Acidic chemical wastewater pretreating agent and preparation method thereof

A pretreatment agent, acid wastewater technology, applied in the direction of neutralization water/sewage treatment, etc., can solve the problems of high concentration of toxic and refractory organics, deterioration of pretreatment effect, and impact of biochemical treatment, to increase the absolute value of BOD, improve biochemical treatment, etc. Biochemical, low treatment cost effect

Inactive Publication Date: 2009-10-21
HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice shows that this method is poor in impact load resistance, and the residues such as gypsum and calcium chloride produced by the reaction are insoluble in water and can easily cover the surface of the filter material, resulting in deterioration of the pretreatment effect
In addition, in the pretreatment process of the filter material, in addition to a small amount of adsorption, the concentration of toxic and refractory organic substances in the wastewater is still high, which will cause extremely adverse effects on the subsequent biochemical treatment

Method used

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  • Acidic chemical wastewater pretreating agent and preparation method thereof
  • Acidic chemical wastewater pretreating agent and preparation method thereof
  • Acidic chemical wastewater pretreating agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A 500 ml reaction container was placed on a magnetic stirrer, 50 parts by weight of water was put in, and the magnetic stirrer was started, and the temperature of the container was raised to 50°C-60°C. Dissolve 30 parts by weight of sodium hydroxide in the 50 parts by weight of water, slowly add 2 parts by weight of sodium metaaluminate and 3 parts by weight of sodium nitrite while stirring, and add 5 parts by weight of Hangzhou The production waste of Jisheng Seed Breeding Co., Ltd., wherein the starch content in the waste is 12%, the cellulose content is 10%, and the stirring is continued for 30-50 minutes to obtain the described pretreatment agent. The appearance of the product is light yellow liquid, the pH range is 13.5-13.8, and the viscosity range is 1.0-1.5.

Embodiment 2

[0038] A 500 ml reaction vessel was placed on a magnetic stirrer, 57 parts by weight of water was put in, and the magnetic stirrer was started, and the temperature of the vessel was raised to 50°C-60°C. Dissolve 33 parts by weight of sodium hydroxide in the water, slowly add 2 parts by weight of sodium metaaluminate and 3 parts by weight of sodium nitrite while stirring, and add 5 parts by weight of winery production waste after completely dissolving , the starch content is 17-23%, and the stirring is continued for 30-50 minutes to obtain the pretreatment agent. The appearance of the pretreatment agent is a light yellow liquid with a viscosity of 1.0-1.5 and a stable time of more than half a year at room temperature and pressure.

Embodiment 3

[0046] A 500 ml reaction vessel was placed on a magnetic stirrer, 57 parts by weight of water was put in, and the magnetic stirrer was started, and the temperature of the vessel was raised to 50°C-60°C. Dissolve 31 parts by weight of sodium hydroxide in water, slowly add 3 parts by weight of sodium metaaluminate and 4 parts by weight of sodium nitrite while stirring, and add 5 parts by weight of Xiao Distillery after completely dissolving The waste material, whose starch content is 17-23%, is stirred continuously for 30-50 minutes to obtain the pretreatment agent. The appearance of the pretreatment agent is a light yellow liquid with a viscosity of 1.0-1.5 and a stable time of more than half a year at room temperature and pressure.

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Abstract

The invention relates to an acidic chemical wastewater pretreating agent and a preparation method thereof, and also relates to application of the pretreating agent in pretreating acidic chemical wastewater before biochemistry. The pretreating agent can well adjust the pH value of the acidic chemical wastewater, and improve the structure of organic pollutants in water bodies and the biodegradability of sewage so as to guarantee the processing effect of subsequent biochemistry.

Description

technical field [0001] The invention relates to an acidic wastewater treatment agent and a preparation method thereof, in particular to a pretreatment agent for acidic chemical wastewater and a preparation method thereof. Background technique [0002] In the production process of the chemical industry, a large amount of acidic wastewater (including hydrochloric acid, sulfuric acid, nitric acid or organic acid) is produced, and the wastewater often contains a large amount of toxic and refractory organic matter. If the waste water is not recycled and treated, it will not only corrode the pipes and structures, but also pollute the receiving water body if it is directly discharged into the sewer. At present, the treatment methods for this kind of wastewater mostly adopt the treatment process of physicochemical + biochemical, that is, the chemical wastewater is neutralized and mixed with other wastewater for biochemical treatment. In actual production, common physical and chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66
Inventor 刘维屏童少平朱显跃
Owner HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION
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