Wastewater can be classified into two categories: blackwater and greywater. Although they are both wastewaters, they have different levels of contamination, which is why they must be treated differently. Both varieties can be recycled through treatment systems and are often reused for irrigation and cleaning.
Blackwater: is the wastewater from bathrooms and toilets that contains faecal matter and urine. Water from kitchens and dishwashers are also considered blackwater due to the contamination by pathogens and grease (Department of Industry, Science, Energy and Resources 2013, Your Home, Australian Government, Canberra). It is also referred to as sewage or brown water and can carry disease and bacteria, both of which could be harmful.
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Abstract:This research describes the feasibility of applying a UASB reactor for the treatment of concentrated black (toilet) water at 25 C. On average 78% of the influent load of COD at an HRT of 8.7 days was removed. Produced methane can be converted to 56 MJ/p/y as electricity and 84 MJ/p/y as heat by combined heat and power (CHP). Minimum reactor volume at full scale was calculated to be 63L per person (for black water containing 16 gCOD/L produced at 5 L/p/d) and this is more than two times smaller than other type of reactors for anaerobic treatment of concentrated black water.Keywords: black water; anaerobic treatment; UASB reactor; sanitation; separation at source
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