Effluent Recycling Pump

FIG. 7.35.9 Schematic diagram of two fluidized-bed reactors in series for biological wastewater treatment. (Reprinted, with permission, from E.T. Oppelt and J.M. Smith, 1981, U.S. Environmental Protection Agency research and current thinking on fluidised-bed biological treatment, in Biological fluidised bed treatment of water and waste water, edited by P.F. Cooper and B. Atkinson, Chichester Ellis Horwood Ltd., Publishers.) to 4.8 kg m3 day for a standard oxygen-activated sludge process. The...

Material Life Extension

Recycling is the reformation or reprocessing of a recovered material. The EPA defines recycling as the series of activities, including collection, separation, and processing, by which products or other materials are recovered from or otherwise diverted from the solid waste stream for use in the form of raw materials in the manufacture of new products other than fuel (U.S. EPA 1991a). Recycled material can follow two major pathways closed loop and open loop. In closed-loop systems, recovered...

Separation at the Source

Kitchen designers and suppliers of kitchen equipment will need to become more sensitive to the needs of recycling. Major manufacturers of kitchen equipment should make sorting drawers, lazy Susan sorting bins, and tilt-out bins as standard kitchen equipment. Kitchen designers should keep in mind small convenience items, such as automatic label scrapers, trash chutes, and can flatteners to make recycling more convenient. The more finely household waste is separated, the greater its contribution...

Recycling Waste Streams Directly

If waste streams can be recycled directly, this way is clearly the simplest to reduce waste and should be considered first. Most often, the waste streams that can be recycled directly are aqueous streams which, although contaminated, can be substituted for part of the freshwater feed to the process. Figure 3.8.2 is a flowsheet for the production of iso-propyl alcohol by the direct hydration of propylene. Propylene containing propane as an impurity is reacted with water to give a mixture which...