SUMMARY
Upflow anaerobic sludge blanket (UASB) reactors are most widely implemented setup for anaerobic treatment of wastewaters with a high organic load. Even though these are very efficient systems and methane production from organic waste makes them energetically attractive, its implementation in developing countries is still hampered not just because of financial reasons, but because of its relatively difficult operation. For this reason, it is crucial to maintain a number of installed lab-scale UASB reactors for training of technicians and professionals. Unfortunately, the installation costs might be prohibitive for low income laboratories. As scientific literature usually focuses on results obtained using UASB reactors, but rarely focuses on construction details, here we present a detailed description of the building of a low budget UASB reactor for research and instruction in the Antonio Nariño University environmental engineering labs.