TABLE OF CONTENTS In microbiology, a small quantity of medium that has solidified in a stoppered incubating bottle tilted so that it is nearly horizontal, which results in a large surface for cultures.
A band screen or drum screen in which the screen is made from slotted metal.
(1) The washing or dropping off of biofilm from an attached growth process (e.g. a rotating biological contactor or trickling filter). (2) The separation and downhill movement of a small portion of slope from the surrounding hillside.
Anaerobic sludge digestion with a retention time of 25 days or more. The digestion tank is heated to about 35 C using the sludge gas, but it may not be mixed. There is no secondary digestion tank. See cold digestion.
A land treatment system where the settled wastewater is applied to the land and percolates down through the soil. This soil must be moderately permeable. The wastewater is treated biologically and filtered as it moves down through the soil. Some of the wastewater may be used by the vegetation. No surface runoff should occur (unlike overland flow land treatment) but any that is collected is then re-applied to the land. The area required is between 10 and 50 ha per 1000 m 3/d of flow. See Figure L.5. Compare rapid infiltration land treatment.
