Functional metagenomic libraries generated from anthropogenically impacted environments reveal importance of metabolic genes in biocide and antibiotic resistance

•Functional libraries from three environments were screened for biocide resistance.•Biocide resistance was common in textile effluent remediating soil and sewage cake.•Putative resistance genes were characterised.•GalE like genes were most common and conferred reduced antibiotic susceptibility.•GalE like genes were potentially mobilizable.