Clothing, one of the basic needs, demands the growth
of textile industries worldwide, resulting in higher consumption and
pollution of water. Consequently, it requires extensive treatment of
textile effluent for environmental protection as well as reuse purposes.
Primary treatment, secondary treatment, and tertiary treatment are the
three major phases of textile wastewater treatment. Secondary treatment
under aerobic and anaerobic circumstances is carried out to decrease
BOD, COD, phenol, residual oil, and color, whereas primary treatment is
utilized to remove suspended particles, oil, grease, and gritty
materials. However, biological treatment is not fully capable of
treating water according to discharge/reuse standards. Hence, tertiary
treatment is used to remove final contaminants from the wastewater.
Adsorption is regarded as one of the most feasible processes for dye and
metal removal in consideration of cost and variation in the adsorbent.
Though membrane filtration is an efficient process, the cost of
operation limits its application. It’s unfortunate that there isn’t a
universally applicable treatment solution for textile effluents.
Therefore, the only flexible strategy is to combine several therapy
modalities. Treatment of complicated, high-strength textile wastewater
depending on pollutant load will be more successful if physical,
chemical, and biological approaches are used in tandem. Enforcement of
stringent environmental regulation policies, increasing costs and demand
for freshwater, and the rising costs and difficulties associated with
wastewater disposal are accelerating efforts toward achieving ZLD.
Additionally, research into methods for extracting useful materials from
wastewater has blossomed in recent years. As such, the purpose of this
analysis is to give a holistic overview of textile wastewater treatment
systems, with a focus on zero liquid discharge (ZLD) and efficient
resource recovery, both of which may hasten the transition to more
sustainable water management.