CN109851013A - A kind of method that PAC handles low temperature, low turbidity waste sewage - Google Patents
A kind of method that PAC handles low temperature, low turbidity waste sewage Download PDFInfo
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- CN109851013A CN109851013A CN201910054246.XA CN201910054246A CN109851013A CN 109851013 A CN109851013 A CN 109851013A CN 201910054246 A CN201910054246 A CN 201910054246A CN 109851013 A CN109851013 A CN 109851013A
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Abstract
The invention discloses the methods of a kind of PAC processing low temperature, low turbidity waste sewage, comprising: the pH value for adjusting treatment sewage maintains the pH value for the treatment of sewage between 6.0-9.0；The Zeolite Addition powder into treatment sewage, and 1h is stirred under water with the revolving speed of 100-150r/min；Kaolin is added into treatment sewage, and 1min is stirred under water with the revolving speed of 60r/min；Treatment sewage side is stirred below in the revolving speed of 60r/min and adds aluminium polychloride, is stood, until wadding body settles completely.The ammonia nitrogen in removable water is quickly stirred in Zeolite Addition powder and progress in treatment sewage, and increases dissolved oxygen, while improving water body total alkalinity, stabilizing water quality.Kaolin is first added to the water as flocculation aid, the effective collision probability between increase products, so that the rapid coacervation of suspended matter after aluminium polychloride investment in water, forms comparatively dense wadding body, the big sinking speed of alumen ustum quality is fast.
Description
Technical field
The invention belongs to chemical flocculation technical field of sewage, specifically, being related to a kind of PAC processing low temperature, low turbid
Spend the method for sewage.
Background technique
As Chinese Urbanization and process of industrialization are accelerated, water pollution problems becomes increasingly conspicuous, and gives people's production and living
It causes to seriously affect.Currently, the method for sewage treatment has physical method, chemical method, bioanalysis etc..Coagulation Method is chemical Treatment dirt
Important one of method, principle are that coagulated agent is added into waste water in water, keep colloid and fine suspension matter therein de-
Surely, and hundreds of microns is collected as down to several millimeters of alumen ustum, and then can be given by gravitational settling or other solid-liquid separation means
With removal.
Aluminium polychloride (Poly aluminum Chloride) code name PAC.Commonly referred to as water purification agent or coagulant, it
It is between ALCL3With AL (OH)3Between a kind of water-soluble inorganic high molecular polymer, color is in yellow or faint yellow, deep brown
Color, Dark grey resinous solid.The product has stronger bridge formation absorption property, in hydrolytic process, with generation cohesion, absorption
With precipitating etc. physical and chemical processes.The fundamental difference of aluminium polychloride and traditional inorganic coagulant is that traditional inorganic coagulant is
Low molecule crystal salt, and the structure of aluminium polychloride is made of the changeable polycarboxy complex compound of form, applicable pH value range is wide,
Non-corrosive to pipe-line equipment, purifying water effect is obvious, can effectively remove solid suspension SS in water, COD COD, biochemistry
The heavy metal ion such as oxygen demand BOD and arsenic, mercury, the product are widely used in drinking water, industrial water and sewage treatment field.
The wadding body that aluminium polychloride coagulation generates is easy to float after placing a period of time；With the reduction of water temperature, water glues
Degree increases, and wadding body forms speed and sinking speed and reduces；When in addition handling the sewage of low turbidity, the particle in flocculation process is touched
The probability hit is reduced, and influences coagulation effect.
Summary of the invention
For deficiency above-mentioned in the prior art, the present invention provides a kind of method that PAC handles low temperature, low turbidity waste sewage,
The pollutants such as ammonia nitrogen, total phosphorus, the COD in water can not only be effectively removed, moreover it is possible to accelerate flocculation settling velocity, prevent flocs float.
In order to achieve the above object, the solution that the present invention uses is: a kind of PAC processing low temperature, low turbidity waste sewage
Method includes the following steps:
(1) pH value for adjusting treatment sewage, maintains the pH value for the treatment of sewage between 6.0-9.0；
(2) the Zeolite Addition powder into treatment sewage, and 1h is stirred under water with the revolving speed of 100-150r/min；
(3) kaolin is added into treatment sewage, and 1min is stirred under water with the revolving speed of 60r/min；
(4) treatment sewage side is stirred below in the revolving speed of 60r/min and add aluminium polychloride, stood, until wadding body is complete
Bulk deposition.
Preferably, the treatment sewage is 1 DEG C -15 DEG C of temperature, and less than 100 degree, COD is not more than turbidity
100mg/L, ammonia nitrogen are not more than 6mg/L, and total phosphorus is not more than the sewage of 2mg/L.
Preferably, if the treatment sewage peracid, sodium hydroxide solution is added to treatment sewage；If to be processed
Sewage crosses alkali, then adds sulfuric acid to treatment sewage.
Preferably, the sodium hydroxide solution is the sodium hydroxide solution that mass ratio is 30%, and the sulfuric acid is body
Product is than the dilute sulfuric acid for 30%.
Preferably, the mesh number of zeolite powder described in step (2) is -200 mesh of 180 mesh, dosage 0.2-0.8g/L.
Preferably, kaolinic mesh number described in step (3) is -300 mesh of 200 mesh, dosage 0.1-0.4g/L.
Preferably, aluminium polychloride dosage described in step (4) is 0.2-0.8g/L.
Preferably, aluminium polychloride can also be dissolved into the polymeric aluminum chlorides solution that mass ratio is 5% to spray in step (4)
It is sprinkled upon in treatment sewage.
The beneficial effects of the present invention are:
(1) ammonia nitrogen in removable water is quickly stirred in Zeolite Addition powder and progress in treatment sewage, and increases dissolved oxygen,
Water body total alkalinity, stabilizing water quality are improved simultaneously.Aluminium polychloride itself cannot make wadding body fine and close, and the increase of dosage can only make
The volume of wadding body is bigger, density is smaller, moisture content is higher, and kaolin is first added to the water as flocculation aid, increases suspension in water
The concentration of grain, the effective collision probability between increase products, the rapid coacervation of suspended matter in water form comparatively dense wadding body, alum
Flower quality becomes larger, and sinking speed becomes faster, and achievees the purpose that improve coagulation effect.
(2) after handling waste water by this method, ammonia nitrogen removal frank is up to 90-95%, and the removal rate of total phosphorus is up to 90-
95%, COD removal rate settle, wadding body volume is compared with only adding same amount of PAC after alumen ustum 15min completely up to 90-95%
At least reduce 50%, and after a long time placement wadding body without floating situation.
Specific embodiment
Below in conjunction with specific embodiment, the invention will be further described:
A kind of method that PAC handles low temperature, low turbidity waste sewage, includes the following steps:
(1) pH value for adjusting treatment sewage, maintains the pH value for the treatment of sewage between 6.0-9.0.
(2) the Zeolite Addition powder into treatment sewage, and 1h is stirred under water with the revolving speed of 100-150r/min.Add boiling
Mountain flour simultaneously carries out quickly stirring the ammonia nitrogen that can remove in water, and increases dissolved oxygen, while improving water body total alkalinity, stabilizing water quality.
(3) kaolin is added into treatment sewage, and 1min is stirred under water with the revolving speed of 60r/min.Kaolin is made
First it is added to the water for flocculation aid, increases the concentration of suspended particulate in water, increases intergranular effective collision probability, so that
The rapid coacervation of suspended matter after aluminium polychloride investment in water, forms comparatively dense wadding body, alumen ustum quality becomes larger, sinking speed
It becomes faster, has achieved the purpose that improve coagulation effect.
(4) treatment sewage side is stirred below in the revolving speed of 60r/min and add aluminium polychloride, stood, until wadding body is complete
Bulk deposition, adding aluminium polychloride makes the heavy metal ion coacervations such as SS, COD, BOD and arsenic, mercury in water at wadding body, and in kaolinite
Comparatively dense wadding body, rapid subsidence are formed under the action of soil.
Preferably, the treatment sewage is 1 DEG C -15 DEG C of temperature, and less than 100 degree, COD is not more than turbidity
100mg/L, ammonia nitrogen are not more than 6mg/L, and total phosphorus is not more than the sewage of 2mg/L.
Preferably, if the treatment sewage peracid, sodium hydroxide solution is added to treatment sewage；If to be processed
Sewage crosses alkali, then adds sulfuric acid to treatment sewage.
Preferably, the sodium hydroxide solution is the sodium hydroxide solution that mass ratio is 30%, and the sulfuric acid is body
Product is than the dilute sulfuric acid for 30%.
Preferably, the mesh number of zeolite powder described in step (2) is -200 mesh of 180 mesh, dosage 0.2-0.8g/L.
Preferably, kaolinic mesh number described in step (3) is -300 mesh of 200 mesh, dosage 0.1-0.4g/L.
Preferably, aluminium polychloride dosage described in step (4) is 0.2-0.8g/L.
Preferably, aluminium polychloride can also be dissolved into the polymeric aluminum chlorides solution that mass ratio is 5% to spray in step (4)
It is sprinkled upon in treatment sewage.Aluminium polychloride is sprayed in sewage as a solution, and aluminium polychloride can be made abundant with sewage
Mixing is conducive to the heavy metal ion such as SS, COD, BOD and arsenic, the mercury in aluminium polychloride removal sewage, reaches the mesh of purification
's.
Embodiment one:
A kind of method that PAC handles low temperature, low turbidity waste sewage, sewage volume to be processed are 10L, ammonia-nitrogen content 6mg/
L, total phosphorus content 2mg/L, COD content are 100mg/L, and temperature is 1 DEG C, and turbidity is 100 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
The zeolite powder that mesh number is 200 mesh is added by the dosage of 0.8g/L, and 1h is stirred with the revolving speed of 150r/min.
The kaolin that mesh number is 300 mesh is added by the dosage of 0.4g/L, and 1min is stirred with the revolving speed of 60r/min.
Adding polyaluminium aluminium powder while stirring under the revolving speed of 60r/min, dosage 0.8g/L is stood, until
Wadding body settles completely.
Embodiment two:
A kind of method that PAC handles low temperature, low turbidity waste sewage, sewage volume to be processed are 10L, ammonia-nitrogen content 4mg/
L, total phosphorus content 1mg/L, COD content are 85mg/L, and temperature is 15 DEG C, and turbidity is 50 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
The zeolite powder that mesh number is 180 mesh is added by the dosage of 0.6g/L, and 1h is stirred with the revolving speed of 100r/min.
The kaolin that mesh number is 300 mesh is added by the dosage of 0.3g/L, and 1min is stirred with the revolving speed of 60r/min.
Adding polyaluminium aluminium powder while stirring under the revolving speed of 60r/min, dosage 0.6g/L is stood, until
Wadding body settles completely.
Embodiment three:
A kind of method that PAC handles low temperature, low turbidity waste sewage, sewage volume to be processed are 10L, ammonia-nitrogen content 5mg/
L, total phosphorus content 1mg/L, COD content are 60mg/L, and temperature is 10 DEG C, and turbidity is 90 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
The zeolite powder that mesh number is 190 mesh is added by the dosage of 0.7g/L, and 1h is stirred with the revolving speed of 120r/min.
The kaolin that mesh number is 250 mesh is added by the dosage of 0.25g/L, and 1min is stirred with the revolving speed of 60r/min.
Adding polyaluminium aluminium powder while stirring under the revolving speed of 60r/min, dosage 0.5g/L is stood, until
Wadding body settles completely.
Example IV:
The method of a kind of PAC processing low temperature, low turbidity waste sewage, the sewage volume are 10L, ammonia-nitrogen content 2mg/L, always
Phosphorus content is 0.4mg/L, and COD content is 40mg/L, and temperature is 5 DEG C, and turbidity is 60 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
The zeolite powder that mesh number is 195 mesh is added by the dosage of 0.2g/L, and 1h is stirred with the revolving speed of 120r/min.
The kaolin that mesh number is 280 mesh is added by the dosage of 0.1g/L, and 1min is stirred with the revolving speed of 60r/min.
Adding polyaluminium aluminium powder while stirring under the revolving speed of 60r/min, dosage 0.2g/L is stood, until
Wadding body settles completely.
Embodiment five:
A kind of method that PAC handles low temperature, low turbidity waste sewage, sewage volume to be processed are 10L, ammonia-nitrogen content 6mg/
L, total phosphorus content 2mg/L, COD content are 100mg/L, and temperature is 1 DEG C, and turbidity is 100 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
The zeolite powder that mesh number is 200 mesh is added by the dosage of 0.8g/L, and 1h is stirred with the revolving speed of 150r/min.
The kaolin that mesh number is 300 mesh is added by the dosage of 0.4g/L, and 1min is stirred with the revolving speed of 60r/min.
Sprinkling while stirring adds the polymeric aluminum chlorides solution that mass ratio is 5% under the revolving speed of 60r/min, and dosage is
Every liter for the treatment of sewage adds the polymeric aluminum chlorides solution that 0.8g aluminium polychloride is dissolved into, and stands, until wadding body settles completely.
Embodiment six:
A kind of method that PAC handles low temperature, low turbidity waste sewage, sewage volume to be processed are 10L, ammonia-nitrogen content 4mg/
L, total phosphorus content 1mg/L, COD content are 85mg/L, and temperature is 15 DEG C, and turbidity is 50 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
The zeolite powder that mesh number is 180 mesh is added by the dosage of 0.6g/L, and 1h is stirred with the revolving speed of 100r/min.
The kaolin that mesh number is 300 mesh is added by the dosage of 0.3g/L, and 1min is stirred with the revolving speed of 60r/min.
Sprinkling while stirring adds the polymeric aluminum chlorides solution that mass ratio is 5% under the revolving speed of 60r/min, and dosage is
Every liter for the treatment of sewage adds the polymeric aluminum chlorides solution that 0.6g aluminium polychloride is dissolved into, and stands, until wadding body settles completely.
Embodiment seven:
A kind of method that PAC handles low temperature, low turbidity waste sewage, sewage volume to be processed are 10L, ammonia-nitrogen content 5mg/
L, total phosphorus content 1mg/L, COD content are 60mg/L, and temperature is 10 DEG C, and turbidity is 90 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
The zeolite powder that mesh number is 190 mesh is added by the dosage of 0.7g/L, and 1h is stirred with the revolving speed of 120r/min.
The kaolin that mesh number is 250 mesh is added by the dosage of 0.25g/L, and 1min is stirred with the revolving speed of 60r/min.
Sprinkling while stirring adds the polymeric aluminum chlorides solution that mass ratio is 5% under the revolving speed of 60r/min, and dosage is
Every liter for the treatment of sewage adds the polymeric aluminum chlorides solution that 0.5g aluminium polychloride is dissolved into, and stands, until wadding body settles completely.
Embodiment eight:
The method of a kind of PAC processing low temperature, low turbidity waste sewage, the sewage volume are 10L, ammonia-nitrogen content 2mg/L, always
Phosphorus content is 0.4mg/L, and COD content is 40mg/L, and temperature is 5 DEG C, and turbidity is 60 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
The zeolite powder that mesh number is 195 mesh is added by the dosage of 0.2g/L, and 1h is stirred with the revolving speed of 120r/min.
The kaolin that mesh number is 280 mesh is added by the dosage of 0.1g/L, and 1min is stirred with the revolving speed of 60r/min.
Sprinkling while stirring adds the polymeric aluminum chlorides solution that mass ratio is 5% under the revolving speed of 60r/min, and dosage is
Every liter for the treatment of sewage adds the polymeric aluminum chlorides solution that 0.2g aluminium polychloride is dissolved into, and stands, until wadding body settles completely.
Comparative example one:
A kind of method that PAC handles low temperature, low turbidity waste sewage, sewage volume to be processed are 10L, ammonia-nitrogen content 6mg/
L, total phosphorus content 2mg/L, COD content are 100mg/L, and temperature is 1 DEG C, and turbidity is 100 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
Adding polyaluminium aluminium powder while stirring under the revolving speed of 60r/min, dosage 0.8g/L is stood, until
Wadding body settles completely.
Comparative example two:
A kind of method that PAC handles low temperature, low turbidity waste sewage, sewage volume to be processed are 10L, ammonia-nitrogen content 4mg/
L, total phosphorus content 1mg/L, COD content are 85mg/L, and temperature is 15 DEG C, and turbidity is 50 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
Adding polyaluminium aluminium powder while stirring under the revolving speed of 60r/min, dosage 0.6g/L is stood, until
Wadding body settles completely.
Comparative example three:
A kind of method that PAC handles low temperature, low turbidity waste sewage, sewage volume to be processed are 10L, ammonia-nitrogen content 6mg/
L, total phosphorus content 2mg/L, COD content are 100mg/L, and temperature is 1 DEG C, and turbidity is 100 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
Then sprinkling while stirring adds the polymeric aluminum chlorides solution that mass ratio is 5% under the revolving speed of 60r/min, adds
Amount is that every liter for the treatment of sewage adds the polymeric aluminum chlorides solution that 0.8g aluminium polychloride is dissolved into, and is stood, until wadding body is complete
Sedimentation.
Comparative example four:
A kind of method that PAC handles low temperature, low turbidity waste sewage, sewage volume to be processed are 10L, ammonia-nitrogen content 4mg/
L, total phosphorus content 1mg/L, COD content are 85mg/L, and temperature is 15 DEG C, and turbidity is 50 degree.
PH is adjusted first, maintains the pH value for the treatment of sewage between 6.0-9.0, and peracid can add mass ratio to be 30% hydrogen
Sodium hydroxide solution, crossing alkali can add volume ratio to be 30% dilute sulfuric acid.
Sprinkling while stirring adds the polymeric aluminum chlorides solution that mass ratio is 5% under the revolving speed of 60r/min, and dosage is
Every liter for the treatment of sewage adds the polymeric aluminum chlorides solution that 0.6g aluminium polychloride is dissolved into, and stands, until wadding body settles completely.
Experimental example 1
Water after treated the settling of floccus of embodiment one to eight is detected respectively, testing result is as shown in Table 1.
Table one
As can be seen from Table I, the method for 1-8 of the embodiment of the present invention treated water settles completely after alumen ustum 15min,
Ammonia nitrogen removal frank is up to 90-95%, and the removal rate of total phosphorus is up to 90-95%, and COD removal rate is up to 90-95%, after standing 72h
Without flocs float situation, and comparative example one to four and embodiment five to eight are it is found that using the side for spraying polyaluminium chloride solution
Formula adds throwing polyaluminium chloride more preferable relative to direct plus throwing polyaluminium chloride powder effect.
Experimental example 2
Water after embodiment one, two, five, six and comparative example one to four treated settling of floccus is detected respectively,
Testing result is as shown in Table 2.
Table two
As can be seen from Table II, using the method for the embodiment of the present invention one, two, five, six treated sewage, alumen ustum
It is settled completely after 15min, ammonia nitrogen removal frank is up to 90-95%, and for the removal rate of total phosphorus up to 90-95%, COD removal rate is reachable
Without flocs float situation after 90-95%, wadding body small volume and standing 72h；The method of comparative example one to four treated water, always
The removal rate of phosphorus is up to 90-95%, and COD removal rate is acted on up to 90-95%, but to ammonia nitrogen without any removal, and wadding body volume
Larger, standing 72h has part flocs float.
In conclusion the method for PAC processing low temperature provided in an embodiment of the present invention, low turbidity waste sewage is in treatment sewage
Zeolite Addition powder simultaneously carries out quickly stirring the ammonia nitrogen that can remove in water, and increases dissolved oxygen, while improving water body total alkalinity, stablizes water
Matter.Kaolin is first added to the water as flocculation aid, increases the concentration of suspended particulate in water, and the effective collision between increase products is several
Rate, so that the rapid coacervation of suspended matter after aluminium polychloride investment in water, forms comparatively dense wadding body, alumen ustum quality becomes
Greatly, sinking speed becomes faster, and achievees the purpose that improve coagulation effect.
A specific embodiment of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Claims (8)
1. a kind of method of PAC processing low temperature, low turbidity waste sewage, characterized by the following steps:
(1) pH value for adjusting treatment sewage, maintains the pH value for the treatment of sewage between 6.0-9.0；
(2) the Zeolite Addition powder into treatment sewage, and 1h is stirred under water with the revolving speed of 100-150r/min；
(3) kaolin is added into treatment sewage, and 1min is stirred under water with the revolving speed of 60r/min；
(4) treatment sewage side is stirred below in the revolving speed of 60r/min and add aluminium polychloride, stood, until wadding body is completely heavy
Drop.
2. the method for a kind of PAC processing low temperature according to claim 1, low turbidity waste sewage, it is characterised in that: it is described to
Handling sewage is 1 DEG C -15 DEG C of temperature, and for turbidity less than 100 degree, COD is not more than 100mg/L, and ammonia nitrogen is not more than 6mg/L,
Total phosphorus is not more than the sewage of 2mg/L.
3. the method for a kind of PAC processing low temperature according to claim 1, low turbidity waste sewage, it is characterised in that: step (1)
If treatment sewage peracid described in adds sodium hydroxide solution to treatment sewage；If treatment sewage crosses alkali, to
Treatment sewage adds sulfuric acid.
4. the method for a kind of PAC processing low temperature according to claim 3, low turbidity waste sewage, it is characterised in that: the hydrogen
Sodium hydroxide solution is the sodium hydroxide solution that mass ratio is 30%, and the sulfuric acid is the dilute sulfuric acid that volume ratio is 30%.
5. the method for a kind of PAC processing low temperature according to claim 1, low turbidity waste sewage, it is characterised in that: step (2)
Described in zeolite powder mesh number be -200 mesh of 180 mesh, dosage 0.2-0.8g/L.
6. the method for a kind of PAC processing low temperature according to claim 1, low turbidity waste sewage, it is characterised in that: step (3)
Described in kaolinic mesh number be -300 mesh of 200 mesh, dosage 0.1-0.4g/L.
7. the method for a kind of PAC processing low temperature according to claim 1, low turbidity waste sewage, it is characterised in that: step (4)
Described in aluminium polychloride dosage be 0.2-0.8g/L.
8. the method for a kind of PAC processing low temperature according to claim 7, low turbidity waste sewage, it is characterised in that: step (4)
In aluminium polychloride can also be dissolved into mass ratio be 5% polymeric aluminum chlorides solution be sprayed in treatment sewage.
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| CN114716119A (en) * | 2022-02-28 | 2022-07-08 | 中国地质大学（武汉） | Coupling treatment method for bottom sediment conditioning and pollutant resistance control |
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