Environmental engineering is defined as the branch of engineering that is concerned with protecting the environment from the potentially deleterious effects of human activity, protecting human population from the effects of adverse environmental factors and improving environmental quality for human health and well-being.
The Environment * Global * Consists of the atmosphere, the hydrosphere and the lithosphere * Local * Constrained
Life sustaining resources are withdrawn from the biosphere and wastes are discharged into the biosphere. Waste discharge degrades the local environment and natural systems restore the degraded quality. When pollution load exceeds the assimilative capacity of biosphere, it shows the signs of stress.
The Impact of Humans upon Environment
Human population have thrived and flourished beyond natural constraints. Wastes generated by these increased number of human beings have upset the natural equilibrium.
Natural needs * Needs human share in common with most of the higher mammals.
Acquired needs * Needs associated with more advanced civilizations.
Satisfying Natural Needs * Natural needs are met by unprocessed resources and the wastes generated are generally compatible with, or readily assimilated by the environment. * Early civilization produced little pollution load and natural cleansing mechanisms easily restored the quality of the local environment. * Only as early peoples began to gather together in larger groupings did their impact upon their local environments begin to be significant. * Air pollution in 61 A.D. * Water pollution by the late eighteenth century in the river Rhine and Thames. * Solid waste problem from the middle ages.
Satisfying Acquired Needs * Industrial revolution enabled human to satisfy their natural needs easily. * Increasingly they turned their attention to other needs beyond those associated with survival. *