Anaerobic digesters mainly carry out the process in a closed, oxygen-less vessel, that usually occurs in certain natural conditions otherwise. The purpose behind being able to carry out such a process is to reduce the the production of greenhouse gases that may harm the environment and utilizing the biogas produced as a result of this process to produce methane and carbon dioxide, further use them as energy resources.
Anaerobic digesters come in various shapes and sizes that function differently to acquire the same results.
Types of Anaerobic digesters
Following are a few types of anaerobic digesters used for food waste recycling:
1. Complete Mix
Complete mix digester vessels are completely insulated and are maintained at a steady temperature, usually in the mesophilic or thermophilic range. It usually consists of a spherical insulated tank, which is usually placed above or below ground and made from shatterproof concrete, steel or fiberglass. The biogas produced as a result of this could be utilized to run an engine generator and the heat generated from it can be used in water heating or floor heating systems.
2. Covered Lagoon
A covered lagoon digester is a huge anaerobic pond with an extended withholding time period and a high dilution feature. They are typically used to decompose animal dung and manure.
3. Fixed Film
A fixed film digester vessel has a motionless medium that offers a large surface area for microbial expansion. The wastewater is passed through this medium, and as it passes the anaerobic microbes, attach themselves to the material resulting in the creation of a thin microbial film, this is why this kind of digester is known as the fixed film anaerobic digester. These microbes basically help in the removal of the material from the passing wastewater.
Fixed film anaerobic digesters generally consist of small reactor vessels having shorter retention times and are supposed to be filled with waste that will keep floating at all times without clogging.
4. Temperature-Phased Anaerobic Digester (TPAD)
The temperature-phased anaerobic digester comprises of a two stage digester system. It was designed by the Iowa State University. Both the stages are maintained at different temperatures. Temperature phased anaerobic digestion helps in boosting noticeable hydrolysis pace for waste activated sludge.
5. Plug Flow
A plug flow digester vessel is an extended, insulated and heated tank made of toughened concrete, steel or fiberglass fitted with a gas tight cover to capture the biogas that is generated during the digestion process. The plug flow digester works best with a food scrap recycling system. The retention time in a Plug Flow digester is usually 15 to 20 days.
Anaerobic Digesters in Pennsylvania
Energy Recyclers are one of the anaerobic digester companies in Pennsylvania. They have a mission of working for environmental sustainability through food waste recycling and the reduction of landfill to eliminate the production of greenhouse gases as much as possible resulting in a greener, healthier Pennsylvania.Partner with us!