Method for dehydrating sludge by taking magnetic chitosan as flocculating agent
A technology of sludge dehydration and chitosan, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of poor effect and achieve simple and effective steps and good dehydration effect
Inactive Publication Date: 2018-09-04
CHENGDU UNIV OF INFORMATION TECH
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Problems solved by technology
In sludge treatment and disposal, external water and capillary water are relatively easy to remove, while the internal water of sludge particles is wrapped by sludge flocs, and the effect of direct mechanical dehydration is very poor.
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[0015] Effect of flocculant dosage on sludge dewatering performance
[0016] Take a beaker containing 100mL of sludge, add natural chitosan 0, 6, 12, 24, 36, 48, 60, 72, 84mg in turn, stir at 100-300r / min for 30-60min, and then filter with a vacuum filter , repeated three times to calculate the average moisture content.
[0017] Take a beaker with 100mL of sludge, add PAC 0, 6, 12, 24, 36, 48, 60, 72, 84mg in sequence, stir at 100-300r / min for 30-60min, then filter with a vacuum filter, repeat three times , to calculate the average moisture content.
[0018] Take a beaker with 100mL sludge, add magnetic chitosan 0, 30, 35, 40, 45, 50, 55, 60, 65mg in turn. Stir at 100-300r / min for 30-60min and then filter with a vacuum filter. Repeat three times to calculate the average moisture content.
[0019] Effect of sludge pH on sludge dewatering performance
[0020] Take a beaker containing 100mL of sludge, add 60mg of natural chitosan or PAC respectively, adjust their pH to 2, 4,...
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The invention discloses a method for dehydrating sludge by taking magnetic chitosan as a flocculating agent. The method comprises the following preparation steps: 1, preparing the magnetic chitosan: adding ammonia water into a solution of the chitosan and Fe3O4 slowly and dropwisely, enabling the pH value to be between 9 and 10, performing constant-temperature reaction for 5 to 10 minutes under the condition that the water bath temperature is 40 to 70 DEG C, repeatedly washing the precipitate with distilled water until the pH value is 7, placing into water bath with the temperature of 40 to 70DEG C, drying by distillation to obtain the magnetic chitosan, and grinding into powder for future use; and 2, adding the magnetic chitosan into the sludge, stirring for 30 to 60 minutes, adding an alkaline solution or an acidic solution in the stirring process to adjust the pH value to 6 to 10, and performing suction filtration by a vacuum suction filter. The magnetic chitosan serves as the flocculating agent for sludge dehydration, and the dehydration effect is good.
Description
technical field [0001] The invention specifically relates to a sludge dewatering method using magnetic chitosan as a flocculant. Background technique [0002] The sludge produced by urban sewage treatment plants in the sewage treatment process has a high water content and is difficult to treat, and the water content often reaches more than 95%. Sludge reduction should remove as much water as possible and concentrate the sludge particles to the final needs. Processed mud cake. In sludge treatment and disposal, external water and capillary water are relatively easy to remove, while the internal water of sludge particles is wrapped by sludge flocs, and the effect of direct mechanical dehydration is very poor. Contents of the invention [0003] In view of the problems in the above-mentioned background technology, the present invention aims to provide a sludge dewatering method utilizing magnetic chitosan as a flocculant. [0004] For this reason, the present invention adopts...
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IPC IPC(8): C02F11/14
CPCC02F11/14
Inventor 郭俊元郭子豪甘鹏飞韦靖何山江世林陈诚周禺伶
Owner CHENGDU UNIV OF INFORMATION TECH