Explaining the Activated Sludge Process（解释了活性污泥过程）.pdfVIP

Spring 2003 Vol. 14, No. 2 Small Community Wastewater Issues Explained to the Public Explaining the Activated Sludge Process t is to everyone’s advan- tank, leaving a relatively clear liquid The resulting settled solids, the acti- tage for a community to free of organic material and suspend- vated sludge, are returned to the first I be able to treat its ed solids. tank to begin the process again. wastewater in the most Described simply, screened waste- Initially developed in England in the economical way. The activated water is mixed with varying amounts early 1900s, the activated sludge sludge process has the advantage of of recycled liquid containing a high process did not become widespread producing a high quality effluent for proportion of organisms taken from a in the U.S. until the 1940s. Today a a reasonable operating and mainte- secondary clarifying tank, and it number of variations of the basic nance costs. becomes a product called mixed process have been developed. This The activated sludge process uses liquor. This mixture is stirred and issue of Pipeline includes descrip- microorganisms to feed on organic injected with large quantities o