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The purpose of this review is to present and discuss current knowledge on the role played by bacteria in the carbon cycle of ecosystems.
The ecological experience of the authors explains why our examples are mainly derived from aquatic systems; many of the discussed principles, however, apply equally well to terrestrial systems.
L., 1971, Dissolved organic carbon utilization in size fractionated algal and bacterial communities, Int.
A., 1964, An idealized model of dissolved sulfate distribution in recent sediments, Geochim. E., 1974b, Interrelations between sulfate-reducing and methane-producing bacteria in bottom deposits of a fresh-water lake.
G., 1972, Some observations on the release of dissolved organic carbon by the sea urchin Strongylocentrotus droebachiensis, Limnol. J., 1968, Denitrification in the oxygen minimum layer of the eastern tropical Pacific Ocean, Deep-Sea Res. T., 1970b, The effect of a deposit-feeding amphipod on the metabolism of benthic microflora, Limnol.
T., 1972, Aerobic decomposition of sediment and detritus as a function of particle surface area and organic content, Limnol. M., 1960, Energy metabolism as related to body size and respiratory surfaces, and its evolution, Rep. R., 1972, The fate of nitrogen in aquatic ecosystems, Eutrophication Information Program, University of Wisconsin, Literature Review No.
F., 1958, The question of the role of bacterial numbers in the development of Cladocera in natural conditions, Dokl Biol Sci. G., 1974, Release of dissolved organic matter by autolysis of a submerged macrophyte submerged macrophyte, Scirpus subterminalis, Limnol. J., 1973, Some precautionary comments on the Romanenko technique for estimating heterotrophic bacterial production, Bull. W., 1974, Bacterial uptake of dissolved organic matter in relation to detrital aggregation in marine and freshwater systems, Limnol.
M., 1975, Utilization of marine plants and their constituents by bacteria isolated from the gut of echinoids (Echinodermata), Mar. I., 1965, On the trophic role of chemosynthesis and bacterial biosynthesis in water bodies, Mem. I., 1972, The bacterial population and the process of hydrogen sulphide oxidation in the Black Sea, J. Because of the mechanical dosing system, this technology is most appropriate where trained maintenance staff, constant power supply, and spare parts are available. In fact the one environmental requirement common to all microorganisms is the presence of free water, and in a sense all microorganisms are aquatic organisms.

A., 1967, The occurrence and distribution of methane in the marine environment, Deep-Sea Res. Y., 1974, Heterotrophic potential for amino acid uptake in a naturally eutrophic lake, Appl.
E., 1974a, Interrelations between sulfate-reducing and methane-producing bacteria in bottom deposits of a fresh-water lake. A., 1974, Interrelations between sulfate-reducing andmethane-producing bacteria in bottom deposits of a fresh-water lake.
H., 1975a, Chemical changes during the seasonal cycle of growth and decay in eelgrass (Zostera marina) on the Atlantic coast of Canada, J. B., 1976, August Putter, August Krogh, and modern ideas on the use of dissolved organic matter in aquatic environments, Biol. R., 1964, Zur Chemie und Biochemie der Zersetzung von Susswasserorganismen, unter besonderer Berucksichtigung des Abbaues der organischen Phosphorkomponenten, Verh. R., 1959, A search for the rubentschikii group of Desulphovibrio, Antonie van Leeuwenhoek J. O., 1971, Interaction between some tubificid oligochaetes and bacteria found in the sediments of Toronto harbour, Ontario, J. Since vertical flow constructed wetlands are able to nitrify, they can be an appropriate technology in the treatment process for wastewater with high ammonium concentrations. K., 1972, Interspecific interactions andselective feeding by tubificid oligochaetes, Limnol. K., 1969, The relationship between dissolved nutrient salts and protein production in submerged autumnal leaves, Verh. H., 1972, The role of inert particulate matter in the activity of aquatic microorganisms, Mem. Allocation of the components of the carbon-budget and the significance of the secretion of dissolved organic material, J.
M., 1967, Transported turtle grass as a source of organic enrichment of abyssal sediments off North Carolina, Deep-Sea Res. Vertical flow constructed wetlands are best suited to warm climates, but can be designed to tolerate some freezing and periods of low biological activity.[no-ecompendium] Shade from plants and protection from wind mixing is limiting the dissolved oxygen in the water. L., 1972, Metabolism of dissolved and particulate detrital carbon in a temperate hard-water lake, Mem.
Size distribution of population and relationship between respiration and incorporation of growth substrates, J. The water flows vertically down through the filter matrix to the bottom of the basin where it is collected in a drainage pipe. Constructed wetlands allow for the combination with aquaculture and agriculture (irrigation) what contributes to the optimisation of the local water and nutrient cycle.Depending on the volume of water, and therefore the size of required land surface, wetlands can be appropriate for small sections of urban areas or more appropriate for peri-urban and rural communities.

C., 1973, A relationship between heterotrophic utilization of organic acids and bacterial populations in West Blue Lake, Manitoba, Limnol.
It is a good treatment technology for communities that already have a primary treatment facility. J., 1972, An experimental study of the breakdown of cellulose in fast-flowing streams, Mem.
J., 1972, A study of the distribution and activity of microorganisms in ocean water, Limnol Oceanogr. The filtered water of a well functioning constructed wetland can be used for irrigation, aquaculture, groundwater recharge or is discharged in surface water. In this case, the hybrid constructed wetland maybe combined with a [3664-solids-free sewer system].Constructed wetlands are natural systems and do not require electrical energy (unless for pumps), nor chemicals, although the wetland will require some maintenance for the duration of its life.
165–179, Research Division Monograph 3, Virginia Polytechnic Institute and State University, Blacksburg, Virginia.McRoy, C. P., 1970, Standing stocks and other features of eelgrass (Zostera marina) populations on the coast of Alaska, J. A., 1971, Vertical distribution of the activity of the respiratory electron transport system in marine plankton, Limnol. E., 1967, Studies of the release of dissolved free amino acids by marine zooplankton, Limnol. Z., 1974, A preliminary study of feeding rates on bacterial food by adult females of a benthic nematode, Plectus palustris de Man 1880, Pol. Duebendorf: Swiss Federal Institute of Aquatic Science (EAWAG), Department of Water and Sanitation in Developing Countries (SANDEC).
181–194, Research Division Monograph 3, Virgina Polytechnic Institute and State University, Blacksbury, Virginia.Hobbie, J. J., 1958, The food relationships of the microbenthos, with particular reference to that found at Whitstable, Kent, Ann. A., 1969, Oxygenation of hydrogen sulfide in sea water at constant salinity, temperature, and pH, Environ.
C., 1969, Respiration corrections for bacterial uptake of dissolved organic compounds in natural water, Limnol.
Duebendorf, Switzerland: Swiss Federal Institute of Aquatic Science and Technology (Eawag). Duebendorf, Switzerland: Swiss Federal Institute of Aquatic Science and Technology (EAWAG) and Water Supply and Sanitation Collaborative Council (WSSCC).

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