Waste or Wastewater Stabilization Ponds (WSPs) are artificial man-made lagoons used to treat grey- or blackwater by natural occurring processes such as solar light, wind, microbial competition and predation and algae. Typical WSP systems consist of series of an anaerobic, facultative and aerobic (maturation) pond, which can however also be used individually. WSPs are low-cost for operation and maintenance, but require the availability of large surfaces and expert design. The effluent is of good quality regarding the BOD and pathogen removal, but still contains relatively high amounts of nutrients (e.g. N and P) and is therefore appropriate for the reuse in agriculture (fertigation) or aquaculture (e.g. fish- or macrophyte ponds). Synonyms: Wastewater Stabilization Ponds, WSP
Wastewater can mean different things to different people with a large number of definitions in use. It generally described water which has been used and can not be used anymore at one place and is therefore rejected to another. In a broader perspective wastewater can be defined as a combination of one or more of the following: domestic effluent consisting of blackwater, brownwater and greywater; water from commercial establishments and institutions, including hospitals; industrial effluent; stormwater and other urban run-off; and agricultural, horticultural and aquacultureeffluent. Terms such as blackwater, greywater and yellow water have been adopted both as a way to describe the composition more accurately, and to emphasize the fact that used waters depending on their composition can be reused for other porposes (e.g. reuse of nutrients contained in the wastewater in agriculture).
In order to facilitate treatment and reuse of wastewater, it has to be collected. Wastewater can either be collected in a centralised sewer system, or, in the absence of this, with a system of human-powered or mechanised vehicles (cartage).
Wastewater Reuse at Home
This is the title of the factsheet that describes the various ways that wastewater reuse can be practiced at the household level. Water use optimisation means resistance to chronic and short-term water scarcity and cost and energy savings for water supply and wastewater treatment as less water is required and less polluted water produced. Besides installing water saving appliances, source separation and reuse of different types of wastewater is a way to optimise water use at home. Depending on the type, quality and quantity of water, wastewater can either be reused directly, or treated and reused (recycled). Synonyms: Reuse at home
Water allocation makes trade-offs between the priorities of stakeholders, profitability and economic returns, reliability of water supply, equity, and sustenance of ecosystems to ensure that good quality water is allocated in a manner that achieves economic efficiency, social equity and environmental sustainability.
Water charges are a widely used economic instrument to better control water use and water pollution by imposing a price on the use of the environment. The goal of such measures is to internalise negative externalities related to water use. Charges can be placed on emissions, users, the product, or on administrative services. Apart from influencing the amount of consumption, water charges can also activate innovation processes. Synonyms: Water Pollution Charge
To manage water resources sustainably, various approaches have been developed. These approaches include guidelines on how to conceptualise, plan and carry out project that aim at a improved management of water resources.
Water holding capacity
The ability of the soil to bind water due to its structure and amount of organic matter. Synonyms: Field capacity
A Water Pasteurisation Indicator (WAPI) is a simple thermometer that indicates when water has reached pasteurisationtemperature and is safe to drink. It consists of a small polycarbonate tube that contains a soybean wax that melts when water or milk is heated enough to be pasteurised (65˚C/149˚F). Since water pasteurises at temperatures well below its boiling point, WAPIs save time and fuel. Synonyms: WAPI, Water Pasteurization Indicator
Productivity is the ratio of a unit of output to a unit of input.The term water productivity is used exclusively to denote the amount or value of product over volume or value of water depleted or diverted.
In many parts of the world, water is not safe enough to drink. There are basic qualitative observations that quickly determine if water is not safe. However,there are many “invisible” substances that must be tested for professionally to identify the contaminants and to figure out how the specific polluted water can be purified. Testingcan be done in the fieldwith portable test kits or mobile laboratories. Water samples can also be collected and sent to a professional laboratory.
Because of its shape, the trap retains a small amount of water after the fixture's use. This water in the trap creates a seal that prevents sewer gas from passing from the drain pipes back into the occupied space of the building. Essentially all plumbing fixtures including sinks, bathtubs, and toilets must be equipped with either an internal or external trap. Synonyms: Liquid Trap Seal, Plumbing Trap
Trucks equipped with a tank to deliver big amounts of fresh and/or drinking water. Synonyms: Cistern Truck, Tank Truck
This term denominates the consumption of water for different purposes, without which no life would be possible on earth. Water use is generally divided into household use, industrial and commercial use, and agricultural use.
Water Use Efficiency
Water use efficiency includes any measure that reduces the amount of water used per unit of any given activity, consistent with the maintenance or enhancement of water quality. Generally, efficient water use is defined as the ratio between the actual volume of water used for a specific purpose and the volume extracted or derived from a supply source for that same purpose.
Water vending refers to the formal or informal reselling or onward distribution of utility water, or water from other sources by small-scale vendors for domestic use. E.g. water kiosks, water carriers, tanker trucks, households reselling water from their utility water connections, etc. Synonyms: independent water provider, small-scale providers, small-scale water provider, small-scale water supply, vended water, vendor-provided water, water entrepreneurs, water vending
Water, Sanitation and Hygiene
Global access to safe water, adequate sanitation, and proper hygiene education can reduce illness and death from disease, leading to improved health, poverty reduction, and socio-economic development. WASH stands for water, sanitation and hygiene and has become a popular notion. It is used worldwide to show that all three are interrelated and therefore have to be tackled together to reach the millennium development goals.
Casing used in boreholes is tubular material that provides support to the walls of the borehole and may be either temporary (used by the driller during drilling of the borehole and subsequently withdrawn) or permanent (forming part of the final construction of the completed borehole). Selection of casing material should be based upon water quality, borehole depth and diameter, drilling methods, local regulations and cost. Synonyms: Casing
All drilling methods alter the hydraulic characteristics of formation materials in the vicinity of the borehole. Development of a borehole after completion of drilling forms part of the normal drilling procedure. Development procedures are designed to restore or improve these characteristics to maximise the performance of the borehole by improving specific capacity and hydraulic efficiency. Well development methods include: overpumping, surging, jetting, hydro-fracturing, and other supplementary development methods.
Well rehabilitation of dug or drilled wells becomes necessary if operating wells lack in providing adequate water quality or quantity as the well becomes contaminated or clogged through natural processes or in consequence of emergencies (e.g. floods, seawater intrusion, etc.). It involves the cleaning and disinfection of the well and sometimes the application of well development procedures. Synonyms: Well Cleaning, Borehole Rehabilitation, Borehole Cleaning
The term well remediation is used in the oil industry. It refers to the cleaning of oil wells to improve performance and requires utterly different methods than the rehabilitation of water wells.
A well screen is a filtering device that allows groundwater to enter the well. It provides structural support but prevents sediment from entering, especially in unconsolidated strata. Proper screen design and selection is important for the hydraulic efficiency of the well, as well as for the longevity and long-term cost of the structure. Screens should have maximum open area to create minimum resistance to flow into the hole, but at the same time must minimise sediment ingress and provide adequate structural strength. Optimising each of these criteria for a particular well is the essence of screen design. Synonyms: Screen
Sewage is fed into and stored in an underground pit, commonly known as a wet well. The well is equipped with electrical instrumentation to detect the level of sewage present. When the sewage level rises to a predetermined point, a pump will be started to lift the sewage upwards.
Windrow composting is a simple, but slow composting process. The material is piled up in heaps or elongated heaps (called windrows). The size of the heaps ensures sufficient heat generation and addition of bulky materials, passive or active ventilation or regular turning ensures aeration. Systems with active aeration by blowers are usually referred to as forced aeration systems and when heaps are seldom turned, they are referred to as static piles. Leachate control is provided by a sloped and sealed or impervious composting pad (the surface where the heaps are located) with a surrounding drainage system. Synonyms: Open Composting