Anaerobic treatment is a biological treatment process in which microbes convert the organic matter in the absence of oxygen. The anaerobic bacteria digest the biodegradable matter present in the wastewater.
Anaerobic wastewater treatment is a wastewater treatment process wherein bacteria are used to break down organic matter. These systems usually include a chamber in which an oxygen-free environment is maintained. The resulting effluent has reduced chemical oxygen demand (COD), biological oxygen demand (BOD), and total suspended solids from wastewater. Anaerobic treatment is used before aerobic treatment so the high concentration of organic material is removed effectively.
The organic matter is converted to biogas, i.e. methane and carbon dioxide. As the bacteria work on the wastewater, biogas is generated which can be used to generate electricity in some situations. Sludge is sometimes used as compost and fertiliser in the agricultural industry. In general, both aerobic and anaerobic treatment methods are used together for the effective removal of contaminants.
It is used to treat wastewater from different industries:
Some types of anaerobic systems include:
Both methods use bacteria to treat wastewater.
In aerobic systems, oxygen is used whereas anaerobic systems do not require oxygen. Different types of bacteria are utilised in each system.
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