Textile Industry

Textiles, one of the major industries in the world consists of numerousprocesses like spinning, weaving, dyeing, singeing, and scouring. The dyeing process specifically is extremely water intensive. Roughly about 200 L of water is used to produce 1 kg of textile.

Depending on the type of fibre used -cellulose, protein or synthetic, various kinds of dyes areconsumed. They include reactive, direct, napthol, indigo, acid, lanaset, disperse dyes etc. Thus, the key challenge in setting up a treatment process is to be able to handle all these different dyes. Besides dyes, the waste water produced also contains trace metals such as Cr, As, Cu and Zn which are capable of harming the environment and human health.

If left incorrectly treated, thetextile waste water can cause haemorrhage, ulceration of skin, nausea, skin irritation and dermatitis. The chemicals present in the water block the sunlight and increase the biological oxygen demand thereby inhibiting photosynthesis and reoxygenation process.

The effluent water discharged from the textile industries undergoes various physio-chemical processes such as flocculation, and coagulation followed by biological treatments for the removal of nitrogen, organics, phosphorous and metal.The whole treatment process involves three steps:

1. Primary treatment / Physio-chemical treatment

1. The primary treatment involves removal of suspended solids, oil and grease, and gritty materials.
2. Recommended process: – Dissolved air flotation (DAF)

2. Secondary treatment / Biological treatment

1. The secondary treatment is carried out by microorganisms under aerobic or anaerobic conditions and involves the reduction of BOD, COD and nutrients present in the water.
2. Recommended process: – Membrane bioreactor (MBR)

3. Tertiary treatment

1. The tertiary treatment involves the use of filtration process, ultrafiltration (UF), reverse osmosis (RO) and ion exchange to remove the final contaminants in the wastewater.
2. Recommended process: – Reverse osmosis (RO)

4. Zero liquid discharge

1. Evaporator (PFET) and Crystallizer (MEE) are used further to treat the reject of tertiary treatment.
2. Recommended process: – Polymeric film evaporation technology (PFET)
   At the end of all these processes we are able to get approximately 90% of pure water from the effluent fed. Arvind Envisol has a vast experience and installation base in the textile industry and a thorough knowledge of its various manufacturing processes and also its requirement for uninterrupted water supply.

At the end of all these processes we are able to get approximately 90% of pure water from the effluent fed. Arvind Envisol has a vast experience and installation base in the textile industry and a thorough knowledge of its various manufacturing processes and also its requirement for uninterrupted water supply.