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Preparation method of pre-gelatinized starch-chitosan grafted copolymer flocculating agent for removing heavy metal ions in industrial wastewater

A technology of pregelatinized starch and graft copolymer, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., can solve problems such as low solubility and poor flocculation performance, and achieve applicability The effect of strong and excellent environmental friendliness

Inactive Publication Date: 2014-02-12
HUBEI CHUANDONG ENVIRONMENTAL ENERGY DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both starch and chitosan have the disadvantages of low solubility at room temperature and poor flocculation performance, so we usually use them after treatment to add corresponding groups to achieve the function of removing heavy metal pollutants

Method used

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  • Preparation method of pre-gelatinized starch-chitosan grafted copolymer flocculating agent for removing heavy metal ions in industrial wastewater
  • Preparation method of pre-gelatinized starch-chitosan grafted copolymer flocculating agent for removing heavy metal ions in industrial wastewater
  • Preparation method of pre-gelatinized starch-chitosan grafted copolymer flocculating agent for removing heavy metal ions in industrial wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1, pregelatinized starch: chitosan mass ratio is 2: 1, at 60°C, react for 8h when the initiator cerium ammonium nitrate amount accounts for 0.1% of the total mass, it is prepared, dried and crushed to 200 mesh spare. See Table 1 for the mass added to achieve a 50% heavy metal removal rate by decolorizing 1L of conventional textile printing and dyeing wastewater with a dye content of 1g / L.

[0021]

Embodiment 2

[0022] Embodiment two, pregelatinized starch: chitosan mass ratio is 3: 1, at 50 ℃, reaction 8h, when the amount of initiator initiator ammonium cerium nitrate accounted for 0.5% of the total mass, preparation generated, dried and crushed Up to 200 mesh for standby. See Table 2 for the mass added to 1L of industrial wastewater with a heavy metal ion content of 1g / L to achieve 75% removal of heavy metals.

[0023]

Embodiment 3

[0024] Embodiment three, pregelatinized starch: chitosan mass ratio is 4: 1, at 45 DEG C, react 8h, when initiator ceric ammonium nitrate consumption accounts for 1% of total mass, prepare generation, dry and grind to 200 Reserved. See Table 3 for the mass added to 1L of industrial wastewater with a heavy metal ion content of 1g / L to achieve 90% removal of heavy metals.

[0025]

[0026] Through above-mentioned embodiment, compared with conventional inorganic flocculant and organic flocculant, all have obvious advantages in the removal of heavy metal ion to sample waste water, the removal of suspended matter in water; Compared with pure pregelatinized starch, chitosan flocculant and Compared with PAM, the copolymer flocculant makes their respective functions better coordinated, and effectively removes common heavy metals in sample wastewater.

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Abstract

The invention relates to a pre-gelatinized starch-chitosan grafted copolymer flocculating agent and a preparation method thereof. The flocculating agent and the preparation method are characterized in that a modified starch / chitosan copolymer flocculating agent is synthesized under the conditions that pre-gelatinized starch and chitosan are utilized as raw materials, ceric ammonium nitrate is used as an initiator, and the pH (Potential of Hydrogen) is 9, wherein the mass ratio of modified starch to chitosan is (2-5): 1; the reaction temperature is 30 to 60 DEG C; the reaction lasts for 8 hours; and the initiator used accounts for 0.1 to 1% based on the total mass of the system. The pre-gelatinized starch-chitosan grafted copolymer flocculating agent prepared by the method has the characteristics of being high in effect, low in cost, able to remove heavy metal ions, and environment-friendly; and compared with the conventional flocculating agent, the pre-gelatinized starch-chitosan grafted copolymer flocculating agent enables the removal rate of heavy metals in different wastewater to reach 90% with less dose.

Description

technical field [0001] The invention relates to a flocculant for removing heavy metal ions and a preparation method thereof, in particular to a pregelatinized starch-chitosan graft graft copolymer flocculant for treating metal ions in printing and dyeing wastewater, which belongs to water treatment The field of flocculation technology. Background technique [0002] Commonly used water treatment flocculants are mainly divided into two categories: inorganic flocculants and organic flocculants. Inorganic flocculants are mainly polyaluminum chloride and polyferric chloride-based flocculants. The principle is that through the collision of coagulated solids, the hydrolyzed products are agglomerated and bridging flocculated to form settleable or filterable flocculation. substances, in order to achieve the purpose of purifying water quality. However, all inorganic flocculants have defects such as low chromaticity removal efficiency and easy metal residues that endanger human healt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/62
Inventor 郭世平喻小平徐晶晶
Owner HUBEI CHUANDONG ENVIRONMENTAL ENERGY DEV CO LTD
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