In this slide we know about aeration method and coagulation process. Which is used in Drinking water Treatment Plant. In Aeration process oxygen got dissolved with natural phenomena and presence of sun ray. By help of this method the minor and major type of bacteria automatically cleaned. this method have different types:- 1) Stepped Aeration 2) Fountain Aeration. second one is the Coagulation Process. In the water various types of small partials are present which can not be possible to see from naked eyes. So that we use this process and settle down all the partical by adding coagulation agent like alum.

1. Drinking Water Treatment Process
Aeration Method
PRESENTED BY:-
DEEPANJALI SAHU
ASISTANT PROFESSOR

2. WATER AERATION

3. CONTENTS
 Water quality
 Aeration methods
i. Natural aeration
ii. Surface aeration
 Fountains
 Floating surface aerators
 Paddlewheel aerators
i. Subsurface aeration
 Oxygenation barges

4. Water quality
 Water aeration is often required in water bodies that
suffer from anoxic conditions, usually caused by
adjacent human activities such as sewage discharges,
agricultural run-off, or over-baiting a fishing lake.
 Dissolved oxygen (DO) is a major contributor to water
quality.

5. Aeration methods
 Any procedure by which oxygen is added to water can be
considered a type of water aeration.
 There are two categories of pond aeration:- surface
aeration and subsurface aeration.

6. Cont…
Natural aeration:- Natural aeration is a type of
both sub-surface and surface aeration. It can occur
through sub-surface aquatic plants.
 Surface aeration:-

7. Fountains
 Fountains aerate by pulling water from the surface of the
water (usually the first 1–2 feet) and propelling it into the
air.
 A fountain consists of a motor that powers a rotating
impeller.
 This process utilizes air-water contact to transfer oxygen.

8. Floating surface aerators
 It is often difficult for this type of machine to aerate the
entire water column.

9. Paddlewheel aerators
 Paddlewheel aerators also utilize air-to-water contact to
transfer oxygen from the air in the atmosphere to the pond.
 Subsurface aeration:- Subsurface aeration seeks
to release bubbles at the bottom of the pond and allow them
to rise by the force of gravity.

10. Oxygenation barges
 The barge is capable of dissolving up to 5 tonnes of
oxygen in 24 hours.
 The Problem Development
within watersheds has
increased greatly
in recent years.

11. Benefits
 Increased dissolved oxygen
 Reduced algal growth
 Improved water quality
 Reduced weed growth

12. Alum dosing
• After aeration the alum dosing is required on the
water for use of flocculation of small particles which
present on the water.

13. Thank you……...