Biological filters

Fig. 7. A bead filter, one of many types of biological filters, shown in association with a laboratory-scale recirculating water system. Small plastic beads inside the fiber glass chamber provide surface area for colonisation by bacteria that convert ammonia to nitrate.

Fig. 13.2. Liquid gas mass transfer process in biological filter, attached growth system.

WWTP2 Tudela 90,000 833 Ebro Urban 18 Primary settling Biologic filters... 

Bifilm A sewage treatment process utilizing two aerated biological filters filled with granular plastic media. Developed by Biwater, UK, and piloted in 1994. 

Personal Protection Protective clothing must be used as well as protection for the respiratory tract by using a mask with biological filters or self-contained breathing apparatus (SCBA) with positive pressure, at least until you know the specific threat(s). Also, Time/Distance/Shielding. 

Fig. 2. Recirculating, rack-type zebrafish system. A system made by Aquaneering, Inc., that provides multi-phase filtration, including a biological filter, and the ability to use tanks ot various sizes on the same system. The light-tight boxes shown on two rows ot the system here are an optional feature that allows for independent control of the light cycle tor each ot the enclosed rows. (Photograph and copyright permission kindly provided by Aquaneering, Inc.).

Oxidation of organic matter in waste-waters with Pd catalyst or fixed micro-organisms (biological filters). ... 

The significant change is represented by a quick and inexpensive biological filter to rapidly discard nonactive molecules and to focus further efforts on a few confirmed and attractive positives. The assay, thus, is automated to test even hundreds of thousands of compounds in a relatively short time, and this introduces some limitations. The following are among the most relevant ... 

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