CN106316050B - The method for improving biomass sludge mass dryness fraction - Google Patents
The method for improving biomass sludge mass dryness fraction Download PDFInfo
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- CN106316050B CN106316050B CN201610898906.9A CN201610898906A CN106316050B CN 106316050 B CN106316050 B CN 106316050B CN 201610898906 A CN201610898906 A CN 201610898906A CN 106316050 B CN106316050 B CN 106316050B
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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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- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention belongs to technical field of sludge treatment, and in particular to a method of improve biomass sludge mass dryness fraction.Plant comminution of material and cellulose mud are added into biomass sludge, and to carry out biomass sludge quenched, carries out biomass sludge flocculation after the mixing of polyacrylamide cationic solution is then added, finally carry out spiral dehydration to get.The processing method of biomass sludge of the invention for fiber content in sludge it is low or without when, single-screw squeezing dewatering machine running frequency need to be reduced and improve mud extraction mass dryness fraction, it is well-known, straw light ash is as waste material disposal, structure and performance are crushed using plant, sludge after flocculation is easier to get together, and increases sludge frictional force in single-screw squeezing dewatering machine after pre-dehydration.
Description
Technical field
The invention belongs to technical field of sludge treatment, and in particular to a method of improve biomass sludge mass dryness fraction.
Background technique
A large amount of sludge is generated in the industries such as biomass resource comprehensive utilization and papermaking, the presence of these sludge is to life
State environment brings great burden.For this purpose, country has put into effect a series of policies, planning also to push and promote China's Treatment of Sludge skill
The industrialization and the marketization of art and technique.Treatment of Sludge will increasingly be taken seriously, and be expected to enter quickly increasing under policy promotion
The long stage.
In general, the processing of sludge includes the processing such as precipitating, gravity concentration, dehydration, drying.Later, by dry sludge into
One step carries out harmless treatment.In thickening so that in terms of sludge reduction, according to statistics, about 80% sludge is de- by concentration
Water is handled, the minimizing reached a certain level.Wherein, mechanical sludge dewatering, such as pass through the de- of spiral pressing dehydrator
Water is the most important technological means that minimizing is realized in current thickening.
However, having the disadvantage in that and 1. reducing in the technique by spiral biomass sludge dewaterer thickening
Spiral biomass sludge dewaterer running frequency improves mud extraction mass dryness fraction, technic index 35% is often not achieved, mass dryness fraction can only mention
Height is to 30%；2. the reduction of running frequency causes spiral biomass sludge dewaterer operational efficiency poor, is not able to satisfy normal life
It produces；3. mud extraction mass dryness fraction is lower than 35%, operation vehicle is also easy to produce sewage and drips when loading and unloading sludge is sprinkled upon road surface, causes working environment
Poor hygienic.Therefore, the deficiencies of there are still mud extraction mass dryness fraction is low, processing cost is high, inefficiency in the prior art, is not able to satisfy section
It can the increasingly developed demand of property economy.
Summary of the invention
The object of the present invention is to provide a kind of methods for improving biomass sludge mass dryness fraction, with plant comminution of material and cellulose
Mud is added in non-dewatered sludge, dry after can effectively improving sludge dewatering for improving the fiber content in non-dewatered sludge
Degree and equipment operating efficiency.
The method of the present invention for improving biomass sludge mass dryness fraction, steps are as follows:
(1) plant comminution of material is added into biomass sludge and cellulose mud progress biomass sludge is quenched；
(2) biomass sludge flocculation is carried out after the mixing of polyacrylamide cationic solution being then added；
(3) finally carry out spiral dehydration to get.
The water content of biomass sludge described in step (1) is 80-99wt%.
Plant comminution of material described in step (1) is cornstalk, wheat-straw, barley-straw, cereal stalk, reed stalk, flax
One or more of stem, weeds, cereal shell, wheat bran, beans stalk, Cotton Stalk or potato seedling.
The additive amount of plant comminution of material described in step (1) is 10-600kg, with the poidometer of over dry mud per ton.
The moisture of plant comminution of material described in step (1) is less than 30wt%.
Content of cellulose is 40-60wt%, water content 30-50wt%, ash content in cellulose mud described in step (1)
Content is 1-10wt%.
The additive amount of cellulose mud described in step (1) is 10-100kg, with the poidometer of over dry mud per ton.
The concentration of polyacrylamide cationic solution described in step (2) is 0.05-0.2wt%.
The volume ratio of polyacrylamide cationic solution described in step (2) and biomass sludge is 0.1-0.3:1.
Spiral dehydration is first double helix pre-dehydration, then single-screw press dewatering described in step (3).
In long-term working practice, the inventors discovered that, spiral biomass sludge dewaterer thickening low efficiency
The main reason for lower will be, in current sludge fiber content it is lower even without so that friction between sludge and machine compared with
It is small, so that the running frequency of spiral biomass sludge dewaterer reduces, and mud extraction mass dryness fraction cannot be improved well.The present inventor
It has furthermore been found that being added in non-dewatered sludge with plant comminution of material and cellulose mud, for improving in non-dewatered sludge
Fiber content, mass dryness fraction and equipment operating efficiency after sludge dewatering can be effectively improved.
The biomass sludge refer to obtained after biomass resource processing by organic debris, microorganism, inorganic
The extremely complex heterogeneous body of the compositions such as particle, colloid, key property are that moisture content is high (usually 80% to 99%), are had
Machine object content is high, it is smelly to be easy corruption, and particle is thinner, specific gravity is smaller, jelly liquid.It is between liquid and solid it
Between concentrated thing, can with pump transport, but it be difficult by sedimentation be separated by solid-liquid separation.Sewage treatment process three phases, in advance
Processing stage generates preliminary sludge in a heavy pond, and the biochemical treatment stage generates residual active sludge, advanced treating rank in secondary settling tank
The heavy pond Duan San generates chemical sludge.What these sludge were mainly made of organic debris, microorganism, inorganic particle, colloid etc.
Extremely complex heterogeneous body.
The biomass sludge include raw sewage, the sludge through precipitating or biochemical treatment after sludge.In addition, biomass
The preferably above-mentioned sludge of sludge passes through the sludge that biochemical treatment obtains.Biomass sludge of the invention usually have 80wt% with up to
99wt% moisture below, the total weight based on sludge.Known in the art, solid component content and composition as sludge can be because
Raw material sources and processing mode are different and different, but these contents and composition will not influence the implementation and sheet of technical solution of the present invention
The realization of invention effect.
The preliminary sludge refers to the sludge that suspended matter is generated in heavy pond (or primary sedimentation tank) precipitating in hemicellulose liquid,
Mainly be made of (cellulose, hemicellulose and lignin) wood fibre, organic C (carbon) content about 40%, C/N (carbon/
Nitrogen) ratio intermediate value 300 or so, total nitrogen content is 0.002%~0.5% (dry weight).
The residual active sludge refers to that in the biochemical treatment stage anaerobism that anaerobic reaction generates occurs for hemicellulose liquid
The aerobic activated sludge that activated sludge (herein sometimes referred to as " granule sludge ") and aerobic reaction generate, mainly by organic matter
It forms (micropopulation, microbial metabolic products, the organic matter that cannot be degraded by microorganisms), N, P (nitrogen, phosphorus) content is higher.
The chemical sludge refers to that the removal of the water reuse chemical method after biochemical treatment is not easy the dirt being biodegradable
The sludge generated when contaminating object, mainly forms (molysite, inorganic carbon) by inorganic matter, because water purification to be usually 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.
The cellulose mud is the three element sludge obtained after separation rich in organic matter.The solid that lignin stoste contains
Calcium hydroxide precipitation filtering squeezing is added in object (small cellulose, i.e. pulping) in three-level separation, obtains cellulose mud cake；Half fiber
The solid content (small cellulose, i.e. pulping) that dimension liquid contains is filtered in waste water treatment system by Microfilter, obtains cellulose filter
Slag.After cellulose mud cake and the mixing of cellulose filter residue, as cellulose mud.
From the angle of comprehensive utilization of resources, as leftover bits and pieces when the preferred stalk cutting process of the plant comminution of material
Straw light ash.Straw light ash is the graininess powder that partial size length is less than 10mm, and size shape is different, for a long time by as useless
Material processing, or is used merely as pellet being recovered or is processed as fertilizer for further processing, absolutely not from
The angle of comprehensive utilization, which is added in sludge, is used to improve sludge mass dryness fraction.Therefore, the present invention has the effect of unexpected.
The moisture of plant comminution of material is less than 30wt%, for example, being less than 25wt%, 20wt% or 10wt%, even more
It is low for example, 5wt%, 3wt% or 1wt%.Shape as plant comminution of material is not particularly limited, can for rod-short, sheet,
Granular, powder or the combination of these shapes etc..In the case of particles, average grain 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 average grain diameter is excessive, it is unfavorable for sludge
Extrusion.This is because the too long fiber that is unfavorable for of fibrous material causes machine power consumption excessive by dewaterer.On the other hand, such as
The average grain diameter of fruit granule is too small, cannot form enough frictional force, and the reduction and mud extraction mass dryness fraction for running frequency mention
Height is unfavorable.Preferably, the average grain diameter of the particle is 4mm to 10mm, and longest partial size is 30mm or less.
The biomass sludge mass dryness fraction obtained after single-screw press dewatering is greater than 35wt%.
Those skilled in the art can respectively form because of biomass sludge and its appropriate adjustment plant crushes material due to the difference of content
The additive amount of material and cellulose mud, additive amount are the weight based on over dry mud per ton and carry out.The additive amount (or add
Amount) it is sludge (sludge for entering modulation pond from concentration basin) concentration calculation that pond is modulated according to sludge, sludge concentration is exactly
The content of solids in sludge.Over dry mud be sludge at 105 DEG C of electric heating constant-temperature blowing drying box after drying time > 2h gained
Solids.
Primary sedimentation tank settling step is used for the free sedimentation of sludge, and the sedimentation time is 1 hour up to 2.5 hours or less.Two
Stratification precipitating and compression precipitating of the heavy pond settling step for sludge, the sedimentation time be usually 2 hours with up to 5 hours hereinafter,
It is preferred that 3 hours with up to 4 hours, such as 3.5 hours.Sewage is concentrated in mode of the sludge concentration tank settling step for gravitational settling
The various sludge that processing system generates, and pass through sludge pumping to sludge dewatering system.Quenched concentration step is for making biomass
Sludge is uniformly mixed, and guarantees 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 generate flocculation.
Mud extraction mass dryness fraction > 10% is allowed to sludge pre-dehydration after flocculation using double helix pre-concentration machine.It is squeezed using single-screw
Dewaterer further increases mass dryness fraction to sludge after pre-dehydration, it is ensured that sludge mass dryness fraction > 32% that sludge dewatering system transports, it is excellent
Select > 35%.
Spiral shell is carried out by single-screw squeezing dewatering machine, such as single axle helical squeezing dewatering machine or double-shaft spiral squeezing dewatering machine
Spinning squeezes dehydration.Current market sales of any spiral pressing dehydrator can be used in spiral pressing dehydrator.Work as mud extraction
Mass dryness fraction < 32%, the addition plant comminution of material into sludge quenched pond, such as straw light ash, stirring 10 to 100 minutes, preferably 30
It minute is uniformly mixed, dosage is adjusted that (straw light ash weight content is 10% in over dry sludge per ton according to mud extraction mass dryness fraction
To 20%, such as 16%).Start sludge dewatering delivery pump and dosing pump, sludge is sent into flocculation tank, and double spiral shells are entered after flocculation
Thickener is revolved, subsequently enters single-screw squeezing dewatering machine, single-screw squeezing dewatering machine running frequency usually requires > 30Hz.
The quenched pond of sludge is added in straw light ash by a certain percentage from the point of view of operational effect, does not influence sludge flocculation effect,
On double helix pre-concentration machine pre-dehydration also without influence, fiber content in sludge can be effectively increased, improves sludge in single spiral shell
Revolve frictional force in squeezing dewatering machine.To guarantee that sludge dewatering system efficient stable is run, the sludge mass dryness fraction > 32% of outward transport is kept away
Sewage drop is generated when exempting to load and unload sludge is sprinkled upon road surface effect environmental sanitation.Straw light ash itself is waste material disposal, is now used as and mentions
High sludge mass dryness fraction uses, and reduces independent processing cost.
Polyacrylamide cationic solution concentration 0.05-0.2wt%, additive amount is by production operation situation (non-dewatered sludge
Fiber content in concentration, non-dewatered sludge) determine, usual polyacrylamide cationic solution concentration in 0.2wt%,
Non- dewatered sludge and polyacrylamide cationic solution additive amount volume ratio 1:0.1-0.3.In addition general polyacrylamide sun from
Sub- solid additive amount is based on over dry mud 5kg-15kg per ton；Fiber content is high in non-dewatered sludge, and relative usage is low；It is not dehydrated dirt
Mud concentration is low, and relative usage is low.Usually used solution in the art can be used in polyacrylamide cationic solution.For example, river
The model of Su Fumiao Science and Technology Co., Ltd. production are as follows: the product etc. of the clear 3810DF of Rui Lishui.
The biomass sludge mass dryness fraction obtained after single-screw press dewatering is greater than 32wt%.In the prior art, reduce
Single-screw squeezing dewatering machine running frequency improves mud extraction mass dryness fraction, technic index 35wt% is often not achieved, mass dryness fraction can only be increased to
25wt%.The biomass sludge mass dryness fraction that method of the invention obtains is greater than 35wt%.
Compared with prior art, the present invention having the following beneficial effects:
The processing method of biomass sludge of the invention for fiber content in sludge it is low or without when, 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 to be crushed as waste material disposal using plant
Sludge after flocculation is easier to get together by structure and performance, and after increasing pre-dehydration sludge in single-screw squeezing dewatering machine
Frictional force.Since the frictional force between sludge and machine increases, single-screw squeezing dewatering machine running frequency also Ying Jia great, one
It is prevention sludge and axis locking, second is that increasing machine operational efficiency.
Now using cellulose mud fiber content height and the big feature of viscosity, add it in non-dewatered sludge, it is reasonable in this way
It utilizes, not only effectively improves sludge flocculation effect, reduce flocculant (polyacrylamide) drug dosage of market price valuableness,
And reduce independent processing cost.In addition, making the biomass sludge after final dewatering, when being used to prepare biomass fuel, more have
Conducive to molding, while calorific value obviously increases.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
The present invention is described further with reference to embodiments.
Embodiment 1
(1) plant comminution of material is added into biomass sludge and cellulose mud progress biomass sludge is quenched；
(2) biomass sludge flocculation is carried out after the mixing of polyacrylamide cationic solution being then added；
(3) last first double helix pre-dehydration processing, then the processing of single-screw press dewatering to get.
The additive amount of plant comminution of material is 300kg in step (1), with the poidometer of over dry mud per ton.
The additive amount of cellulose mud is 50kg in step (1), with the poidometer of over dry mud per ton.
Embodiment 2
(1) plant comminution of material is added into biomass sludge and cellulose mud progress biomass sludge is quenched；
(2) biomass sludge flocculation is carried out after the mixing of polyacrylamide cationic solution being then added；
(3) last first double helix pre-dehydration processing, then the processing of single-screw press dewatering to get.
The additive amount of plant comminution of material is 10kg in step (1), with the poidometer of over dry mud per ton.
The additive amount of cellulose mud is 10kg in step (1), with the poidometer of over dry mud per ton.
Embodiment 3
(1) plant comminution of material is added into biomass sludge and cellulose mud progress biomass sludge is quenched；
(2) biomass sludge flocculation is carried out after the mixing of polyacrylamide cationic solution being then added；
(3) last first double helix pre-dehydration processing, then the processing of single-screw press dewatering to get.
The additive amount of plant comminution of material is 600kg in step (1), with the poidometer of over dry mud per ton.
The additive amount of cellulose mud is 100kg in step (1), with the poidometer of over dry mud per ton.
Specific steps are as follows:
1, the quenched pond of sludge: position is built in sludge dewatering computer room Stall, the long 4m of specification × wide 4m × high 3.5m, surface
In second floor position, there are diameter 1.5m circular holes.The quenched pond blender machinery frame of sludge, frequency control, design speed 5rpm are raw
Substance sludge retention time is greater than 1h, sludge flocculation jar agitator mechanical agitation type, frequency control, design speed 30rpm, biology
Matter sludge and flocculant mixing residence time are greater than 8min.
2, sludge dewatering conveys pump power 7.5kW, flow 70m3/ h, lift 22m, frequency control；Cationic PAM (producer:
Jiangsu Feymer Technology Co., Ltd., model: the clear 3810DF of Rui Lishui) dosing pump power 3kW, flow 8m3/ h, lift 60m,
Frequency control.
3, cationic PAM (polyacrylamide) dispensing slot format diameter 2m, height 2m；Sludge flocculation tank format diameter
1.53m, height 2.2m.
4, double helix pre-concentration machine format diameter 0.65m, length 6m, frequency control；Single-screw squeezing dewatering machine specification is straight
Diameter 1m, length 10m；Rubber conveyer width 0.65m, length 9m, frequency control.
5, the index of straw light ash: moisture < 30%, partial size length < 10mm；It is dense that sludge concentration tank is sent into quenched pond sludge
Spend > 5%；Polyacrylamide cationic solution concentration 2 ‰.
6, when the quenched pond sludge quantity of sludge only has 15%, stalk is added according to single-screw squeezing dewatering machine mud extraction mass dryness fraction in right amount
Light ash (wheat-straw, average grain diameter 5mm, longest partial size 20mm) and cellulose mud (moisture 35%, cellulose 60%, ash content 5%),
Dosage such as 1 dewatering technology of mud operation data of table.After the completion of adding, from sludge concentration tank to the quenched pond of sludge into mud to liquid level
50%, opening blender stirring 30 minutes can starting device.
1 dewatering technology of mud operation data of table
7, single-screw squeezing dewatering machine running frequency and processing the quenched pond sludge magnitude relation of sludge, be shown in Table 2 device frequencies with
Handle sludge magnitude relation.
2 device frequency of table and processing sludge magnitude relation
8, sludge dewatering booting operation:
(1) sludge operative employee completes the preceding inspection of booting and prepares, and it is pre- that successively opening double helix is controlled in sludge 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 compartment type structure, depth 260cm, length
Spend 100cm, width 95cm.) into mud, it is controlled in notice and successively opens 2# rubber conveyer, 1# rubber conveyer, screw press dehydration
Machine.
(3) if single-screw squeezing dewatering machine mud extraction mass dryness fraction does not meet technic index (mass dryness fraction < 35%), by table 1 to sludge
After quenched pond adds appropriate straw light ash and cellulose mud, stirring can be switched on and continue to run for 30 minutes.
Before and after addition straw light ash and cellulose mud from the point of view of operation data comparison, single-screw squeezing dewatering machine is not only improved
Mud extraction mass dryness fraction (is greater than 35%), and due to the quickening of equipment running frequency, handles sludge quantity per hour and is also increased.In conjunction with
It is added in sludge for practical operation situation with rational proportion, further increases the operational efficiency of sludge dewatering system.
Carried out following experiment using the straw light ash of different average grain diameters, it is evident that average grain diameter be 5mm and
The increasing degree of maximum frequency of operation and 1mm and 30mm phase are bigger when 10mm.Dewatering technology of mud operation data and straw light ash
The relationship of (wheat) average grain diameter is shown in Table 3.
The relationship of 3 dewatering technology of mud operation data of table and grey (wheat) average grain diameter of straw light
* test specimen is chosen at not plus in straw light ash situation, single-screw squeezing dewatering machine mud extraction mass dryness fraction 31%-35%'s
Biomass sludge.
* over dry mud straw light ash dosage 90 (kg) per ton.
Claims (7)
1. a kind of method for improving biomass sludge mass dryness fraction, it is characterised in that steps are as follows:
(1) plant comminution of material is added into biomass sludge and cellulose mud progress biomass sludge is quenched；
(2) biomass sludge flocculation is carried out after the mixing of polyacrylamide cationic solution being then added；
(3) finally carry out spiral dehydration to get；
The plant comminution of material is the straw light ash after stalk cutting process；
The average grain diameter of the particle of the plant comminution of material is 4mm to 10mm, and partial size is 30mm or less；
The cellulose mud is the three element sludge obtained after separation rich in organic matter, and the solid content that lignin stoste contains exists
Calcium hydroxide precipitation filtering squeezing is added in three-level separation, obtains cellulose mud cake；The solid content that hemicellulose liquid contains is in waste water
Processing system is filtered by Microfilter, obtains cellulose filter residue, after cellulose mud cake and the mixing of cellulose filter residue, as cellulose
Mud；
The additive amount of the plant comminution of material is 10-600kg, with the poidometer of over dry mud per ton；
The additive amount of the cellulose mud is 10-100kg, with the poidometer of over dry mud per ton.
2. the method according to claim 1 for improving biomass sludge mass dryness fraction, it is characterised in that life described in step (1)
The water content of substance sludge is 80-99wt%.
3. the method according to claim 1 for improving biomass sludge mass dryness fraction, it is characterised in that plant described in step (1)
The moisture of object comminution of material is less than 30wt%.
4. the method according to claim 1 for improving biomass sludge mass dryness fraction, it is characterised in that fibre described in step (1)
Tieing up content of cellulose in plain mud is 40-60wt%, water content 30-50wt%, content of ashes 1-10wt%.
5. the method according to claim 1 for improving biomass sludge mass dryness fraction, it is characterised in that gather described in step (2)
The concentration of acrylamide cationic solution is 0.05-0.2wt%.
6. the method according to claim 1 for improving biomass sludge mass dryness fraction, it is characterised in that gather described in step (2)
The volume ratio of acrylamide cationic solution and biomass sludge is 0.1-0.3:1.
7. the method according to claim 1 for improving biomass sludge mass dryness fraction, it is characterised in that spiral shell described in step (3)
Rotating dehydration is first double helix pre-dehydration, then single-screw press dewatering.
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| NZ582254A (en) * | 2007-06-28 | 2012-07-27 | Buckman Labor Inc | Use of cyclodextrins for odor control in papermaking sludges, and deodorized sludge and products |
| CN101863610B (en) * | 2010-06-13 | 2012-05-09 | 江苏金山固体废弃物资源化科技有限公司 | Method for secondary deep dewatering of dewatered sludge |
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