Question
$3.00 select an environmental issue that direc
- From Biology: General-Biology
- Closed, but you can still post tutorials
- Due on May. 25, 2011
- Asked on May 25, 2011 at 1:33:56PM
Q:
select an environmental issue that directly affects you. Discuss the significance of the role of environmental science to that issue. What are the risk factors and the expected environmental consequences? What, if anything, is being done about the problem? What is the effect of politics on reducing the risk?
$10.00
Water Pollution And Its Control. The Best Answer You Can Get
- This tutorial hasn't been purchased yet.
- Posted on May 25, 2011 at 11:39:26PM
A:
Preview: ... sms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen, and as a result there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. This causes mortality of fish and other aquatic creatures. Presence of large amounts of nutrients in waters also causes excessive growth of planktonic (free-floating) algae, called an algal bloom which imparts a distinct colour to the water bodies. Algal blooms cause deterioration of the water quality and fish mortality. Some
bloom-forming algae are extremely toxic to human beings and animals. The beautiful mauve-colored flowers found on very appealingly-shaped floating plants in water bodies. These plants which were introduced into India for their lovely flowers have caused havoc by their excessive growth by causing blocks in the waterways. They grow faster than our ability to remove them. These are plants of water hyacinth (Eichhornia crassipes), the world’s most problematic aquatic weed, also called ‘Terror of Bengal’. They grow abundantly in eutrophic water bodies, and lead to an imbalance in the ecosystem dynamics of the water body. Sewage from our homes as well from hospitals are likely to contain many undesirable pathogenic microorganisms, and its disposal into a water without proper treatment may cause outbreak of serious diseases, such as, dysentery, typhoid, jaundice, cholera, etc. Unlike domestic sewage, waste water from industries like petroleum, paper manufacturing, metal extraction and processing, chemical manufacturing, etc., often contain toxic substances, notably, heavy metals (defined as eleme ...
The full tutorial is about 1263 words long plus attachments.
Water Pollution And Its Control With A Case Study.doc (32K)