CN103304101A - 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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CN103304101A
CN103304101A CN2013102593581A CN201310259358A CN103304101A CN 103304101 A CN103304101 A CN 103304101A CN 2013102593581 A CN2013102593581 A CN 2013102593581A CN 201310259358 A CN201310259358 A CN 201310259358A CN 103304101 A CN103304101 A CN 103304101A
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utilization
ammonia nitrogen
water
breeding wastewater
nitrogen removal
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CN2013102593581A
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CN103304101B (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, particularly take livestock breeding wastewater as resource, it is processed by anaerobically fermenting, produce biogas, waste water behind the production biogas is again through solid-liquid separation, solid slag is used for as the raw material of producing organic fertilizer, produce organic fertilizer, waste water belongs to the water pollution control field of environmental engineering again through recycle and qualified discharge after BAF technology and the sterilization.
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 is that 5000 ~ 13000mg/L, BOD are 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 that is rich in a large amount of pathogenic agent, and direct discharging enters water body or storage place is improper, is subjected to rain-out to enter water body, may cause the severe exacerbation of surface water or quality of groundwater.Because the leaching of livestock and poultry fecaluria is very strong, the leaching amounts such as the nitrogen in the fecaluria, phosphorus and water soluble organic substance are very large, as not dealing carefully with, will enter the Water table polluted underground water by rainwash and diafiltration.On the impact of surface water then main manifestations be that after large amount of organic matter enters water body, organic decomposition will consume the dissolved oxygen in the water in a large number, make water body smelly; After the dissolved oxygen in the water body significantly descended, large amount of organic matter can under anaerobic continue to decompose, and will produce the toxic gases such as methane, hydrogen sulfide in the decomposition, causes the hydrobiont mortality; A large amount of suspended substances in the waste water can make water body muddy, reduce the photosynthesis of algae in the water, limit hydrobiological normal activity, make the hydrobiont of Organic pollutants sensitivity dead gradually, thereby further aggravate the water bottom anoxic, the water body assimilative capacity is reduced; Nitrogen, phosphorus can make body eutrophication, the result of eutrophication can make in the water body nitrate and nitrite concentration too high, if people and animals' long-term drinking can cause poisoning, and the growth of some poisonous algae and amount reproduction can discharge a large amount of toxin in water body, cause the mortality of hydrocoles, thereby seriously destroyed the water ecology balance; Some germs in the fecaluria, virus etc. may cause some epiphytotics propagation etc. with water flow.
Both at home and abroad the treatment process of mass-producing livestock and poultry farm liquid dung mainly contained comprehensive utilization and process qualified discharge two large classes.Comprehensive utilization is the good approach that the ecological agriculture and assurance agricultural sustainable development were utilized, built to biomass energy at many levels.But, at present because China's livestock and poultry farm feeding and management method is backward, 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,, complicated component large such as the waste water generation, processing after stain substrate concentration still very high, the used dilution water yield are many and irrigated by season to affect etc.For processing qualified discharge, although used technical process is roughly the same both at home and abroad, 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 must at first carry out solid-liquid separation, this is one requisite process procedure, its importance and meaning mainly are: at first, solid suspension content is very high in the waste water that general plant emits, reach as high as 160000mg/L, corresponding organic content is also very high, by solid-liquid separation the pollutant load amount of liquid portion is reduced greatly; Secondly, can prevent that by solid-liquid separation larger solids from entering the subsequent disposal link, prevent the obstruction damage of equipment etc.In addition, before Anaerobic Digestion, carry out solid-liquid separation and also can increase the anaerobic digestion maintainability, reduce the size of anaerobic reactor and the required residence time, reduce facility investment and improve the removal efficient of COD.Solid-liquid separation technique generally comprises: sieving, centrifugal, filter, floating except operations such as, sedimentation, precipitation, flocculations.At present, the existing ripe solid-liquid separation technique of China and corresponding equipment, 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 height " waste water of high organic concentration, high N, P content and high harmful microorganism quantity.Therefore anaerobic technology becomes indispensable gordian technique in the dirty processing of livestock and poultry farm excrement.For the organic waste water of this high density of plant, adopt anaerobic digestion process under lower running cost, effectively to remove a large amount of dissolved organic matters, the 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 is processed solid-liquid separation, although one-time investment can save 20%, but because the power of its consumption is large, the flow of power water consumption is 10 times more than of anaerobic treatment, and therefore long-term working cost will bring heavy economical load to plant.
At present a lot of for the treatment of the anaerobic technique of feces of farm, 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 is that the biogas fermentation technology has been widely used in plant's refuse processing, having reached more than 2000 to the big-and-middle-sized biogas engineering quantity of 2002 China's livestock and poultry farms in the end of the year and located, is to have in the world one of maximum country of firedamp gas equipment quantity.Although, in the biogas engineering construction of China, also being no lack of the example of failure, the engineering construction success ratio only is 85%, the can yet be regarded as the most effective technical scheme of the innoxious and resource utilization problem that solves swine manure wastewater of this technology.The waste water that feces of livestock and poultry and plant produce is valuable resource, and the process Anaerobic Digestion both can realize innoxious, 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 make good use of a kind of technique that oxygen animalcule is processed breeding wastewater.The aerobe facture can be divided into natural aerobic treatment and artificial aerobic treatment two large classes.Natural aerobe facture is the method for utilizing natural water body and the microorganism in the soil to purify liquid waste, also claims the natural biology facture, mainly contains two kinds of water body purification and soil sanitations.The former mainly contains oxidation pond (the aerobic pool, facultative lagoon, anaerobic pond) and culture pond etc.; The latter mainly contains the soil and processes (slow rate, rapid method filter, overland flow) and artificial swamp etc.Natural biology facture not only capital cost is low, and power consumption is few, and this method also is higher than conventional second-stage treatment to the clearance of the nutrition such as the organism of bio-refractory, nitrogen phosphorus and bacterium, and part can reach the effect of tertiary treatment.In addition, under certain condition, this method cooperates sewage irrigation can realize the sewage recycling utilization.The shortcoming of this method mainly is that the 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 when utilizing, should select the method to save investment and processing costs as far as possible.It is to take the artificial-strengthening oxygen supply to improve the method for wastewater treatment of aerobic microbiological vigor that artificial aerobe is processed.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 the filter tank latch up phenomenon.Oxidation ditch, SBR and A/O technique all belong to improved activated sludge process.The oxidation ditch effluent quality is good, generation mud amount is few, also can carry out denitrogenation processing to sewage, but the BOD loading of its processing 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 that its shortcoming is BOD loading is less, and one-time investment is also large.The A/O body is a kind of active sludge treatment process of removing BOD and denitrogenation dual function that has concurrently, although its investment is bigger than normal, the water after this method is processed is easy to qualified discharge.Therefore large for those cultivation scales, the waste water generation is many and have the plant of stronger economic capability can select the A/O method, and for aerobic treatment processes such as the optionally connected tactile oxidation of medium scale plant and blodiscs.
The step that Chinese patent CN200110060847.5 processes breeding wastewater is: sewage is regulated The anaerobic acidification hydrolysis Aerobic treatment Flocculation sediment Waste water absorption.
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; In the reaction preliminary sedimentation tank, carry out flocculation sediment; Before and after more pending waste water being injected two-part, fill out the membrane bioreactor that is placed with active sludge; Rear end at membrane bioreactor is equipped with ultra-filtration membrane; Pending waste water carries out biological degradation in membrane bioreactor after, again discharging after filtering by ultra-filtration membrane; Forward and backward two sections of membrane bioreactor can also arrange respectively micro-hole aerator and the boring aeration device carries out Air Exposure to waste water.
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 the anaerobism EGSB reactor by pipeline, be connected with pipeline between anaerobism EGSB reactor and the intermediate sedimentation pond, connecting tube between intermediate sedimentation pond and the multifunctional bio filter tower, multifunctional bio filter tower moral water outlet is divided into two-way, wherein one the tunnel be connected on the water-in of equalizing tank, another road is connected with the extraneous end that utilizes.
From existing treatment technology and technique, exist following some shortcomings: 1, major part is taked the anaerobism coagulation, has subdued most COD, but is 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 the required investment of the dirty treatment facility of such excrement is too large, working cost is too high.Therefore, seek that facility investment is few, working cost is low and the aquaculture excrement pollution discharge treatment method of highly-efficient treatment, become and solve the key point that aquaculture is polluted.
Summary of the invention
The object of the invention is to overcome the problem that prior art exists, provide a kind of and combine based on anaerobic digestion methane production technology, BAF technology, disinfection technology, treatment effect is good, energy consumption is low and accomplish that comprehensive utilization of resources creates the novel livestock breeding wastewater utilization of resources and the waste water reclamation recycling device of economic benefit etc. 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, the effluent of aeration biological filter mouth connects with the sterilization pool water-in, the sterilization pool water outlet connects with water collecting basin, reuse water 60 ~ 80% in the water collecting basin is used for plant's cycling use of water, 20 ~ 40% qualified discharges; The anaerobic pond pneumatic outlet connects with the gas collector import; Throw out in slag in the grating tank, equalizing tank and the BAF (being mud) outlet all connects with the sludge sump import, and the sludge sump outlet connects with the sludge filter press import.
Described ammonia nitrogen removal device can be a kind of in struvite precipitator method ammonia nitrogen removal and the blow-off method ammonia nitrogen removal.
The ammonia nitrogen that described struvite precipitator method ammonia nitrogen removal produces generates magnesium ammonium phosphate MgNH4PO46H2O double salt precipitation by magnesium salts, phosphoric acid salt or hydrophosphate reaction, described magnesium salts can be a kind of in magnesium chloride, magnesiumcarbonate, sal epsom, magnesium hydroxide, the magnesium oxide, and what described phosphoric acid salt can be in Sodium phosphate dibasic, the phosphoric acid is a kind of.
The stripping equipment of described blow-off method ammonia nitrogen removal is a kind of in reinforcement formula stripping pond (bubbling pond) and the 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 a kind of of hydrochloric acid, sulfuric acid, phosphoric acid or nitric acid.
The filtrate of described BAF is a kind of in zeolite filler, ceramic grain filter and the volcanics filtrate.
Described sterilization is a kind of of electrosterilization, ozonization, chlorine disinfectant or disinfection by ultraviolet light.
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 the described electrolyzer is a kind of in graphite, titanium, iron, aluminium, zinc, copper, lead, nickel, molybdenum, chromium, alloy and the 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 defective of alone anaerobism, aerobic treatment high cost, and the utilization of resources that has overcome again conventional breeding wastewater treatment process is not high, and treatment effect is undesirable, and the wastewater flow rate of discharging is large, the defectives such as contaminate environment.Compared with the prior art, have following outstanding advantages:
(1) by anaerobic digestion, produce biogas, the change refuse is resource, produces bioenergy, reduces cost for wastewater treatment, utilization of resources degree is high;
(2) can realize the recycling of ammonia nitrogen by the struvite precipitator method, precipitin reaction is not subjected to the restriction of temperature, water intoxication element, and design and operation are all very simple, can effectively process the ammonia nitrogen waste water of high density.Realize the recycling of struvite, the product struvite contains nitrogen, phosphorus composition, is a kind of good slow-release fertilizer;
(3) ight soil by anaerobic digestion after, again through getting dewatered sludge after the solid-liquid separation, the mud and tangerine bar, the chaff of grain processing, the grouts mixing secondary fermentation of Oil processing that obtain are got organic fertilizer, add again composite fertilizer and step (3) denitrogenation precipitate to get compoiste fertilizer, the utilization of resources is deep;
(4) through after the aeration biochemical filter tank biochemical treatment, the oxygenolysis by aerobic microbiological thoroughly decomposes pollutant in water;
(5) the strong oxidizing property free radical that produces by the nano-catalytic electrolysis further removes colourity and the stink in the waste water, reduces the indexs such as ammonia nitrogen, COD, and kills the microorganisms such as bacterium in the waste water, so that the reuse water water conditioning satisfies the recycle water quality requirement;
(6) reuse water water conditioning, 60 ~ 80% are used for plant's cycling use of water, 20 ~ 40% qualified discharges, the water circuit utilization ratio is high, and discharging is few.
Description of drawings
Fig. 1 is that the utilization of resources and the recycling utilization device of a kind of livestock breeding wastewater of the present invention adopts the structure of struvite precipitator method ammonia nitrogen removal to form schematic diagram;
Fig. 2 is the utilization of resources of a kind of livestock breeding wastewater of the present invention and the structure composition schematic diagram that the recycling utilization device adopts the blow-off method ammonia nitrogen removal.
Embodiment
The present invention is the design to the refining plant of livestock breeding wastewater of finishing after the comparative study of composition, character and the existing processing scheme of existing livestock breeding wastewater being goed deep into system, it uses by the combination of the methods such as anaerobic digestion methane production, ammonia nitrogen removal, biological treatment, sterilization, thereby forms a kind of utilization of resources and waste water reclamation recycling device that is particularly suitable for livestock breeding wastewater.
With reference to the accompanying drawings 1, accompanying drawing 2 explanation the specific embodiment of the present invention.
Below two groups be the utilization of resources of adopting the present embodiment livestock breeding wastewater and the specific implementation method of recycling utilization device.
First group of embodiment:
With reference to Fig. 1, a kind of utilization of resources of livestock breeding wastewater and recycling utilization device comprise: 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 outlets connect with water collecting basin 7,60 ~ 80% are used 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 in the BAF 5 (being mud) outlet all connects with sludge sump 9 imports, and sludge sump 9 outlets connect with 10 imports of dewatering and filtering mud machine.
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 collecting by pipeline, under the absorption of anerobe, the oxygen bacterium of holding concurrently, fermentation, the acting in conjunction of product methane organic substance decomposing is become methane and carbon dioxide in the process anaerobic pond 1, improve the B/C value of waste water by anaerobic treatment, improve the biodegradability of waste water; The methane and carbon dioxide that produces is collected storage by gas collector 8;
The water-quality guideline of livestock breeding wastewater (supernatant liquor) 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) slagging-off
Enter grating tank 2 through the livestock breeding wastewater after the anaerobic treatment through row of conduits, cursory thing thick in the waste water is isolated removal, and collect the ight soil slag, stop up to prevent follow-up treatment facility.Waste water through after grating tank 2 processing flows into equalizing tank 3, carries out water quality, water yield adjusting in equalizing tank 3, and precipitation is separated.
(3) ammonia nitrogen removal
Equalizing tank 3 water outlets flow into struvite precipitator method ammonia nitrogen removal device 4 through pipeline, and behind the waste water process struvite precipitator method ammonia nitrogen removal device 4, 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 outlets flow into struvite precipitator method ammonia nitrogen removal device 4 reaction tanks through pipeline, through chemicals dosing plant under agitation, in certain n(Mg): n(N): n(P)=the 1:1:1 ratio, add first a certain amount of magnesium chloride and Sodium phosphate dibasic, keep 50-800 rev/min rotating speed, sodium hydroxide solution adjust pH to 8.0 with 10%, the ammonia nitrogen in the waste water and Mg 2+, PO 4 3-(or HPO 4 2-) reaction generation magnesium ammonium phosphate MgNH 4PO 46H 2The O double salt precipitation is commonly called as struvite, carries out precipitate and separate after reacting completely, thereby removes the ammonia nitrogen in the breeding wastewater; The throw out of struvite precipitator method ammonia nitrogen removal (being mud) is sent in the sludge sump 8 through pump and pipeline, carries out at last filtering separation in sludge filter press 10, and reclaims struvite, and water outlet then enters BAF 5.
The water-quality guideline of livestock breeding wastewater (supernatant liquor) behind 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 biochemical (BAF is biochemical)
Waste water after ammonia nitrogen removal is processed enters BAF 5, by the oxidation degradation effect waste water is purified, and further removes COD, SS and ammonia nitrogen, is purified waste water.
(5) sterilization
After 5 biochemical treatments of waste water process BAF, water outlet is disinfected through the electrolysis machine in the sterilization pool 6 again, can further remove colourity, and waste water is carried out sterilization and disinfection, last qualified discharge.Adjacent two interelectrode voltages of electrolysis machine are 2V, and current density is 200mA/cm 2
(6) sludge treatment
The mud that slag in the grating tank 2, equalizing tank 3 and 5 biochemical treatments of aeration biochemical filter tank produce all enters sludge sump 9 by pipeline, and then the dehydration through sludge filter press 10 obtains dewatered sludge, can be used as fertilizer.
The 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-city miscellaneous 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 collecting by pipeline, under the absorption of anerobe, the oxygen bacterium of holding concurrently, fermentation, the acting in conjunction of product methane organic substance decomposing is become methane and carbon dioxide in the process anaerobic pond 1, improve the B/C value of waste water by anaerobic treatment, improve the biodegradability of waste water; The methane and carbon dioxide that produces is collected storage by gas collector 8;
The water-quality guideline of livestock breeding wastewater (supernatant liquor) 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) slagging-off
Enter grating tank 2 through the livestock breeding wastewater after the anaerobic treatment through row of conduits, cursory thing thick in the waste water is isolated removal, and collect the ight soil slag, stop up to prevent follow-up treatment facility.Waste water through after grating tank 2 processing flows into equalizing tank, carries out water quality, water yield adjusting in equalizing tank 3, and precipitation is separated.
(3) ammonia nitrogen removal
Equalizing tank 3 water outlets flow into struvite precipitator method ammonia nitrogen removal device 4 through pipeline, and behind the waste water process struvite precipitator method ammonia nitrogen removal device 4, 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 outlets flow 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)=the 1.4:1:1.2 ratio, add first a certain amount of magnesium chloride and Sodium phosphate dibasic, keep 50-800 rev/min rotating speed, sodium hydroxide solution adjust pH to 10.0 with 10%, the ammonia nitrogen in the waste water and Mg 2+, PO 4 3-(or HPO 4 2-) reaction generation magnesium ammonium phosphate MgNH 4PO 46H 2The O double salt precipitation is commonly called as struvite, carries out precipitate and separate after reacting completely, thereby removes the ammonia nitrogen in the breeding wastewater; The throw out of struvite precipitator method ammonia nitrogen removal (being mud) is sent in the sludge sump 9 through pump and pipeline, carries out at last filtering separation in sludge filter press 10, and reclaims struvite, and water outlet then enters BAF 5.
The water-quality guideline of livestock breeding wastewater (supernatant liquor) behind 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 biochemical (BAF is biochemical)
Waste water after ammonia nitrogen removal is processed enters BAF 5, by the oxidation degradation effect waste water is purified, and further removes COD, SS and ammonia nitrogen, is purified waste water.
The water-quality guideline (supernatant liquor) of livestock breeding wastewater behind the 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) sterilization
After 5 biochemical treatments of waste water process BAF, water outlet is disinfected through the electrolysis machine in the sterilization pool 6 again, can further remove colourity, and waste water is carried out sterilization and disinfection, last qualified discharge.Adjacent two interelectrode voltages of electrolysis machine are 6V, and current density is 320mA/cm 2
(6) sludge treatment
The mud that slag in the grating tank 2, equalizing tank 3 and 5 biochemical treatments of aeration biochemical filter tank produce all enters sludge sump 9 by pipeline, and then the dehydration through sludge filter press 10 obtains dewatered sludge, can be used as fertilizer.
The 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-city miscellaneous 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 outlets connect with water collecting basin 7,60 ~ 80% are used for plant's cycling use of water, 20 ~ 40% qualified discharges, and grating tank 2, equalizing tank 3, throw out in the BAF 5 (being mud) outlet all connects with sludge sump 9 imports, and sludge sump 9 outlets connect with the import of sludge filter press 10.
Below be the utilization of resources of the livestock breeding wastewater that adopts the present embodiment and the specific implementation method of recycling utilization device.
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 collecting by pipeline, under the absorption of anerobe, the oxygen bacterium of holding concurrently, fermentation, the acting in conjunction of product methane organic substance decomposing is become methane and carbon dioxide in the process anaerobic pond 1, improve the B/C value of waste water by anaerobic treatment, improve the biodegradability of waste water; The methane and carbon dioxide that produces is collected by gas collector 8;
The water-quality guideline of livestock breeding wastewater (supernatant liquor) 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) slagging-off
Enter grating tank 2 through the breeding wastewater after the anaerobic treatment through row of conduits, cursory thing thick in the waste water is isolated removal, stop up to prevent follow-up treatment facility.Waste water through after grating tank 2 processing flows into equalizing tank 3, carries out water quality, water yield adjusting in equalizing tank 3, and precipitation is separated.
(3) ammonia nitrogen removal
Equalizing tank 3 water outlets flow into blow-off method ammonia nitrogen removal device 4 through pipeline, and behind the waste water process blow-off method ammonia nitrogen removal device 4, ammonia nitrogen is effectively removed, and clearance reaches 50 ~ 90%.
Blow-off method is collected with device for collecting ammonia gas 14 except the gas that ammonia produces, and and inorganic acid reaction, generate ammonium salt; Blow-off method is a kind of in reinforcement formula stripping pond (bubbling pond) and the tower stripping device (stripping tower) etc. except the stripping equipment of ammonia, and stripping tower is divided into again packing tower and tray column.
The water-quality guideline of livestock breeding wastewater (supernatant liquor) behind 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 biochemical (BAF is biochemical)
Waste water after blow-off method ammonia nitrogen removal device 4 is processed enters BAF 5, by the oxidation degradation effect waste water is purified, and further removes COD, SS and ammonia nitrogen, is purified waste water.
(5) sterilization
After 5 biochemical treatments of waste water process BAF, water outlet is disinfected through the electrolysis machine of sterilization pool 6 again, can further remove colourity, and waste water is carried out sterilization and disinfection, last qualified discharge.Adjacent two interelectrode voltages of electrolysis machine are 12V, and current density is 100mA/cm 2
(6) sludge treatment
The mud that slag in the grating tank 2, equalizing tank 3 and 5 biochemical treatments of aeration biochemical filter tank produce all enters sludge sump 9 by pipeline, and then the dehydration through sludge filter press 10 obtains dewatered sludge, can be used as fertilizer.
The 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-city miscellaneous water water quality standard ".

Claims (10)

1. the utilization of resources of a livestock breeding wastewater and 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, the effluent of aeration biological filter mouth connects with the sterilization pool water-in, the sterilization pool water outlet connects with water collecting basin, reuse water 60 ~ 80% in the water collecting basin is used for plant's cycling use of water, 20 ~ 40% qualified discharges, the anaerobic pond pneumatic outlet connects with the gas collector import; Throw out outlet in equalizing tank, ammonia nitrogen removal device and the aeration biochemical filter tank all connects with the sludge sump import, and the sludge sump outlet connects with the 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 a kind of in struvite precipitator method ammonia nitrogen removal and the 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 generates magnesium ammonium phosphate MgNH by magnesium salts, phosphoric acid salt or hydrophosphate reaction 4PO 46H 2O double salt precipitation, described magnesium salts are a kind of in magnesium chloride, magnesiumcarbonate, sal epsom, magnesium hydroxide, the magnesium oxide, and described phosphoric acid salt is a kind of in Sodium phosphate dibasic, the phosphoric acid.
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 a kind of in reinforcement formula stripping pond and the tower stripping device, and tower stripping device is divided into packing tower and 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 a kind of 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 a kind of in zeolite filler, ceramic grain filter and the volcanics filtrate.
7. the utilization of resources of a kind of livestock breeding wastewater as claimed in claim 1 and recycling utilization device, it is characterized in that: described sterilization is a kind of of electrosterilization, ozonization, chlorine disinfectant or disinfection by ultraviolet light.
8. the utilization of resources of a kind of livestock breeding wastewater as claimed in claim 7 and recycling utilization device, it is characterized in that: adjacent two interelectrode voltages of the electrolysis machine of described electrosterilization are 2~12V, and current density is 10~320mA/cm 2
9. the utilization of resources of a kind of livestock breeding wastewater as claimed in claim 7 and recycling utilization device, it is characterized in that: the electrolysis machine of described electrosterilization is provided with power supply and electrolyzer; Electrode materials in the described electrolyzer is a kind of in graphite, titanium, iron, aluminium, zinc, copper, lead, nickel, molybdenum, chromium, alloy and the nano-catalytic noble electrode.
10. the utilization of resources of a kind of livestock breeding wastewater as claimed in claim 8 and recycling utilization device, it is characterized in that: 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.
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