CN101327987B - Use of sludge porcelain granule in sewage disposal - Google Patents
Use of sludge porcelain granule in sewage disposal Download PDFInfo
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- CN101327987B CN101327987B CN2008101383138A CN200810138313A CN101327987B CN 101327987 B CN101327987 B CN 101327987B CN 2008101383138 A CN2008101383138 A CN 2008101383138A CN 200810138313 A CN200810138313 A CN 200810138313A CN 101327987 B CN101327987 B CN 101327987B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention relates to a sludge ceramisite in the sewage treatment belonging to the sewage treatment technology field. The application of the sludge ceramisite in the sewage treatment is characterized in that the sludge ceramisite is used in a biologic filter or a fluidized bed bioreactor as sewage treatment fillings. The sludge ceramisite used in the sewage treatment widens the sludge resourceful technology field, has a wide popularization using value and the environmental effect of ''treatment of a waste with another waste'', thereby the method of the invention achieves double efficiency of economic benefit and environmental benefit.
Description
(1) technical field
The present invention relates to a kind of sludge ceramsite in Application of Sewage, belong to technical field of sewage.
(2) background technology
Sludge of sewage treatment plant is the by product of sewage disposal, its water content height, complicated component, not only contain nutritive elements such as great number of organic matters, N, P, K, also contain a large amount of pathogenic micro-organisms, and, influenced by trade effluent with stench, often also have more poisonous, objectionable impuritiess such as heavy metal, deal with improperly and very easily cause serious secondary pollution.The dewatered sludge of the annual discharging in China municipal sewage plant at present amount is about 1,300,000 t, but also with the speed increment in every year about 10%.How reasonably disposing sludge of sewage treatment plant, the outlet that solves a large amount of mud has become a major issue of the human ecological environment security of relation.Organic resource technology is the integral part of research sludge treatment disposal technology in the mud, promptly utilize means such as physics, chemistry, biochemistry, organic resource utilization in the mud is used, and the while finally reaches and makes sludge stabilizing, minimizing and innoxious purpose.Resource technology had both met the STRATEGIES OF SUSTAINABLE DEVELOPMENT policy, also helped setting up circular form economy, therefore was subjected to more and more widely concern and attention.
At present, the resource technology of mud can be divided into following several big class: the fertilizer efficiency utilization of (), mud organic matter comprises the soil utilization of sludge composting and mud etc.; (2), the sludge heat energy utilization, comprise sludge incineration generating, heat supply and dry back preparation solid fuel etc.; (3), the trans-utilization of carbon in the mud, comprise anaerobic digestion producing methane, producing oil from sludge technology and derived from sludge preparing active carbon technology etc.; (4), the utilization of biomass in the mud, comprise and make bio-degradable plastics, produce biochemical fiberboard, make animal-feed, papermaking, produce sorbent material and fire-fighting medium etc.; (5) mud is made building materials, comprises system light ceramic, system melting material and fusion devitrified glass and brickmaking and cement etc.; As publication number is the Chinese patent of CN101148346, and disclosing with dewatered sludge of urban sewage plant, flyash, clay is raw material, is mixed in proportion, and the sintering that progressively heats up promptly makes haydite.This haydite is the globular solids of yellow or brown, and loose volume weight is 650-750kg/m
3, particle unit weight is 1050-1150kg/m
3, water-intake rate is 5.80-10.8%, specific surface area is 2.29-5.56m
2/ g.(6), the environmental protection utilization, comprise lixiviate and reclaim sludge heavy-metal etc.The work of preparation light weight sludge haydite enters middle trial production by laboratory stage, and because of material follows general commodity haydite similar, so sludge ceramsite has wide application prospect aspect building materials.At present, sludge ceramsite is applied to wastewater treatment, as BAF (biological aerated filter, the rarely seen report of the research of filler BAF), so under the big atmosphere of environmental protection field " treatment of wastes with processes of wastes against one another ", study the significant of its feasibility that is used for sewage disposal and effect.
(3) summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of sludge ceramsite in Application of Sewage.
A kind of sludge ceramsite is characterized in that being used for biological filter or fluidized bed bio reactor as the sewage disposal filler in Application of Sewage.
Described sludge ceramsite can be by prior art, and the present invention is not particularly limited.On the other hand, each constituent mass of the preferred sludge ceramsite of the present invention is than being mud: flyash: clay=1～3: 1～2: 0.5～1.
Preferably, described sludge ceramsite density rating is in 600～900 the biological filter that is applied to.
Wherein, described biological filter can be the complete aerobic conventional BAF that is used for organic matter removal, ammonia nitrogen and SS, also can be the anoxic that has de-carbon, denitrogenation and the SS concurrently/aerobic integrated formula biological filter of transforming through combination.
Preferably, described sludge ceramsite density rating 200～500 be applied to the fluidized bed bio reactor.
Preferably, run parameter was as follows when described sludge ceramsite was applied to the biological filter: hydraulic detention time 0.5-3h, gas-water ratio 5-25, reflux ratio 100%-300%, packed height 25-110cm.
Sludge ceramsite is used for the feasibility of sewage disposal
Only meeting relevant technological standard could promote in water treatment field.Test is a mud with sludge ceramsite: flyash: clay=1: 1: 1 (mass ratio) batching is fired and is formed, and each raw-material one-tenth is grouped into as shown in table 1.The Poromaster60 void distribution determinator (mercury injection apparatus) that adopts U.S. Quantachrome company to produce is as shown in table 2 to the analytical results of sludge ceramsite and the main proterties of commodity haydite.
Table 1 composition of raw material is formed (%)
The proterties of table 2 sludge ceramsite and commodity haydite
By table 2 as seen, sludge ceramsite is compared with the general goods haydite has higher overall porosity and total surface area, and tap density and apparent density the former all be lower than the latter, lighter weight.And these advantages be as the BAF filler the key property that should possess.In addition, the sludge ceramsite heavy metal leaching experiment of table 3 shows: the concentration of main heavy metal all is lower than the leach liquor maximum permissible concentration of regulation among the GB GB 5085.3-2007 (" Hazardous wastes judging standard-leaching toxicity is differentiated ").This explanation sludge ceramsite is used for the sewage water treatment and has broad application prospects, and is safe and feasible.
Table 3 sludge ceramsite leach liquor heavy metal content
Bigger specific surface area, higher porosity and lighter tap density and apparent density density make sludge ceramsite have in water treatment than the more excellent characteristic of commodity haydite.The heavy metal leaching test has proved that then it is safe that sludge ceramsite is applied to water treatment.Sludge ceramsite is applied in two kinds of different biological filtering tank process, and it has good removal effect to organism, ammonia nitrogen, total nitrogen etc. in the sewage, compares with the commodity haydite not to be in an inferior position.Sludge ceramsite is applied to sewage disposal and has widened the recycling sludge technical field, has the environmental effect of wide application value and " treatment of wastes with processes of wastes against one another ", and therefore this use emerging technology has realized the double effects of economic benefit and environmental benefit.
(4) description of drawings
Fig. 1 BAF Experimental equipment; Wherein, 1, air compressor machine, 2, gas meter, 3, water outlet, 4, the filter post, 5, the water intaking flexible pipe, 6, filtrate, 7, supporting layer, 8, aeration sand head, 9, peristaltic pump, 10, fresh water pump, 27, liquid meter.
The variation of Inlet and outlet water pH value in Fig. 2 wastewater treatment;
The clearance of CODcr when Fig. 3 (a) HRT is 3.0h; NH when Fig. 3 (b) HRT is 3.0h
3The clearance of-N;
The clearance of CODcr when Fig. 3 (c) HRT is 1.5h; NH when Fig. 3 (d) HRT is 1.5h
3The clearance of-N;
The clearance of CODcr when Fig. 3 (e) HRT is 0.75h; NH when Fig. 3 (f) HRT is 0.75h
3The clearance of-N;
The clearance of the different heights CODcr of place when Fig. 4 (a) HRT is 3.0h; The different heights NH of place when Fig. 4 (b) HRT is 3.0h
3The clearance of-N; The clearance of the different heights CODcr of place when Fig. 4 (c) HRT is 1.5h; The different heights NH of place when Fig. 4 (d) HRT is 1.5h
3The clearance of-N; The clearance of the different heights CODcr of place when Fig. 4 (e) HRT is 0.75h; The different heights NH of place when Fig. 4 (f) HRT is 0.75h
3The clearance of-N;
The clearance of CODcr under Fig. 5 (a) higher concentration; NH under Fig. 5 (b) higher concentration
3The clearance of-N;
The disposition of CODcr in Fig. 6 (a) actual waste water; NH in Fig. 6 (b) actual waste water
3The disposition of-N;
The turbidity removal situation of Fig. 7 actual waste water;
Fig. 8 anaerobic-aerobic integral type aeration biological filter device system diagram (mark unit: cm); Wherein: 11, pressure lock, 12, air flowmeter, 13, air compressor machine, 14, water outlet, 15, buffer layer, 16, thief hole, 17, aerobic zone, 18, aeration head, 19, the oxygen-starved area, 20, supporting layer, 21, the backflow water butt, 22, reflux pump, 23, water inlet bucket, 24, water inlet, 25, backwashing water, 26, backwashing pump;
Fig. 9 (a) packed height and gas-water ratio are to the influence of CODcr; Fig. 9 (b) packed height and gas-water ratio are to NH
3The influence of-N; Fig. 9 (c) packed height and gas-water ratio are to the influence of TN; Fig. 9 (d) packed height and gas-water ratio are to NO
3 -The influence of-N;
Figure 10 (a) reflux ratio is to the influence of CODcr; Figure 10 (b) reflux ratio is to NH
3The influence of-N; Figure 10 (c) reflux ratio is to the influence of TN; Figure 10 (d) reflux ratio is to NO
3 -The influence of-N.
(5) embodiment
Embodiment 1: sludge ceramsite and commodity haydite are used for the comparison example of sanitary sewage disposal filler
Experimental installation
Testing apparatus is filtered post 4 and is adopted the synthetic glass posts as shown in Figure 1, and diameter is 0.10m, and filter post 4 highly is 1.6m, and the packing height of filtrate 6 is 1.1m.10cm place, post 4 bottom is provided with supporting plate apart from filter, and the goose soft rock of supporting plate upper berth 10cm is filtrate 6 as supporting layer 7 above the supporting layer 7.From supporting layer 7 bottoms, establish a thief hole every 20cm outside the filter post 4.Filter post 4 bottoms are provided with sewage water inlet pipe and back flushing water inlet pipe, the sewage intake pump is two peristaltic pumps 9, and the back flushing intake pump is a fresh water pump 10, and sewage divides two-way to tap into respectively in two filter posts 4, before water-in, respectively add a liquid meter 27, to regulate, to control flooding velocity.Required tolerance is supplied with by a typhoon machine is unified in the device, and air divides two-way to be blasted by bottom of device through gas meter 2, and the device top is provided with and overflows water pipe.
Result and discussion
The variation of pH value in the operational process
In the treating processes to synthetic wastewater, the pH of Inlet and outlet water changes as shown in Figure 2, water inlet pH=6.52～7.71, and commodity haydite post water outlet pH=7.12～7.81, sludge ceramsite post water outlet pH=7.14～7.85, rangeability is all little.
Treatment effect under the different hydraulic loads
For investigating the treatment effect of two covering devices under different hydraulic loads, choose 3 kinds of different hydraulics, its hydraulic load is respectively 0.214m
3/ m
2H
-1, 0.428m
3/ m
2H
-1, 0.856m
3/ m
2H
-1, hydraulic detention time is respectively 3h, 1.5h, 0.75h, its result as shown in Figure 3:
As seen from Figure 3, under three kinds of hydraulics, sludge ceramsite post and commodity haydite post all have good removal effect to CODcr, and clearance all is stabilized in more than 80%; When HRT was 3h and 1.5h, two posts were to NH
3The removal effect of-N is good, when HRT is 0.75h to NH
3The removal effect of-N all obviously descends, but the removal effect of sludge ceramsite post will be significantly better than commodity haydite post at this moment.
Pollutant removal is along the packed height changing conditions
This device is that 30cm, 50cm, 70cm, 90cm, 110cm place are provided with thief hole at bed stuffing height, under different hydraulics the treatment effect at two covering device different heights places as shown in Figure 4, as seen from Figure 4:
(1) under three kinds of different hydraulics, the removal of CODcr mainly concentrates on preceding half section: when packed height was 30cm, the clearance of CODcr had reached about 50%, steadily rose then, reached 80% to 90cm place clearance.This is because carbon source abundance in preceding half section water inlet, and microorganism growth is rapid, and biomass is bigger, and along with the minimizing of carbon source in the water sample, microbial biomass also reduces thereupon.
(2) and NH
3The removal of-N mainly concentrates on the second half section: when packed height is 50cm, and NH
3The clearance of-N is about 30% only, and clearance rises comparatively fast between 50～90cm, and this is because at preceding half section aerobic heterotrophic bacterium raised growth, suppressed the breeding of nitrobacteria, and along with rising highly, the aerobic heterotrophic bacterium in the filler reduces, nitrobacteria is able to raised growth, thereby to NH
3The clearance of-N is able to rapid raising.
(3) in general, sludge ceramsite post and commodity haydite post are to CODcr and NH
3The removal effect of-N is more approaching, and the sludge ceramsite post also has certain advantage in most of experimental phase, and this may be that the specific surface area of sludge ceramsite is bigger, the cause that the microbial biomass that adheres to is more.
Treatment effect under the higher Pollutant levels
Above-mentioned institute is not high with the Pollutant levels of preparation waste water, and CODcr is about 200mg/L, NH
3-N is about 20mg/L, in order to investigate the processing power of two covering devices to higher concentration waste water, influent concentration is heightened, and CODcr is about 350mg/L, and NH3-N is about 30mg/L, and its treatment effect as shown in the figure.As seen from Figure 5, the removal effect of sludge ceramsite post and commodity haydite post is more approaching under higher Pollutant levels.The clearance of CODcr still is stabilized in more than 80%, but NH
3The clearance of-N but drops to less than 60%, and this is that the heterotrophic microorganism raised growth has suppressed the growth of autotrophy nitrobacteria and denitrifying bacterium, thereby caused NH because CODcr concentration is higher
3The removal effect of-N is undesirable.
The experimental study that the sludge ceramsite BAF is handled actual waste water
Actual sewage is taken from the preliminary sedimentation tank water outlet of Jinan City's purification of water quality one factory, and CODcr is about 150mg/L, BOD
5Be about 35mg/L, the pH value is about 7.3～7.8.Two covering devices to the disposition of actual waste water as shown in Figure 6 and Figure 7, two covering devices all have treatment effect preferably to actual waste water: CODcr concentration has all reached the one-level A standard of " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002), NH
3-N emission concentration reaches secondary standard, and turbidity removal rate is near 100%.
Conclusion
(1) in the processing to synthetic sewage, the treatment effect of sludge ceramsite post all is not weaker than commodity haydite post under the different operational conditionss.
(2) in the processing to real life sewage, two covering devices all have treatment effect preferably to actual waste water: COD concentration has reached the one-level A standard of " urban wastewater treatment firm is as staining emission standard " (GB 18918-2002), NH
3-N emission concentration reaches secondary standard, and turbidity removal rate is near 100%.
Embodiment 2: the example of anoxic/aerobic integrated formula sludge ceramsite biofilter to treat domestic sewage
Experimental installation
The synthetic glass post of diameter 100mm, high 1600mm, net sectional area 78.5cm are adopted in the A/O biological filter
2(see figure 8).As filler, whole admission space is 9L to packing layer with spherical sludge ceramsite; After filling filler, the useful volume in the post is 5L, and the useful volume of submergence packing layer part is 2.5L.4 thief holes 16 are offered successively along height for reactor in the filter tank, lay respectively at oxygen-starved area 19 ends, aerobic zone 17 middle parts, aerobic zone 17 ends and reactor head, are respectively 250mm, 700mm, 1100mm and 1450mm apart from the filter tank feed-water end.The bottom, filter tank is provided with raw water inlet, recirculation water water-in and back flushing water-in; Oxygen-starved area 19 filler floor height 250mm fill the 2L sludge ceramsite; Aeration gas distribution floor height 50mm is provided with two aeration heads 18 and uses for operation aeration and back flushing aeration respectively; Aerobic zone 17 filler floor height 800mm fill the 7L sludge ceramsite, and promptly oxygen-starved area 19 and aerobic zone 17 are than being about 1: 3; Aerobic zone 17 and oxygen-starved area 19 are covered pebbles and are prevented to stop up by the flange support that is covered with micropore on the flange; Buffer layer 15 high 350mm, the 50mm place is provided with water outlet apart from body top, pond.
Result and discussion
Hydraulic detention time (HRT) is to the influence of sanitary sewage disposal effect
According to the useful volume of reactor, be steady running 2d under the condition of 0.5h, 1.0h, 1.5h, 2.0h, 2.5h at hydraulic detention time (HRT) respectively; Reflux ratio is 1: 1, and gas-water ratio is 5: 1,19～25 ℃ of water temperatures; Former water flooding quantity is 0.5～2.5Lh
-1, aeration rate is 0.08～0.42Lmin
-1HRT sees Table 4 to the removal effect of all contaminations.
Table 4HRT is to the influence of sanitary sewage disposal effect
As shown in table 4, along with the prolongation of HRT, CODcr and NH
3The clearance of-N is in rising trend.Wherein the removal effect of CODcr and HRT have the better linearity dependency; And NH
3-N is subjected to the influence of HRT less except that HRT=0.5h, and clearance is near 100%.But the influence that TN is subjected to HRT is comparatively complicated, occurs removing peak value at 2.0h, further prolongs the residence time the removal of TN not to be produced better effect.
HRT more in short-term, organic loading, flooding velocity and aeration rate are corresponding higher, make reactor be subjected to bigger impact load and stronger air water shearing force, the biological filter is to CODcr, NH
3The removal effect of-N and TN is relatively poor; Because the anoxic section can not effectively utilize water-inlet carbon source, the organic concentration that enters aerobic section is higher, heterotrophism aerobic bacteria and autotrophy ammonia oxidation bacteria, nitrifier intensified competition, and nitrifying process is subjected to obvious inhibition, and then directly has influence on the effect of oxygen-starved area denitrogenation.In addition, high aeration rate makes the backflow dissolved oxygen in water enter the oxygen-starved area, has further suppressed this section microbic activity.The prolongation of HRT, anoxic zone microorganisms can be utilized water-inlet carbon source more efficiently, makes the spatial distribution of aerobic zone microorganism more help nitrifying process; But HRT is long, and organic loading reduces, and the denitrifying bacteria of oxygen-starved area can not get enough carbon sources, and carbon source becomes the restricted factor of denitrogenation.Relatively comprehensive, when HRT was 2.0h, CODcr can reach the removal effect near 90%, NH
3-N nitrifying process is nearly 100%, the clearance of TN be each residence time, so that this filter tank is moved under the 2.0h hydraulic detention time is best.
Gas-water ratio (A/L) is to the influence of sanitary sewage disposal effect
Test conditions: HRT is 2.0h, and former water flooding quantity is 0.625Lh
-1, reflux ratio is 1: 1, gas-water ratio was respectively 5: 1,10: 1,15: 1,20: 1,25: 1, promptly aeration rate be 0.1,0.2,0.3,0.4,0.5Lmin
-1Table 5 is treatment effects of each pollutent under the different gas-water ratios.
Table 5 gas-water ratio is to the influence of sanitary sewage disposal effect
Table 5 shows: gas-water ratio is in close relations to the removal effect of organism and total nitrogen, and is less to the influence of ammonia nitrogen.Suitably increase gas-water ratio effect of mass transmitting is strengthened, both strengthened the nitrification of aerobic zone, increased the nitric nitrogen and the nitrite nitrogen concentration that enter the oxygen-starved area; In addition, owing to contain difficult degradation composition such as Zulkovsky starch in the former water, carry an amount of dissolved oxygen in the recirculation water and enter the oxygen-starved area, make the facultative acidication bacterium of this section will be difficult to be converted into by the carbon source that denitrifying bacteria utilizes and can utilize carbon source, denitrification activity improves greatly.Improve gas-water ratio within the specific limits, the air water turbulent flow that produces helps aging biomembranously coming off, upgrading to the souring of biofilm surface, can prevent because of microbial film increases the blocked up inside anaerobism that causes, very crucial to the stabilizing treatment effect of biomembranous renewal and maintenance BAF.But after gas-water ratio delimited above one, the too high dissolved oxygen in shearing force that aerobic zone is strong excessively and oxygen-starved area all produced negative effect to the operation of system; In addition, gas-water ratio is too high will increase power consumption and running cost.Relatively comprehensive, be 15: 1 o'clock in gas-water ratio, each pollutant removal is more excellent relatively.
Packed height is to the influence of sanitary sewage disposal effect
For inquiring into A/O bio-filter stuffing layer height to individual pollutant removal, at anaerobic zone end, aerobic zone middle part and aerobic zone end 3 sampling spots are set, be respectively 250mm, 700mm and 1100mm apart from water-in.What Fig. 3-2 represented is different gas-water ratios and following, CODcr, NH
3-N, TN and NO
3-N is with the changing conditions (annotate: the figure camber is that each pollutent numerical value of 0cm place is recirculation water and the mixed concentration value of former water) of packed height.
Fig. 9 (a) shows that CODcr mainly is degraded in the oxygen-starved area, and acidication effect and denitrification utilize former water carbon source to finish the conversion of macromole carbon to small molecules carbon, and the denitrification denitrogenation process.Enter aerobic zone, organic concentration is at 50mgL
-1About, the heterotrophism aerobic bacteria is very faint to the Degradation of CODcr, is slow downtrending, promptly and at oxygen-starved area end (25cm) finishes substantially organic degradation process.Experimentation is also found: the light yellow microbial film that is wrapped in the sludge ceramsite surface can obviously be observed once in aerobic zone middle part, and does not observe substantially more than the middle part, and preceding half section and the second half section is respectively heterotrophic bacterium and autotrophic bacteria is preponderated at aerobic zone be described.Fig. 9 (b) shows, enter reactor after, NH
3-N is remarkable downtrending substantially in oxygen-starved area and aerobic zone leading portion, but is higher than influent concentration when gas-water ratio is low, and this may ammonolysis take place with the organonitrogen in the former water in the oxygen-starved area relevant.At oxygen-starved area NH
3-N can with NO
2 -The Anammox effect takes place-N reduces concentration, enters aerobic zone and be converted into NO under the effect of supporting ammonia oxidation bacteria and nitrifier well
2 --N and NO
3 --N, NH
3-N further reduces.But the aerobic zone second half section, ammonia concentration is substantially at 1mgL
-1About and NO
3 --N concentration is kept stable (Fig. 9 (d)) also, illustrates that reactor is to NH
3The removal effect of-N is that the 70cm place finishes substantially in packed height.
The treatment of organic matters of organic effect has similar trend (Fig. 9 (c)) in the removal effect of TN and the water, consume dissolved oxygen in the recirculation water in oxygen-starved area leading portion acidication process, and denitrifying bacteria utilizes nitrate and nitrite to finish denitrification process as electron acceptor(EA).About 3%, the consumption of nitrogen mainly is that the assimilation of this section microorganism growth breeding makes so at aerobic zone TN clearance.Shown in Fig. 9 (d), the end in the oxygen-starved area is NO
3 -The flex point of-N change in concentration, this is that denitrification and nitrification are in difference in functionality district results of interaction.In addition, from NH
3-N and NO
3 -N sees in the change in concentration trend of aerobic zone, suitably improves the making full use of of nitrification function that ammonia nitrogen loading more helps aerobic zone.
Reflux ratio is to the influence of sanitary sewage disposal effect
At hydraulic detention time is 2.0h, and gas-water ratio is under 15: 1 the condition, and reactor is 100%, 200% and 300% to move a week respectively with reflux ratio, and the gained result as shown in figure 10.
Figure 10 (a) shows: reflux ratio is 100%, 200% and 300% o'clock, and the average removal rate of aerobic zone CODcr is respectively 86.01%, 89.88% and 88.11%, and corresponding oxygen-starved area average removal rate is 78.32%, 86.80% and 85.99%.As can be seen, the clearance of CODcr is also insensitive to reflux ratio, and mainly is removed in the oxygen-starved area, and the CODcr of aerobic zone removes very faint.To ammonia nitrogen, although its concentration is at 13.14mgNL in the oxygen-starved area
-1With 7.42mgNL
-1Between change, but aerobic zone water outlet change in concentration is only at 0.38mgNL
-1And 1.65mgNL
-1Between the change.Figure 10 (a) shows that with Figure 10 (b) CODcr occurs in different functional zone with the removal of ammonia nitrogen, has therefore avoided good competition of supporting section heterotrophic bacterium and aerobic bacteria effectively, and nitrifying process is fully carried out.Figure 10 (c) is the removal effect figure of total nitrogen, along with the removal effect of the increase total nitrogen of reflux ratio is respectively 6.95%, 66.27% and 69.38%.Similar to the CODcr removal, reflux ratio and aerobic zone are to the DeGrain of denitrogenation.And Figure 10 (d) has illustrated that nitric nitrogen is the principal mode of water outlet total nitrogen, the total nitrogen that accounts for respectively under different reflux ratios is removed 76.62% of share, 66.34% and 70.30%, the form of other nitrogen also comprises ammonia nitrogen, nitrite, organonitrogen and at the nitrogen of experimentation because of losses such as ammonia nitrogen volatilizations.
The factor that influences the total nitrogen removal effect is a lot, the compounded carbons that the glucose of selecting for use in this experiment, Zulkovsky starch and sodium acetate are formed, CODcr/N is 8.29 to 11.56, be not less than 15 threshold value than the desired CODcr/N of preposition nitration denitrification low, causes influent quality that the effect of denitrogenation is produced remarkably influenced.In addition, back flushing is carried out once every day, makes the oxygen-starved area at the too high inhibition denitrification process of dissolved oxygen concentration for a long time.
PH is with the variation of reflux ratio and packed height
Table 6 shows: water inlet pH is slightly acidic, near neutral.And rise near 8.0 through pH behind the oxygen-starved area, considerable change does not take place by pH behind the aerobic zone.Usually, denitrification process can make basicity increase and cause pH to rise, and nitrification consumes basicity descends pH.The data of table 6 show that tangible pH decline does not take place aerobic zone in this water inlet system, and this explanation BAF system has stronger surge capability.On the one hand, contain the buffer substance such in the water inlet just like sodium acetate, on the other hand, the multiple mineral compound that contains in the sludge ceramsite, such as CaO, MgO, K
2O, Na
2O, Fe
2O
3And AI
2O
3Deng, erosion action takes place in the sewage to be discharged, sewage pH value is produced shock absorption.In addition, under different reflux ratios, significance does not all take place at the pH of different piece and changes in system, illustrates that reactor is a very powerful buffer system, and the variation of pH is not obvious to reflux ratio.
Table 6pH is with the variation of reflux ratio and packed height
To sum up, the optimum process condition of anoxic/aerobic integrated formula sludge ceramsite biological filter operation is: hydraulic detention time 2.0h, gas-water ratio 15: 1, reflux ratio 200%.90%CODcr under this operational conditions, the ammonia nitrogen more than 98% and nearly 70% total nitrogen are removed.The removal of CODcr and total nitrogen mainly occurs in the oxygen-starved area, the removal of ammonia nitrogen at aerobic zone middle part to finish substantially.Sewage quality and back flushing influence total nitrogen and remove greatlyyer, and in addition, the characteristic of sewage quality and sludge ceramsite makes the BAF system have stronger surge capability, and reflux ratio influences very little to pH.
Claims (2)
1. a sludge ceramsite is in Application of Sewage, it is characterized in that, be used for biological filter or fluidized bed bio reactor as the sewage disposal filler, described sludge ceramsite density rating is in 600～900 the biological filter that is applied to, run parameter was as follows when sludge ceramsite was applied to the biological filter: hydraulic detention time 2.0h, gas-water ratio 15, reflux ratio 200%, packed height 75cm.
2. application as claimed in claim 1 is characterized in that, each constituent mass of described sludge ceramsite is than being mud: flyash: clay=1～3: 1～2: 0.5～1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101383138A CN101327987B (en) | 2008-07-08 | 2008-07-08 | Use of sludge porcelain granule in sewage disposal |
Applications Claiming Priority (1)
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| CN101773751B (en) * | 2009-12-30 | 2012-05-30 | 山东大学 | Lightweight cathode and anode water treatment filter material and preparation method thereof |
| CN105481094B (en) * | 2016-01-20 | 2018-06-01 | 无锡华光锅炉股份有限公司 | It is a kind of for the ceramics filling of sewage disposal, production method and sewage-treatment plant |
| CN108675815B (en) * | 2018-05-25 | 2021-06-11 | 南昌大学 | Preparation method of fly ash sludge ceramsite |
| CN110143663A (en) * | 2019-05-27 | 2019-08-20 | 悉地（苏州）勘察设计顾问有限公司 | A kind of method of filler design parameter in determining biological delaying basin |
| CN110407559A (en) * | 2019-07-30 | 2019-11-05 | 南京信息工程大学 | A kind of modified haydite and its application |
| CN111099914B (en) * | 2019-12-31 | 2021-11-12 | 浙江大学 | Sludge-based ceramsite filter material for biological aerated filter, and preparation method and application thereof |
| CN111393142A (en) * | 2020-03-28 | 2020-07-10 | 普尔顿环保科技(海南)有限公司 | Biomass sludge ceramsite and preparation method and application thereof |
| CN112062593B (en) * | 2020-04-02 | 2023-05-02 | 武汉理工大学 | Novel environment-friendly ceramsite, preparation method thereof and application thereof in wastewater treatment |
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| CN1109850A (en) * | 1995-01-25 | 1995-10-11 | 北京市环境卫生科学研究所 | Method for producing haydite from refuse or mud |
| CN1371883A (en) * | 2001-02-28 | 2002-10-02 | 同济大学 | Method for firing building material products by utilizing contaminated river bottom mud |
| CN1136166C (en) * | 1999-01-22 | 2004-01-28 | 昆明理工大学 | Technical process for producing light haydite |
| CN101148346A (en) * | 2007-09-04 | 2008-03-26 | 山东大学 | Method for preparing haydite from urban sewage plant sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1109850A (en) * | 1995-01-25 | 1995-10-11 | 北京市环境卫生科学研究所 | Method for producing haydite from refuse or mud |
| CN1136166C (en) * | 1999-01-22 | 2004-01-28 | 昆明理工大学 | Technical process for producing light haydite |
| CN1371883A (en) * | 2001-02-28 | 2002-10-02 | 同济大学 | Method for firing building material products by utilizing contaminated river bottom mud |
| CN101148346A (en) * | 2007-09-04 | 2008-03-26 | 山东大学 | Method for preparing haydite from urban sewage plant sludge |
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