Sedimentation, Biology

1619_sedimentation.png

Simple sedimentation:

The process of removal of suspended, colloidal impurities by allowing water to stand undisturbed in big tanks about 5m deep. Most of the suspended particles settle down at the bottom, due to the force of gravity. The retention period in a sedimentation tank ranges from 2-6 hours.

Sedimentation with coagulation:

Fine suspended particles like mud etc. cannot settle down by plain sedimentation. They are removed by this process in which we add coagulant to water. The coagulant forms an insoluble gelatinous, flocculent precipitate, which traps very fine suspended impurities forming bigger flocks, which further settle down.

Some of the examples of coagulants are alum, ferrous sulphate (FeSO47H2O), sodium aluminate etc.

General reactions during coagulation are:

 

                 AI2(SO4)3+Ca(HCO3)2  1223_food chain.png   2AI(OH)3+3CaSO4+6C02  

                 Coagulant

                 NaAIO2  +  2H21223_food chain.png  AI(OH)3+NaOH (pH =  5.5-8.0)

                  NaOH  +  MgSO4 1223_food chain.png   Mg(OH)2   +  Na2SO4

Posted Date: 7/11/2012 8:39:25 AM | Location : United States







Related Discussions:- Sedimentation, Assignment Help, Ask Question on Sedimentation, Get Answer, Expert's Help, Sedimentation Discussions

Write discussion on Sedimentation
Your posts are moderated
Related Questions
The major air pollutants are: (i)     Carbon monoxide, CO (ii)   Nitrogen oxides, (NO)x (iii) Sulphur oxide, (SO)x (iv) Ground level ozone (O3) (v)   Hydrocarbons (

osmoregulation in non chordates

STRUCTURE OF WATER It may interest you to know that water is a universal solvent and is a major constituent of all living organisms. Earth is the only planet where water exists i

Explain Biochemical Tests Bacterial Testing? It deals with the various biochemical tests used to differentiate microorganisms. Identification of an unknown organism isolated fr

Define Components of Total parenteral nutrition? Glucose: Initiated at the rate of 6 mg/kg/min and increased upto 12-1.4 mg/kg/min, but care to be taken to prevent hyperglyce

how to explain the structure and function of the organelle

Explain the Metabolism - Zinc? Zinc has been found to play an important biological role in our body. Zinc ions can be chelated and precipitated by a number of chelating agents

P l e u r iti s It is the acute or chronic inflammation of the pleural membranes. It is characterized by pain during respiration, pleural effusion, and shallow rapid resp

Describe in detail about the chlorophyll molecule Each chlorophyll molecule contains magnesium ion, there could be no green plants without magnesium. As magnesium is present in

Define Corneal Ulcer - Micronutrient Deficiencies? Corneal xerosis, if not treated promptly, leads to ulceration of the cornea. Initially, the ulcer may be shallow, and if it b