CN105084686B - Sanitary production method for recycling residual activated sludge in sewage treatment plant - Google Patents
Sanitary production method for recycling residual activated sludge in sewage treatment plant Download PDFInfo
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Abstract
Disclosed is a sanitary production method for recycling residual activated sludge in a sewage treatment plant. The method comprises the steps that residual activated sludge in a secondary sedimentation tank of the urban sewage treatment plant is naturally sedimented to reach the sludge sedimentation ratio of 50-60% and then directly added into an aeration stirring tank through no pretreatment, aeration stirring treatment is performed for 110-120 h, and then natural sedimentation is performed; 2, a supernate obtained through natural sedimentation is drained into an MAP sedimentation reactor, the P/Mg/N molar ratio is adjusted to be 1/1.2/1 by adding a magnesium salt solution and a phosphor salt solution, the pH value of a reaction solution is adjusted to be 8.9+/-0.1 through 5M NaOH, a supernate obtained after sedimentation is drained into an anaerobic adjusting tank, and generated sediments are discharged into a separation recycling device; 3, sedimentation bottom mud obtained after natural sedimentation in the step 1 is discharged into the anaerobic adjusting tank, a supernate obtained after MAP sedimentation in the step 2 is drained into the anaerobic adjusting tank, and then further fermentation is performed to produce methane and recycle energy. Operation is convenient and easy to implement, no new chemical substances are introduced, follow-up slurry anaerobic digestion treatment is facilitated, and the recycling cost of phosphorus resources and energy is low.
Description
Technical field
The present invention relates to the clean preparation method that a kind of sewage treatment plant residual active sludge is recycled, realizes sewage disposal
Factory recycles target to residual active sludge, belongs to mud and sewage and processes and resource technology field, is a kind of clean manufacturing
New technique.
Background technology
The annual dewatered sludge yield of China's urban wastewater treatment firm is about 300,000 tons, and annual with about 10% speed
Increase, which processes disposal costs and accounts for the 25%～40% of sewage treatment plant's overall running cost.But China's excess sludge processes level
Fall behind many, domestic to possess the sewage treatment plant of stabilized sludge treatment facility less than 1/4, city than sewage disposal technology level
The process of town sewage plant sludge has become great environmental problem urgently to be resolved hurrily during China's modernization construction with disposing.But
Be the content of organics in activated sludge in 60%-75%, more than 40%, phosphorus accounts for mud dry weight to biological degradable organic component
5.0%, contain great resource in content more horn of plenty about 9.3%, therefore activated sludge of nitrogen.But how by which
Recycling is one of technical bottleneck problem of current sewage treatment plant.
The method commonly used in recycling sludge minimizing is processed at present has the method for adding acid, alkali or ozone.Conventional
Acid, alkaloid substance are HCI and NaOH solution respectively, and the two can be effectively facilitated sludge and melt born of the same parents' release nitrogen phosphorus, to sludge reduction
There is good effect, but the treatment fluid colourity of sour, alkali is very heavy.Chinese invention patent " sludge carbon source two-stage alkaline hydrolysis acidizing
Recovery method "（CN101708932B）, " alkaline hydrolysis pretreatment-ammonium phosphate magnesium processes reclaim phosphorus nitrogen-anaerobic digestion to Chinese invention patent
The method that methanogenic integrated technique processes excess sludge "（201310708860.6）In use alkaline hydrolysis processing method, but Jing
Cross supernatant after 5%NaOH processes sludge and pitchy is presented；And substantial amounts of Na+、OH-Cause supernatant salinity big, can increase follow-up
Effluent color dilution, salinity are processed, is unfavorable for discharged wastewater met the national standard.10%HCI treatment fluids are presented isabelline, and acid treatment supernatant
In contain substantial amounts of CI- ions.So acid-alkali treatment method all introduces new polluter in the processing system, it is unfavorable for follow-up
Further anaerobic digestion methane phase reclaim biomass energy.And Ozone is currently used primarily in waste water tertiary treatment, and Ozone
Equipment disposably input is big, processing procedure high energy consumption, therefore processing cost can be increased considerably.
Inventor find in sludge-tank by settling ratio for 50-60% sludge after the Air Exposure of certain hour, on
Clear liquid ammonia nitrogen, dissolved phosphorus concentration higher than acid, in alkali process liquid nitrogen phosphorus concentration, aeration causes sludge lysis release nitrogen phosphorus and can
Soluble organism（SCOD）Phenomenon.Therefore it is of the invention by Sewage Plant mud storage pool（Or sludge concentration tank）Structure of modification is carried out, is pacified
Dress aeration and agitating device, increase contact-impact probability between mud granule by the particular design to agitating device and alr mode
And extruding force, further crack mud granule lysis with the shearing force collective effect of aeration formation, reach sludge extracellular polymer
Thing peels off the purpose that cell breakage discharges nitrogen phosphorus.For after aeration agitation, supernatant is " a kind of to useless further with Chinese patent
Water nitrogen phosphorus carries out the device of guanite resource recovery "（201420458242.0）MAP precipitations to producing are sharp as slow-release fertilizer
With by the further anaerobic fermentation methane phase recovery energy of sludge after recovery of nitrogen and phosphorus.As aeration agitation discharges sludge lysis
The SCOD such as more protein, polysaccharide, so anaerobic methane production efficiency improves 10-15% than usual sewage plant sludge anaerobism.This
It is sharp again that the bright technology path by " aeration agitation-MAP precipitations-anaerobic fermentation " carries out resource energy to residual active sludge
With, compensate for alkaline hydrolysis technique and cause sludge pH height to be unfavorable for the technological deficiency of follow-up anaerobic fermentation, particularly sludge process exposes
Nitrogen, phosphorus concentration are discharged after gas agitating process suitable with nitrogen in alkaline hydrolysiss, phosphorus maximum release concentration, be a kind of clean and effective from sludge
The new technique of middle Resource recovery and the energy.
Compared with other processing systems, the present invention is by reaching the mesh that sludge is recycled to the transformation of Sewage Plant existing utility
Mark, it is easy to operate, new chemical substance is not introduced, with acid, alkali process liquid phase ratio, the treatment fluid and raw sewage of air is exposed
Color is close, is conducive to follow-up anaerobic sludge digestion to process, and nitrogen phosphor resource reduces about 10-20% with the recovery of the energy and operates into
This, reaches the target that Sewage Plant implements clean manufacturing.
The content of the invention
Problem, the present invention is recycled to provide a kind of sewage treatment plant residual for current sewage treatment plant residual active sludge
The clean preparation method that activated sludge nitrogen phosphor resource energy is recycled.
Inventor has found settling ratio is reached the sludge of 50-60% after the Air Exposure of certain hour in sludge-tank,
Supernatant ammonia nitrogen, dissolved phosphorus concentration are higher than or are close to the concentration of nitrogen phosphorus in sour, alkali process liquid, and aeration causes sludge lysis to discharge
Nitrogen phosphorus and dissolved organic matter（SCOD）Phenomenon.The present invention changes sludge treatment technique route, by Sewage Plant mud storage pool（Or it is dirty
Mud thickener）Structure of modification is carried out, aeration and agitating device are installed, promoted by the particular design to agitating device and alr mode
Sludge nitrogen phosphorus substance is discharged in mixed liquor, when aeration rate 5L/L min, aeration time be 120h, sludge melt born of the same parents release ammonia
Nitrogen and dissolved phosphorus concentration respectively reach 143.2-185.3mg/L and 109.3-132.7mg/L, higher than the acid with the conditions of, alkali
The maximum release concentration 110.1-146.6mg/L of ammonia nitrogen, the release concentration 115.18- with dissolved phosphorus in facture
It 125.43mg/L is close to.Further utilize the MAP sedimentation method and Chinese patent " a kind of to carry out guanite resource to phosphorus in waste water nitrogen
Change the device for reclaiming "（201420458242.0）This nitrogen phosphorus is reclaimed and is utilized as slow-release fertilizer, the response rate of ammonia nitrogen is 86-
95%, the response rate of dissolved phosphorus is 90-99%, and response rate 30-45% to sludge total nitrogen phosphorus is above alkaline hydrolysis handling process.Will
The further anaerobic fermentation methane phase of sludge after recovery of nitrogen and phosphorus reclaims the energy.Final discharge volume reduces 50-60%, nitrogen phosphor resource
Recovery with the energy reduces about 10-20% running costs, realizes the theory of sewage treatment plant's clean manufacturing.
Based on above-mentioned, the clean preparation method that a kind of sewage treatment plant residual active sludge of present invention offer is recycled, should
Method includes：
（1）After being 50-60% by the residual active sludge natural subsidence of municipal sewage plant's second pond to sludge settling ratio
It is directly added in aeration agitation pond without any pretreatment, processes through the aeration agitation of 110-120h, then natural subsidence；
（2）Supernatant after natural subsidence is entered in MAP precipitation reactors, it is molten by adding magnesium salt solution and microcosmic salt
Liquid, adjustment P/Mg/N mol ratios 1/1.2/1, under conditions of stirring, adjust reacting solution pH value 8.9 ± 0.1 with 5MNaOH, make
In supernatant there is MAP precipitation in nitrogen phosphorus, and supernatants after precipitation is entered anaerobism regulating reservoir, and the precipitation of generation is discharged into separation
Retracting device；
（3）By step（1）Precipitation bed mud after middle natural subsidence enters anaerobism regulating reservoir, then by step（2）Middle MAP precipitations
Supernatant afterwards enters anaerobism regulating reservoir, and the alkali using sludge itself adjusts the pH value of both mixed liquors to 8.2-8.5 heel row
Enter anaerobic reactor, the methane phase that further ferments reclaims the energy.
In step（1）In, aeration rate 5L/L min, stir speed (S.S.) 150-400rpm, alr mode be per turn stop 5 within 10 seconds
Second.
In step（2）In, the concentration for determining ammonia nitrogen and dissolved phosphorus in the supernatant after natural subsidence is respectively reached
143.2-185.3mg/L and more than 109.3-132.7mg/L, SCOD are in 3300-5000mg/L, then enter MAP precipitation reactors
In.
In step（2）In, alr mode is, after 800rpm is stirred 5 minutes, to be changed to 200rpm and stir 15 minutes, stop stirring
Postprecipitation 2-3h, then supernatant is entered into anaerobism regulating reservoir.
In step（2）In, the mass percent concentration of the magnesium salt solution is 17%, and magnesium salt solution is MgCl2Solution,
MgSO4One kind in solution and MgO solution；The mass percent concentration of the microcosmic salt solution is 5%, and microcosmic salt solution is NaH2PO4
Solution, Na2HPO4Solution, Na3PO4Solution, KH2PO4Solution and K2HPO4One kind in solution.
In step（3）In, anaerobic reactor is filtered to be thoroughly mixed formula anaerobic reactor, up-flow anaerobic sludge blanket, anaerobism
Pond, anaerobic baffle reactor, anaerobic expanded granular sludge bed or Anaerobic Sequencing Bath Reactor.Reactor enters after running well every time
The solid-liquid ratio 1/3-1/5 of material, more than COD clearance 82-87%, the protein for making the release of sludge lysis more due to aeration agitation,
The SCOD such as polysaccharide, so anaerobic methane production efficiency high, improves 10-15% than usual sewage plant sludge anaerobism efficiency at 35 DEG C, it is dirty
The final discharge volume of mud reduces 50-60%.Nitrogen phosphor resource reduces about 10-20% running costs with the recovery of the energy, realizes sewage
The theory for the treatment of plant's clean manufacturing.
The present invention has following good effect：
（1）The a whole set of clearer production technology route recycled to residual active sludge is provided for sewage treatment plant, mesh is made up
The technological deficiency that front Sewage Plant is not utilized to residual active sludge.Compared with current alkaline hydrolysis technique, fully realize in sludge
The target that nitrogen phosphor resource is recycled with high efficiency of energy, and new pollutant are not introduced, with significant economic benefit, Environmental Effect
Benefit.
（2）Using Sewage Plant mud storage pool（Or sludge concentration tank）Carry out structure of modification, sludge melts the ammonia nitrogen of born of the same parents' release and molten
Solution property phosphorus concentration respectively reaches 143.2-185.3mg/L and 109.3-132.7mg/L, higher than the acid with the conditions of, alkali process method
The maximum release concentration 110.1-146.6mg/L of middle ammonia nitrogen, is connect with the release concentration 115.18-125.43mg/L of dissolved phosphorus
Closely, response rate 30-45% to sludge total nitrogen phosphorus, higher than acid, alkali pretreatment.
（3）After the present invention will stir aeration, bed mud is mixed with MAP supernatants after precipitation, is reached the purpose for adjusting pH value, is detested
After oxygen, at 35 DEG C, methane phase efficiency improves 10-15% than usual sewage plant sludge anaerobic methane production, and the final discharge volume of sludge subtracts
Few 50-70%, overcomes the technological deficiency that sludge pH height after alkaline hydrolysis is processed is unfavorable for follow-up anaerobic treatment.
（4）Jing after the technology of the present invention route processing, compared with initial residual activated sludge, VSS subtracts the sludge of final discharge
Few 80-90%, discharge volume reduce 50-60%, greatly reduce Treatment of Sludge expense, nitrogen phosphor resource and the energy than existing process
Reclaiming reduces about 10-20% running costs, realizes the theory of sewage treatment plant's clean manufacturing.
Specific embodiment
Embodiment one：
To directly add without any pretreatment after the residual active sludge natural subsidence of municipal sewage plant's second pond
Enter in aeration agitation pond, sludge settling ratio is 55%, open aerator and adjust tolerance 5L/L min, open agitating device control
Stir speed (S.S.) 300rpm, alr mode are that pulse interval type stops 5 seconds in 10 seconds per turn.Process time be respectively 12h, 24h,
Sample analysis when 48h, 72h, 90h, 110 h, 120h, 130h, determine dissolved phosphorus nitrogen concentration in supernatant, in process time
Maximum is reached during 120h, respectively 154.3mg/L and 116.4mg/L, SCOD are 3806.7mg/L.
After by this mixing liquid precipitate, water outlet is entered in MAP precipitation reactors, adds 5%Na3PO4Solution and 17%MgCl2It is molten
Liquid, makes P/Mg/N mol ratios be 1/1.2/1, adjusts reacting solution pH value 8.9 with 5MNaOH, be stirred when medicament is added,
Alr mode is after 800rpm is stirred 5 minutes, is reduced to 200rpm stirrings 15 minutes, stops stirring postprecipitation 3h, ammonia in supernatant
The response rate of nitrogen is 89%, and the response rate of dissolved phosphorus is 93.9%.To the precipitation Chinese patent 201420458242.0 for generating
" a kind of device that guanite resource recovery is carried out to phosphorus in waste water nitrogen " is separated and recovered, and measures ammoniomagnesium phosphate content in precipitation
More than 92.5%.
Bed mud after above-mentioned stirring aeration and MAP supernatants after precipitation are mixed in anaerobism regulating reservoir, mixed liquor pH value
8.37, then Anaerobic Sequencing Bath Reactor is entered, inoculation anaerobic sludge starts reactor, what reactor was fed after running well every time
Solid-liquid ratio 1/3-1/5, COD clearance more than 84%, methane high specific factor of created gase 1.17L/（g·VS）.Discharge in anaerobic reactor
Sludge finally carries out landfill disposal again after mechanical dehydration, and compared with initial residual activated sludge, VSS reduces 80-90%, row
Put volume and reduce 55%.Specific resistance to filtration expense is greatly reduced, the theory of sewage treatment plant's clean manufacturing is realized.
Sludge alkaline hydrolysis is carried out simultaneously and processes contrast experiment, take each 400ml of second pond residual active sludge and be distributed into 1000ml
In wide-mouth reagent bottle, be separately added into 5%NaOH solution, process time be respectively 12h, 24h, 48h, 72h, 90h, 110h,
120h, 130h time-division takes a small amount of alkali process liquid and which is centrifuged, and then determines Dissolve N and P concentration in supernatant
Respectively 67.5mg/L and 70.1mg/L, far below concentration of nitrogen and phosphorus in the present invention.Process 12h after alkali treatment fluid colourity very
Weight, is presented pitchy, and supernatant is close with raw sewage color in aeration agitation pond of the present invention.Contain substantial amounts of Na in alkali process+、OH-Ion causes supernatant salinity big, can increase subsequent treatment effluent color dilution, salinity, be unfavorable for discharged wastewater met the national standard.
Sludge acid treatment contrast experiment is carried out simultaneously, taking each 400ml of second pond residual active sludge, to be distributed into 1000ml wide
In opening reagent bottle, be separately added into 10%HCl solution, process time be respectively 12h, 24h, 48h, 72h, 90h, 110h, 120h,
The 130h time-divisions take a small amount of alkali process liquid and which are centrifuged, and in then determining supernatant, Dissolve N and P concentration is respectively
58.3mg/L and 106.1mg/L, far below concentration of nitrogen and phosphorus in the present invention.The pickling agent color heavy after 12h is processed, in brown Huang
Color, and supernatant is close with raw sewage color in aeration agitation pond of the present invention.Contain substantial amounts of Cl in acid treatment-Cause supernatant
Salinity is big, is unfavorable for discharged wastewater met the national standard.
The present invention is easy to operation, does not introduce new chemical substance, with acid-alkali treatment liquid phase ratio, sludge recovery of nitrogen and phosphorus
Rate is improved considerably, and eventually passes through anaerobic methane production recovery mass energy, makes the final discharge volume of sludge reduce 50-60%,
Specific resistance to filtration expense is greatly reduced, the theory of sewage treatment plant's clean manufacturing is realized.
Embodiment two：
To directly add without any pretreatment after the residual active sludge natural subsidence of municipal sewage plant's second pond
Enter in aeration agitation pond, sludge settling ratio is 60%, open aerator and adjust tolerance 5L/L min, open agitating device control
Stir speed (S.S.) 300rpm, alr mode are that pulse interval type stops 5 seconds in 10 seconds per turn.Process time be respectively 12h, 24h,
48h, 72h, 90h, 110 h, 120 h, 130 when sample analysis, determine supernatant in dissolved phosphorus nitrogen concentration, in process time
Maximum is reached during 120h, respectively 137.3mg/L and 120.5mg/L, SCOD are 3990.3mg/L.
After by this mixing liquid precipitate, water outlet is entered in MAP precipitation reactors, adds 5%Na3PO4Solution and 17%MgCl2It is molten
Liquid, makes P/Mg/N mol ratios be 1/1.2/1, adjusts reacting solution pH value 8.95 with 5MNaOH, be stirred when medicament is added,
Alr mode is after 800rpm is stirred 5 minutes, is reduced to 200rpm stirrings 15 minutes, stops stirring postprecipitation 3h, ammonia in supernatant
The response rate of nitrogen is 87.1%, and the response rate of dissolved phosphorus is 94.3%.To the precipitation Chinese patent for generating
201420458242.0 " a kind of devices that guanite resource recovery is carried out to phosphorus in waste water nitrogen " are separated and recovered, and measure precipitation
Middle ammoniomagnesium phosphate content is more than 92.9%.
Bed mud after above-mentioned stirring aeration and MAP supernatants after precipitation are mixed in anaerobism regulating reservoir, mixed liquor pH value
8.1, then Anaerobic Sequencing Bath Reactor is entered, inoculation anaerobic sludge starts reactor, what reactor was fed after running well every time
Solid-liquid ratio 1/3-1/5, COD clearance more than 86%, methane high specific factor of created gase 1.19L/（g·VS）.Sludge in anaerobic reactor
Finally landfill disposal is carried out after mechanical dehydration again, compared with initial residual activated sludge, VSS reduces 80-90%, discharges body
Product reduces 60%.Specific resistance to filtration expense is greatly reduced, the theory of sewage treatment plant's clean manufacturing is realized.
Sludge alkaline hydrolysis is carried out simultaneously and processes contrast technique, take each 800ml of second pond residual active sludge and be distributed into 2000ml
In wide-mouth reagent bottle, be separately added into 5%NaOH solution, process time be respectively 12h, 24h, 48h, 72h, 90h, 110h,
120h, 130h time-division takes a small amount of alkali process liquid and which is centrifuged, and then determines Dissolve N and P concentration in supernatant
Respectively 72.5mg/L and 68.2mg/L, far below concentration of nitrogen and phosphorus in the present invention.Process 12h after alkali treatment fluid colourity very
Weight, is presented pitchy, and supernatant is close with raw sewage color in aeration agitation pond of the present invention.Contain substantial amounts of Na in alkali process+、OH-Ion causes supernatant salinity big, can increase subsequent treatment effluent color dilution, salinity, be unfavorable for discharged wastewater met the national standard.
The present invention is easy to operation, does not introduce new chemical substance, with alkali process liquid phase ratio, sludge recovery of nitrogen and phosphorus rate
It is improved considerably, and eventually passes through anaerobic methane production and reclaim mass energy, makes the final discharge volume of sludge reduce 50-60%, pole
The earth reduces specific resistance to filtration expense, realizes the theory of sewage treatment plant's clean manufacturing.
Claims (5)
1. the clean preparation method that a kind of sewage treatment plant residual active sludge is recycled, it is characterised in that the method includes：
（1）By the residual active sludge natural subsidence of municipal sewage plant's second pond to sludge settling ratio be 50-60% after without
Cross any pretreatment to be directly added in aeration agitation pond, process through the aeration agitation of 110-120h, then natural subsidence；Aeration
Amount 5L/min, stir speed (S.S.) 300rpm, alr mode be per turn stop 5 seconds within 10 seconds；
（2）Supernatant after natural subsidence is entered in MAP precipitation reactors, by adding magnesium salt solution and microcosmic salt solution, is adjusted
Whole P/Mg/N mol ratios 1/1.2/1, under conditions of stirring, adjust reacting solution pH value 8.9 ± 0.1 with 5MNaOH, make supernatant
In liquid there is MAP precipitation in nitrogen phosphorus, and supernatants after precipitation is entered anaerobism regulating reservoir, and the precipitation of generation is discharged into separation and recovery
Device；
（3）By step（1）Precipitation bed mud after middle natural subsidence enters anaerobism regulating reservoir, then by step（2）After middle MAP precipitations
Supernatant enters anaerobism regulating reservoir, and the alkali using sludge itself adjusts the pH value of both mixed liquors and enters to 8.2-8.5 and detest
Oxygen reactor, the methane phase that further ferments reclaim the energy.
2. the clean preparation method that a kind of sewage treatment plant residual active sludge according to claim 1 is recycled, which is special
Levy and be, in step（2）In, the concentration for determining ammonia nitrogen and dissolved phosphorus in the supernatant after natural subsidence respectively reaches 143.2-
185.3mg/L and 109.3-132.7mg/L, SCOD are in 3300-5000mg/L, then enter in MAP precipitation reactors.
3. the clean preparation method that a kind of sewage treatment plant residual active sludge according to claim 1 is recycled, which is special
Levy and be, in step（2）In, alr mode is, after 800rpm is stirred 5 minutes, to be changed to 200rpm and stir 15 minutes, stop stirring
Postprecipitation 2-3h, then supernatant is entered into anaerobism regulating reservoir.
4. the clean preparation method that a kind of sewage treatment plant residual active sludge according to claim 1 is recycled, which is special
Levy and be, in step（2）In, the mass percent concentration of the magnesium salt solution is 17%, and magnesium salt solution is MgCl2Solution, MgSO4
One kind in solution and MgO solution；The mass percent concentration of the microcosmic salt solution is 5%, and microcosmic salt solution is NaH2PO4Solution,
Na2HPO4Solution, Na3PO4Solution, KH2PO4Solution and K2HPO4One kind in solution.
5. the clean preparation method that a kind of sewage treatment plant residual active sludge according to claim 1 is recycled, which is special
Levy and be, in step（3）In, anaerobic reactor is filtered to be thoroughly mixed formula anaerobic reactor, up-flow anaerobic sludge blanket, anaerobism
Pond, anaerobic baffle reactor, anaerobic expanded granular sludge bed or Anaerobic Sequencing Bath Reactor.
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| CN107445268A (en) * | 2017-09-05 | 2017-12-08 | 北京交通大学 | A kind of method that phosphorus is reclaimed from fermented pharmaceutical waste water |
| TWI657054B (en) * | 2018-08-16 | 2019-04-21 | 統一企業股份有限公司 | Activated sludge reduction and reuse method |
| CN113402115A (en) * | 2021-06-15 | 2021-09-17 | 中山大学 | Low-carbon source sewage treatment device and treatment method |
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| CN103693828B (en) * | 2013-12-20 | 2014-12-31 | 华南理工大学 | Method for processing residual sludge with integrated process of alkaline hydrolysis preprocessing, nitrogen and phosphorus recovery based on magnesium ammonium phosphate method and methane production based on anaerobic digestion |
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