Plants and pollution of environment. Sewage

you are: Plants and pollution of environment

In many areas of globe efficiency of vegetative cultures is quite often limited to a lack of mineral nutrients. The increase in quantity of fertilizers brought in soil undoubtedly allows to raise efficiency, however cost of fertilizers continuously grows also them becomes ever less. As it is not enough stocks of fertilizers and they it is frequent the expensive, the countries ' the third world ' should resort to a way of increase of crops cheap and favorable from the ecological point of view, using resources which vanish now in vain. go-go одесса

So, for example, before many densely occupied centres of globe costs now difficultly razreshimaja and a problem demanding the big expenses: how to get rid of a large quantity of the waste created by the person? During former times when population density in many countries was insignificant, a sewage without any processing dumped in the rivers and lakes, but with increase in density such way became unacceptable. Then sewage began to transform by means of microorganisms into silt which then dumped somewhere, is frequent in the sea. Similar practice which has been admissible before, involves now a number of adverse consequences, including pollution of sea coasts and occurrence of extensive underwater deserts with anaerobnymi conditions where ulovy fishes are lowered, and its specific structure is changed. легализация документов посольства саудовской Аравии therefore we are compelled to search for new decisions of a problem. One obvious possibility - to take advantage of the way applied in the east throughout millenia, i.e. To bring in appropriate way, sbrozhennoe organic substance again in soil as fertilizer. We refuse use of a sewage partly for aesthetic reasons, and partly because in human excrements to contain numerous pathogenic factors. Though causing infectious diseases viruses, microorganisms and tsisty pathogenic organisms really contain in human excrements, in the east with this problem successfully consult. A sewage collects in the big sediment bowls where they are exposed anaerobnomu to fermentation and their temperature thus considerably raises; as a result of such processing a sewage turns to the pasteurised liquid of amber colour which are deprived of a smell and not causing any associations which can be used directly for fertilizer of rice fields and other agricultural crops without any adverse consequences. Now in the USA experiments on use of such silt on wood landings and on plantations of other not food cultures are made. Сдам авто в аренду киев. one of the problems which have arisen in connection with use of silt from city sewer systems, consists that it quite often contains considerable quantities of toxic substances of an industrial origin, for example heavy metals. Such substances suppress growth of plants, and their maintenance in foodstuff is absolutely inadmissible. The decision of this problem consists not in refusal of use of the valuable nutrients containing in sewage, and in prevention sbrasyvanija industrial wastes in the water drain. With increase in a population and deepening of an energy crisis we inevitably should prosecute a subjects on use of city sewage for fertilizer of crops of food cultures, as organic in these sewage organic and mineral nutrients can become too precious to lose them in vain.

In certain cases cultural plants not simply take nutrients from sewage, but also serve as natural factory on processing of these waters. In this plan successfully apply two methods. One of them consists in razbryzgivanii sewage over the fields sowed by a grass or other cultures which take many nutrients from these waters and facilitate destruction of other substances by microorganisms so finally absolutely pure water filters into system of ground waters. As effective cleaners of water can serve also grassy, bogs if to pass a stream of strongly dissolved sewage through dense vegetation of these bogs. Such process is especially convenient for tent small towns, camp parking and similar places which are too small that it made sense to build special installations for processing of a sewage. The vegetative material formed as a result can be ploughed in soil as green fertilizer or to use on a forage to cattle.

Water plants, in particular seaweed, can help to reconcile resistance observed now to use of sewage as fertilizer and escalating requirement for fertilizers. Sewage with the high maintenance of organic substance lower in the settling ponds sowed by seaweed; it allows to receive huge quantities of green weight which can be collected and without any risk to feed a pet instead of using for this purpose other plants, for example soybeans which are suitable not only on a forage to cattle, but also can be used in food by the person. One of blue-green seaweed, Spirulina, can even grow in the alkaline salted waters. In Africa inhabitants of the areas adjoining to lake Chad, use this vodorosl in food, and it is for them the main source of fiber. Now in Mexico and in the USA experiments are made to define possibility of its use as foodstuff. Apparently, addition Spirulina in porridges and other products does not change their taste and does not create any undesirable by-effects.