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Method for purifying seawater by taking carboxymethyl chitosan as flocculant

A carboxymethyl chitosan and seawater purification technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, seawater treatment, etc., can solve the problems of secondary pollution of water bodies, unsatisfactory, and many sediments, and achieve purification efficiency High, small dosage, simple process operation effect

Inactive Publication Date: 2010-09-22
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although natural polymer flocculants are widely used in fresh water purification treatment, there is no natural polymer flocculant and its seawater purification treatment method specially used for seawater purification at present, and the use of existing freshwater flocculants to purify seawater is often not enough. Satisfactory, the dosage is large, the sediment produced is more and it is easy to cause secondary pollution to the water body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Get 2 grams of carboxymethyl chitosan (the degree of carboxymethyl substitution is 0.75, and the degree of deacetylation is 84.4%) and 5 grams of polyferric chloride (Fe 2 o 3 Iron oxide (14%, basicity 5.4%) was dissolved in 1 liter of deionized water respectively to prepare a solution.

[0017] Take 1 liter of seawater near the coast of Tanggu, Tianjin (sea water quality parameters: turbidity is 30.2-50.5NTU, pH value is 7.49-8.14, COD Mn 2.73 ~ 4.61mg / L) into a blender, and dilute hydrochloric acid was added dropwise to adjust the pH value of seawater to 6.5.

[0018] Get the prepared 4 milliliters of polyferric chloride solution and put it into the seawater of the agitator, stir it quickly for 2 minutes at 300 rpm to produce a large amount of floc particles, then add the prepared 1 milliliter of carboxymethyl chitosan solution, and mix it with 60 Turn per minute and stir slowly for 20 minutes, and let it settle for 20 minutes. Take the supernatant to measure the t...

Embodiment 2

[0020] 1 gram of carboxymethyl chitosan (the degree of carboxymethyl substitution is 0.68, the degree of deacetylation is 78.2%) and 7 grams of polyferric chloride (Fe 2 o 3 Iron oxide (14.3%, basicity 5.8%) was dissolved in 1 liter of deionized water respectively to prepare a solution.

[0021] Take 1 liter of seawater near the coast of Tanggu, Tianjin (sea water quality parameters: turbidity is 30.2-50.5NTU, pH value is 7.49-8.14, COD Mn 2.73-4.61mg / L) into a blender, and dilute sulfuric acid was added dropwise to adjust the pH value of seawater to 5.6.

[0022] Get the prepared 2.5 milliliters of polyferric chloride solution and put it into the seawater of the agitator, stir it quickly for 2 minutes at 300 rpm, produce a large amount of floc particles, then add the prepared 3 milliliters of carboxymethyl chitosan solution, with 60 Rotate per minute and stir at a slow speed for 1 minute, then add 3 milliliters of carboxymethyl chitosan solution prepared, reduce the rotatio...

Embodiment 3

[0024] 2 grams of carboxymethyl chitosan (the degree of carboxymethyl substitution is 0.82, the degree of deacetylation is 78.2%) and 10 grams of polyferric chloride (Fe 2 o 3 14.8% iron oxide, 6.1% basicity) were respectively dissolved in 1 liter of deionized water to prepare a solution.

[0025] Take 1 liter of Tianjin Tanggu offshore seawater (sea water quality parameters: turbidity is 35.5NTU, pH value is 8.1, COD Mn 3.71mg / L) into a blender, and dilute hydrochloric acid was added dropwise to adjust the pH value of seawater to 6.7.

[0026] Get the prepared 1.5 milliliters of polyferric chloride solution and put it into the seawater of the agitator, stir it quickly for 2 minutes at 300 rpm to produce a large amount of floc particles, then add the prepared 2 milliliters of carboxymethyl chitosan solution, and then add the prepared 2 milliliters of carboxymethyl chitosan solution to 60 Rotate per minute and stir at a slow speed for 1 minute, then add 3 milliliters of carbo...

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Abstract

The invention relates to a method for purifying seawater by taking carboxymethyl chitosan as a flocculant. The method comprises the steps of: preparing water-soluble carboxymethyl chitosan (CMC) and polyferric chloride (PFC) into aqueous solution respectively; adding both the aqueous solution into the seawater one after another to obtain a mixture; precipitating the mixture after stirring; and removing the precipitate to obtain purified seawater, wherein the mass ratio of the added CMC to the PFC to the seawater is 1ton:2-2.5g:10-20g; the aqueous solution of carboxymethyl chitosan contains 2g of carboxymethyl chitosan per liter water; and the aqueous solution of the PFC contains 5-10g of the PFC per liter water respectively. The method for purifying the seawater has the advantages of simple technological operation, readily available raw material, no secondary pollution to water body and high purification efficiency. The method not only can be used for pretreating of the seawater purifying but also can be used for treating sewage water discharged after seawater utilization, and has a wide popularization and application prospect.

Description

technical field [0001] The invention relates to the direct utilization technology of seawater, in particular to a seawater purification method using a flocculant. Background technique [0002] Facing the increasingly severe situation of fresh water supply and the unique advantages of direct access to seawater, coastal cities must actively promote the application of seawater in industry and urban life. Seawater desalination and seawater direct utilization technologies have become an effective way to alleviate the shortage of freshwater resources. The primary problem facing contemporary water resources is water quality, which is a general deterioration of water quality, and sea water quality is no exception. The importance of water quality lies in the fact that water resources that do not meet certain water quality standards are useless no matter how much water is available. The deterioration of seawater quality in coastal waters not only reduces the effective water volume o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/52C02F103/08
Inventor 寇希元张雨山王静张秀芝
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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