What are the advantages and disadvantages of anaerobic digestion?

Table 2 Advantages and disadvantages of the anaerobic digestion process

Advantages Disadvantages
• A carbon neutral energy source is achieved in the form of biogas (Ward et al. 2008) • Complex materials require pre-treatment (Braber 1995)

Is anaerobic digestion bad for the environment?

Methane Emissions Reduction Anaerobic digestion systems capture methane and allow us to use that methane in a beneficial way. Capturing methane is important because methane is a potent greenhouse gas that contributes to climate change if allowed to escape to the atmosphere.

What is the main advantage of anaerobic digestion?

One of the most obvious environmental benefits of anaerobic digestion is its function in reducing greenhouse gas emissions. By capturing methane gas that may have otherwise been lost to the atmosphere, AD operations displace fossil fuel energy use.

Is anaerobic digestion good?

Anaerobic digestion is used as part of the process to treat biodegradable waste and sewage sludge. As part of an integrated waste management system, anaerobic digestion reduces the emission of landfill gas into the atmosphere. Anaerobic digestion is widely used as a source of renewable energy.

Is anaerobic digestion recycling or recovery?

In most cases, the principal purpose of consigning waste to AD is to recover energy from it. This means that in most cases the anaerobic digestion of waste will be classified as ‘other recovery’ for the purposes of the waste hierarchy.

What are the disadvantages of anaerobic digestion?

Anaerobic digestion does have some disadvantages. Anaerobic digestion is not an all in one solution, post-treatment will usually be necessary as BOD is not usually reduced sufficiently for discharge to open water. In particular, nitrogen and phosphorus removal is limited.

How is anaerobic digestion used in bioenergy production?

Anaerobic digestion (AD) is a biochemical process that uses microorganisms to degrade organic materials. AD is a mature technology used for decades as a waste stabilization and/or bioenergy production process. AD transforms organic matter into biogas and a nutrient-rich effluent or “digestate.”

Which is longer lasting organic waste or anaerobic digestion?

The effect of the fertilizer is longer lasting than for untreated organic waste. When carried out at a commercial scale on farms and at wastewater treatment works (WwTWs) it requires a high level of investment in large tanks and other process vessels. If run inefficiently AD can cause an odour nuisance.

What should the temperature be for anaerobic digestion?

Industrial plants usually operate at 20-35 °C although can operate efficiently down to temperatures of 10-15 °C (Mergaert et al, 1992). This problem is usually easily overcome as most wastewaters are released at these temperatures and methane from the digestion process can be used to heat the reactor.