CN101074142A - Method for circulating and reutilizing sludge during process of sewage - Google Patents
Method for circulating and reutilizing sludge during process of sewage Download PDFInfo
- Publication number
- CN101074142A CN101074142A CNA2007100422554A CN200710042255A CN101074142A CN 101074142 A CN101074142 A CN 101074142A CN A2007100422554 A CNA2007100422554 A CN A2007100422554A CN 200710042255 A CN200710042255 A CN 200710042255A CN 101074142 A CN101074142 A CN 101074142A
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- mud
- sludge
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- sewage treatment
- earthworm
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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- Fertilizers (AREA)
- Treatment Of Sludge (AREA)
Abstract
Treatment of refused pollutant is carried out by EC treating for sludge in sewage treatment plant, removing heavy metal, pesticides and antibiotics residues, entering into sludge dewatering apparatus to dewater, delivering dewatered sludge to air-drying farm to air dry, adding into additives to adjust N, P and K proportion in sludge, entering dried sludge into composting chamber to compost, transferring air to composing chamber, spraying water while timing agitating, adding into EM, fermenting, delivering manure mixture to livestock farm and feeding by earthworm. Earthworm's excrement can be used as biological organic fertilizer. It's cheap and economical.
Description
Technical field
The invention belongs to the waste pollutant processing technology field, be specifically related to mud cycling and reutilization method in a kind of sewage treatment process.
Background technology
Being created in the mankind's activity process of mud is inevitable.Any stacking of a large amount of mud that sewage disposal produces and jettison environment has been caused new pollution, how properly disposing these mud has become the common problem of paying close attention in the whole world.
Mud is the solid precipitation material that is produced by water and sewage treatment process.Refer generally to municipal drainage mud, the output of mud accounts for 0.3%～0.5% (in water ratio 97%) of sewage disposal total amount. except containing the needed nutrients of plant growth such as nitrogen, phosphorus and can improving the organism of Soil structure, also contain potential objectionable constituent such as pathogenic micro-organism, heavy metal and anthropogenics in the mud.If utilize or mishandlingly cause new environmental pollution easily.In addition along with the popularizing of sewage treatment facility, the raising of processing rate and the in-depth of degree of treatment, the generation of mud will have bigger growth, how reasonably to dispose sewage plant sludge, become the important process that municipal wastewater treatment plant and relevant departments raise the management level.Say that in a sense the quality that the handling problem of mud solves will be directly connected to the success or failure of sewage treatment project.
Following step is mainly followed in the processing of existing sludge of sewage treatment plant and disposal:
1, mud concentrates.The spissated purpose of mud is to make the mud preliminary hydro-extraction, dwindle sludge volume, for subsequent disposal creates conditions.The thickening method has gravity settling to concentrate, come-up is concentrated and other concentration method.
2, sludge digestion.In order to reduce sludge quantity, prevent contaminate environment and improve utility value, generally need through digestion process.Sludge digestion promptly is the metabolism by microorganism, makes that organic substance resolves into stable material in the mud, removes stink, kills parasitic ovum, reduces sludge volume. recycle the biogas that is produced in the digestive process.
3, sludge dewatering and mummification.Mud through concentrate and digestion after, still about 96%, volume is very big for its water ratio, is not easy to transportation and uses, and needs further dehydration and drying to handle, its main method has two kinds of spontaneous evaporation method and mechanical dehydration methods.
4, sludge incineration.Behind the sludge drying. the moisture 10%-20% that still reaches, volume is still bigger, moisture in the mud and organic impurity can be removed fully by burning. and pathogenic microbe killing.Some mud contains toxic substance and should not to do farming fertile, or when making mud be difficult to utilize because of other reason, for preventing to pollute, also adopts incinerating method, and the device of burning sludge is an incinerator.
5, the final processing of mud.When mud contains toxic substances such as heavy metal ion, also must do final processing, buried or jettison the ocean.
In the described step 5, the final disposal method of mud has the soil utilization of landfill method, mud, mud to throw sea and sludge incineration method.Because landfill will take valuable land resources, cause secondary pollution surrounding environment and underground water source, the sludge treatment mode of this backwardness is unfavorable for protecting urban ecological environment, therefore this processing mode in the coastal developed regions of China also with unworkable.
The soil utilization of mud is existing historical for many years, comprises that mainly mud is agricultural, and mud is used for forest and gardening, discards the improvement in places such as mining site etc.Contain nutritive element and essential various trace elements of Ca, Mg, Zn, Cu, the Fe etc. of plant-growth such as abundant organism and N, P, K in the mud, be applied to the farmland can improve the soil structure, increase soil fertility, promote the growth of crop.Energy consumption is low, recyclable utilizes advantage such as nutrient in the mud although the soil utilization of mud has, but also there is the danger of pathogenic bacteria diffusion and heavy metal contamination, national governments have successively issued agricultural sludge heavy-metal concentration standard and strict innoxious requirement for this reason, and the application quantity of unit surface soil mud is had strict restriction.
Because mud is thrown the negative impact (environment and biological danger of being polluted) of sea to environment, is forbidden by law in the U.S..In China, believe and to adopt the mud ocean disposal as disposal options in the future
The treatment process that with the burning is core is a treatment process the most completely, and it can make the whole carbonizations of organism, and pathogen kill can reduce sludge volume to greatest extent, the external burning process that adopt more.Dewatered sludge can be directly used in incinerator burns also and the mummification of dewatered sludge elder generation can be burned again.Burning great advantage and be can be rapidly and make reducing sludge volume largely, and does not need storing device under the atrocious weather condition again, can satisfy more and more stricter environmental requirement and fully processing be not suitable for the part mud of recycling.Sludge incineration requires mud that higher calorific value and scale and benefit are arranged, because incinerator is invested huge running cost height, reclaims the energy and just calculates.But initial cost and working cost that sludge incineration is required are higher, and the meeting of burning produces certain flue dust, the generation secondary pollution.
Summary of the invention
The object of the present invention is to provide mud cycling and reutilization method in a kind of sewage treatment process, mainly solve existing defective in the above-mentioned prior art, it not only can solve the sludge treatment problem preferably, and can also the treated mud of reasonable use and produce certain economic benefits.
For solving the problems of the technologies described above, technical scheme of the present invention is:
Mud cycling and reutilization method in a kind of sewage treatment process is characterized in that it comprises the steps:
A: sludge of sewage treatment plants is removed heavy metal, agricultural chemicals and antibiotic remains in the mud after handling through EC;
B: enter the sludge dewatering equipment dehydration, it is air-dry that mud after the dehydration is delivered to air-dry field, and adding additive, N in the mud after feasible adjusting the: P: K=98-102: 4.5-5.5: 0.8-1.2, air-dry air-dry mud is sent into the compost chamber composting, carry air, watering and process 20-26H to stir to compost chamber;
C: add EM, 1 ton of mud sprays 9-11 times of bacterium liquid of 8-12L dilution, the compost after the composting is sent in the feedlot after 18-22 days through fermentation, carries out the earthworm raising, and the movement of earthworm is as bio-organic fertilizer.
Additive among the described step B is pig manure and/or bean dregs.
EM among the described step C comprises lactobacillus, or yeast flora, or photosynthetic bacteria group, or the thread flora of fermentation fungus strain, or the Gram positive actinomycetes group.
EM among the described step C comprises:
Microbial strains Chinese preserving number
Lactococcus lactis (1.2472)
Pichia membranaefaciens (2.1039)
Candida tropicalis (2.402)
Arthrobacter citreus (1.1893)
Skin shape trichosporon (2.571)
Acetobacter aceti (1.93)
Colloid bacillus cereus (1.153)
Pseudomonas fluorescens (1.219)
Plant lactobacillus (1.124)
Crooked pseudomonas (1.42)
Geotrichum candidum (2.361)
Carbon black aspergillus (3.285)
Aspergillus niger (3.86)
Rhizopus arrhizus (3.2896)
Pseudomonas putida (1.593)
Candida utilis (2.1005)
Blown-ball Azotobacter (1.175)
Aztobacter sp (1.178)
Rhizobium leguminosarum (1.168)
Sinorhizobium meliloti (1.161)
Galega officinalis L root nodule bacterium (1.82)
Zhizopchin (3.1149)
Rhizopus oryzae (3.851)
Bacillus megaterium (1.234)
Tabin aspergillus (3.3161).
Embodiment
The invention provides mud cycling and reutilization method in a kind of sewage treatment process, that this method is used is the combination of three kinds of technology: EC (electric flocculation machine), EM (beneficial microorganism engineering bacteria), EW (earthworm).
The concrete steps of the inventive method, see also Fig. 1, after sludge of sewage treatment plants is handled through EC (electric flocculation machine), remove the heavy metal in the mud, agricultural chemicals and antibiotic remains, enter the sludge dewatering equipment dehydration then, it is air-dry that mud after the dehydration is delivered to air-dry field, and adding additive (pig manure, bean dregs etc.) adjust N in the mud, P, the K ratio, air-dry air-dry mud is sent into the compost chamber composting, carry air to compost chamber, watering is also regularly stirred, add EM (engineering bacteria), after the fermentation of for some time, the compost after the composting is sent in the feedlot, carry out the earthworm raising, movement-wormcast biological organic fertilizer of last earthworm is a kind of natural, high-quality, efficiently, multi-functional, multiduty new-type fertilizer.
Wherein:
One, sludge thickener
The effect of sludge thickener is to reduce moisture percentage in sewage sludge, reduces sludge volume, is beneficial to subsequent disposal and utilization.
Two, EC (electric flocculation machine)
1, ECS high-voltage pulse electric coagulation machine cell body
(1) model: HVES-V2300 type
(2) maximum throughput: 30M
3/ HR
(3) equipment overall dimensions: 2880W * 3400L * 3000H (mm).
(4) groove liner material: FRP (glass reinforced plastic) lining and the processing of PVC plate are formed.
(5) the outer surface material of groove: the processing of SUS304 stainless steel plate is formed.
(6) board base material: 150 * 200 joist steel weldering system is formed.
(7) the electrode board slot has the four grooves composition that is arranged in parallel.
(8) electrode dress mode: every vertical equidistantly arrangement, divide upper and lower layer combination.
(9) electricity is open above coagulating groove, and the scum silica frost canal is provided with one group of slag scraper.
(10) sewage water inlet pipe is provided with one group of electromagnetic type flow meter.
(11) bottom land is provided with two groups of automatic blowdown valves.
(12) be provided with air purge pole plate device in the cell body.
2, battery lead plate:
(1) upper strata: L length=600MM W is wide=and 560MM T is thick=the 6MM/ sheet
(2) lower floor: L length=600MM W is wide=and 600MM T is thick=the 6MM/ sheet
(3) each cell body needs: 234 (16/kg * 117 slice, 17kg * 117 slice)
The main effect of this equipment is to remove residual heavy metal, agricultural chemicals and microbiotic in the mud, pathogenic microbe killing, and removal effect can reach more than 95%.
Electricity flocculation machine is removed pollutants in waste water according to electrochemistry and physical and chemical principle.After waste water entered electric coagulation machine, under galvanic effect, following reaction took place in each electrolysis cells of electric coagulation machine.
Anode generation oxidizing reaction: metal anode is subjected to electrochemical action, and is soluble in water with ionic condition, generates metal hydroxides through hydrolysis reaction, as flocculation agent suspended substance in the waste water and colloidal impurity played cohesion; Simultaneously, OH in the waste water
-Ion is discharge generation oxygen on anode, and nascent oxygen has extremely strong oxygenizement to organic in the waste water and inorganic pollutant.
Reduction reaction takes place on the negative electrode: metal ion is obtained electronics and is reduced on negative electrode, separate out at cathode surface; Some organism generation reduction reaction particularly is in some pigment of oxidation state, and can reduce in electrolysis becomes colorless substance; H+ obtains being reduced into hydrogen behind the electronics, overflows in the micro bubble mode, can adhere to floss and oily substance in the waste water, makes its proportion diminish, and is floating to the water surface, produces the air supporting effect.This treatment facility does not add pharmaceutical chemicals, and running cost is low.
Three, sludge dewatering equipment
Can adopt the belt filter pressing dehydrator, the DYN type belt sludge dewatering equipment of producing with Wuxi Jinyuan Environment Protection Equipment Co., Ltd. is that example can select model to be: DY1000.
Moisture percentage in sewage sludge after handling through sludge dewatering equipment is about 65～85%, has realized mud decrement, the mud transportation of being more convenient for simultaneously.
Four, air-dry
Quantity: 1
The residence time: 1～2days
At air-dry sludge air drying is approximately needed 1～2 day time, make its water ratio reduce to 65～75%, for follow-up compost is prepared.Simultaneously, add pig manure, bean dregs, chicken manure or the like additive in mud in air-dry, adjust the ratio of N, P, K in the mud, make N: P: K=98-102: 4.5-5.5: 0.8-1.2 (wherein, preferred value is 100: 5: 1), the fertilizer that the output quality of making a living is good is prepared
Five, automatic compost chamber
Make mud carry out composting, reach certain degree of becoming thoroughly decomposed after, be beneficial to breeding earthworm.
Quantity: 1,0.5kwx2,5kwx1
The residence time: 20days
1, supply air system
Quantity: 1 cover
Power: 1.5kw
2, water-carriage system
Quantity: 1 cover
The water yield: 400L/day
Feedlot
Quantity: 1
The residence time: 15days
1, grid
Quantity: 20
Dimensions: 1000mmL * 500mmW * 100mmH
2, automatic breeding machine
Quantity: 1, power: 0.75kw, 2kw
Place in the feedlot grid through the compost after the compost treatment.Simultaneously, the earthworm seedling is cultured in grid.Realize the automatic breed of earthworm by automatic breeding machine.
3, sieve apparatus separates ovum cocoon earthworm excrement vermis and foreign material
0.3MM, 0.7MM, 3MM, rotary motive power inverter motor 1KW
4, feeding and distributing material machine
Seven, EM (engineering bacteria)
EM is the abbreviation of Effective Microorganisms (useful micropopulation), is to teach the profitable strain that research combines by the agricultural system of Ryukyu university than good the photograph.EM utilizes different microorganism (mainly containing thread flora, the Gram positive actinomycetes group of lactobacillus, yeast flora, photosynthetic bacteria group, the fermentation fungus strain) mixed culture of effects such as Anaerobic Bacteria and aerobic bacteria, these microorganisms are present in nature widely, most of bacterial classification is used to industries such as food-processing, to the person poultry harmless.Described EM comprises (the http://www.mircen.cn/) of Chinese common micro-organisms culture presevation administrative center preservation:
Microbial strains Chinese preserving number
Lactococcus lactis (1.2472)
Pichia membranaefaciens (2.1039)
Candida tropicalis (2.402)
Arthrobacter citreus (1.1893)
Skin shape trichosporon (2.571)
Acetobacter aceti (1.93)
Colloid bacillus cereus (1.153)
Pseudomonas fluorescens (1.219)
Plant lactobacillus (1.124)
Crooked pseudomonas (1.42)
Geotrichum candidum (2.361)
Carbon black aspergillus (3.285)
Aspergillus niger (3.86)
Rhizopus arrhizus (3.2896)
Pseudomonas putida (1.593)
Candida utilis (2.1005)
Blown-ball Azotobacter (1.175)
Aztobacter sp (1.178)
Rhizobium leguminosarum (1.168)
Sinorhizobium meliloti (1.161)
Galega officinalis L root nodule bacterium (1.82)
Zhizopchin (3.1149)
Rhizopus oryzae (3.851)
Bacillus megaterium (1.234)
Tabin aspergillus (3.3161).
Always just as microbe soil conditioner, be used for the cultivation of paddy rice, vegetables, fruit tree etc. since EM comes out, brought into play effect to improving the yield and quality.Can significantly shorten fermentation time after in the composting test of mud, adding EM, improve the quality of compost, increase the profitable strain in the wormcast fertilizer.
In the methods of the invention, the add-on of EM is: 1 ton of mud sprays 9-11 times of bacterium liquid of 8-12L dilution, the compost after the composting is sent in the feedlot after 18-22 days through fermentation, carries out the earthworm raising, and the movement of earthworm is as bio-organic fertilizer.
Eight, earthworm
Earthworm is common a kind of Lu Sheng annelid, lives in the soil, hide by day and come out at night, and with the spoilage organism food, together swallow together with earth.The also fragments such as cauline leaf of feeding plant.Earthworm can make loosing soil, improves the soil, build up fertility, and promotes agricultural produce.The earthworm in the world has kind more than 1800 approximately, and China has write down 229 kinds.The ring hair belongs to (Pheretima), and the extensive farming class is many, and there is kind more than 100 in China.
Earthworm has very high economic worth, can be used as fodder additives, bait, medicinal etc., can also handle agricultural product castoff, livestock product waste, food-processing waste and sludge from wastewater treatment plant or the like in addition, promptly can eliminate public hazards, can turn waste into wealth again.
Come breeding earthworm with treated mud, mud is changed into fertilizer-wormcast biological organic fertilizer by this link of earthworm.The wormcast fertilizer is a kind of natural, high-quality, efficient, multi-functional, multiduty new-type fertilizer.Its maximum characteristics are got up organism-microorganism-somatomedin reasonable combination exactly, reach getting fat, disease-resistant, foster native purpose.Principal feature is as follows: comprehensive nutrition, fertilizer efficiency are lasting; Protect fertilizer and preserve moisture, strengthen drought-resistant ability; Strengthen plant disease-resistant, diseases prevention ability; Improve the soil, increase yield significantly; Improve crop quality, mouthfeel, reduction nitrate content; Both can be used as fertilizer, can be used as multiple cultivation matrix again
The treatment effect of this aspect method is:
Mud has been removed heavy metal, agricultural chemicals and residues of antibiotics after this technical finesse, kill causal organism and worm's ovum in the mud.With the feed of mud as earthworm, can breed earthworm and mud can be changed into the wormcast biological organic fertilizer again, this technology has solved the mud problem of outlet, can create certain economic benefits again.Every index of wormcast biological organic fertilizer all meets the biological organic fertilizer standard after testing.
Wormcast biological organic fertilizer component list
| Project | Detected result |
| The water ratio of wormcast | 64.9％ |
| Organic content (in butt) | 32.0％ |
| Inorganic nutrients is with (N+P 2O 5+K 2O) total amount is represented | 3.2％ |
| pH | 6.7 |
| Pb | 11.8mg/kg |
| Cr | 48mg/kg |
| Cd | 0.3mg/kg |
| Hg | 1.2mg/kg |
| As | 5.6mg/kg |
Sludge of sewage treatment plant cycling and reutilization technology can change into mud high-quality and efficient wormcast biological organic fertilizer, mud is returned in the soil after necessarily handling, solved the problem of mud, also produce certain economic benefits in addition, the Economic and Efficiency Analysis that is produced is as follows: handle 3.3 ten thousand tons of calculating of mud per year, can produce 3300 tons of earthworms, 1.1 ten thousand tons of wormcast biological organic fertilizers reach more than 1,000 ten thousand yuan according to this income of two of price of earthworm on the existing market and fertilizer.Now compare sludge of sewage treatment plant transformation technology and sludge incineration processing as follows:
1, about the expense of mud cycling and reutilization technology
Mud recycle project year is handled 33,000 tons in mud (water ratio 65%), and the sludge treatment cost is 113 yuan/ton,
Every unit that takes of mud recycle project: unit
| Factory's initial cost | Year priming cost | Annual earnings | |
| Expense | 19,875,000 | 3,720,000 | 16,410,000 |
2, about having the expense of sludge incineration engineering in the method now
---concentrate---dehydration-mummification-burning---and burn grey sanitary landfill, the foundation of calculating investment and working cost is: mixing sludge amount 10,000m in technical process: primary sludge
3/ d, water ratio are 99%; The expense of sludge treatment is 191 yuan/ton (water ratio 65%).
Sludge incineration engineering cost unit: ten thousand yuan
| Expense | ||
| Processing unit | Home equipment | Import equipment |
| The mud equalizing tank | 200-300 | 200-300 |
| Dense dehydration machine room | 3,000-4,000 | 3,000-4,000 |
| Burn the field | 8,000 | 13,000 |
| The mud transportation means | 30 | 30 |
| Add up to | 11,230-12,330 | 16,230-17,330 |
Sludge incineration working cost unit/sky
| Technology category | The expense of concentrating | The dehydration expense | The burning expense | The landfill expense | Trucking costs |
| Expense | 7,250 | 19,000 | 26,833 | 500 | 1,000 |
3, about both comparisons in every respect
The comparison of sludge incineration engineering and mud recycle
| The sludge incineration engineering | The mud recycle | |
| Initial cost expense (ten thousand yuan) | 11,230--12,330 | 1,987.5 |
| Processing cost (unit/ton) | 191 | 113 |
| Environmental influence | Adopt gas-cleaning installation, still have gas contamination | May frowziness etc. |
| Recycling | Can utilize partial heat energy | Can utilize organism and N, P in the mud, K |
| The economic benefit that produces | Do not have | Have |
| Whether rationally utilize mud | Not | Be |
Being preferred embodiment of the present invention only in sum, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.
Claims (4)
1, mud cycling and reutilization method in a kind of sewage treatment process is characterized in that it comprises the steps:
A: sludge of sewage treatment plants is removed heavy metal, agricultural chemicals and antibiotic remains in the mud after handling through EC;
B: enter the sludge dewatering equipment dehydration, it is air-dry that mud after the dehydration is delivered to air-dry field, and adding additive, N in the mud after feasible adjusting the: P: K=98-102: 4.5-5.5: 0.8-1.2, air-dry air-dry mud is sent into the compost chamber composting, carry air, watering and process 20-26H to stir to compost chamber;
C: add EM, 1 ton of mud sprays 9-11 times of bacterium liquid of 8-12L dilution, the compost after the composting is sent in the feedlot after 18-22 days through fermentation, carries out the earthworm raising, and the movement of earthworm is as bio-organic fertilizer.
2, mud cycling and reutilization method in the sewage treatment process according to claim 1 is characterized in that the additive among the described step B is pig manure and/or bean dregs.
3, mud cycling and reutilization method in the sewage treatment process according to claim 1 and 2, it is characterized in that the EM among the described step C comprises lactobacillus, or yeast flora, or photosynthetic bacteria group, or the thread flora of fermentation fungus strain, or Gram positive actinomycetes group.
4, mud cycling and reutilization method in the sewage treatment process according to claim 3 is characterized in that EM among the described step C comprises Chinese common micro-organisms culture presevation administrative center preservation:
Microbial strains Chinese preserving number
Lactococcus lactis (1.2472)
Pichia membranaefaciens (2.1039)
Candida tropicalis (2.402)
Arthrobacter citreus (1.1893)
Skin shape trichosporon (2.571)
Acetobacter aceti (1.93)
Colloid bacillus cereus (1.153)
Pseudomonas fluorescens (1.219)
Plant lactobacillus (1.124)
Crooked pseudomonas (1.42)
Geotrichum candidum (2.361)
Carbon black aspergillus (3.285)
Aspergillus niger (3.86)
Rhizopus arrhizus (3.2896)
Pseudomonas putida (1.593)
Candida utilis (2.1005)
Blown-ball Azotobacter (1.175)
Aztobacter sp (1.178)
Rhizobium leguminosarum (1.168)
Sinorhizobium meliloti (1.161)
Galega officinalis L root nodule bacterium (1.82)
Zhizopchin (3.1149)
Rhizopus oryzae (3.851)
Bacillus megaterium (1.234)
Tabin aspergillus (3.3161).
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|---|---|---|---|
| CNB2007100422554A CN100522852C (en) | 2007-06-20 | 2007-06-20 | Method for circulating and reutilizing sludge during process of sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100422554A CN100522852C (en) | 2007-06-20 | 2007-06-20 | Method for circulating and reutilizing sludge during process of sewage |
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| Publication Number | Publication Date |
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| CN101074142A true CN101074142A (en) | 2007-11-21 |
| CN100522852C CN100522852C (en) | 2009-08-05 |
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|---|---|---|---|
| CNB2007100422554A Expired - Fee Related CN100522852C (en) | 2007-06-20 | 2007-06-20 | Method for circulating and reutilizing sludge during process of sewage |
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