CN106082411B - A kind of preparation method of efficient dephosphorization compounding coagulation agent - Google Patents
A kind of preparation method of efficient dephosphorization compounding coagulation agent Download PDFInfo
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- CN106082411B CN106082411B CN201610544743.4A CN201610544743A CN106082411B CN 106082411 B CN106082411 B CN 106082411B CN 201610544743 A CN201610544743 A CN 201610544743A CN 106082411 B CN106082411 B CN 106082411B
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- lanthanum chloride
- coagulation agent
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a kind of preparation methods of efficient dephosphorization compounding coagulation agent, belong to water-treatment technology field, comprising the following steps: (1) lanthanum chloride that partial size is 80 ~ 120nm are dissolved in the water, the concentration of lanthanum chloride solution is 2.1g/L；(2) the nanoscale diatomite in powder that partial size is 80 ~ 120nm is added in lanthanum chloride solution, stir evenly obtained colloid mixed liquor, (3) stirring of above-mentioned mixed liquor is added in the polymeric aluminum chlorides solution of mass concentration≤5% and forms suspension, spray drying obtains the efficient dephosphorization compounding coagulation agent that partial size is 0.4 ~ 0.6mm.The mixing mode that the present invention uses mechanical stirring and compressed air to stir can make the full and uniform mixing of each compounding component, increase product stability.
Description
Technical field
The invention belongs to water-treatment technology fields, and in particular to a kind of preparation method of efficient dephosphorization compounding coagulation agent.
Background technique
Qualified discharge is not the main reason for causing water eutrophication for nitrogen, phosphorus in sanitary sewage and industrial wastewater, and phosphorus is
The restriction factor of poisons in freshwater eutrophication.Biological phosphate-eliminating is current used mainstream dephosphorization process, but is discharged total phosphorus and is difficult to
Stably reaching standard (" urban wastewater treatment firm pollutant emission standard " GB 18918-2002 TP≤0.5mg/L), therefore, China city
Town sewage treatment plant generallys use coagulant enhanced biological phosphorus removal or Tailwater Depth dephosphorization guarantees that water outlet total phosphorus is up to standard.
Coagulant used in city domestic sewage can substantially be divided according to the difference of the composition of coagulant and preparation method
For inorganic coagulant, four major class of organic coagulants, microorganism coagulant and compound coagulant.Inorganic coagulant: mainly there is tradition
Inorganic coagulant and two kinds of macromolecule inorganic coagulant.Traditional inorganic coagulant (such as aluminium chloride, aluminum sulfate, ferrous sulfate, trichlorine
Change iron etc.) price is lower, but that there are consumptions is big in water treatment procedure, aggregation velocity is slow, the floccule that is formed is small, corrosivity is strong
The disadvantages of, gradually by inorganic polymer flocculant (such as PB1 gene, polyaluminium sulfate PAS, bodied ferric sulfate PFS,
Poly-ferric chloride PFC etc.) it is replaced.But polymeric iron corrosivity is strong and processing water has color, is also easy to produce secondary pollution；Polymerization
Aluminium chloride handles AL in water3+Content is high, can damage to environment.
In city domestic sewage advanced treatment process, coagulation effect directly determines the difficulty or ease journey of subsequent treatment process
Degree, determines effluent water quality situation up to standard indirectly.A kind of poly- phosphorus chlorine was once disclosed in Chinese patent application 92101966.1
The manufacturing method for changing aluminium coagulant, is introduced directly into phosphate multivalent anions in aluminium polychloride, by mixing, reaction, ripe
Change and etc. obtain poly- phosphorus liquor alumini chloridi solid articles be made using solidification.The manufacturing method step is simple, it is real to be easy to
Existing industrialized production, but have the following problems: 1, reaction need to carry out under Elevated Temperature Conditions, waste of energy；When slaking reaction
Between longer, low efficiency；3, using condensation reflux unit, the device is complicated；4, raw material uses phosphate to will lead to water outlet total phosphorus inclined
It is high.
Summary of the invention
The preparation method for the efficient dephosphorization compounding coagulation agent with Circle Structure that the purpose of the present invention is to provide a kind of.
Based on above-mentioned purpose, the present invention adopts the following technical scheme: a kind of preparation method of efficient dephosphorization compounding coagulation agent,
The following steps are included:
(1) lanthanum chloride that partial size is 80 ~ 120nm is dissolved in the water, the concentration of lanthanum chloride solution is 2.1g/L；
(2) the nanoscale diatomite in powder that partial size is 80 ~ 120nm is added in lanthanum chloride solution, stirs evenly obtained colloid
Mixed liquor
(3) stirring of above-mentioned mixed liquor is added in the polymeric aluminum chlorides solution of mass concentration≤5% and forms suspension, sprayed
Mist is dry, obtains the efficient dephosphorization compounding coagulation agent that partial size is 0.4 ~ 0.6mm.
Further, in the efficient dephosphorization compounding coagulation agent each substance weight percent are as follows: aluminium polychloride 50% ~
60%, diatomite 40% ~ 50%, lanthanum chloride 0.5% ~ 1.5%, surplus are water.
Further, diatomite, lanthanum chloride are ground to partial size respectively by nano-level grinder is 80 ~ 120nm.
Further, moisture content≤5% of the efficient dephosphorization compounding coagulation agent.
Further, in step (2), diatomite is added using the method that mechanical stirring and compressed air stir
Powder, mechanical stirring rate are 450 ~ 550r/min, and it is 0.8 ~ 1.2m that compressed air, which stirs ventilatory capacity,3/(m2Min), mixing time
For 60s.
Further, in step (3), whipping process uses the method that stir of mechanical stirring and compressed air, elder generation with
450 ~ 550r/min stirs 2min, the ventilatory capacity of compressed air stirring simultaneously is 0.8 ~ 1.2m3/(m2·min)；Again with 90 ~ 110 r/
Stop after min mechanical stirring 5min, the ventilatory capacity of compressed air stirring simultaneously is 0.5 ~ 1.5m3/(m2·min)。
The aluminium polychloride is commercially available technical grade PAC solution, and alumina content >=10%, basicity is 70% ~ 90%, water
Insolubles content≤0.5%.
The SiO of the diatomite2Content >=70%, heap density >=0.5g/mL, specific surface area >=40m2/g。
The preparation method of efficient dephosphorization compounding coagulation agent provided by the invention has the advantage that
(1) the mixing mode that the present invention is stirred using mechanical stirring and compressed air, can make each compounding component
Full and uniform mixing increases product stability；
(2) present invention using first quick and back slow, speed combine agitating mode, adjust stirring rate, energy according to actual needs
It is enough to save energy consumption to greatest extent, reduce cost；
(3) product is ground into nanoscale by the present invention, is accelerated the rate of dissolution of product, is improved medicament absorption property,
Improve coagulation effect；
(4) it is wide to be applicable in PH range for efficient dephosphorization compounding coagulation agent prepared by the present invention；It is to have in 5~9 ranges in pH value
There is good coagulation effect.
The efficient dephosphorization compounding coagulation agent prepared by the above method has the advantage that
(1) the efficient dephosphorization compounding coagulation agent has special Circle Structure, is not only able to improve individually adding polymerization chlorine
Change the drawbacks such as aluminium phosphor-removing effect is bad, dosage is big, meanwhile, flocculation efficiency is improved, improves the coagulation of medicament twice
More than, phosphor-removing effect is good；
(2) the efficient dephosphorization compounding coagulation agent, is compounded by aluminium polychloride, diatomite, lanthanum chloride, and formula is simple,
Have the characteristics that efficient, safe and nontoxic, and simple production process, period are short, at low cost, can be widely applied to sewage treatment plant
Biochemical dephosphorization process strengthens or Tailwater Depth dephosphorization, wide market；
(3) the compounding coagulation agent processing sewage adsorption capacity prepared using method of the invention is strong, the alumen ustum ruler of formation
Very little big, sedimentation effect is good, can effectively reduce delivery turbidity.
(4) adding compounding coagulation agent of the invention, to be formed by floc particle big and closely knit, is easy to subsequent precipitating and mistake
Filter.
(5) compounding coagulation agent of the invention is strong to the impact resistance of raw water quality, water variation, and adaptation pH value range is wide,
Influenced by water temperature variation small, solve the problems, such as that common coagulants Various Seasonal treatment effect is unstable, and have increase it is de-
Color function.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the efficient dephosphorization compounding coagulation agent that the present invention prepares.
Specific embodiment
The following describes the present invention in detail with reference to examples.
Embodiment 1
A kind of preparation method of efficient dephosphorization compounding coagulation agent, comprising the following steps:
(1) diatomite, lanthanum chloride are ground to partial size respectively by nano-level grinder is 80 ~ 120nm；
(2) lanthanum chloride after grinding is dissolved in the water, the concentration of lanthanum chloride solution is 2.1g/L；
(3) (mechanical stirring and compressed air are stirred and be used in combination) being stirred in lanthanum chloride solution, nanoscale diatomite in powder is added,
Stirring rate is 500r/min, and it is 1.0m that compressed air, which stirs ventilatory capacity,3/(m2Min), 60s is stirred, colloid mixed liquor is made,
(4) mass concentration≤5% is added to by the way of stirring above-mentioned mixed liquor using mechanical stirring and compressed air
Polymeric aluminum chlorides solution in form suspension, whipping process are as follows: first with 500r/min stirring 2min, simultaneously compressed air stirring
Ventilatory capacity is 1.0m3/(m2·min)；Again with stopping, the ventilatory capacity of compressed air stirring simultaneously after 100 r/min mechanical stirring 5min
For 1.0m3/(m2·min)；Finally suspension is spray-dried, obtains the efficient dephosphorization compounding coagulation that partial size is 0.4 ~ 0.6mm
Agent, the effect dephosphorization compounding coagulation agent have Circle Structure: outer layer is aluminium polychloride, and internal layer is porous diatomite, diatomite hole
Interior load has lanthanum chloride；The weight percent of each substance are as follows: aluminium polychloride 55%, diatomite 40%, lanthanum chloride 1.5%, surplus
For water.
Above-mentioned aluminium polychloride uses commercially available technical grade PAC solution for raw material, alumina content >=10%, basicity 70%
~ 90%, water insoluble matter content≤0.5%.
SiO in the diatomite material of use2Content >=70%, heap density >=0.5g/mL, specific surface area >=40m2/g。
Embodiment 2
A kind of preparation method of efficient dephosphorization compounding coagulation agent, comprising the following steps:
(1) diatomite, lanthanum chloride are ground to partial size respectively by nano-level grinder is 80 ~ 120nm；
(2) lanthanum chloride after grinding is dissolved in the water, the concentration of lanthanum chloride solution is 2.1g/L；
(3) (mechanical stirring and compressed air are stirred and be used in combination) being stirred in lanthanum chloride solution, nanoscale diatomite in powder is added,
Stirring rate is 550r/min, and it is 0.8m that compressed air, which stirs ventilatory capacity,3/(m2Min), it is stirred for 60s, colloid mixing is made
Liquid
(4) mass concentration≤5% is added to by the way of stirring above-mentioned mixed liquor using mechanical stirring and compressed air
Polymeric aluminum chlorides solution in form suspension, whipping process are as follows: first with 550r/min stirring 2min, simultaneously compressed air stirring
Ventilatory capacity is 0.8m3/(m2·min)；Again with stopping, the ventilatory capacity of compressed air stirring simultaneously after 110 r/min mechanical stirring 5min
It is 0.53/(m2·min)；Finally suspension is spray-dried, obtains the efficient dephosphorization compounding coagulation agent that partial size is 0.4 ~ 0.6mm,
The efficient dephosphorization compounding coagulation agent has Circle Structure: outer layer is aluminium polychloride, and internal layer is porous diatomite, in diatomite hole
Load has lanthanum chloride；The weight percent of each substance are as follows: aluminium polychloride 50%, diatomite 45%, lanthanum chloride 0.5%, surplus are
Water.
Above-mentioned aluminium polychloride uses commercially available technical grade PAC solution for raw material, alumina content >=10%, basicity 70%
~ 90%, water insoluble matter content≤0.5%.
SiO in the diatomite material of use2Content >=70%, heap density >=0.5g/mL, specific surface area >=40m2/g。
Embodiment 3
A kind of preparation method of efficient dephosphorization compounding coagulation agent, comprising the following steps:
(1) diatomite, lanthanum chloride are ground to partial size respectively by nano-level grinder is 80 ~ 120nm；
(2) lanthanum chloride after grinding is dissolved in the water, the concentration of lanthanum chloride solution is 2.1g/L；
(3) (mechanical stirring and compressed air are stirred and be used in combination) being stirred in lanthanum chloride solution, nanoscale diatomite in powder is added,
Stirring rate is 450r/min, and it is 1.2m that compressed air, which stirs ventilatory capacity,3/(m2Min), it is stirred for 60s, colloid mixing is made
Liquid,
(4) mass concentration≤5% is added to by the way of stirring above-mentioned mixed liquor using mechanical stirring and compressed air
Polymeric aluminum chlorides solution in form suspension, whipping process are as follows: first with 450r/min stirring 2min, simultaneously compressed air stirring
Ventilatory capacity is 1.2m3/(m2·min)；Again with stopping, the ventilatory capacity of compressed air stirring simultaneously after 90 r/min mechanical stirring 5min
For 1.5m3/(m2·min)；Finally suspension is spray-dried, obtains the efficient dephosphorization compounding coagulation that partial size is 0.4 ~ 0.6mm
Agent, the efficient dephosphorization compounding coagulation agent have Circle Structure: outer layer is aluminium polychloride, and internal layer is porous diatomite, diatomite
Load has lanthanum chloride in hole；The weight percent of each substance are as follows: aluminium polychloride 58%, diatomite 40%, lanthanum chloride 1.0%, it is remaining
Amount is water.
Above-mentioned aluminium polychloride uses commercially available technical grade PAC solution for raw material, alumina content >=10%, basicity 70%
~ 90%, water insoluble matter content≤0.5%.
SiO in the diatomite material of use2Content >=70%, heap density >=0.5g/mL, specific surface area >=40m2/g。
Embodiment 4
A kind of the step of preparation method of efficient dephosphorization compounding coagulation agent, is same as Example 1, the difference is that, it is made
Standby efficient dephosphorization compounding coagulation agent out, have Circle Structure: outer layer is aluminium polychloride, and internal layer is porous diatomite, diatom
Load has lanthanum chloride in native hole；The weight percent of each substance are as follows: aluminium polychloride 50%, diatomite 49%, lanthanum chloride 0.5%,
Surplus is water.
The aluminium polychloride is commercially available technical grade PAC solution, and alumina content >=10%, basicity is 70% ~ 90%, water
Insolubles content≤0.5%.
The SiO of the diatomite2Content >=70%, heap density >=0.5g/mL, specific surface area >=40m2/g。
Comparative example 1
A kind of dephosphorization compounding coagulation agent, is formed by directly mixing by the raw material of subordinate's weight percent: aluminium polychloride 55%,
Diatomite 40%, lanthanum chloride 1.5%, surplus are water, and the dephosphorization compounding coagulation agent prepared does not have Circle Structure.
The aluminium polychloride is commercially available technical grade PAC solution, and alumina content >=10%, basicity is 70% ~ 90%, water
Insolubles content≤0.5%.The SiO of the diatomite2Content >=70%, heap density >=0.5g/mL, specific surface area >=40m2/g。
Dephosphorization experiment
Embodiment 1, embodiment 2, comparative example 1 and 2 product of comparative example are respectively applied to certain sewage treatment plant tail water depth
Dephosphorization carries out phosphor-removing effect and carries out check experiment, and removal effect is as follows:
As can be seen from the table, the phosphor-removing effect of the product of comparative example 1 is poor, this is because comparative example 1 only will be each multiple
It is simply mixed with composition, the product prepared does not have special Circle Structure；The production that embodiment 1 and embodiment 2 provide
Product have special Circle Structure, and phosphor-removing effect is good, and water outlet reaches level-one A standard.
Claims (3)
1. a kind of preparation method of efficient dephosphorization compounding coagulation agent, which comprises the following steps:
(1) lanthanum chloride that partial size is 80 ~ 120nm is dissolved in the water, the concentration of lanthanum chloride solution is 2.1g/L；
(2) partial size is added as 80 ~ 120nm's in the method for using mechanical stirring and compressed air to stir in lanthanum chloride solution
Nanoscale diatomite in powder, mechanical stirring rate are 450 ~ 550r/min, and it is 0.8 ~ 1.2m that compressed air, which stirs ventilatory capacity,3/(m2·
Min), mixing time 60s stirs evenly obtained colloid mixed liquor；
(3) stirring of above-mentioned mixed liquor is added in the polymeric aluminum chlorides solution of mass concentration≤5% and forms suspension, it is stirred
The method that Cheng Caiyong mechanical stirring and compressed air stir, first with 450 ~ 550r/min stirring 2min, simultaneously compressed air
Stirring ventilatory capacity is 0.8 ~ 1.2m3/(m2·min)；Again to stop after 90 ~ 110 r/min mechanical stirring 5min, compress sky simultaneously
Gas agitating ventilatory capacity is 0.5 ~ 1.5m3/(m2Min), it is spray-dried, it is mixed obtains the efficient dephosphorization compounding that partial size is 0.4 ~ 0.6mm
Agent is coagulated, the weight percent of each substance in the efficient dephosphorization compounding coagulation agent are as follows: aluminium polychloride 50% ~ 60%, diatomite
40% ~ 50%, lanthanum chloride 0.5% ~ 1.5%, surplus are water.
2. the preparation method of efficient dephosphorization compounding coagulation agent according to claim 1, which is characterized in that by nano-milled
It is 80 ~ 120nm that diatomite, lanthanum chloride are ground to partial size respectively by machine.
3. the preparation method of efficient dephosphorization compounding coagulation agent according to claim 2, which is characterized in that the efficient dephosphorization
Moisture content≤5% of compounding coagulation agent.
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| CN114956279A (en) * | 2022-03-18 | 2022-08-30 | 苏州科技大学 | Method for preparing lanthanide series gel coagulant and application of lanthanide series gel coagulant in deep phosphorus removal |
| CN117682645A (en) * | 2024-01-17 | 2024-03-12 | 福州市规划设计研究院集团有限公司 | Diatomite and polyaluminium silicate chloride compound sewage treatment agent and preparation method thereof |
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