Activated Sludge: Definition Is defined as a ‘Suspension’ of microorganisms, both living and dead’ in a wastewater. The microorganisms are active by an input of air (oxygen) thus known as activated-sludge. Activate-sludge is that sludge which settle down in a secondary sedimentation...
Biological Wastewater Treatment Method It comprises of the following sub processes: Aerobic biological processes Anaerobic biological processes Facultative biological processes 1. Aerobic Biological Processes Aerobic Biological Processes are those where sufficed amount of dissolved oxygen is required into the wastewater to sustain...
Typical Primary Sedimentation Tank Rectangular Horizontal Flow Tanks These are most commonly used for primary sedimentation, since they Occupy less space than circular tanks. They can be economically built side-by-side with common walls. The maximum forward velocity to avoid the risk of...
Primary treatment is often called clarification sedimentation or setting. This ‘unit operation’ where the wastewater is a allowed to settle for a period (≈2h) in a setting tank and so produce a somewhat clarified liquid effluent in one stream and a liquid-solid...
1. Screening: The first unit operation generally encountered in wastewater treatment plants is screening. A screen is a device with openings, generally of uniform size, that is used to retain solids found in the influent wastewater to the treatment pant. The principal role of...
Objectives of Wastewater Treatment To kill the pathogens To improve the quality of wastewater To avoid unhygienic conditions To protect the aquatic life from the toxicity wastes To make the wastewater usable for agricultural, aquaculture etc There are three constituents and interrelated...
Public Health Engineering The public health engineering sector is responsible for the Collection of water, purification, transmission and distribution of water. A Public Health Engineerr has to perform his job by calculating design flow, design population , design area and population density...
