PUBLIC HEALTH ENG II COMPLETE NOTES.docx - PUBLIC HEALTH...

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PUBLIC HEALTH ENGINEERING II INTRODUCTION: What is wastewater? Water consumption and disposal cycle: Water source Water treatment Water consumption Waste water generation Wastewater collection Wastewater treatment Effluent disposal (usually by discharge to water bodies – rivers, lakes) TYPES OF WASTES GENERATED IN A TOWN/COMMUNITY – MUNICIPAL WASTES They are: Gases Stormwater Garbage Sullage Sewage 1
Outlines of Sanitary Engineering Waste Products of a Town /City The figure represents the elements of sanitary engineering. Sanitary Engineering starts where Water Supply Engineering ends. PHE II is part of Sanitary engineering. Definition of wastewater: Every community produces gaseous, liquid and solid wastes. The liquid portion is called wastewater and is essentially water supplied to the community after it has been used. It can also be defined as a combination of water carried wastes removed from residences, , institutions, commercial establishments, industrial establishments together with groundwater, surface water and stormwater as may be present. PHE II is concerned with the liquid part of the municipal wastes and is called wastewater. 2
Definition of wastewater engineering: It is a branch of environmental engineering in which the basic principles of science and engineering are applied to solve problems in water-pollution control. The major goal of wastewater management is to protect the environment in a manner commensurate with economic, social and political concerns. Purpose of wastewater treatment and disposal: The purpose of waste water treatment is to preserve the health of the individual and the community by preventing communicable diseases. It also prevents the pollution of the environment – land and water resources. In any inhabited area there is generation of undesired waste especially of excremental nature which should be removed as soon as possible to some place where it cannot affect public health. PHE II – COURSE OUTLINE 1. Introduction to wastewater 2. Sources of Wastewater 3. Quantity of Sewage 4. Wastewater characteristics 5. Elementary microbiology 6. Wastewater treatment and disposal 7. Wastewater collection and conveyance 8. Waste water tests Biochemical Oxygen Demand (BOD) Chemical Oxygen Demand (COD) Total Organic Carbon (TOC) Solids, Bacterialogical Examination Nitrates and Ammonia Tests SOURCES OF SEWAGE: The sources of sewage include: 1) Water supplied to the public for domestic use 2) Water supplied for industrial use 3) Water supplied to institutions like schools, hospitals, hotels etc for various uses 4) Water from wells for domestic use in individual households 5) Water drawn from wells, rivers, lakes, canals for industrial use 6) Infiltration of groundwater into sewers 3
7) Unauthorized entrance of rainwater into sewer lines Factors to be considered in selection of the process of treatment/purification are: 1) Availability of land 2) Proximity to build up area 3) Disposal facilities 4)

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