Glossary
At the end of each definition in this Glossary there is a number in brackets. This indicates the number of the Study Session where the term is first used in this OpenWASH module.
Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL
3 |
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3Rs
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4 |
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4 Psfactors that a marketing strategy is based on: product, place, promotion and price (13) | |
A |
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aerobicwith oxygen; the term usually applies to microbial decomposition processes that take place where air is present (5) | |
affordabilityability to pay for a product or service (13) | |
agricultural waste
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anaerobicwithout oxygen; the term usually applies to microbial decomposition that takes place in the absence of air (5) | |
anaerobic digestiondecomposition of organic material by micro-organisms in the absence of oxygen to produce biogas (5) | |
anaerobic pondfirst stage in a waste stabilisation pond system that consists of a deep pond where anaerobic decomposition takes place (6) | |
Arborlooa type of composting latrine that does not require emptying. When the pit is full, a tree is planted in it and a new pit is dug (5) | |
ash contentpercentage of solid material remaining when all the combustible material in a waste has been burned (7) | |
B |
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bacteriasimple, single-celled microscopic organisms (2) | |
baseline datadata collected at the start of an intervention to provide comparison for the data collected later (15) | |
baseline positionthe situation in an area before the start of an intervention (such as the launch of a WASH programme) (3) | |
biochemical oxygen demand (BOD)amount of oxygen required by micro-organisms to break down the organic material in an effluent (4) | |
biodegradablecapable of being broken down by biological processes (7) | |
biodegradationbreaking down (decomposition) of organic substances by bacteria and other micro-organisms (4) | |
biogasmixture of methane (about 60%) and carbon dioxide produced by decomposition of organic material by micro-organisms (5) | |
biogas latrinetype of latrine where the excreta undergoes anaerobic digestion to produce biogas (5) | |
blackwaterwastewater that contains urine and faeces (1) | |
C |
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calorific valueamount of heat released when something is burned (7) | |
chemical oxygen demand (COD)amount of oxygen required to chemically oxidise the organic material in an effluent (4) | |
cistern-flush toilettoilet with a cistern (tank) containing water used to flush wastes away; requires connection to a piped water supply (5) | |
closed questionsquestions with a limited number of possible answers (3) | |
combustiblematerials that can be burned (7) | |
commercial opportunitiesways in which private sector organisations could provide products or services on a commercial basis for profit (13) | |
commercial wastesolid waste produced by the commercial sector (retail, education, banking, government, etc.) (1) | |
comminutorsdevices that use blades to shred rags, paper, etc. in wastewater at a treatment works (6) | |
compact (solid waste)to reduce the volume occupied by landfilled waste by drivng a tractor or other heavy vehicle over the waste (10) | |
compostsoil-like substance made from decayed organic matter that is used to improve soil (5) | |
compostingaerobic treatment of organic waste to produce a useful soil conditioner (8) | |
construction and demolition wastesolid waste from the demolition of old buildings, roads, etc., and from the construction of new ones (1) | |
controlled landfilllandfill site where measures are taken to reduce environmental pollution (10) | |
corrosivestrongly acidic or alkaline substances that can dissolve many materials and destroy living tissue (10) | |
D |
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desludgingremoval of sludge from pit latrines and septic tanks (6) | |
disasterserious disruption of the functioning of society, causing widespread human, material or environmental losses (14) | |
disposal (of waste)getting rid of waste that cannot be treated in any other way, usually by landfill (8) | |
drainfieldsystem of perforated pipes in trenches to allow the liquid effluent from a septic tank to soak into the ground (6) | |
E |
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ecological sanitation (ecosan)sanitation systems that allow the recovery of resources from the urine and faeces for use as a soil conditioner, liquid fertiliser or biogas (5) | |
effectivenessextent to which the purpose of a programme or project has been achieved. In ISWM, it is a principle stating that a waste management system must meet the needs of the waste plan and of the local people (11) | |
efficiencyincreasing the output for a given input of resources, or minimising the input for a given output. In ISWM, it is a principle stating that the waste management system should make the best use of money, people and other resources (11) | |
effluentanother term for wastewater that flows out from a source (4) | |
electronic and electrical waste (e-waste)waste electrical and electronic equipment and goods (1) | |
emergencysudden and unforeseen event that calls for immediate action to minimise its adverse consequences (14) | |
equityallocation of resources, services and opportunity to all segments of the population according to their needs. In ISWM, it is a principle stating that everyone has a right to an effective and safe waste management service (11) | |
evaluationobjective assessment part way through or at the end of a project to assess its design, implementation and results, and the extent to which the stated objectives have been achieved (15) | |
excretaa combination of urine and faeces (1) | |
F |
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facilities (sanitation)structures that are used to provide sanitation (1) | |
facultative pondswaste stabilisation ponds that are aerobic at the top and anaerobic at the bottom (6) | |
faecal-oral routetransmission of pathogens from human faeces to a person via the mouth (2) | |
faecal sludge managementset of processes including storage, collection, transport, treatment and safe end-use or disposal of faecal sludge (6) | |
F diagramdiagram that shows the pathways for human exposure to pathogens through the faecal-oral route (2) | |
focus groupsmall group of people who discuss an issue relating to them in an organised session with a facilitator/moderator (3) | |
G |
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grease trapa small tank within an outlet pipe that slows the flow of effluent so that oils and fat float to the surface and can be removed (4) | |
greenhouse gasesgases such as carbon dioxide and methane that contribute to human-induced climate change (2) | |
greywaterwastewater from washing, cooking and clothes washing (1) | |
gritvery small pieces of sand, stone and possibly glass and metal found in wastewater (6) | |
H |
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hazardoussomething with the potential to cause harm, such as toxic chemicals or infectious material (1) | |
hazardous wasteswastes that have the potential to cause substantial harm to public health and/or the environment (7) | |
healthcare wastesolid waste produced in health facilities (1) | |
heavy metalsgroup of toxic chemical pollutants that persist in the environment i.e. they do not break down by natural processes e.g. mercury, lead, cadmium, nickel, chromium and others (4) | |
helminthsworms that live as parasites in humans and other animals (2) | |
household hazardous wastehazardous materials such as cleaning products, batteries and paint found in household waste (10) | |
household wastesolid waste produced by people in their homes; also known as ‘residential waste’ (1) | |
hygieneset of practices that help to keep people healthy and prevent the spread of disease (2) | |
I |
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ignitable (waste)solid and liquid wastes that start to burn easily when exposed to a flame or any other source of ignition (10) | |
impact evaluationidentifying the effects on individuals, households or communities caused by implementing a project or programme (15) | |
impactslong-term effects and consequences of project or programme outcomes (15) | |
impermeabledoes not allow fluid to pass through (6) | |
improved facilities (sanitation)sanitation facilities that ensure the separation of faeces from people (1) | |
incinerationtreatment of waste by burning under controlled conditions (10) | |
in-depth interviewdetailed interview on a particular subject (3) | |
indicatorsomething that can be seen, measured or counted and provides evidence of progress towards a target (15) | |
industrial wastesolid waste produced by industrial organisations (1) | |
inorganicnot derived from living organisms (4) | |
Integrated Solid Waste Management (ISWM)using a combination of techniques and technologies to treat waste in the way that is best for people's health and the environment (11) | |
internally displaced people (IDP)people who are forced to leave their homes in the event of an emergency and move to another location within their own country (14) | |
K |
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key performance indicators (KPIs)measures of inputs, processes, outputs, outcomes and impacts for programmes or strategies that have been identified as the most significant (15) | |
koralespeople who collect recyclable wastes from individual households as part of the informal waste management sector (8) | |
L |
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landfillarea of land set aside for the final disposal of solid waste (1) | |
landfill gasgas that forms in landfills as the waste decomposes – mainly a mixture of carbon dioxide and methane (10) | |
leachatepolluted water that emerges at the base of landfilled waste (10) | |
liquid wasteany waste in a liquid or semi-solid form, including human waste and all types of wastewater (1) | |
M |
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management information system (MIS)computer-based data collection and analysis system (15) | |
maturation pondthe 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) | |
mechanical biological systemsystem for treating sewage using a sequence of mechanical (such as aeration) and biological processes (6) | |
menstrual hygiene management (MHM)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) | |
methanea flammable gas produced during anaerobic decomposition processes; a powerful greenhouse gas (7) | |
moisture contentpercentage of water in a solid substance (7) | |
monitoringsystematic and continuous assessment of the progress of a project or programme over time, in order to check that activities are going to plan (15) | |
morbidityillness (2) | |
mortalitydeath (2) | |
MSEs (micro and small enterprises)small businesses with fewer than 50 employees (9) | |
municipal waste (municipal solid waste)combination of all the solid wastes produced in urban areas; similar in composition to residential waste (1) | |
N |
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non-biodegradablenot capable of undergoing biological decomposition (7) | |
non-combustiblematerials that do not burn (7) | |
non-hazardous wasteswaste that is not classed as hazardous (although note that these wastes can still be harmful) (7) | |
O |
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objective (assessment)assessment based solely on observations, measurements, etc. and not influenced by the personal feelings and opinions of the assessor (3) | |
observationassessment based on what the investigator sees and experiences when visiting the area (3) | |
open burningburning waste in a uncontrolled way in the open air (10) | |
open defecationthe practice of defecating (excreting faeces) in the open and not in a latrine (1) | |
open dumpinguncontrolled disposal of solid waste in open spaces such as waste ground, roadsides and riverbanks (10) | |
open questionsquestions that allow the respondent to say whatever they wish (3) | |
organicderived from living organisms (4) | |
outcome evaluationassessment of what a project or programme has achieved in the short to medium term (15) | |
outcomeseffects of a project or programme, usually in the short to medium term (15) | |
outputsthings produced or objectives achieved by a project or programme (15) | |
P |
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parasitic wormsgroup of parasites such as tapeworms or nematodes (also known as roundworms); helminthes (2) | |
pathogendisease-causing agent (1) | |
peri-urban areasareas around a town or city between the urban and rural areas and having some characteristics of both (2) | |
pHmeasure of acidity and alkalinity. It has a scale from 0 to 14: pH 7 is neutral, less than 7 is acid and more than 7 is alkaline (6) | |
placenta pitpit in a hospital or healthcare centre grounds for disposal of anatomical and pathological waste (placentas, body parts, blood, body fluids) (12) | |
polluting potentialpotential of wastewaters to cause pollution, i.e. to cause damage to the condition, health, safety or welfare of animals, humans, plants or property (4) | |
pollutionintroduction into the environment of substances liable to cause harm (1) | |
pour-flush toilettoilet where the urine and faeces are flushed away by pouring water from a jug down the toilet after use (5) | |
primary collectioncollection of waste from individual households and businesses or from communal bins serving a number of households (9) | |
primary treatmentfirst stage of the sewage treatment process where most solids are removed by sedimentation (6) | |
private sector participationinvolving the private sector (in waste management) (9) | |
process evaluationassessment of the ways a project or programme has been undertaken to determine whether it is on track to meet its aims (15) | |
protozoasingle-celled microscopic organisms, larger than bacteria (2) | |
public-private partnershipcollaboration between a public sector body or organisation and a private sector company (9) | |
Q |
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qualitative datainformation collected about views and opinions (15) | |
quantitative datameasurable, factual data (15) | |
questionnairea set of questions that people are asked to answer as part of an assessment (3) | |
R |
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rapid-onset disasterdisaster resulting from a unique, distinct and unforeseeable event, such as a flood (14) | |
reactive (waste)wastes that react rapidly with air or water, or are explosive (10) | |
recovery (of waste)finding other uses for wastes that enable some value to be extracted or recovered from them (8) | |
recycleprocessing wastes to allow them to be manufactured into new materials and goods (1) | |
reduction (of waste)avoiding the production of solid waste (1) | |
reed bedartifically constructed wetland with reeds planted in it for wastewater treatment (6) | |
replacement (of hazardous waste)replacing a hazardous material with a non-hazardous one during manufacturing, or changing a process so that it does not produce waste products that are hazardous (10) | |
residential wastesolid waste from households and other residential areas (1) | |
retention timelength of time that wastewater spends (is retained) in a septic tank, pond, etc. (6) | |
reuseusing a waste item for its original purpose more than once (1) | |
S |
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sanitary landfillan advanced landfill with engineering measures to prevent the escape of leachate and collect the landfill gas (10) | |
sanitationprevention of human contact with wastes; the provision of facilities and services for the safe disposal of human excreta (1) | |
sanitation laddermeasure of progress towards the provision of adequate sanitation facilities for every household (1) | |
sanitation marketingan approach to household sanitation promotion that aims to improve sanitation standards by encouraging people’s demand for sanitation products and services (13) | |
sanitation platformcast concrete or plastic latrine slab that is safe for children and convenient for adults, and has footrests (5) | |
secondary collectioncollection of solid waste from transfer stations for transport to the final disposal site (9) | |
secondary treatmentstage in sewage treatment where aerobic micro-organisms break down organic material (6) | |
semi-structured interviewan interview with a set of topics and questions for discussion that develops according to responses given (3) | |
septic tankunderground, watertight tank in which sewage is collected and partially treated before discharge (5) | |
services (sanitation)the entire scheme for providing sanitation (facilities, maintenance, waste treatment, finance) (1) | |
settleable solidssolid particles in wastewaters that settle out when the flow rate is reduced (4) | |
sewagecombined wastewater from all sources; includes blackwater, greywater and stormwater (1) | |
sewerunderground pipes that carry sewage; ditches containing sewage may be described as open sewers (4) | |
seweragenetwork or system of sewers (4) | |
shared sanitation facilitieslatrine used by more than one family/household (1) | |
slow-onset disasterdisaster that unfolds over time as a result of events, such as drought and famine (14) | |
Sludge Gulpertype of hand-operated pump for desludging pit latrines (6) | |
soakawaypit where liquid effluent, typically from a septic tank, is allowed to soak into the ground | |
soil improverproduct such as compost that makes soil more productive and resistant to drought (8) | |
solid wasteall the discarded solid wastes arising from human activities (1) | |
stakeholderan individual, organisation or group that has an interest in something, e.g. a situation, project, process or activity (11) | |
stormwaterrainwater that collects on the ground and runs off into channels, ditches and rivers and may carry pollutants with it (1) | |
structured interviewinterview based only on a set of questions drawn up before the start (3) | |
subjective (assessment)assessment based on the investigator’s personal experience and views, which will vary between individuals (3) | |
sullageanother term for greywater (1) | |
suspended solidssolid particles in wastewaters that do not settle out when the liquid is left to stand; in flowing water, this includes solids that are carried in the flow (4) | |
sustainabilityconcept describing effective and long-lasting projects and other interventions that have given consideration to economic, social and environmental factors. In ISWM, it is a principle stating that the waste management system must be capable of operating in the long term, mimimising the use of non-renewable resources and not causing pollution problems that will need to be dealt with by future generations (11) | |
sustainable drainage systems (SuDS)range of techniques to reduce the speed of flow of surface run-off, encourage its infiltration into the ground, and reduce the risk of flooding (6) | |
T |
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transfer stationplace where waste from primary collections is combined and transferred to a vehicle for transport to the final disposal site (9) | |
U |
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unimproved facilities (sanitation)sanitation facilities that do not ensure the separation of faeces from people (1) | |
urbanisationincrease in the number of people living in towns and cities relative to rural areas (1) | |
urine diverting latrinetype of latrine that separates urine and faeces, allowing the recovery of two products (5) | |
V |
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Vacutugtype of small, mobile device for removing and transporting sludge from pit latrines (6) | |
vectorsanimals that can be responsible for spread of diseases e.g. mosquitoes, flies, rats(2) | |
ventilated improved pit (VIP) latrinetype of latrine fitted with a vent pipe to provide a natural ventilation system that reduces odours and fly nuisance (5) | |
virusesinfectious agents that are not living organisms but are able to invade cells and cause them to manufacture more virus material (2) | |
W |
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wastesubstances or objects that no longer have a use and are disposed of (1) | |
waste hierarchya guide to the best ways of treating solid waste that ranks them in order of preference (1) | |
waste managementcollection, treatment and disposal of solid waste (1) | |
waste stabilisation pondsseries of ponds where natural biological and physical processes remove pollutants from wastewater (6) | |
willingness to payextent to which people are motivated to pay for improved sanitation and waste management (13) | |
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