Abbreviation: LPG
Glossary
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- Lacto-fermentation
- The lacto-fermentation process (also lactic acid fermentation) is a biological anaerobic degradation process (similar to silage production process in agriculture), but without gas formation. During this process, sugars such as glucose, fructose, and sucrose, are converted into cellular energy and the metabolic by-product lactic acid. Lacto-fermentation is used throughout the world to preserve foods. When the acidity rises due to lactic acid fermenting organisms, many other pathogenic microorganisms are killed. Yogurt and sauerkraut are some of the most famous products produced by lacto-fermentation. Most lactic acid bacteria obtain energy only from the metabolism of sugars and hence are usually restricted to habitats in which sugars are present. The two most important subgroups of the lactic acid bacteria depend on the nature of the products formed from the fermentation of sugars: one group, called homofermentative, produces a single fermentation product, lactic acid, whereas the other group, called heterofermentative, produces other products, mainly ethanol and CO2 as well as lactate. Even though anaerobe, most lactic acid bacteria have the advantage not to be sensitive to O2, allowing them to grow in its presence as well as in its absence (they are aerotolerant anaerobes). Synonyms: Lactic Acid Fermentation, Lactofermentation
- Lake
- Lakes are discrete, largely isolated ecosystems in which the interplay between physical, biogeochemical and organismal processes can be studied, understood, and put to use in effective management.
- Landfill
- A landfill is a land disposal site for waste, which is designed to protect from environmental pollution and health risks. It is not the same as an open dump. Landfills are built to concentrate the waste in compacted layers to reduce the volume and monitored for the control of liquid and gaseous effluent in order to protect the environment and the human health. In reality, the term is often also used for unprotected waste dumping sites. Synonyms: Engineered Landfill, Landfilling, Sanitary Landfill
- Large-scale Hydro Power
- Hydropower uses the power of moving water (kinetic energy) to generate electricity, usually requiring the construction of dams to store large quantities of water. Generally, large-scale hydropower produces over 100 MW. Synonyms: Large Hydroelectric Power
- Leachate
- Leachate is the liquid fraction of a mixed waste that, through gravity or filtration, is separated from the solid component.
- Lead
- Lead, a heavy, bluish-gray, soft, ductile metal, the chemical element of atomic number 82. (Symbol: Pb)
- Learning Needs Analyses
- Learning needs analyses are undertaken to determine the gap between the existing skills, knowledge and abilities and those desired. Once this gap is determined, decisions can be taken as to the type of training required. The procedure for conducting such an analysis can be quite simple but usually requires quite a bit of time before a training.
- Life-Cycle Cost Approach
- The life-cycle cost approach is a methodology for monitoring and costing sustainable water, sanitation and hygiene (WASH) services by assessing costs and comparing them against levels of service provided.
- Lime
- Lime is a white caustic alkaline substance consisting of calcium hydroxide (Ca(OH)2) obtained by heating limestone (calcium carbonate, CaCO3). Because of its alkaline properties, calcium hydroxide has many and varied uses such as a flocculant in water and sewage treatment or improvement of acid soils. It can also be used as an additive to faeces in UDDTs in order to achieve alkaline treatment and enhanced pathogen die-off.
- Linear alkylbenzenesulfonate
- Linear alkylbenzenesulfonate (LAS) is the most widespread anionic surfactant used in domestic and commercial detergent formulations, primarily in laundry detergents and cleaning products. LAS, derived from petroleum bi-products, is quite rapidly degraded aerobically, but only very slowly or not at all under anaerobic conditions. Synonyms: LAS
- Lining
- Support of the sides of an excavation made out of concrete, bricks, stone or precast concrete rings. During construction, the lining provides protection against caving and collapse and prevents crumbling ground from filling up the dug hole. After completion of the well it retains the walls.
- Liquified Petroleum Gas
- A mixture of light gaseous hydrocarbons (ethane, propane, butane, etc.) made liquid by pressurisation and used as fuel. Synonyms: Autogas, GPL, LP Gas, LPG
- Logical Framework Approach
- A strategic planning and project management approach.
- Low-flush Toilet
- A low-flush or low flow toilet is a flush toilet that uses significantly less water than a full-flush toilet. That means, they use 4 to 6 litres instead of the 8 to 20 litres. Low-flush toilets use a special design of the cistern and the siphon in order to allow the removal of faeces and excreta with less water. Most often, they also include a-dual flush system, with one flush being designed for urine only using less than half a litre for flushing. Today, there are many suppliers of different models of low-flush toilets all over the world. Low-flush toilets reduce the water consumption, however, low-flush toilet still require large amounts of fresh water and with certain models, users have to flush even twice in order to achieve the complete removal of faeces from the bowl. Synonyms: Low Consumption Toilet, Low-flow Toilet
- Low-pressure membranes
- Low-pressure membranes are used for microfiltration and ultrafiltration.
- Low-rate Digestion
- Low-rate anaerobic digestion processes do not retain biomass and the relatively long HRT is equal to the SRT. These processes are adapted for the treatment of homogeneous high-strength wastes, such as agricultural slurries or municipal organic wastes. Synonyms: Low-rate Anaerobic Digestion
- Low-solids Digestion
- Low-rate anaerobic digestion systems are classified according to the percentage of total solids (TS) in the waste stream. Wet digestion means that the TS content is lower than 20 %. Synonyms: Wet Digestion
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