The phrase "active sludge" is correct and usable in written English.
It is typically used in the context of wastewater treatment to refer to the biomass that is involved in the biological treatment process.
Example: "The treatment plant relies on active sludge to effectively break down organic matter in the wastewater."
Alternatives: "biological sludge" or "activated sludge".
The strain was isolated from an active sludge sample based on indigo-forming capacity.
Fresh active sludge was obtained from a municipal STP to inoculate the model STP units.
In Tunisia, wastewater is treated by using active sludge and ponds (Saied and Koundi [1990]).
A continuous system electrocoagulation – active sludge was designed and built for the treatment of industrial wastewater.
Purification test using the porous ceramics (750 g) was successfully achieved in artificial waste water (15 L) containing 100 mL of milk and 15 mL of active sludge.
These results proved that the active sludge with proliferating microbes in the pores of porous ceramics played a principal role in these waste water purification tests.
The impact of prolonged exposure to activated sludge on the polyamide active layer of TFC FO membranes was even more severe.
Oseltamivir carboxylate (OC), Tamiflu's active metabolite, is known to withstand activated sludge treatment at sewage treatment plants (STPs), but less is known about how much OC may make its way into waterways that receive STP effluent.
Under such oxygenated conditions, microorganisms thrive, forming an active, healthy suspension of biological solids mostly bacteria called activated sludge.
In this study, comparative metagenomics coupled with metabolic network analysis was carried out to study the inter-species cooperation and competition among carbohydrate-active microbes in typical units of wastewater treatment process including activated sludge and anaerobic digestion.
In one study turbid wastewater contaminated with S. natans showed reduced sludge volume and clearer supernatant after 12 hours; in addition, the phages remained stable and active for more than 9 months and tolerated temperature and pH fluctuations common to activated sludge processes.
