Color and Organic Pollutant Removal from Textile Dye Wastewaters

Abstract: An effective and efficient technology has been developed for simultaneous removal of color, organic substances and heavy metal pollutants from textile dye wastewaters. The innovative process consists of three basic steps:

  1. hydrophobic precipitation of ionic dyes by proprietary surfactants/polymers,
  2. self-association to form large size aggregates and,
  3. separation of the dye aggregates from solution by filtration/flotation.

It has been shown that an extremely high degree of color, total organic carbon and heavy metals (>98%) can be removed by the new process for most synthetic dyes in a single treatment stage. Studies with real wastewater from a textile dyeing plant in Kentucky demonstrated that the new treatment process can efficiently remove over 99% of colors and 90% of total organic carbon. The copper concentration can be reduced from 5 ppm to 30 ppb after a single stage treatment. The fundamental mechanism underlying the process have been extensively studied. It has been shown that chemical reaction, charger neutralization, and hydrophobic coagulation, etc. are all involved the process.

The new treatment process has also been used to treat the pulp and paper mill effluents to test its applicability from removal of color and organic pollutants. Also, the treatment of simulated drinking water containing color has been conducted using the new process. High degree of color removal has been achieved for both.


Part of the CAER's Internal Seminar Educational Series.

Featured Speaker: Dr. Chengliang "Charlie" Jiang
Date: January 21, 1998, 3:30p.m.


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