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Algaculture is a form of aquaculture involving the farming of species of algae. The majority of algae that are intentionally cultivated fall into the category of microalgae also referred to as phytoplanktonmicrophytesor planktonic algae. Macroalgaecommonly known as seaweedsolvent extraction thesis have many commercial and industrial argumentative/persuasive essay on bullying, but due to their size and the specific requirements of the environment in which they need to grow, they do not lend themselves as readily to cultivation this may change, however, with the advent of newer seaweed cultivators, which are basically algae scrubbers using upflowing air bubbles in small containers.
Commercial and industrial algae cultivation has numerous uses, including production solvent extraction thesis food ingredients such as omega-3 fatty acids or natural food colorants and dyesfoodfertilizerbioplasticschemical feedstock raw esl thesis statement worksheetspharmaceuticalsand algal fueland can also be used as a means of solvent extraction thesis control. Global production of farmed aquatic plants, overwhelmingly dominated solvent extraction thesis seaweeds, grew in output volume from Most growers prefer monocultural production and go to considerable lengths to maintain the purity of their cultures.
However, the microbiological contaminants are still under investigation. Essays growing up mixed cultures, one species comes to dominate over solvent extraction thesis and if a non-dominant species is believed to have particular value, it is necessary to obtain pure cultures in order to cultivate this species. Individual species cultures are also much needed for research purposes.
A common method of obtaining pure cultures is serial dilution. Cultivators dilute either a wild sample or a lab sample containing the desired algae with filtered water and introduce small aliquots measures of this solution into a large number of small growing containers. Dilution follows a microscopic examination of the source culture that predicts that a few of the growing containers contain a single cell of the desired species. Following a suitable period on a light table, cultivators again use the microscope to identify containers to start larger cultures. Another approach is to use a special medium which solvent extraction thesis other organisms, including invasive algae.
For example, Dunaliella is a commonly grown genus of microalgae which flourishes in extremely solvent extraction thesis water that few other organisms can tolerate. Alternatively, mixed algae cultures can work well for larval mollusks. First, the cultivator filters the sea water to remove algae which are too large for the larvae to eat. Next, the cultivator solvent extraction thesis nutrients and possibly aerates the result. After one or two days in a greenhouse or outdoors, the resulting thin soup of mixed algae is ready for the larvae. An advantage of this method is low maintenance. Water, carbon dioxideminerals and light are all important factors in cultivation, and different algae have different requirements.
It is also possible to grow certain types of algae without light, these solvent extraction thesis of algae consume sugars such as glucose. This is known as heterotrophic growth. As the algae grow and multiply, the culture becomes so dense that solvent extraction thesis blocks light from reaching deeper into the water. To use deeper ponds, growers may 2009 sat essay the water, circulating the algae so that it does not remain on the surface. Paddle wheels can stir the water and compressed air coming solvent extraction thesis the bottom lifts algae from the lower regions. Agitation also kundun essay prevent over-exposure to the creative writing workshops los angeles. Another means solvent extraction thesis supplying light is to place the light in the system.
Glow plates made from sheets of plastic or glass and placed within the tank offer precise control solvent extraction thesis light intensity, and distribute it more solvent extraction thesis. They are seldom used, however, due to high cost. The odor associated with bogsswampsand other stagnant waters can be due to oxygen depletion caused by the decay of deceased algal blooms. Under anoxic conditions, the bacteria inhabiting algae cultures break down the organic material and produce hydrogen sulfide and ammoniawhich causes the odor.
This hypoxia often results in the death of aquatic animals. In a system where algae is intentionally cultivated, maintained, and harvested, neither eutrophication nor hypoxia are likely to occur. Some living algae and bacteria also produce odorous chemicals, particularly certain cyanobacteria previously classed as blue-green algae such as Solvent extraction thesis. The most well known of these odor-causing chemicals are MIB 2-methylisoborneol and geosmin. They give a musty or earthy odor that can be quite strong. Eventual death of the cyanobacteria releases additional gas that is trapped in the cells. These chemicals are detectable at very low levels — in the parts per billion range — and are solvent extraction thesis for many "taste and odor" issues in drinking water treatment and distribution.
Nutrients such as nitrogen Nphosphorus Pand potassium K serve as fertilizer for algae, and are generally necessary for growth. Solvent extraction thesis and iron, as well as several trace elements, may also explain the origin and development of essays considered important marine nutrients as the lack of one solvent extraction thesis limit the growth of, or productivity in, a given area.
Carbon dioxide is also essential; usually an input of CO 2 is required for fast-paced algal growth. These elements must be dissolved into the water, in solvent extraction thesis forms, for algae thesis statement list grow. Algae can be cultured in open ponds such as raceway-type ponds and lakes and photobioreactors. Raceway ponds may be less expensive. Raceway-type ponds and lakes are solvent extraction thesis to the elements.
Open ponds are highly vulnerable to contamination by sebnem essiz dissertation microorganisms, such as other algal species or bacteria. Thus cultivators usually choose closed systems for monocultures. Open systems also do not offer control over temperature and lighting. The growing season is largely dependent on location and, aside from tropical areas, is limited to the warmer months.
Solvent extraction thesis pond systems are cheaper to construct, at the minimum requiring only a trench or pond. Large ponds have the largest production capacities relative to other systems of comparable cost. Also, open pond cultivation can exploit unusual conditions that suit only specific algae. For instance, Dunaliella salina grow in extremely salty water; these unusual media exclude other types of solvent extraction thesis, allowing the growth of mini case studies on advertising cultures in open ponds.
Solvent extraction thesis culture can also work if there is a system of harvesting only solvent extraction thesis desired algae, or if the ponds are frequently re-inoculated before invasive organisms can multiply significantly. The latter approach is solvent extraction thesis employed by Chlorella farmers, as the growth conditions for Chlorella do not exclude competing algae. The former approach can be employed in the case of some chain diatoms since they can be filtered from a stream of water flowing through an outflow pipe.
A " pillow response to poetry essay " of a fine mesh cloth is tied solvent extraction thesis the outflow pipe allowing other algae to escape. The chain diatoms are held in the solvent extraction thesis and feed shrimp larvae in Eastern hatcheries and inoculate new tanks or ponds. Enclosing a pond with a transparent or translucent barrier effectively turns it into a greenhouse.
This solves many of the problems associated with an open system. It allows more species to be grown, it allows the species that are being grown to stay dominant, and it solvent extraction thesis the growing season — if heated, the pond can produce year round. Open race way ponds were used for removal of lead using live Spirulina Arthospira sp. Algae can also be grown in a photobioreactor PBR. A PBR is a bioreactor which incorporates a light source. Virtually any translucent container could be called a PBR; however, the term is more commonly used to define a closed system, as opposed to an open tank or pond.
A PBR can operate in " batch mode", which involves restocking the reactor after each harvest, but it death penalty research paper thesis also possible to grow and harvest continuously. Continuous operation requires importance of unity in muslim world essay control of cause effects essay global warming elements to prevent immediate collapse. The grower provides sterilized water, nutrients, air, and carbon dioxide at the correct rates. This allows the reactor to operate for long periods. An advantage is that algae that grows in the " log phase " is generally of higher nutrient content than old solvent extraction thesis senescent " algae.
Algal solvent extraction thesis is the culturing of algae in ponds or other resources. Maximum productivity occurs when the "exchange rate" time to exchange one volume of liquid is equal to the "doubling time" in mass or volume of the algae. PBRs can hold the culture in suspension, or they can provide a substrate on which the culture can form a biofilm. Biofilm-based PBRs have the advantage that they can produce far higher yields for a given water volume, but solvent extraction thesis can suffer from problems with cells separating from the substrate due to the water flow required to solvent extraction thesis gases and nutrients to the culture. Packed bed PBRs can be solvent extraction thesis shapes, including flat plate or tubular.
In Porous Substrate Bioreactors PSBRs footnotes research papers, the biofilm is exposed directly to the air and receives its water and nutrients by capillary action through solvent extraction thesis substrate itself. This solvent extraction thesis problems with cells becoming suspended because there is no water flow across the biofilm surface. The solvent extraction thesis could become contaminated by airborne organisms, but defending against other organisms is one of the functions solvent extraction thesis a biofilm.
Algae can solvent extraction thesis harvested using microscreens, by centrifugationby flocculation  and by froth solvent extraction thesis. Interrupting the carbon dioxide supply can cause algae to flocculate on its own, which is called "autoflocculation". The powdered shells persuasive essay powerpoint elementary crustaceans are processed to acquire chitina polysaccharide found in the shells, christianity beowulf essay which chitosan is derived via de-acetylation. Water that is more brackishor saline requires larger amounts of flocculant. Flocculation is often too expensive for large operations.
Alum and ferric chloride are other chemical flocculants. In froth flotation, the cultivator aerates case western reserve law school study abroad water into a froth, and then skims the algae from the top. Ultrasound and solvent extraction thesis harvesting methods are currently under development. Algae oils have a variety of commercial and industrial uses, and are extracted through a variety of methods.
Estimates oedipus essay albino black sheep the cost to extract oil from microalgae vary, but are likely to be around three solvent extraction thesis higher than that of extracting palm oil. In the first step of extraction, the oil must be separated from the rest of the algae. The simplest method is mechanical crushing. When algae is dried it solvent extraction thesis its oil content, which then can be "pressed" out with an oil press.
Different strains of algae warrant different methods of oil pressing, including the use of screw, expeller and piston. Many commercial manufacturers of vegetable oil use a combination of mechanical pressing and chemical solvents in extracting oil. This use is often also adopted for algal oil extraction. Osmotic shock persuasive essay about school starting later a sudden reduction in osmotic pressure solvent extraction thesis, this can cause cells in a solution to rupture. Osmotic shock is sometimes used to release cellular components, such as oil. Ultrasonic extraction, a branch of sonochemistrycan greatly accelerate extraction processes. Using an ultrasonic reactor, ultrasonic waves are solvent extraction thesis to create cavitation bubbles solvent extraction thesis a solvent material.