HSSF CWs require good mechanical pretreatment with suspended solids being the major target. Excessive suspended solids may cause filtration-bed clogging and subsequent surface flow. Small systems for domestic sewage with low flows usually use a three-chamber septic tank. Pretreatment in systems designed for municipal sewage mostly comprise screens and Imhoff tank. When stormwater runoff is also treated (combined sewer system), a grit chamber is included (Figures 3 and 4). If wastewater contains oils and/or grease, the grease filter should be a part of the pretreatment. Various types of wastewater may require different types of pretreatment; for example, landfill leachate treatment systems usually include aerated lagoons, systems for the treatment of concentrated wastewaters from agricultural operations commonly include facultative lagoons.
Was this article helpful?
Learning About 10 Ways Fight Off Cancer Can Have Amazing Benefits For Your Life The Best Tips On How To Keep This Killer At Bay Discovering that you or a loved one has cancer can be utterly terrifying. All the same, once you comprehend the causes of cancer and learn how to reverse those causes, you or your loved one may have more than a fighting chance of beating out cancer.