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المحاضرة 2-2

الكلية كلية الهندسة     القسم  الهندسة البيئية     المرحلة 4
أستاذ المادة محمد عبد مسلم عبد الله الطفيلي       04/07/2018 08:22:22
DESIGN PERIOD
The design period (also called the design life ) is not the same as the life expectancy. The design period is the length of time it is estimated that the facility will be able to meet the demand, that is, the design capacity. The life expectancy of a facility or piece of equipment is determined by wear and tear. Typical life expectancies for equipment range from 10 to 20 years. Buildings, other structures, and pipelines are assumed to have a useful life of 50 years or more. Design periods that are commonly employed in practice and commonly experienced life expectancies are shown in Table A-1 .


TABLE A-1
DESIGN PERIODS FOR WASTEWATER WORKS





































FIGURE A-1

SCHEMATIC DIAGRAM OF A WASTEWATER MANAGEMENT INFRASTRUCTURE
SECTION -2
CHARACTERISTICS OF WASTEWATER

Sewage is the wastewater of a community. It may be purely domestic or may contain some industrial or agricultural wastewater. Domestic sewage composed of human body wastes. (faeces and urine) and sullage which is the wastewater resulting from personal washing,, laundry, food preparation and the cleaning of kitchen utensils. Sewage consist of about 99.9% water and 0.1 % solids, the solids are either organic or inorganic. The organic solids consist of about 65% protein, 25% carbohydrate and 10% fats.
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Wastewater quality can be defined by
1. Physical characteristics.
2. Chemical characteristics.
3. Biological characteristics.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .