Decomposer


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decomposer

[de·kəm′pō·zər]
(ecology)
A heterotrophic organism (including bacteria and fungi) which breaks down the complex compounds of dead protoplasm, absorbs some decomposition products, and releases substances usable by consumers. Also known as microcomposer; microconsumer; reducer.

Decomposer

 

an apparatus that decomposes aluminate solutions in order to isolate crystalline aluminum hydroxide.

A decomposer is fitted with a mechanical stirrring device or an air mixer. A decomposer with mechanical stirring consists of a steel tank (diameter and height, 8 m), inside which a chain stirrer turns slowly in order to keep the seeding crystals in suspension. Air-stirred decomposers have come into extensive use (height, about 30 m; diameter, 8 m; available capacity, over 1,000 cu m). The stirring equipment consists of two vertical tubes along the decomposer’s axis. The inner tube, through which compressed air is sent under a pressure of 0.5 meganewtons per sq m, is 300 mm shorter than the outer one.

Air mixing with the solution forms an air-pulp mixture less dense than the pulp itself. Rising through the space between the tubes, this mixture attracts adjacent layers of pulp, mixes with them, and creates continuous upward motion of the pulp. Decomposers are connected in series (10-15 units). The aluminate solution and seeding are sent continuously to the head decomposers of each series, while the hydrated pulp is removed continuously from the tail end.

REFERENCES

Lainer, A. I. Proizvodstvo glinozema. Moscow, 1961.
Beliaev, A. I. Metallurgiia legkikh metallov, 6th ed. Moscow, 1970.

A. I. LAINER


Decomposer

 

a saprophytic organism that mineralizes dead organic matter, that is, breaks organic matter down into more or less simple inorganic compounds. The overwhelming majority of decomposers are microorganisms that live in soil and water. They belong to the group of consumers.

References in periodicals archive ?
Five students had p-prims at the pre-interview associated with the idea that decomposers break things down.
17], t) are first augmentation coefficients for category 1, 2 and 3 due to decomposer organism.
The classic "recomposer" is the compost heap, a highly bioactive mess of organic debris on its way back to soil, driven by trillions of microbes and other decomposer organisms.
Large molecular weight compounds found in leaves such as lignin also play a role in slowing down the decomposition process as decomposers must first release enzymes to break down these large molecules (Melillo and others 1982).
It is important that no deposition of nickel should occur on the walls of the decomposer or on the gas inlets, otherwise pellets would become cemented to the surfaces over a long period of time.
10) Balthazar's citation echoes the definition of "chemistry": "Art de decomposer ou d'analyser les corps, et de les recomposer de nouveau.
Of particular note is the presence of Dermestes ater in this study, as compared to Dermestes carnivorus, as the primary decomposer.
The answer should be the fungus or a small insect or small animal such as a worm -- the decomposer.
Nutrients that remain in the nest chamber will enter detrital and decomposer food chains through organisms such as bacteria, fungi, ants, fly and beetle larvae, and crabs (Dodd 1988).
The standard deviation of decomposer density among microcosms declined strongly as S/F increased, independently of light and nutrient levels.
So much organic matter is available in the Ciso pool that the decomposer organisms, by oxidizing it, completely exhaust the oxygen in their environment, while the sulphate-reducing organisms living in the sediment produce large amounts of sulphides throughout the entire year.