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Chemical oxygen demand (CDO) removal powder mixture

A mixture and powder technology, applied in the field of COD removal solution, can solve the problems of powdered activated carbon insolubility, powdered activated carbon dust, etc.

Inactive Publication Date: 2018-12-11
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] While both inorganic and organic coagulants are readily soluble in water, powdered activated carbon is insoluble
Powdered activated carbon also has serious dusting problems and must be dispersed in water before being added to the wastewater stream during processing

Method used

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  • Chemical oxygen demand (CDO) removal powder mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The following powdered COD removal mixtures (Table 1) were prepared by mixing the different component powders using a ribbon blender.

[0082] Table 1: COD Removal Mixtures

[0083] components

[0084] The resulting COD removal mixture was a free flowing powder.

Embodiment 2

[0086] The following COD removal mixtures (Table 2) were prepared by mixing the different component powders using a ribbon blender.

[0087] Table 2: COD Removal Mixtures

[0088] components

[0089] The resulting COD removal mixture was a free flowing powder.

Embodiment 3

[0091] Jar testing process:

[0092] A 5% solution of the COD removal mixture in water was added to the industrial wastewater, followed by rapid mixing in a rapid mixing chamber to completely dissolve the COD removal mixture in water. In addition, 1 min after the COD removal mixture and 30 min before the slow mixing phase, a 0.2% solution of anionic polyacrylamide was added to the reaction mixture as a flocculant. To simulate a flocculation pond, continue mixing more slowly for 5 minutes to 10 minutes to allow the floc particles to aggregate. After complete cessation of mixing, the reaction mixture was allowed to settle as it was in a settling tank. Use the supernatant to determine the COD content.

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Abstract

The invention relates to a COD removal mixture which comprises a) at least one inorganic flocculant, b) at least one organic flocculant; and c) activated carbon, wherein the mixture is powder.

Description

technical field [0001] The present invention relates to chemical oxygen demand (COD) removal mixtures as powders and the use of these COD removal mixtures for the preparation of COD removal solutions for the purification of industrial wastewater, especially those obtained after biological treatment. Background technique [0002] Chemical oxygen demand (COD) is an important parameter of wastewater and is highly regulated. Wastewater originating from various industries (eg coking, paper or chemical industries) usually strives to meet increasingly stringent COD regulations after conventional biological treatment. Various advanced treatment methods can be used, such as ozonation, Fenton oxidation and membrane technology. These methods generally involve large capital investments in equipment and high operating costs. [0003] After biological treatment, the total COD of wastewater comes from the following components: suspended solids, soluble macromolecules and small organic mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F1/28C02F1/52C02F1/56
CPCC02F1/00C02F1/283C02F1/5236C02F1/56C02F2209/08C02F1/5245C02F1/5272C02F1/54C02F2103/24C02F2103/28C02F2103/365C02F2103/38
Inventor 金宁
Owner ECOLAB USA INC