Fig. 4From: Enhancement of using combined packing materials on the removal of mixed sulfur compounds in a biotrickling filter and analysis of microbial communitiesCo-occurrence network showing the correlation between bacterial OTUs in BTF1 (left) and BTF2 (right). A connection stands for a strong (Spearman’s r > 0.8) and significant (Ajusted p-value< 0.001) correlation. The size of each node is proportional to the number of connections. Labels according to the taxonomic affiliations. The thickness of each connection between two nodes is proportional to the values of Spearman’s correlation coefficients. Nodes were colored by modularityBack to article page