Environmental Engineering - II Premium Lecture Notes (All 5 Units) Prepared by Bala. Specially for Civil Engineering. Syllabus Covered based on Anna University B.E Civil Engineering.
CHAPTER:
UNIT-1 INTRODUCTION (pg.no 1-26)
UNIT-2 SEWER DESIGN (pg.no 1-44)
UNIT-3 SEWAGE TREATMENT UNIT PROCESS AND FUNCTIONS (Pg.no 24)
UNIT-4 SECONDARY TREATMENT OF SEWAGE(Pg.no 34)
UNIT-5 DISPOSAL OF SEWAGE AND SLUDGE (Pg.no 36)
Attachment: Click hereUNIT-1
INTRODUCTION
Details of sources for waste generation
Problems
Waste water characteristics
Effects of sewage waste water
Waste water constitute
Effluent standards in India
Legislation and rights of the people
Environment
Health care food , water and social security
Sludge uses
Environmental act enacted by central government
1. Water act 1974
2. Air act 1981
3. Atomic energy act 1982
4. Motor vehicle act 1988
5. Forest and wildlife act 1972
UNIT-2
SEWER DESIGN
Sewerage system
Sewage system
Advantage of separate sewage system
Disadvantage
Illustration of separate sewer system
Design of sludge digestion tank
Combained sewerage system
Hydraulic for sewer
Sanitary sewer
Average flow
Peak flow
Minimum flow
Selection of dia of pipe
Determination of the storm sewers
Area of the basin
Time of concentration
Design of air ejector
Small boar system
Laying of sewers
1. Marking lines of sewers
2. Excavation of trenches
3. Checking the gradient
4. Preparation of bedding
5. Laying of sewers
6. Jointing of pipes
7. Back filling
Testing of sewers
1. Water test
2. Air test
One pipe system
Single stack system
Ventilation
Anti siphonage pipe
Interceptors
Pumps for sewage pumping
Submersible pumps
Self priming centrifugal pump
Computer application
UNIT-3
SEWAGE TREATMENT UNIT PROCESS AND FUNCTIONS
Grey water
Selection of treatment process
Primary treatment process
Secondary treatment process
Tertiary treatment process
On-site sanitation
Septic tank
Aline diagram
Imhoff tank
Advantages
Disadvantages
Sewage treatment – screen – various types parameters
Design consideration
Problems
UNIT-4
SECONDARY TREATMENT OF SEWAGE
Objectives
Secondary stage
Filtration
Types
1. Contact beds
2. Intermittent sand filter
3. Tricking filters
Construction and operation
Merits and demerits
Waste stabilization ponds
Application and suitability
Uses
Mechanism of purification
Classification of stabilization pond
1. Aerobic pond
2. Anerobic pond
3. Facultative pond
Factors affecting the pond reactions
Oxidation ditch
Advantages
Disadvantages
Operation of OD
BOD removal
Recent advances in waste treatment
Logical nutrient removal
Chemical oxidation
Membrane technology
Typical process in STP
Design approach
Sewage reuse
Reason for waste water reuse
Types of reuse
Urban agriculture
UNIT-5
DISPOSAL OF SEWAGE AND SLUDGE
Activated sludge process design
Purification of natural water bodies
Oxygen slag analysis
Sludge dewatering
Sludge drying
Sludge conditioning
Advantage in sludge treatment and disposal
Solar drying bed
Biogas recovery
Biogas from waste to energy
Thickening
Deep well injection
Sewage forming
Purpose of sewage farm
Soil dispersion
Micro – straining
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