# activated sludge

> processing sludge

**Wikidata**: [Q815353](https://www.wikidata.org/wiki/Q815353)  
**Source**: https://4ort.xyz/entity/activated-sludge


## References

1. Freebase Data Dumps. 2013
2. Environment Ontology
3. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)