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Novel sludge dewatering agent

A sludge dehydrating agent, a new type of technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of poor flocculation effect, poor biodegradability, large dosage, etc., and achieve high sludge dewatering performance, less The effect of dosage and wide range of application

Inactive Publication Date: 2018-08-17
东莞市顶盛环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of sludge treatment, dehydration treatment is required, and dehydration agents need to be added in this process. The current dehydration agents mainly include inorganic flocculants, organic flocculants, microbial flocculants, composite flocculants and coagulant aids, etc. However, The dosage of traditional inorganic flocculants is large, and the flocculation effect is not good. Organic flocculants have some disadvantages such as biotoxicity and poor biodegradability. However, if the dosage of coagulants is too large when used alone, it is easy to cause mud cake to increase. Although the dehydration effect of bioflocculant is better, its practical application range is limited due to some shortcomings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A new type of sludge dewatering agent, in parts by weight, weighs 20 parts of dimethyl diallyl ammonium chloride and 10 parts of acrylamide respectively, puts them into a reactor, and then adds 50 parts of 2 parts of deionized water, control the temperature in the reactor to keep 45 ℃ constant, then pass nitrogen gas for 20min, carry out deoxygenation, start stirring at a stirring rate of 200r / min, then add 2 parts of initiator, after the reaction starts, pour into the reactor Slowly add 30 parts of acrylamide aqueous solution with a mass fraction of 55% dropwise. After the dropwise addition, continue to react for 8 hours. Add absolute ethanol, stir evenly, then stop stirring, let stand for 0.5h, then filter, remove the filtrate, dry the precipitate in a vacuum freeze dryer to obtain solid dimethyl diallyl ammonium chloride and acrylamide The copolymer, then the copolymer of dimethyl diallyl ammonium chloride and acrylamide is mixed with 3 parts of cationic polyacrylami...

Embodiment 2

[0024] A new type of sludge dewatering agent, in parts by weight, weighs 15 parts of dimethyl diallyl ammonium chloride and 20 parts of acrylamide respectively, puts them into the reaction kettle, and then adds 60 parts in the reaction kettle control the temperature inside the reactor to keep 40°C constant, then pass nitrogen gas for 30min to remove oxygen, start stirring at a stirring rate of 300r / min, then add 5 parts of initiator, after the reaction starts, pour into the reactor Slowly add 45 parts of acrylamide aqueous solution with a mass fraction of 40% dropwise. After the dropwise addition, continue to react for 12 hours. Add absolute ethanol, stir evenly, then stop stirring, let it stand for 2 hours, then filter, remove the filtrate, put the precipitate in a vacuum freeze dryer to dry, and obtain solid dimethyl diallyl ammonium chloride and acrylamide Copolymer, then mix the copolymer of dimethyl diallyl ammonium chloride and acrylamide with 5 parts of cationic polyacr...

Embodiment 3

[0030] A new type of sludge dewatering agent, in parts by weight, weighs 35 parts of dimethyl diallyl ammonium chloride and 15 parts of acrylamide respectively, puts them into the reactor, and then adds 80 parts of of deionized water, control the temperature in the reactor to keep 25°C constant, then pass nitrogen gas for 10min, carry out deoxygenation, start stirring at a stirring rate of 100r / min, then add 6 parts of initiator, after the reaction starts, pour into the reactor Slowly add 60 parts of acrylamide aqueous solution with a mass fraction of 45% dropwise. After the dropwise addition, continue to react for 6 hours. Add absolute ethanol, stir evenly, then stop stirring, let stand for 1h, then filter, remove the filtrate, dry the precipitate in a vacuum freeze dryer, and obtain solid dimethyl diallyl ammonium chloride and acrylamide Copolymer, then mix the copolymer of dimethyl diallyl ammonium chloride and acrylamide with 10 parts of cationic polyacrylamide, 8 parts of...

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Abstract

The invention discloses a novel sludge dewatering agent. Weighed dimethyl diallyl ammonium chloride and acrylamide are poured into a reaction kettle, deionized water is then added into the reaction kettle, the temperature in the reaction kettle is kept constant, nitrogen is injected to remove oxygen, agitation is carried out, and initiator is then added; after reaction starts, aqueous acrylamide solution is slowly dripped; after dripping is complete, reaction continues; after reaction is complete, absolute ethyl alcohol is added into the reaction kettle; after uniform agitation, the mixture iskept still, filtration is then carried out, filtrate is removed, and precipitate is dried, so that solid copolymer is obtained; and the copolymer is then uniformly mixed with cationic polyacrylamide,aluminum salt, iron salt and coagulant aid, so that the novel sludge dewatering agent is obtained. The advantages are as follows: prepared from the components, such as the organic and inorganic flocculating agents and the coagulant aid, the compound sludge dewatering agent has high sludge dewatering property, the dosage of the added chemical is less, the application range is wide, the toxicity islow, and the novel sludge dewatering agent is environmentally friendly.

Description

technical field [0001] The invention relates to the field of sludge dewatering, in particular to a novel sludge dewatering agent. Background technique [0002] Sludge is a by-product of sewage treatment. It is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc. Its main characteristics are high water content, high organic content, and fine particles. , is in a gel-like liquid state, and it is difficult to separate solid-liquid, so most sewage treatment plants use sludge dehydrators or sludge centrifuges to separate solid-liquid to a certain extent. There are four forms of water in sludge: surface-adsorbed water, Interstitial water, capillary bound water and internally bound water, the above four kinds of water can be generally divided into two types: free water and bound water, bound water is closely combined with solid particles, has low mobility, and requires mechanical force or chemical reaction can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
CPCC02F11/14
Inventor 周文圣周文忠
Owner 东莞市顶盛环保科技有限公司