Grey Water Treatment Advancements (Naturally-Physically-ChemicallyBiologically) - A Review

Abstract

Water is growingly becoming a sparse resource. About 35% reduction of water usage in residential units
can be attained with simple technology if grey-water is recycled and reused in toilet flushing and irrigation and
construction purposes. Also, it has been a vital technology in developing countries to treat and reuse industrial waste
water saving money on all levels; water-heavy-consumption-industry can reduce its consumption by 80% through
recycling processes provide benefit after reasonable return of investment period. Large and medium-scale water users
need to take measure to conserve it for an active demonstration of their concern about the global pollution and
environmental problems. This paper presents the treatment methods for greywater. Technologies used for greywater
treatment are classified into natural, physical, chemical and biological systems or a combination of all these. Usage of
physical processes solely as the main treatment method is insufficient for greywater treatment, chemical greywater
treatment processes are captivating for single household low-strength greywater treatment systems, as the irregularity in
the flow of the greywater did not affect their treatment performance. In Natural ways, constructed wetland can be
regarded as the most environmental friendly and cost-effective technology for greywater treatment and reuses. Finally,
greywater treatment methods mostly vary based on site conditions and the characteristics.