The PACT system for wastewater treatment

The PACT system is a process for the treatment of organic materials in wastewater streams. Zimpro Environmental Inc. purchased the patent rights to the process from DuPont, expanded the technology, and now believes that the process fits into the overall scheme of technologies used for treating organics. The PACT system is used to treat aq..

Chemical pretreatment and aerobic-anaerobic degradation of textile dye wastewater

This chapter of the book presents an overview of the research conducted in four treatment areas and provides a discussion of results obtained from the pertinent studies. The four areas include: chemical pretreatment; aerobic biological treatment; anaerobic biological treatment; and anaerobic-aerobic biological treatment in tandem. Conclus..

Use of electrochemical technology to remove color and other contaminants from textile mill effluents

Electrochemical ion generation is a proven technology for removing colour, BOD, COD, TOC, solids and heavy metals from textile mill wastewater. Wastewater from textile mills can also be treated using electrochemically added aluminium ions. Many factors must be addressed when choosing which process to implement. Whenever electrochemical io..

Ozonation

The reaction of dyes with ozone is important from the viewpoint of ozone fading of colouring matter and dye wastewater treatment. Even through the structures of dyes are often complicated, ozone fading can be explained in terms of ozone attack at the most reactive site in the molecule. This chapter of the book describes the generation of ..

Sodium borohydride dye reduction in wastewater

Wastewater treatments utilizing sodium borohydride reduction have been commercialized for the removal of various metal cations such as copper, nickel, lead, mercury and silver. These chemical reductions occur with both complexed and noncomplexed metal ca

Sulfate removal from indigo dyeing textile wastewaters

Sulfate is an important parameter especially for discharges to sewer systems. The textile industry is a major source of sulfate. Some sulfate sources in the industry have material replacement alternatives. However in some sources, sulfate or species co

Membrane filtration techniques in dyestuff recovery

During the past decade, the utilization of membrane-based separation processes has been under active development in both the textile and dyestuff industries. This particular technology has progressed to the point of producing high-quality wastewater, which either satisfactorily meets the stringent requirements for discharge or is acceptab..

Investigations on decolorization products of azo dyes by sodium sulfite

Decolorization of two azo dyes (C.I.Acid Orange 7 [1a] and C.I.Acid Orange 20 [2a] by sodium sulfite solution was pursued photometrically at 30℃. The initial decolorization products showing absorption maxima at 413nm for la and 374 nm for 2a were isolated as tetrabutylammonium ion-complexes soluble in organic solvents. The measurements o..

Technical aspects of the mass-dyeing of polyolefin fibers with organic pigments

The properties of pigments suitable for the mass-dyeing of polyethylene and polypropylene fibres are reviewed. Chemical structures of low-to-middle performance and high-performance pigments for polypropylene fibres are shown. Graphs showing the UV stability of fibres coloured with various pigments are also included. The influence of pigme..

혼방품에 활용할 수 있는 색채예측 알고리즘

선염섬유를 혼방할때 색조합이 문제가 된다. 혼방품의 색채는 Kubelka-Munk 이론으로 정확하게 예측된다고 하며, 이 이론을 바탕으로 분광광도계에 의한 칼러매칭이 보고되어 있다. 그런데 선염섬유의 경우에도 안료의 배합과 같이 우수한 칼러매칭, 저가격, 메타머리즘의 저감 등의 조건을 만족시키기 위하여 때로는 4색 이상의 혼방이 필요하다. 그러나 4색 시스템..