A variety of technologies are available for removing synthetic dyes from water and wastewater to reduce their environmental impacts, such as sedimentation, filtration technology, oxidation, membrane isolation, electrocoagulation, advanced activated process, biodegradation, adsorption, and ion exchange.Membrane filtration water treatment is often used as a separation method in water purification systems. Membrane filters can, for instance, prevent the formation and spread of bacteria and viruses, but also remove particles like TSS, turbidity and sediment from water. A wide range of different membrane filtration products also ensures that the best possible solution is available for each particular application.

Dear Md Saifur Rahman ,

Most dyes used in textile industries are soluble and will pass through UF membranes. Only NF/RO membranes could retain soluble dyes but these will irreversible foul these delicate membranes which can't be backwashed as opposed to UF ones. Hence this would not be a sustainable and economic solution.

Instead we remove most dyes by our AS+™ advanced activated sludge biotreatment as tested in 20 large textile industries in Bangladesh. AS+™ uses our proven capture-crack-convert-regenerate biotechnology combined with reductive and oxidative steps to remove recalcitrant organics such as dyes. More on https://www.modelengineering.eu/circulate_water

Dear Md Saifur Rahman ,

Membrane technology uses a porous or non-porous filter to separate particles from the size of Na+ ions to bigger molecules. The filter is called a membrane and the most of time it is similar to an A4 paper with micro to nano scale pores on its surface.

The mechanism of separation is different based on the type of the membrane process. For example, the filter can separate the particles because they are bigger than the size of the pores on its surface. Or, the filter can separate them because of electrostatic repulsion. Dye molecules are very small and most of them have cationic or anionic functional groups. Nanofiltration is a membrane technology that separates particles by both 1- sieving based on particles' sizes and 2- ionic charge and is one of the options. It is worth noting that Nanofiltration is pressure-based and high-pressure polluted water is passed from its surface.

Best wishes

Foroogh

In water purification systems, membrane filtration is frequently utilized as a separation technique. Membrane filters, for example, may remove sediment, TSS, and turbidity from water as well as stop the growth and spread of germs and viruses.

yup ...membran tecnology is efective to separate dyies by cacth the nanoparticles in solution