Working Process of A Sewage Sludge Carbonization Treatment Plant

Have you passes a wastewater treatment plant and wondered how the process works? Most localities have at least one sewage sludge treatment plant. These plants are the places where municipal sewage sludge is treated. This process is divided into three stages. Each stage is designed to further decompose and break down wastewater sludge. Microorganisms are used to help treat the sludge.

Sewage Sludge Carbonization Plant
Sewage Sludge Carbonization Plant

Once digested, the water is removed from the sludge and it is dried. The dried sludge can be used as fertilizer. There are also gases produced during the sludge treatment process and these are used for operating gas engines or as fuel.

Sludge is digested in three stages. The first stage produces a digested sludge which is mostly solid and dry. The second stage produces a supernatant liquor which consists of finely divided and liquefied matter. Stage three produces decomposition gases such as carbon dioxide, methane, and nitrogen. This entire charcoal making process is carried out in sludge digestion tanks.

The three biological action stages that occur during sludge digestion are acidification, liquefaction, and gasification. Each of the stages adds to the complete decomposition and digestion of wastewater sludge.

Acidification begins the wastewater sludge decomposition process. During this stage, bacteria attacks available food sources within the sludge and begins to anaerobically decompose them. This includes soluble nitrogenous compounds and carbohydrates. As the process continues, it produces organic acids and acid carbonates. Gases such as hydrogen sulfide and carbon dioxide are also produced. The production of these acids results in lower pH values.

The next stage is liquefaction. Just like it sounds, the matter is liquefied during this stage. All solid particles are reduced to either a dissolved form. Cellular enzymes stimulate this hydrolysis and there is some fermentation. Ammonia compounds and acid carbonates accumulate and produce hydrogen and carbon dioxide gases. There is a very strong odor and pH values rise. The decomposition gases are trapped by the decomposing sludge. This results in a foam which rises to the surface of the sludge pond. This is a longer stage than the first stage.

Carbonization Machine for Sale
Carbonization Machine for Sale

The final stage of sludge digestion is when the rest of the materials such as organic acids and proteins are broken up. This stage usually produces large amounts of methane gas and smaller amounts of carbon dioxide. The pH value increases again and becomes alkaline. As the sludge continues to decompose, the gas production slows down and the sludge is ready for disposal.

Many sewage sludge carbonization treatment plants 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 process used in this stage may vary among localities. The waste sludge carbobnizer is a good choice.

Treating sewage sludge is a ongoing challenge for most communities. It is important to completely treat all sludge before releasing it for disposal. Biomass charcoal machine from Beston will be a great choice.