computer-based data collection and analysis system (15)

the final stage of a waste stabilisation pond system, where pathogenic viruses and bacteria are removed and eggs of parasitic worms settle out in the sludge (6)

system for treating sewage using a sequence of mechanical (such as aeration) and biological processes (6)

provision of facilities to allow girls and women to manage their monthly menstrual periods, including materials to absorb or collect menstrual blood, private places to change and clean/dispose of these materials, and handwashing facilities with soap (12)

a flammable gas produced during anaerobic decomposition processes; a powerful greenhouse gas (7)

percentage of water in a solid substance (7)

systematic and continuous assessment of the progress of a project or programme over time, in order to check that activities are going to plan (15)

illness (2)

death (2)

small businesses with fewer than 50 employees (9)

combination of all the solid wastes produced in urban areas; similar in composition to residential waste (1)