CN103739169A - Nitrogen and phosphorus removal method for biological sewage treatment - Google Patents
Nitrogen and phosphorus removal method for biological sewage treatment Download PDFInfo
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Abstract
The invention discloses a nitrogen and phosphorus removal method for biological sewage treatment, which is designed aiming at a traditional sewage treatment that a chemical agent needs to be added, the nitrogen and phosphorus removal efficiency is low and the operation cost is high. According to the nitrogen and phosphorus removal method for the biological sewage treatment, a biological tank comprises a pre-anoxic zone, an anaerobic zone, an anoxic zone, an aerobic zone and a facultative zone; the pre-anoxic zone and the facultative zone are increased so that water can be input from a plurality of points; the water conservation staying time of each zone is adjusted and an inner reflowing manner is changed; efficient phosphorus removal strains are used for carrying out nitrogen and phosphorus removal of sewage. According to the nitrogen and phosphorus removal method for the biological sewage treatment, the chemical phosphorus removal medicine does not need to be added so that the operation cost is low and the nitrogen and phosphorus removal efficiency is high; the removing rate of nitrogen and phosphorus in an urban sewage treatment process is improved to 90% so that the sludge reduction ratio reaches 10%.
Description
Technical field
The present invention relates to environmental engineering and sewage treatment area, relate in particular to a kind of biological sewage treatment denitrification and dephosphorization method.
Background technology
The content of body eutrophication and nitrogen, phosphorus and nitrogen and phosphorus content ratio are closely related, administer body eutrophication, first must control the nitrogen, the phosphorus amount that enter water body.In recent years, the a lot of urban wastewater treatment firms of China have been carried out and have been proposed mark transformation, carry out < < urban wastewater treatment firm pollutant emission standard > > (GB18918-2002) one-level A standard, for slowing down body eutrophication, play an important role.
Urban wastewater treatment firm, for realizing denitrogenation dephosphorizing function, adopts oxidation ditch, CASS, A mostly
2/ O and deformation technique thereof, above-mentioned technique is limited to the competition of microorganism to carbon source and the difference of required envrionment conditions in denitrogenation dephosphorizing process, and denitrogenation and dephosphorization ability are difficult to Synchronous lifting.For this reason, the most of mode that adopts the biochemical workshop section of urban wastewater treatment firm of above-mentioned technique to adopt guarantor's nitrogen to abandon phosphorus of China, also needs to add a large amount of carbon sources for the low sewage of C/N, thereby has increased running cost; And for the removal of phosphorus, generally adopt the mode of " biological phosphate-eliminating+chemical dephosphorization ", be more can make its water outlet reach relevant criterion by coagulation, precipitation, filtration even depth treatment process.Chemical dephosphorization is to rely on the medicament such as polymerize aluminum chloride, poly-ferric chloride class adding, and forms insoluble calcium phosphate precipitation, and total phosphorus is removed.But adding of chemical agent, has not only increased the running cost of urban wastewater treatment firm, and produce a large amount of chemical sludges, can further increase sludge treatment cost.
Denitrifying phosphorus removing bacteria be a class take nitrate nitrogen as electron acceptor(EA), there is under anoxia condition the bacterial classification of excessive dephosphorization under denitrification denitrogenation and aerobic conditions, since such bacterium is found, received much concern, become one of study hotspot of sewage treatment area.But because this bacterial classification is subject to the impact of the factors such as organism in sewage, nitrate, sludge concentration, the anaerobism residence time, dissolved oxygen, nitrite; in testing laboratory, can cultivate this bacterial classification; little real die trial has obtained good effect in intending; as double sludge denitrification dephosphorization; but because complex process, cost of investment are high; the reasons such as operation complexity can not applied in mass-producing engineering.In existing sewage treatment project, be difficult to large scale culturing denitrifying phosphorus removing bacteria, only add chemical dephosphorization medicament and just can make water outlet reach emission standard.
Summary of the invention
For the problems referred to above, the invention provides a kind of without adding chemical dephosphorization medicament, denitrogenation dephosphorizing efficiency is high, running cost is low biological sewage treatment denitrification and dephosphorization method.
For achieving the above object, biological sewage treatment denitrification and dephosphorization method of the present invention, raw waste water enters biological tank successively and second pond is processed, described biological tank comprises pre-anoxic section, anaerobism section, anoxic section, aerobic section and double oxygen section, at raw waste water, enter in the process that described biological tank and described second pond process, constantly have raw waste water to supplement, raw waste water total amount is remained unchanged, concrete grammar is as follows:
After 35% raw waste water of raw waste water total amount is mixed with from the returned sluge of second pond, entering pre-anoxic section processes, hydraulic detention time is 1 hour, in pre-anoxic section, remove the dissolved organic matter in nitrate and the water inlet in returned sluge by denitrification, through pre-anoxic section, water outlet after treatment enters into anaerobism section;
After 35% raw waste water of the water outlet of pre-anoxic section and raw waste water total amount is mixed, entering anaerobism section processes, hydraulic detention time is 2 hours, in anaerobism section, by polyP bacteria and denitrifying phosphorus removing bacteria, release phosphorus, through anaerobism section, water outlet after treatment enters into anoxic section;
After the water outlet of anaerobism section is mixed with from the phegma of aerobic section, entering anoxic section processes, the quantity of reflux of described phegma is 1.5 times of raw waste water total amount, hydraulic detention time is 3 hours, in anoxic section, by denitrifying bacteria, carry out denitrogenation, by denitrifying phosphorus removing bacteria, carry out synchronous dephosphorization, through anoxic section, water outlet after treatment enters into aerobic section;
After 20% raw waste water of the water outlet of anoxic section and raw waste water total amount is mixed, entering aerobic section processes, hydraulic detention time is 5 hours, at aerobic section, by the effect of aerobic bacteria, decompose the organism in sewage, mineralized nitrogen is become to nitrate, and Phosphate Sorption hydrochlorate, through aerobic section water outlet after treatment, wherein there is the water outlet of 1.5 times of raw waste water total amounts to be back to anoxic section as phegma, remaining water outlet enters into the oxygen section of holding concurrently;
After 10% raw waste water of aerobic section water outlet and raw waste water total amount is mixed by pulling flow type, entering the oxygen section of holding concurrently processes, hydraulic detention time is 1.5 hours, in double oxygen section by the effect of denitrifying bacteria, and utilize the organic matter removal nitrate in former water, through holding concurrently, the water outlet after treatment of oxygen section enters into second pond;
The water outlet of the oxygen section of holding concurrently is entered into second pond and carry out precipitate and separate processing, wherein through the water outlet precipitating and isolating, enter back segment disinfecting steps, through the sludge reflux precipitating and isolating, arrive pre-anoxic section, the quantity of reflux of returned sluge is 50% to 100%, and excess sludge drains into sludge treating system outward.
Particularly, at the water outlet dissolved oxygen concentration of the oxygen section of holding concurrently, be 0.5mg/L to 2mg/L.
Particularly, in anaerobism section sludge concentration, be 9000mg/L to 12000mg/L.
Biological sewage treatment denitrification and dephosphorization method of the present invention, at traditional A
2in/O technique, increase pre-anoxic section and double oxygen section, by multipoint water feeding, adjusted the water conservancy residence time of each period, changed internal reflux mode, adopted efficient dephosphorization bacterial classification to carry out the biological carbon and phosphorous removal of sewage.Compared with traditional waste water treatment process, the present invention is without adding chemical dephosphorization medicament, and running cost is low, and denitrogenation dephosphorizing efficiency is high.The present invention can make the clearance of nitrogen and phosphorus in municipal sewage treatment process bring up to 90%, makes mud decrement ratio reach 10%.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of biological sewage treatment denitrification and dephosphorization method of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention will be further described.
Be illustrated in figure 1 the process flow sheet of biological sewage treatment denitrification and dephosphorization method, raw waste water enters biological tank successively and second pond is processed, described biological tank comprises pre-anoxic section, anaerobism section, anoxic section, aerobic section and double oxygen section, at raw waste water, enter in the process that described biological tank and described second pond process, constantly there is raw waste water to supplement, raw waste water total amount is remained unchanged, and sewage disposal detailed process is as follows:
1, first will be through grid, after 35% raw waste water (this value can be adjusted according to influent concentration) of the pretreated raw waste water total amount such as sand setting fully mixes with the returned sluge from second pond, entering pre-anoxic section processes, hydraulic detention time in pre-anoxic section is about 1 hour, in the nitrate of returned sluge the inside and water inlet, dissolved organic matter is removed under denitrification, thereby the contained nitrate impact on anaerobic phosphorus release in minimizing returned sluge, from the sludge concentration of the returned sluge of second pond, be wherein 8000mg/L, in order to organic quick adsorption, through pre-anoxic section, water outlet after treatment enters into anaerobism section
2, entering anaerobism section after 35% raw waste water of the water outlet of pre-anoxic section and raw waste water total amount is fully mixed processes, at the hydraulic detention time of anaerobism section, be about 2 hours, under the effect of anaerobism section polyP bacteria and denitrifying phosphorus removing bacteria, fully release phosphorus, in anaerobism section sludge concentration, can reach between 9000mg/L to 12000mg/L, through anaerobism section, water outlet after treatment enters into anoxic section.
3, entering anoxic section after the water outlet of anaerobism section is fully mixed with the phegma from aerobic section processes, the quantity of reflux of described phegma is 1.5 times of raw waste water total amount, at the hydraulic detention time of anoxic section, be about 3 hours, in anoxic section, by denitrifying bacteria, carry out denitrogenation, denitrifying phosphorus removing bacteria utilizes nitrate to carry out Phosphate Sorption hydrochlorate, realize synchronous denitrification dephosphorizing, through anoxic section, water outlet after treatment enters into aerobic section.
4, after 20% raw waste water of the water outlet of anoxic section and raw waste water total amount is fully mixed, entering aerobic section processes, at the hydraulic detention time of aerobic section, be about 5 hours, at aerobic section, by the effect of aerobic bacteria, decompose the organism in sewage, ammonia nitrogen is converted to nitrate and the remaining phosphoric acid salt of absorption, control aerobic section water outlet dissolved oxygen concentration in 2mg/L left and right, for nitrifier provides environment, by mineralized nitrogen, it is nitric nitrogen, thereby for anoxic section denitrifying phosphorus removing bacteria provides nitrate, through aerobic section water outlet after treatment, wherein there is the water outlet of 1.5 times of raw waste water total amounts to be back to anoxic section as phegma, remaining water outlet enters into the oxygen section of holding concurrently.
5, entering the oxygen section of holding concurrently after 10% raw waste water of aerobic section water outlet and raw waste water total amount is fully mixed by pulling flow type processes, hydraulic detention time in the oxygen section of holding concurrently is about 1.5 hours, in double oxygen section, utilize the organism in raw waste water to remove remaining nitrate as denitrifying carbon source, increase nitric efficiency, and control and hold concurrently oxygen section water outlet dissolved oxygen concentration between 0.5mg/L to 2mg/L, when in the water outlet of the oxygen section of holding concurrently, ammonia nitrogen or organic concentration are too high, need to carry out oxygenation at intermittence, through holding concurrently, the water outlet after treatment of oxygen section enters into second pond.
6, the water outlet of the oxygen section of holding concurrently is entered to second pond and carry out precipitate and separate processing, wherein through the water outlet precipitating and isolating, enter back segment disinfecting steps, through the sludge reflux precipitating and isolating, arrive pre-anoxic section, the quantity of reflux of returned sluge is 50% to 100%, and excess sludge drains into sludge treating system outward.
Compared with traditional biological tank, the present invention is optimized biological tank, and biological tank used has increased pre-anoxic section and double oxygen section, and wherein pre-anoxic section is mainly to remove returned sluge the inside redundant nitric acid salt, increases the effect of anaerobic phosphorus release; The oxygen section of holding concurrently is carried out technique adjustment according to influent density, realizes anoxic denitrification denitrogenation in the situation that concentration is low, and in the situation that concentration is high, aeration is removed unnecessary organism and ammonia nitrogen, and increases internal reflux raising denitrification effect.
The mode that the present invention adopts multipoint water feeding and proportion expression to distribute, makes the adaptability of technique and handiness stronger.To pre-anoxic section, anaerobism section, aerobic section and double oxygen section pro-rata water inlet, by the changes allocation proportion of intake, the sludge concentration of pre-anoxic section to be adjusted, raising mud adsorbs organic ability in sewage in anaerobism section.
In the present invention, aerobic section contains very high nitrate nitrogen, and nitrification liquid is back to anoxic pond, by multipoint water feeding mode, has reduced the organic content of anoxic section simultaneously, impels denitrifying bacteria and denitrifying phosphorus removing bacteria raised growth, synchronously carries out denitrogenation dephosphorizing.Clearance at anoxic section phosphorus reaches more than 70%, has reduced aerobic suction phosphorus requisite oxygen amount, has also reduced aerobic suction phosphorus load, has improved the clearance of phosphorus.
The technique of biological sewage treatment denitrogenation dephosphorizing of the present invention, in the situation that not adding chemical dephosphorization medicament, only rely on biological phosphate-eliminating effect, cultivate efficient dephosphorization bacterial classification, create the microenvironment that is applicable to denitrifying phosphorus removing bacteria growth and breeding, by sewage disposal, moving to adjust coordinates denitrogenation dephosphorizing mutually, obtain the maximization of nitrogen phosphorus biological removal efficiency, in sewage treatment process, the clearance of nitrogen and phosphorus brings up to 90%, make final outflow water can reach the A standard of one-level in < < urban wastewater treatment firm pollutant emission standard > > (GB18918-2002) completely, water outlet total phosphorus is stabilized in 0.2-0.3mg/L, make mud decrement reach more than 10% simultaneously.
Below take certain municipal sewage plant as example, it in table 1, is the actual operating data of this factory, after adopting biological sewage treatment denitrification and dephosphorization method of the present invention to process, the clearance of total phosphorus and total nitrogen is compared other similar sewage works and is brought up to respectively more than 95% and more than 80%, do not adding in chemical agent situation, water outlet reaches the A standard of one-level in < < urban wastewater treatment firm pollutant emission standard > > (GB18918-2002) completely.
Table 1 running condition table
Above; be only preferred embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.
Claims (3)
1. a biological sewage treatment denitrification and dephosphorization method, it is characterized in that, raw waste water enters biological tank successively and second pond is processed, described biological tank comprises pre-anoxic section, anaerobism section, anoxic section, aerobic section and double oxygen section, at raw waste water, enter in the process that described biological tank and described second pond process, constantly have raw waste water to supplement, raw waste water total amount is remained unchanged, concrete grammar is as follows:
After 35% raw waste water of raw waste water total amount is mixed with from the returned sluge of second pond, entering pre-anoxic section processes, hydraulic detention time is 1 hour, in pre-anoxic section, remove the dissolved organic matter in nitrate and the water inlet in returned sluge by denitrification, through pre-anoxic section, water outlet after treatment enters into anaerobism section;
After 35% raw waste water of the water outlet of pre-anoxic section and raw waste water total amount is mixed, entering anaerobism section processes, hydraulic detention time is 2 hours, in anaerobism section, by polyP bacteria and denitrifying phosphorus removing bacteria, release phosphorus, through anaerobism section, water outlet after treatment enters into anoxic section;
After the water outlet of anaerobism section is mixed with from the phegma of aerobic section, entering anoxic section processes, the quantity of reflux of described phegma is 1.5 times of raw waste water total amount, hydraulic detention time is 3 hours, in anoxic section, by denitrifying bacteria, carry out denitrogenation, by denitrifying phosphorus removing bacteria, carry out synchronous dephosphorization, through anoxic section, water outlet after treatment enters into aerobic section;
After 20% raw waste water of the water outlet of anoxic section and raw waste water total amount is mixed, entering aerobic section processes, hydraulic detention time is 5 hours, at aerobic section, by the effect of aerobic bacteria, decompose the organism in sewage, mineralized nitrogen is become to nitrate, and Phosphate Sorption hydrochlorate, through aerobic section water outlet after treatment, wherein there is the water outlet of 1.5 times of raw waste water total amounts to be back to anoxic section as phegma, remaining water outlet enters into the oxygen section of holding concurrently;
After 10% raw waste water of aerobic section water outlet and raw waste water total amount is mixed by pulling flow type, entering the oxygen section of holding concurrently processes, hydraulic detention time is 1.5 hours, in double oxygen section by the effect of denitrifying bacteria, and utilize the organic matter removal nitrate in former water, through holding concurrently, the water outlet after treatment of oxygen section enters into second pond;
The water outlet of the oxygen section of holding concurrently is entered into second pond and carry out precipitate and separate processing, wherein through the water outlet precipitating and isolating, enter back segment disinfecting steps, through the sludge reflux precipitating and isolating, arrive pre-anoxic section, the quantity of reflux of returned sluge is 50% to 100%, and excess sludge drains into sludge treating system outward.
2. biological sewage treatment denitrification and dephosphorization method according to claim 1, is characterized in that, at the water outlet dissolved oxygen concentration of the oxygen section of holding concurrently, is 0.5mg/L to 2mg/L.
3. biological sewage treatment denitrification and dephosphorization method according to claim 1, is characterized in that, in anaerobism section sludge concentration, is 9000mg/L to 12000mg/L.
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| CN112062288B (en) * | 2020-04-23 | 2024-03-05 | 冯晓明 | Multistage circulation vertical partition sewage denitrification and dephosphorization treatment process and treatment device thereof |
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