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Preparing method for modified wood powder amphiprotic dehydrating agent

A technology of dehydrating agent and wood powder, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc. It can solve the problems of difficult biodegradation of organic synthetic polymer flocculants, large amount of inorganic flocculants, and human health hazards, and achieve good dissolution Non-toxic, easy to degrade, and avoid secondary pollution

Inactive Publication Date: 2015-10-21
霍普科技(天津)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the amount of inorganic flocculants is large, the effect is not ideal, and metal ions will be brought into the final sludge treatment products, causing secondary pollution to the environment; organic synthetic polymer flocculants are difficult to biodegrade, and the residues are toxic. It will pollute the environment and do great harm to human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: a kind of preparation method of triethylenetetramine type dehydrating agent:

[0017] (1) Carboxymethylation reaction: take 240g of wood powder and beaker, add 140mL 95% absolute ethanol in proportion to wet the wood powder, disperse evenly, then add 240g of sodium hydroxide for 0.5h alkalization, the temperature is controlled at 50 ℃, add 240g of 3-chloropropionic acid, keep the reaction temperature, carry out the etherification reaction for 2h, and obtain the carboxyethylated product.

[0018] (2) graft copolymerization reaction: add carboxyethylated product and deionized water in there-necked flask, logical nitrogen and be heated to predetermined temperature, under uniform stirring, add 50g potassium persulfate (K 2 S 2 o 8 ) as an initiator, and 600 g of acrylamide as a reactive monomer for graft copolymerization reaction for 2.5 hours at a reaction temperature of 50° C. to obtain the graft copolymerization product CGAA.

[0019] (3) Mannich reactio...

Embodiment 2

[0021] (1) Carboxymethylation reaction: take 240g of wood powder and beaker, add 140mL 95% absolute ethanol in proportion to wet the wood powder, disperse evenly, then add 240g of sodium hydroxide for 0.5h alkalization, the temperature is controlled at 50 ℃, add 240g of 3-chloropropionic acid, keep the reaction temperature, carry out the etherification reaction for 2h, and obtain the carboxyethylated product.

[0022] (2) graft copolymerization reaction: add carboxyethylated product and deionized water in there-necked flask, logical nitrogen and be heated to predetermined temperature, under uniform stirring, add 50g potassium persulfate (K 2 S 2 o 8 ) as an initiator, and 600 g of acrylamide as a reactive monomer for graft copolymerization reaction for 2.5 hours at a reaction temperature of 50° C. to obtain the graft copolymerization product CGAA.

[0023] (3) Mannich reaction: Dissolve a certain amount of graft copolymer in deionized water, then pour it into a three-necked ...

Embodiment 3

[0025] Carry out the sludge dehydration experiment with the amphoteric sludge dehydrating agent obtained by implementing Lee 1 and 2, take 1kg of sludge, add 6g of amphoteric dehydrating agent to it, the stirring speed is 300r / min, the stirring time is 20min, and the standing time is 10min , the pH range of 6-9 has a wide application range, the use of dehydrating agent is not limited by temperature, the flocs are large, and the removal rate of water in sludge is between 81.3 and 85.4%.

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Abstract

The invention provides a preparing method for a modified wood powder amphiprotic dehydrating agent. The method is characterized by comprising the steps that dispersing treatment is carried out on wood powder, after alkalization is carried out, etherification reaction is carried out by adding a certain amount of 3-chloropropionic acid, a carboxyethylation product is obtained, graft copolymerization reaction is carried out on the carboxyethylation product and acrylamide, a graft copolymerization product is obtained, mannich reaction is further carried out on the graft copolymerization product, and the modified amphiprotic dehydrating agent is obtained. According to the amphiprotic dehydrating agent, due to the fact that the hydration effect and the electrostatic repulsion effect between particles with different sizes in sludge are lowered, the mutual structural constitution is improved, new sludge particles with appropriate sizes are formed, the sludge positive pressure dehydrating effect is achieved, the good dissoluvability is achieved, during processing of the sludge, generated flocculating constituents are big, the sedimentation is rapid, the water yield is high, and the processing efficiency of the sludge is improved. Compared with a traditional dehydrating agent, the amphiprotic dehydrating agent has the advantages that the pollution is low, the degradation is easy to carry out, the toxicity does not exist, the effect is good, the application range is wide, and the secondary pollution in the sludge processing process is avoided.

Description

technical field [0001] The invention relates to a sludge dehydrating agent, and mainly relates to a preparation method of a modified wood powder amphoteric dehydrating agent. Background technique [0002] At present, there are three mainstream technologies for sludge disposal around the world: stable landfill, land use, and incineration, and a considerable part of it is disposed of in the environment without any treatment. Among the sludge treatment and disposal methods in my country, agricultural use of sludge accounts for 44.8%, landfilling accounts for 31.0%, incineration treatment accounts for 3.5%, other treatment accounts for about 6.9%, and untreated sludge accounts for about 13.8%. High water content, large volume, and difficult to remove water are the most notable characteristics of municipal sewage plant sludge. Generally speaking, in order to reduce the water content of sludge, sludge must be dehydrated, including concentration, digestion and dehydration. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 孙浩
Owner 霍普科技(天津)股份有限公司
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