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Nutrient pollution, a form of water pollution, refers to contamination by excessive inputs of nutrients.It is a primary cause of eutrophication of surface waters (lakes, rivers and coastal waters), in which excess nutrients, usually nitrogen or phosphorus, stimulate algal growth. [1]
Finally, nitrogen load at the Columbia River mouth is about 2-20 times larger than that at the Canadian border. [4] This gradient in nitrogen distribution is partly a result of the inputs of the Columbia's major tributaries, the Snake River and the Willamette River. The Snake and Willamette rivers together contribute about 50-80 percent of the ...
Aquatic and marine dead zones can be caused by an increase in nutrients (particularly nitrogen and phosphorus) in the water, known as eutrophication. These nutrients are the fundamental building blocks of single-celled, plant-like organisms that live in the water column, and whose growth is limited in part by the availability of these materials.
Seaweed, such as kelp, also absorbs phosphorus and nitrogen [104] and is thus helpful to remove excessive nutrients from polluted parts of the sea. [105] Some cultivated seaweeds have very high productivity and could absorb large quantities of N, P, CO 2 , producing large amounts of O 2 having an excellent effect on decreasing eutrophication ...
In a large scale study, 114 lakes were monitored for the effectiveness of alum at phosphorus reduction. Across all lakes, alum effectively reduced the phosphorus for 11 years. While there was variety in the longevity (21 years in deep lakes and 5.7 years in shallow lakes), the results express the effectiveness of alum at controlling phosphorus ...
A new model was developed to gauge the nitrogen load in estuaries. The tests were conducted using LEACHN simulations and GIS based land data, this method proved to be successful in gauging the nutrient flow in the surrounded groundwater. [4]
Furthermore, in every year since the full-scale implementation of the biological nitrogen removal (BNR) process was completed in 2000, Blue Plains has every year successfully achieved and exceeded that goal of a 40 percent reduction. In Fiscal Year 2009, the BNR process at Blue Plains reduced the nitrogen load by more than 58 percent. [5]
According to The Washington Post, phosphorus keeps "minerals from interfering with the cleaning process and prevent food particles from depositing again on dishes." [ 16 ] According to Time magazine, "One reason detergent makers have been using large amounts of phosphorus is that it binds with dirt and keeps it suspended in water, allowing the ...