Mediaspace scheduled maintenance: Aug 25, 2026 07:00 - 12:00 AM. During this time, videos will be temporarily unavailable. Check status updates.

Lecture

Activated Sludge Process: Treatment and Efficiency

In course

ENV-304: Treatment and valorization of water and waste

Les systèmes eaux et déchets en Suisse: du traitement end-of-pipe à la fermeture des cycles. Principes de l'adduction, de l'évacuation et du traitement des eaux. Bases du dimensionnement des ouvrages, réseaux et stations d'épuration. Gestion, traitement et ...

Description

This lecture covers the activated sludge process for wastewater treatment, focusing on the production of treated water and the biological elimination of impurities. It discusses the mass load, biomass concentration, and elimination efficiency in the activated sludge tank. The lecture also explores factors affecting sludge stabilization, hydraulic residence time, and purification yields. Additionally, it delves into the calculation of hydraulic residence time and the relationship between oxygen demand, sludge production, and wastewater flow rate.

This video is available exclusively on Mediaspace for a restricted audience. Please log in to MediaSpace to access it if you have the necessary permissions.

Watch on Mediaspace

Official source

Ontological neighbourhood

Environmental science

Pollution: Water pollution

Related concepts (17)

Sewage treatment

Sewage treatment (or domestic wastewater treatment, municipal wastewater treatment) is a type of wastewater treatment which aims to remove contaminants from sewage to produce an effluent that is suitable to discharge to the surrounding environment or an intended reuse application, thereby preventing water pollution from raw sewage discharges. Sewage contains wastewater from households and businesses and possibly pre-treated industrial wastewater. There are a high number of sewage treatment processes to choose from.

Activated sludge

The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa. It uses air (or oxygen) and microorganisms to biologically oxidize organic pollutants, producing a waste sludge (or floc) containing the oxidized material. The activated sludge process for removing carbonaceous pollution begins with an aeration tank where air (or oxygen) is injected into the waste water.

Wastewater treatment

Wastewater treatment is a process which removes and eliminates contaminants from wastewater and converts this into an effluent that can be returned to the water cycle. Once returned to the water cycle, the effluent creates an acceptable impact on the environment or is reused for various purposes (called water reclamation). The treatment process takes place in a wastewater treatment plant. There are several kinds of wastewater which are treated at the appropriate type of wastewater treatment plant.

Secondary treatment

Secondary treatment (mostly biological wastewater treatment) is the removal of biodegradable organic matter (in solution or suspension) from sewage or similar kinds of wastewater. The aim is to achieve a certain degree of effluent quality in a sewage treatment plant suitable for the intended disposal or reuse option. A "primary treatment" step often precedes secondary treatment, whereby physical phase separation is used to remove settleable solids.

Sewage sludge

Sewage sludge is the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. The term "septage" also refers to sludge from simple wastewater treatment but is connected to simple on-site sanitation systems, such as septic tanks. When fresh sewage or wastewater enters a primary settling tank, approximately 50% of the suspended solid matter will settle out in an hour and a half.

Related lectures (32)

Water and Wastewater Treatment: Introduction

Covers the basics of water and wastewater treatment, including the history of wastewater treatment, undesirable pollutants, and treatment performance.

Wastewater Treatment: Nutrient Removal

Explores biological nutrient removal and chemical phosphorous removal in wastewater treatment plants, emphasizing denitrification and phosphate removal methods.

Wastewater Treatment I

Explores wastewater treatment principles, BOD removal efficiency, and typical pollutant concentrations.

Biological Nutrient Removal: Nitrogen and Phosphorus

Explores biological nutrient removal in wastewater treatment, covering nitrogen and phosphorus removal, activated sludge process, nitrification, denitrification, and phosphorus recovery.

Wastewater Treatment II