CN101353200B - Method for reducing carbon dioxide discharge amount in seprobia dephosphorization denitrification process - Google Patents
Method for reducing carbon dioxide discharge amount in seprobia dephosphorization denitrification process Download PDFInfo
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- CN101353200B CN101353200B CN2008100427957A CN200810042795A CN101353200B CN 101353200 B CN101353200 B CN 101353200B CN 2008100427957 A CN2008100427957 A CN 2008100427957A CN 200810042795 A CN200810042795 A CN 200810042795A CN 101353200 B CN101353200 B CN 101353200B
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Abstract
The invention pertains to the technical field of environmental protection, and in particular relates to a method for reducing the discharge amount of carbon dioxide in the process of phosphorus and nitrogen removal of saprobe. Fermentation liquor produced by sewage sludge fermentation of sewage treatment factories is taken as supplementary carbon source of saprobe treatment system. The fermentation liquor is added in sewage, the sewage in which the fermentation liquor is supplemented is treated by biological treatment process, organic matter, nitrogen and phosphor are removed from the sewage,and the yielding water reaches the mark and is discharged. On the premise that the effect of phosphorus and nitrogen removal of saprobe is maintained, the method of the invention achieves the purposethat CO2 produced in the process for treating saprobe is reduced markedly. The method not only utilizes waste by reclamation and saves the limited organic resource of human being, but also reduces discharge amount of CO2 in the process for treating saprobe. Under the operation of reasonable process parameter, compared with that acetic acid or dextrose is adopted to be supplementary carbon source of the process of phosphorus and nitrogen removal, the fermentation liquor which is taken as supplementary carbon source of the process of phosphorus and nitrogen removal can reduce the discharge amount of CO2 by about 20%.
Description
Technical field
The invention belongs to environmental protection technical field; be specifically related to a kind of liquid (abbreviation fermented liquid) replacement acetate that produces by fermenting or glucose supplementary carbon source, thereby reduce carbonic acid gas (CO in the saprobia dephosphorization denitrification process as the saprobia dephosphorization and denitrification process with sewage plant sludge
2) method of quantity discharged.
Background technology
Contain a large amount of organism, nitrogen and phosphorus in the sewage, directly discharge, so could discharge after needing processing up to standard contaminate environment.Biological treatment is the most frequently used sewage water treatment method, and this method generally comprises aerobic processes, and organism is oxidized to CO in this process
2And be discharged in the atmosphere.
At China's southern area, because organic concentration is lower in the sewage, in order to control body eutrophication, cut down nitrogen, phosphorus in the sewage, usually need be in additional a certain amount of carbon source, as acetate, glucose, to reach the purpose (WaterResearch of denitrogenation dephosphorizing, 2007,41 (3), 683-689).After the carbon sources such as additional acetate,, but also increased simultaneously CO although nitrogen in the Sewage treatment systems water outlet and phosphorus have satisfied national emission standard
2Quantity discharged.In recent years, this seminar studies show that, fermented liquid carbon source as a supplement also can improve the denitrogenation dephosphorizing effect of sewage, makes effluent quality reach discharging standards.
CO
2Isothermal chamber gas is one of key factor that causes climate warming.As everyone knows, because Economic development is flourishing, therefore energy-output ratio increases severely, and China has surpassed the U.S. now, becomes CO in the world
2Discharge maximum countries.Therefore China face huge pressure in the world.
It is estimated the CO that China discharges because of biological sewage treatment every year
2Be 10,412,000 ton of (water supply and drainage, 2007,33 (5), 11-12; Http:// www.lrn.cn/stratage/expertpoint/200711/t20071126_171371. htm).Although sewage disposal is CO
2An important source, yet currently also do not reduce CO at sewage work
2The concrete measure of quantity discharged and technology.
Summary of the invention
The object of the present invention is to provide a kind of method that reduces CO2 emissions in the saprobia dephosphorization denitrification process.
The method of CO2 emissions in the minimizing saprobia dephosphorization denitrification process that the present invention proposes, concrete steps are as follows: the fermented liquid that produces with sludge of sewage treatment plant fermentation is as the supplementary carbon source of sewage biological treatment system, described fermented liquid is added in the sewage, sewage after the afterfermentation liquid enters biological treatment and handles, remove organism, nitrogen and phosphorus in the sewage, the water outlet qualified discharge; The fermented liquid COD concentration that adds in the sewage is 50-500mg/L.
Document (Environmental Science﹠amp is seen in the source of fermented liquid described in the present invention; Technology, 2006,40 (6), 2025-2029), this fermented liquid COD concentration is about 8000mg/L.
The present invention is directed to supplementary carbon source (being generally acetate, glucose) afterwards, CO in the biologic process for treating sewage
2The problem that quantity discharged significantly rises, the present invention studies show that, supplementary carbon source is replaced with fermented liquid, can significantly reduce CO
2Quantity discharged.
Among the present invention, described biological treatment specifically can be: SBR technology, A/O technology, A
2/ O technology, inversion A
2/ O technology, in oxidation ditch process or the Unitank technology any.
The present invention's implementation condition preferably is:
Among the present invention, after the afterfermentation liquid, the concentration of fermented liquid is in the sewage: 50-200mg/L (in COD).
The saprobia dephosphorization denitrogenation generally all comprises aerobic processes, produces a large amount of carbonic acid gas (CO thereby organism is oxidized in this process
2).Present method is that the liquid (abbreviation fermented liquid) that utilizes sludge of sewage treatment plant fermentation to produce replaces acetate or the glucose supplementary carbon source as the biological carbon and phosphorous removal treatment process, under the prerequisite that keeps the saprobia dephosphorization and denitrification effect, reach remarkable reduction biological wastewater treatment process and produce CO
2Purpose.Present method is the recycling refuse not only, saves human limited organic resource, has reduced CO in the biological wastewater treatment process simultaneously
2Quantity discharged.Under the reasonable technological parameter operation, compare as the denitrification dephosphorization technique supplementary carbon source with utilizing acetate or glucose, use fermented liquid can make CO as the denitrification dephosphorization technique supplementary carbon source
2Quantity discharged reduces about 20%.
The invention has the beneficial effects as follows:
(1) causes CO at supplementary carbon source in the biological wastewater treatment process
2The problem that quantity discharged increases has proposed a kind of minimizing greenhouse gases CO
2The method of quantity discharged.
(2) mud that produces from Sewage Plant of the additional carbon that uses among the present invention, not only recycling refuse, saved consumption to chemical agents such as acetate, reduced the discharging of greenhouse gases simultaneously.
(3) method among use the present invention does not need to roll up capital construction and facility investment, can reach and reduce CO
2Quantity discharged; This has certain directive significance to Sewage Plant energy-saving and emission-reduction, reduction running cost and reduction greenhouse gas emissions.
Embodiment
Be described in further detail below in conjunction with example: below being to be understood that for embodiment just for the present invention that explains, do not comprise all the elements of the present invention.
Embodiment 1:
Actual cities sewage influent quality is: COD is 180mg/L, and TN is 29.6mg/L, NH
4 +-N is 28.3mg/L, and TP is 6.23mg/L.Do not replenish additional carbon in this sewage and directly enter the sbr reactor device and handle.SBR one-period 8h, operation scheme is followed successively by: anaerobism 1.5h, aerobic 1h, anoxic 1h, aerobic 30min, anoxic 1h, aerobic 20min, precipitation 1h, draining 5min, idle 2h; Sludge age is 15d, and the water-filling ratio is 0.75.Effluent quality behind the operation one-period: COD is 21mg/L, and TN is 19.5mg/L, NH
4 +-N is 0mg/L, and TP is 2.12mg/L.Effluent quality does not meet country-level A emission standard.
Use same technology, handle before the setting but sewage enters, replenishing acetate and make COD of sewage in above-mentioned municipal effluent is 230mg/L.The effluent quality of SBR is: COD is 21mg/L, and TN is 16.2mg/L, NH
4 +-N is 0mg/L, and TP is 1.43mg/L.Effluent quality does not still reach country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 141.5g.
Embodiment 2:
Municipal effluent water quality and treatment process are with embodiment 1.Before sewage enters and handle to be provided with, afterfermentation liquid and to make COD of sewage be 230mg/L in municipal effluent.The effluent quality of SBR is: COD is 23mg/L, and TN is 14.6mg/L, NH
4 +-N is 0mg/L, and TP is 0.95mg/L.Effluent quality reaches country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 125.6g, reduce discharging CO than the acetate that replenishes with the COD amount
2About 11%.
Embodiment 3:
Municipal effluent water quality and treatment process are with embodiment 1.Sewage enters to be handled before the setting, and replenishing acetate and make COD of sewage in municipal effluent is 280mg/L.The effluent quality of SBR is: COD is 29mg/L, and TN is 13.8mg/L, NH
4 +-N is 0mg/L, and TP is 0.92mg/L.Effluent quality reaches country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 179.7g.
Embodiment 4:
Municipal effluent water quality and treatment process are with embodiment 1.Before sewage enters and handle to be provided with, afterfermentation liquid and to make COD of sewage be 280mg/L in municipal effluent.The effluent quality of SBR is: COD is 31mg/L, and TN is 6.7mg/L, NH
4 +-N is 0mg/L, and TP is 0.38mg/L.Effluent quality reaches country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 148.2g, reduce discharging CO than the acetate that replenishes with amount
2About 18%.
Embodiment 5:
Municipal effluent water quality and treatment process are with embodiment 1.Sewage enters to be handled before the setting, and replenishing acetate and make COD of sewage in municipal effluent is 380mg/L.The effluent quality of SBR is: COD is 29mg/L, and TN is 10.7mg/L, NH
4 +-N is 0mg/L, and TP is 0.89mg/L.Effluent quality reaches country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 264.4g.
Embodiment 6:
Municipal effluent water quality and treatment process are with embodiment 1.Before sewage enters and handle to be provided with, afterfermentation liquid and to make COD of sewage be 380mg/L in municipal effluent.The effluent quality of SBR is: COD is 31mg/L, and TN is 6.7mg/L, NH
4 +-N is 0mg/L, and TP is 0.38mg/L.Effluent quality reaches country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 207.4g, reduce discharging CO than the acetate that replenishes with amount
2About 22%.
Embodiment 7:
Municipal effluent water quality and treatment process are with embodiment 1.Sewage enters to be handled before the setting, and replenishing acetate and make COD of sewage in municipal effluent is 680mg/L.The effluent quality of SBR is: COD is 130mg/L, and TN is 12mg/L, NH
4 +-N is 10mg/L, and TP is 4.3mg/L.Effluent quality does not reach country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 419.8g.
Embodiment 8:
Municipal effluent water quality and treatment process are with embodiment 1.Before sewage enters and handle to be provided with, afterfermentation liquid and to make COD of sewage be 680mg/L in municipal effluent.The effluent quality of SBR is: COD is 142mg/L, and TN is 13mg/L, NH
4 +-N is 11.5mg/L, and TP is 4.5mg/L.Effluent quality does not reach country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 312.3g, reduce discharging CO than the acetate that replenishes with amount
2About 26%.
Embodiment 9:
Municipal effluent water quality is with embodiment 1.Adopt A
2/ O art breading, anaerobic zone volume: oxygen-starved area volume: the aerobic zone volume is 1:1.5:2.5, and the sewage internal reflux ratio is 150%, and return sludge ratio is 100%, and hydraulic detention time is 12h, sludge age is 14d.A
2The effluent quality of/O is: COD is 26mg/L, and TN is 16.1mg/L, NH
4 +-N is 1.0mg/L, and TP is 3.2mg/L.Effluent quality does not meet country-level A emission standard.
Use same technology, handle before the setting but sewage enters, replenishing acetate and make COD of sewage in municipal effluent is 300mg/L.A
2The effluent quality of/O is: COD is 22mg/L, and TN is 11.1mg/L, NH
4 +-N is 1.6mg/L, and TP is 0.9mg/L.Effluent quality reaches country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 176.8g.
Embodiment 10:
Municipal effluent water quality and treatment process are with embodiment 9.Sewage enter handle to be provided with before, afterfermentation liquid and to make COD of sewage be 300mg/L in municipal effluent.A
2The effluent quality of/O technology is: COD is 22mg/L, and TN is 7.9mg/L, NH
4 +-N is 1.2mg/L, and TP is 0.8mg/L.Effluent quality reaches country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 142.3g, reduce discharging CO than the acetate that replenishes with amount
2About 20%.
Embodiment 11:
Municipal effluent water quality is with embodiment 1.Adopt inversion A
2/ O art breading, oxygen-starved area volume: anaerobic zone volume: the aerobic zone volume is 1:1:2.5, and return sludge ratio is 120%, and hydraulic detention time is 13.6h, and sludge age is 13d.Inversion A
2The effluent quality of/O is: COD is 28mg/L, and TN is 14.3mg/L, NH
4 +-N is 1.0mg/L, and TP is 2.4mg/L.Effluent quality does not meet country-level A emission standard.
Use same technology, but before sewage entered the processing setting, replenishing glucose and make and make COD of sewage in municipal effluent was 330mg/L.Inversion A
2The effluent quality of/O technology is: COD is 22mg/L, and TN is 11.1mg/L, NH
4 +-N is 1.6mg/L, and TP is 0.9mg/L.Effluent quality reaches country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 220.0g.
Embodiment 12:
Municipal effluent water quality and treatment process are with embodiment 11.Sewage enter handle to be provided with before, afterfermentation liquid and to make COD of sewage be 330mg/L in municipal effluent.Inversion A
2The effluent quality of/O technology is: COD is 22mg/L, and TN is 8.9mg/L, NH
4 +-N is 1.2mg/L, and TP is 0.8mg/L.Effluent quality reaches country-level A emission standard.Handle the CO that every cubic metre of sewage discharges
2Be 178.4g, reduce discharging CO than the glucose that replenishes with amount
2About 19%.
Above-mentioned description to embodiment is can understand and apply the invention for the ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (3)
1. method that reduces CO2 emissions in the saprobia dephosphorization denitrification process, it is characterized in that concrete steps are as follows: the fermented liquid that produces with sludge of sewage treatment plant fermentation is as the supplementary carbon source of sewage biological treatment system, described fermented liquid is added in the sewage, sewage after the afterfermentation liquid enters biological treatment and handles, remove organism, nitrogen and phosphorus in the sewage, the water outlet qualified discharge; The fermented liquid COD concentration that adds in the sewage is 50-500mg/L.
2. the method for CO2 emissions is characterized in that described biological treatment is a SBR technology, A/O technology, A in the minimizing saprobia dephosphorization denitrification process according to claim 1
2/ O technology, inversion A
2/ O technology, in oxidation ditch process or the Unitank technology any.
3. the method for CO2 emissions is characterized in that after the afterfermentation liquid that the concentration of fermented liquid COD is 50-200mg/L in the sewage in the minimizing saprobia dephosphorization denitrification process according to claim 1.
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