Aeration provides oxygen to the helpful bacteria and other organisms as they decompose organic substances in the wastewater.Ī time-honored example of an aerobic biological treatment method is the activated sludge process, which is widely used for the secondary treatment of both domestic and industrial wastewater. ![]() Diffused aeration systems may be used to maximize oxygen transfer and minimize odors as the wastewater is treated. Constructed wetlands and various types of filtration are also considered biological treatment processes. Aerobic Wastewater TreatmentĪerobic wastewater treatment processes include simple septic or aerobic tanks, and oxidation ditches surface and spray aeration activated sludge oxidation ditches, trickling filters pond and lagoon-based treatments and aerobic digestion. In the primary water treatment process, sediments and substances such as oil are removed from the wastewater. Scientists have been able to control and refine both aerobic and anaerobic biological processes to achieve the optimal removal of organic substances from wastewater.īiological wastewater treatment often is used as a secondary treatment process to remove material remaining after primary treatment with processes including dissolved air flotation (DAF). “Aerobic” refers to a process in which oxygen is present, while “anaerobic” describes a biological process in which oxygen is absent. Biological treatment is used worldwide because it’s effective and more economical than many mechanical or chemical processes.īiological treatment usually is divided into aerobic and anaerobic processes. The goal of biological wastewater treatment is to create a system in which the results of decomposition are easily collected for proper disposal. It also may contain pathogenic organisms, heavy metals, and toxins. ![]() Wastewater typically contains a buffet of organic matter, such as garbage, wastes, and partially digested foods. Biological wastewater treatment harnesses the action of bacteria and other microorganisms to clean waterīiological wastewater treatment is a process that seems simple on the surface since it uses natural processes to help with the decomposition of organic substances, but in fact, it’s a complex, not completely understood process at the intersection of biology and biochemistry.īiological treatments rely on bacteria, nematodes, or other small organisms to break down organic wastes using normal cellular processes. Biological wastewater treatment - which relies on microorganisms to break down organic waste - has a long history, and ranges from simple cesspits to conventional activated sludge plants all the way to technologically advanced solutions like MABR.
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