolysed, two pole tensions In 3.5-4.5V, strong oxidizer hydroxyl radical free radical and ozone are generated in anode (25) surface catalytic layer, it can will be difficult to degrade organic Contaminant degradation makes coloration reduce；Cathode (26) uses nickel substrate, can generate hydrogen, EO (IV) in cathode (26) when reaction Side is equipped with outlet pipe (27) and outlet water control valve (28), and system water outlet is discharged by EO (IV) outlet pipe (27)；EO (IV) is most Organic matter, ammonia nitrogen and the total nitrogen concentration being discharged eventually are respectively 60~80,8~12 and 20~30mgL-1, realize carbon and nitrogen removal.
Half short distance nitration-anaerobic ammoxidation-electroxidation Treating Municipal Sewage factory the sludge-digestion liquid that the present invention designs, it is special Sign is, includes the following steps：
1.) water tank inlet is equipped with outlet pipe (2), each cycle of operation of SBR (II)：Raw water is logical from water inlet cell compartment (1) Outlet pipe (2) is crossed, is driven into SBR (II) through SBR (II) intake pump (3) and SBR (II) water inlet pipe (4), the volume of water inlet For the 10%-50% of SBR (II) effective volume；After water inlet end, aerator is opened, air passes through air compressor machine (9) and gas It is entered in SBR (II) after aeration head (12) in flowmeter (10) and aeration tube (11) and SBR (II), passes through gas flow (10) are counted to control DO to 0.5-1mg/L.SBR (II) is equipped with online pH and dissolved oxygen (DO) monitoring device (5), real-time online prison The pH and DO in SBR (II) are surveyed, to judge reactiveness；When ammonia nitrogen concentration drops to 100-150mg/L in nitration reaction and When nitrite nitrogen runs up to 100-200mg/L, stop aeration；Open mechanical stirring device (6), agitator speed 50- 80rmp/min is under anoxic conditions removed ammonia nitrogen and nitrite nitrogen by Anammox reaction；As the pH of real-time control Stirring to be stagnated when curve first derivative is by just becoming negative, then precipitates 30-50min, drains 3-5min, draining ratio is 10%-50%, So far, a cycle of operation of SBR (II) terminates.Wherein, the gas of generation is collected into gas bottle by gas-collecting pipe (7) (8) in；SBR (II) is equipped with the first discharge outlet (13), the second discharge outlet (14), third discharge outlet (15) and the 4th discharge outlet (16) And drain (17)；
2.) after each Periodic precipitation, SBR (II) handles water by the second discharge outlet (14) via intermediate pool (III) water inlet pipe (18) enters in intermediate pool (III), then by the outlet pipe (19) and electroxidation device of intermediate pool (III) The intake pump (20) of EO (IV) and the water inlet pipe (21) of EO (IV), which enter in EO (IV), carries out hardly degraded organic substance and coloration Removal；
3.) EO (IV) is electrolysed using constant current charging mode, is connected to DC power supply (22), positive (23) and cathode (24) it is connect respectively with the anode (25) of EO (IV) and cathode (26) by conducting wire, anode (25) is Ti bases SnO2Coated electrode, Coated catalysts carrying capacity is in 1-5mg/cm2；It is passed through DC power supply and controls current density in 5~20mA/cm2It is electrolysed, the two poles of the earth Voltage generates strong oxidizer hydroxyl radical free radical and ozone in 3.5-4.5V, in anode (25) surface catalytic layer, can will be difficult to degrade Organic pollutant degradation makes coloration reduce；Cathode (26) uses nickel substrate, can generate hydrogen, EO in cathode (26) when reaction (IV) side is equipped with outlet pipe (27) and outlet water control valve (28), and system water outlet is discharged by EO (IV) outlet pipe (27)；EO (IV) organic matter, ammonia nitrogen and total nitrogen concentration of final outflow water are respectively 60~80,8~12 and 20~30mgL-1, realize and remove carbon Denitrogenation.
Technical principle
The mechanism of half short distance nitration-anaerobic ammoxidation of the present invention-electro-oxidation processes Treating Municipal Sewage factory sludge-digestion liquid：
Sludge-digestion liquid has a significant impact to the operation of sewage treatment plant, ammonia nitrogen concentration therein in 500-2500mg/L, So high ammonia nitrogen concentration will have a significant impact to sewage disposal plant effluent water quality if not being pocessed.According to sludge-digestion liquid water Small, the high feature low with carbon-nitrogen ratio of ammonia nitrogen concentration is measured, using the work of half short distance nitration-anaerobic ammoxidation-electroxidation (SBR-EO) Skill individually handles sludge-digestion liquid to realize sewage disposal plant effluent water quality and reduce cost of sewage disposal.This technique uses SBR-EO combination techniques operate flexible advantage, the control achievement unit that first aeration passes through dissolved oxygen and free ammonia using SBR operations The accumulation for dividing short distance nitration to generate nitrite nitrogen then stops aeration and opens the remaining ammonia nitrogen of anoxia stirring device realization and nitrous state The Anammox of nitrogen, last electro-oxidation processes realize the depth of sludge-digestion liquid as process hardly degraded organic substance of checking on Carbon and nitrogen removal reduces processing cost and improves sewage disposal plant effluent water quality simultaneously.
The system includes water tank inlet (I), SBR (II), intermediate pool (III), electroxidation device EO (IV).Technological process Simply, easy to operate, aerating system and mechanical stirring device (6) and online pH and DO monitoring devices are equipped in wherein SBR (II) (5), real by the control of dissolved oxygen and free ammonia after aeration by the monitoring control reaction process of the On-line Control of pH and water sample Existing short distance nitration, mineralized nitrogen is nitrite nitrogen, then stops being aerated, and is mainly removed by Anammox under conditions of anoxic Remaining ammonia nitrogen and nitrite nitrogen realize advanced nitrogen.
SBR (II) water outlets enter in electroxidation (EO), and EO is equipped with anode, cathode, is circumscribed with DC power supply, Anodic It is made of titanium substrate, surface is coated with Catalytic Layer SnO2, by controlling different current densities, generated in anode surface Catalytic Layer strong Oxidant hydroxyl radical free radical and ozone, to which persistent organic pollutants be degraded.
Half short distance nitration-anaerobic ammoxidation-electro-oxidation processes Treating Municipal Sewage factory the sludge-digestion liquid that the present invention designs, The method for realizing depth carbon and nitrogen removal compared with prior art, has following advantages：
(1) new biological nitrogen removal technology of sludge-digestion liquid is individually handled.
Short distance nitration-anaerobic ammonia oxygen bioid is realized in SBR, realizes denitrification of autotrophic organism.Anammox is without adding Outer carbon source can save 62.5% aeration quantity, and cell yield is low, and sludge yield only has the 15% of traditional denitrification process.Therefore, should Technique greatly realizes the energy-saving of sludge-digestion liquid processing while improving sewage disposal plant effluent water quality.
(2) the flexible SBR-EO systems of processing mode are constructed.
This technique biology section, which uses, is very suitable for handling small water and the flexible SBR system of the method for operation, and the device is non- Often it is suitable for handling the small feature of the water of sludge-digestion liquid, while short distance nitration-anaerobic ammoxidation technique is also very suitable for dirt The feature that mud digestive juice ammonia nitrogen concentration is high, carbon-nitrogen ratio is low, and flexible operation, take up little area, energy saving and treatment effeciency it is high.
(4) it uses electroxidation to handle hardly degraded organic substance, substantially reduces processing cost.
At present for technologies such as hardly degraded organic substance generally use Fenton, bi-membrane methods, but it is high all to there is processing cost Problem.Can sewage treatment plant can not be born if the processing cost of sludge-digestion liquid is too high, therefore using at electroxidation method Hardly degraded organic substance is managed, hardly degraded organic substance can be handled by the cost of the electricity of very little, sewage treatment plant is greatly improved and go out Water water quality.
Description of the drawings
Fig. 1 is to realize depth using half short distance nitration-anaerobic ammoxidation-electroxidation Treating Municipal Sewage factory sludge-digestion liquid The schematic device of carbon and nitrogen removal
I-water tank inlet, II-SBR, III-intermediate pool, IV-electroxidation device EO；
I-water tank inlet：1- cell compartments
Ⅱ-SBR：2-SBR (II) outlet pipe, 3-SBR (II) intake pump, 4-SBR (II) water inlet pipe, 5-pH and DO monitorings are set It is standby, 6- mechanical stirring devices, 7- gas-collecting pipes, 8- gas bottles, 9- air compressor machines, 10- gas flowmeters, 11- aeration tubes, 12- Aeration head, the first discharge outlet of 13-, the second discharge outlet of 14-, 15- third discharge outlet, the 4th discharge outlet of 16-, 17- drains.
III-intermediate pool：The water inlet pipe of 18- intermediate pools (III), the outlet pipe of 19- intermediate pools (III)；
IV- electroxidation devices EO：The intake pump of 20-EO (IV), the water inlet pipe of 21-EO (IV), 22- external direct current power supplies, 23- DC power anodes, 24- DC power cathodes, 25- anodes, 26- cathodes, 27-EO (IV) outlet pipe, 28-EO (IV) water outlets Control valve.
Specific implementation mode
In conjunction with example：Experimental water is derived from the untreated sludge-digestion liquid of Beijing sewage treatment plant, and water quality is as follows： CODcr is 2800-3000mgL-1, NH4 +- N is 2000-2500mgL-1, NOx -- N is 0.1-5mgL-1, TN 2900- 3100mg·L-1, TP 20-40mgL-1。
Conventional water quality index is all made of national standard method measurement.TN and TOC etc. is using TN/TOC analyzers (Multi N/ C3000, Jena, Germany).
It is as follows as shown in Figure 1, the present invention individually handles sludge-digestion liquid：
1.) sludge-digestion liquid passes through outlet pipe (2) from water tank inlet (I) cell compartment (1), passes through the intake pump (3) of SBR (II) And SBR (II) water inlet pipe (4) is driven into SBR (II), the volume of water inlet is the 10%-50% of SBR (II) effective volume, Each cycle of operation of SBR (II) is：Raw water from water inlet cell compartment (1) by outlet pipe (2), through SBR (II) intake pump (3) and SBR (II) water inlet pipe (4) is driven into SBR (II)；After water inlet end, open aerator, air by air compressor machine (9) and It is entered in SBR (II) after aeration head (12) in gas flowmeter (10) and aeration tube (11) and SBR (II), passes through gas Flowmeter (10) controls DO to 0.5-1mg/L.It is real-time by the online pH and dissolved oxygen (DO) monitoring device (5) of SBR (II) PH and DO is monitored on-line, to judge reactiveness；It is primary at interval of 1h samplings, research and application is carried out to wherein water quality index, When ammonia nitrogen concentration drops to 100-150mg/L in nitration reaction and nitrite nitrogen runs up to 100-200mg/L, stops aeration；It opens Mechanical stirring device (6) is opened, agitator speed 50-80rmp/min, under anoxic conditions, being reacted by Anammox will Ammonia nitrogen and the removal of nitrite nitrogen depth；Stirring is stagnated when the pH curve first derivatives of real-time control are by just becoming negative, is then precipitated 30-50min drains 3-5min, and draining is than being 10%-50%, and so far, a cycle of operation of SBR (II) terminates.Wherein, it produces Raw gas is collected by gas-collecting pipe (7) in gas bottle (8)；The water outlet of SBR (II) is arranged by the second discharge outlet (14) Go out；
2.) after each Periodic precipitation, SBR (II) handles water by the second discharge outlet (14) via intermediate pool (III) water inlet pipe (18) enters in intermediate pool (III), then by the outlet pipe (19) and electroxidation device of intermediate pool (III) The intake pump (20) of EO (IV) and the water inlet pipe (21) of EO (IV), which enter, carries out hardly degraded organic substance and coloration etc. in EO (IV) Removal；
3.) EO (IV) is electrolysed using constant current charging mode, is connected to DC power supply (22), positive (23) and cathode (24) it is connect respectively with the anode (25) of EO (IV) and cathode (26) by conducting wire, anode (25) is Ti bases SnO2Coated electrode, Coated catalysts carrying capacity is in 1-5mg/cm2；It is passed through DC power supply and controls current density in 8,10 and 12mA/cm2It is electrolysed, Two pole tensions generate strong oxidizer hydroxyl radical free radical and ozone in 3.5-4.5V, in anode (25) surface catalytic layer, can will be difficult Degradable organic pollutant is degraded, and coloration is made to reduce；Cathode (26) uses nickel substrate, can generate hydrogen in cathode (26) when reaction Gas, EO (IV) side are equipped with outlet pipe (27) and outlet water control valve (28), and system water outlet is discharged by EO (IV) outlet pipe (27)； The organic matter, ammonia nitrogen and total nitrogen concentration of EO (IV) final outflow water are respectively 60~80,8~12 and 20~30mgL-1, realization removes Carbon denitrogenation.
Continuous experiment the result shows that：
Raw sewage digestive juice CODcr is 2800-3000mgL-1, NH4 +- N is 2000-2500mgL-1, NOx -- N is 0.1-5mg·L-1It is 2900-3100mgL with TN-1When, through more than half short distance nitration-anaerobic ammoxidation-electroxidation (SBR-EO) After process, organic matter, total nitrogen and the ammonia nitrogen concentration of final outflow water are only 60,8 and 28mgL-1, realize 98%, 99.6% With the removal rate i.e. realization economical and efficient degradation of 99% organic matter, ammonia nitrogen and total nitrogen.

Claims (1)

1. realizing that depth is de- except carbon using half short distance nitration-anaerobic ammoxidation-electroxidation Treating Municipal Sewage factory sludge-digestion liquid The method of nitrogen, which is characterized in that include the following steps：
1.) water tank inlet is equipped with outlet pipe (2), each cycle of operation of SBR (II)：Raw water is from water inlet cell compartment (1) by going out Water pipe (2) is driven into through SBR (II) intake pump (3) and SBR (II) water inlet pipe (4) in SBR (II), and the volume of water inlet is SBR (II) 10%-50% of effective volume；After water inlet end, aerator is opened, air passes through air compressor machine (9) and gas flow meter (10) it enters in SBR (II), passes through gas flowmeter (10) after the aeration head (12) and in aeration tube (11) and SBR (II) By DO controls to 0.5-1mg/L；SBR (II) is equipped with online pH and dissolved oxygen (DO) monitoring device (5), real time on-line monitoring SBR (II) pH in and DO, to judge reactiveness；When ammonia nitrogen concentration drops to 100-150mg/L in nitration reaction and nitrous state When nitrogen runs up to 100-200mg/L, stop aeration；Unlatching mechanical stirring device (6), agitator speed 50-80rmp/min, Under anoxic conditions, it is reacted by Anammox and removes ammonia nitrogen and nitrite nitrogen；When the pH curve single orders of real-time control are led Stirring is stagnated when number is by just becoming negative, then precipitates 30-50min, drains 3-5min, draining is than being 10%-50%, so far, SBR (II) a cycle of operation terminates；Wherein, the gas of generation is collected by gas-collecting pipe (7) in gas bottle (8)；SBR (II) the first discharge outlet (13), the second discharge outlet (14), third discharge outlet (15) and the 4th discharge outlet (16) and drain are equipped with (17)；
2.) after each Periodic precipitation, SBR (II) handles water by the second discharge outlet (14) via intermediate pool (III) Water inlet pipe (18) enters in intermediate pool (III), then by the outlet pipe (19) and electroxidation device EO (IV) of intermediate pool (III) Intake pump (20) and the water inlet pipe (21) of EO (IV) enter in EO (IV) removal for carrying out hardly degraded organic substance and coloration；
3.) EO (IV) is electrolysed using constant current charging mode, is connected to DC power supply (22), positive (23) and cathode (24) point It is not connect with the anode (25) of EO (IV) and cathode (26) by conducting wire, anode (25) is Ti bases SnO2Coated electrode, coating are urged Agent carrying capacity is in 1-5mg/cm2；It is passed through DC power supply and controls current density in 5~20mA/cm2It is electrolysed, two pole tensions exist 3.5-4.5V generates strong oxidizer hydroxyl radical free radical and ozone, by persistent organic pollutants in anode (25) surface catalytic layer Degradation, makes coloration reduce；Cathode (26) uses nickel substrate, can generate hydrogen in cathode (26) when reaction, EO (IV) side is set There are outlet pipe (27) and outlet water control valve (28), system water outlet to be discharged by EO (IV) outlet pipe (27).
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