Transfer stations are sometimes colocated with material recovery facilities and with localized mechanical biological treatment systems to remove recyclable items from the waste stream.
32.
Biological treatment has been used in Europe to filter surface water for drinking purposes since the early 1900s and is now receiving more interest worldwide.
33.
Also, variable flow of industrial waste associated with production cycles may upset the population dynamics of biological treatment units, such as the activated sludge process.
34.
But Greenspan said, " Especially with young children you are reluctant to use any biological treatment until you've tried behavioral and psychological approaches first ."
35.
The organic wastes are often treated using chemical processes ( e . g . combustion, pyrolysis etc . ) or biological treatment ( microbial decomposition ).
36.
Secondary municipal treatment process produces sewage sludge that is generated by biological treatment processes that include activated sludge systems, trickling filters, and other attached growth systems.
37.
New and emerging waste treatment technologies such as mechanical biological treatment may offer an alternative to kerbside collection through automated separation of waste in recycling factories.
38.
Nevertheless, in many cases research is focused on the extraction of soil and water and its " ex situ " biological treatment to avoid these problems.
39.
The surface biofilm is the layer that provides the effective purification in potable water treatment, the underlying sand providing the support medium for this biological treatment layer.
40.
Some home sewage treatment systems use biological treatment, usually beds of plants and aquaria, that absorb nutrients and bacteria and convert greywater and sewage to clear water.
