The organic matter in sewage consists of urea from urine, proteins, carbohydrates, fats and oils and soaps. These are normally composed of a combination of carbon, hydrogen and oxygen, together with nitrogen in some cases. Other important elements, such as sulphur, phosphorus, and iron, may also be present. The organic matter present in sewage is […]
Decomposition of Sewage | Waste Management
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How to Analyse Sewage? | Waste Management
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The principal types of analysis required in the treatment of sewage are: (A) Physical Analysis (B) Chemical Analysis (C) Bacteriological (or Biological) Analysis. (A) Physical Analysis: This includes tests for determining physical characteristics of sewage viz., colour, odour, temperature, turbidity and total solids content. The tests for determining total solids, volatile and fixed as well […]
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Expressing the Demand of Oxygen in Sewage: 4 Ways | Waste Management
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The following points will highlight the four main ways through which the demand of oxygen in sewage is expressed. The ways are: 1. Biochemical Oxygen Demand (BOD) 2. Chemical Oxygen Demand (COD) 3. Total Oxygen Demand (TOD) 4. Theoretical Oxygen Demand (ThOD). Way # 1. Biochemical Oxygen Demand (BOD): Biochemical oxygen demand (BOD) may be […]