Unlike wet digesters that process pumpable slurries, high solids (dry--stackable substrate) digesters are designed to process solid substrates deposited in tunnel-like chambers with a gas-tight door.
Unlike wet digesters that process pumpable slurries, high solids (dry--stackable substrate) digesters are designed to process solid substrates without the addition of water. In batch tunnel digesters, the feedstock is deposited in tunnel-like chambers with a gas-tight door.