title: pooled samples of microbial communities from anaerobic digesters under continuous operation
design: Six continuous reactors spanning 2 years of operation. Three control reactors were kept unchanged throughout. The three treatment reactors experienced 1) addition of new substrate (poultry waste in addition to dairy waste); 2) process collapse from overloading; 3) recovery from collapse by step-wise increase in feeding rate; and 4) change in substrate (remove poultry waste from feeding).