Dear researchers,
Treated greywater is a valuable resource for water efficiency and reuse, benefiting both water supply and wastewater systems. But it's quite tough to find a method that is both economical and convenient. According to your perspective, which is the best method?
Grey water is defined as used wastewater generated from sources such as the bathroom, kitchen, and laundry. The sewage is not mixed into it. Grey water recycling helps reduce household water usage by about 50%. The characteristics of the grey water may dictate the treatment required. The grey water generally contains much less concentrations of pathogens.
In normal circumstances the sedimentation process is enough. The sludge found at the bottom can be removed through sludge drying beds. However, depending upon the pollutants present, the treatment required for grey water may include Pre-filtration, Sedimentation, Post filtration or UV disinfection.
Simple sedimentation is quite economical and convenient.
The treatment would firstly depend on intended reuse of the greywater. In apartment buildings, institutions and sport facilities the reuse scheme could be toilet flushing. For this use biofiltration are appropriate to ensure biofouling doesn't clog the cistern for the toilet and to make the water be smell and color free. For use in institutions or multi-family dwellings Danish authorities require UV-disinfection is used.
Experience from Denmark is that system that omit laundry water from the reuse scheme are more stable as the washing water tend to inhibit biofiltration.
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