Biological Effluent Treatment

Investigation of the implementation of the ecological and economical advantageous anaerobic co-fermentation of non-avoidable organically high-loaded and/or strongly coloured concentrates from the textile finishing industry (Part 3)

The treatment of concentrates in biogas systems results in an additional energy return in the form of biogas. In comparison with waste treatment by a standard waste water processing pathway involving concentration using membrane techniques or thermal procedures, this results in a significant reduction of carbon dioxide emissions. 

 

Summary

The textile finishing industry produces large quantities of waste water contaminated with high levels of organics, which also often contain considerable dyestuffs. Treatment in municipal sewage treatment plants often leads to complications and has adverse effects on effluent and water quality. 

As part of this project, scientific research was undertaken to establish the conditions necessary for pretreating industrially separated or concentrated effluents in sludge digestor plants within sewage treatment plants. In this third project phase, these treatment options were tested and evaluated on the industrial scale. 

Results:

  • Industrial-scale research has shown that the compounds present in concentrates will decompose under anaerobic conditions in sludge digestor plants in a procedure which is more cost-effective, environmentally friendly and provides for more efficient decolouration than is possible in the aerobic environment of conventional waste water processing. 
  • It is the responsibility of the textile finishing industry to establish the composition of the products they employ. They must, in particular, determine the content of the heavy metals chrome, copper and nickel in these products. Depending on the utilisation pathway of the sludge, the sources must be identified and the contaminants eliminated. 
  • Sewage works operators must verify the proportional impact of sludge digestion and provide appropriate facilities for the monitoring, temporary storage and infeed of textile concentrates. Appropriate process monitoring and documentation must be ensured. On the basis of these results, up to 2 g of each kg of organic dry matter from textile concentrates can be processed per day in a digestor container without operational complications.

Project Participants

Implementing Institution

Dr.-Ing. Jedele und Partner GmbH

More Project Informations

Project title:  Investigation of the implementation of the ecological and economical advantageous anaerobic co-fermentation of non-avoidable organically high-loaded and/or strongly coloured concentrates from the textile finishing industry (Part 3)

Project number:  0339900

Project period:  2000 - 2003

Project region:  Germany (Baden-Württemberg)

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Source: German National Library of Science and Technology Hannover (TIB)