CN101525207A - Integrated pre-denitrification and denitrogenation biological filter sewerage treatment process - Google Patents
Integrated pre-denitrification and denitrogenation biological filter sewerage treatment process Download PDFInfo
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- CN101525207A CN101525207A CN200910116556A CN200910116556A CN101525207A CN 101525207 A CN101525207 A CN 101525207A CN 200910116556 A CN200910116556 A CN 200910116556A CN 200910116556 A CN200910116556 A CN 200910116556A CN 101525207 A CN101525207 A CN 101525207A
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Abstract
The invention discloses an integrated pre-denitrification and denitrogenation biological filter sewerage treatment process. The integrated process is characterized in that: the process is realized by combining an anoxic denitrification biological filter and an aerobic nitrification biological filter in tandem, first, sewage with organic substances and ammonia nitrogen is mixed with part of effluent water of the aerobic nitrification biological filter which flows back to a water inlet end, then the sewage and the effluent water pass the anoxic denitrification biological filter together, and the organic substances in the sewage are taken as a carbon source by denitrifying bacteria adhesively growing on bio-ceramsite in the anoxic denitrification biological filter to reduce nitrate nitrogen from the return water of the aerobic nitrification biological filter into nitrogen gas, thus realizing denitrification function; and the effluent water of the anoxic denitrification biological filter flows to the aerobic nitrification biological filter, and a filter material in the aerobic nitrification biological filter is adhered with special growing aerobic decarbonization microbes and the growing denitrifying bacteria which further degrade the organic substances and the ammonia nitrogen from the anoxic denitrification biological filter, thus causing content indicators of the organic substances, the ammonia nitrogen, total nitrogen and the like in the effluent water of the aerobic nitrification biological filter to meet the discharge requirement.
Description
Technical field
The invention belongs to biomembrance process technical field of sewage, particularly relate to the anoxic denitrification biological filter that a kind of employing need not energy consumption and the sewage disposal integrated technique of aerobic nitrification biological filter series combination based on the biological filter.The anoxic denitrification biological filter is to utilize the denitrifying bacteria microbial film that is attached on the spherical light porous biological ceramic particle fixed bed to finish to the removal of nitrogen, and the aerobic nitrification biological filter is to utilize the aerobic de-carbon microorganism of obligate, the nitrifier microbial film that are attached on the spherical light porous biological ceramic particle fixed bed to finish to the nitrated of organic removal and ammonia nitrogen; This technology except that to the removal effect of organic pollutant in the sewage well, particularly the nitrogen in the sewage there is good removal effect, (GB18918-2002) the one-level A standard of country's " urban wastewater treatment firm pollutant emission standard " that reaches directly can be handled in cities and towns and community life sewage, and can be directly as industrial circulating water, reclaimed water, municipal landscape water, conserve water resource.
Background technology
Along with the propelling that the quickening of Urbanization in China, residential quarters, cities and towns are built, the quantity discharged of cities and towns and community life sewage is increasing, and is serious day by day to the pollution of surface water body, and the sustained economic growth of China has been produced serious bottleneck effect.For a long time, China except paying attention to the control to organic pollutant in the sewage always, especially strengthened pollution control in recent years to the plant nutrient " nitrogen " that causes body eutrophication, controlling index increasingly stringent to total nitrogen in the sewage that enters water body, " the urban wastewater treatment firm pollutant emission standard " of the new promulgation of China (GB18918-2002) had higher requirement to the water quality that the sewage after handling enters water body, lay special stress on to the strictness of total nitrogen control, so in removing sewage in the organic pollutant, can remove the new problem that total nitrogen content in the sewage has become current sewage treatment technology again effectively.
In recent years, the biomembrance process sewage disposal technology has obtained extensive studies and application, wherein biological filtering tank process is so that it is effective to organic matter removal, working cost is low, floor space is little, initial cost is low, handle load height, anti impulsion load, operation start research and the application focus that characteristics such as fast become this field, and applied in fields such as sanitary sewage and Industrial Wastewater Treatment.But because the aerobic biofilter that present research and application mainly concentrate on based on single-stage, two-stage series connection also is a biological aerated filter process, just pay attention to the removal of the organic pollutant in the sewage such as BOD, COD and the ammonia nitrogen in the sewage can only be oxidized to nitrate nitrogen, from sewage, overflow and be able to thorough removal and nitrate nitrogen can not be converted into nitrogen, also be that total nitrogen in the sewage is not removed, such water enters surface water body still can produce pollution to water body, may make water body produce eutrophication.For the advantage of giving full play to conventional biological filtering tank process is excavated the removal potential of biological filter to total nitrogen in the sewage simultaneously, so develop economy and the environmental development strategy that novel technique that a kind of organic pollutant that can remove in the sewage can thoroughly be removed the nitrogen in the sewage again simultaneously will meet China.
Summary of the invention
The invention provides a kind of need not energy consumption the anoxic denitrification biological filter and the sewage disposal integrated technique of aerobic nitrification biological filter series combination.
Technological process of the present invention is:
A, the sewage of sending here from sewage water inlet pipe 25 that contains organism and ammonia nitrogen earlier be back to the part aerobic nitrification biological filter water outlet that water into brings in from reflux pump 18 through return line 19 and mix, the common then inlet channel 1 from anoxic denitrification biological filter 5 enters anoxic denitrification biological filter 5, enter supporting layer 3 by water distribution system 2, and then the spherical light porous biological ceramic particle layer 4 of supporting layer 3 tops of flowing through for the denitrifying bacteria apposition growth, spherical light porous biological ceramic particle 4 has very big specific surface area, surface irregularity and porous, domestication is attached with highdensity denitrifying bacteria above.Denitrifying bacteria utilizes organism in the sewage as carbon source, aerobic nitrification biological filter 9 is back to nitrate nitrogen in the anoxic denitrification biological filter 5 through reflux pump 18, return line 19 to be reduced to nitrogen and to overflow from water and enter in the atmosphere, finish denitrification process, the most suspended substances in the sewage is trapped within the space of biological ceramic particle layer simultaneously.Water through the light porous biological ceramic particle layer of sphere 4 behind the biological and mechanical degradation is through clear water zone 6 and go out water channel 7 oneself flows into the aerobic nitrification biological filter by the rising pipe 8 of anoxic denitrification biological filter 5.
Water outlet after handle b, process anoxic denitrification biological filter 5 enters aerobic nitrification biological filter 9 by rising pipe 8, carries out the degraded of the nitrated and residual organic substances of ammonia nitrogen.The structure of aerobic nitrification biological filter 9 and denitrification bio-filter 5 is the same substantially, respectively by water distribution system 20, supporting layer 21, spherical light porous biological ceramic particle layer 22, clear water zone 23, go out water channel 24 and form, but because oxygen need be supplied with in aerobic nitrification biological filter 9 in the biological ceramic particle layer, so set up highly effective air diffuser system 17; Required air is provided by gas blower 15, through steam line 16 conveyings and highly effective air diffuser system 17 oxygen supply in the water of nitrated biological filter in being installed on supporting layer 21, make nitrifier and the obligate aerobic de-carbon microorganism of apposition growth on the light porous biological ceramic particle layer 22 of sphere under aerobic conditions, carry out aerobic respiration, metabolism by microbial bacterial is with remaining organic pollutant in the sewage, ammonia nitrogen carries out oxygenolysis, organic pollutant is decomposed into carbonic acid gas and water, ammonia nitrogen is oxidized to nitrate nitrogen, thereby sewage is purified enter clear water zone 23 and finally by rising pipe 11 water outlet is effluxed through going out water channel 24, go out water after the partially disposed in the water channel 24 by reflux pump 18 and will come from nitrate nitrogen in the water outlet of aerobic nitrification biological filter through return line 19 and be back to the anoxic denitrification biological filter and carry out denitrification denitrogenation, under the effect of denitrifying bacteria, nitrate nitrogen is reduced to nitrogen, thereby realizes the purpose of denitrogenation from sewage.
C, dissolved oxygen on-line detector device 10 is installed in aerobic nitrification biological filter final outflow water canal 24, the online water quality detection instrument 14 of nitrate nitrogen is installed in sewage water inlet pipe 25 and aerobic nitrification biological filter final outflow water canal 24, by the sequence of control of special exploitation according to 10,14 online monitoring data that record, by PLC computer workstation system 12, umbilical cable 13 is regulated the backflow water yield of reflux pump 18 and gas blower 15 and the air demand of gas blower, quantity of reflux and air demand that reflux pump 18 and gas blower 15 supplied with satisfy operating requirement just, farthest save power consumption under the prerequisite guaranteeing that effluent quality meets the requirements of.
It is good that integrated pre-denitrification and denitrogenation biological filter sewerage treatment process of the present invention has a denitrification effect, organic matter removal efficient height, it is high to handle load, energy consumption is low, hydraulic detention time is short, effluent quality is good, the characteristics that sludge yield is few, with existing single-stage, the aerobic biofilter and the sewage disposal process by activated sludge process of two-stage series connection are compared, its innovative point is good to the pollutants in sewage removal effect, the removal efficient height that particularly common process is difficult to the nitrogen pollutant of steady removal, make the organic pollutant in the final treat effluent water quality, total nitrogen, ammonia nitrogen, major control index concentration such as suspended substance are well below up-to-date " urban wastewater treatment firm pollutant emission standard " the one-level A standard of country, the emission request for the treatment of water is not only satisfied in water outlet, and can be with sewage disposal to directly as industrial circulating water by the present invention, reclaimed water, the reuse of municipal administration landscape water has not only been administered the water pollution but also has been saved water resources.
Description of drawings
Fig. 1 is an integrated pre-denitrification and denitrogenation biological filter sewerage treatment process schematic flow sheet of the present invention.
Embodiment
As shown in Figure 1, mix through the water outlet that return line 19 is back to the part aerobic nitrification biological filter 9 that water into brings in earlier with from reflux pump 18 by the treatment sewage of sewage water inlet pipe 25, the common then inlet channel 1 from anoxic denitrification biological filter 5 enters anoxic denitrification biological filter 5, this pond is in anoxic condition all the time when working, and the dissolved oxygen solubility in the maintenance pond is less than 0.5mg/L, owing to contain a large amount of nitrate nitrogens in the effluent recycling liquid of aerobic nitrification biological filter, and contain a large amount of organism in the sewage, during spherical light porous biological ceramic particle layer 4 in combined sewage is flowed through anoxic denitrification biological filter 5, adhering to denitrifying bacteria on it utilizes organism in the sewage as carbon source, physiology by denitrifying bacteria and metabolism are reduced to nitrogen with the nitrate nitrogen in the water and overflow from water and enter in the atmosphere, finish denitrification process, most suspended substances in the sewage is trapped within the space of biological ceramic particle layer simultaneously, suspended substance in this pond water outlet is reduced greatly, organic pollutant in nitrate nitrogen in this process degradable mixing water more than 85% and the sewage more than 60%, and do not need energy consumption, can also produce oxygen on the contrary to replenish the part oxygen requirement of follow-up aerobic nitrification biological filter, working cost is extremely low; Water outlet after handle anoxic denitrification biological filter 5 enters effluent trough 7 and enters the aerobic degradation processing that the nitrated and residual organic substances of ammonia nitrogen is carried out in follow-up aerobic nitrification biological filter 9 by rising pipe 8, also pass through under the condition of highly effective air diffuser system 17 oxygen supply in the water of nitrated biological filter at gas blower 15 and steam line 16, make nitrifier and the obligate aerobic de-carbon microorganism of apposition growth on the light porous biological ceramic particle layer 22 of sphere under aerobic conditions, pass through its physiology and metabolism, residual organic substances and the ammonia nitrogen that does not have to have degraded in the anoxic denitrification biological filter carried out aerobic thorough decomposition, organic pollutant is decomposed into carbonic acid gas and water, ammonia nitrogen is oxidized to nitrate nitrogen, filteration by the spherical light porous biological ceramic particle layer 22 of fixed bed makes water outlet limpid simultaneously, make organism in the final outflow water, ammonia nitrogen, total nitrogen, nitrate nitrogen, indexs such as SS reach country's " urban wastewater treatment firm pollutant emission standard " one-level A standard, and can be directly as industrial circulating water, reclaimed water, the reuse of municipal administration landscape water.Farthest save power consumption under the prerequisite for guaranteeing that effluent quality meets the requirements of, nitrate nitrogen, dissolved oxygen water-quality guideline on-line detector device 14,10 are installed in sewage water inlet pipe 25 and final outflow water canal 24, and will detect data and feed back to PLC computer workstation system 12, sequence of control by special exploitation comes automatic dynamic to adjust the rotating speed of reflux pump 18 and gas blower 15 by frequency transformer, and quantity of reflux and air demand that reflux pump 18 and gas blower 15 are supplied with satisfy operating requirement just.
With the contriver according to the present invention technology implement with sanitary sewage disposal to the country " urban wastewater treatment firm pollutant emission standard " one-level A standard be described further:
Certain municipal effluent, the discharge of sewage is 10000 ton per days, enters the preceding pollutent index of this art breading to be: COD=300mg/L, SS=150mg/L, ammonia nitrogen=25mg/L, total nitrogen 30mg/L.This sewage and follow-up aerobic nitrification biological filter recirculation water at first enter 2 anoxic denitrification biological filters after mixing, reflux ratio 100%, hydraulic detention time HRT=0.4hr, upflow velocity 10m/h, pond body height overall 6.9m, available depth 6.4m in the pond, inside is provided with filter plate, filter plate high 1.2m at the bottom of the pond, filter plate top is equipped with the high supporting layer of 0.3m, is the spherical light porous biological ceramic particle of diameter of phi 4 ~ 6mm of 4m height above the supporting layer, it above the biological ceramic particle layer the high clear water zone of 0.9m, superelevation 0.5m through the effluent quality index after this anoxic denitrification biological filter processing is: COD=90～110mg/L, SS=40mg/L, ammonia nitrogen=10mg/L, nitrate nitrogen 2mg/L, total nitrogen 12mg/L, this water outlet is further handled from flowing into 4 follow-up aerobic nitrification biological filters.Pond, aerobic nitrification biological filter body height overall 7m, available depth 6.5m in the pond, inside is provided with filter plate, filter plate high 1.2m at the bottom of the pond, filter plate top is equipped with the high supporting layer of 0.3m, it above the supporting layer the spherical light porous biological ceramic particle of diameter of phi 1.8 ~ 3mm of 4m height, it above the biological ceramic particle layer the high clear water zone of 1m, superelevation 0.5m, the oxygen supply in water of highly effective air diffuser system is installed in the supporting layer of biological ceramic particle layer bottom, water outlet after handle the anoxic denitrification biological filter is adhered in the aerobic nitrification biological filter under the effect of aerobic de-carbon microorganism of the obligate that is grown on the biological ceramic particle and nitrifier and is carried out aerobic respiration, remaining organic pollutant is decomposed into carbonic acid gas and water, ammonia nitrogen is oxidized to nitrate nitrogen, the biofilter material layer filters the suspended substance in the water simultaneously, make the pollutent index of final outflow water be: COD≤30mg/L, total nitrogen≤10mg/L, SS≤5mg/L, ammonia nitrogen≤1mg/L, reach (GB18918-2002) one-level A emission standard of country's " urban wastewater treatment firm pollutant emission standard ", and direct reuse is made power plant's circulation make up water after sterilizing.
Claims (7)
1, a kind of integrated pre-denitrification and denitrogenation biological filter sewerage treatment process, described sewage treatment process is as follows:
A, by the sewage of sending here from sewage water inlet pipe (25) that contains organism and ammonia nitrogen earlier be back to the part aerobic nitrification biological filter water outlet that water into brings in from reflux pump (18) through return line (19) and mix, enter anoxic denitrification biological filter (5) from the inlet channel (1) of anoxic denitrification biological filter (5) jointly then, enter supporting layer (3) by water distribution system (2), and then the supporting layer of flowing through (3) top is for the spherical light porous biological ceramic particle layer (4) of denitrifying bacteria apposition growth, spherical light porous biological ceramic particle (4) has very big specific surface area, surface irregularity and porous, domestication is attached with highdensity denitrifying bacteria above; Denitrifying bacteria utilizes organism in the sewage as carbon source, aerobic nitrification biological filter (9) are reduced to nitrogen through the nitrate nitrogen that reflux pump (18), return line (19) are back in the anoxic denitrification biological filter, finish denitrification process, the most suspended substances in the sewage is trapped within the space of biological ceramic particle layer simultaneously; Water after the light porous biological ceramic particle layer of sphere (4) degraded is through clear water zone (6) and go out water channel (7) and flow into aerobic nitrification biological filter (9) certainly by the rising pipe (8) of anoxic denitrification biological filter (5).
Water outlet after handle b, process anoxic denitrification biological filter (5), enter aerobic nitrification biological filter (9) by rising pipe (8), aerobic nitrification biological filter (9) is the same substantially with the structure of denitrification bio-filter (5), respectively by water distribution system (20), supporting layer (21), spherical light porous biological ceramic particle layer (22), clear water zone (23), go out water channel (24) and form, set up highly effective air diffuser system (17) in aerobic nitrification biological filter (9); Required air is provided by gas blower (15), through steam line (16) conveying and highly effective air diffuser system (17) oxygen supply in the water of nitrated biological filter in being installed on supporting layer (21), make nitrifier and the obligate aerobic de-carbon microorganism of apposition growth on the light porous biological ceramic particle layer of sphere (22) under aerobic conditions, carry out aerobic respiration, metabolism by microbial bacterial is with remaining organic pollutant in the sewage, ammonia nitrogen carries out oxygenolysis and is separately converted to carbonic acid gas, water and nitrate nitrogen, thereby sewage is purified enter clear water zone (23) and finally by rising pipe (11) water outlet is effluxed through going out water channel (24), going out water after the partially disposed in the water channel (24) by reflux pump (18) and will come from nitrate nitrogen in the water outlet of aerobic nitrification biological filter through return line (19) and be back to the anoxic denitrification biological filter and carry out denitrification denitrogenation, is nitrogen with nitrate-nitrogen reduction under the effect of denitrifying bacteria.
C, dissolved oxygen on-line detector device (10) is installed in aerobic nitrification biological filter final outflow water canal (24), in sewage water inlet pipe (25) and aerobic nitrification biological filter final outflow water canal (24), the online water quality detection instrument of nitrate nitrogen (14) is installed, sequence of control basis (10) by special exploitation, (14) online monitoring data that records, by PLC computer workstation system (12), umbilical cable (13) is regulated reflux pump (18) and the backflow water yield of gas blower (15) and the air demand of gas blower, quantity of reflux and air demand that reflux pump (18) and gas blower (15) are supplied with satisfy operating requirement just, farthest save power consumption under the prerequisite guaranteeing that effluent quality meets the requirements of.
2, integrated pre-denitrification and denitrogenation biological filter sewerage treatment process as claimed in claim 1, it is characterized in that: anoxic denitrification biological filter (5) adopt upward flow waterpower form, and the filter tank is inner bottom-up respectively by water distribution system (2), supporting layer (3), spherical light porous biological ceramic particle layer (4), clear water zone (6) with go out water channel (7) and form; Spherical light porous biological ceramic particle (4) has very big specific surface area, participating in denitrifying denitrifying bacteria mainly adheres on it, denitrifying bacteria utilizes organism in the sewage as carbon source, the nitrate nitrogen that aerobic nitrification biological filter (9) is back in the recirculation water of anoxic denitrification biological filter (5) is reduced to nitrogen, finish denitrification process, most of organism in the sewage of in this process, having degraded simultaneously.
3, integrated pre-denitrification and denitrogenation biological filter sewerage treatment process as claimed in claim 1, it is characterized in that: aerobic nitrification biological filter (9) adopt upward flow waterpower form, and the filter tank is inner bottom-up respectively by water distribution system (20), supporting layer (21), highly effective air diffuser system (17), spherical light porous biological ceramic particle layer (22), clear water zone (23) with go out water channel (24) and form; Spherical light porous biological ceramic particle (22) has very big specific surface area, participate in the aerobic de-carbon microorganism of obligate of reaction and nitrifier apposition growth on it, provide in the external world under the condition of oxygen, make aerobic de-carbon microorganism of obligate and nitrifier carry out aerobic respiration, and be carbonic acid gas and water by metabolism with remaining organic pollutant oxygenolysis in the sewage, ammonia nitrogen is oxidized to nitrate nitrogen.
4, integrated pre-denitrification and denitrogenation biological filter sewerage treatment process as claimed in claim 1, water distribution system (2) in anoxic denitrification biological filter (5) and aerobic nitrification biological filter (9) is formed by filter plate and the strainer head that is installed on it with water distribution system (20), it is big that supporting layer (3) and supporting layer (21) are intensity, regular shape, the pebbles that does not participate in reacting is formed, spherical light porous biological ceramic particle layer (4) particle diameter is 4 ~ 9mm, spherical light porous biological ceramic particle layer (22) particle diameter is 1.5 ~ 5mm, and highly effective air diffuser system (17) is made up of steam line and single hole film air diffuser.
5, integrated pre-denitrification and denitrogenation biological filter sewerage treatment process as claimed in claim 1, it is characterized in that: in sewage water inlet pipe (25) and final outflow water canal (24), nitrate nitrogen, dissolved oxygen water-quality guideline on-line detector device (14) and (10) are installed, and will detect data and feed back to PLC computer workstation system (12), sequence of control by special exploitation comes automatic dynamic to adjust the rotating speed of reflux pump (18) and gas blower (15) by frequency transformer, and quantity of reflux and air demand that reflux pump (18) and gas blower (15) are supplied with satisfy operating requirement just.
6, integrated pre-denitrification and denitrogenation biological filter sewerage treatment process as claimed in claim 1, it is characterized in that: current all adopt the upward flow attitude in anoxic denitrification biological filter (5) and aerobic nitrification biological filter (9), the inner spherical light porous biological ceramic particle of loading (4), (22) density in water are the sinking fixed bed during operation greater than water.
7, integrated pre-denitrification and denitrogenation biological filter sewerage treatment process as claimed in claim 1 is characterized in that: the reflux ratio of aerobic nitrification biological filter (9) water outlet is come automatic dynamic adjustment reflux ratio according to desired nitric efficiency by the sequence of control of special exploitation according to the nitrate nitrogen on-line detector device of installing in sewage water inlet pipe (25) and the final outflow water canal (24) (14) and by PLC computer workstation system (12).
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| CN101774693A (en) * | 2010-03-31 | 2010-07-14 | 哈尔滨工业大学 | Method for quickly starting pre-denitrification biological aerated filter process |
| CN101844853A (en) * | 2010-03-31 | 2010-09-29 | 华南理工大学 | Method for biochemically removing total nitrogen from landfill leachate |
| CN102328996A (en) * | 2011-06-16 | 2012-01-25 | 北京城市排水集团有限责任公司 | Device and method for optimized control over carbon source feeding in denitrification biofilter process |
| CN101993833B (en) * | 2010-02-05 | 2012-05-09 | 哈尔滨工业大学 | Heterotrophic denitrifying bacterium for synchronously degrading sulfide, nitrate and organic carbon source |
| CN103121773A (en) * | 2012-12-31 | 2013-05-29 | 天津市工业微生物研究所 | Biological denitrification method of low-COD (chemical oxygen demand) high-ammonia-nitrogen municipal sewage with microbes |
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| CN101844853A (en) * | 2010-03-31 | 2010-09-29 | 华南理工大学 | Method for biochemically removing total nitrogen from landfill leachate |
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