see also Water aerationAeration also called aerification is the Systems engineering process process by which air is circulated through, mixed with or solvation dissolved in a liquid or substance. Aeration of liquids File Fine Bubble Diffuser Tube .jpg thumb Aerating water by means of fine pore membrane diffuser Methods Aeration of liquids usually water is achieved by passing the liquid through air by means of fountain s, Waterfall cascades , paddle wheels or cones. passing air through the liquid by means of the Venturi tube , Aeration Turbine aeration turbines or compressed air which can be combined with diffuser s air stone s , as well as fine bubble diffusers , coarse bubble diffusers or linear aeration tubing. Ceramics are suitable for this purpose, often involving dispersion of fine air or gas bubbles through the porous ceramic into a liquid. The smaller the bubbles, the more gas is exposed ... increases the rate of gas transfer aeration due to the higher contact surface area. The pores which these bubbles pass through are generally micrometre size. Uses of aeration of liquids To smooth Laminar ... Water aeration Pond aerationAeration of soil File Plug Aerator.jpg thumb Lawn aerator Plug core lawn aerator Refers to the extent of Porosity Porosity of soil air gaps in soil . Aeration commonly refers to the process of using mechanized equipment to either puncture the soil with spikes spike aeration or remove approximately 1 X2 cores of soil from the ground core aeration . Aeration may be overlooked ... and reduces puddles formation. Spike aeration involves the use of an Lawn aerator aeration machine ... with turf. Core aeration is done on turf areas as a means of reducing turf compaction , reducing thatch ... models, ride on versions and tractor pulled versions. Aeration in food Refers to the process in which ... 1 metre el escanciado to increase aeration. See also Wiktionarypar aeration Winkler test for dissolved ... Chemical processes cs Aerace de Aeration et Aeratsioon es Aireaci n climatizaci n ko it Aerazione ... more details
Linear aeration is a relatively new aeration process it allows water to penetrate the soil and to be retained in the proper amounts. Linear aeration also adds organic material organic nutrition, soil softeners humus , topsoil , compost , sand , clay , etc. if necessary. Gardens In linear aeration, the necessary organic matter is added on top of the soil surface, between plantings. The grooves are then cut into the soil to let the amendments and additives enter the soil and recovered in the same passage. Lawns Linear aeration also alleviates excessive water in lawn areas. In linear aeration, the necessary organic matter is added on top of the turf. Next, grooves are cut into the turf to let the soil additives enter the soil the grooves are recovered in the same passage. Benefits of linear aeration Gardens irrigation water conservation . promotes stronger and deeper root development, for plant health and drought tolerance. permits proper distribution of soil amendment s and additives. allows organic nutrition absorption. Lawns alleviates soil compaction in heavily traveled areas provides smoother lawn surfaces drastically reduces disruption of actual turf surface compared to coring or plugs aeration causes minimal interruption of use of athletic fields See also Category Soil improvers Soil improvers index Portal Gardening References Unreferenced date November 2006 Category Soil Category Soil improvers Category Horticultural techniques Category Backyards Category Lawn care gardening stub ... more details
File Detail motoru turb ny poh n j c vzduch do potrub , V K ran .jpg thumb 250px Aeration turbine with pipeline Aeration Turbines are designed to aerate and mix fluids industrially. They are foremost used in brewing, pond aeration and sewage treatment plants. Aeration Turbines are designed for mixing gases, usually air, with a liquid, usually water. They can serve additional purposes like destratification , agitator device agitator or pump . There are numerous design variations in use or newly entering the market. Most are centrifugal, where fluid enters at the axis and exits around the perimeter of the rotor. Aeration Turbines can run open or in a housing. Some designs have bladed rotors which leads to more splashing and those need to run close to the surface, which is an obvious sign of lesser efficiency. Generally the performance efficiency of Aeration Turbines is very high, the space requirement is compact, both at high reliability and all those factors reduce operational cost. The use of Aeration Turbines in industry is still underdeveloped especially with waste water treatment . With raising population and the growing strain on clean water supplies such environmentally friendly solutions are becoming more important. The technology allows a more decentralized approach to waste water treatment as sewage can be oxigenised at pumping stations for bacteria to start breaking down the sewage before it even arrives at centralized processing plants. Aeration Turbines are more and more entering industry because of their significantly higher efficiency and reduced size of used gear compared to other methods of aeration. This means less investment into process infrastructure and substantial savings to both the overall cost but formemost running cost for electricity. External ... hefetechnik produkte sterilbeluefter.shtml Aeration Turbine made by Heinrich Frings GmbH & Co. KG http www.eurotech water.com english eolo2detail en.htm Aeration Turbine made by Euro Tech Water Ltd ... more details
thumb upright right Fountains aerate the lakes. Water aeration is the process of increasing the oxygen saturation of the water. Water quality Water aeration is often required in water bodies ..., agricultural run off, or over baiting a fishing lake. Aeration can be achieved through the infusion ... which can decrease the ability of the water body to support life. Aeration methods Any procedure by which oxygen is added to water can be considered a type of water aeration. This being the only criterion, there are a variety of ways to aerate a pond. There are two categories of pond aeration surface aeration and subsurface aeration . Natural aeration Natural aeration is a type of both sub surface and surface aeration. It can occur through sub surface aquatic plants. Through the natural process ... disturbs the surface of the pond and natural aeration can occur through a movement of water caused by an incoming stream , waterfall , or even a strong flood . Surface aeration Fountains Fountains ... Tucker Tucker, Craig. Pond Aeration. https srac.tamu.edu index.cfm event getFactSheet whichfactsheet 183 Pond Aeration SRAC Factsheet 3007 ref This process utilizes air water contact to transfer oxygen ... its return to the water, restores it to the pond. In this regard paddlewheel aeration works very similarly to floating surface aerators. cite . Subsurface aeration Subsurface aeration seeks to release bubbles at the bottom of the pond and allow them to rise by the force of gravity. Diffused aeration ... will result in an oxygen transfer. ref name Bolles Bolles, Steven A. Modeling Wastewater Aeration ... aeration Coarse bubble aeration is a type of subsurface aeration wherein air is pumped from an on shore ... aeration.pdf format PDF title Lake Aeration and Circulation publisher Illinois Environmental Protection ... Protection Agency. Wastewater Technology Fact Sheet Fine Bubble Aeration. Office of Water .... ref name Bolles In comparison to other aeration techniques, coarse bubble aeration is very inefficient ... more details
Extended aeration is a method of sewage treatment using modified activated sludge procedures. It is preferred for relatively small waste loads, where lower operating efficiency is offset by mechanical simplicity. Conventional sewage treatment Mechanized sewage treatment typically includes settling in a primary clarifier, followed by biological treatment and a secondary clarifier. Both clarifiers produce waste sludge requiring sewage sludge treatment and disposal. Activated sludge agitates a portion of the secondary clarifier sludge in the primary clarifier effluent. Remaining secondary sludge and all primary sludge typically require digestion prior to disposal. Process modification Extended aeration agitates all incoming waste in the sludge from a single clarifier. The combined sludge starts with a higher concentration of inert solids than typical secondary sludge and the longer mixing time required for digestion of primary solids in addition to dissolved organics produces aged sludge requiring greater mixing energy input per unit of waste oxidized. Applications Extended aeration is typically used in prefabricated package plants intended to minimize design costs for waste disposal from small communities, tourist facilities, or schools. In comparison to traditional activated sludge, longer mixing time with aged sludge offers a stable biological ecosystem better adapted for effectively treating waste load fluctuations from variable occupancy situations. Sludge may be periodically removed by septic tank pumping trucks when solids concentrations become high. Notes reflist References cite book author Hammer, Mark J. title Water and Waste Water Technology year 1975 publisher John Wiley & Sons isbn 0 471 34726 4 cite book author Metcalf & Eddy, Inc. title Wastewater Engineering year 1972 publisher McGraw Hill Book Company isbn 0 07 041675 3 cite book author Steel, E.W. and McGhee, Terrence J. title Water Supply and Sewerage, 5th Edition year 1979 publisher McGraw Hill Book ... more details
Wiktionarypar aerator Aerators are various devices used for aeration , or mixing air with another substance, such as soil or water. Aerator may also refer to Aerated lagoon Floating surface aerators Floating surface aerators , used in aerated lagoons Faucet aerator Lawn aerator Water aerationAeration methods Pond or lake aerator , used in water aeration Wine accessory Wine aerator Wine aerator disambig ... more details
Image AeratedWater.jpg thumb 210px Aerated water coming from a faucet Aerated water is, correctly speaking, distilled water to which wiktionary purification purified air is added to improve its flavor. The term is, however, frequently applied to carbonated water . Purpose of aeration Sulfur chemical compound compounds dissolved in water are not necessarily dangerous, but can give the water a bad taste or foul smell. These compounds can be removed in several ways, the most effective being by exposure to chlorine gas. However, aeration can also be effective if the amount of sulfur in the water is relatively low. During aeration, water is pumped into a non pressurized tank and agitated. This physically removes many of the sulfur compounds, which are then vented. Exposure to oxygen in the air also oxidizes some of the compounds, creating atomic sulfur which can be filtered from the water. Aeration is also an effective means of removing radon from water. Small tanks and Pond aeration ponds for keeping aquatic animals such as fish or lobsters often rely on aeration to maintain sufficient level of Oxygenation environmental oxygenation in the water. This can be achieved by pumping air into the water, allowing it to bubble to the surface or by a fountain jet agitating the water. Both these methods create an agitated, large amount of surface area between the water and the air, thus allowing transfer of gases. Wave action on the shores of large bodies of water can provide aeration of the water in the vicinity, thus providing enhanced oxygenation which can benefit various aquatic lifeforms. See also Drinking water Water purification Pond aeration References Grocers cite web title Hydrogen Sulfide Removal Methods publisher Excel Water Technologies Inc. url http www.excelwater.com eng b2c h2s.php accessdate 2007 03 09 archiveurl http web.archive.org web 20070306065622 http www.excelwater.com eng b2c h2s.php? archivedate 6 March 2007 DASHBot deadurl no Category Water lt Gazuotas v ... more details
An air diffuser or membrane diffuser is an aeration device typically in the shape of a disc, tube or plate, which is used to transfer air and with that oxygen into sewage or industrial wastewater. Oxygen is required by microorganisms bacteria residents in the water to break down the pollutants. Diffusers use either rubber membranes or ceramic elements typically and produce either fine or coarse bubbles. Types of Diffusers Diffusers are generally referred to as either fine bubble diffusers Fine Bubble Fine Pore coarse bubble diffusers Coarse Bubble Other diffused aeration devices include jet aerators , aspirator s, and U tubes. ref http www.epa.gov owm mtb fine.pdf ref Design Specifications Typical efficiency of a full floor coverage diffused aeration system in clean water is 2 ft submergence or 6.6 m submergence. When converted to mass transfer into process or dirty water, it is typically closer to about half of those figures. Manufacturers of fine bubble systems have supported claims that the type, number and size of pores have a great effect on efficiency of a diffused aeration system. ref http www.wastewater.com pdf 142.pdf ref Types of diffused aeration systems Diffusers are typically connected to a piping system which is supplied with pressurized air by a blower. This system is commonly referred to as a diffused aeration system or aeration grid There are two main types of diffused aeration systems, retrievable and fixed grid, that are designed to serve different purposes. In the case of a plant with a single tank, a retrievable system is desirable, in order to avoid stopping operation of the plant when maintenance is required on the aeration system. Fixed systems, on the other ... use of the floor. Automated software is available on the web to assist with drafting of aeration systems ... External links EDI Tech Bulletins http www.wastewater.com SSI Aeration http www.stamfordscientific.com Ecosafe diffused aeration http www.diffusedaeration.com Environmental technology DEFAULTSORT Diffuser ... more details
Floodability may refer to one of the following. Floodability ship , a characteristic of the construction of a ship to resist flooding. Floodability powder of Powder substance powderized materials, its tendency to liquid like flow due to natural fluidization of a mass of particles by air aeration . The risk of flooding of land areas or the degree of this risk. disambig ... more details
Multiple issues wikify March 2012 unreferenced December 2009 orphan December 2009 The Hydraulic retention time HRT also known as Hydraulic residence time or t tau , is a measure of the average length of time that a soluble compound remains in a constructed bioreactor. Hydraulic retention time is the volume of the aeration tank divided by the influent flowrate math HRT frac Volume of aeration tank influent flowrate math where using SI Unit s Volume is in m sup 3 sup and Influent flowrate is in m sup 3 sup h . HRT is usually expressed in hours or sometimes days . DEFAULTSORT Hydraulic Retention Time Category Hydrology Category Environmental engineering Category Hydraulic engineering Category Chemical engineering Category Waste treatment technology Chem stub Hydrology stub ... more details
Surplus Activated Sludge refers to the bacterial cell bodies produced in Sewage treatment works by the aeration of sewage effluent. It is settled in large tanks, dewatered and then treated in a variety of ways typically putting to land, or incineration. It is very hard to digest or dry properly due to the thick cell wall, which is of course intended to retain moisture. Enormous pressures of 10,000 bar are required to rupture the cell wall Category Sewerage ... more details
Image aeration floor.jpg frame right Channeled concrete floor of a composting pad for perforated piping that delivers oxygen to the composting mass Aerated Static Pile ASP composting , refers to any of a number of systems used to biodegrade organic material without physical manipulation during primary composting . The blended admixture is usually placed on perforated piping, providing air circulation for controlled aeration . It may be in windrow composting windrows , open or covered, or in In vessel composting closed containers . With regard to complexity and cost, aerated systems are most commonly used by larger, professionally managed composting facilities, although the technique may range from very small, simple systems to very large, capital intensive, industrial installations. ref http www.edmonton.ca for residents garbage recycling edmonton composting facility.aspx Edmonton, AB, Canada Co composting facility ref Aerated static piles offer process control for rapid biodegradation , and work well for facilities processing wet materials and large volumes of feedstocks. ASP facilities can be under roof or outdoor windrow composting operations, or totally enclosed in vessel composting , sometimes referred to tunnel composting. ref http www.faqs.org abstracts Environmental services industry Batch tunnel composting in Europe Regionally coordinated composting opportunities composting view.html Batch tunnel composting in Europe ref Aeration Image CVRD4chamber.air.jpg thumb right Aeration system for a closed chamber composting facility The aeration system uses fans to push and or pull air through the composting mass. Rigid or flexible perforated piping, connected to fans, delivers the air. The pipes can be installed in channels, on top of a floor, or included throughout the pile during buildup. In large scale systems, forced aeration is accompanied with a computerized monitoring system responsible for controlling the rate and schedule of air delivery to the composting mass ... more details
will return to its pre aeration condition. Therefore the benefits of aeration will not be fulfilled ... such as ease of use, selective aeration, and economy. Brands The main brands of aerators in the United ... more details
Image DoubleDig.gif right Double digging with spade and fork loosens the soil, to increase drainage and aeration. Double digging is a gardening technique used to increase soil drainage and aeration. It involves the loosening of two layers of soil , and the addition of organic matter. Double digging is typically done when cultivating soil in a new garden, or when deep top soil is required. On poor or heavy soils, or for vegetable gardens, double digging might be required every 3 5 years. In other cases, double digging is only really needed on starting a new garden, or on total replanting. First the top layer is dug off with a spade, forming a shallow trench, and then the under layer at the bottom of the trench is dug with a fork. When breaking up the lower layer, organic matter such as compost is usually added to the soil. If the soil is in need of other minerals like gypsum or phosphorus this can also be added here. A second trench is then started, backfilling the first trench. This process is repeated until the whole bed has been treated. There will be soil left over from the first trench, which is used to fill the last trench. Walking on top of the bed will crush flatten it, so the gardener must be sure to protect the double dug garden from too much foot traffic. ref http www.simplegiftsfarm.com double digging.html ref References reflist External links http www.rhs.org.uk advice profiles0105 double digging.asp http www.farm garden.com feature double digging gardeners workout http www.organicgardening.com feature 0,7518,s1 5 19 934,00.html Category Horticulture and gardening Horticulture stub ... more details
refimprove date March 2011 McLaren Lake Regional Park is located in the southwest part of the Province of Saskatchewan , near the villages of Richmound, Saskatchewan Richmound and Golden Prairie, Saskatchewan Golden Prairie, SK and Schuler, Alberta Schuler, AB . The lake is approximately 2 km long and 0.5 km wide with the park area located on the east end. The lake has been stocked with rainbow trout over the last number of years and five wind power ed Water aeration aeration systems have been installed to oxygenate the lake during the winter months. The regional park, open from May 1st to September 15th, has powered and unpowered campsite s, firepit s, sewage disposal , a concession stand , camp kitchen, playground , shower s, flush toilet s, ball diamond , horseshoe pit s, dock and beach area. References See Wikipedia Footnotes on how to create references using ref ref tags which will then appear here automatically Reflist External links http www.richmound.ca mclarenlake.html Categories coord missing Saskatchewan Category Articles created via the Article Wizard Category Regional parks of Canada Category Parks in Saskatchewan ... more details
File Boyle air pump.jpg thumb right Boyle s air pump An air pump is a device for pushing air. Examples include a bicycle pump , pumps that are used to aeration aerate an aquarium or a pond via an airstone a gas compressor used to power a pneumatic tool , air horn or pipe organ a bellows used to encourage a fire a vacuum cleaner and a vacuum pump . The first effective air pump constructed in England for scientific purposes was made in 1658 by Robert Hooke for Robert Boyle . ref citation journal Proceedings of the Royal Society of Edinburgh title On the Early History of the Air pump in England author George Wilson date Jan 15th, 1849 url http books.google.co.uk books?id QNosAAAAYAAJ&pg PA207 ref References reflist Category Pumps engineering stub ... more details
File Green compost bin.JPG thumb right A modern compost bin constructed from plastics The following page contains a list of different composting systems Home composting small scale Composting toilet Container composting German mound Sheet composting Trench composting Vermicomposting Industrial composting large scale Image CVRD4chamber.air.jpg thumb right Aeration system for a closed chamber composting facility Aerated Static Pile Composting Anaerobic digestion High fibre composting In vessel composting Mechanical biological treatment Tunnel composting Vermicomposting Windrow composting See also Compost Composting Category Composting ... more details
See entrainment for other types. Entrainment as commonly used in various branches of engineering may be defined as the entrapment of one substance by another substance. ref cite book author Perry, R.H. and Green, D.W. Editors title Perry s Chemical Engineers Handbook edition Sixth Edition publisher McGraw Hill year 1984 isbn 0 07 049479 7 ref For example The entrapment of liquid droplets or solid particulates in a flowing gas , as with smoke . The entrapment of gas bubbles or solid particulates in a flowing liquid, as with aeration . Given two mutually insoluble liquids, the emulsion of droplets of one liquid into the other liquid, as with margarine . Given two gases, the entrapment of one gas into the other gas. Air entrainment The intentional entrapment of air bubbles into concrete. See also Souders Brown equation References reflist engineering stub Category Chemical engineering ... more details
diffused aeration Submerged diffused air is essentially a form of a Diffuser sewage diffuser grid inside a lagoon. There are two main types of submerged diffused aeration systems for lagoon applications ... or medium bubble diffusers to provide aeration and mixing to the process water. The diffusers can be suspended ... treatment technologies Retention basin Rotating biological contactor Sewage treatment Water aeration ... more details
management problems is to eliminate or lesson thermal stratification through aeration . ref Lackey 1972a ref Many types of aeration equipment have been used to thermally destratify lakes. Aeration has ... methods of aeration to prevent winterkill. Progressive Fish Culturist. 34 3 175 178. http www.tandfonline.com ... Freshwater ecosystems Water column Lake aeration aquatic ecosystem topics Category Lakes Stratification ... more details
fixed to the floor of the tank. p No aeration mixing is provided in the third stage and the settling ... liquor exits the tank. Removal of Constituents Aeration times vary according to the plant size ... sbr manual.pdf ref The settling stage is usually the same length in time as the aeration. During this stage ... Remote Water Services, Aust. http www.bio bubble.com BIO BUBBLE ADVANCED AERATION SBR References Reflist ... more details
to the head of the aeration system to re seed the new wastewater entering the tank. This fraction .... Many sewage treatment plants use axial flow pump s to transfer nitrified mixed liquor from the aeration ... items Aeration tank where air or oxygen is injected in the mixed liquor. Settling tank usually referred .... Package plants are commonly variants of extended aeration , to promote the fit & forget approach ... liquor around the ditch and provide aeration. ref name Beychok These are oxidation ditches, often ... can be high. Surface aerators are commonly quoted as having an aeration efficiency of 0.5 1.5 kg O sub 2 sub kWh, diffused aeration as 1.5 2.5 kg O sub 2 sub KWh. Deep Shaft claims 5 8 kg O sub 2 sub ... vessels operate at between 4 C and 32 C. ref name Basin Aeration methods Diffused Aeration Image DualAir Grid System.jpg thumb 200px right Fine bubble membrane diffusers in an aeration tank Sewage liquor is run into deep tanks with Diffuser sewage diffuser grid aeration systems that are attached to the floor ... Modeling activated sludge Y. Heymann, 2010 http www.aerator.be Why surface aeration? Comparison between surface aerators or low speed turbines and fine bubble bottom aeration. Category Sewerage ... more details
File Queen s Quay and Lagan Weir, Belfast, April 2010.JPG right thumb 200px Lagan Weir, viewed from Queen s Quay, April 2010 File Lagan Weir.jpg right thumb 200px Lagan Weir at night, September 2011 Image Belfast 055 , October 2009.JPG right thumb 150px Lagan Weir, October 2009 The Lagan Weir , completed in 1994, at a cost of 14m, is located across the River Lagan, Northern Ireland Lagan between the Queen Elizabeth Bridge and the M3 bridge completed around the same time in Belfast , Northern Ireland . The Lagan Weir was jointly funded by the Corporation and the European Commission it was constructed by Charles Brand Ltd and designed by Ferguson and McIlveen. The weir is a series of massive steel barriers which are raised as the tide retreats to keep the river at an artificially constant level. This improvement to the sewerage system combined with massive dredging of the river by mechanical excavators, and installation of an underwater aeration system, has led to a marked improvement in water quality and the environment around the river. Lagan Weir,dredging and aeration have increased water quality in the river and salmons returning. An otter and seals have followed the fish that now move up river to spawn in what was once an aquatic death trap. The objective of the structure is to keep the level of the river artificially constant, as it is a tidal river the level of the water varied by up to three metres between high and low tide. This exposed mudflats which were unsightly and emitted a strong odour, particularly in the summer months. The transformation of the riverside by the construction of the weir has been a catalyst for development along the riverside. Another part of the project is the Lagan Lookout centre which explains the history and function of the weir as well as the history of the Lagan itself. Commons category Lagan Weir External links http www.laganside.com laganweir.asp Laganside Official Website http www.harrisonphotography.co.uk library getimgs.cfm? ... more details
The Non limiting water range NLWR represents the range of water content in the soil where limitations to plant growth such as water potential , air filled porosity , or soil strength are minimal. John Letey 1985 from UC Riverside introduced the NLWR concept in an attempt to integrate several physical properties associated with plant or root growth to refine the concept of available water capacity . Alvaro Pires da Silva, Bev Kay. and Ed Perfect University of Guelph , Ontario 1994 refined the concept and termed it least limiting water range LLWR . The upper limit wet end of LLWR is determined not only at water content at field capacity FC , but also the capability of providing adequate aeration for plant roots usually taken as a minimum air filled porosity of 10 . The upper limit is then defined as min q air filled porosity 0.1, FC . Rather than air filled porosity at 10 , LaoSheng Wu from UC Riverside proposed moisture content where Oxygen gas diffusion in soil gas diffusion rate ODR value of 0.2 micro g cm2 min as criteria for satisfactory aeration status. The lower limit dry end is not only limited to permanent wilting point PWP but also the ability of root penetration. This is measured as soil mechanical resistance taken at an arbitrary value, say penetration at 3 MPa. The lower limit is defined as max q mechanical resistance 3 MPa, PWP . See also Integral energy Irrigation scheduling Limiting factor Moisture equivalent Soil plant atmosphere continuum Moisture stress Pedotransfer function References Da Silva A P, Kay B D and Perfect E 1994 Characterization of the least limiting water range of soils. Soil Sci. Soc. Am. J. 58, 1775 1781. Letey J 1985 Relationship between soil physical properties and crop production. Adv. Soil Sci. 1, 277 294. Category Soil physics ... more details
Encyclopedia
top
