Have you ever passes a wastewater treatment plant and wondered exactly how the process works? Most localities have a minimum of one sewage sludge carbonization plant. These plants are the places where municipal sewage sludge is treated. This process is split into three stages. Each stage was created to further decompose and disintegrate wastewater sludge. Microorganisms are utilized to help treat the sludge.
Once digested, this type of water is removed in the sludge and is particularly dried. The dried sludge bring fertilizer. In addition there are gases produced in the treatment process which can be used for operating gas engines or as fuel.
Sludge is digested in three stages. The first stage creates a digested sludge which is mostly solid and dry. The second stage makes a supernatant liquor which includes finely divided and liquefied matter. Stage three produces decomposition gases for example fractional co2, methane, and nitrogen. This whole process is done in sludge digestion tanks.
The three biological action stages that occur during sludge digestion are acidification, liquefaction, and gasification. All the stages adds to the complete decomposition and digestion of wastewater sludge.
Acidification begins the wastewater sludge decomposition process. Throughout this stage, bacteria attacks available food sources throughout the sludge and actually starts to anaerobically decompose them. This can include soluble nitrogenous compounds and carbohydrates. Since the process continues, it creates organic acids and acid carbonates. Gases for example hydrogen sulfide and co2 can also be produced. The production of these acids leads to lower pH values.
The following stage is liquefaction. The same as it sounds, the issue is liquefied throughout this stage. All solid particles are reduced to either a dissolved form. Cellular enzymes stimulate this hydrolysis there is a few fermentation. Ammonia compounds and acid carbonates accumulate and provide hydrogen and co2 gases. You will discover a very strong odor and pH values rise. The decomposition gases are trapped from the decomposing sludge. This produces a foam which rises towards the surface of the sludge pond. This is a longer stage compared to first stage.
The ultimate stage of sludge digestion takes place when all of those other materials for example organic acids and proteins are separated. This stage usually produces a lot of methane gas and smaller levels of co2. The pH value increases again and becomes alkaline. As the sludge continues to decompose, the gas production slows and also the sludge is ready for disposal.
Many sewage sludge treatment plant have another stage of sludge decomposition. This stage occurs before disinfection and is called advanced or tertiary treatment. This stage involves ion exchange, sand filtration, activated carbon filters, coagulation-flocculation, membrane processing, fine screening or nitrification-denitrification. The method employed in this stage could differ among localities.
Treating wastewater is a ongoing challenge for many communities. You should completely treat all sludge before releasing it for disposal.