Example: barber
Search results with tag "Operational and environmental issues"
SEWAGE SLUDGE: Operational and Environmental Issues …
www.fwr.orgSewage sludge is also a good base medium for digesting with other organic residuals [biowastes]. It was sewage collection and treatment (public health engineering) that cut waterborne disease and increased life expectancy in towns and cities in the mid-19th century, so it is no surprise that untreated sewage sludge contains pathogens