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
Alkaline Phosphatases use water as a second substrate. Why do we still treat their kinetics as if they were for a single-substrate reaction?

The holoenzyme is denatured by heat at very high temperature. It is found that two polypeptides, although denatured, contains chains that remain together as a unit, while two other

Advise on Rest, recreation, sleep The patient should take enough rest and get good sleep. Restrict the visitors so that the patient can get enough rest. Not to strain th

Making smoke prints of leaves Smoke prints of leaves may be simply made by following the four steps shown in the diagrams. Cover the side of a smooth, round bottle with a thin l

What does acute disease mean? An sharp disease is which does not last for a longer duration n has no weakness in the body

Plant Water Role of Water in Plants You know that water is the main constituent of plant cells. It performs the following major functions Water as a Solvent Water is a v

Artificial Parthenogenesis In various cases, the eggs that normally develop only after fertilisation can be experimentally induced to develop parthenogenetically by specific

heterotrophic mode nutrition plants

Q. Dietary Fibre requirement during diabetes? Dietary fibre is that part of food which is not digested by the intestines. High fibre meals have shown to give the best glycemic

State the term - Neuropsychological Examination For a neuropsychological examination a battery of tests administered should include, at a minimum: Intelligence Tests