Aerobic vs. Anaerobic

Why anaerobic

Anaerobic digestion processes occur in many places where organic material but no oxygen is available. The process can be found in ditches, municipal sewers, sediments of lakes or stomachs of cows. Anaerobic digestion is the fermentation process in which biogas is produced by degradation of organic material. This biogas consists mainly of methane (60-90%) and carbon dioxide (10-40%). The produced biogas is a useful form of energy which can be utilized in, for example, a steam boiler or a gas engine.

Aerobic vs Anaerobic Econvert

Anaerobic wastewater treatment is a very effective way of removing biodegradable organic compounds (COD/BOD). Most of the mineralised compounds like NH4+, PO4 3- S2- will be left in the solution (some of it will be needed for bacterial growth). Anaerobic wastewater treatment can be applied at any scale and at almost any place. A huge up-side of the process is that the amount of excess sludge produced is very small and that this sludge (anaerobic granules) even has a market value. Whereas aerobic systems, uses approximately 1 kWh of aeration energy per kg of COD and yields about 50% new sludge from the COD converted, an anaerobic system doesn't require aeration at all and only yields about 3-4% new sludge from the COD converted. Not surprisingly, anaerobic wastewater treatment is in many cases the best wastewater treatment technology.

Anaerobic wastewater treatment has the following striking advantages:

90% less sludge production compared to aerobic treatment; Excess sludge has a market value; Production of about 11 MJ of energy per kg COD removed. High volumetric loading rates possible, resulting in a (small footprint); Saving of about 1 kWh/kg COD removed; Quick start-up; Good possibilities for water reuse in factories (towards closed loops); Very little consumption of chemicals; Applicable in a wide range of COD concentrations from 1000 mg/l up to 200000 mg/l; Economically interesting at COD loads starting from 500 kg per day.

Anaerobic treatment is amongst others applicable in the following markets:

Pulp and Paper Food and Beverage Flavours and Fragrances Chemical and Pharmaceutical

Curious whether anaerobic wastewater treatment could be the best solution for your process? Contact us!