SRR3509069 V4 fragment of activated sludge metagenome (CWT) SRR3509070 V4 fragment of activated sludge metagenome (GC) SRR3509071 V4 fragment of activated sludge metagenome (HT) SRR3509072 V4 fragment of activated sludge metagenome (PST) SRR3509073 V4 fragment of activated sludge metagenome (AT) SRR3509074 V4 fragment of activated sludge metagenome (SST) SRR3509075 V4 fragment of activated sludge metagenome (OT) SRR3509076 V4 fragment of activated sludge metagenome (FST)