Muncipal water treatment , Biology

Assignment Help:

The modern water treatment plan is often called upon to perform wonders with the water fed to it.  The clear, safe , even tasteful water that comes from a faucet may have started as a murky liquid pumped from a polluted river laden with mud and swarming  with bacteria. Or, its source may have been well water, much   too hard for domestic use and containing high levels of stain-producing dissolved iron and manganese. The water treatment plant operator's job is to make sure that the water plant product presents no hazards to the consumer.

A schematic diagram of a typical municipal water treatment plants is shown in fig. 2.1. This particular facility treats water containing excessive hardness and a high level of iron. The raw water taken from wells first goes to an aerator. Contact of water with air removes volatile solutes such as hydrogen sulfide, carbon di-oxide, methane, and volatile odorous substances such as methane thiol (CH3SH) and bacterial metabolites. Contact with oxygen also aids iron removal by oxidizing soluble iron (II) to insoluble iron (III). The addition of limes as CaO or Ca(OH)2 after aeration raises the pH and results in the formation of precipitates containing the hardness ions Ca+2 and Mg+2. These precipitates settle from the water in a primary basin. Much of the solid material remains in suspension and requires the addition of coagulants (such as iron III and aluminum sulphates) to settle the colloidal particles. The setting occurs in a secondary basin after the addition of CO2 to lower the pH. Sludge from both the primary and secondary basins is pumped to a sludge lagoon. The water is finally chlorinated, filtered and pumped to the city water mains.

 

 


Related Discussions:- Muncipal water treatment

Define fluid and electrolytes requirements in elderly, Define Fluid and Ele...

Define Fluid and Electrolytes requirements in elderly? Care lo be taken that adequate fluid be given to the elderly. If patient is unable to take the required daily needs, then

Osteogenesis - production of bone on soft tissue, Osteogenesis: Production ...

Osteogenesis: Production of Bone on Soft Tissue Now that we know the players in bone adaptation, we will look at the ways in which bone may be created and modified. There are t

Structures in the Dermis, list of the structures you would expect to find i...

list of the structures you would expect to find in the dermis.

Ventricular septal defect might be cyanotic, A newborn baby with a patent f...

A newborn baby with a patent foramen ovale or a ventricular septal defect might be cyanotic (blue). Will a two-year-old with these defects also be cyanotic? Explain your answer.

Cell, Ask question #Minimum cell theory 100 words accepted#

Ask question #Minimum cell theory 100 words accepted#

What is the bone matrix, Q. What is the bone matrix? What are its main comp...

Q. What is the bone matrix? What are its main components? Bone matrix is the content that fills the intercellular space of the osseous tissue the bone matrix is made of mineral

Explain clinical analysis, Explain Clinical analysis Clinical analysis...

Explain Clinical analysis Clinical analysis:  This analysis includes a complete physical examination and a medical history. The physical examination begins with the patient's

ZOOLOGY, POLYMORPHISM IN COLENTRATAtion..

POLYMORPHISM IN COLENTRATAtion..

Infectious diseases, In f e c tiou s Diseases Infectious diseases ...

In f e c tiou s Diseases Infectious diseases inflicts major economic losses as the disease spreads from one animal to other and large number of animals are affected with t

How are lipids classified, Regarding solubility, how are lipids classified?...

Regarding solubility, how are lipids classified? Fats and oils are hydrophobic molecules, i.e., they are non polar and insoluble in water. Lipids in general are molecules with

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd