CN103304101B - Resource utilization and regeneration circulation utilization device for livestock and poultry breeding wastewater - Google Patents

Resource utilization and regeneration circulation utilization device for livestock and poultry breeding wastewater Download PDF

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CN103304101B
CN103304101B CN201310259358.1A CN201310259358A CN103304101B CN 103304101 B CN103304101 B CN 103304101B CN 201310259358 A CN201310259358 A CN 201310259358A CN 103304101 B CN103304101 B CN 103304101B
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China
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ammonia nitrogen
water
utilization
nitrogen removal
breeding wastewater
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CN201310259358.1A
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Chinese (zh)
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CN103304101A (en
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张世文
徐琛
林锦松
许雅玲
李丹
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波鹰(厦门)科技有限公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/40Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

Abstract

The invention discloses a resource utilization and regeneration circulation utilization device for livestock and poultry breeding wastewater. The device comprises an anaerobic tank, a grid tank, an adjusting tank, an ammonia-nitrogen removing device, a biological aerated filter (BAF), a disinfecting tank, a sludge tank, a sludge filter press and a gas collecting device, wherein the ammonia-nitrogen removing device can be in one of the modes of struvite precipitation method ammonia-nitrogen removal and blow-off method ammonia-nitrogen removal. The device is based on the combination of an anaerobic technique, a denitrification technique, a BAF technique and a disinfection technique, the livestock and poultry breeding wastewater is used as the resource and is subjected to anaerobic fermentation treatment to generate biogas, the wastewater is further subjected to solid-liquid separation after the biogas is generated, the solid residue is used as the raw material for producing an organic fertilizer to produce the organic fertilizer, the wastewater is subjected to BAF technique and disinfection and is subsequently recycled and discharged by being up to standard, the treatment effect is good, the energy consumption is low, the resource is comprehensively utilized, and economical benefits are achieved.

Description

A kind of utilization of resources of livestock breeding wastewater and recycling utilization device
Technical field
The present invention relates to a kind of utilization of resources and recycling utilization device of livestock breeding wastewater, particularly relate to a kind of based on anaerobic technology, denitride technology, the livestock breeding wastewater comprehensive utilization of resources of BAF technology and disinfection technology and waste water reclamation recycling device, it is particularly resource with livestock breeding wastewater, by it by anaerobically fermenting process, produce biogas, produce the waste water after biogas again through solid-liquid separation, solid slag is used for the raw material as producing organic fertilizer, produce organic fertilizer, waste water utilizes and qualified discharge through BAF technology and sterilization Posterior circle again, belong to the field for the treatment of of water pollution of environmental engineering.
Background technology
Livestock and poultry farm waste water mainly comprises urine, ight soil and breeding house wash-down water, such concentration of organic wastewater is high, its COD be 5000 ~ 13000mg/L, BOD is that 5000 ~ 6000 mg/L(water rush ight soil, lower same), suspended substance is many, SS is 17000 ~ 20000 mg/L, ammonia-nitrogen content is high, ammonia nitrogen is 600 ~ 1000 mg/L, and stink is large.Aquaculture waste water belongs to the high concentrated organic wastewater being rich in a large amount of pathogenic agent, and direct discharge enters water body or storage place is improper, enters water body, may cause the severe exacerbation of surface water or quality of groundwater by rain-out.Because the leaching of Animal fecal pollution is very strong, the leaching such as the nitrogen in fecaluria, phosphorus and water soluble organic substance are very large, if do not dealt carefully with, will enter Water table polluted underground water by rainwash and diafiltration.To earth's surface water mitigation then main manifestations be that, after large amount of organic matter enters water body, the dissolved oxygen that organic decomposition will consume in water in a large number, makes water body smelly; After the dissolved oxygen in water body significantly declines, large amount of organic matter can under anaerobic continue to decompose, and will produce the toxic gas such as methane, hydrogen sulfide, cause hydrobiont mortality in decomposition; A large amount of suspended substances in waste water can make water body muddy, reduce the photosynthesis of algae in water, limit hydrobiological normal activity, make the hydrobiont of Organic pollutants sensitivity dead gradually, thus aggravate water bottom anoxic further, water body assimilative capacity is reduced; Nitrogen, phosphorus can make body eutrophication, the result of eutrophication can make NO3-N and NO2-N excessive concentration in water body, if people and animals' long-term drinking can cause poisoning, and the growth of some toxic algae and amount reproduction can discharge a large amount of toxin in water body, cause the mortality of hydrocoles, thus seriously destroy water ecology balance; Some germ, viruses etc. in fecaluria may cause some epiphytotics propagation etc. with water flow.
Comprehensive utilization and the large class of process qualified discharge two are mainly contained to the treatment process of mass-producing livestock and poultry farm liquid dung both at home and abroad.Comprehensive utilization is the good approach that biomass energy utilized, and built the ecological agriculture and ensured agricultural sustainable development at many levels.But, at present because China's livestock and poultry farm feeding and management method falls behind, add the not in place of the front anaerobic treatment of comprehensive utilization, often make livestock and poultry liquid dung produce many problems in the process of comprehensive utilization, as large in waste water generation, complicated component, process after stain substrate concentration still very high, the used dilution water yield are many and affect by seasonal duty.For process qualified discharge, although technical process used is both at home and abroad roughly the same, i.e. solid-liquid separation-anaerobic digestion-aerobic treatment.
1, solid-liquid separation
No matter livestock and poultry farm waste water adopts what system or aggregate measures to process, all first must carry out solid-liquid separation, this is one requisite process procedure, its importance and meaning are mainly: first, in the waste water that general plant emits, solid suspension content is very high, reach as high as 160000mg/L, corresponding organic content is also very high, the pollutant load amount of liquid portion can be made greatly to reduce by solid-liquid separation; Secondly, can prevent larger solids from entering subsequent disposal link by solid-liquid separation, prevent the blocking damage etc. of equipment.In addition, before Anaerobic Digestion, carry out solid-liquid separation also can increase anaerobic digestion maintainability, reduce the size of anaerobic reactor and the required residence time, reduce facility investment and improve the removal efficiency of COD.Solid-liquid separation technique generally comprises: sieving, centrifugal, filter, floating except operations such as, sedimentation, precipitation, flocculations.At present, China has ripe solid-liquid separation technique and corresponding equipment, and its device type mainly contains screen mesh type, horizontal centrifuge, pressure filter and hydrocyclone, rotary conic sieve and centrifuge disc type separating machine etc.
2, anaerobic treatment
Because aquaculture waste water belongs to " three is high " waste water of high organic concentration, high N, P content and high harmful microorganism quantity.Therefore anaerobic technology becomes indispensable gordian technique in livestock and poultry farm treatment for cow manure.For the organic waste water of this high density of plant, adopt anaerobic digestion process can effectively remove a large amount of dissolved organic matters under lower running cost, COD clearance reaches 85% ~ 90%, and can kill disease carrying germ, is conducive to the epidemic prevention of plant.If directly adopt the aquaculture waste water after aerobic process process solid-liquid separation, although one-time investment can save 20%, but because its power consumed is large, flow of power water consumption is 10 times more than of anaerobic treatment, and therefore long-term working cost brings heavy economical load by plant.
Anaerobic technique at present for the treatment of feces of farm is a lot, and having of wherein comparatively commonly using is following several: anaerobic filter (AF), up-flow anaerobic sludge blanket (UASB), hybrid anaerobic reactor (UASB+AF), two phase anaerobic digestion method and flow lifting type sludge bed reactor (USR) etc.In recent years, anaerobic digestion and biogas fermentation technology have been widely used in plant's refuse process, having reached more than 2000 places to the big-and-middle-sized biogas engineering quantity of 2002 China's livestock and poultry farm in the end of the year, is have one of maximum country of firedamp gas equipment quantity in the world.Although be also no lack of the example of failure in the biogas engineering construction of China, engineering construction success ratio is only 85%, this technology be can yet be regarded as and solved the most effective technical scheme of innoxious and resource utilization problem of swine manure wastewater.The waste water that feces of livestock and poultry and plant produce is valuable resource, both can realize innoxious through Anaerobic Digestion, can also reclaim biogas and organic fertilizer simultaneously, and therefore building biogas engineering will be the optimal selection that middle-size and small-size plant fecal sewage is administered.
3, aerobic treatment
Aerobic treatment refers to a kind of technique making good use of oxygen animalcule process breeding wastewater.Aerobic biological process method can be divided into natural aerobic treatment and the large class of artificial aerobic treatment two.Natural Aerobic biological process method is the method utilizing the microorganism in natural water body and soil to purify liquid waste, and also known as natural ecological resource method, mainly contains water body purification and soil sanitation two kinds.The former mainly contains oxidation pond (aerobic ponds, facultative lagoon, anaerobic pond) and culture pond etc.; The latter mainly contains land treatment systems (filter of slow rate, rapid method, overland flow) and artificial swamp etc.Natural ecological resource method not only capital cost is low, and power consumption is few, and this method is to the nutrition such as organism, nitrogen phosphorus of bio-refractory and the clearance of bacterium also higher than the second-stage treatment of routine, and part can reach the effect of tertiary treatment.In addition, under certain condition, this method coordinates sewage irrigation can realize sewage recycling utilization.The shortcoming of this method mainly large and treatment effect of floor space is subject to seasonal effect etc.If but plant's small scale and near have the discarded ditch pool and beach for when utilizing, the method should be selected with investment reduction and processing costs as far as possible.Artificial Aerobic biological process takes artificial-strengthening oxygen supply to improve the method for wastewater treatment of aerobic microbiological vigor.The method mainly contains activated sludge process, biological filter, blodisc, biological contact oxidation process, sequencing batch active sludge (SBR), aerobic/anaerobic (A/O) and oxidation ditch process etc.With regard to treatment effect, the treatment effect of contact oxidation method and blodisc is better than activated sludge process, although the treatment effect of biological filter is also fine, is easy to occur filter tank latch up phenomenon.Oxidation ditch, SBR and A/O technique all belong to the activated sludge process of improvement.Oxidation ditch effluent quality is good, generation mud amount is few, also can carry out denitrogenation processing to sewage, but BOD loading of its process is little, floor space is large, working cost is high.SBR method automatic controlling level is high, can carry out advanced treatment to sewage, but its shortcoming to be BOD loading less, one-time investment is also large.A/O body is a kind of active sludge treatment process having removal BOD and denitrogenation dual function concurrently, although its investment is bigger than normal, the water after this method process is easy to qualified discharge.Therefore large for those cultivation scales, waste water generation is many and have the plant of stronger economic capability can select A/O method, and for aerobic treatment processes such as the optionally connected tactile oxidation of medium scale plant and blodiscs.
The step of Chinese patent CN200110060847.5 process breeding wastewater is: sewage regulates anaerobic acidification is hydrolyzed aerobic treatment flocculation sediment waste water adsorbs.
Chinese patent CN200610062628.X, discloses a kind for the treatment of process of livestock breeding wastewater, mainly comprises the following steps: first waste water of livestock poultry to be injected equalizing tank, carries out aeration agitation; Flocculation sediment is carried out in reaction preliminary sedimentation tank; Before and after more pending waste water being injected two-part, fill out the membrane bioreactor being placed with active sludge; In the rear end of membrane bioreactor, ultra-filtration membrane is installed; After pending waste water carries out biological degradation in membrane bioreactor, discharge again after being filtered by ultra-filtration membrane; Forward and backward two sections of membrane bioreactor can also arrange micro-hole aerator and boring aeration device carries out Air Exposure to waste water respectively.
Chinese patent CN201220350995.0 discloses a kind of livestock breeding wastewater treatment unit, comprise equalizing tank, anaerobism EGSB reactor, intermediate sedimentation pond and multi-functional filter tower, wherein equalizing tank is connected on anaerobism EGSB reactor by pipeline, pipeline is connected with between anaerobism EGSB reactor and intermediate sedimentation pond, connecting tube between intermediate sedimentation pond and multifunctional bio filter tower, multifunctional bio filter tower moral water outlet is divided into two-way, wherein a road is connected on the water-in of equalizing tank, and another road utilizes to hold with the external world and is connected.
From existing treatment technology and technique, there are following some shortcomings: 1, major part takes anaerobism coagulation, cut down most COD, but be not very high to the clearance of nitrogen, phosphorus.2, nitrogen, phosphor resource can not fully be recycled, and enter the easy body eutrophication of water body.3, build that such investment needed for treatment for cow manure facility is too large, working cost is too high.Therefore, seek that facility investment is few, working cost is low and process efficient aquaculture treatment for cow manure method, become the key point solving aquaculture and pollute.
Summary of the invention
The object of the invention is to overcome prior art Problems existing, there is provided a kind of to combine based on anaerobic digestion methane production technology, BAF technology, disinfection technology, treatment effect is good, energy consumption is low and accomplish that the novel livestock breeding wastewater utilization of resources and the waste water reclamation recycling device of economic benefit etc. are created in comprehensive utilization of resources simultaneously.
A kind of utilization of resources of livestock breeding wastewater and recycling utilization device are provided with anaerobic pond, grating tank, equalizing tank, ammonia nitrogen removal device, BAF (BAF), sterilization pool, sludge sump, dewatering and filtering mud machine, gas collector;
The import of described anaerobic pond connects with the outlet of livestock breeding wastewater, the outlet of anaerobic pond connects with the import of grating tank, the outlet of grating tank connects with the import of equalizing tank, the outlet of equalizing tank connects with the import of ammonia nitrogen removal device, the outlet of ammonia nitrogen removal device connects with BAF (BAF) water-in, effluent of aeration biological filter mouth connects with sterilization pool water-in, sterilization pool water outlet connects with water collecting basin, reuse water 60 ~ 80% in water collecting basin for plant's cycling use of water, 20 ~ 40% qualified discharges; Anaerobic pond pneumatic outlet connects with gas collector import; Throw out (i.e. mud) outlet in slag in grating tank, equalizing tank and BAF all connects with sludge sump import, and sludge sump outlet connects with sludge filter press import.
Described ammonia nitrogen removal device can be the one in struvite precipitator method ammonia nitrogen removal and blow-off method ammonia nitrogen removal.
The ammonia nitrogen that described struvite precipitator method ammonia nitrogen removal produces is reacted by magnesium salts, phosphoric acid salt or hydrophosphate and generates magnesium ammonium phosphate MgNH4PO46H2O double salt precipitation, described magnesium salts can be the one in magnesium chloride, magnesiumcarbonate, magnesium sulfate, magnesium hydroxide, magnesium oxide, and described phosphoric acid salt can be the one in Sodium phosphate dibasic, phosphoric acid.
The stripping equipment of described blow-off method ammonia nitrogen removal is the one in strengthening formula stripping pond (bubbling pond) and tower stripping device (stripping tower), and stripping tower is divided into again packing tower and tray column.
The ammonia nitrogen that described blow-off method ammonia nitrogen removal produces is absorbed by mineral acid and generates ammonium salt; Described mineral acid is the one of hydrochloric acid, sulfuric acid, phosphoric acid or nitric acid.
The filtrate of described BAF is the one in zeolite filler, ceramic grain filter and volcanics filtrate.
Described sterilization is the one of electrosterilization, ozonization, chlorine disinfectant or disinfection by ultraviolet light.
The adjacent two interelectrode voltages of the electrolysis machine of described electrosterilization are 2 ~ 12V, and current density is 10 ~ 320mA/cm 2.
The electrolysis machine of described electrosterilization is provided with power supply and electrolyzer; Electrode materials in described electrolyzer is the one in graphite, titanium, iron, aluminium, zinc, copper, lead, nickel, molybdenum, chromium, alloy and nano-catalytic inert material.
The top layer of described nano-catalytic noble electrode is coated with the metal oxide inertia catalyst coatings that crystal grain is 10 ~ 35nm, and the substrate of described nano-catalytic noble electrode is titanium plate or plastic plate.
Technical scheme of the present invention is: livestock breeding wastewater → anaerobic digestion methane production → slagging-off → ammonia nitrogen removal → BAF biochemistry → sterilization → qualified discharge.
The present invention had both overcome the defect of alone anaerobism, aerobic treatment high cost, and the utilization of resources overcoming again conventional cultivating wastewater purification method is not high, and treatment effect is undesirable, and the wastewater flow rate of discharge is large, the defects such as contaminate environment.Compared with the prior art, there is following outstanding advantages:
(1) by anaerobic digestion, produce biogas, change refuse is resource, produces bioenergy, and reduce cost for wastewater treatment, resources utilization degree is high;
(2) can be realized the recycling of ammonia nitrogen by the struvite precipitator method, precipitin reaction is not by the restriction of temperature, water intoxication element, and design and operation are all very simple, effectively can process the ammonia nitrogen waste water of high density.Realize the recycling of struvite, product struvite contains nitrogen, phosphorus composition, is a kind of good slow-release fertilizer;
(3) ight soil is by after anaerobic digestion, dewatered sludge is obtained again after solid-liquid separation, the mud obtained and tangerine bar, the chaff of grain processing, the grouts mixing secondary fermentation of Oil processing are obtained organic fertilizer, add again composite fertilizer and step (3) denitrogenation precipitate to obtain compoiste fertilizer, resources utilization degree is dark;
(4) after the biochemical treatment of aeration biochemical filter tank, thoroughly pollutant in water is decomposed by the oxygenolysis of aerobic microbiological;
(5) the strong oxidizing property free radical produced by nano-catalytic electrolysis removes colourity in waste water and stink further, reduces the index such as ammonia nitrogen, COD, and kills the microorganisms such as the bacterium in waste water, make reuse water water conditioning, meet recycle water quality requirement;
(6) reuse water water conditioning, 60 ~ 80% for plant's cycling use of water, 20 ~ 40% qualified discharges, and the cyclic utilization rate of water is high, and discharge is few.
Accompanying drawing explanation
Fig. 1 is the utilization of resources of a kind of livestock breeding wastewater of the present invention and the structure composition schematic diagram of recycling utilization device employing struvite precipitator method ammonia nitrogen removal;
Fig. 2 is the utilization of resources of a kind of livestock breeding wastewater of the present invention and the structure composition schematic diagram of recycling utilization device employing blow-off method ammonia nitrogen removal.
Embodiment
The present invention is the design of the refining plant to livestock breeding wastewater completed after the composition to existing livestock breeding wastewater, character and existing processing scheme go deep into the comparative study of system, it by the united application of the methods such as anaerobic digestion methane production, ammonia nitrogen removal, biological treatment, sterilization, thus forms a kind of utilization of resources and the waste water reclamation recycling device that are particularly suitable for livestock breeding wastewater.
With reference to the accompanying drawings 1, accompanying drawing 2 illustrates the specific embodiment of the present invention.
Two groups is adopt the utilization of resources of the present embodiment livestock breeding wastewater and the specific implementation method of recycling utilization device below.
First group of embodiment:
With reference to Fig. 1, the utilization of resources of livestock breeding wastewater and a recycling utilization device, comprising: anaerobic pond 1, grating tank 2, equalizing tank 3, struvite precipitator method ammonia nitrogen removal device 4, BAF 5, sterilization pool 6, water collecting basin 7, sludge gas collecting device 8, sludge sump 9, sludge filter press 10, lift pump 11, lift pump 12, lift pump 13.The import of anaerobic pond 1 connects with the outlet of livestock breeding wastewater, anaerobic pond 1 water outlet connects through the import of lift pump 11 with grating tank 2, the pneumatic outlet of anaerobic pond 1 connects with the import of gas collector 8, the water outlet of grating tank 2 connects with the water-in of equalizing tank 3, the water outlet of equalizing tank 3 connects through the water-in of lift pump 12 with struvite precipitator method ammonia nitrogen removal device 4, the water outlet of struvite precipitator method ammonia nitrogen removal device 4 connects with the water-in of BAF 5, the water outlet of BAF 5 connects through the water-in of lift pump 13 with sterilization pool 6, sterilization pool 6 water outlet connects with water collecting basin 7, 60 ~ 80% for plant's cycling use of water, 20 ~ 40% qualified discharges, and grating tank 2, equalizing tank 3, struvite precipitator method ammonia nitrogen removal device 4, throw out (i.e. mud) outlet in BAF 5 all connects with sludge sump 9 import, sludge sump 9 outlet connects with dewatering and filtering mud machine 10 import.
Embodiment 1
The utilization of resources of 500 ton per day livestock breeding wastewaters and waste water reclamation circulation utilization method.
Described livestock breeding wastewater water-quality guideline is as shown in table 1 after measured.
The water-quality guideline of table 1 livestock breeding wastewater
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 5000 5 Ammonia nitrogen mg/L 1000
2 SS mg/L 20000 6 Excrement colibacillus group Individual/L 2.5×10 7
3 BOD 5 mg/L 2900 7 Roundworm egg Individual/L 15000
4 Total phosphorus mg/L 150
(1) anaerobic treatment
Livestock breeding wastewater enters anaerobic pond 1 after being collected by pipeline, in anaerobic pond 1, under anerobe, the hold concurrently absorption of oxygen bacterium, fermentation, methane phase acting in conjunction, organic substance decomposing is become methane and carbon dioxide, improved the B/C value of waste water by anaerobic treatment, improve the biodegradability of waste water; The methane and carbon dioxide produced collects storage by gas collector 8;
The water-quality guideline (supernatant liquor) of livestock breeding wastewater after table 2 anaerobic digestion
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 620 4 Ammonia nitrogen mg/L 830
2 SS mg/L 500 5 Total phosphorus mg/L 11
3 BOD 5 mg/L 380
(2) remove the gred
Livestock breeding wastewater after anaerobic treatment enters grating tank 2 through row of conduits, carries out isolation and removes, and collect ight soil slag to cursory thing thick in waste water, to prevent follow-up treatment facility blocking.Waste water after grating tank 2 processes, flows into equalizing tank 3, carries out water quality, runoff investigation, and be separated precipitation in equalizing tank 3.
(3) ammonia nitrogen removal
Equalizing tank 3 water outlet flows into struvite precipitator method ammonia nitrogen removal device 4 through pipeline, and waste water is after struvite precipitator method ammonia nitrogen removal device 4, and ammonia nitrogen is effectively removed, and clearance reaches 50 ~ 90%.
The step of above-mentioned struvite precipitator method ammonia nitrogen removal is: equalizing tank 3 water outlet flows into struvite precipitator method ammonia nitrogen removal device 4 reaction tank through pipeline, through chemicals dosing plant under agitation, in certain n(Mg): n(N): n(P)=1:1:1 ratio, first add a certain amount of magnesium chloride and Sodium phosphate dibasic, keep the rotating speed of 50-800 rev/min, with the sodium hydroxide solution adjust pH to 8.0 of 10%, the ammonia nitrogen in waste water and Mg 2+, PO 4 3-(or HPO 4 2-) reaction generation magnesium ammonium phosphate MgNH 4pO 46H 2o double salt precipitation, is commonly called as struvite, carries out precipitate and separate after reacting completely, thus removes the ammonia nitrogen in breeding wastewater; The throw out (i.e. mud) of struvite precipitator method ammonia nitrogen removal is sent in sludge sump 8 through pump and pipeline, and finally in sludge filter press 10, carry out filtering separation, and reclaim struvite, water outlet then enters BAF 5.
The water-quality guideline (supernatant liquor) of livestock breeding wastewater after table 3 ammonia nitrogen removal
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 550 4 Ammonia nitrogen mg/L 13
2 SS mg/L 30 5 Total phosphorus mg/L 10
3 BOD 5 mg/L 460
(4) BAF biochemistry (BAF is biochemical)
Waste water after ammonia nitrogen removal process enters BAF 5, is purified waste water by oxidation degradation effect, removes COD, SS and ammonia nitrogen further, is purified waste water.
(5) sterilize
Waste water is after BAF 5 biochemical treatment, and the electrolysis machine of water outlet again in sterilization pool 6 is disinfected, and can remove colourity further, and carries out sterilization and disinfection to waste water, last qualified discharge.The adjacent two interelectrode voltages of electrolysis machine are 2V, and current density is 200mA/cm 2.
(6) sludge treatment
The mud that slag in grating tank 2, equalizing tank 3 and aeration biochemical filter tank 5 biochemical treatment produce all enters sludge sump 9 by pipeline, and the dehydration then through sludge filter press 10 obtains dewatered sludge, can as fertilizer.
Effluent quality index is as shown in table 2 after measured.
The water-quality guideline of table 5 water outlet
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 pH 6.8 7 Total dissolved solid mg/L 930
2 Colourity Doubly 8 8 Total phosphorus mg/L 0.1
3 Smell Without unplessantness displeasure 9 SS mg/L 2
4 COD Cr mg/L 40 10 Ammonia nitrogen mg/L 3
5 BOD 5 mg/L 1 11 Excrement colibacillus group Individual/L 1
6 Turbidity NUT ≤3 12 Roundworm egg Individual/L Do not detect
As known from Table 5, effluent quality meets GB/T18920-2002 " urban sewage reutilization-urban reclaimed water water quality standard ".
Embodiment 2
The utilization of resources of 1200 ton per day livestock breeding wastewaters and waste water reclamation circulation utilization method.
Described livestock breeding wastewater water-quality guideline is as shown in table 6 after measured.
The water-quality guideline of table 6 livestock breeding wastewater
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 13000 5 Ammonia nitrogen mg/L 1000
2 SS mg/L 16500 6 Excrement colibacillus group Individual/L 2×10 7
3 BOD 5 mg/L 4500 7 Roundworm egg Individual/L 12000
4 Total phosphorus mg/L 180
(1) anaerobic digestion methane production
Livestock breeding wastewater enters anaerobic pond 1 after being collected by pipeline, in anaerobic pond 1, under anerobe, the hold concurrently absorption of oxygen bacterium, fermentation, methane phase acting in conjunction, organic substance decomposing is become methane and carbon dioxide, improved the B/C value of waste water by anaerobic treatment, improve the biodegradability of waste water; The methane and carbon dioxide produced collects storage by gas collector 8;
The water-quality guideline (supernatant liquor) of livestock breeding wastewater after table 7 anaerobic digestion
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 710 4 Ammonia nitrogen mg/L 950
2 SS mg/L 450 5 Total phosphorus mg/L 13
3 BOD 5 mg/L 480
(2) remove the gred
Livestock breeding wastewater after anaerobic treatment enters grating tank 2 through row of conduits, carries out isolation and removes, and collect ight soil slag to cursory thing thick in waste water, to prevent follow-up treatment facility blocking.Waste water after grating tank 2 processes, flows into equalizing tank, carries out water quality, runoff investigation, and be separated precipitation in equalizing tank 3.
(3) ammonia nitrogen removal
Equalizing tank 3 water outlet flows into struvite precipitator method ammonia nitrogen removal device 4 through pipeline, and waste water is after struvite precipitator method ammonia nitrogen removal device 4, and ammonia nitrogen is effectively removed, and clearance reaches 50 ~ 90%.
The step of described struvite precipitator method ammonia nitrogen removal is: equalizing tank 3 water outlet flows into struvite precipitator method ammonia nitrogen removal reaction tank 4 through pipeline, through chemicals dosing plant under agitation, in certain n(Mg): n(N): n(P)=1.4:1:1.2 ratio, first add a certain amount of magnesium chloride and Sodium phosphate dibasic, keep the rotating speed of 50-800 rev/min, with the sodium hydroxide solution adjust pH to 10.0 of 10%, the ammonia nitrogen in waste water and Mg 2+, PO 4 3-(or HPO 4 2-) reaction generation magnesium ammonium phosphate MgNH 4pO 46H 2o double salt precipitation, is commonly called as struvite, carries out precipitate and separate after reacting completely, thus removes the ammonia nitrogen in breeding wastewater; The throw out (i.e. mud) of struvite precipitator method ammonia nitrogen removal is sent in sludge sump 9 through pump and pipeline, and finally in sludge filter press 10, carry out filtering separation, and reclaim struvite, water outlet then enters BAF 5.
The water-quality guideline (supernatant liquor) of livestock breeding wastewater after table 8 ammonia nitrogen removal
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 350 4 Ammonia nitrogen mg/L 15
2 SS mg/L 28 5 Total phosphorus mg/L 1
3 BOD 5 mg/L 300
(4) BAF biochemistry (BAF is biochemical)
Waste water after ammonia nitrogen removal process enters BAF 5, is purified waste water by oxidation degradation effect, removes COD, SS and ammonia nitrogen further, is purified waste water.
The water-quality guideline (supernatant liquor) of livestock breeding wastewater after table 9 BAF biochemistry
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 41 4 Ammonia nitrogen mg/L 5
2 SS mg/L 3 5 Total phosphorus mg/L 0.05
3 BOD 5 mg/L 1
(5) sterilize
Waste water is after BAF 5 biochemical treatment, and the electrolysis machine of water outlet again in sterilization pool 6 is disinfected, and can remove colourity further, and carries out sterilization and disinfection to waste water, last qualified discharge.The adjacent two interelectrode voltages of electrolysis machine are 6V, and current density is 320mA/cm 2.
(6) sludge treatment
The mud that slag in grating tank 2, equalizing tank 3 and aeration biochemical filter tank 5 biochemical treatment produce all enters sludge sump 9 by pipeline, and the dehydration then through sludge filter press 10 obtains dewatered sludge, can as fertilizer.
Effluent quality index is as shown in table 10 after measured.
The water-quality guideline of table 10 water outlet
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 pH 7.3 7 Total dissolved solid mg/L 690
2 Colourity Doubly 6 8 Total phosphorus mg/L 0.05
3 Smell Without unplessantness displeasure 9 SS mg/L 1
4 COD Cr mg/L 35 10 Ammonia nitrogen mg/L 3
5 BOD 5 mg/L 1 11 Excrement colibacillus group Individual/L 1
6 Turbidity NUT ≤2 12 Roundworm egg Individual/L Do not detect
As known from Table 10, effluent quality meets GB/T18920-2002 " urban sewage reutilization-urban reclaimed water water quality standard ".
Second group of embodiment:
With reference to Fig. 2, the present embodiment comprises: anaerobic pond 1, grating tank 2, equalizing tank 3, blow-off method ammonia nitrogen removal device 4, BAF 5, sterilization pool 6, water collecting basin 7, sludge gas collecting device 8, sludge sump 9, sludge filter press 10, lift pump 11, lift pump 12, lift pump 13, ammonia absorption device 14.The import of anaerobic pond 1 connects with the outlet of livestock breeding wastewater, anaerobic pond 1 water outlet connects through the import of lift pump 11 with grating tank 2, the pneumatic outlet of anaerobic pond 1 connects with the import of gas collector 8, the water outlet of grating tank 2 connects with the water-in of equalizing tank 3, the water outlet of equalizing tank 3 connects through the water-in of lift pump 12 with blow-off method ammonia nitrogen removal device 4, the water outlet of blow-off method ammonia nitrogen removal device 4 connects with the water-in of BAF 5, the pneumatic outlet of blow-off method ammonia nitrogen removal device 4 connects with ammonia absorption device 14, the water outlet of BAF 5 connects through the water-in of lift pump 13 with sterilization pool 6, sterilization pool 6 water outlet connects with water collecting basin 7, 60 ~ 80% for plant's cycling use of water, 20 ~ 40% qualified discharges, and grating tank 2, equalizing tank 3, throw out (i.e. mud) outlet in BAF 5 all connects with sludge sump 9 import, sludge sump 9 outlet connects with the import of sludge filter press 10.
Below for adopting the utilization of resources of livestock breeding wastewater and the specific implementation method of recycling utilization device of the present embodiment.
The utilization of resources of 2000 ton per day livestock breeding wastewaters and waste water reclamation circulation utilization method.
Described livestock breeding wastewater water-quality guideline is as shown in table 11 after measured.
The water-quality guideline of table 11 livestock breeding wastewater
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 7500 5 Ammonia nitrogen mg/L 600
2 SS mg/L 17000 6 Excrement colibacillus group Individual/L 3×10 7
3 BOD 5 mg/L 3900 7 Roundworm egg Individual/L 10000
4 Total phosphorus mg/L 110
(1) anaerobic treatment
Livestock breeding wastewater enters anaerobic pond 1 after being collected by pipeline, in anaerobic pond 1, under anerobe, the hold concurrently absorption of oxygen bacterium, fermentation, methane phase acting in conjunction, organic substance decomposing is become methane and carbon dioxide, improved the B/C value of waste water by anaerobic treatment, improve the biodegradability of waste water; The methane and carbon dioxide produced is collected by gas collector 8;
The water-quality guideline (supernatant liquor) of livestock breeding wastewater after table 12 anaerobic digestion
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 510 4 Ammonia nitrogen mg/L 560
2 SS mg/L 320 5 Total phosphorus mg/L 9
3 BOD 5 mg/L 370
(2) remove the gred
Breeding wastewater after anaerobic treatment enters grating tank 2 through row of conduits, carries out isolation remove cursory thing thick in waste water, to prevent follow-up treatment facility blocking.Waste water after grating tank 2 processes, flows into equalizing tank 3, carries out water quality, runoff investigation, and be separated precipitation in equalizing tank 3.
(3) ammonia nitrogen removal
Equalizing tank 3 water outlet flows into blow-off method ammonia nitrogen removal device 4 through pipeline, and waste water is after blow-off method ammonia nitrogen removal device 4, and ammonia nitrogen is effectively removed, and clearance reaches 50 ~ 90%.
The gas device for collecting ammonia gas 14 that blow-off method produces except ammonia is collected, and and inorganic acid reaction, generate ammonium salt; Blow-off method except the stripping equipment of ammonia be the one in strengthening formula stripping pond (bubbling pond) and tower stripping device (stripping tower) etc., stripping tower is divided into again packing tower and tray column.
The water-quality guideline (supernatant liquor) of livestock breeding wastewater after table 13 ammonia nitrogen removal
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 508 4 Ammonia nitrogen mg/L 35
2 SS mg/L 30 5 Total phosphorus mg/L 1
3 BOD 5 mg/L 365
(4) BAF biochemistry (BAF is biochemical)
Waste water after the process of blow-off method ammonia nitrogen removal device 4 enters BAF 5, is purified, remove COD, SS and ammonia nitrogen further, be purified waste water by oxidation degradation effect to waste water.
(5) sterilize
Waste water is after BAF 5 biochemical treatment, and water outlet is disinfected through the electrolysis machine of sterilization pool 6 again, can remove colourity further, and carries out sterilization and disinfection to waste water, last qualified discharge.The adjacent two interelectrode voltages of electrolysis machine are 12V, and current density is 100mA/cm 2.
(6) sludge treatment
The mud that slag in grating tank 2, equalizing tank 3 and aeration biochemical filter tank 5 biochemical treatment produce all enters sludge sump 9 by pipeline, and the dehydration then through sludge filter press 10 obtains dewatered sludge, can as fertilizer.
Effluent quality index is as shown in Table 15 after measured.
The water-quality guideline of table 15 water outlet
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 pH 6.7 7 Total dissolved solid mg/L 720
2 Colourity Doubly 8 8 Total phosphorus mg/L 0.1
3 Smell Without unplessantness displeasure 9 SS mg/L 1
4 COD Cr mg/L 30 10 Ammonia nitrogen mg/L 8
5 BOD 5 mg/L 1 11 Excrement colibacillus group Individual/L 1
6 Turbidity NUT ≤3 12 Roundworm egg Individual/L Do not detect
As known from Table 15, effluent quality meets GB/T18920-2002 " urban sewage reutilization-urban reclaimed water water quality standard ".

Claims (6)

1. the utilization of resources of livestock breeding wastewater and a recycling utilization device, is characterized in that: comprise anaerobic pond, grating tank, equalizing tank, ammonia nitrogen removal device, BAF (BAF), sterilization pool, sludge sump, sludge filter press, gas collector;
The import of described anaerobic pond connects with the outlet of livestock breeding wastewater, the outlet of anaerobic pond connects with the import of grating tank, the outlet of grating tank connects with the import of equalizing tank, the outlet of equalizing tank connects with the import of ammonia nitrogen removal device, the outlet of ammonia nitrogen removal device connects with BAF (BAF) water-in, effluent of aeration biological filter mouth connects with sterilization pool water-in, and sterilization pool water outlet connects with water collecting basin, and the electrolysis machine in sterilization pool is provided with power supply and electrolyzer; Electrode materials in described electrolyzer is nano-catalytic noble electrode, the top layer of nano-catalytic noble electrode is coated with the metal oxide inertia catalyst coatings that crystal grain is 10 ~ 35nm, the substrate of described nano-catalytic noble electrode is titanium plate or plastic plate, reuse water 60 ~ 80% in water collecting basin is for plant's cycling use of water, 20 ~ 40% qualified discharges, anaerobic pond pneumatic outlet connects with gas collector import; Throw out outlet in equalizing tank, ammonia nitrogen removal device and aeration biochemical filter tank all connects with sludge sump import, and sludge sump outlet connects with sludge filter press import.
2. the utilization of resources of a kind of livestock breeding wastewater as claimed in claim 1 and recycling utilization device, is characterized in that: described ammonia nitrogen removal device is the one in struvite precipitator method ammonia nitrogen removal and blow-off method ammonia nitrogen removal.
3. the utilization of resources of a kind of livestock breeding wastewater as claimed in claim 2 and recycling utilization device, is characterized in that: the ammonia nitrogen that described struvite precipitator method ammonia nitrogen removal produces is reacted by magnesium salts, phosphoric acid salt or hydrophosphate and generates magnesium ammonium phosphate MgNH 4pO 46H 2o double salt precipitation, described magnesium salts is the one in magnesium chloride, magnesiumcarbonate, magnesium sulfate, and described hydrophosphate is Sodium phosphate dibasic.
4. the utilization of resources of a kind of livestock breeding wastewater as claimed in claim 2 and recycling utilization device, it is characterized in that: the stripping equipment of described blow-off method ammonia nitrogen removal is the one in strengthening formula stripping pond or tower stripping device, and tower stripping device is divided into packing tower or tray column.
5. the utilization of resources of a kind of livestock breeding wastewater as claimed in claim 2 and recycling utilization device, it is characterized in that: the ammonia nitrogen that described blow-off method ammonia nitrogen removal produces is absorbed by mineral acid and generates ammonium salt, and described mineral acid is the one of hydrochloric acid, sulfuric acid, phosphoric acid or nitric acid.
6. the utilization of resources of a kind of livestock breeding wastewater as claimed in claim 1 and recycling utilization device, is characterized in that: the filtrate of described BAF is the one in zeolite filler, ceramic grain filter or volcanics filtrate.
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