Wastewater Secondary Treatment
Secondary treatment happens after primary and is the removal of biodegradable matter from sewage or wastewater. Secondary treatment is given to wastewater after primary treatment to comply with environmental regulations and to provide water that can be discharged into public waterways without causing health hazards, without damage to wildlife and also avoid surface scum issues. Secondary Treatment Secondary treatment includes many processes such as biological nutrient removal (BNR), chemical precipitation, sedimentation, filtration etc. Secondary Treatment Process Secondary treatment processes are classified into biological secondary treatment (such as activated sludge process (ASP) , trickling filter process (TFP)), physico-chemical treatments like oxidation ditches, lagoon treatments etc., whereas tertiary treatments may include microfiltration, ultrafiltration, reverse osmosis etc.
Secondary treatment processes are generally more complicated than primary treatment processes as secondary treatment is designed to separate the sewage sludge from the clean water. Secondary Treatment of Wastewater Secondary treatment of wastewater implies anything after primary wastewater treatments which can include:
Chemical Precipitation
Precipitation with chemicals such as lime or alum salts to settle out a suspended matter.
Filtration
Filtration is a physical process that separates materials of different size, shape, density and/or composition by passing a fluid (such as water) through a medium (such as sand or anthracite). A membrane may also be used.
Sedimentation
Sedimentation is the tendency for particles in suspension to settle out due to their higher density. Secondary Treatment Process Secondary treatment processes are biological which include activated sludge, trickling filter process for removal of organic matter from wastewater. Secondary Treatment of Wastewater Secondary treatment is given to wastewater after primary treatment to comply with environmental regulations and to provide water that can be discharged into public waterways without causing health hazards, without damage to wildlife and also avoid surface scum issues. Make sure to call a sewer line plumber to handle your sewer needs!
