CN102190746B

CN102190746B - Method for preparing modified flocculant for dehydrating sludge

Info

Publication number: CN102190746B
Application number: CN2010101316253A
Authority: CN
Inventors: 郑立庆; 崔红帅; 王学锋; 皮运清; 朱桂芬
Original assignee: Henan Normal University
Current assignee: Henan Normal University
Priority date: 2010-03-17
Filing date: 2010-03-17
Publication date: 2012-10-31
Anticipated expiration: 2030-03-17
Also published as: CN102190746A

Abstract

The invention discloses a method for preparing a modified flocculant for dehydrating sludge, which comprises the following steps of: pouring 8.5 parts of acrylamide into a flask with four necks, adding 85 parts of water, stirring, introducing high pressure nitrogen for 10 minutes, and dripping 0.5 to 0.8 part of ammonia water; heating, adding 0.8 to 1.5 parts of reduced iron powder, 5 to 10 parts of aluminum chloride solution and 0.5 to 1 part of an initiator of potassium peroxydisulfate when the temperature is 50 to 60DEG C, making a mass ratio of the reduced iron powder to the aluminum chloride 1:1-2:1, regulating the PH value to be 7-9 by using 0.1mol/L sulfuric acid and 0.1mol/L aqueous solution of sodium hydroxide, and reacting at the temperature of not higher than 70DEG C for 4 hours at a stirring speed of 99rpm; and naturally cooling, curing for 8 hours in a vacuum drying oven with temperature of lower than 100DEG C, and grinding into powder to obtain the modified flocculant. The modified flocculant has advantages of inorganic and organic flocculants, is high-efficiency and cheap, is suitable for flocculation in sewage treatment and sludge dehydration flocculation treatment, is little influenced by temperature, wide in PH value application range, and stable in performance without pollution.

Description

A kind of preparation method of sludge dewatering modified flocculant

Technical field:

The present invention relates to the processing of mud, particularly a kind of preparation method who is applicable to the sludge dewatering modified flocculant that sludge dewatering is used.

Background technology:

Traditional sewage water treatment method has also produced a large amount of excess sludges when solving the water pollution.At present the disposal options of excess sludge is had multiplely,, no matter adopt which kind of disposal options, all must carry out processed, with the volume that reduces it, be convenient to storage and transportation mud like landfill, burning and compost etc.Because the particle of excess sludge is tiny, be cotton-shaped and gel-like texture, high, the difficult dehydration of water cut must add high performance flocculation agent in treating processes.Flocculation agent comprises organic and inorganic and compound; Though use organic floculant to have the good advantage of dehydrating effect, but cost is higher, and can not reduces the compressibility of mud; Residual contamination is big; Composite coagulant also has good dehydrating effect, but little to filtration velocity raising effect, and Applicable temperature and pH value narrow range, is difficult to widespread use.

Summary of the invention:

The preparation method who the purpose of this invention is to provide the sludge dewatering modified flocculant that a kind of technology is simple, with low cost, dehydrating effect is good, residual contaminants is few.

Technical solution of the present invention is accomplished as follows; A kind of preparation method of sludge dewatering modified flocculant; It is characterized in that: it includes following composition by weight, and 8.5 parts of acrylic amides, initiator potassium persulfate 0.5-1 part, reduced iron powder 0.8-1.5 part, concentration are that aluminum chloride aqueous solution 5-10 part of 20-30%, sulfuric acid and sodium hydroxide solution that concentration is 0.1mol/L are an amount of, ammoniacal liquor 0.5-0.8 part; Its preparation method is: (1) is poured 8.5 parts of acrylic amides in the four-hole beaker into; The water that adds 85 parts stirs again, makes it abundant dissolving, feeds high pressure nitrogen then 10 minutes; To remove dissolved oxygen, the ammoniacal liquor that in feeding the nitrogen process, in solution, splashes into 0.5-0.8 part; (2) above-mentioned solution is heated, in the time of 50-60 ℃, add 0.8-1.5 part reduced iron powder; 5-10 part liquor alumini chloridi; And initiator potassium persulfate 0.5-1 part, making reduced iron powder and aluminum chloride quality proportioning is 1: 1-2: 1, regulate pH value in the scope of 7-9 with the aqueous sodium hydroxide solution of 0.1mol/L sulfuric acid and same concentration simultaneously; Temperature is not more than 70 ℃, and stirring velocity is to react 4 hours under the PM 90 commentaries on classics conditions; (3) stop heating and stir after, naturally cooling less than the dried case matured of 100 ℃ vacuum 8 hours, promptly obtains the block colloid of faint yellow transparent homogeneous, grinding to form powdery promptly is this modified flocculant.This product has concurrently inorganic and advantage organic floculant, and is efficiently cheap, is applicable to flocculation and sludge dewatering flocculation treatment in the WWT, and temperature influence is little, pH value is applied widely, and stable performance is pollution-free.

Embodiment:

Embodiment 1, takes by weighing acrylic amide 8.5g, pours in the four-hole beaker; Add 85g water again and stir, make it abundant dissolving, fed high pressure nitrogen then 10 minutes; To remove dissolved oxygen, in feeding the nitrogen process, in solution, splash into 0.5-0.8g ammoniacal liquor, heat then; In the time of 50-60 ℃, add the reduced iron powder of 0.8-1.5g, 5-10g concentration is the 20-30g liquor alumini chloridi, and Potassium Persulphate 0.5-1 part; The quality proportioning that makes reduced iron powder and aluminum chloride is 1: 1.5, use the sulfuric acid of 0.1mol/L simultaneously and with the pH value of the aqueous sodium hydroxide solution regulation system of isoconcentration in the scope of 7-9; The temperature of constant reaction system is no more than 70 ℃; The control stirring velocity was reacted 4 hours under 90 rev/mins of situation, stopped heating and stirring; Naturally cooling reduces viscosity and rheological property; In the dried case of vacuum, less than slaking under 100 ℃ of conditions 8 hours, obtain block faint yellow transparent homogeneous phase colloid, it is subsequent use to pulverize.

Embodiment 2: its preparation method is with embodiment 1, and just the quality proportioning with reduced iron powder and aluminum chloride is 2: 1.

Press the mass ratio of composition preparation, the higher limit of aluminum chloride is the saturation value under this condition, and lower value is a Schwellenwert of the present invention.The adding of reduced iron powder can produce more Fe-OH, increase the hydrogen bond number in product, increase the polymerization degree, control Fe-AI ³⁺The quality proportioning be arranged on 1: 1-2: the 1st, in order to guarantee in the product effectively aluminium content, be beneficial to speed of response simultaneously.Modified flocculant of the present invention under equal conditions to the contrast that makes an experiment of dewatering performance of sludge and traditional flocculant, seems excellent more.During experiment, get sewage plant excess sludge, at room temperature carry out; Mud sample is placed the 100ml beaker; Add in the mud to be measured with 200mg/L, 300mg/L, 350mg/L, 400mg/L respectively, stirred 2 minutes fast earlier, stirred at a slow speed then 1 minute with whisking appliance; Leave standstill and measure mud resistivity and water ratio after 20 minutes, the result sees the following form:

Modification PAM of the present invention and traditional flocculant effect comparison

Claims

1. the preparation method of a sludge dewatering modified flocculant; It is characterized in that: it includes following composition by weight, and 8.5 parts of acrylic amides, initiator potassium persulfate 0.5-1 part, reduced iron powder 0.8-1.5 part, concentration are that aluminum chloride aqueous solution 5-10 part of 20-30%, sulfuric acid and sodium hydroxide solution that concentration is 0.1mol/L are an amount of, ammoniacal liquor 0.5-0.8 part; Its preparation method is: (1) is poured 8.5 parts of acrylic amides in the four-hole beaker into; The water that adds 85 parts stirs again, makes it abundant dissolving, feeds high pressure nitrogen then 10 minutes; To remove dissolved oxygen, the ammoniacal liquor that in feeding the nitrogen process, in solution, splashes into 0.5-0.8 part; (2) above-mentioned solution is heated, in the time of 50-60 ℃, add 0.8-1.5 part reduced iron powder; 5-10 part liquor alumini chloridi; And initiator potassium persulfate 0.5-1 part, making reduced iron powder and aluminum chloride quality proportioning is 1: 1-2: 1, regulate pH value in the scope of 7-9 with the aqueous sodium hydroxide solution of 0.1mol/L sulfuric acid and same concentration simultaneously; Temperature is not more than 70 ℃, and stirring velocity is to react 4 hours under the PM 90 commentaries on classics conditions; (3) stop heating and stir after, naturally cooling less than the dried case matured of 100 ℃ vacuum 8 hours, promptly obtains the block colloid of faint yellow transparent homogeneous, grinding to form powdery promptly is this modified flocculant.