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...Chiang mai j sci http it science cmu ac th ejournal contributed paper a simple method for dna extraction from activated sludge dounghatai singka ladapa kumdhitiahutsawakul prasert rekkriangkrai and wasu pathom aree department of biology faculty university thailand energy research development institute nakornping author correspondence e mail p received july accepted november abstract protocol directly is described samples were lysed by glass bead ctab the extracted was purified with phenol chloroform isoamyl alcohol mixture precipitated in sodium acetate isopropanol proposed rapid required small sample size yielding about g quality good enough successful pcr amplifications s rdna v region denaturing gradient gel electrophoresis dgge analysis archaeal population this can also be applied to other environmental such as whey soil keywords introduction efficiency wastewater treatment however conventional methods mainly relies on formation plate or liquid culture are inadequate biological act...