Heavy metals and other contaminants will be a particular challenge where biosolids (sludge) from wastewater treatment plants is used in farming as the sewer system might receive wastewater from domestic and industrial sections of the city. Faecal sludge collected by honey suckers from household based septic tanks should have a better reuse quality. Data are needed to confirm this, and how much of any contaminants eventually passes the soil and root barriers to enter the food chain.
Heavy metals and other contaminants will be a particular challenge where biosolids (sludge) from wastewater treatment plants is used in farming as the sewer system might receive wastewater from domestic and industrial sections of the city. Faecal sludge collected by honey suckers from household based septic tanks should have a better reuse quality. Data are needed to confirm this, and how much of any contaminants eventually passes the soil and root barriers to enter the food chain.