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What is the cost-benefit relationship regarding sewage treatment as a method to fight water pollution?
To treat sewage is much cheaper for society. The non treated sewage pollutes rivers, lakes and the sea, being a cause of diseases transmitted by water. For the society the costs of these diseases are much higher than the cost of the sewage treatment.
One of the most economical systems to treat sewage is the aerobic treatment system, reservoirs kept much oxygenated for aerobic bacteria to decompose organic material.
An experiment supported by NASA calculated the heights of 6 men rapidly before going to bed, and then again after 3 days of bed rest. The data were as follows: What is the 95% con
Aerobic Based Water Treatment: Waste water provides organic materials and inorganic nutrients to river waters; this is known as eutrophication. This promotes microbial and plan
Fatty liver or fat cow syndrome (hepatic lipidosis, pregnancy toxaemia in cattle) Fatty liver or hepatic lipidosis is a major metabolic disease of dairy cows. It is caused by
The cardiovascular system controls the movement of blood through thousands of miles of capillaries so that every tissue in every part of the body is perfused. Essential nutrients
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Define Soyabean and sesame proteins - mutual supplementation of Protein? Soyabean and sesame proteins: Soyabean proteins are good sources of lysine but are deficient in methion
Diesel-like liquid obtained from materials of biological origin is called biodiesel. Biodiesel can be obtained (i) either from lipids accumulated plants and algae or (ii) from
Comparison of CABG and Angioplasty : Results of six major randomized clinical trials of multi vessel angioplasty Vs CABG are now available. The main conclusions are: Patient
Ichnology : This is the study of foot prints. Ichnology is a type of branch of geology which deals with traces of organismal behavior like as burrows or footprints. It is commonly
Why Dairy or milk product are important for human body? This first food of mammals is rich in body-building proteins and bone-forming calcium, besides being the only source of
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