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Essay/Term paper: Phosphates in water pollution

Essay, term paper, research paper:  Science Research Papers

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Phosphates in Water Pollution


Phosphates may be created by substituting some or all of the hydrogen of
a phosphoric acid by metals. Depending on the number of hydrogen atoms that are
replaced, the resulting compound is described as a primary, secondary or
tertiary phosphate. Primary and secondary phosphates contain hydrogen and are
acid salts. Secondary and tertiary phosphates, with the exception of those of
sodium, potassium and ammonium are insoluble in water. Tertiary sodium phosphate
is valuable as a detergent and water softener. The primary phosphates tend to be
more soluble.
Phosphates, which are an important component to metabolism in both
plants and animals, help in the first step in oxidation of glucose in the body.
Primary calcium phosphate is an ingredient of plant fertilizer.
Phosphates have caused increasing attention recently. The focus is on
the environmentally harmful effects in household detergents. Wastewater, from
laundering agents, contains phosphates, which are said to be a water pollutant.
Most laundry detergents contain approximately 35% to 75% sodium
triphosphate (Na5P3O10), which serves two purposes. Providing an alkaline
solution (pH 9.0 to 10.5) is necessary for effective cleansing and also to tie
up calcium and magnesium ions found in natural waters and prevent them from
interfering with the cleansing role of the detergent.
Eutrophication is the progressive over-fertilization of water, in which
festering masses of algae's blooms, choking rivers and lakes. Phosphorus
compounds act as a fertilizer for all plant life, whether free-floating algae
or more substantial rooted weeds, and are implicated in eutrophication. Many
countries control phosphate levels, whereas Switzerland has banned the use of
phosphates.
The marine environment is both fragile and more resistant than the
terrestrial ecosystem. It is fragile for the reasons that nutrients are
generally present in very low concentrations, permanently consumed by living
organisms and pollutants diffuse rapidly.
Lakes and rivers are extremely complex ecosystems. Nutrients are taken
up by both algae and rooted weeds. The weeds act as a shelter for fish larvae
and zooplankton, both of which eat algae and are, in turn, eaten by larger fish.
Scientists have concluded that unpolluted lakes can absorb surprisingly large
amounts of phosphates without uncertainty. When a fertilizer, such as a
phosphate, is added more algae will grow, and consequently will the populations
of zooplankton and fish. Difficulties only arise when the lake is already impure.
Zooplankton are sensitive to their environment and many substances are toxic to
them. If any of these substances, including phosphates, are present the
zooplankton population cannot increase. Adding phosphates to this polluted
system will case algae growth. The floating masses cut off the light supply.
Weeds die and decompose using up dissolved oxygen, and causing sulfurous smells
and plagues. Deprived of shelter and food, the fish larvae starve. The lake is
well on the way to catastrophe.
Without wetlands there would be a minimal amount of fresh drinking water
due to the fact that wetlands filter the waters of our lakes, rivers and streams,
sequentially reducing contamination of water. The plant growth in wetlands
removes phosphates and other plant nutrients washed in from the surrounding soil,
consequently restricting the growth of algae and aquatic weeds. This growth is
a serious problem in some of Canada"s major waterways, where dead and decaying
algae deprive the deeper waters of their oxygen.
Researches at Lancaster University have studied lakes whose plant and
animal life has been killed by ace lake. Contradictory, these ions also are
produced by acid rain, contain oxides of nitrogen from combustion sources. These
fertilizers do not alter the pH level of the water. Instead, they stimulate the
growth of plants. The plants absorb the dissolved nitrates, generating hydroxide
ions, which in return neutralize the excess acid.
Removal of phosphates from detergent is not likely to slow algae growth
in containing substances. It may actually prove disastrous. Its replacement with
borax will definitely be disastrous. Scientists are unsure of borax role in
plant growth. It is not required by algae and other micro plants, but it is
essential to higher plants. However in excessive quantities, about 5 micrograms
of boron per gram of water, boron severely damages plant life. Highly alkaline
substances, gel proteins and sodium hydroxide is hazardous substances. Another
concern is the fact that each year thousands of children swallow detergents
resulting in serious injuries or death.
In conclusion, the only way to overcome the disastrous effects of
phosphates is to find an alternate. However, an acceptable substitute for
phosphates has not yet been found. Washing only with synthetic detergents would
require so much detergent that the cost per wash would increase significantly.
Another alternative is the substitution of synthetic nonionic detergents for
ionic detergents in use. Nonionic detergents are not precipitated by Calcium of
Magnesium ions. This would reduce the risk contaminating our lakes and rivers.

 

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