Aerobic Digestion and Anaerobic Digestion

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Watch this video and learn environmental process called Aerobic Digestion and Aerobic Digestion and how can we produce electricity from waste water.

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AEROBIC DIGESTION: (00:00)
is a process in sewage treatment designed to reduce the volume of sewage sludge and make it suitable for subsequent use. More recently technology has been developed that allows the treatment and reduction of other organic waste, such as food, cardboard and horticultural waste. It is a bacterial process occurring in the presence of oxygen. Bacteria rapidly consume organic matter and convert it into carbon dioxide, water and a range of lower molecular weight organic compounds. As there is no new supply of organic material from sewage, the activated sludge biota begin to die and are used as food by saprotrophic bacteria. This stage of the process is known as endogenous respiration and it is process that reduces the solid concentration in the sludge.

ANAEROBIC DIGESTION: (05:08)
Organic waste material (for example food wastes or sewage sludge) is stored in an oxygen free environment (usually a sealed tank or container and commonly referred to as a digester) in the presence of a population of anaerobic micro-organisms.

In this anaerobic environment, biochemical reactions occur that convert organic polymers from the feedstock into methane rich biogas and nutrient rich digestate.

Anaerobic digestion works best at temperatures of 30 – 60°C. Between 30 and 40°C, mesophilic bacteria are the principal micro-organisms present. At 40 – 60°C, thermophilic bacteria are used.

The anaerobic digestion process typically takes anything between 14 and 40 days to complete but this varies upon numerous factors including feedstock type, micro-organism population, temperature and pH

WHAT TAKES PLACE IN THE ANAEROBIC DIGESTER (07:18)
Simply animation about what takes place in the anaerobic digester (Process of anaerobic digestion). How Biogas is processed and used for a variety of energy needs, such as the generation of heat, power and fuel.

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Create: Hrvoje Čočić
Mustaf King II
Category: Education
Music:Supreme
Music provided by Audio Library

Licence: Standard YouTube Licence

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