CN106316050A - Method for improving dryness of biomass sludge - Google Patents
Method for improving dryness of biomass sludge Download PDFInfo
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- CN106316050A CN106316050A CN201610898906.9A CN201610898906A CN106316050A CN 106316050 A CN106316050 A CN 106316050A CN 201610898906 A CN201610898906 A CN 201610898906A CN 106316050 A CN106316050 A CN 106316050A
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- mud
- sludge
- biomass sludge
- dryness fraction
- mass dryness
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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
- C02F11/12—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
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
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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
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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
- C02F11/02—Biological treatment
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of sludge treatment, and in particular relates to a method for improving the dryness of biomass sludge. The method comprises the following steps: adding a crushed plant material and cellulose mud into the biomass sludge to perform tempering on the biomass sludge; then adding a polyacrylamide cation solution to perform flocculation on the biomass sludge after mixing; and finally, performing spiral dehydration. The treatment method of the biomass sludge, provided by the invention, aims at the situation that the running frequency of a single-screw press dehydrator needs to be reduced to improve the dryness of discharged sludge when the sludge contains a low content of fiber or no fiber. As everyone knows, light straw ashes are treated as leftovers, and by using crushed structures and properties of plants, the sludge after flocculation can be gathered together more easily, and the friction force of the sludge after pre-dehydration in the single-screw press dehydrator is increased.
Description
Technical field
The invention belongs to technical field of sludge treatment, be specifically related to a kind of method improving biomass sludge mass dryness fraction.
Background technology
Producing substantial amounts of mud in the industries such as biomass resource comprehensive utilization and papermaking, the existence of these mud is given raw
State environment brings great burden.To this end, country has also put into effect a series of policy, planning promotes and promotes China's Treatment of Sludge skill
Art and the industrialization of technique and the marketization.Treatment of Sludge will increasingly come into one's own, and be expected to enter quickly increasing under policy promotes
The long stage.
Generally, the process of mud includes precipitation, gravity concentration, is dehydrated, is dried etc. and to process.Afterwards, dry mud is entered
One step carries out harmless treatment.In thickening so that in terms of sludge reduction, according to statistics, the mud of about 80% is de-by concentrating
Water processes, and reaches a certain degree of minimizing.Wherein, mechanical sludge dewatering, such as taking off by spiral pressing dehydrator
Water is the topmost technological means that current thickening realizes minimizing.
But, in the technique by spiral biomass sludge dewaterer thickening, have the disadvantage in that and 1. reduce
Spiral biomass sludge dewaterer running frequency improves mud extraction mass dryness fraction, does not often reach technic index 35%, and mass dryness fraction can only carry
High to 30%；2. the reduction of running frequency, causes spiral biomass sludge dewaterer operational efficiency poor, it is impossible to meet normal raw
Produce；3. mud extraction mass dryness fraction less than 35% time, run vehicle handling mud time be easily generated sewage and drip be sprinkled upon road surface, cause working environment
Poor hygienic.Therefore, prior art yet suffers from the deficiencies such as mud extraction mass dryness fraction is low, processing cost is high, inefficiency, it is impossible to meet joint
The demand that energy property economy is growing.
Summary of the invention
It is an object of the invention to provide a kind of method improving biomass sludge mass dryness fraction, with plant comminution of material and cellulose
Mud is added in non-dewatered sludge, for improving the fiber content in non-dewatered sludge, can be effectively improved doing after sludge dewatering
Degree and equipment operating efficiency.
The method of raising biomass sludge mass dryness fraction of the present invention, step is as follows:
(1) in biomass sludge, add plant comminution of material and cellulose mud to carry out biomass sludge quenched；
(2) biomass sludge flocculation is carried out after being subsequently adding the mixing of polyacrylamide cationic solution；
(3) the most spirally it is dehydrated, to obtain final product.
The water content of the biomass sludge described in step (1) is 80-99wt%.
Plant comminution of material described in step (1) is corn stalk, wheat-straw, barley-straw, corn stalk, phragmites communis stalk, Caulis et Folium Lini
One or more in stem, weeds, corn shell, wheat bran, beans straw, Cotton Stalk or potato class seedling.
The addition of the plant comminution of material described in step (1) is 10-600kg, in terms of the weight of over dry mud per ton.
The moisture of the plant comminution of material described in step (1) is less than 30wt%.
In cellulose mud described in step (1), content of cellulose is 40-60wt%, and water content is 30-50wt%, ash
Content is 1-10wt%.
The addition of the cellulose mud described in step (1) is 10-100kg, in terms of the weight of over dry mud per ton.
The concentration of the polyacrylamide cationic solution described in step (2) is 0.05-0.2wt%.
Polyacrylamide cationic solution described in step (2) is 0.1-0.3:1 with the volume ratio of biomass sludge.
Spiral dehydration described in step (3) is first Double helix predrainage, then single-screw press dewatering.
In long-term working practice, the inventors discovered that, spiral biomass sludge dewaterer thickening efficiency is low
Under main reason is that, in current mud fiber content relatively low even without so that the friction between mud and machine is relatively
Little, thus the running frequency of spiral biomass sludge dewaterer reduces, and can not well improve mud extraction mass dryness fraction.The present inventor
It has furthermore been found that be added in non-dewatered sludge with plant comminution of material and cellulose mud, for improving in non-dewatered sludge
Fiber content, can be effectively improved the mass dryness fraction after sludge dewatering and equipment operating efficiency.
Described biomass sludge refer to obtain after biomass resource processes by organic relic, microorganism, inorganic
The extremely complex heterogeneous body of the composition such as granule, colloid, its key property is that moisture content is high (usually 80% to 99%), has
Machine thing content is high, and easily corruption is smelly, and granule is relatively thin, and proportion is less, jelly liquid.It is between liquid and solid it
Between concentrated thing, can transport with pump, but it be difficult to carry out solid-liquid separation by sedimentation.Sewage treatment process three phases, in advance
Processing stage sink pond one and produce preliminary sludge, the biochemical treatment stage produces residual active sludge, advanced treating rank at second pond
Duan San sink pond produce chemical sludge.These mud are mainly made up of organic relic, microorganism, inorganic particle, colloid etc.
Extremely complex heterogeneous body.
Described biomass sludge include raw sewage, through precipitation mud or biochemical treatment after mud.It addition, biomass
The mud that the preferred above-mentioned mud of mud obtains through biochemical treatment.The biomass sludge of the present invention is generally of 80wt% with up to
The moisture of below 99wt%, gross weight based on mud.It is known in the art that the solid component content as mud and composition can be because of
Raw material sources and processing mode are different and different, but these content and composition do not interfere with technical solution of the present invention enforcement and
The realization of invention effect.
Described preliminary sludge refers to that float in hemicellulose liquid sinks, one, the mud that pond (or preliminary sedimentation tank) precipitation produces,
Mainly be made up of (cellulose, hemicellulose and lignin) wood fibre, organic C (carbon) content about 40%, C/N (carbon/
Nitrogen) intermediate value of ratio is about 300, and total nitrogen content is 0.002%～0.5% (dry weight).
Described residual active sludge refers to the anaerobism that hemicellulose liquid occurs anaerobic reaction to produce in the biochemical treatment stage
The aerobic activated sludge that activated sludge (being sometimes referred to as " granule sludge " herein) and aerobic reaction produce, mainly by Organic substance
Composition (micropopulation, microbial metabolic products, the Organic substance that can not be degraded by microorganisms), N, P (nitrogen, phosphorus) content is higher.
Water reuse chemical method after described chemical sludge refers to biochemical treatment removes the dirt being difficult to be biodegradable
The mud produced during dye thing, is mainly formed (iron salt, DIC) by inorganic matter, because water purification to be added in advanced treating
Agent (main component bodied ferric sulfate) or Fenton reagent (main component sulfur acid ferrous iron, hydrogen peroxide), to promote the change of pollutant
Learn reaction.
Described cellulose mud be three element separate after obtain rich in organic mud.The solid that lignin stock solution contains
Thing (small cellulose, i.e. pulping) adds calcium hydroxide precipitation in separating at three grades and filters squeezing, obtains cellulose mud cake；Half is fine
The solid content (small cellulose, i.e. pulping) that dimension liquid contains filters through Microfilter at Waste Water Treatment, obtains cellulose filter
Slag.After cellulose mud cake and the mixing of cellulose filtering residue, it is cellulose mud.
From the angle of comprehensive utilization of resources, as leftover bits and pieces during described plant comminution of material preferred straw cutting process
Straw light ash.Straw light ash is that the particle diameter length graininess less than 10mm is unqualified, and size shape differs, for a long time by as useless
Material processes, even if or be recovered and be also used merely as pellet or be fertilizer for further processing, entirely without from
The angle of comprehensive utilization is added in mud be used for improving mud mass dryness fraction.Therefore, the present invention has unforeseeable effect.
The moisture of plant comminution of material is less than 30wt%, such as, less than 25wt%, 20wt% or 10wt%, even more
Low such as, 5wt%, 3wt% or 1wt%.Shape as plant comminution of material is not particularly limited, can be rod-short, lamellar,
Granular, powder, or the combination etc. of these shapes.In the case of particles, its mean diameter is less than 20mm, preferably smaller than
10mm, more preferably less than 8mm, also preferably less than 6mm, such as 5mm, 3mm etc..If mean diameter is excessive, then it is unfavorable for mud
Extrusion.This is because fibrous material is long is unfavorable for that fiber passes through dewaterer, cause machine power consumption excessive.On the other hand, as
The mean diameter of fruit granule is too small, it is impossible to form enough frictional force, for the reduction of running frequency and carrying of mud extraction mass dryness fraction
Height is disadvantageous.Preferably, the mean diameter of described granule is 4mm to 10mm, and the longest particle diameter is below 30mm.
The biomass sludge mass dryness fraction obtained after single-screw press dewatering is more than 35wt%.
Those skilled in the art respectively can form because of biomass sludge and the difference of content and suitably adjust plant pulverize material
Material and the addition of cellulose mud, its addition is weight based on over dry mud per ton and carries out.This addition (or add
Amount) it is that mud (i.e. entering the mud in modulation pond from the concentration basin) concentration according to mud modulation pond calculates, sludge concentration is exactly
The content of solids in mud.Over dry mud is mud gained after drying time ＞ 2h at electric heating constant-temperature blowing drying box 105 DEG C
Solids.
Preliminary sedimentation tank settling step for the free sedimentation of mud, the sedimentation time be 1 hour with less than up to 2.5 hours.Two
Heavy pond settling step for the stratification precipitation of mud and compression precipitating, the sedimentation time be usually 2 hours with less than up to 5 hours,
Preferably 3 hours with up to 4 hours, such as 3.5 hours.Sludge concentration tank settling step concentrates sewage for the mode of gravitational settling
The various mud that processing system produces, and by sludge pumping to sludge dewatering system.Quenched concentration step is used for making biomass
Mud mix homogeneously, it is ensured that the continuous and steady operation of sludge dewatering system.Flocculation step in flocculation tank by biomass sludge and
The mixing of polyacrylamide cationic solution, stirring produce flocculation.
Use Double helix pre-concentration machine that mud predrainage after flocculation is allowed to mud extraction mass dryness fraction ＞ 10%.Use single-screw squeezes
Mud after predrainage is improved mass dryness fraction by dewaterer further, it is ensured that mud mass dryness fraction ＞ 32% that sludge dewatering system transports, excellent
Select ＞ 35%.
By single-screw squeezing dewatering machine, such as single axle helical squeezing dewatering machine or double-shaft spiral squeezing dewatering machine carry out spiral shell
Spinning squeezes dehydration.Spiral pressing dehydrator can use any spiral pressing dehydrator sold in the market.Work as mud extraction
Mass dryness fraction ＜ 32%, adds plant comminution of material in the quenched pond of mud, and such as straw light ash, stirs 10 to 100 minutes, and preferably 30
Minute mix homogeneously, dosage is adjusted according to mud extraction mass dryness fraction that (in over dry mud per ton, straw light ash weight content is 10%
To 20%, such as 16%).Starting sludge dewatering delivery pump and dosing pump, mud sends into flocculation tank, enters double spiral shell after flocculation
Rotation thickener, subsequently enters single-screw squeezing dewatering machine, and single-screw squeezing dewatering machine running frequency typically requires ＞ 30Hz.
From the point of view of operational effect, straw light ash adds the quenched pond of mud by a certain percentage, does not affect sludge flocculation effect,
On Double helix pre-concentration machine predrainage also without impact, it is possible to be effectively increased fiber content in mud, improve mud at single spiral shell
Frictional force in rotation squeezing dewatering machine.Thus ensure that sludge dewatering system efficient stable runs, and mud mass dryness fraction ＞ 32% of outward transport, keep away
When exempting to load and unload mud, generation sewage drips and is sprinkled upon road surface effect environmental health.Straw light ash itself is waste material disposal, existing as carrying
High mud mass dryness fraction uses, and reduces individual processing expense.
Polyacrylamide cationic solution concentration 0.05-0.2wt%, addition is by production operation situation (non-dewatered sludge
Fiber content in concentration, non-dewatered sludge) determine, usual polyacrylamide cationic solution concentration in the case of 0.2wt%,
Non-dewatered sludge and polyacrylamide cationic solution addition volume ratio 1:0.1-0.3.Additionally general polyacrylamide sun from
Sub-solid addition is based on over dry mud 5kg-15kg per ton；In non-dewatered sludge, fiber content is high, and relative usage is low；It is not dehydrated dirt
Mud concentration is low, and relative usage is low.Polyacrylamide cationic solution is normally used solution in can using this area.Such as, river
The model that the vast Science and Technology Co., Ltd. of Su Fu produces is: the product etc. of the clear 3810DF of Rui Lishui.
The biomass sludge mass dryness fraction obtained after single-screw press dewatering is more than 32wt%.In the prior art, reduce
Single-screw squeezing dewatering machine running frequency improves mud extraction mass dryness fraction, does not often reach technic index 35wt%, and mass dryness fraction can only bring up to
25wt%.The biomass sludge mass dryness fraction that the method for the present invention obtains is more than 35wt%.
The present invention compared with prior art, has the advantages that
When the processing method of the biomass sludge of the present invention is low for fiber content in mud or does not has, single-screw need to be reduced
Squeezing dewatering machine running frequency improves mud extraction mass dryness fraction, it is well known that straw light ash is as waste material disposal, utilizes plant to pulverize
Structure and performance, be more easy to get together by the mud after flocculation, and after increasing predrainage mud in single-screw squeezing dewatering machine
Frictional force.Owing to the frictional force between mud and machine increases, therefore single-screw squeezing dewatering machine running frequency also should strengthen, and one
Being prevention mud and axle locking, two are to increase machine operational efficiency.
Now utilize cellulose mud fiber content high and the big feature of viscosity, add it in non-dewatered sludge, the most reasonable
Utilize, be not only effectively improved sludge flocculation effect, reduce flocculant (polyacrylamide) drug dosage that the market price is expensive,
And reduce individual processing expense.It addition, make the biomass sludge after final dewatering, when being used for preparing biomass fuel, more have
Being beneficial to molding, calorific value substantially increases simultaneously.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
(1) in biomass sludge, add plant comminution of material and cellulose mud to carry out biomass sludge quenched；
(2) biomass sludge flocculation is carried out after being subsequently adding the mixing of polyacrylamide cationic solution；
(3) last first Double helix predrainage processes, then single-screw press dewatering processes, and to obtain final product.
In step (1), the addition of plant comminution of material is 300kg, in terms of the weight of over dry mud per ton.
In step (1), the addition of cellulose mud is 50kg, in terms of the weight of over dry mud per ton.
Embodiment 2
(1) in biomass sludge, add plant comminution of material and cellulose mud to carry out biomass sludge quenched；
(2) biomass sludge flocculation is carried out after being subsequently adding the mixing of polyacrylamide cationic solution；
(3) last first Double helix predrainage processes, then single-screw press dewatering processes, and to obtain final product.
In step (1), the addition of plant comminution of material is 10kg, in terms of the weight of over dry mud per ton.
In step (1), the addition of cellulose mud is 10kg, in terms of the weight of over dry mud per ton.
Embodiment 3
(1) in biomass sludge, add plant comminution of material and cellulose mud to carry out biomass sludge quenched；
(2) biomass sludge flocculation is carried out after being subsequently adding the mixing of polyacrylamide cationic solution；
(3) last first Double helix predrainage processes, then single-screw press dewatering processes, and to obtain final product.
In step (1), the addition of plant comminution of material is 600kg, in terms of the weight of over dry mud per ton.
In step (1), the addition of cellulose mud is 100kg, in terms of the weight of over dry mud per ton.
Concrete operation step is as follows:
1, the quenched pond of mud: build position in sludge dewatering machine room Stall, the long 4m of specification × wide 4m × high 3.5m, surface
Diameter 1.5m circular hole is left in second floor position.Mud quenched pond agitator machinery frame, frequency control, design speed 5rpm is raw
Material sludge retention time is more than 1h, sludge flocculation jar agitator mechanical agitation type, frequency control, design speed 30rpm, biology
Matter sludge and the flocculant mixing time of staying are more than 8min.
2, sludge dewatering delivery pump power 7.5kW, flow 70m3/ h, lift 22m, frequency control；Cationic PAM (producer:
Jiangsu Feymer Technology Co., Ltd., the clear 3810DF of model: Rui Lishui) dosing pump power 3kW, flow 8m3/ h, lift 60m,
Frequency control.
3, cationic PAM (polyacrylamide) dispensing slot format diameter 2m, highly 2m；Sludge flocculation tank format diameter
1.53m, highly 2.2m.
4, Double helix pre-concentration machine format diameter 0.65m, length 6m, frequency control；Single-screw squeezing dewatering machine specification is straight
Footpath 1m, length 10m；Rubber conveyer width 0.65m, length 9m, frequency control.
5, the index of straw light ash: moisture ＜ 30%, particle diameter length ＜ 10mm；It is dense that quenched pond mud sent into by sludge concentration tank
Degree ＞ 5%；Polyacrylamide cationic solution concentration 2 ‰.
6, when mud quenched pond sludge quantity only has 15%, straw is added in right amount according to single-screw squeezing dewatering machine mud extraction mass dryness fraction
Light ash (wheat-straw, mean diameter 5mm, the longest particle diameter 20mm) and cellulose mud (moisture 35%, cellulose 60%, ash 5%),
Dosage such as table 1 dewatering technology of mud service data.After having added, enter mud to liquid level from sludge concentration tank to the quenched pond of mud
50%, opening agitator stirring 30 minutes can starting device.
Table 1 dewatering technology of mud service data
7, single-screw squeezing dewatering machine running frequency with process mud quenched pond sludge quantity relation, be shown in Table 2 device frequencies with
Process sludge quantity relation.
Table 2 device frequency and process sludge quantity relation
8, sludge dewatering start runs:
(1) mud operative employee checks before completing to start shooting and prepares, and controls that to open Double helix successively pre-in mud operative employee notice
Thickener, shower water, filter gauze cleaning pump, sludge flocculation jar agitator, sludge dewatering delivery pump, cationic PAM dosing pump.
(2) Double helix pre-concentration machine starts to single-screw squeezing dewatering machine feed bin (feed bin railway carriage or compartment type structure, degree of depth 260cm, length
Degree 100cm, width 95cm.) enter mud, notice is controlled and opens 2# rubber conveyer, 1# rubber conveyer, screw press dehydration successively
Machine.
(3) if single-screw squeezing dewatering machine mud extraction mass dryness fraction does not meets technic index (mass dryness fraction ＜ 35%), then table 1 is pressed to mud
After quenched pond adds appropriate straw light ash and cellulose mud, stirring can start shooting for 30 minutes continues to run with.
Before and after adding straw light ash and cellulose mud from the point of view of service data contrast, not only improve single-screw squeezing dewatering machine
Mud extraction mass dryness fraction (more than 35%), and due to the quickening of equipment running frequency, processing sludge quantity per hour is also increased.In conjunction with
Add in mud with rational proportion for practical operation situation, make the operational efficiency of sludge dewatering system improve further.
The straw light ash utilizing different mean diameter has carried out following experiment, it is evident that mean diameter be 5mm and
During 10mm, the increasing degree of maximum frequency of operation is bigger compared with during 1mm and 30mm.Dewatering technology of mud service data and straw light ash
The relation of (Semen Tritici aestivi) mean diameter is shown in Table 3.
The relation of table 3 dewatering technology of mud service data (Semen Tritici aestivi) mean diameter grey with straw light
* in the case of test specimen is chosen at and does not adds straw light ash, single-screw squeezing dewatering machine mud extraction mass dryness fraction 31%-35%
Biomass sludge.
Over dry mud straw light ash dosage 90 (kg) the most per ton.
Claims (10)
1. the method improving biomass sludge mass dryness fraction, it is characterised in that step is as follows:
(1) in biomass sludge, add plant comminution of material and cellulose mud to carry out biomass sludge quenched；
(2) biomass sludge flocculation is carried out after being subsequently adding the mixing of polyacrylamide cationic solution；
(3) the most spirally it is dehydrated, to obtain final product.
The method of raising biomass sludge mass dryness fraction the most according to claim 1, it is characterised in that the life described in step (1)
The water content of material mud is 80-99wt%.
The method of raising biomass sludge mass dryness fraction the most according to claim 1, it is characterised in that planting described in step (1)
Thing comminution of material is corn stalk, wheat-straw, barley-straw, corn stalk, phragmites communis stalk, Caulis et Folium Lini stem, weeds, corn shell, wheat bran, beans straw
One or more in stalk, Cotton Stalk or potato class seedling.
The method of raising biomass sludge mass dryness fraction the most according to claim 1, it is characterised in that planting described in step (1)
The addition of thing comminution of material is 10-600kg, in terms of the weight of over dry mud per ton.
The method of raising biomass sludge mass dryness fraction the most according to claim 1, it is characterised in that planting described in step (1)
The moisture of thing comminution of material is less than 30wt%.
The method of raising biomass sludge mass dryness fraction the most according to claim 1, it is characterised in that the fibre described in step (1)
In dimension element mud, content of cellulose is 40-60wt%, and water content is 30-50wt%, and content of ashes is 1-10wt%.
The method of raising biomass sludge mass dryness fraction the most according to claim 1, it is characterised in that the fibre described in step (1)
The addition of dimension element mud is 10-100kg, in terms of the weight of over dry mud per ton.
The method of raising biomass sludge mass dryness fraction the most according to claim 1, it is characterised in that gathering described in step (2)
The concentration of acrylamide cationic solution is 0.05-0.2wt%.
The method of raising biomass sludge mass dryness fraction the most according to claim 1, it is characterised in that gathering described in step (2)
Acrylamide cationic solution is 0.1-0.3:1 with the volume ratio of biomass sludge.
The method of raising biomass sludge mass dryness fraction the most according to claim 1, it is characterised in that described in step (3)
Spiral dehydration is first Double helix predrainage, then single-screw press dewatering.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108689567A (en) * | 2017-04-05 | 2018-10-23 | 沈阳绿色环保能源科技有限公司 | Hydraulic biomass filtrate sludge dewatering equipment |
| CN113967390A (en) * | 2021-10-27 | 2022-01-25 | 李亚龙 | Preparation device and preparation method of soil conditioner |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109942079A (en) * | 2019-03-20 | 2019-06-28 | 上海交通大学 | A kind of aerobic particle mud fast preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113967390A (en) * | 2021-10-27 | 2022-01-25 | 李亚龙 | Preparation device and preparation method of soil conditioner |
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| CN106316050B (en) | 2019-11-05 |
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