Activated sludge definition

Activated sludge means a biological wastewater treatment process in which a mixture of wastewater and sludge floc, produced in a raw or settled wastewater by the growth of microorganisms, is agitated and aerated in the presence of a sufficient concentration of dissolved oxygen, followed by sedimentation.
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Activated sludge means sludge floc produced in raw or settled wastewater by the growth of zoogleal bacteria and other organisms in the presence of dissolved oxygen and accumulated in sufficient concentration by returning floc previously formed;
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Activated sludge means a biological wastewater treatment process in which biodegradable pollutants in wastewater are absorbed, or adsorbed, by living aerobic organisms and bacteria in an aerated suspension that is separated from the treated wastewater.
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Examples of Activated sludge in a sentence

  • EC₅₀, 96 hours: 18260 mg/l, Daphnia magna REACH dossier information.EC₅₀, 96 hours: ~ 22000 mg/l, Pseudokirchneriella subcapitata REACH dossier information.IC₅₀, 3 hours: >1000 mg/l, Activated sludge REACH dossier information.Persistence and degradability There are no data on the degradability of this product.

  • Substance did not cause acute toxicity to the freshwater invertebrates EC₅₀, 48 hours: >1000 mg/l, Daphnia magnaEC₅₀, > 72 hours: 1000 mg/l, Freshwater algaeSubstance did not cause acute toxicity to the freshwater green algae EC₅₀, >: 100 mg/l, Activated sludge NOEC, 28 days: 0.131 mg/l, Oncorhynchus mykiss (Rainbow trout) NOEC, 28 days: 0.23 mg/l, Daphnia magnaPersistence and degradability There are no data on the degradability of this product.

  • Activated sludge showed a very low sensitivity to sodium sulfate.

  • Basic of microbiology Biological : Wastewater treatment systems : BDO, Kinetics, Kinetics and Design of Aerobic Processes- Activated sludge process and its modifications.

  • Substance did not cause acute toxicity to the freshwater invertebrates EC₅₀, 48 hours: >1000 mg/l, Daphnia magnaEC₅₀, > 72 hours: 1000 mg/l, Freshwater algaeSubstance did not cause acute toxicity to the freshwater green algae EC₅₀, >: 100 mg/l, Activated sludge NOEC, 28 days: 0.131 mg/l, Oncorhynchus mykiss (Rainbow trout) NOEC, 28 days: 0.23 mg/l, Daphnia magnaPersistence and degradability No data available.

  • EC₅₀, 96 hours: 18260 mg/l, Daphnia magna REACH dossier information.EC₅₀, 96 hours: ~ 22000 mg/l, Pseudokirchneriella subcapitata REACH dossier information.IC₅₀, 3 hours: >1000 mg/l, Activated sludge REACH dossier information.

  • Trimethylolpropane Biodegradation Activated sludge - Degradation 100%: 28 days 12.3. Bioaccumulative potentialBioaccumulative potential No data available on bioaccumulation.Partition coefficient Not available.

  • NOEC, 48 hours: pH 5.5 , Daphnia magna EC₅₀, 48 hours: pH 4.92 , Daphnia magna REACH dossier information.EC₅₀, 72 hours: pH 4.7 , Chlorella vulgaris REACH dossier information.EC₅₀, 3 hours: pH 5 - 5.5 , Activated sludge REACH dossier information.Persistence and degradability There are no data on the degradability of this product.

  • LC₅₀, 48 hour: 2.4 mg/l, Daphnia magna ErC50, 72 hour: 1.38 mg/l, skeletonema costatum EC₅₀, 0.5 hour: 466 mg/l, Activated sludge NOEC, 21 day: 0.63 mg/l, Daphnia magnaPersistence and degradability The product contains inorganic substances which are not biodegradable.

  • Substance did not cause acute toxicity to the freshwater invertebrates EC₅₀, 48 hours: >1000 mg/l, Daphnia magnaEC₅₀, > 72 hours: 1000 mg/l, Freshwater algaeSubstance did not cause acute toxicity to the freshwater green algae EC₅₀, >: 100 mg/l, Activated sludge NOEC, 28 days: 0.131 mg/l, Oncorhynchus mykiss (Rainbow trout) NOEC, 28 days: 0.23 mg/l, Daphnia magnaPersistence and degradability The product is not expected to be biodegradable.


More Definitions of Activated sludge

Activated sludge means a biological sewage treatment process in which a mixture of sewage and sludge floc, produced in a raw or settled sewage by the growth of zoogloea and other organisms, is agitated and aerated in the presence of a sufficient concentration of dissolved oxygen, followed by sed- imentation. This definition includes but is not limited to: conventional activated sludge, extended aeration, step aeration, contact stabilization, Kraus process, Hatfield process, complete mix, high-rate aeration and oxidation ditches.
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Activated sludge means the suspended biomass containing living microbial organisms used in the Aeration Basin to degrade and remove dissolved organics from the wastewater.
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Activated sludge means a biological wastewater treatment process in which a mixture of wastewater and activated sludge is agitated and aerated and includes extended aeration and oxidation ditch treatment processes.
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Related to Activated sludge

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  • Sewage sludge means a solid, semi-solid, or liquid residue generated during the treatment of domestic sewage in a treatment works as defined in section 6111.01 of the Revised Code. "Sewage sludge" includes, but is not limited to, scum or solids removed in primary, secondary, or advanced wastewater treatment processes. "Sewage sludge" does not include ash generated during the firing of sewage sludge in a sewage sludge incinerator, grit and screenings generated during preliminary treatment of domestic sewage in a treatment works, animal manure, residue generated during treatment of animal manure, or domestic septage.

  • Sewage sludge weight means the weight of sewage sludge, in dry U.S. tons, including admixtures such as liming materials or bulking agents. Monitoring frequencies for sewage sludge parameters are based on the reported sludge weight generated in a calendar year (use the most recent calendar year data when the NPDES permit is up for renewal).

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  • Sludge dryer means any enclosed thermal treatment device that is used to dehydrate sludge and that has a maximum total thermal input, excluding the heating value of the sludge itself, of 2,500 Btu/lb of sludge treated on a wet-weight basis.

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