Because of growing concerns over global warming and emission of greenhouse gases, a rapid technological advancement was seen in the recycling industry in Pennsylvania.
Organic waste diverted to landfills undergoes anaerobic digestion in an open environment that results in methane emission, which is 80 times more potent than carbon dioxide as a greenhouse gas. Anaerobic digestion gained massive popularity because of its environment friendly and functional nature. Anaerobic digestion effectively utilizes methane in the production of renewable energy.
A range of anaerobic digestion technologies and processes are available today in Pennsylvania, which are being used in converting food waste, livestock waste material and manure, and various other types of organic waste into biogas that is used to generate electricity and heat.
Anaerobic Digestion Processes
There are several different types of anaerobic digestion processes such as single step or multiple step, batch or continuous, and dry or wet digestion.
The Batch Process
In the batch process, the organic material is sealed in the anaerobic digester for 30 to 60 days. The organic material in not mixed during the whole process and as a result it stratifies into layers of gas, stabilized solids, scum, and an active layer. This process has a lower organic loading rate but it requires longer retention times.
The Continuous Process
In the continuous process, the organic material is loaded into the aerobic digester multiple times and an equal amount of digested material is removed. This results in a constant production of biogas. Because of inflow of undigested material and outflow of digested material, organic material inside the digester is somewhat mixed.
Single Stage Anaerobic Digestion
In single stage anaerobic digesters, the operating conditions are optimized to ensure the growth of methanogens, methane-producing bacteria. The most crucial parameter is pH; optimal pH is essential for the production for biogas.
Multiple Stage Anaerobic Digestion
In multiple stage anaerobic digesters, there are two chambers. In the first chamber, the organic material undergoes the breakdown process and then it moves to the second chamber where operating conditions are optimized for biogas production. Multiple stage digesters are complex but they are more efficient also.
Dry Anaerobic Digestion
Dry anaerobic digestion is employed for organic waste containing 25 to 30 percent of dry solid content. Dry organic material digestion requires more efficient pumps to move the dense material but the digesters are comparatively less expensive and smaller as compared to wet anaerobic digesters.
Wet Anaerobic Digestion
This type of anaerobic digestion is suitable for organic waste containing 15 percent or less dry solid content. Wet anaerobic digestion can be carried out with dilute feedstock to promote better mixing.
The growing awareness of problems originated by improper anaerobic digestion of organic material in landfills has stimulated development and research efforts to search for better recycling techniques. Anaerobic digestion is major attraction today for many Recycling companies in Pennsylvania.
If you want to adapt an environment friendly and sustainable waste disposal method, Contact Energy Recyclers today!