The conventional production processes of the textile industry make it one of the major consumers of water and one of the most polluting industrial sectors in the world. It’s estimated that processing one kilogram of fibre (not just cotton, but also polyester and other materials) requires 100 - 150 litres of water. The industry uses about 10 000 different dyes and 10 - 15 % of these dyes discharged as untreated production waste water to rivers. This creates serious pollution to aqueous ecosystems due to a wide range of pollutants including organic and toxic substances, heavy metals and inorganic compounds.
It is not just the conventional production processes that pose a sustainable environmental problem for the textile industry but also the linear manufacturing way in which it operates. The linear value chain: clothes are produced and only used for a short period of time, then sent to landfills where the decomposing textile wastes generate greenhouse gases and thus air pollution. Incineration of these solid waste also pose many negative environmental issues.
A new textile economy based on the principles of a circular economy is of the utmost importance and Sinowatek wants to add value to this new direction in the industry.
We evaluate each client's challenge individually by using the
TEXTILE MILL WASTE WATER AND SLUDGE
A huge amount of effluent is generated in the various processes such as sizing, scouring, bleaching, mercerizing, dyeing, printing, and finishing The contaminants in the effluent are colloidal elements and dissolved organic matter, which contain mainly by-products, residual dye, salts, acid/alkali, auxiliary chemicals, and cleaning solvents. Dye bath effluents contain high colour, heavy metals, ammonia, alkali salts and large amount of other pigments which are toxic and has to be removed before discharging the effluent into the aqueous ecosystem.
Textile sludge which is an inevitable solid waste from the waste treatment processes is categorized under toxic substances.
ANALYSIS AND RESEARCH
It is impossible to develop a realistic concept for an effective treatment process for the waste water because of the extreme variety of textile processes and products. Therefore detailed analysis of the actual situation in the textile plants is non-negotiable. Research and tests in the PCD test facility is also necessary before decisions can be made on the required sludge processing.
SEPARATION AND TREATMENT TECHNOLOGY
Electro-coagulation is one of the energy efficient and environmentally friendly technology applications that Sinowatek can use to treat industrial textile dyeing waste water. This treatment method eliminates dye contamination in the most efficient manner, both from a technical and economic point of view.
DISINFECTION OF THE LIQUID
If the client wants to release the water, store the process water for long periods or use it as drinking water the treated water should be disinfected. Sinowatek can disinfect the water with the environmentally friendly Innowatech Anolyte® disinfectant - tradename Sulafect.
The solid fraction still in a viscous form (sludge) can be dried by the progressive Pulse Combustion Drying (PCD) technology into a powder. This drying method is best suited, because the energy efficiency of the drying method is significantly (up to 50%) better than its nearest rival and it also ensure that no microbial activity will take place during storage and transportation on an industrial scale.
CIRCULAR ECONOMY OUTPUT
The dried powder can be used in the construction industry but more research is needed in this regard.
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