CN109231792A - A kind of sludge dehydrating agent and its preparation method and application - Google Patents
A kind of sludge dehydrating agent and its preparation method and application Download PDFInfo
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- CN109231792A CN109231792A CN201811259482.7A CN201811259482A CN109231792A CN 109231792 A CN109231792 A CN 109231792A CN 201811259482 A CN201811259482 A CN 201811259482A CN 109231792 A CN109231792 A CN 109231792A
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- sludge
- dehydrating agent
- supply pipe
- copper water
- sludge dehydrating
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- 239000010802 sludge Substances 0.000 title claims abstract description 82
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000012024 dehydrating agents Substances 0.000 title claims description 43
- 239000010949 copper Substances 0.000 claims abstract description 41
- 229910052802 copper Inorganic materials 0.000 claims abstract description 41
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229920001661 Chitosan Polymers 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000010801 sewage sludge Substances 0.000 claims abstract description 6
- 239000011324 bead Substances 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 22
- 238000007711 solidification Methods 0.000 claims description 17
- 230000008023 solidification Effects 0.000 claims description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 12
- 239000011259 mixed solution Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 6
- 238000004132 cross linking Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000003672 processing method Methods 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 5
- 230000007062 hydrolysis Effects 0.000 abstract description 4
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 4
- 229920000642 polymer Polymers 0.000 abstract description 4
- 238000006068 polycondensation reaction Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 abstract description 2
- 230000009257 reactivity Effects 0.000 abstract description 2
- 239000000706 filtrate Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 9
- 150000001879 copper Chemical class 0.000 description 7
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 229920002101 Chitin Polymers 0.000 description 5
- 239000000693 micelle Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- 239000000701 coagulant Substances 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000010841 municipal wastewater Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 159000000013 aluminium salts Chemical class 0.000 description 2
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 230000001662 opsonic effect Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- -1 phosphate anion Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a kind of sludge dehydrating agents and its preparation method and application, including sewage sludge mud and chitosan solution, and the copper water-supply pipe mud is uniformly mixed with chitosan solution by the volume ratio of 1:2, then cured, filtering and drying form graininess bead.Wherein using copper water-supply pipe as matrix, chitosan is as modifying agent, by the way that crosslinking agent and solidify liquid is added, the polymer of macromolecular chain can be formed after poly-condensation and hydrolysis, to improve the reactivity of copper water-supply pipe, the dewatering to excess sludge is significantly improved, the processing cost of excess sludge is reduced, improves the resource utilization rate of copper water-supply pipe.And facility is simple, operation is easy, acts on staff's nonhazardous, will not generate secondary pollution, can have wider development space and application value in water treatment field with industrialization large-scale application.
Description
Technical field
The present invention relates to copper water-supply pipe process fields, in particular to a kind of sludge dehydrating agent and preparation method thereof and answer
With.
Background technique
Copper water-supply pipe is the pollutant that Municipal water-supply plant generates, be drinking water source water body sedimentation basin occur coagulation,
The sludge general name that flocculation settles down.The coagulant of extensive drinking water plant is iron, aluminium salt, so the master in copper water-supply pipe
Want ingredient based on the mixtures such as metal hydroxides, humus, turbidity coloration organic matter and silicate.The discharge of copper water-supply pipe
It can cause environmental pollution, how to dispose the task that copper water-supply pipe is also all waterworks facings.It has just given both at home and abroad
The disposition of sewage sludge has carried out lot of experiments, is modified to copper water-supply pipe and is directly used in sewage treatment etc., such as
CN105344312A discloses modified copper water-supply pipe small spherical particles of a kind of iron and the preparation method and application thereof, uses highly basic and molysite
Copper water-supply pipe is modified, phosphate anion and hydroxyl generation in sewage can be made to set by the iron hydroxide of release
It changes, to remove phosphate；If CN105903426A discloses a kind of modified copper water-supply pipe and its preparation method and application, first
Copper water-supply pipe is subjected to high-temperature roasting, then it is modified with aqueous slkali, as ammonia nitrogen adsorbent for removing micro- pollution
Ammonia nitrogen in water.But above method energy consumption is high, and high production cost is unfavorable for industrialized production using highly basic.And at present also not
Have using modified copper water-supply pipe and carries out the report in terms of sludge reduction.
Activated sludge process is most common technique in sewage treatment, and a large amount of High water cut can be generated in wastewater treatment process
The residual active sludge of amount causes sludge to have very big volume, this just brings difficulty to subsequent processing and disposition, therefore, mentions
The dehydration rate of high sludge reduces sludge volume, is the effective ways improved to the disposing capacity of sludge.Currently, excess sludge
Processing cost has accounted for the 25%~65% of entire sewage treatment expense, and presents and rise year by year trend, how to control excess sludge
Generation and develop sludge reduction technology have become a top priority, it is to generally use now that chemical floc is added into sludge
Sludge conditioning method.Present most common sludge dehydrating agent is polyacrylamide, although the dehydrating effect generated is preferably simultaneously
And be widely used, but its catabolite and monomer have a degree of harm to environment and human health.Or add iron
It is the dewatering with inorganic coagulants such as aluminium systems to enhance excess sludge, is discharged in environment and will cause secondary pollution.
Chitosan is a kind of natural polymer organic matter, with biocompatibility, easily biological-degradable, good water solubility it is excellent
Point, intramolecular contain a large amount of hydroxyl and amino, there is that flocculability is good, sequestering power is strong for absorption, nontoxic and nothing as water treatment agent
The advantages that secondary pollution.Chitosan and its derivative achieves good effect in the research of water process, in water process environment
In increasingly by extensive concern both domestic and external.
Summary of the invention
In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a kind of sludge dehydrating agents and preparation method thereof
And application, it is modified there are at high cost and be unfavorable for industrialized production to solve the problems, such as copper water-supply pipe, and improve copper water-supply pipe
Resource utilization in terms of sewage dehydration.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions: a kind of sludge dehydrating agent, including water
The copper water-supply pipe mud is uniformly mixed with chitosan solution by the volume ratio of 1:2, then passed through by sludge slurry and chitosan solution
Graininess bead made of solidification, filtering and drying.
Further, the partial size of the graininess bead is 0.3~0.4cm.
Further, the moisture content of the copper water-supply pipe mud is 80 ~ 90%.
Further, the concentration of the chitosan solution is 1 ~ 4%.
The preparation method of above-mentioned sludge dehydrating agent, which comprises the following steps:
1) copper water-supply pipe for being derived from water supply plant is eluriated for several times with clear water, and copper water-supply pipe mud is obtained by filtration；
2) chitosan is dissolved in 1% acetum, obtains chitosan solution；
3) chitosan solution of the copper water-supply pipe mud of step 1) preparation and step 2 preparation is uniformly mixed and obtains mixed solution,
Crosslinking agent is added in solidify liquid again and obtains solidification crosslinked fluid, then the mixed solution is added drop-wise in solidification crosslinked fluid, Gu
The solid globules that partial size is 0.4~0.6cm are obtained after changing crosslinking；
4) after the solid globules for obtaining step 3) filter out, be washed with deionized water, then by its in 60-80 DEG C dry 12 ~ for 24 hours,
Obtain sewage sludge dehydrating agent.
Further, the volume fraction for solidifying crosslinking agent in crosslinked fluid is 2 ~ 4%；The crosslinking agent is 2- epoxy-
3- chloropropane.
Further, the concentration of the solidify liquid is 1 ~ 3g/L, and the solidify liquid is NaOH solution.
Further, the solidification temperature is 40 ~ 60 DEG C, and curing time is 6 ~ 12h.
A kind of processing method of residual sludge reduction, sludge dewatering as described in claim 1 is added into excess sludge
Agent is filtered after static 5 ~ 30min.
Further, the additive amount of the sludge dehydrating agent is 0.5 ~ 4g/L.
The principle of the present invention: the ingredients such as remaining molysite, aluminium salt and the chitosan with linear polyamine in copper water-supply pipe,
Under the action of crosslinking agent, the polymer of macromolecular chain can be formed after poly-condensation and hydrolysis, increase have can with micelle and
The active site that fine suspension adsorbs, it is micro- to the colloid in sludge by electrostatic attraction, Van der Waals force and hydrogen bond force etc.
Grain has strong adsorption effect, and connection of being put up a bridge is floccule body one by one.Itself can be adsorbed on micelle table by polymer molecule
On one or more absorption positions in face, while the other end can adsorb another micelle again, and micelle apart from each other is contacted
Come, accelerates the sedimentation of micelle.And chitosan surface has a large amount of amino and hydroxyl group, to the fine particle in sludge
With stronger capture ability, sludge dehydrating agent (such as Fig. 1) can be served as.
Compared with prior art, the invention has the following beneficial effects:
1, sludge dehydrating agent prepared by the present invention, using copper water-supply pipe as matrix, chitosan is as modifying agent, by the way that crosslinking agent is added
And solidify liquid, the polymer of macromolecular chain can be formed after poly-condensation and hydrolysis, can make full use of copper water-supply pipe specific surface
Product is big, has the characteristics that porosity, to improve the reactivity of copper water-supply pipe, significantly improves the dehydration property to excess sludge
Can, the processing cost of excess sludge is reduced, the resource utilization rate of copper water-supply pipe is improved.
2, the present invention further studies water supply dirt in terms of the dosage of chitin modified copper water-supply pipe, sedimentation time amount
The opsonic action to excess sludge of mud finds that chitin modified copper water-supply pipe has played important function in terms of sludge dewatering.
3, the present invention settles waste-copper water-supply pipe and chitosan as raw material using waterworks settling tank, and chitosan resource is non-
It is often abundant, and nontoxic, harmless, facile hydrolysis, copper water-supply pipe material is easy to get, and it is at low cost, while solving copper water-supply pipe processing cost
Height transports difficult problem, achievees the purpose that waste utilization, avoid direct emission that from polluting to soil, water source etc., both economical
Environmental protection again, and facility is simple, operation is easy, acts on staff's nonhazardous, will not generate secondary pollution, can be big with industrialization
Sizable application has wider development space and application value in water treatment field.
Detailed description of the invention
Fig. 1 is that chitin modified copper water-supply pipe improves excess sludge mechanism schematic diagram；
Fig. 2 is the graph of relation of sludge dehydrating agent dosage and filtrate volume；
Fig. 3 is the graph of relation of sludge dehydrating agent dosage and filtrate turbidity；
Fig. 4 is the graph of relation of sludge dehydrating agent dosage and sedimentation time.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail.
One, a kind of sludge dehydrating agent and preparation method thereof
Embodiment 1
1) copper water-supply pipe for being derived from water supply plant is eluriated 3 times with clear water, and the copper water-supply pipe mud that moisture content is 90% is obtained by filtration；
2) it weighs a certain amount of chitosan and is dissolved with 1% acetum, obtain the chitosan solution that concentration is 2%；
3) chitosan solution for copper water-supply pipe mud and the step 2 preparation for taking step 1) to prepare, 1:2 is mixed by volume,
Mixed solution is obtained, obtaining volume fraction in the NaOH solution for being then 1 g/L by epoxychloropropane (ECH) addition concentration is 3%
Solidification crosslinked fluid, then by the mixed solution be added drop-wise to solidification crosslinked fluid in, at 40 DEG C solidification crosslinking 8h after obtain grain
Diameter is the solid globules of 0.4~0.6 cm；
4) solid globules for obtaining step 3) filter out, and are washed with deionized water, and drying obtains dirt for 24 hours in 60 DEG C of drying box
Mud dehydrating agent particle.The partial size for being examined the sludge dehydrating agent particle is 0.3cm.
Embodiment 2
1) copper water-supply pipe for being derived from water supply plant is eluriated 3 times with clear water, and the copper water-supply pipe mud that moisture content is 90% is obtained by filtration；
2) it weighs a certain amount of chitosan and is dissolved with 1% acetum, obtain the chitosan solution that concentration is 3%；
3) chitosan solution for copper water-supply pipe mud and the step 2 preparation for taking step 1) to prepare, 1:2 is mixed by volume,
Mixed solution is obtained, obtaining volume fraction in the NaOH solution for being then 1 g/L by epoxychloropropane (ECH) addition concentration is 2%
Solidification crosslinked fluid, then by the mixed solution be added drop-wise to solidification crosslinked fluid in, at 50 DEG C solidification crosslinking 12h after obtain grain
Diameter is the solid globules of 0.4~0.6 cm；
4) solid globules for obtaining step 3) filter out, and are washed with deionized water, and drying obtains dirt for 24 hours in 60 DEG C of drying box
Mud dehydrating agent particle.The partial size for being examined the sludge dehydrating agent particle is 0.3cm.
Embodiment 3
1) copper water-supply pipe for being derived from water supply plant is eluriated 3 times with clear water, and the copper water-supply pipe mud that moisture content is 80% is obtained by filtration；
2) it weighs a certain amount of chitosan and is dissolved with 1% acetum, obtain the chitosan solution that concentration is 1%；
3) chitosan solution for copper water-supply pipe mud and the step 2 preparation for taking step 1) to prepare, 1:2 is mixed by volume,
Mixed solution is obtained, is then that obtain volume fraction in the NaOH solution of 3g/L be 4% by epoxychloropropane (ECH) addition concentration
Solidification crosslinked fluid, then by the mixed solution be added drop-wise to solidification crosslinked fluid in, at 60 DEG C solidification crosslinking 6h after obtain grain
Diameter is the solid globules of 0.5cm；
4) solid globules for obtaining step 3) filter out, and are washed with deionized water, and dry 12h obtains dirt in 80 DEG C of drying box
Mud dehydrating agent particle.The partial size for being examined the sludge dehydrating agent particle is 0.4cm.
Two, application of the chitin modified copper water-supply pipe in terms of dehydrating residual active sludge
1, the residual active sludge of municipal wastewater treatment plant is taken, original moisture content is 92%, respectively respectively into 500mL excess sludge
Add sludge dehydrating agent prepared by same amount embodiment 1 (0.25g, 0.50g, 0.75g, 1.00g, 1.25g, 1.50g, 1.75g and
2.00g), it is filtered after standing 20min, records the volume change situation of filtrate.As a result as shown in Figure 2.
As shown in Figure 2, in a certain range, the volume of filtrate rises with the increase of sludge dehydrating agent dosage, but
When sludge dehydrating agent dosage is greater than 2.5g/L, filtrate volume variation is little, i.e., when sludge dehydrating agent dosage is 2.5g/L,
The volume of filtrate is maximum, and sludge dehydrating agent is best to the flocculation dewatering effect of excess sludge at this time.
2, the residual active sludge of municipal wastewater treatment plant is taken, original moisture content is 92%, respectively into 500mL excess sludge
Add sewage sludge dehydrating agent prepared by same amount embodiment 1 (0.25g, 0.50g, 0.75g, 1.00g, 1.25g, 1.50g,
1.75g and 2.00g), it is filtered after standing 20min, measures filtrate turbidity and record, as a result as shown in Figure 3.
From the figure 3, it may be seen that the filtrate turbidity without sludge dehydrating agent conditioning is very high, 198.2NTU is reached, with sludge dehydrating agent
Add increase, the turbidity of filtrate gradually decreases, and illustrates that the particulate matter and colloidal substance in filtrate gradually decrease.Work as sludge dewatering
When agent dosage is greater than 2.5g/L, the turbidity reduction of filtrate is unobvious, shows that the optimal coagulant dose of sludge dehydrating agent is 2.5g/L.
3, the residual active sludge of municipal wastewater treatment plant is taken, original moisture content is 92%, and residual active sludge is divided into experiment
Group and control group, every group has 6 parts of identical 500mL excess sludges, experimental group: adds 1.25g into every part of 500mL excess sludge
Sewage sludge dehydrating agent prepared by embodiment 1, after then standing 5min, 10min, 15min, 20min, 25min, 30min respectively
Filtering, records the volume change situation of filtrate；Blank group: it is dirty that chitin modified water supply is not added to every part of 500mL excess sludge
Mud filters after standing 5min, 10min, 15min, 20min, 25min, 30min respectively, records the volume change situation of filtrate.Knot
Fruit is as shown in Figure 4.
As shown in Figure 4, in identical time of repose, the filtrate volume after adding sludge dehydrating agent is higher than the filter of primary sludge
Liquid product, when resting between when being 10min, the filtrate volume that experimental group obtains about 70mL, and control group is only 2mL, that is, is passed through
After sludge dehydrating agent conditioning, the sinking speed of excess sludge is greatly accelerated, settling property is improved, when shortening sedimentation
Between.With the increase of quiescent time, obtained filtrate volume is also increased as, when resting between be greater than 20min after, filtrate volume
It is unobvious to change over time increase.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not limitation with the present invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of sludge dehydrating agent, which is characterized in that including sewage sludge mud and chitosan solution, by the copper water-supply pipe mud
It is uniformly mixed with chitosan solution by the volume ratio of 1:2, then graininess bead made of cured, filtering and drying.
2. sludge dehydrating agent according to claim 1, which is characterized in that the partial size of the graininess bead be 0.3~
0.4cm。
3. sludge dehydrating agent according to claim 1, which is characterized in that the moisture content of the copper water-supply pipe mud be 80 ~
90%。
4. sludge dehydrating agent according to claim 1, which is characterized in that the concentration of the chitosan solution is 1 ~ 3%.
5. such as the preparation method of any one of claim 1 ~ 4 sludge dehydrating agent, which comprises the following steps:
1) copper water-supply pipe for being derived from water supply plant is eluriated for several times with clear water, and copper water-supply pipe mud is obtained by filtration；
2) chitosan is dissolved in 1% acetum, obtains chitosan solution；
3) chitosan solution of the copper water-supply pipe mud of step 1) preparation and step 2 preparation is uniformly mixed and obtains mixed solution,
Crosslinking agent is added in solidify liquid again and obtains solidification crosslinked fluid, then the mixed solution is added drop-wise in solidification crosslinked fluid, Gu
The solid globules that partial size is 0.4~0.6cm are obtained after changing crosslinking；
4) after the solid globules for obtaining step 3) filter out, be washed with deionized water, then by its in 60-80 DEG C dry 12 ~ for 24 hours,
Obtain sludge dehydrating agent.
6. the preparation method of sludge dehydrating agent according to claim 5, which is characterized in that crosslinking agent in the solidification crosslinked fluid
Volume fraction be 2 ~ 4%；The crosslinking agent is 2- epoxy -3- chloropropane.
7. the preparation method of sludge dehydrating agent according to claim 5, which is characterized in that the concentration of the solidify liquid be 1 ~
3g/L, the solidify liquid are NaOH solution.
8. the preparation method of sludge dehydrating agent according to claim 5, which is characterized in that the solidification temperature is 40 ~ 60 DEG C,
Curing time is 6 ~ 12h.
9. a kind of processing method of residual sludge reduction, which is characterized in that added into excess sludge as described in claim 1
Sludge dehydrating agent filters after static 5 ~ 30min.
10. the processing method of residual sludge reduction according to claim 9, which is characterized in that the sludge dehydrating agent
Additive amount is 0.5 ~ 4g/L.
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| CN201811259482.7A CN109231792A (en) | 2018-10-26 | 2018-10-26 | A kind of sludge dehydrating agent and its preparation method and application |
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| CN201811259482.7A CN109231792A (en) | 2018-10-26 | 2018-10-26 | A kind of sludge dehydrating agent and its preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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