Things to consider
When selecting an in-vessel composting system, there are several important criteria that you should consider:
Volume: The first step is to determine the amount of organic waste you want to process. This will help you determine the size of the composting system that you need. Have you done a waste audit to determine how much organic matter you are producing? For carbon credit applications documentation of the last 2 years waste generation volumes is required. Consider seasonality or periodicity as well: does the amount of organic matter to be recovered differ over time?
Type of organic waste: Different types of organic waste have different composting requirements, so it’s important to understand the composition of your waste stream before selecting a composting system. Processing times for heavy protein content waste will differ to light vegetative matter.
Partners: are there other potential users of the system close by to your premises that can benefit from it’s use. This can help defray costs and improve the quality of your compost outputs.
Footprint: Consider the space available for the composting system, accessibility for waste delivery and removal.
Cost: The cost of an in-vessel composting system can vary widely, so it’s important to compare costs and find a system that fits your budget. Can you depreciate the asset on an advanced schedule?
Compliance with regulations: Make sure the composting system meets local, state, and federal regulations, including those related to compost quality, leachate management, and odour control.
User-friendliness: Consider the ease of operation, monitoring, and maintenance of the composting system. Can you vary outputs by cycle.
Emissions: does the system under consideration negate methane emissions? Is there any smell associated with the system you are considering? Your supplier may be able to provide gas spectrometry reports.
- End use: to what use will you put the resultant compost? Some users prefer a very dry pelletised output whilst others prefer an almost moist output suitable for mulching. The Australian standard for compost is AS4544.
By considering these criteria, you can select an in-vessel composting system that meets your needs and provides efficient, high-quality composting.