The university has installed three digesters to break down food waste faster so it can be disposed of down the drain. The school already composts food waste, but the new devices — the biggest is about the size of a washer and dryer — are expected to supercharge that process, cutting costs by 40 percent over traditional composting. Temple plans to put in smaller digesters at retail areas around campus to save money and become greener, as part of a larger plan to have zero net carbon emissions by 2050.