According to The Zero-Waste Pet blog, the best way to get your cat’s litter free is to compost it – but only if you can make sure your compost warms up to at least 145 degrees Fahrenheit. If the manure is not heated, it can harm nature. If you don’t have a heated composting facility in your yard (like most people probably don’t), The Zero-Waste Pet recommends composting compostable cat litter that is not contaminated with waste. For the actual pooping and peeing, scoop it up in a biodegradable or paper bag and throw it in the trash.
Many of the above cat litter are compostable, so they can be disposed of by placing them on top of your compost heap. That said, you should never use the composted feces to grow fruits, vegetables, or any other plant that you plan to eat. According to Green Living Ideas, the amount of heat in a compost bin should be enough to remove any pathogens found in cat droppings. However, you need to judge for yourself how to proceed from there.