digesters filtration aerobic treatment DIGESTERS ADI's lab is equipped with a Challenge Environmental Model AER 200 anaerobic digester / aerobic respirometer for treatability evaluation of industrial wastes/ waste water and for toxicity evaluations of sanitation chemicals, etc.   ADI owns pilot plants for several technologies, e.g., ADI-BVF® digesters process, ADI-Hybrid process, and ADI-SBR process.