CN108328905A - A kind of sludge dehydration conditioner and its application method - Google Patents
A kind of sludge dehydration conditioner and its application method Download PDFInfo
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- CN108328905A CN108328905A CN201810235031.3A CN201810235031A CN108328905A CN 108328905 A CN108328905 A CN 108328905A CN 201810235031 A CN201810235031 A CN 201810235031A CN 108328905 A CN108328905 A CN 108328905A
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- Prior art keywords
- sludge
- dehydration conditioner
- dihydrogen phosphate
- potassium dihydrogen
- polymeric aluminum
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- 239000010802 sludge Substances 0.000 title claims abstract description 148
- 230000018044 dehydration Effects 0.000 title claims abstract description 58
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001914 filtration Methods 0.000 claims abstract description 50
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 43
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical class Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims abstract description 40
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 38
- 238000002156 mixing Methods 0.000 claims abstract description 31
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims abstract description 30
- 235000019796 monopotassium phosphate Nutrition 0.000 claims abstract description 30
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims abstract description 30
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 27
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 9
- 230000001376 precipitating effect Effects 0.000 claims description 8
- 239000000243 solution Substances 0.000 abstract description 76
- 239000007788 liquid Substances 0.000 abstract description 19
- 238000003825 pressing Methods 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 abstract description 11
- 230000007062 hydrolysis Effects 0.000 abstract description 10
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 10
- 239000010801 sewage sludge Substances 0.000 abstract description 10
- 230000002378 acidificating effect Effects 0.000 abstract description 9
- 238000005189 flocculation Methods 0.000 abstract description 9
- 230000016615 flocculation Effects 0.000 abstract description 9
- 230000003750 conditioning effect Effects 0.000 abstract description 8
- 238000010790 dilution Methods 0.000 abstract description 6
- 239000012895 dilution Substances 0.000 abstract description 6
- 150000001875 compounds Chemical class 0.000 abstract description 5
- 229960004887 ferric hydroxide Drugs 0.000 abstract description 5
- 230000003311 flocculating effect Effects 0.000 abstract description 5
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 abstract description 5
- 239000002244 precipitate Substances 0.000 abstract description 5
- 238000001556 precipitation Methods 0.000 abstract description 5
- 159000000013 aluminium salts Chemical class 0.000 abstract description 4
- 229910000329 aluminium sulfate Inorganic materials 0.000 abstract description 4
- 238000005530 etching Methods 0.000 abstract description 4
- 239000008394 flocculating agent Substances 0.000 abstract description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 10
- 239000004411 aluminium Substances 0.000 description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical compound [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- -1 iron ion Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical compound OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- SEGLCEQVOFDUPX-UHFFFAOYSA-N di-(2-ethylhexyl)phosphoric acid Chemical compound CCCCC(CC)COP(O)(=O)OCC(CC)CCCC SEGLCEQVOFDUPX-UHFFFAOYSA-N 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003571 opsonizing effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007787 solid 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
When sludge dehydration conditioner disclosed by the invention is mixed with water-containing sludge, polymeric aluminum chlorides solution dilution generates aluminum hydroxide precipitation after hydrolysis, is flocculated and settled.Ferric chloride solution dilutes, and generates ferric hydroxide precipitate after hydrolysis, there is extremely strong cohesiveness, and the alumen ustum of formation is closely knit, and flocculating property is excellent, and sinking speed is higher than aluminium salt series flocculants.The addition of potassium dihydrogen phosphate, which avoids in polymeric aluminum chlorides solution and liquor ferri trichloridi mixing compound process, occurs gel so that iron chloride plays more preferably flocculation during sludge conditioning.Meanwhile the cushioning effect of potassium dihydrogen phosphate, the deep-etching effect of iron chloride can be alleviated, reduce the damage to equipment, the pH value of obtained pressing filtering liquid is weakly acidic.Polymeric aluminum chlorides solution, ferric chloride solution and potassium dihydrogen phosphate are acted synergistically with certain proportioning, and treated, and moisture percentage in sewage sludge is relatively low, meanwhile, the pH value of pressing filtering liquid is weakly acidic, and dewatered sludge incrementss almost can be ignored.
Description
Technical field
The present invention relates to urban life sludge and industrial sludge processing technology fields more particularly to a kind of sludge dewatering to improve
Agent and its application method.
Background technology
Sludge caused by town domestic sewage and Industrial Waste Water Treatments has higher water content, due to moisture and sludge
The characteristic that particle combines has certain limitation using mechanical means removing.In general, 20 can be obtained using mechanical dehydration
~30% solid content is formed by sludge and is also referred to as mud cake.The moisture content of mud cake is still higher, has fluid properties,
It disposes difficulty and cost is still higher, mishandling, easy corruption is smelly, causes secondary pollution.
Currently, conditioner used in China's sludge dewatering Opsonizing method includes mainly following four：Add polyaluminium
The conditioner of aluminium and polyacrylamide, the conditioner of addition ferric trichloride and polyacrylamide, addition aluminium polychloride and lime
Conditioner, add ferric trichloride and lime conditioner.However, using the conditioning of addition aluminium polychloride and polyacrylamide
Agent improve sludge, for the dewatering rate after conditioning 60% or more, dehydrating effect is simultaneously bad, cause sludge outward transport cost of disposal compared with
It is high.Sludge is improved using the conditioner of addition ferric trichloride and polyacrylamide, the pH value of obtained pressing filtering liquid is very low, generally exists
Between 2~3.5, severe corrosion to equipment, it is also desirable to put into a large amount of alkali to be neutralized, cost is higher.And it adopts
The conditioner that ferric trichloride and lime are either added with the conditioner of addition aluminium polychloride and lime is improved, after processing
Dewatered sludge incrementss it is larger, meanwhile, the filter plate of filter press and outlet conduit can be made to form a large amount of lime scale formation, after fouling
Filter plate and pipeline it is very difficult, thus, the maintenance cost of equipment and the outward transport cost of disposal of sludge are higher.
Invention content
In view of this, the technical problem to be solved in the present invention is to provide a kind of sludge dehydration conditioner and its user
Method improves sludge using sludge dehydration conditioner provided by the invention, and treated, and moisture percentage in sewage sludge is relatively low, the pH value of pressing filtering liquid
Weakly acidic, dewatered sludge incrementss are less.
The present invention provides a kind of sludge dehydration conditioner, meter in parts by weight includes：
6~7 parts of polymeric aluminum chlorides solution；
2~4 parts of ferric chloride solution；
0.01~0.02 part of potassium dihydrogen phosphate.
Preferably, the content of aluminium oxide is 9.8~10.2wt% in the polymeric aluminum chlorides solution.
Preferably, the content of iron oxide is 9.8~10.2wt% in the ferric chloride solution.
Preferably, purity >=99% of the potassium dihydrogen phosphate.
The present invention also provides a kind of application methods of sludge dehydration conditioner described above, including：
After sludge and sludge dehydration conditioner mixing, obtained precipitating sludge carries out press filtration, obtains dewatered sludge.
Preferably, the moisture content of the sludge is 88%~95%；
The mass ratio of the sludge and the sludge dehydration conditioner is 100：1.0~3.6.
Preferably, the mixing carries out under stirring conditions.
Preferably, the temperature of the mixing is 10~40 DEG C；The time of the mixing is 10~35min.
Preferably, will after sludge and sludge dehydration conditioner mixing, further include filtering；
The pressure of the filtering is 0.6~1.0Mpa, and the time of the filtering is 30~90min.
Preferably, the pressure of the press filtration is 1.5~2.0Mpa, and the time of the press filtration is 30~90min.
The present invention provides a kind of sludge dehydration conditioner, meter in parts by weight includes：
6~7 parts of polymeric aluminum chlorides solution；
2~4 parts of ferric chloride solution；
0.01~0.02 part of potassium dihydrogen phosphate.
In sludge dehydration conditioner disclosed by the invention, the iron ion in ferric chloride solution exists in the form of iron oxide,
Aluminium ion in polymeric aluminum chlorides solution exists in the form of aluminium oxide.The sludge dehydration conditioner is mixed with water-containing sludge
When, polymeric aluminum chlorides solution dilution generates aluminum hydroxide precipitation after hydrolysis, proceeds by flocculation and sedimentation.Ferric chloride solution is dilute
It releases, ferric hydroxide precipitate is generated after hydrolysis, have extremely strong cohesiveness, and the alumen ustum formed is closely knit, flocculating property is excellent, sedimentation speed
Degree is higher than aluminium salt series flocculants.In sludge dehydration conditioner disclosed by the invention, potassium dihydrogen phosphate, biphosphate also added
Potassium, which avoids in polymeric aluminum chlorides solution and ferric chloride solution mixing compound process, occurs gel so that iron chloride is in sludge conditioning
More preferably flocculation is played in the process.Therefore, critical effect is played for effective dehydration of sludge.Meanwhile di(2-ethylhexyl)phosphate
The cushioning effect of hydrogen potassium can alleviate the deep-etching effect of iron chloride, reduce the damage to equipment, the pH of obtained pressing filtering liquid
It is worth weakly acidic, it is easier to handle.The present invention is by controlling polymeric aluminum chlorides solution, ferric chloride solution and potassium dihydrogen phosphate
Content can effectively remove the moisture in sludge, keep dewatered moisture percentage in sewage sludge relatively low, meanwhile, the pH value of pressing filtering liquid is in weak
Acidity, dewatered sludge incrementss are less.
The experimental results showed that improving sludge, obtained moisture percentage in sewage sludge using sludge dehydration conditioner provided by the invention
Between 48~58.5%, for the pH value of pressing filtering liquid between 6.0~6.5, dewatered sludge incrementss are less than 1.5%.
Specific implementation mode
Below in conjunction with the embodiment of the present invention, technical scheme of the present invention is clearly and completely described, it is clear that institute
The embodiment of description is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair
The range of bright protection.
The present invention provides a kind of sludge dehydration conditioner, meter in parts by weight includes：
6~7 parts of polymeric aluminum chlorides solution；
2~4 parts of ferric chloride solution；
0.01~0.02 part of potassium dihydrogen phosphate.
Sludge dehydration conditioner provided by the invention includes polymeric aluminum chlorides solution.The present invention is molten to the aluminium polychloride
The preparation method of liquid has no special limitation, using the preparation method of solution well known to those skilled in the art.The present invention
Preferably：Aluminium polychloride is mixed with water, obtains polymeric aluminum chlorides solution.The parts by weight of the polymeric aluminum chlorides solution are
6~7 parts.In certain embodiments of the present invention, the parts by weight of the polymeric aluminum chlorides solution are 6.9895 parts.In the present invention
In, the aluminium ion in polymeric aluminum chlorides solution exists in the form of aluminium oxide, and aluminium oxide contains in the polymeric aluminum chlorides solution
Amount is preferably 9.8~10.2wt%.In certain embodiments of the present invention, in the polymeric aluminum chlorides solution aluminium oxide content
For 10wt%.When the sludge dehydration conditioner is mixed with water-containing sludge, polymeric aluminum chlorides solution dilution generates hydrogen-oxygen after hydrolysis
Change aluminum precipitation, proceeds by flocculation and sedimentation.
Sludge dehydration conditioner provided by the invention includes ferric chloride solution.Preparation of the present invention to the ferric chloride solution
Method has no special limitation, using the preparation method of solution well known to those skilled in the art.The present invention is preferably：It will
Iron chloride is mixed with water, obtains ferric chloride solution.The parts by weight of the ferric chloride solution are 2~4 parts.In the certain of the present invention
In embodiment, the parts by weight of the ferric chloride solution are 2.9955 parts.In the present invention, the iron ion in ferric chloride solution with
The form of iron oxide exists, and the content of iron oxide is preferably 9.8~10.2wt% in the ferric chloride solution.In certain of the present invention
In a little embodiments, the content of iron oxide is 10wt% in the ferric chloride solution.The sludge dehydration conditioner and water-containing sludge
When mixing, ferric chloride solution dilution generates ferric hydroxide precipitate after hydrolysis, has extremely strong cohesiveness, and the alumen ustum formed is closely knit,
Flocculating property is excellent, and sinking speed is higher than aluminium salt series flocculants.
Sludge dehydration conditioner provided by the invention further includes potassium dihydrogen phosphate.The parts by weight of the potassium dihydrogen phosphate are
0.01~0.02 part.In certain embodiments of the present invention, the parts by weight of the potassium dihydrogen phosphate are 0.015 part.In this hair
In bright, the purity of the potassium dihydrogen phosphate is preferably >=99%.The addition of the potassium dihydrogen phosphate avoids polymeric aluminum chlorides solution
Gel occurs in ferric chloride solution mixing compound process so that iron chloride plays more preferably flocculation during sludge conditioning and makees
With.Therefore, critical effect is played for effective dehydration of sludge.Meanwhile the cushioning effect of potassium dihydrogen phosphate, it can alleviate
The deep-etching of iron chloride acts on, and reduces the damage to equipment, the pH value of obtained pressing filtering liquid is weakly acidic, it is easier to handle.
The present invention, can be effective by the content of control polymeric aluminum chlorides solution, ferric chloride solution and potassium dihydrogen phosphate
The moisture in sludge is removed, treated, and moisture percentage in sewage sludge is relatively low, meanwhile, the pH value of pressing filtering liquid is weakly acidic, and dewatered sludge increases
It measures less.The present invention is by further controlling in polymeric aluminum chlorides solution iron oxide in the content of aluminium oxide and ferric chloride solution
Content has facilitation for improving said effect.
In the present invention, the sludge dehydration conditioner is preferably prepared in accordance with the following methods：
Polymeric aluminum chlorides solution, ferric chloride solution and potassium dihydrogen phosphate are mixed, sludge dehydration conditioner is obtained after reaction.
The component and proportioning of the raw material are same as above, and details are not described herein.
The temperature of the reaction is preferably room temperature.The time of the reaction is preferably 30~60min.In the certain of the present invention
In embodiment, the time of the reaction is 45min.
The present invention also provides a kind of application methods of sludge dehydration conditioner described above, including：
After sludge and sludge dehydration conditioner mixing, obtained precipitating sludge carries out press filtration, obtains dewatered sludge.
Under normal circumstances, moisture percentage in sewage sludge is different, then the dosage of sludge dehydration conditioner is also different.At this
In invention, the moisture content of the sludge is preferably 88%~95%.In certain embodiments of the present invention, the sludge is aqueous
Rate is 94% or 94.5%.The mass ratio of the sludge and the sludge dehydration conditioner is preferably 100：1.0~3.6.At this
In some embodiments of invention, the mass ratio of the sludge and the sludge dehydration conditioner is 100：1.4 or 100：1.3.
The present invention has no the source of sludge special limitation, dirty caused by town domestic sewage and Industrial Waste Water Treatments
Mud can be with.In certain embodiments of the present invention, the sludge is sludge or the Shenzhen of Shenzhen South Mountain purification of water quality factory
The sludge of Feitian purification of water quality factory.
The mixing preferably carries out under stirring conditions.The present invention has no the method for the stirring special limitation,
Using stirring means well known to those skilled in the art.The present invention has no the speed of the stirring special limitation, energy
It is enough to be uniformly mixed the sludge with the sludge dehydration conditioner.The temperature of the mixing is preferably 10~40 DEG C.
In certain embodiments of the present invention, the temperature of the mixing is room temperature.The time of the mixing is preferably 10~35min.At this
In some embodiments of invention, the time of the mixing is 30min or 35min.The sludge and sludge dehydration conditioner mixing
Equipment be preferably equipped with frequency-conversion agitator sludge conditioning tank.
When the sludge dehydration conditioner is mixed with water-containing sludge, polymeric aluminum chlorides solution dilution generates hydrogen-oxygen after hydrolysis
Change aluminum precipitation, proceeds by flocculation.Ferric chloride solution dilutes, and generates ferric hydroxide precipitate after hydrolysis, there is extremely strong cohesiveness, and
The alumen ustum of formation is closely knit, and flocculating property is excellent.The addition of potassium dihydrogen phosphate avoids polymeric aluminum chlorides solution and ferric trichloride is molten
Gel occurs in liquid mixing compound process so that iron chloride plays more preferably flocculation during sludge conditioning.Therefore, right
Critical effect is played in effective dehydration of sludge.Meanwhile the cushioning effect of potassium dihydrogen phosphate, the strong of iron chloride can be alleviated
Corrosiveness reduces the damage to equipment, and the pH value of obtained pressing filtering liquid is weakly acidic, it is easier to handle.Thus, it is above-mentioned mixed
Even process is also flocculated process simultaneously.
After sludge and sludge dehydration conditioner mixing, the present invention preferably further includes filtering, obtains precipitating sludge.The mistake
The pressure of filter is preferably 0.6~1.0Mpa.In certain embodiments of the present invention, the pressure of the filtering be 1.0Mpa or
0.9Mpa.The time of the filtering is preferably 30~90min.In certain embodiments of the present invention, the time of the filtering is
35min.The equipment of the filtering is preferably charge filter.
Then, obtained precipitating sludge is subjected to press filtration, obtains dewatered sludge.In the present invention, the pressure of the press filtration
Preferably 1.5~2.0Mpa.In certain embodiments of the present invention, the pressure of the press filtration is 1.7Mpa or 1.65Mpa.It is described
The time of press filtration is preferably 30~90min.In certain embodiments of the present invention, the time of the press filtration be 45min or
50min.The equipment of the press filtration is preferably diaphragm filter press.In certain embodiments of the present invention, the equipment of the press filtration is
The microdiaphragm filter press of Hangzhou Xing Yuan environmental protection equipments Co., Ltd production.
The present invention has no special limitation to the source of above-mentioned used raw material components, can be general commercially available.
The present invention provides a kind of sludge dehydration conditioner, meter in parts by weight includes：
6~7 parts of polymeric aluminum chlorides solution；
2~4 parts of ferric chloride solution；
0.01~0.02 part of potassium dihydrogen phosphate.
In sludge dehydration conditioner disclosed by the invention, the iron ion in ferric chloride solution exists in the form of iron oxide,
Aluminium ion in polymeric aluminum chlorides solution exists in the form of aluminium oxide.The sludge dehydration conditioner is mixed with water-containing sludge
When, polymeric aluminum chlorides solution dilution generates aluminum hydroxide precipitation after hydrolysis, proceeds by flocculation and sedimentation.Ferric chloride solution is dilute
It releases, ferric hydroxide precipitate is generated after hydrolysis, have extremely strong cohesiveness, and the alumen ustum formed is closely knit, flocculating property is excellent, sedimentation speed
Degree is higher than aluminium salt series flocculants.In sludge dehydration conditioner disclosed by the invention, potassium dihydrogen phosphate, biphosphate also added
Potassium, which avoids in polymeric aluminum chlorides solution and liquor ferri trichloridi mixing compound process, occurs gel so that iron chloride is in sludge tune
More preferably flocculation is played during reason.Therefore, critical effect is played for effective dehydration of sludge.Meanwhile phosphoric acid
The cushioning effect of potassium dihydrogen can alleviate the deep-etching effect of iron chloride, reduce the damage to equipment, obtained pressing filtering liquid
PH value is weakly acidic, it is easier to handle.The present invention is by controlling polymeric aluminum chlorides solution, ferric chloride solution and potassium dihydrogen phosphate
Content, can effectively remove the moisture in sludge, so as to get moisture percentage in sewage sludge it is relatively low, meanwhile, the pH value of pressing filtering liquid is in weak
Acidity, dewatered sludge incrementss are less.
The experimental results showed that improving sludge, obtained moisture percentage in sewage sludge using sludge dehydration conditioner provided by the invention
Between 48~58.5%, for the pH value of pressing filtering liquid between 6.0~6.5, dewatered sludge incrementss are less than 1.5%.
In order to further illustrate the present invention, with reference to embodiment to a kind of sludge dehydration conditioner provided by the invention and
Its application method is described in detail, but cannot they be interpreted as limiting the scope of the present invention.
Raw material used in following embodiment is commercially available.
Embodiment 1
By the polymeric aluminum chlorides solution of 6.9895 parts by weight, the ferric chloride solution of 2.9955 parts by weight and 0.015 parts by weight
Potassium dihydrogen phosphate mixing, after normal-temperature reaction 45min, obtain sludge dehydration conditioner.Wherein, it is aoxidized in polymeric aluminum chlorides solution
The content of aluminium is 10wt%, and the content of iron oxide is 10wt%, purity >=99% of potassium dihydrogen phosphate in ferric chloride solution.
With sludge dehydration conditioner it is 100 according to mass ratio by sludge that moisture content is 94%：1.4 stir and evenly mix, described
The temperature of mixing is room temperature, and the time stirred and evenly mixed is 30min, and the equipment of the mixing is the dirt equipped with frequency-conversion agitator
Mud improves tank.Then, in charge filter, in pressure for filter 23 5min under 1.0Mpa, obtained precipitating sludge is in pressure
Press filtration 45min under 1.7Mpa, the equipment of the press filtration are the microdiaphragm press filtration of Hangzhou Xing Yuan environmental protection equipments Co., Ltd production
Machine obtains dewatered sludge.The sludge is the sludge of Shenzhen South Mountain purification of water quality factory.
The experimental results showed that the moisture content of obtained dewatered sludge is 48~58%, the pH value of pressing filtering liquid is 6.3, does dirt
Mud incrementss are 1.3%.
Embodiment 2
By the polymeric aluminum chlorides solution of 6.9895 parts by weight, the ferric chloride solution of 2.9955 parts by weight and 0.015 parts by weight
Potassium dihydrogen phosphate mixing, after normal-temperature reaction 45min, obtain sludge dehydration conditioner.Wherein, it is aoxidized in polymeric aluminum chlorides solution
The content of aluminium is 10wt%, and the content of iron oxide is 10wt%, purity >=99% of potassium dihydrogen phosphate in ferric chloride solution.
With sludge dehydration conditioner it is 100 according to mass ratio by sludge that moisture content is 94.5%：1.3 stir and evenly mix, institute
The temperature for stating mixing is room temperature, and the time stirred and evenly mixed is 35min, and the equipment of the mixing is equipped with frequency-conversion agitator
Sludge conditioning tank.Then, in charge filter, the filter 23 5min in the case where pressure is 0.9Mpa, obtained precipitating sludge is in pressure
For press filtration 50min under 1.65Mpa, the equipment of the press filtration is the microdiaphragm pressure of Hangzhou Xing Yuan environmental protection equipments Co., Ltd production
Filter obtains dewatered sludge.The sludge is the sludge of Shenzhen Feitian purification of water quality factory.
The experimental results showed that the moisture content of obtained dewatered sludge is 54~58.5%, the pH value of pressing filtering liquid is 6.2, is done
Sludge incrementss are 1.2%.
Comparative example 1
The polymeric aluminum chlorides solution of 8 parts by weight and the ferric chloride solution of 2 parts by weight are mixed, after normal-temperature reaction 45min, obtained
To sludge dehydration conditioner.Wherein, the content of aluminium oxide is 8wt% in polymeric aluminum chlorides solution, iron oxide in ferric chloride solution
Content be 2wt%.
With sludge dehydration conditioner it is 100 according to mass ratio by sludge that moisture content is 94%：1.4 stir and evenly mix, described
The temperature of mixing is room temperature, and the time stirred and evenly mixed is 30min, and the equipment of the mixing is the dirt equipped with frequency-conversion agitator
Mud improves tank.Then, in charge filter, in pressure for filter 23 5min under 1.0Mpa, obtained precipitating sludge is in pressure
Press filtration 45min under 1.7Mpa, the equipment of the press filtration are the microdiaphragm press filtration of Hangzhou Xing Yuan environmental protection equipments Co., Ltd production
Machine obtains dewatered sludge.The sludge is the sludge of Shenzhen South Mountain purification of water quality factory.
The experimental results showed that the moisture content of obtained dewatered sludge is 60~65%, the pH value of pressing filtering liquid is 5.8, does dirt
Mud incrementss are 1.4%.
Pass through above-described embodiment and comparative example, it can be seen that the present invention is using polymeric aluminum chlorides solution, ferric chloride solution
Component with potassium dihydrogen phosphate as sludge dehydration conditioner of the present invention, by controlling polymeric aluminum chlorides solution, ferric chloride solution
And the content of potassium dihydrogen phosphate, can effectively remove the moisture in sludge, so as to get moisture percentage in sewage sludge it is lower, meanwhile, pressure
The pH value of filtrate is weakly acidic, and dewatered sludge incrementss are less.The experimental results showed that being improved using sludge dewatering provided by the invention
Agent improves sludge, and obtained moisture percentage in sewage sludge is between 48~58.5%, and the pH value of pressing filtering liquid is between 6.0~6.5, dewatered sludge
Incrementss are less than 1.5%.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (10)
1. a kind of sludge dehydration conditioner, in parts by weight meter include：
6~7 parts of polymeric aluminum chlorides solution；
2~4 parts of ferric chloride solution；
0.01~0.02 part of potassium dihydrogen phosphate.
2. sludge dehydration conditioner according to claim 1, which is characterized in that aluminium oxide in the polymeric aluminum chlorides solution
Content be 9.8~10.2wt%.
3. sludge dehydration conditioner according to claim 1, which is characterized in that iron oxide contains in the ferric chloride solution
Amount is 9.8~10.2wt%.
4. sludge dehydration conditioner according to claim 1, which is characterized in that the purity of the potassium dihydrogen phosphate >=
99%.
5. the application method of sludge dehydration conditioner described in a kind of claim 1, including：
After sludge and sludge dehydration conditioner mixing, obtained precipitating sludge carries out press filtration, obtains dewatered sludge.
6. application method according to claim 5, which is characterized in that the moisture content of the sludge is 88%~95%；
The mass ratio of the sludge and the sludge dehydration conditioner is 100：1.0~3.6.
7. application method according to claim 5, which is characterized in that the mixing carries out under stirring conditions.
8. application method according to claim 5, which is characterized in that the temperature of the mixing is 10~40 DEG C；It is described mixed
The even time is 10~35min.
9. application method according to claim 5, which is characterized in that after sludge and sludge dehydration conditioner mixing, also
Including filtering；
The pressure of the filtering is 0.6~1.0Mpa, and the time of the filtering is 30~90min.
10. application method according to claim 5, which is characterized in that the pressure of the press filtration is 1.5~2.0Mpa, institute
The time for stating press filtration is 30~90min.
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