CN109305745A - A kind of method of cow dung deep dehydration - Google Patents
A kind of method of cow dung deep dehydration Download PDFInfo
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- CN109305745A CN109305745A CN201811399187.1A CN201811399187A CN109305745A CN 109305745 A CN109305745 A CN 109305745A CN 201811399187 A CN201811399187 A CN 201811399187A CN 109305745 A CN109305745 A CN 109305745A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
Abstract
The present invention provides a kind of method of cow dung deep dehydration, including oxidant is added into fresh cow dung, carries out hydro-thermal reaction processing after mixing evenly；Hydro-thermal reaction treated cow dung is mixed and stirred for water；Most the processing to fresh cow dung is completed through filter press filter-press dehydration afterwards.The present invention uses hydro-thermal reaction processing technique, the capillary water for being difficult to slough in fresh cow dung is become feasible into the bulk water removed with absorption water, so that the degree of dehydration of fresh cow dung is high, the total nitrogen recovery and total phosphorous recovery of fresh cow dung are high after present invention processing, be conducive to resource utilization, be also prevented from and cause water eutrophication.Small investment needed for the method for the present invention simple process, easy to operate, equipment, and operation cost is lower, dewatering time is short, and dehydrating effect is good, and Degradation of Antibiotics is high-efficient, is convenient for large-scale industrial production.
Description
Technical field
The present invention relates to livestocks faces processing method fields, and in particular to a kind of method of cow dung deep dehydration.
Background technique
In beef cattle production, cow dung usually makees waste disposal, and processing generates huge expense.Cattle farm cow dung is managed
Purpose be the health for promoting ox and the efficiency of feed utilization and rate of body weight gain that improve ox, prevent cow dung to the pollution of environment (to water,
The pollution in soil and atmosphere), the remaining nutriment in cow dung is efficiently used, can eat up nearly l tons in life and be in beef cattle
To more feeds.These feed a part are converted into the bodily tissue of beef cattle, and a part is changed into cow dung (including excrement and urine).
In cowshed 2 tons of cow dungs are at least discharged, wherein the quantity of excrement and urine is almost equal in beef cattle.There is researcher's specific determination ox
The beef cattle of the weight of excrement, average l 450Kg weight can produce the cow dung (including excrement and urine) of 23Kg daily in cowshed.This number
Word can float up and down 25% according to the cattle breeds of raising, type, the difference of amount of drinking water and local climate of fed daily ration.One
As for, the cow dung that 1 ox generates daily is the 5%~6% of Niu Tichong.This weight is 1 ox eaten feed relative daily
2 times of (about the 3% of Niu Tichong), cow dung why environment can be impacted be exactly because feed in nutritional ingredient simultaneously
It cannot be absorbed completely by the alimentary canal of ox.Therefore, cow dung has enough nutriments and energy to support worm's ovum, generate foul smell
Microorganism, and consume the oxygen in water.If the excrement of cattle farm is dealt with improperly, very big pollution can be caused to environment.Ox
Excrement is mainly reflected in the pollution of environment: pollution, pollution to air, pollution to soil and cow dung of the cow dung to cleaning water source
Breed a large amount of pests such as fly etc..Cow dung is mainly summer rainfall or the snow melt in winter the dirt for having cow dung to the pollution at water source
Water is washed into clean water source.This sewage can consume the oxygen dissolved in water, lead to water fish class and plant anoxic and dead.
In large-scale animal husbandry, antibiotic be widely used in prevent Animal diseases and promote livestock and poultry growth and
Feeding efficiency is improved, antibiotic is largely used to aquaculture, about 75% or so with asian treatment dosage to treat for a long time
Antibiotic cannot be absorbed by animal, remain on excrement, and as excrement enters in surrounding medium, so that soil is especially agriculture
Planting soil becomes the huge repository of veterinary antibiotic, as the appearance of " superbacteria " and its huge health of bring are endangered
Evil, people gradually pollute the resistant gene that the sight of concern invests antibiotic, and cause to residual antibiotic ring in environment
The concern of border behavior, up to several hundred ppm single antibiotic pollutions can be detected in oneself in agricultural soil, consider various pollutions in soil
Object collects characteristic, and the cumulative concentration of Multiple Classes of Antibiotics will be very surprising.Antibiotic in feces of livestock and poultry is broadly divided into four
Ring chlorins compound and carbostyril compound, wherein tetracycline antibiotics are widely used in the prevention and treatment of infectious disease and promote dynamic
The food additives of object growth.In China, for additive for farm animal feed every year up to 100~1,500,000 tons, the annual antibiotic in China is total
(about 9.7 ten thousand tons) of 46.1% measured are used for animal husbandry.Since antibiotic metabolic rate is low, 10~40% are typically only, so,
Most of antibiotic can be discharged into environment with excrement.But a large amount of antibiotic therein can remain in feces of livestock and poultry, and processing is not
When very serious pollution can be caused to soil and water body, therefore, it is necessary to degrade to the antibiotic in feces of livestock and poultry.
In recent years, livestock and poultry breeding industry intensive degree is continuously improved, and feces of livestock and poultry yield also rises year by year, this makes livestock and poultry
Contradiction between excrement and environment gradually highlights, the adverse effect that feces of livestock and poultry generates water body, soil and atmospheric environment by
Concern.The moisture content of feces of livestock and poultry is very high, and the water content of fresh cow dung is up to 70~85%, and China requires graininess biological organic
Fertile moisture content is not more than 15%, and the optimal initial aqueous rate of compost is 50~65%, the moisture content of the feces of livestock and poultry as burning
No more than 20%, and the moisture content of fresh cow dung is very high is unfavorable for subsequent transportation and final disposal.From the foregoing, it will be observed that reducing aqueous
Rate is the key that livestock and poultry dung recovery utilizes.
Feces of livestock and poultry is by indigested feed nutrient, interior metabolism product, gastrointestinal mucosal, secretion, the micro- life of enteron aisle
Object and its decomposition product etc. collectively constitute.These substances make the moisture of feces of livestock and poultry with the absorption water of hardly possible removal, capillary water
Based on, the bulk water ratio easily removed is few.How to destroy the water storage structure in feces of livestock and poultry, will be not easy the absorption water removed,
The bulk water that capillary water switchs to easily remove is the emphasis for reducing feces of livestock and poultry moisture content.
At home and abroad, the method that fowl and animal excrement dehydration uses mainly has high temperature and rapid drying, biologically dehydrating and mechanical dehydration.
Compared with thermal dehydration mode and biologically dehydrating, the energy consumption of mechanical presses is relatively low, and the period is short.Therefore, mechanical dehydration
It is widely used in being dehydrated.In the prior art, although popular solid-liquid separator of poultry excrement solid portion after separation of solid and liquid
Moisture content is below 60%, but the solid recovery rate of solid-liquid separating machine is not high (being below 30%), and total nitrogen, total phosphorous recovery are more
It is low.This will cause the waste of resource, greatly increase later period sewage treatment expense, aggravate the influence to environment.
It is in recent years, domestic that there are also the methods of patent report fowl and animal excrement dehydration, such as:
1, " compost method that a kind of pair of feces of livestock and poultry carries out biologically dehydrating " (application number: patent 201010104194.1)
It is middle pig manure is divided feces of livestock and poultry in the case where adding bio-fermentation agents after addition fly maggot carry out fermentation process so that ox
Moisture content in excrement drops to the degree for capableing of compost treatment.This method period is long, and dehydration could be completed by 7~12 days.Therefore
Infrastructure investment is big, and occupied ground is also big, is not suitable for large-scale industrial production.
2, " a kind of decontamination of human excreta recycling processing method " (application number: with pumping in patent 201210251613.3)
In liquid manure to flocculation reaction tank, flocculating polymer medicament is added and carries out flocculation reaction, the liquid manure after flocculation is in dewaterer through spiral shell
Rotation squeezes the excrement slag for isolating tiny solid object and colloidal particulate content, and filtrate, which enters, gathers chelating processing.Wadding is added in this method
Dehydration is merely able to improve rate of water loss and cannot improve degree of dehydration after solidifying agent, therefore the moisture content of dewatered feces of livestock and poultry is still
Very high, the excrement of high-moisture is unfavorable for late resourceization utilization.
3, the patent of " processing method of cow dung " (application number: CN201710912812.7) discloses a kind of processing of cow dung
Method comprising following steps: (1) pre-dehydration: it is 50~60% that cow dung, which is dehydrated to percent water,；(2) pre fermentation: to
Pre fermentation after bacillus mycoides and hay bacillus is added in cow dung；(3) ingredient: into fermentor add Chinese medicine dreg, lime,
It is mixed evenly after the auxiliary material of mushroom bran composition；(5) main fermentation: into fermentor, addition is dropped by cellulose-degrading bacteria, xylan
Main fermentation is carried out after the fermenting agent that solution bacterium, EM bacterium form；(6) dry: the percent water using infrared drying to cow dung contains
Amount is 5~10%.The product that cow dung processing method of the invention obtains can be directly used for the cultivation of edible mushroom, processing method letter
Just, high-efficient, practical.
Summary of the invention
The technical problem to be solved by the present invention is to be unfavorable for subsequent transportation and final place for fresh cow dung moisture content is very high
It sets and a kind of solid recovery rate for providing is high, degree of dehydration is high, low energy consumption, the method for cow dung deep dehydration at low cost.
A kind of method of cow dung deep dehydration, includes the following steps:
Step 1: a certain amount of oxidant is added into fresh cow dung, hydro-thermal reaction is carried out after mixing evenly and handles one section
The reaction temperature of time, the hydro-thermal reaction processing are 110~150 DEG C；
Step 2: hydro-thermal reaction treated cow dung is mixed and stirred for water；
Step 3: being completed de- to the depth of fresh cow dung by step 2 treated cow dung through filter press filter-press dehydration
Water.
Further, the time of the processing of hydro-thermal reaction described in the step 1 is 30~60min.
Further, the amount that the oxidant is added in the butt in the step 1 by cow dung described in every kilogram is 0.15
~0.3mol.
Further, oxidant described in the step 1 is one of hydrogen peroxide, potassium peroxydisulfate and sodium peroxydisulfate
Or several mixture.
Further, moisture content of the cow dung described in the step 2 after being mixed and stirred for water is adjusted to 90%
More than.
Further, the hole aperture of the filter cloth of filter press described in the step 3 is 30~60 μm.
Further, the filter press is diaphragm filter press, plate and frame filter press or chamber filter press.
Beneficial effects of the present invention
The present invention uses hydro-thermal reaction processing technique, and the capillary water for being difficult to slough in fresh cow dung is become with absorption water
It is easy to the bulk water removed, the capillary water absorbing time of fresh cow dung is substantially reduced, so that the degree of dehydration of fresh cow dung is high, contains
Water rate is only 30~50%, and the volume and weight of fresh cow dung greatly reduces, and significantly reduces subsequent processing cost, and have
Conducive to the subsequent disposition of cow dung.
Suitable quantity of water is added in cow dung after hydro-thermal process of the present invention and is uniformly mixed raising moisture content, filter cloth will not be blocked, had
Conducive to collection part residue and filters pressing effect is improved, using the filter cloth that hole aperture is minimum when being dehydrated using filter press, no
Only speed of filter pressing is fast, and solid recovery rate is up to 90% or more.
Total nitrogen recovery of fresh cow dung is up to 80% or more after present invention processing, and total phosphorous recovery is up to 90% or more,
A large amount of plant nutrient N, P are remained, is conducive to the resource utilization in later period, is also prevented from and causes water eutrophication.
Less oxidant is added in the present invention, and hydro-thermal reaction is handled together, the antibiosis in the fresh cow dung that can effectively degrade
Element.
Small investment needed for the method for the present invention simple process, easy to operate, equipment, and operation cost is lower, dewatering time is short,
Dehydrating effect is good, and Degradation of Antibiotics is high-efficient, is convenient for large-scale industrial production.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is reaction temperature in the embodiment of the present invention 4 to capillary water absorbing time and to the influence curve of antibiotic residual quantity
Figure.
Fig. 2 is the reaction time in the embodiment of the present invention 5 to the influence curve figure of capillary water absorbing time.
Specific embodiment
In order to be more clear the purpose of the present invention, technical solution and advantageous effects, below in conjunction with attached drawing and implementation
Mode, the present invention will be described in further detail.It should be understood that embodiment described in this specification is used for the purpose of
It explains the present invention, is not intended to the limitation present invention, material employed in embodiment and instrument are commercially available, the antibiotic packet
Include Tetracyclines, quinolones, sulfamido and macrolides.
Embodiment 1
A kind of method of cow dung deep dehydration, includes the following steps:
A. hydrogenperoxide steam generator is added in fresh cow dung (initial aqueous rate is 82%), by cow dung butt described in every kilogram
The middle amount that the hydrogen peroxide is added is 0.20mol, is then stirred evenly, and be added in hydro-thermal reaction device, and temperature is adjusted
It is 110 DEG C, sufficiently reaction 30min.
B. it will add water in the cow dung after reacting in step a, moisture content be adjusted to 90%, is mixed and stirred for uniformly.
C. the cow dung obtained after step b is completed into the processing to fresh cow dung, the plate through plate and frame filter press filter-press dehydration
Frame canvas press cloth hole aperture is 30 μm.
The capillary water absorbing time that detected of fresh cow dung before the present embodiment processing is 1405.1s, antibiotic content
87.6mg/kg.It through detection capillary water absorbing time is 106.7s through step a treated cow dung；Complete that treated that cow dung is aqueous
Rate 45%, solid recovery rate 90.2%, total nitrogen recovery 86.3%, total phosphorous recovery 90.6%, antibiotic content 1.03mg/
kg。
Embodiment 2
A kind of method of cow dung deep dehydration, includes the following steps:
A. potassium persulfate solution is added in fresh cow dung (initial aqueous rate is 85%), by cow dung butt described in every kilogram
The middle amount that the potassium peroxydisulfate is added is 0.15mol, is then stirred evenly, and be added in hydro-thermal reaction device, and temperature is adjusted
It is 130 DEG C, sufficiently reaction 50min.
B. it will add water in the cow dung after reacting in step a, moisture content be adjusted to 92%, is mixed and stirred for uniformly.
C. cow dung will be obtained after step b through plate and frame filter press filter-press dehydration, completes the processing to fresh cow dung, the sheet frame
Canvas press cloth hole aperture is 30 μm.
The capillary water absorbing time that detected of fresh cow dung before the present embodiment processing is 1487.9s, antibiotic content
76.23mg/kg.It through detection capillary water absorbing time is 20.1s through step a treated cow dung；Complete that treated that cow dung is aqueous
Rate 37%, solid recovery rate 92.5%, total nitrogen recovery 86.7%, total phosphorous recovery 92.1%, antibiotic content 0.41mg/
kg。
Embodiment 3
A kind of method of cow dung deep dehydration, includes the following steps:
A. sodium peroxydisulfate solution is added in fresh cow dung (initial aqueous rate is 80%), by cow dung butt described in every kilogram
The middle amount that the sodium peroxydisulfate is added is 0.3mol, is then stirred evenly, and be added in hydro-thermal reaction device, adjusts temperature and is
150 DEG C, sufficiently reaction 60min.
B. it will add water in the cow dung after reacting in step a, moisture content be adjusted to 95%, is mixed and stirred for uniformly.
C. cow dung will be obtained after step b through plate and frame filter press filter-press dehydration, completes the processing to fresh cow dung, the sheet frame
Canvas press cloth hole aperture is 40 μm.
The capillary water absorbing time that detected of fresh cow dung before the present embodiment processing is 1245.1s, antibiotic content
69.61mg/kg.It through detection capillary water absorbing time is 13.22s through step a treated cow dung；Complete that treated that cow dung is aqueous
Rate 28%, solid recovery rate 93.1%, total nitrogen recovery 84.5%, total phosphorous recovery 90.7%, antibiotic content is lower than detection
Limit.
Embodiment 4
A kind of method of cow dung deep dehydration, includes the following steps:
A. the mixed solution of potassium peroxydisulfate and sodium peroxydisulfate is added in fresh cow dung (initial aqueous rate is 81%), by every
The amount that the potassium peroxydisulfate and sodium peroxydisulfate are added in kilogram cow dung butt is 0.25mol, is then stirred evenly, and be added
Into hydro-thermal reaction device, adjusting temperature is 70~150 DEG C, sufficiently reaction 30min.
B. it will add water in the cow dung after reacting in step a, moisture content be adjusted to 90%, is mixed and stirred for uniformly.
C. cow dung will be obtained after step b through plate and frame filter press filter-press dehydration, completes the processing to fresh cow dung, the sheet frame
Canvas press cloth hole aperture is 45 μm.
It is 1256.0s, antibiotic content that fresh cow dung before the present embodiment processing, which is detected capillary water absorbing time,
81.20mg/kg.Influence of the hydrothermal temperature to capillary water absorbing time and antibiotic residual quantity such as Fig. 1, it is known that, reaction temperature
At 110~150 DEG C, especially 130~150 DEG C, the capillary water absorbing time of cow dung is shorter, and antibiotic content is lower.When reaction temperature
When degree is 150 DEG C, the capillary water absorbing time of cow dung is 16.7s, and completing that treated, cow dung moisture content is 30%, solid recovery rate
92.6%, total nitrogen recovery 86.3%, total phosphorous recovery 90.8%, antibiotic content 0.32mg/kg.
Embodiment 5
A kind of method of cow dung deep dehydration, includes the following steps:
A. the mixed solution of hydrogen peroxide and sodium peroxydisulfate is added in fresh cow dung (initial aqueous rate is 86%), by every
The amount that the hydrogen peroxide and sodium peroxydisulfate are added in kilogram cow dung butt is 0.25mol, is then stirred evenly, and be added
Into hydro-thermal reaction device, adjusting temperature is 130 DEG C, sufficiently 20~60min of reaction.
B. it will add water in the cow dung after reacting in step a, moisture content be adjusted to 90%, is mixed and stirred for uniformly.
C. cow dung will be obtained after step b through plate and frame filter press filter-press dehydration, completes the processing to fresh cow dung, the sheet frame
Canvas press cloth hole aperture is 60 μm.
The capillary water absorbing time that detected of fresh cow dung before the present embodiment processing is 1501.3s, antibiotic content
68.34mg/kg.Influence of the reaction time to capillary water absorbing time such as Fig. 2, it is known that, reaction time cow dung in 30~60min
Capillary water absorbing time is shorter.When being 30min between when reacted, the capillary water absorbing time of cow dung is 22.5s, ox of completing that treated
Excrement moisture content is 38%, solid recovery rate 92.1%, total nitrogen recovery 84.1%, total phosphorous recovery 93.4%, antibiotic content
0.52mg/kg。
Comparative example 1
A kind of method of cow dung deep dehydration, includes the following steps:
A. hydrogenperoxide steam generator is added in fresh cow dung (initial aqueous rate is 82%), by cow dung butt described in every kilogram
The middle amount that the hydrogen peroxide is added is 0.20mol, then stirs evenly, stands 30min under room temperature.
B. it will add water in the cow dung after reacting in step a, moisture content be adjusted to 90%, is mixed and stirred for uniformly.
C. the cow dung obtained after step b is completed into the processing to fresh cow dung, the plate through plate and frame filter press filter-press dehydration
Frame canvas press cloth hole aperture is 30 μm.
The capillary water absorbing time that detected of fresh cow dung before the present embodiment processing is 1405.1s, antibiotic content
87.6mg/kg.It through detection capillary water absorbing time is 1266.1s, dewatered cow dung moisture content through step a treated cow dung
74%, solid recovery rate 87.8%, total nitrogen recovery 81.3%, total phosphorous recovery 84.1%, antibiotic content 17.12mg/kg.
Comparative example 2
A kind of method of cow dung deep dehydration, includes the following steps:
A. hydrogenperoxide steam generator is added in fresh cow dung (initial aqueous rate is 82%), by cow dung butt described in every kilogram
The middle amount that the hydrogen peroxide is added is 0.20mol, is then stirred evenly, and be added in hydro-thermal reaction device, and temperature is adjusted
It is 90 DEG C, sufficiently reaction 30min.
B. it will add water in the cow dung after reacting in step a, moisture content be adjusted to 90%, is mixed and stirred for uniformly.
C. the cow dung obtained after step b is completed into the processing to fresh cow dung, the plate through plate and frame filter press filter-press dehydration
Frame canvas press cloth hole aperture is 30 μm.
The capillary water absorbing time that detected of fresh cow dung before the present embodiment processing is 1405.1s, antibiotic content
87.6mg/kg.It through detection capillary water absorbing time is 522.6s, dewatered cow dung moisture content through step a treated cow dung
65%, solid recovery rate 89.8%, total nitrogen recovery 81.0%, total phosphorous recovery 85.2%, antibiotic content 10.67mg/kg.
Comparative example 3
A kind of method of cow dung deep dehydration, includes the following steps:
A. fresh cow dung (initial aqueous rate is 82%) is added in hydro-thermal reaction device, adjusting temperature is 130 DEG C, sufficiently
React 30min.
B. it will add water in the cow dung after reacting in step a, moisture content be adjusted to 90%, is mixed and stirred for uniformly.
C. cow dung will be obtained after step b through plate and frame filter press filter-press dehydration, completes the processing to fresh cow dung, the sheet frame
Canvas press cloth hole aperture is 30 μm.
The capillary water absorbing time that detected of fresh cow dung before the present embodiment processing is 1405.1s, antibiotic content
87.6mg/kg.It through detection capillary water absorbing time is 36.7s, dewatered cow dung moisture content through step a treated cow dung
67%, solid recovery rate 86.7%, total nitrogen recovery 80.1%, total phosphorous recovery 83.9%, antibiotic content 22.63mg/kg.
The foregoing describe basic principles and main features of the invention and advantages of the present invention.The technical staff of the industry answers
The understanding, the present invention is not limited to the above embodiments, and the above embodiments and description only describe of the invention
Principle, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these change and change
Into all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent
It defines.
Claims (7)
1. a kind of method of cow dung deep dehydration, which comprises the steps of:
Step 1: a certain amount of oxidant is added into fresh cow dung, hydro-thermal reaction processing a period of time is carried out after mixing evenly,
The reaction temperature of the hydro-thermal reaction processing is 110~150 DEG C；
Step 2: hydro-thermal reaction treated cow dung is mixed and stirred for water；
Step 3: completing the processing to fresh cow dung through filter press filter-press dehydration by step 2 treated cow dung.
2. the method for cow dung deep dehydration according to claim 1, which is characterized in that hydro-thermal reaction described in the step 1
The time of processing is 30~60min.
3. the method for cow dung deep dehydration according to claim 1, which is characterized in that by described in every kilogram in the step 1
The amount that the oxidant is added in the butt of cow dung is 0.15~0.3mol.
4. the method for cow dung deep dehydration according to claim 1, which is characterized in that oxidant described in the step 1 is
The mixture of one or more of hydrogen peroxide, potassium peroxydisulfate and sodium peroxydisulfate.
5. the method for cow dung deep dehydration according to claim 1, which is characterized in that cow dung described in the step 2 is passed through
Moisture content after being mixed and stirred for water is adjusted to 90% or more.
6. the method for cow dung deep dehydration according to claim 1, which is characterized in that filter press described in the step 3
The hole aperture of filter cloth is 30~60 μm.
7. the method for cow dung deep dehydration according to claim 1, which is characterized in that the filter press be diaphragm filter press,
Plate and frame filter press or chamber filter press.
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| CN109722264A (en) * | 2019-03-05 | 2019-05-07 | 重庆大学 | A kind of method of feces of livestock and poultry hydrothermal carbonization recycling phosphorus |
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