Grey Water Case Study

Abstract: : Greywater is the stream of waste water that is obtained from the drains of domestic household generated from washbasins, bathrooms, laundry, cleaning and sometimes may include wastewater from kitchen. Greywater is considered as an viable option for reuse as the pollution load is less and is much economically feasible to treat the water.Hence a comprehensive review has been made An estimated 40-80% of wastewater is in the form of greywater which contributes up to 20-30% of savings on fresh water sources on being reclaimed and reused. The nitrogen and phosphorous content is much lower as compared to the domestic sewage with a higher COD to BOD ratio. Grey water also shows presence of pathogens as well as fecal contaminants. Various
Recycled grey water will be considered fit for consumption only if it meets the following considerations of hygiene safety, aesthetics, environmental tolerance and economic feasibility (Nolde 1999; Winward et al., 2008; Li et al., 2009). Recycling grey water for reuse is considered feasible as it consists of majority of the volume but a much lower organic content, which is presently mainly in toilet flushings (Pidou et al., 2008). Grey water reuse has a growing scope in developing countries as it can be considered as a viable alternative source which would lessen the stress on sensitive water sources, and can be used for a variety of applications (Godfrey et al., 2009). It is believed that about 30% of fresh water consumed by domestic users can be saved by reuse of grey water considering reuse for both flushing and garden use (Eriksson et al., 2002; Christova-Boal et al., 1996). A review of the generation rates and characteristics from the available literature along with the analysis of the current
The treatment methods and efficiencies depend on these characteristics. The characteristic of grey water depends on the source varying based on the lifestyle, customs, installations and the various use of chemicals and proportions of the same, thus varying from place to place and time to time (Eriksson et al., 2002; Edwin et al., 2014). One of the most important characteristic of grey water is that it has infection causing properties due to the presence of fecal coliforms, which is more prevalent in houses having toddlers and infants (Surendran and Wheatley 1998). The water characteristics are considered to be varied as per the distribution networks of both grey water and that of potable