CN103011493B - Method for removing phosphate and nitrogen from hyperphosphate and high ammonia nitrogen sewage and recovering resources - Google Patents
Method for removing phosphate and nitrogen from hyperphosphate and high ammonia nitrogen sewage and recovering resources Download PDFInfo
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Abstract
The invention discloses a method for removing phosphate and nitrogen from hyperphosphate and high ammonia nitrogen sewage and recovering resources. A polyphosphate accumulating bacteria artificial biological membrane is taken as a core technology to carry out bio-denitrification phosphate and nitrogen removal and is combined with ammonium magnesium phosphate to remove phosphate and ammonia. The method comprises the steps that: A, pig raising sewage biogass slurry is filled into a conditioning tank through a collecting tank and is aerated, mixed and then precipitated to recover the ammonium magnesium phosphate; B, a first-level tank which is fixed with a bacillus and nitrobacteria artificial biological membrane is used; C, a second-level tank which is fixed with a bacillus and photosynthetic bacteria like polyphosphate accumulating bacteria artificial biological membrane is used; D, a third-level tank uses an artificial biological membrane which is prepared from photosynthetic bacteria to treat, wherein the first-level, the second-level and the third-level tanks all adopt artificial biological membrane floating suspension type device and intermittent aeration to create anaerobic/aerobic or anoxic environments and carry out denitrifying phosphate and nitrogen removal; and E, oxidation pond: water reaches the quality standard and is recycled. The method is practicable, has a good treatment effect, is energy-saving, is low in operation cost and is convenient to operate; and a method for treating pig raising sewage with high phosphate and ammonia nitrogen concentrations and other similar organic sewages is provided.
Description
Technical field
The invention belongs to technical field of sewage, more specifically relate to a kind of method of high phosphorus, high-ammonia-nitrogen sewage dephosphorization denitrogenation, resource recovery, it is applicable to the raise pigs phosphorus in sewage and other waste water, removal and the resource recycling of ammonia nitrogen.
Background technology
The sewage of raising pigs belongs to high phosphorus, high ammonia nitrogen, high COD, unmanageable sewage:
Pig farm sewage comprises ight soil, urine, the remaining feed etc. of pig, so that ammonia nitrogen, phosphorus, COD
crall very high with the content of suspended solid.Even the natural pond liquid of discharging after biogas fermentation is processed, the concentration of ammonia nitrogen wherein still can reach 600mg/L left and right, and phosphorus content is also higher than 50mg/L, very large to environmental influence, belonging to the great high concentrated organic wastewater of intractability, is also to cause one of main source of pollution of body eutrophication.(Ma Yantao Xue Jin phoenix, 2009. raise pigs wastewater processing technology progress." environment and continuative development ", 5:29-32. Meng Xiang sea, Wang Yubo, Zhou Haichuan, the investigation of outskirts of a town large scale of pig farm the Study on Sustainable Development under 2011. recycling economy visual angles-based on 29 of Wuhan City large-scale pig farm and periphery peasant household." hubei agricultural science ", 50(2): 334-339).
China's sewage disposal present situation of raising pigs:
China is the big country of raising pigs, and the quantity of raising pigs accounts for global half; Ten thousand pig farm is produced fecaluria per year and is exceeded 20,000 tons, and feces of livestock and poultry amount in 2010 has reached 4,500,000,000 tons according to statistics.Handle the sewage of raising pigs well all significant to the Sustainable development of protection of the environment and pig industry.
The method that current domestic most large scale of pig farm field fecaluria is processed generally application is the supporting ecological agriculture cultivation schemes such as multi stage precipitation-oxidation scheme and fruit-bearing forest, fish pond, arable land.Wherein 3 kinds of representative main modes are: solid-liquid separation+methane-generating pit (or anaerobic pond)+aerobic aeration pond+oxidation pond (or fish pond); Methane-generating pit (or anaerobic pond)+facultative lagoon+oxidation pond (or fish pond); Directly enter fish pond, gush in river, or is directly used in fruit tree woods.(Jiang Xin, 2011. large scale of pig farm field, Guangzhou contaminated wastewater investigation are inquired into Preventing Countermeasures." environmental research and monitoring ", 1:69-72.).
There is other pig farm to introduce the advanced pig breeding instrument of a complete set of import, adopt conventional sewage treatment facility, but still severe overweight of water quality; Advanced liquid dung automatic separation equipment is introduced on some pig farms both at home and abroad, recycle after argol direct production granular fertilizer, sewage purification, but facility investment and operation cost are too high, are difficult to apply.In addition, " processing of methane-generating pit-biofilm reactor-artificial swamp raise pigs waste water system " that also has University Of Nanchang (CN101863583A) and " sequencing batch biofilm reactor of piggery wastewater " (CN101863556A), and " the improvement method of digested piggery wastewater " of Chengdu Inst. of Biology, Chinese Academy of Sciences (CN101531436A) etc. is different from patent application of the present invention.The pig farm in district there is no environmental practice more, and the phenomenon that pig manure, urine directly enter surrounding enviroment is very general, and environment is caused to sizable harm.
Biological denitrification denitrogenation dephosphorizing:
Biological denitrification denitrogenation dephosphorizing is the research topic receiving much concern, Liu Xin is at " research of external Denitrifying Phosphate Accumulating Organisms dephosphorization influence factor " (Shanxi architecture, 2010, 36(18): 178-179), Jiang Ming etc. are at ". biological denitrification dephosphorization technique progress " (" water purification technology ", 2011, 30(6): 11-15.), Zhao Linlin, ". Wastewater Denitrifying Phosphorus Removal Technology progress " (" chemical industry environmental protection " that Wang Haiyan etc. deliver, 2011, 31(1): 38-41), recent domestic biological denitrification dephosphorization technique progress of research and research level are introduced respectively, from rational approach, technique and the factor that affects denitrification dephosphorization has been done to analysis.
The process of biological denitrification denitrogenation dephosphorizing mainly realizes by Denitrifying Phosphate Accumulating Organisms.The introduction of Gao Yanling, motor comparison system in chapter 2 " the research application of polyP bacteria " (2006.26-34 page, Chinese building material industry press) of " biological sewage treatment new technology " book polyP bacteria research and application feature.Existing a large amount of polyP bacteria is separated and confirm, its common trait is under the condition of aerobic or anoxic, the orthophosphoric acid salt of bacterial cell huge uptake solubilised state from sewage, synthetic polyphosphoric acid salt in cell, the phosphorus amount of accumulation can reach the 6-8% of cell weight, and even 31%, and ordinary cells phosphorus content is only 1-3%, substantially exceeds the phosphorus amount of normal need; On the other hand, under anaerobic, polyphosphoric acid salt in polyP bacteria decomposer, produce ATP, the lower fatty acids such as the acetic acid in absorption sewage, synthetic poly-β hydroxy fatty acid esters polymer (PHAs) in cell, wherein, taking poly-β-hydroxy butyrate (PHB) as representative, discharge PO
4 -3in environment; Facultative denitrifying bacterium also has very strong biological phosphate-eliminating effect, they replace oxygen as electron acceptor(EA) using nitric nitrogen, denitrification denitrogenation and two processes of biological phosphate-eliminating are united two into one, and the biochemical metabolism model of polyP bacteria dephosphorization has been proposed, this model has proposed can form polyphosphoric acid salt (Poly-P+PHB) composite particle precursor outside bacterial cell.
Chemical dephosphorization and ammonia nitrogen:
Application ammonium magnesium phosphate (MAP) precipitator method are removed phosphorus and ammonia nitrogen.Trimagnesium phosphate, by being white or yellow, brown, the grey crystal that is insoluble in water, is commonly called as struvite, is a kind of slow release fertilizer, is 1:1:1 containing the ratio of Mg, N, P, and pH value is the key that forms this compound manure.Its reaction formula is:
As fertilizer sources be taken out and be reclaimed to MAP technique can by the nitrogen in sewage, phosphorus, is subject in recent years extensive concern.As quick in Fujian, the yellow race buys, " chemical precipitation method is removed the experimental study of ammonia nitrogen in Wastewater from Pig Farm ".(" chemistry and biotechnology ", 2005., 5:27-29.), Yuan Peng, Song Yonghui, Yuan Fang, Peng Jianfeng, " experimental study of nutritive element in the waste water of raising pigs is removed and reclaimed to ammoniomagnesium phosphate crystal method " (" ACTA Scientiae Circumstantiae ", 2007,27(7): 1127-1134), Sun Guoping, Zhang Congliang, Wang Yan, " MAP crystallization process is removed nitrogen, phosphorus processing condition in piggery wastewater " (" ecological and rural environment journal ", 2010., 26(3): 268-272) etc. priority has been made report to chemical phosphorus removal method and processing condition.But most experimental researches that are limited to influence factor, coherent element proportioning and processing condition etc., and application is also few in productivity sewage disposal.
Contriver Wang Ye duty, Wang Ruoxue, Li Qinsheng once with " artificial biological film processing raise pigs sewage new technology " for topic to the technology being adopted, product and technical process at " pollution prevention technique " magazine (2011.24(6): 26-29-56) on made concise and to the point report, look into its content of new proof through recent home and abroad and be very different with the experimental study tool having been reported.In the present invention, also comprised that technical process improves and gordian technique wherein, and the sewage disposal demonstration project of raising pigs passes through the inspection of a year and a half actual motion effect, reached or be better than the new progress such as livestock and poultry cultivation sewage drainage standard of Pearl River Delta.
Summary of the invention
A kind of method that has been to provide high phosphorus, high-ammonia-nitrogen sewage dephosphorization denitrogenation, resource to reclaim is provided, easy to implement the method, dephosphorization, denitrogenation are carried out simultaneously, and its resultant can be used as fertilizer and recycles, treatment effect is good, cost is low, easy and simple to handle, without the discharge of excess sludge or chemical sludge.Solve the processing problem containing raise pigs sewage and other similar organic sewage of high concentration phosphorus and ammonia nitrogen, reached or be better than the emission standard that country allows, reduced receiving water body phosphorus, nitrogen nutrition load, reduced body eutrophication, protected water surrounding.
In order to realize above-mentioned object, the present invention adopts following technical measures:
Contriver Wang Ye duty, Wang Ruoxue, Li Qinsheng once with " artificial biological film processing raise pigs sewage new technology " for topic to the technology being adopted, product and technical process at " pollution prevention technique " magazine (2011.24(6): 26-29-56) on made concise and to the point report, look into its content of new proof through recent home and abroad and be very different with the experimental study tool having been reported.In the present invention, also comprised that technical process improves and gordian technique wherein, and the sewage disposal demonstration project of raising pigs passes through the inspection of a year and a half actual motion effect, reached or be better than the new progress such as livestock and poultry cultivation sewage drainage standard of Pearl River Delta.The feature of this technique is in the natural pond liquid of raising pigs after sewage biogas fermentation is processed, and adopts the artificial biological film tertiary treatment of difference in functionality polyP bacteria, and biological denitrification denitrogenation, dephosphorization are generated to ammonium magnesium phosphate method with chemical dephosphorization and combine, and improves decontamination effect improving.
The method that high phosphorus, high-ammonia-nitrogen sewage dephosphorization denitrogenation, resource reclaim, by the 100 ton per days sewage disposal scale of raising pigs, the steps include:
A, enter in sewage collecting pool at the natural pond liquid of sewage after biogas fermentation of raising pigs, then enter modified pond.Plate-like micro-hole aerator (specification ф 178, every square meter 2-3, uniform plane is arranged) is installed in modified pond, by 4KW blower fan air feed, aeration 2-6 hour, the pH to 7.5-9 of raising sewage, utilizes the endogenous Mg in sewage
++, NH
4-n
+, and PO
4 -3ion forms ammonium magnesium phosphate precipitation, reaches and removes part phosphorus and ammonia nitrogen, reclaims as fertilizer sources, and all the other sewage enter in artificial biological film low-level culture pool and process; If phosphorus content is too high in this stage sewage, or endogenous magnesium ion is when not enough, adds in right amount mixed magnesium salt 1-10kg, is uniformly mixed after accelerated reaction in 4-6 hour by stirrer (2.2KW) under water, allows its quiescent setting within 12 hours, reclaim ammonium magnesium phosphate fertilizer again.
B, in artificial biological film low-level culture pool, bottom is provided with micro-hole aerator (uniform plane is arranged for specification ф 178, every square meter 2-3), by 7.5kw blower fan intermittent gas supply, sets up aerobic/anaerobic or anaerobic environment.In artificial biological film low-level culture pool, laying the artificial biomembrane floating suspended device 500-1000 being produced by Yishengquan Biological Science & Tech. Development Co., Ltd., Wuhan overlaps.
The installation method of artificial biomembrane floating suspended device (ZL200920229801.X): for making artificial biomembrane floating suspended device relatively fixing in treating pond, when use can with corrosion-resistant, be difficult for aging plastic ties and will after the ball float series winding on float suspended device, be fixed on the hook of wall for the treatment of pond.
In artificial biological film low-level culture pool, adopt containing the artificial biological film (Yishengquan Biological Science & Tech. Development Co., Ltd., Wuhan) of genus bacillus polyP bacteria and nitrobacteria and be staggeredly placed, its major function is to decompose macromole, utilize COD to do C source, carry out denitrification dephosphorization denitrification; By the sewage of raising pigs after treatment enter artificial biological film secondary pond, artificial biological film is processed in three grades of ponds.
C, lay 10 of the aeration tubes (uniform plane placement) of 20m in artificial biological film second-stage treatment pond bottom, by 2.2kw blower fan air feed; In pond, lay artificial biomembrane floating suspended device 200-500 cover (the same B of laying method).On artificial biological film in artificial biological film secondary pond, be fixed with genus bacillus (Yishengquan Biological Science & Tech. Development Co., Ltd., Wuhan) and photosynthetic bacterium class polyP bacteria (Yishengquan Biological Science & Tech. Development Co., Ltd., Wuhan), adopt aeration tube intermittent aeration.
D. bottom in artificial biological film tertiary treatment pond, lay 10 of the aeration tubes (uniform plane placement) of 20m, by 2.2kw blower fan air feed; In pond, respectively lay artificial biomembrane floating suspended device 200-500 cover (the same B of laying method).The artificial biological film that artificial biological film tertiary treatment pond adopts photosynthetic bacterium to prepare.
Artificial biological film (ZL200610124636.2) prepared by application different microorganisms, by above-mentioned A, B, C, the effect of D step denitrification dephosphorization denitrification, realizes the object of dephosphorization and ammonia nitrogen, then enters oxidation pond.
E. oxidation pond processing: by phosphorus, nitrogen more than planting aquatic plants absorption of residual in the pool.According to the difference in area and season, select local suitable non-hibernating eggs class (as logical heart dish, green water cress etc.).These plant growings, on artificial floating bed movably, are convenient to results.And by the difference of various plant growth rates, arranging plantation and harvest time, the waterplant of results is as the green fodder of pig.
The sewage treatment process of raising pigs taking artificial biological film as core technology above, more simplify than the original report of contriver, because this system is in actual motion, can reach or be better than legal emission standard to the oxidation pond stage, artificial swamp can be simplified, and can save land area; Before modified pond, whether need solid-liquid separation, can be by how many and determine compared with the content of large granular solids thing in the sewage on each pig farm.In addition, the kind of artificial biological film, consumption and supplementary material thereof appropriately adjust because of character, the scale of disposing of sewage as aerating apparatus and power of fan etc.
Artificial biological film prepared by application polyP bacteria is realized sewage dephosphorization, denitrogenation:
This sewage dephosphorization of raising pigs, denitrifying method are the artificial biological films that adopts fixing polyP bacteria to prepare on carrier, complete denitrification nitrogen and phosphorus removal effect by the polyP bacteria in film, outside born of the same parents, generate containing polyphosphoric acid salt (poly-P) and poly beta-hydroxybutyrate (PHB) composite junction crystal, and be aided with chemical dephosphorization reaction generation ammonium magnesium phosphate (MAP) crystalline deposit.This two classes xln all can be used as high-quality phosphate fertilizer and recycles, thereby phosphorus and the ammonia nitrogen of the sewage middle and high concentration of raising pigs are removed in a large number.
In the present invention, polyP bacteria used comprises genus bacillus and photosynthetic bacterium:
Different polyP bacterias is fixed respectively and makes different artificial biological films, and be placed in corresponding artificial biological film treating pond, by aerobic/anaerobic condition alternately, utilize COD for the nitration product that C source and nitrobacteria provide, realize and release phosphorus/poly-phosphorus process and denitrification nitrogen and phosphorus removal.
Generation is reacted in the said ammonium magnesium phosphate crystallization of the present invention in the modified pond of sewage disposal:
The utilization already present Mg in sewage that raises pigs
++, NH
4-n
+, and PO
4 -3ion, improves pH value by modified pond aeration, makes to generate ammonium magnesium phosphate.Aeration, stirring and pH value are the important factors that affects crystallization content.
When endogenous magnesium ion is not enough in sewage phosphorus content is higher, can in modified pond, add mixing magnesium salts.Its effect both can improve pH value to 8.5-9.0, also can strengthen ammonia nitrogen and react with phosphatic, improved both clearances;
Range of application of the present invention:
The invention is not restricted to the sewage disposal of raising pigs, also can be containing other organic sewage processing of high concentration phosphorus and ammonia nitrogen efficient dephosphorization, denitrogenation method are provided.
The present invention compared with prior art, has the following advantages and effect:
1. the sewage treatment facility of raising pigs and technical process are succinct, and the application artificial biological film processing sewage of raising pigs belongs to the first;
2. save energy, reduces working cost: in treating processes, adopt intermittent aeration, save energy consumption more than 30%;
3. management, easy and simple to handle;
4. crossed over experimental stage, reached sewage treatment project and practice, and obtained sewage disposal reuse up to standard, nitrogen, reclamation of phosphorus resource utilization, without the good result of mud, wastewater disposition.
Brief description of the drawings
Fig. 1 is a kind of artificial biological film processing sewage process flow diagram of raising pigs
Wherein: 1 one sewage collecting pools; 2 one modified ponds; 3 one 1 grade of artificial biological film ponds; 4 one 3 grades of ponds of 5 one artificial biological film, 2 grades of artificial biological films ponds; 6 one oxidation pond
Figure 1A is a kind of Poly-P-PHB composite junction crystal being formed by polyP bacteria enrichment photo in kind
Phosphate-containing 40% in xln, sudan black dyeing is for black, water insoluble, is dissolved in acid.
Figure 1B is a kind of Poly-P-PHB composite junction crystal being formed by polyP bacteria enrichment photo in kind
Crystallization adularescent and light brown, form differs, the little not enough mm of crystallization, and large xln can exceed cm.
Embodiment
Embodiment 1:
A kind of method that high phosphorus, high-ammonia-nitrogen sewage dephosphorization denitrogenation, resource reclaim: the 100 tons of scales of per diem disposing of sewage are calculated, and the steps include:
A, raising pigs, the natural pond liquid of sewage after biogas fermentation enters in sewage collecting pool 1, then pump into modified pond 2, therein by plate-like micro-hole aerator (specification ф 178,2.5 of every square meters, (uniform plane placement) 145, by 4KW blower fan air feed, continuous aeration 6 hours, the pH to 7.5-9 that improves sewage, now produces a large amount of foams in sewage, utilize the endogenous Mg in sewage
++, NH
4-n
+, and PO
4 -3ion forms ammonium magnesium phosphate crystallization, allows it precipitate, and can remove phosphorus and the part ammonia nitrogen of approximately 40% left and right in sewage, reclaims fertilizer.If now in sewage, phosphorus content is too high, or endogenous magnesium ion is when not enough, adds in right amount mixed magnesium salt 1-10kg, improves the growing amount of phosphoric acid magnesium salts and the clearance of phosphorus.
B, in artificial biological film low-level culture pool 3, microporous aeration device (specification ф 178,2.5 of every square meters are installed at the bottom of pond; 500 (uniform plane placement)) by 7.5kw blower fan intermittent aeration, ventilate 4 hours, shut down 2 hours; repeatedly carry out, set up aerobic/anaerobic or anaerobic environment.In artificial biological film low-level culture pool, lay artificial biomembrane floating suspended device 600 and overlap (laying method is with summary of the invention B), wherein 450 covers are staggeredly placed containing the artificial biological film of genus bacillus polyP bacteria and 150 cover nitrobacterias, its function is to decompose macromole, utilize COD to do C source, carry out denitrification dephosphorization denitrification; The sewage of raising pigs after treatment is entered in artificial biological film secondary pond 4, three grades of ponds 5 of artificial biological film and processed.
C, lay long 10 of the aeration tubes (uniform plane placement) of 20m in 4 bottoms, artificial biological film second-stage treatment pond, by 2.2kw blower fan air feed; In pond, respectively lay artificial biomembrane floating suspended device 250 and overlap (laying method is with summary of the invention B).On artificial biological film in artificial biological film secondary pond 4, be fixed with genus bacillus and photosynthetic bacterium class polyP bacteria, adopt aeration tube intermittent aeration, ventilate 2 hours, stop 10 hours.
In D, artificial biological film tertiary treatment pond 5, long 10 of the aeration tubes (uniform plane placement) of 20m are laid in bottom, by 2.2kw blower fan air feed; In pond, respectively lay artificial biomembrane floating suspended device 250 and overlap (laying method is with summary of the invention B).The artificial biological film that in three grades of pond 5 treating ponds of artificial biological film prepared by the polyP bacteria of main application photosynthetic bacterium class, adopts aeration tube intermittent aeration.
The installation method of E, artificial biomembrane floating suspended device: for making artificial biomembrane floating suspended device relatively fixing in treating pond, when use can with corrosion-resistant, be difficult for aging plastic ties and will after the ball float series winding on float suspended device, be fixed on the hook of wall for the treatment of pond.
By their denitrification dephosphorization denitrification effect, realize dephosphorization and ammonia nitrogen, the recycling precipitate generating at artificial biological film 1-3 level treating pond is made fertilizer, enters oxidation pond 6 through the sewage of raising pigs of A, B, C, D step process.
The effect of high phosphorus, high-ammonia-nitrogen sewage processing technological flow
A. the sewage disposal demonstration project of raising pigs application example:
(1) patent applicant applies the New Technology about Wastewater Treatment of raising pigs taking artificial biological film as core, has set up the novel process of sewage disposal.Comprising the processing of biogas fermentation-modified pond-artificial biological film 1-3 level, remaining phosphorus and ammonia nitrogen, be converted into green fodder by oxidation pond waterplant and recycle, finally make water quality reach or be better than the Pearl River Delta livestock and poultry sewage drainage standard (table 1) of raising pigs, check and accept by local Environmental Protection Agency.
Pig farm, table 1. Ru Hu farm purification system each unit water quality detection result (mg/L)
(2) denitrogenation of artificial biological film:
The use such as Wang Yeqin are fixed with artificial biological film prepared by the genus bacillus of denitrification denitrogenation effect and the purification system of the common composition of nitrobacteria microbial film, there is the powerful function that transforms ammonia nitrogen and nitrite nitrogen, can almost all remove ammonia nitrogen and nitrite nitrogen wherein, show that artificial biological film has very high denitrification efficiency (Wang Yeqin, Li Qinsheng.The denitrogenation of 2009. artificial biological films." pollution prevention technique magazine ", 22(6): 17-22); And with the artificial biological film processing denitrification denitrogenation effect that the effect of sewage further confirmed artificial biological film of raising pigs.
(3) polyP bacteria comes extracellular poly-phosphate crystalline particle:
Patent applicant has collected the polyphosphoric acid salt crystalline particle that application bacterial strain forms outside born of the same parents.These granular sizes differ, and little diameter is not as good as mm, and large crystallization diameter can exceed cm.Color is light brown or white, water insoluble, is dissolved in the diluted acid of the vitriol oil and heating.This crystalline particle phosphorus content reaches 13% by analysis, is equivalent to contain 40% poly-phosphate.It can, by sudan black B stain, be partly dissolved by chloroform, meets the characteristic of poly beta-hydroxybutyrate (PHB).The structural formula of this class complex body is as follows.
The structural formula of PHB-Poly-P
This is first tangible evidence about polyP bacteria biological phosphate-eliminating that applicant obtains.(seeing Figure 1A-1B).It should be noted that this class material has very high using value at aspects such as medicine, the energy and chemical industry.
(4) ammonium magnesium phosphate precipitator method chemical dephosphorization:
Its concrete steps are:
1. first aeration is driven away the carbonic acid gas in sewage, and more than improving the pH to 8.0 of sewage, a part of phosphorus in sewage and ammonium, magnesium ion reaction generate ammonium magnesium phosphate crystallization at that time;
2. then start stirrer and drop into magnesium salts mixture in treating pond, further improve pH to 9 left and right, then ammonium magnesium phosphate precipitation is produced in reaction;
3. then stop stirring, allow crystalline deposit, is reclaimed as fertilizer sources utilization, reach the object of removal nitrogen, phosphorus.
The experimental study of the high ammonia nitrogen pharmaceutical wastewater of embodiment 2. high phosphorus dephosphorization denitrogenation:
A. applicant adopts and mixes magnesium salts processing high phosphorus, high ammonia nitrogen medicine factory effluent, in this waste water, ammonia nitrogen concentration is up to 1400mg/L, phosphorus concentration up to 1360mg/L. in the time dropping into 1-2% magnesium salts in waste water, and more than 90% phosphorus in waste water and the ammonia nitrogen of 32-50% are by magnesium salts Adsorption.
Its concrete steps are:
1. more than first aeration improves the pH to 8.0 of medical sewage;
2. then start stirrer and drop into magnesium salts mixture in treating pond, further improve pH to 9 left and right, then ammonium magnesium phosphate precipitation is produced in reaction;
3. stop stirring, allow ammonium magnesium phosphate crystalline deposit, is reclaimed, reach the object of removal nitrogen, phosphorus.
B. the dephosphorization effect of polyP bacteria bacterial strain to high phosphorus waste water:
Patent applicant selects 5 bacillus and 1 strain photosynthetic bacterium, detects the phosphorus ability of taking the photograph of their medical fermentation waste waters to high phosphorus, high ammonia nitrogen.Initial ammonia nitrogen concentration is up to 1400mg/L, and phosphorus concentration only has phosphorus 0-20mg/L up to the general sanitary sewage of 1360mg/L(), after 22 hours shaking tables are cultivated, the phosphorus amount of taking the photograph of 6 bacterial strains between 210-310mg/L, average out to 260mg/L.
Claims (1)
1. high phosphorus, high-ammonia-nitrogen sewage dephosphorization denitrogenation, an its recovery method as resource, the steps include:
A, the natural pond liquid of sewage after biogas fermentation of raising pigs enter in sewage collecting pool (1), then enter modified pond (2), and plate-like micro-hole aerator is installed in modified pond, make pH to 7.5-9 by blower fan aeration, utilize the endogenous Mg in sewage
2+, NH
4 +-N and PO
4 3-ion forms ammonium magnesium phosphate precipitation, optionally adds mixing magnesium salts, is uniformly mixed after accelerated reaction by stirrer under water, allows its quiescent setting reclaim ammonium magnesium phosphate fertilizer again, and all the other sewage enter in artificial biological film low-level culture pool (3) and process;
B, in artificial biological film low-level culture pool (3), bottom is provided with micro-hole aerator, by blower fan intermittent gas supply, in artificial biological film low-level culture pool (3), lay artificial biomembrane floating suspended device, wherein be staggeredly placed containing the artificial biological film of genus bacillus polyP bacteria and nitrobacteria, decompose macromole, utilize COD to do C source, carry out denitrification dephosphorization denitrification; The sewage of raising pigs after treatment is entered in artificial biological film secondary pond (4), three grades of ponds of artificial biological film (5) and processed;
C, lay aeration tube in artificial biological film secondary pond (4) bottom, by blower fan intermittent gas supply; In pond, lay artificial biomembrane floating suspended device, on artificial biological film, be fixed with genus bacillus polyP bacteria and photosynthetic bacterium class polyP bacteria;
In D, three grades of ponds of artificial biological film (5), aeration tube is laid in bottom, by blower fan air feed, lays artificial biomembrane floating suspended device in pond, the artificial biological film that adopts photosynthetic bacterium polyP bacteria to prepare;
E. oxidation pond (6) is processed: by phosphorus, nitrogen more than planting aquatic plants absorption of residual in the pool, according to the difference in area and season, select logical heart dish, green water cress plant growing on mobile artificial floating bed, and by the difference of various plant growth rates, arrange plantation and harvest time, the waterplant of results is as the green fodder of pig;
Described artificial biological film is purchased from Yishengquan Biological Science & Tech. Development Co., Ltd., Wuhan.
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