How to Empty Compost Toilet

Emptying a compost toilet might initially seem like a daunting and unpleasant task, but it isn’t necessarily so. Much depends on the specific type of composting toilet you have, as there are many different models and systems available. From self-contained units to central composting systems, each has its own method for handling waste and its subsequent removal. This diversity means that the process can be much simpler and more sanitary than one might imagine, especially with modern advancements in compost toilet design.

In this article, we will explore the processes involved in maintaining and emptying different types of composting toilets, beginning with those of smaller capacity. These compact units are common in personal or low-use settings, and their maintenance routines are straightforward yet crucial for optimal operation. Next, we’ll delve into batch composting toilets, which involve segregating waste into different compartments for decomposition. Finally, we’ll examine continuous composting toilets, where waste is continuously added and decomposed, requiring a unique approach to emptying and maintenance. By understanding these systems, users can manage their compost toilets efficiently and hygienically.

How to Empty a Compost Toilet of Small Size

When it comes to small-sized waterless toilets, all contents are typically contained within a self-contained unit. Accessing these contents usually involves removing a lid on top of the toilet to reach the inner containers. The design of the toilet determines the number of containers inside: urine-diverting dry toilets often feature two separate containers—one for solids and another for urine—while some other compost toilets have a single bin. For urine-diverting toilets, each container is accessed and emptied separately. In the case of a single-bin system, the bin is removed from the toilet and taken to a designated emptying site, typically an outdoor compost area designed to accommodate larger volumes of compostable waste.

RV-Pod is an example of a small-size dry toilet that separates urine already in the seat into two distinct compartments. The correct term for this type of a toilet is a urine-diverting collection toilet.

How Batch Composting Toilets are emptied

Batch composting toilets utilize two or more composting containers. At any given time, one container is actively used for waste collection and composting inside the toilet, while the other(s) are left outside to undergo further composting process. When the container in use fills up, it is sealed with a closed lid and taken outdoors to continue composting. The other composting container(s), which has now matured and is ready for use, is emptied of its contents—often utilized as fertilizer e.g. in gardens —and then placed back into the toilet to replace the recently filled container. This cyclical process ensures continuous use without interruption, as there is always one container ready to switch places with the full one, maintaining an efficient and sustainable cycle of waste management.

Above on the left side you see how a self-contained batch composting toilet called the Oz-e-Pod is emptied. On the right-side, you see how a split-system batch composting toilet called the Green Toilet Lux 330 is serviced.

Emptying a Continuous Composting Toilet

Continuous composting toilets are designed with a large composting container located below floor-level, separate from the toilet seat. These toilets are emptied usually through a hatch, located at the side of the composting unit. The composting container typically contains layers of waste: fresh waste at the top, partially composted material in the middle, and fully composted, ready-to-use fertilizer at the bottom. To empty the toilet, one uses a shovel to remove the mature compost from the bottom through the hatch, while leaving the less decomposed material above to continue composting. This method allows for gradual and ongoing removal of compost, ensuring that the system is continuously operational. If the toilet has not been used for an extended period, and all the contents have fully decomposed, the entire contents can be safely emptied and used as fertilizer.

CF 4 compost toilet (seen above) is an example of a continuous composting toilet that is emptied through a hatch at the backside of the composting unit.