CN106082428A - A kind of with the alkali leaching excess sludge BAF system as filler and operation method thereof with filler preparation method - Google Patents
A kind of with the alkali leaching excess sludge BAF system as filler and operation method thereof with filler preparation method Download PDFInfo
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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
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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
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
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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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a kind of BAF system with alkali leaching excess sludge as filler and operation method thereof and filler preparation method, belong to technical field of sewage.It includes water inlet and outlet, also include filter course, filler, microporous aeration device and back purge system, bacteria filter system is followed successively by filter course, microporous aeration device and back purge system from top to bottom, filler is filled between bacteria filter system inner filtration layer and microporous aeration device, water inlet is positioned at the top of bacteria filter system, outlet is positioned at the bottom of bacteria filter system, being confined to vacuum between the ectonexine cylinder of bacteria filter system, internal layer cartridge outer surface tightly wraps up one layer of heat preservation glass cotton；This insulation arranges and bacteria filter system can be made in the relatively low removal efficiency still winter with preferable ammonia nitrogen and phosphorus of temperature.It uses water intake mode from top to bottom, alleviates the susceptible to plugging problem of filler, realizes the target of recycling industrial waste alkaloids leaching excess sludge simultaneously.
Description
Technical field
The invention belongs to technical field of sewage, more particularly, it relates to a kind of with alkali leaching excess sludge as filler
BAF system and operation method thereof and filler preparation method.
Background technology
Along with developing rapidly of industrial or agricultural, all kinds of quantity of wastewater effluent are continuously increased, and water pollution is the most serious.Meanwhile, with
The most nitrogenous, the sanitary wastewater of phosphorus nutrition material and trade effluent enters natural water, water body eutrophication degree is deepened, sternly
Important place destroys water ecological setting, and health and hydrobiological existence are brought huge threat.
BAF (BAF) is that the high-efficiency sewage integrating biomembrane biochemistry degraded and filtering layer filtering function processes
Technology, can realize resource regeneration and sustainable utilization.BAF is bigger than the Biomass of other active sludge processing systems, volumetric loading
Height, floor space is little, and sludge yield is little, and treatment effect is stable, both may be used for the two stage treatment of sewage it can also be used to depth
Reason.But, the core component filler of BAF is susceptible to blocking in running and hardens, and adds the energy of backwash
Consumption.Temperature is on the certain impact except ammonia nitrogen and dephosphorization have of BAF system, in particular, in the winter that temperature is relatively low, low temperature be unfavorable for be
The system removal to phosphorus.
Alkali leaching excess sludge is the industrial residue that pickling mud produces after alkali soaking technology, and discharge capacity is big, belongs to industry
Garbage, processes the most rationally and effectively and utilizes such garbage to be always a urgent problem.Alkali leaching residue dirt
Mud rough surface, inside has abundant pore structure, suitable calcination condition that its microstructure can be made to increase, and water absorption rate and heap are close
Degree declines, and the loose structure of this Sludge Surface has certain specific surface area, and the attachment for microorganism is fixed and perches growth
Providing favorable environment, carrier performance is good, has certain absorption property simultaneously.According to GB5058.3-2007 " hazardous waste
Judging standard one leaching characteristic identification " measure the Leaching of Heavy Metals value of filler and organic poison leaching value, find the weight of this filler
Metal leaching value and organic poison leaching value are far below standard content limit value.Root according to research reports, with the city of general solid waste
The report that city's dirt mud as a raw material prepares water treatment filler is more, as with municipal sewage sludge and shale or with Sewage Plant dehydration dirt
Mud and clay, flyash are that filler prepared by raw material, and the research using alkali leaching excess sludge to prepare filler rarely has report.
Chinese utility model patent, application number 201520361965.3, Authorization Notice No. CN204675889U, disclose one
Plant bio-filter stuffing and there is the biofilter of this filler.This filler is hemispherical shell greenwave, has the first surface of projection
The second surface being filled with water with indent, bigger specific surface area beneficially attached growth of microorganisms forms stable biomembrane,
And a large amount of anaerobic-aerobic unit, scrubbing better performances can be formed.But, this filler and there is the biofilter of this filler in fortune
It is susceptible to the blockage problem of filler after row a period of time, and cold operation condition can reduce the removal efficiency of pollutant.In
State's patent of invention, application number: 201510727411.5, Authorization Notice No.: CN105236564A, disclose a kind of aeration and biological filter
Pond combined stuffing and application.This combined stuffing is made up of walnut shell and zeolite, and walnut shell is 2-4:1 with the volume ratio of zeolite, this
Combined stuffing biofilm speed, and the skeletal support effect of walnut shell can alleviate blocking to a certain extent.But, combination
The problem that under winter low temperature environment, pollutants removal rate is the highest cannot be avoided in filler and corresponding filter tank.
Chinese invention patent, publication number: CN 103553211A, publication date: 2014.02.05, disclose a kind of the most anti-
Stifled synchronous nitration and denitrification layering BAF, it relates to a kind of BAF.It is in order to solve existing filler ratio
Surface area is little, Biomass attachment is little, reaction efficiency low, easily blocks, and isolated system is difficult to asking of synchronous nitration and denitrification
Topic.BAF is arranged: water inlet water distribution and denitrogenation mixed zone, Jian Yang reaction zone, biofilter, aerobic zone, catchment；Institute
State aerobic area and arrange aerating pipelines and conventional particles filler；Described aerobic zone is disposed with aerating pipelines and flexible fiber ball filler.
This invention have employed flexible fiber ball filler, has that specific surface area is big, dissolved oxygen mass-transfer performance is good, biological attachment performance is good, has
Be beneficial to oxygen transmission, strengthen air water be uniformly distributed, prevent sludge blockage, beneficially nitrobacteria apposition growth, be not easily blocked
Etc. advantage, being effectively improved the Biomass of biofilter, ammonia nitrogen removal frank reaches 90%, and nitrogen removal rate reaches 85%, than tradition
BAF improves 8.5%.Its weak point: structure is more complicated, operates cumbersome, and still faces under low temperature environment dirty
The problem that dye thing clearance reduces.
Summary of the invention
1. to solve the technical problem that
Easily blocking, for filler present in prior art, the problem of filter tank system stable operation that affects, the present invention provides
A kind of with the alkali leaching excess sludge BAF system as filler and operation method thereof with filler preparation method.It alleviates
The susceptible to plugging problem of filler, realizes the target of recycling industrial waste alkaloids leaching excess sludge simultaneously.
2. technical scheme
For solving the problems referred to above, the technical scheme that the present invention provides is as follows:
A kind of with the alkali leaching excess sludge BAF system as filler, including water inlet and outlet, also include
Filter course, packing layer, microporous aeration device and back purge system, bacteria filter system is followed successively by filter course, micropore from top to bottom
Aerator and back purge system, bacteria filter system inner filtration layer and microporous aeration device are packing layer, and water inlet is positioned at life
The top of thing filter tank system, outlet is positioned at the bottom of bacteria filter system.
Preferably, bacteria filter system is PVC material column structure, and bacteria filter system includes inside and outside two-layer cylinder.
Preferably, being confined to vacuum between the ectonexine cylinder of bacteria filter system, internal layer cartridge outer surface tightly wraps up
One layer of heat preservation glass cotton；This insulation arranges and bacteria filter system can be made still to have preferable ammonia nitrogen in the winter that temperature is relatively low
Removal efficiency with phosphorus.
Preferably, the upper and lower two-stage of filter course all fills haydite, and haydite distribution is followed haydite particle diameter from top to bottom and is sequentially reduced
Rule, will be placed on the haydite that particle diameter is less by the bigger haydite of particle diameter.
As the filtrate of filter course, haydite has absorption and cuts the feature of dirty and preferable hydraulic characteristic(s), and light weight, suitably arranges
The top of tower type filter chamber in the present invention, compared with other filtrate, its resultant effect is preferable.
SS gathering in deposition and filter process is the one of the main reasons of filler blocking, uses this filling layout side
Formula, because upper strata filtrate size is relatively big, therefore can extend the assemble index in SS deposition and filter process, and then alleviate feed blocking
Problem.
Preferably, filler is filled in the packing layer between filter course and microporous aeration device, the grain of filler in packing layer
The filling design of anti-material density size is taked in footpath, it then follows the rule that from top to bottom particle diameter is sequentially reduced.
Fill material density size is different from the past to be increased successively with water (flow) direction, but takes anti-material density size
Filling design, will be placed on the filler that particle diameter is less by the bigger filler of particle diameter, and filter course haydite two-level distribution is distributed also
Following the rule that particle diameter from top to bottom is sequentially reduced, this filling arrangement can alleviate filler blockage problem, extends system stability
The effective time run.
A kind of with the preparation method of filler in the alkali leaching excess sludge BAF system as filler, the steps include:
Step one, alkali is soaked excess sludge it is washed to neutrality；Alkali leaching excess sludge rough surface is loose porous, and inside also has
The more rich pore structure of ratio, and its light weight, granule is tiny, possesses the potential quality as water treatment filler；Alkali leaching excess sludge in
Alkalescence, is unfavorable for the apposition growth of microorganism, therefore need to be washed to neutrality, and the filler of preparation is conducive to the attachment life of microorganism
Long；
Step 2, alkali leaching excess sludge grinds after drying and sieves；Reduce mud particle diameter, make pretreatment for calcining heat treatment,
To obtaining more preferable carrier performance；
Step 3, grinding is sieved after alkali leaching excess sludge at 250-280 DEG C, preheat 20-25min；Warm can
Preferably to regulate the carbon content in alkali leaching excess sludge, the beneficially formation of calcination process mesopore；
Step 4, will preheating after mud continue under the conditions of 500-600 DEG C calcine 1-2h；Excess sludge has clay
Skeleton, can form more preferable internal pore structure after calcining, mud microstructure can be made to increase, under water absorption rate and bulk density
Fall, increases the specific surface area of its loose structure, forms more pore structure, and the attachment for microorganism is fixed and perched growth and carries
For favourable spatial environments；
Step 5, by press atomization comminutor to calcining after alkali leaching excess sludge carry out pelletize process, in hermetically drying
Preserve under environment；Because this filler water absorption is preferable, the most sealed preservation of filler prepared will affect follow-up filling work,
The convenient filling with filtrate of the filler being dried.
Preparing raw material alkali leaching excess sludge is trade waste, is the Industry Waste that produces after alkali soaking technology of pickling mud
Slag, and discharge capacity is big, it is achieved the resource innoxious use of trade waste, provide new approaches for the treatment of wastes with processes of wastes against one another；
Preferably, the mean diameter of filler is 0.074-0.178mm, and in this particle size range, obtained filler has relatively
Good mobility, and can prevent filler from flying upward on the wall being attached to bacteria filter system, the utilization effect of oxygen can be improved simultaneously
Rate；Too big less than the filler adhesion of this average particle size range, and easily fly upward and be attached on wall；Higher than this average particle
The filler of footpath scope, its adhesion reduces with coherency, and mobility is deteriorated.
A kind of operation method soaking the excess sludge BAF system as filler with alkali, the steps include:
One, biofilm
Step one, first mud and secondary sedimentation tank water outlet are added in bacteria filter system simultaneously, intermittent aerating；Intermittently
Aeration makes aeration more uniform, prevents the problems such as the too high suppression nitrification brought of dissolved oxygen and sludge aging.
Discharge supernatant after step 2, standing, add sewage and mud, intermittent aerating；Intermittent aerating makes aeration more
Add uniformly, prevent the problems such as the too high suppression nitrification brought of dissolved oxygen and sludge aging.
Step 3, also aeration of intaking from water inlet, set the hydraulic detention time of BAF system；Hang through this
After mem stage, biomembrane fixed effect is preferable, difficult drop-off.
Two, backwash
After closing water inlet and outlet, open aerator and carry out 4-6min gas flushing, restart backwash pump, carry out
Air water combines flushing 4-6min, after closing aerator and backwash pump, opens water inlet and outlet.
Aerator and backwash pump are placed in outside bacteria filter system, expose in system by trachea is the most corresponding with water pipe
Gas system, backwashing system are connected.
The float that backwash can remove aging biomembrane and release is dammed, and then improve the decontamination effect of operation system
Rate, its frequency was close with prior art, for 5-7 days.
Extending the duration of system stable operation, experiment shows, the duration of congestion of traditional arrangement mode is about 28-35 days, should
Duration of congestion can be extended to 35-40 days by arrangement.
Along with the Biomass of filter material surface and the float that retains are continuously increased, it is necessary to filter tank is carried out backwash with extensive
Its disposal ability multiple, its frequency is about 5-7 days once；System stable operation for up to 35-40 days, now filler blockage problem
More serious, need to supplement according to effluent quality situation or change filler；The backwash frequency of system properly functioning period is 5-7 days one
Secondary, after BAF is completely plugged, backwash effect is little, now needs supplement according to water outlet situation or change filler.
Preferably, the aeration control of the intermittent aerating of step one is at 10-12L/h.Aeration rate in this range, both can be protected
Demonstrate,proving higher dissolved oxygen concentration, can reduce again aeration affects attachment and the growth of microorganism to washing away of filter material surface.
Preferably, the hydraulic detention time of the BAF system of step 3 is set as 5-7h.
3. beneficial effect
Compared to prior art, it is an advantage of the current invention that:
(1) alkali is soaked excess sludge and is washed to neutrality by present invention profit；Alkali leaching excess sludge rough surface is loose porous, internal
Also having the more rich pore structure of ratio, and its light weight, granule is tiny, possesses the potential quality as water treatment filler；Alkali leaching residue dirt
Mud is alkalescence, is unfavorable for the apposition growth of microorganism, therefore need to be washed to neutrality, and the filler of preparation is conducive to the attached of microorganism
Growth；
(2) present invention filler and have this filler BAF run system to SS, COD, NH3-N and P has and preferably goes
Except efficiency, and overall removal of soils effect is preferable, and the improvement of stain disease and the improvement of water environment are had important practical significance；
(3) preparation technology of filler of the present invention is simple, and production cost is less expensive, it is simple to popularization and application；
(4) fill material density size of the present invention is different from the past increases successively with water (flow) direction, but takes anti-material
The filling design of density size, will be placed on the filler that particle diameter is less by the bigger filler of particle diameter, and the haydite two of filter course
Level configuration is distributed the rule being sequentially reduced also in compliance with particle diameter from top to bottom, and this filling arrangement can alleviate filler blockage problem,
Extend the effective time of system stable operation；
(5) alkali of the present invention leaching excess sludge is the inside and outside double layer sandwich PVC of BAF system employing of filler
Material column structure, and tightly wrap up one layer of glass cotton at internal layer cartridge outer surface, operation system can be made relatively low in temperature
Winter still can obtain the removal efficiency of higher ammonia nitrogen and phosphorus；
(6) the raw material alkali leaching excess sludge of preparing of the present invention is trade waste, is that pickling mud is after alkali soaking technology
The industrial residue produced, and discharge capacity is big, it is achieved the resource innoxious use of trade waste, provide newly for the treatment of wastes with processes of wastes against one another
Thinking；
(7) present invention heat-treating methods modification alkali soaks excess sludge, changes the internal structure of mud, reduces it and inhales
Water rate and bulk density, increase its specific surface area so that it is has good carrier performance；Mud after preheating is continued at 500-
1-2h is calcined under the conditions of 600 DEG C；Excess sludge has the skeleton of clay, can form more preferable internal pore structure after calcining,
Mud microstructure can be made to increase, and water absorption rate and bulk density decline, and increase the specific surface area of its loose structure, form more hole
Gap structure, the attachment for microorganism is fixing and perches the spatial environments that growth provides favourable；
(8) present invention carries out pelletize process by press atomization comminutor to mud after calcining, and the mean diameter of filler is
0.074-0.178mm, can properly increase adhesion and the coherency of filler, and then effectively change after being granulated to specify particle size range interior
The mobility of kind filler, meanwhile, the problem that pelletize can prevent the meticulous generation of filler from flying upward and be attached to wall surface；
(9) filler is preheated 20-25min at 250-280 DEG C by the present invention；Alkali leaching excess sludge rough surface is loose many
Hole, also there are the more rich pore structure of ratio, and its light weight in inside, and granule is tiny, possesses the potential quality as water treatment filler, preheating
Process can preferably regulate the carbon content in alkali leaching excess sludge, beneficially more mushy formation in calcination process, enters one
Step increases the specific surface area of filler；
(10) experiment of the present invention shows the Leaching of Heavy Metals value (Pb:0.8 ± 0.1mg/L of this filler；Zn:4.5 ±
0.5mg/L) with organic poison leaching value (not detecting organic poison) far below GB5058.3-2007 " hazardous waste judging standard
One leaching characteristic identification " be given Leaching of Heavy Metals limit value (Pb:5mg/L；Zn:100mg/L) and organic poison leach limit value；
The filler prepared also has preferable absorption property (COD, NH3-N eliminating rate of absorption respectively up to 10%, 12%, phosphorus absorption go
Except rate is up to 50%), improve the water treatmenting performance of filler further.
Accompanying drawing explanation
Fig. 1 is BAF cell body profile.
Label declaration in figure: 1 is water inlet；2 is outlet；3 is ceramic filtration layer；4 is filler；5 fill for micro-pore aeration
Put；6 is back purge system；7 is glass cotton.
Detailed description of the invention
By the following examples to of the present invention a kind of with the alkali leaching excess sludge BAF system as filler
It is described further, but protection scope of the present invention is not limited to embodiment.
In conjunction with Fig. 1, a kind of with the alkali leaching excess sludge BAF system as filler, including water inlet 1 and water outlet
Mouth 2, also includes filter course 3, packing layer 4, microporous aeration device 5 and back purge system 6, and bacteria filter system is the most successively
For filter course 3, microporous aeration device 5 and back purge system 6, between bacteria filter system inner filtration layer 3 and microporous aeration device 5
For packing layer 4, water inlet 1 is positioned at the top of bacteria filter system, and outlet 2 is positioned at the bottom of bacteria filter system.
Bacteria filter system is the column structure of PVC material, and bacteria filter system includes inside and outside two-layer cylinder, biofilter
Being confined to vacuum between the ectonexine cylinder of system, internal layer cartridge outer surface tightly wraps up one layer of heat preservation glass cotton 7；This insulation sets
Put and bacteria filter system can be made in the relatively low removal efficiency still winter with preferable ammonia nitrogen and phosphorus of temperature.
Low temperature is unfavorable for the removal of ammonia nitrogen and phosphorus, especially has considerable influence to dephosphorization, and PVC material heat conductivity is poor, glass
Glass cotton heat preservation and insulation is good, and the column structure design of inside and outside double layer sandwich also can reduce the stream of heat to a certain extent
Lose, therefore use inside and outside double layer sandwich PVC material column structure, and tightly wrap up one layer of glass cotton at internal layer cartridge outer surface, can
Make BAF system in the relatively low removal efficiency that still can obtain higher ammonia nitrogen and phosphorus winter of temperature.Experiment table
Bright, use under the operation system cryogenic conditions in the winter time of this INSULATION DESIGN, can improve compared to the system not using INSULATION DESIGN
Ammonia nitrogen and the removal efficiency of phosphorus, improve percentage ratio and be respectively 9.8% and 22.7%.
Filter course 3 is set to upper and lower two stage arrangement, and the filler in filter course 3 takes the filling of anti-material density size to set
Meter, i.e. particle diameter of filter medium in filter course 3 higher level are more than the particle diameter of filter medium in filter course 3 subordinate.
Filter course about 3 two-stage all fills haydite, and the rule that from top to bottom haydite particle diameter is sequentially reduced is followed in haydite distribution,
The filling design of anti-material density size taked by filler, will be placed on the haydite that particle diameter is less by the bigger haydite of particle diameter.
SS gathering in deposition and filter process is the one of the main reasons of filler blocking, uses this filling layout side
Formula, because upper strata filtrate size is relatively big, therefore can extend the assemble index in SS deposition and filter process, and then alleviate feed blocking
Problem.
Filler is filled in the packing layer 4 between filter course 3 and microporous aeration device 5, and in packing layer 4, the particle diameter of filler is adopted
Negate the filling design of material density size, it then follows the rule that from top to bottom particle diameter is sequentially reduced.
Fill material density size is different from the past to be increased successively with water (flow) direction, but takes anti-material density size
Filling design, will be placed on the filler that particle diameter is less by the bigger filler of particle diameter, and the haydite two-level distribution distribution of filter course 3
The rule being sequentially reduced also in compliance with particle diameter from top to bottom, this filling arrangement can be alleviated filler blockage problem, extend system steady
The fixed effective time run.
SS gathering in deposition and filter process and rapid microbial growth cause the increase of Biomass, wherein SS
Deposition gathering has more adverse influence than increasing of Biomass.Therefore, this filler is loaded into the ceramic filtration that particle diameter is bigger
The lower section of layer 3, the arrangement forming the material density trend gradually reduced with water (flow) direction adds effectively admittedly depositing of filtrate
Capacity, makes filtrate play one's part to the full.Meanwhile, larger particles is placed in upper strata can increase supernatant liquid convection current and air diffusion effect
Rate, further speeds up biodegradation and the mineralising of deposition SS and removes course, therefore can alleviate filler to a certain extent and easily block and ask
Topic, extends the duration of system stable operation.Experiment shows, the duration of congestion of traditional arrangement mode is about 28-35 days, this layout side
Duration of congestion can be extended to 35-40 days by formula.
A kind of with the preparation method of filler in the alkali leaching excess sludge BAF system as filler, the steps include:
Step one, alkali is soaked excess sludge it is washed to neutrality；Alkali leaching excess sludge rough surface is loose porous, and inside also has
The more rich pore structure of ratio, and its light weight, granule is tiny, possesses the potential quality as water treatment filler；Alkali leaching excess sludge in
Alkalescence, is unfavorable for the apposition growth of microorganism, therefore need to be washed to neutrality, and the packing layer 4 of preparation is conducive to the attached of microorganism
Growth；
Step 2, alkali leaching excess sludge grinds after drying and sieves；Reduce mud particle diameter, make pretreatment for calcining heat treatment,
To obtaining more preferable carrier performance；
Step 3, grinding is sieved after alkali leaching excess sludge at 250-280 DEG C, preheat 20-25min；Warm can
Preferably to regulate the carbon content in alkali leaching excess sludge, beneficially more mushy formation in calcination process；
Step 4, will preheating after alkali leaching excess sludge continue under the conditions of 500-600 DEG C calcine 1-2h；Excess sludge has
There is the skeleton of clay, more preferable internal pore structure can be formed after calcining, mud microstructure can be made to increase, water absorption rate and heap
Density declines, and increases the specific surface area of its loose structure, forms more pore structure, and the attachment for microorganism is fixed and perches
Growth provides favourable spatial environments；
Step 5, by press atomization comminutor, alkali leaching excess sludge after calcining is carried out pelletize process, filler average
Particle diameter is 0.172mm, preserves under hermetically drying environment；Because this filler water absorption is preferable, the filler prepared is the most sealed
Preservation will affect follow-up filling work, the convenient filling with filtrate of dry filler.
Adhesion and the coherency of filler can be properly increased after being granulated to specify particle size range interior, and then be effectively improved filler
Mobility, meanwhile, the problem that pelletize can prevent the meticulous generation of filler from flying upward and be attached to wall surface.
Preparing raw material alkali leaching excess sludge is trade waste, is the Industry Waste that produces after alkali soaking technology of pickling mud
Slag, and discharge capacity is big, it is achieved the resource innoxious use of trade waste, provide new approaches for the treatment of wastes with processes of wastes against one another.
Alkali leaching excess sludge rough surface is loose porous, and also there are the more rich pore structure of ratio, and its light weight, granule in inside
Tiny, possess the potential quality as water treatment filler, warm can the preferably carbon content in conditioning of mud, be conducive to calcining
During more hole formed.Suitably calcination condition (550 DEG C, 1.7h) can make mud microstructure increase, water absorption rate and
Bulk density declines, and increases the specific surface area of its loose structure, and the attachment for microorganism is fixed and perched growth provides favorable environment.
Meanwhile, experiment shows the Leaching of Heavy Metals value (Pb:0.8 ± 0.1mg/L of this filler；Zn:4.5 ± 0.5mg/L) and organic poison
Leaching value (not detecting organic poison) is given far below GB5058.3-2007 " hazardous waste judging standard one leaching characteristic identification "
Leaching of Heavy Metals limit value (Pb:5mg/L；Zn:100mg/L) and organic poison leach limit value.The filler prepared also has relatively
Good absorption property (COD, NH3-N eliminating rate of absorption respectively up to 10%, 12%, phosphorus eliminating rate of absorption is up to 50%), enter one
Step improves the water treatmenting performance of filler.
A kind of operation method soaking the excess sludge BAF system as filler with alkali, the steps include:
One, biofilm
Step one, first mud and secondary sedimentation tank water outlet are added in bacteria filter system simultaneously, intermittent aerating；Intermittently
Aeration makes aeration more uniform, prevents the problems such as the too high suppression nitrification brought of dissolved oxygen and sludge aging.
Discharge supernatant after step 2, standing, add sewage and mud, intermittent aerating；Intermittent aerating makes aeration more
Add uniformly, prevent the problems such as the too high suppression nitrification brought of dissolved oxygen and sludge aging.
Step 3, also aeration of intaking from water inlet 1, set the hydraulic detention time of BAF system；
Seed sludge uses secondary sedimentation tank of sewage treatment work returned sludge, first 3L mud and appropriate secondary clarifier effluent is thrown simultaneously
Being added in filter tank, intermittent aerating 4 days (aeration 10h, rest 2h), aeration control discharges supernatant after 11L/h, standing, then
Adding sewage and 2L mud intermittent aerating 2 days, the 7th day starts continuum micromeehanics and aeration, when setting the hydraulic retention of operation system
Between be 7h.
Two, backwash
After closing water inlet 1 and outlet 2, open aerator and carry out 4min gas flushing, restart backwash pump, carry out
Air water combines flushing 4min, after closing aerator and backwash pump, opens water inlet 1 and outlet 2.
The float that backwash can remove aging biomembrane and release is dammed, and then improve the decontamination effect of operation system
Rate, its frequency was close with prior art, for 5-7 days.
Extending the duration of system stable operation, experiment shows, the duration of congestion of traditional arrangement mode is about 28-35 days, should
Duration of congestion can be extended to 35-40 days by arrangement.
Embodiment 1
Soaking the excess sludge BAF system as filler as it is shown in figure 1, a kind of with alkali, the internal diameter of double-deck cylinder is
24cm, external diameter is 30cm, internal layer post height 100cm, outer layer post height 95cm, and dischargeable capacity is about 36L, packing layer 4 effective depth
50cm, the high 20cm of ceramic filtration layer 3, filter course 3 is set to the distribution of upper and lower two-level distribution, and levels average particle size range is respectively
10-12mm and 4-6mm, water distribution height 10cm.
As long as with choosing of bottom inner diameter ratio, filter tank height may insure that run duration flow velocity is suitable with dissolved oxygen in system
, this special value meets requirement through test discovery.Bed stuffing height and ceramic filtration Ceng Deng filtrate district height are according to organic
The combined factors such as pollutional load and filter material layer resistance consider to determine；Water distribution height is mainly in view of carrier performance and filter during backwash
Material expansion rate, to guarantee not have overflow phenomena.
Embodiment 2
Seeing Fig. 1, a kind of BAF with alkali leaching excess sludge as filler runs system, and this BAF cell body includes
Water inlet 1, filter course 3, packing layer 4, microporous aeration device 5 and back purge system 6, the heat insulation glass that from top to bottom order is arranged
Cotton 7, outlet 2.The internal diameter of double-deck cylinder is 24cm, and external diameter is 30cm, internal layer post height 100cm, and outer layer post height 95cm effectively holds
The long-pending 36L that is about, packing layer 4 effective depth 50cm, the high 20cm of ceramic filtration layer 3, the filling rate of filler and haydite all 90% with
On, ceramic filtration layer 3 is set to the distribution of upper and lower two-level distribution, and levels average particle size range is respectively 10-12mm and 4-6mm,
Floor height is each about 10cm, water distribution height 10cm up and down.
It is as follows that this BAF system biofilm implements step: seed sludge uses sewage treatment plant's secondary sedimentation tank to return
Stream mud, is first added to 3L mud and appropriate secondary clarifier effluent in filter tank simultaneously, intermittent aerating 4d (aeration 10h, rest 2h),
Aeration control discharges supernatant after 10-12L/h, standing, adds sewage and 2L mud intermittent aerating 2 days.7th day starts
Continuum micromeehanics and aeration, set the hydraulic detention time of operation system as 6h.
Aeration rate between this BAF system continuous operating period is set to 10-12L/h, and in the present embodiment, aeration rate can
Equivalent to be set to 10L/h, 11L/h, 12L/h, the most both can meet dissolved oxygen concentration requirement, it is also possible to reduce filter material surface
Wash away, do not affect attachment and the growth of microorganism.The hydraulic load value of run duration takes 0.06-0.08m3/(m2H), this enforcement
Hydraulic load value in example takes 0.06m3/(m2·h)、0.07m3/(m2·h)、0.08m3/(m2H), under which loading, aeration
Biofilter reactor can ensure higher Organic substance, ammonia nitrogen and tp removal rate level.
Sewage used by the biofilm stage and process sewage are with certain community daily life sewage for processing object, main water of intaking
Matter index is: COD be 350-400mg/L, SS be 200-240mg/L, NH3-N be 30-35mg/L, TP be 6-8mg/L, pH be 7-
8。
Embodiment 3
In conjunction with Fig. 1, a kind of with the alkali leaching excess sludge BAF system as filler, including water inlet 1 and water outlet
Mouth 2, it is characterised in that also include filter course 3, packing layer 4, microporous aeration device 5 and back purge system 6, bacteria filter system
It is followed successively by filter course 3, microporous aeration device 5 and back purge system 6, bacteria filter system inner filtration layer 3 and micropore from top to bottom
Being packing layer 4 between aerator 5, water inlet 1 is positioned at the top of bacteria filter system, and outlet 2 is positioned at bacteria filter system
Bottom.
Bacteria filter system is the cylinder of PVC material, and bacteria filter system includes ectonexine two-layer cylinder, and biofilter is
Being confined to vacuum between the ectonexine cylinder of system, internal layer cartridge outer surface tightly wraps up one layer of heat preservation glass cotton 7；This insulation is arranged
Bacteria filter system can be made in the relatively low removal efficiency still winter with preferable ammonia nitrogen and phosphorus of temperature.
Filter course 3 is set to upper and lower two stage arrangement, and the filler in filter course 3 takes the filling of anti-material density size to set
Meter, i.e. particle diameter of filter medium in filter course 3 higher level are more than the particle diameter of filter medium in filter course 3 subordinate；Filter course about 3 two-stage is all filled
Haydite, haydite is distributed follows the rule that from top to bottom haydite particle diameter is sequentially reduced, and the filling of anti-material density size taked by filler
Design, will be placed on the haydite that particle diameter is less by the bigger haydite of particle diameter.
SS gathering in deposition and filter process is the one of the main reasons of filler blocking, uses this filling layout side
Formula, because upper strata filtrate size is relatively big, therefore can extend the assemble index in SS deposition and filter process, and then alleviate feed blocking
Problem.
Filler is filled between filter course 3 and microporous aeration device 5, and the particle diameter of filler is less than filling out in filter course 3 subordinate
Material particle diameter, takes the filling design of anti-material density size, it then follows the rule that from top to bottom particle diameter is sequentially reduced.Filler average
Particle size range is 0.074-0.178mm；In this particle size range, obtained filler has preferable mobility, and can prevent from filling out
Material flies upward on the wall being attached to bacteria filter system, can improve the utilization ratio of oxygen simultaneously；Less than this mean diameter model
The filler adhesion enclosed is too big, and easily flies upward and be attached on wall；Higher than the filler of this average particle size range, its adhesion
Reducing with coherency, mobility is deteriorated.In the present embodiment the selectable mean diameter of filler be respectively 0.074mm,
0.171mm、0.178mm。
Fill material density size is different from the past to be increased successively with water (flow) direction, but takes anti-material density size
Filling design, will be placed on the filler that particle diameter is less by the bigger haydite of particle diameter, and filter course haydite two-level distribution is distributed also
Following the rule that particle diameter from top to bottom is sequentially reduced, this filling arrangement can alleviate filler blockage problem, extends system stability
The effective time run.
Embodiment 4
A kind of with the preparation method of filler in the alkali leaching excess sludge BAF system as filler, the steps include:
Step one, alkali is soaked excess sludge it is washed to neutrality；Alkali leaching excess sludge rough surface is loose porous, and inside also has
The more rich pore structure of ratio, and its light weight, granule is tiny, possesses the potential quality as water treatment filler；Alkali leaching excess sludge in
Alkalescence, is unfavorable for the apposition growth of microorganism, therefore need to be washed to neutrality, and the packing layer 4 of preparation is conducive to the attached of microorganism
Growth；
Step 2, alkali leaching excess sludge grinds after drying and sieves；Reduce mud particle diameter, make pretreatment for calcining heat treatment,
To obtaining more preferable carrier performance；
Step 3, grinding is sieved after alkali leaching excess sludge at 250-280 DEG C, preheat 20-25min；Warm can
Preferably to regulate the carbon content in alkali leaching excess sludge, the beneficially formation of calcination process mesopore；In the present embodiment optional
Select 250 DEG C, 275 DEG C, preheat the durations such as 20min, 22min, 25min under 280 DEG C of isothermal angle value；
Step 4, will preheating after alkali leaching excess sludge continue under the conditions of 500-600 DEG C calcine 1-2h；Excess sludge has
There is the skeleton of clay, more preferable internal pore structure can be formed after calcining, mud microstructure can be made to increase, water absorption rate and heap
Density declines, and increases the specific surface area of its loose structure, forms more pore structure, and the attachment for microorganism is fixed and perches
Growth provides favourable spatial environments；The present embodiment may select 500 DEG C, 560 DEG C, calcine under the conditions of 600 DEG C of isothermal angle value
The durations such as 1h, 2h, 1.6h；
Step 5, by press atomization comminutor to calcining after mud carry out pelletize process, the mean diameter of filler is
0.074-0.178mm, preserves under hermetically drying environment；Because this filler water absorption is preferable, the filler prepared is the most sealed
Preservation will affect follow-up filling work, the convenient filling with filtrate of dry filler；Preparing raw material alkali leaching excess sludge is work
Industry garbage, is the industrial residue that produces after alkali soaking technology of pickling mud, and discharge capacity is big, it is achieved the money of trade waste
Source innoxious use, provides new approaches for the treatment of wastes with processes of wastes against one another；In the present embodiment, the selectable mean diameter of filler is respectively
0.074mm、0.079mm、0.093mm、0.158mm、0.169mm、0.178mm。
In this particle size range, obtained filler has a preferable mobility, and can prevent from filler from flying upward being attached to biology
On the wall of filter tank system, the utilization ratio of oxygen can be improved simultaneously；Less than this average particle size range filler adhesion too
Greatly, and easily fly upward and be attached on wall；Higher than the filler of this average particle size range, its adhesion reduces with coherency, stream
Dynamic property is deteriorated.
Embodiment 5
A kind of operation method soaking the excess sludge BAF system as filler with alkali, the steps include:
One, biofilm
Step one, first mud and secondary sedimentation tank water outlet are added in filter tank simultaneously, intermittent aerating；Intermittent aerating makes
Aeration is more uniform, prevents the problems such as the too high suppression nitrification brought of dissolved oxygen and sludge aging；The aeration rate control of intermittent aerating
System is at 10-12L/h.Aeration rate in this range, both can ensure higher dissolved oxygen concentration, can reduce again aeration to filter material surface
Wash away and affect attachment and the growth of microorganism；
Discharge supernatant after step 2, standing, add sewage and mud, intermittent aerating；Intermittent aerating makes aeration more
Add uniformly, prevent the problems such as the too high suppression nitrification brought of dissolved oxygen and sludge aging.
Step 3, also aeration of intaking from water inlet 1, set the hydraulic detention time of BAF system；Aeration is raw
The hydraulic detention time of thing filter tank system is set as 5-7h.
Seed sludge uses sewage treatment plant's secondary sedimentation tank returned sludge, first by same to 3L mud and appropriate secondary clarifier effluent
Time be added in filter tank, intermittent aerating 4 days (aeration 10h, rest 2h), aeration control can in 10-12L/h, the present embodiment
Selecting aeration rate is that 10L/h, 11L/h, 12L/h are equivalent, discharges supernatant, add sewage and 2L mud intermittent aerating after standing
2 days.7th day starts continuum micromeehanics and aeration, sets the hydraulic detention time of operation system as 5-7h, may select in the present embodiment
Hydraulic detention time is that 5h, 6h, 7h are equivalent.
Two, backwash
After closing water inlet 1 and outlet 2, open aerator and carry out 4-6min gas flushing, optional gas in the present embodiment
Washing time is that 4min, 4.5min, 6min are equivalent, restarts backwash pump, carries out air water and combines flushing 4-6min, this enforcement
In example, to combine flushing equivalent for 4min, 4.5min, 6min for optional air water, after closing aerator and backwash pump, open into
The mouth of a river 1 and outlet 2.
The float that backwash can remove aging biomembrane and release is dammed, and then improve the decontamination effect of operation system
Rate, its frequency was close with prior art, for 5-7 days.
The duration experiment extending system stable operation shows, the duration of congestion of traditional arrangement mode is about 28-35 days, this cloth
Duration of congestion can be extended to 35-40 days by the mode of putting.
As long as with choosing of bottom inner diameter ratio, filter tank height may insure that run duration flow velocity is suitable with dissolved oxygen in system
, this special value meets requirement through test discovery.Bed stuffing height and ceramic filtration Ceng Deng filtrate district height are according to organic
The combined factors such as pollutional load and filter material layer resistance consider to determine；Water distribution height is mainly in view of carrier performance and filter during backwash
Material expansion rate, to guarantee not have overflow phenomena.
Embodiment 6
A kind of with the preparation method of filler in the alkali leaching excess sludge BAF system as filler, the present embodiment is same
Embodiment 4, difference is, in step 3, it preheats at 280 DEG C 25min；Step 4, will preheating after mud continue
Continue calcining 1h under the conditions of 600 DEG C；Step 5, by press atomization comminutor to calcining after mud carry out pelletize process, filler
Mean diameter be 0.074mm, under hermetically drying environment preserve.
It is filled into on-demand for the filler made in BAF reactor, intakes after system biofilm completes properly functioning, continuously
The aeration rate of run duration is set to 10L/h, and the hydraulic load value of run duration takes 0.06m3/(m2H), sample detecting goes out on time
Water water quality index, wherein COD clearance is 78%, and SS clearance is 90%, NH3-N clearance is 74%, and TP clearance is
62%.
Embodiment 7
A kind of with the preparation method of filler in the alkali leaching excess sludge BAF system as filler, the present embodiment is same
Embodiment 4, difference is, in step 3, it preheats at 250 DEG C 20min；Step 4, will preheating after mud continue
Continue calcining 2h under the conditions of 500 DEG C；Step 5, by press atomization comminutor to calcining after mud carry out pelletize process, filler
Mean diameter be 0.178mm, under hermetically drying environment preserve.
It is filled into on-demand for the filler prepared under preparation condition same as in Example 1 in BAF reactor, treats that system is hung
Film is intake properly functioning after completing, the aeration rate between continuous operating period is set to 12L/h, and the hydraulic load value of run duration takes
0.08m3/(m2H), sample detecting effluent quality index on time, wherein COD clearance is 82%, and SS clearance is 91%,
NH3-N clearance is 78%, and TP clearance is 65%.
Embodiment 8
A kind of with the preparation method of filler in the alkali leaching excess sludge BAF system as filler, the present embodiment is same
Embodiment 4, difference is, in step 3, it preheats at 270 DEG C 24min；Step 4, will preheating after mud continue
Continue calcining 1-2h under the conditions of 560 DEG C；Step 5, by press atomization comminutor to calcining after mud carry out pelletize process, fill out
The mean diameter of material is 0.156mm, preserves under hermetically drying environment.
It is filled into on-demand for the filler prepared under preparation condition same as in Example 1 in BAF reactor, treats that system is hung
Film is intake properly functioning after completing, the aeration rate between continuous operating period is set to 11L/h, and the hydraulic load value of run duration takes
0.07m3/(m2H), sample detecting effluent quality index on time, wherein COD clearance is 86%, and SS clearance is 92%,
NH3-N clearance is 76%, and TP clearance is 68%.
Embodiment 9
A kind of with the preparation method of filler in the alkali leaching excess sludge BAF system as filler, the present embodiment is same
Embodiment 4, difference is, in step 3, it preheats at 250 DEG C 23min；Step 4, will preheating after mud continue
Continue calcining 1.5h under the conditions of 550 DEG C；Step 5, by press atomization comminutor to calcining after mud carry out pelletize process, fill out
The mean diameter of material is 0.148mm, preserves under hermetically drying environment.
It is filled into on-demand for the filler prepared under preparation condition same as in Example 1 in BAF reactor, treats that system is hung
Film is intake properly functioning after completing, the aeration rate between continuous operating period is set to 12L/h, and the hydraulic load value of run duration takes
0.06m3/(m2H), sample detecting effluent quality index on time, wherein COD clearance is 83%, and SS clearance is 91%,
NH3-N clearance is 71%, and TP clearance is 60%.
Embodiment 10
A kind of operation method soaking the excess sludge BAF system as filler with alkali, with above example class
Seemingly, wherein during backwash, after closing water inlet 1 and outlet 2, open aerator and carry out 4min gas flushing, restart backwash
Water pump, carries out air water and combines flushing 6min, after cutting out aerator and backwash pump, open water inlet 1 and outlet 2.
The float that backwash can remove aging biomembrane and release is dammed, and then improve the decontamination effect of operation system
Rate, its frequency is close with prior art, is 5 days.
Extending the duration of system stable operation, experiment shows, the duration of congestion of traditional arrangement mode is about 28-35 days, should
Duration of congestion can be extended to 35 days by arrangement.
Embodiment 11
A kind of operation method soaking the excess sludge BAF system as filler with alkali, with above example class
Seemingly, wherein during backwash, after closing water inlet 1 and outlet 2, open aerator and carry out 6min gas flushing, restart backwash
Water pump, carries out air water and combines flushing 4min, after cutting out aerator and backwash pump, open water inlet 1 and outlet 2.
The float that backwash can remove aging biomembrane and release is dammed, and then improve the decontamination effect of operation system
Rate, its frequency is close with prior art, is 7 days.
Extending the duration of system stable operation, experiment shows, the duration of congestion of traditional arrangement mode is about 28-35 days, should
Duration of congestion can be extended to 40 days by arrangement.
Embodiment 12
A kind of operation method soaking the excess sludge BAF system as filler with alkali, with above example class
Seemingly, wherein during backwash, after closing water inlet 1 and outlet 2, open aerator and carry out 5min gas flushing, restart backwash
Water pump, carries out air water and combines flushing 5min, after cutting out aerator and backwash pump, open water inlet 1 and outlet 2.
The float that backwash can remove aging biomembrane and release is dammed, and then improve the decontamination effect of operation system
Rate, its frequency is close with prior art, is 6 days.
Extending the duration of system stable operation, experiment shows, the duration of congestion of traditional arrangement mode is about 28-35 days, should
Duration of congestion can be extended to 38 days by arrangement.
Schematically being described the present invention and embodiment thereof above, this description does not has restricted, so, if
Those of ordinary skill in the art is enlightened by it, in the case of without departing from the invention objective, without creative design
Go out the preparation method similar to this technical scheme and embodiment, protection scope of the present invention all should be belonged to.
Claims (10)
1. soak an excess sludge BAF system as filler with alkali, including water inlet (1) and outlet (2), its
Being characterised by, also include filter course (3), packing layer (4), microporous aeration device (5) and back purge system (6), biofilter is
System is followed successively by filter course (3), microporous aeration device (5) and back purge system (6), bacteria filter system inner filtration layer from top to bottom
(3) and be packing layer (4) between microporous aeration device (5), water inlet (1) is positioned at the top of bacteria filter system, outlet (2)
It is positioned at the bottom of bacteria filter system.
The most according to claim 1 a kind of with the alkali leaching excess sludge BAF system as filler, its feature exists
In, bacteria filter system is PVC material column structure, and bacteria filter system includes inside and outside two-layer cylinder.
The most according to claim 1 and 2 a kind of with the alkali leaching excess sludge BAF system as filler, its feature
Being, being confined to vacuum between the ectonexine cylinder of bacteria filter system, internal layer cartridge outer surface tightly wraps up one layer of heat preservation glass
Glass is cotton (7).
The most according to claim 3 a kind of with the alkali leaching excess sludge BAF system as filler, its feature exists
In, filter course (3) two-stage up and down all fills haydite, and the rule that from top to bottom haydite particle diameter is sequentially reduced is followed in haydite distribution.
The most according to claim 1 and 2 a kind of with the alkali leaching excess sludge BAF system as filler, its feature
Being, filler is filled in the packing layer (4) between filter course (3) and microporous aeration device (5) Nei, packing layer (4) interior filler
Particle diameter takes the filling design of anti-material density size, it then follows the rule that from top to bottom particle diameter is sequentially reduced.
The most according to claim 1 a kind of with the system of filler in the alkali leaching excess sludge BAF system as filler
Preparation Method, it is characterised in that:
Step one, alkali is soaked excess sludge it is washed to neutrality；
Step 2, alkali leaching excess sludge grinds after drying and sieves；
Step 3, grinding is sieved after alkali leaching excess sludge at 250-280 DEG C, preheat 20-25min；
Step 4, will preheating after alkali leaching excess sludge continue under the conditions of 500-600 DEG C calcine 1-2h；
Step 5, by press atomization comminutor to calcining after alkali leaching excess sludge carry out pelletize process, in hermetically drying environment
Lower preservation.
The most according to claim 6 a kind of with the system of filler in the alkali leaching excess sludge BAF system as filler
Preparation Method, it is characterised in that the mean diameter of filler is 0.074-0.178mm.
8. the operation method soaking the excess sludge BAF system as filler with alkali, it is characterised in that:
One, biofilm
Step one, first mud and secondary sedimentation tank water outlet are added in bacteria filter system simultaneously, intermittent aerating；
Discharge supernatant after step 2, standing, add sewage and mud, intermittent aerating；
Step 3, also aeration of intaking from water inlet (1), set the hydraulic detention time of BAF system；
Two, backwash
After closing water inlet (1) and outlet (2), open aerator and carry out 4-6min gas flushing, restart backwash pump, enter
Circulation of qi promoting water combines flushing 4-6min, after closing aerator and backwash pump, opens water inlet (1) and outlet (2).
A kind of operation side soaking the excess sludge BAF system as filler with alkali the most according to claim 6
Method, it is characterised in that the aeration control of the intermittent aerating of step one is at 10-12L/h.
A kind of operation side soaking the excess sludge BAF system as filler with alkali the most according to claim 6
Method, it is characterised in that the hydraulic detention time of the BAF system of step 3 is set as 5-7h.
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| CN106622105A (en) * | 2016-11-22 | 2017-05-10 | 环境保护部南京环境科学研究所 | Method for preparing phosphorus and heavy metal adsorbent from alkaline leaching excess sludge and application method of phosphorus and heavy metal adsorbent |
| CN110092483A (en) * | 2019-04-12 | 2019-08-06 | 徐州工程学院 | A kind of high cadmium waste water processing method based on Wei Si Salmonella |
| CN112340836A (en) * | 2020-11-06 | 2021-02-09 | 江西挺进环保科技有限公司 | A2O + MBBR processing system based on low-cost suspended packing |
| CN113461259A (en) * | 2021-07-01 | 2021-10-01 | 珠江水利委员会珠江水利科学研究院 | Treatment system for rural decentralized domestic garbage and sewage |
| CN114570194A (en) * | 2021-12-29 | 2022-06-03 | 朗昆（北京）新环保科技有限公司 | Growth-promoting flora for treating waste gas generated in viscose fiber production, filter bed, device and method |
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