Destroying What Is Crucial To Life Water

1232 words - 5 pages

Water is crucial for all aspects of life, the defining feature of our planet. Ninety seven and a half per cent of all water is found in the oceans, of the remaining fresh water only one percent is accessible for extraction and use. Functioning and healthy aquatic ecosystems provide us with a dazzling array of benefits – food, medicines, recreational amenity, shoreline protection, processing our waste, and sequestering carbon. At the beginning of the 21st century, the world faces a water crisis, both of quantity and quality, caused by continuous population growth, industrialization, food production practices, increased living standards and poor water use strategies. Wastewater management or the lack of, has a direct impact on the biological diversity of aquatic ecosystems, disrupting the fundamental integrity of our life support systems, on which a wide range of sectors from urban development to food production and industry depend. It is essential that wastewater management is considered as part of integrated, ecosystem-based management that operates across sectors and borders, freshwater and marine.
Wastewater, also written as wastewater, is any water that has been adversely affected in quality by anthropogenic influence. It comprises liquid waste discharged by domestic residences, commercial properties, industry, and/or agriculture and can encompass a wide range of potential contaminants and concentrations. In the most common usage, it refers to the municipal wastewater that contains a broad spectrum of contaminants resulting from the mixing of wastewater from homes, businesses, industrial areas and often storm drains, especially in older sewer systems. Municipal wastewater is usually treated in a combined sewer, sanitary sewer, effluent sewer or septic tank.
Sewage is the subset of wastewater that is contaminated with feces or urine, but is often used to mean any wastewater. Sewage includes domestic, municipal, or industrial...
Everything entering the sewage plant is screened so that the plant machinery is not damaged. Sticks, rags, sand, toys, dead animals & plastic bags are removed by passing everything through giant screens (sieves). The rubbish collected is usually disposed of in a landfill. The mixture (sludge) is then aerated. This is when good bacteria (tiny organisms) are used to break down and eat the sludge. Aeration can take from 4 hours to several days, during which time the sludge breaks down. It is then carried to the clarifier.
In the clarifier, the solid particles in the mixture are attracted together and settle to the bottom, separating from the wastewater. The water can then be diverted. This water will still have lots of nutrients in it. The next stage is to make sure that the nutrients are removed before the water is released back into the environment. Various methods may be used to "clean" the water including sand filters, reed beds, grass plots and disinfection.
The solids can now, either go straight to the...

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