Dr.

Susmita Das
Assistant Professor
Ph.D. in Environmental Engineering, Yonsei University, South Korea
B.Sc. in Civil Engineering, Ahsanullah University of Science and Technology

Phone: 01767282506
Email : susmita.ce@aust.edu

Room No: #13

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CE 331: Environmental Engineering I

Introduction to the Course

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CE 331 Course Outline

Water Supply Engineering: introduction; water demands; water supply sources; ground
water exploration: aquifer properties and ground water flow, well hydraulics, water well
design, drilling, construction and maintenance; water demand for rural communities;
shallow hand tube wells and deep set Tara pumps for problem areas.

Surface water collection and transportation; had works; pumps and pumping machineries;
water distribution system; analysis and design of distribution network; fire hydrants; water
meters; leak detection; unaccounted for water.

Water quality requirements; water treatment-plain sedimentation, flocculation and

settlement, filtration, disinfection, miscellaneous treatment methods; low cost treatment
methods for rural communities.

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References Books

 Peavy, H.S., Rowe, D.R. and Tchonanoglous, G. Environmental Engineering, McGraw-Hill

Publishing
 Introduction to Environmental Engineering – Davis and Cornwell. (5th edition). McGraw-Hill
Publishing
 Water Supply Engineering by M. A. Aziz
 Water Supply & Sanitation: Rural and Low Income Urban Communities by M. Feroze Ahmed
and Md. Mujibur Rahman
 CE 332: Environmental Engineering Sessional Class notes, AUST.

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 Structural Geotechnical Transportation Water Resources Environmental
Engineering Engineering Engineering Engineering Engineering

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Environmental Engineering
A branch of engineering that focuses on the application of science and engineering principles to improve
and protect the environment.

“Environmental Engineering is manifest by sound

engineering thought and practice in the solution
of problems of environmental sanitation, notably
in the provision of safe, palatable, and ample
public water supplies; the proper disposal of or
recycle of wastewater and solid wastes; the
adequate drainage of urban and rural areas for
proper sanitation; and the control of water, soil
and atmospheric (air) pollution, and the social
and environmental impact of these solutions.”

Design, implement, and manage systems that can protect and improve the environment, while also
ensuring that these systems are cost-effective and sustainable over time.
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Environmental Engineering: Definition

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Sustainable Development Goals (SDGs)

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What to expect from this course?

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Water Sources: Global View

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Provision for Safe Water Supply
Coagulants:
Aluminum sulfate (alum),
Ferric chloride,
Polyaluminum chloride
(PAC)

Disinfactants:
Chlorine, ozone, ultraviolet (UV)
radiation, and hydrogen
peroxide.
filtration or chemical oxidation
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Provision for Safe Water Supply

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Provision for Safe Water Supply

calcium and magnesium

Activated carbon, sediment, or ceramic

Commonly used to remove sediment, chlorine, and other chemicals

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Provision for Wastewater Treatment

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Removal processes in conventional WWTP

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What is the Role of an Environmental Engineer

Adapt the principles of natural mechanisms to engineered systems;

engineered processes are designed to amplify and optimize the
operations observed in nature.

Use all available technical tools to design efficient treatment devices

that are modelled after natural processes.

Requires understanding of biological/ chemical reactions and

physical processes involved in natural and engineered systems

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History of Water Treatment and Supply

In the Egypt of the Pharaohs it was left

standing water in clay pots for several
months to allow precipitate particles
and impurities, and through a siphon
drew water from the top (decanting), at
other times incorporating certain
minerals and vegetables to facilitate
precipitation of particles and clarify the
water (coagulation).

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History of Water Treatment and Supply
Evidence of water boiling and filtering dates back to 2000 B.C. (sanskrit
literature), siphoning and filtering to 1300 B.C. (Egyptian drawings, Greek
and Roman literature)

Roman aqueducts had settling basins at headworks (first century) which

supplied water to private wells and fountains or reservoirs for general
public use.

Rainwater harvesting and sand filtering in Venice (fifth century)

Filtering devices were used in private households, institutions, ships in the

18th Century France and England
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Roman Aqueducts and Venetian water tank

underground storage
tanks used to collect
and store rainwater
in Venice

using gravity flow, which allowed water to flow downhill from the source to the city. 21
History of Water Treatment and Supply

19th Century: public water was treated in a large scale. The city of Paisley,
Scotland is credited as the first city to have a treated water supply (Settling
operations + filtering)

Development of hydraulically cleaned Rapid Sand Filter during the latter part of
the 19th Century in America

Motivation of filtration was to improve the aesthetic quality of water

Disinfection practice emerged after the acceptance of germ theory of disease.
(Belgium in 1902, Philadelphia in 1913)

Treatment processes developed in the absence of scientific knowledge

concerning the basic principles of water treatment.

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Thank you

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Extra

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