A kind of preparation method of regenerated water decolorizing agent

A technology of decolorizing agent and reclaimed water, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems that the chromaticity of the effluent supplied to users is difficult to meet the standard requirements, the composition of the influent is complex, and the production procedures are complicated, etc., and achieve good decolorization effect and decolorization. The effect is remarkable and the production process is simple

Active Publication Date: 2015-11-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current reclaimed water treatment process, due to the complex composition of the influent water, which contains certain chemical substances, the color of the influent water is too high
For these chemical substances, after using the traditional reclaimed water treatment process, the color of the effluent supplied to users is difficult to meet the standard requirements
In the past, the research and development of decolorizing agents in water treatment seldom focused on reclaimed water, and the currently commonly used decolorizing agents have disadvantages such as complicated production procedures, high cost, and small flocs formed in the flocculation stage, which are difficult to clarify.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 7 parts by mass of formaldehyde, 8.5 parts by mass of dicyandiamide, 5.5 parts by mass of ammonium chloride and 20 parts by mass of water into the reactor, stir and dissolve, so that the agents are fully mixed. Then the reactor was heated to 70° C. and reacted for 3 hours. After the reaction is finished, the obtained decolorizing agent is cooled to room temperature and packed into barrels.

[0022] Calculated based on a solid content of 60%, the preparation cost of the decolorizing agent in this method is about 3800 yuan / ton. When the chromaticity of the influent water of the reclaimed water plant is 120 degrees, and the ratio of the dosage of the decolorizer to the influent flow rate is 0.1mL / L, the sedimentation tank The chromaticity of the water outlet is reduced to 40 degrees.

Embodiment 2

[0024] Add 8 parts by mass of formaldehyde, 8.5 parts by mass of dicyandiamide, 4 parts by mass of ammonium chloride and 26 parts by mass of water into the reactor, stir and dissolve, so that the agents are fully mixed. Then the reactor was heated to 75° C. and reacted for 3 hours. After the reaction is finished, the obtained decolorizing agent is cooled to room temperature and packed into barrels.

[0025] Calculated on the basis that the solid content is 60%, the preparation cost of the decolorizing agent in this method is about 3900 yuan / ton. When the chromaticity of the influent water of the reclaimed water plant is 120 degrees, and the ratio of the dosage of the decolorizer to the influent flow rate is 0.1mL / L, the sedimentation tank The chromaticity of the water outlet is reduced to 55 degrees.

Embodiment 3

[0027] Add 8.7 parts by mass of formaldehyde, 8.5 parts by mass of dicyandiamide, 4 parts by mass of ammonium chloride and 23 parts by mass of water into the reactor, stir and dissolve, so that the agents are fully mixed. Then the reactor was heated to 80° C. and reacted for 3 hours. After the reaction is finished, the obtained decolorizing agent is cooled to room temperature and packed into barrels.

[0028] Calculated on the basis that the solid content is 60%, the preparation cost of the decolorizing agent in this method is about 3900 yuan / ton. When the chromaticity of the influent water of the reclaimed water plant is 120 degrees, and the ratio of the dosage of the decolorizer to the influent flow rate is 0.1mL / L, the sedimentation tank The chromaticity of the water outlet is reduced to 50 degrees.

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PUM

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Abstract

The invention discloses a method for preparing a recycled water decolorizing agent. The method comprises the following steps: by adopting an one-step process, adding the following components in parts by mass into a reactor: 6-9 parts of formaldehyde, 8-9 parts of dicyandiamide, 4-8 parts of ammonium chloride and 18-30 parts of water, uniformly stirring and mixing, heating to 70-80 DEG C, reacting for 2.5-3 hours, cooling to room temperature to obtain the recycled water decolorizing agent. The method disclosed by the invention has the advantages that the problem that an ideal recycled water decolorizing agent lacks at present is solved and the obtained decolorizing agent is remarkable in decolorizing effect; compared with the existing decolorizing agents, the obtained decolorizing agent has the advantages that the preparation process is simpler, the precipitation property of producing floccule is more excellent and the flocculation cost is reduced; the method can be combined with existing treatment processes of water works and is wide in applicability; the obtained decolorizing agent is simple in preparation process and rapid in decolorizing process, so that the method has a positive significance on colority emergency treatment of the water works.

Description

technical field [0001] The invention relates to recycled water treatment, in particular to a preparation method of an organic flocculation decolorizing agent. Background technique [0002] The use of reclaimed water is of great significance to solving the contradiction between urban water supply and demand and saving traditional water resources. Therefore, as a new water source, it is increasingly valued by people. However, in the current reclaimed water treatment process, due to the complex composition of the influent water, certain chemical substances contained in it lead to excessive color of the influent water. For these chemical substances, after using the traditional reclaimed water treatment process, it is difficult for the color of the effluent supplied to users to meet the standard requirements. In the past, the development of decolorizing agents in water treatment seldom focused on reclaimed water as the research object, and the currently commonly used decolorizin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/54
Inventor 李想田一梅韩漪
Owner TIANJIN UNIV
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