Appropriate Technology Glossary
Biofilter The use of living material such as bacteria or plants to process pollutants in water. Common uses include processing sewage through a microbial filter, capturing harmful chemicals or silt from surface runoff, and using plant roots to clean water.
Blackwater the used water from your kitchen sink (containing bits of decomposing food) and toilet (containing urine and feces). Handling blackwater is different than greywater because of increased concerns about ensuring that pathogens from these areas do not create illness if allowed into waterways or onto food growing in the garden.
Constructed Wetlands Natural wetlands act as a biofilter, removing sediments and pollutants such as heavy metals, feces, greywater, etc. from the water. They are also a habitat for native and migratory wildlife, they can absorb stormwater, and can reclaim (clean) land after mining, refineries or replace areas lost to human development or other disturbances. Constructed wetlands can be designed to emulate these features.
Drip Irrigation applies water slowly at the plant root zone where it is needed, reducing runoff and evaporation. Typically more than 90% efficient at allowing plants to use the water applied (unlike other forms of irrigation, such as sprinklers that are only 65-75% efficient). There are many places on line that show you how to convert a sprinkler system to drip irrigation. Benefits include:
Ferrocement Tank thin concrete panels using chicken wire as reinforcement, used in many applications such as roofs, walls, water, tanks or even ship hulls.
Filtration the process of separating suspended solid matter from a liquid, by causing the latter to pass through the pores of some substance, called a filter. The filter may be paper, cloth, cotton-wool, asbestos, slag- or glass-wool, unglazed earthenware, sand, or other porous material.
First flush diverter the device on a rain catchment system designed to divert debris, leaves, animal dung, and any toxins from your roof so they wash away, keeping your tank rain water cleaner. Typically requiring no power, they are a low-cost, low-tech way to improve water quality significantly.
Rain water is used for drinking, cooking, bathing and watering edible plants.
Flood irrigation Flood irrigation is an irrigation technique in which a field is essentially flooded with water which is allowed to soak into the soil to irrigate the plants. One form of flood irrigation is basin irrigation, in which water floods a basin surrounded by berms, usually made from earth. This technique can be useful for crops which need to remain submerged, like rice, and for soil which absorbs slowly. In furrow irrigation, the water runs down furrows between rows of crops, reaching the roots as it is absorbed. Surge irrigation involves the use of pulses of water which spurt, soak in, and spurt again. (Wikipedia) Flood irrigation and furrow irrigation do not work well in sand unless the areas being flooded are lined with impermeable materials such as plastic or gley or permeable materials such as organic matter (e.g., palm leaves). The type of lining used will depend on whether you are trying to just slow the water or trying to hold it and carry it somewhere.
Greywater the used water from your shower, washing machine and bathroom sink. This water can be filtered through rocks and sand to remove impurities and diverted into food growing systems such as food forests.
Hydraulic ram / hydram / Ram pump a water pump that uses the energy of flowing water to force a small fraction of that water to a reservoir at a higher level. The hydraulic ram is sometimes used in remote areas, where there is both a source of water and a need for pumping water to a destination higher in elevation than the source. In this situation, the ram is often useful, since it requires no outside source of power other than the energy of flowing water.
Hydropower harnesses the energy of moving or falling water. The term refers to a number of systems in which the water drives a turbine or waterwheel placed in streams or waterfalls.
Rainwater catchment a system designed to capture rain water and keep it on the property where it falls so it can be used there.
Separation toilet a toilet which separates urine from feces, and sends them to different places. These are not recommended because urine tends to collect around the separater element which then starts to smell like ammonia.
Soaker hose delivers water right to your plants' roots while keeping the leaves dry. Sprinklers can waste water due to evaporation and runoff, hand watering is time consuming and drip irrigation systems are often expensive. Switching to soaker hoses means you'll waste less water, lower your water bill and won't have to haul your hose around the garden.
Read more: http://www.ehow.com/how_2204109_use-soaker-hose.html#ixzz2hMtIyLJv
Solar still a simple way of distilling water using the heat of the sun to drive evaporation from humid soil, and ambient air. Distillation replicates the way nature makes rain. The sun's energy heats water to the point of evaporation. As the water evaporates, water vapor rises, condensing on the glass surface for collection. This process removes impurities, such as salts and heavy metals, and eliminates microbiological organisms. The end result is water cleaner than the purest rainwater. Wikipedia
Sprinklers a mechanism which distributes water through the air, onto plants and soil. If used in the sun, they are destructive as they can salinate the soil, or cause plants to burn.
SubirrigationIn agriculture, subirrigation, also known as seepage irrigation, is a method of irrigation where water is delivered to the plant root zone from below the soil surface and absorbed upwards. The excess may be collected for reuse. Subirrigation is used in growing field crops such as tomatoes, peppers, and sugar cane in areas with high water tables such as Florida and in commercial greenhouse operations. Advantages are water and nutrient conservation, and labor-saving. The outfitting cost is relatively high. Three basic types of subirrigation system are in general use for potted plants in greenhouses: ebb-and-flow (bench-mounted enclosures holding pots are filled and then drained); trough (water is flowed through bench-mounted, slightly sloping enclosures containing pots); and flooded floor (special sloped concrete flooring is flooded and drained). In Capillary-mat, the simplest form of sub-irrigation, a porous mat is in contact with the bottom of the container allowing water to move from the mat to the growing medium. The mat is placed on a plastic sheet to retain water and is usually covered with a perforated plastic sheet to slow the growth of algae. Water is usually delivered to the mat by a drip tube, but sprinklers or even hand watering can be used. Because a mat can be difficult to rewet when dry, it is kept partially moist all the time. Capillary mat systems are most often used for small containers and crops that need to be kept uniformly moist. (Wikipedia)
Biodigester (methane) (aka anaerobic digester) Anaerobic digestion is a collection of processes by which microorganisms break down biodegradable material in the absence of oxygen. The process is used for industrial or domestic purposes to manage waste and/or to produce fuels. As part of an integrated waste management system, anaerobic digestion reduces the emission of landfill gas into the atmosphere. Widely used as a source of renewable energy, the process produces a biogas, consisting of methane, carbon dioxide and traces of other ‘contaminant’ gases. This biogas can be used directly as fuel, in combined heat and power gas engines or upgraded to natural gas-quality biomethane. The nutrient-rich digestate also produced can be used as fertilizer. This system is used in the United Kingdom (2011), Germany and Denmark. (Wikipedia)
Cob oven and Cob building Cob or cobb is a building material consisting of clay, sand, straw, water and earth. Cob is fireproof, resistant to seismic activity, and inexpensive. (Wikipedia) Go to this link to see examples of cob houses: http://www.youtube.com/watch?v=j-i5pA-ocmY
Building With Cob: A Step-by-step Guide
The Hand-Sculpted House: A Practical and Philosophical Guide to Building a Cob Cottage: The Real Goods Solar Living Book
The Cob Builders Handbook: You Can Hand-Sculpt Your Own Home
Cogeneration the generation of electricity and other energy jointly, especially the utilization of the steam left over from heat generation to produce electricity. For instance, some solar heaters get hot enough to produce steam, which can be used to drive a turbine that produces electricity.
Electricity-free refrigeration This is done with a zeer pot which works because of evaporative cooling
(reduction in temperature resulting from the evaporation of a liquid, which removes heat from the surface where evaporation takes place. This process is employed in industrial and domestic cooling systems, and is also the physical basis of sweating).
Embodied energy http://oikos.com/library/green_building_glossary.html
Human powered system (bike powered electric, walking powered electric, etc) Kinetic and heat based electricity production is becoming more common. Devices producing electricity generated from car movement, walking areas in airports, body heat (flashlights), and even your coffee cup now exist. The low tech version would be well pumps run by see saws or a blender run with a bicycle.
Fuel cells create energy by creating a chemical reaction between a fuel (usually hydrogen) with oxygen. The output is water, and a small amount of other chemicals. It is a “clean” fuel.
Geothermal - means heat from the earth. Some places in the earth (where there is volcanic activity, hot springs, etc) produce heat that can be used to generate electricity. Hot springs have been used for bathing and heating for millenia in China, Egypt, Rome and elsewhere. A low tech passive use of the earth to regulate temperature is also called geothermal heating/cooling. At six feet below and lower, the earth tends to stay at a constant temperature of around 68 degrees F. A building can be maintained at a constant temperature through the use of pipes that pull 68 degree air into the home from the earth.
Jean Pain style compost electricity - Jean Pain developed a system of capturing heat and methane gas from his large compost piles to heat water and produce electricity for his home. He has made this system publicly available.
Masonry heater or stove (aka ceramic stove or tile stove) device for warming an interior space through radiant heating, by capturing the heat from periodic burning of fuel (usually wood), and then radiating the heat at a fairly constant temperature for a long period. This technology has been used in cold climates for centuries for heating. The kang bed-stove is used in China for cooking during the day and then residual heat is directed to heat bed platforms. In Germany and other parts of Europe they have the Kachel oven. Russia, Finland, Sweden - there is even evidence that cave-dwellers from the Neolithic period - have used such systems to keep themselves warm. (Wikipedia)
Minihydropower (aka small hydropower) energy from water sources such as the ocean, rivers and waterfalls which ranges in size from a small system to electrify a single home to a few hundred kilowatts for selling into the National Grid. See: http://w3.tm.tue.nl/fileadmin/tm/TDO/Indonesie/Hydro_Power.pdf
Net-zero-energy home http://oikos.com/library/green_building_glossary.html
Photovoltaic an arrangement of components designed to supply usable electric power for a variety of purposes, using the Sun (or, less commonly, other light sources) as the power source. (Wikipedia)
Rocket stove an extremely efficient stove using small diameter wood sticks called which has a short burn time but is very intense and reaches high temperatures without a lot of smoke. If one coppices new growth trees the use of wood is renewable.
Rocket mass heater a space heating system developed from the rocket stove and the masonry heater.
Solar oven (aka solar cooker) uses the energy of direct sun rays (which is the heat from the sun) to heat, cook or pasteurize food or drink. Because they use no fuel and cost nothing to operate, many nonprofit organizations are promoting their use worldwide in order to help reduce fuel costs (for low-income people) and air pollution, and to slow down the deforesation and desertification caused by gathering firewood for cooking. (Wikipedia)
Straw box oven (aka hay box or fireless cooker) the forerunner of the crockpot, and a very old fuel saving technology, which consists of an insulated box that you put a hot pot of food into, and leave it all day (or all night) to finish cooking.
Turbine a shaft with a fan of blades mounted on it, called the “rotor” because it rotates. The rotor is mounted inside a sealed casing that has a ring of nozzles mounted on it. The activating fluid is blown through these nozzles under high pressure causing the rotor to spin very, very rapidly. This is measured in “rpm” which denotes the number of turns completed in one minute around a fixed axis, and is named “revolutions per minute”.