A review of the most popular systems for greywater treatment

Abstract

With the scientific evidence of climate change is occurring, water conservation has now become extremely important and every drop of water counts. More than 60% of the domestic wastewater is a by-product of households, municipal wastewater. Known as greywater, it can be easily recycled but has historically been discarded instead. However, countries, municipalities, and communities have now realized the importance of graywater recycling and reuse. Studies and practices have been started to remove and or eliminate major pollutants so that the recycled water can be used for irrigation, toilet flushing, and many other uses. Different types of filtration systems can be used, such as slow sand filtration, rapid sand filtration, slanted soil, and others common systems techniques like sequencing batch reactor, upflow anaerobic sludge blanket reactor used in wetlands. This review aims to discuss the most efficient systems for greywater treatment, by comparing more than 20 systems for their biological, chemical and physical removal of pollutants.