described in attaway 39 285 effluent 40 flow rate into reactor 43 is maintained at a level consistent with maintaining a desired resident time within reactor 14 as suggested above air is circulated through reactor 43 at a rate sufficient to not limit biological oxidation reactor 43 is stirred using rotatable impeller 44 to prevent excessive foaming from the aeration and mixing of liquid 45 in reactor 43 antifoam 47 is added as needed through pump 48 within reactor 43 organics which were produced in reactor 14 are biologically converted to carbon dioxide and sludge the biochemistry within reactor 43 is best understood by reference to wastewater engineering supra the solution in reactor 43 is best maintained at about ph 7 0 8 5 preferably 7 0 and a temperature of about 32 u00b0 37 u00b0 c in order to maintain the desired ph acid 50 in the form of hc1 or base 51 in the form of naoh may be added as needed using pump 52 controlled by meter controller 31 connected to probe 53 effluent from reactor 43 may be discharged using pump 55 and may be of sufficient quality for discharge directly to sanitary sewer 57 sludge from reactor 43 comprising principally cell mass may be removed and disposed of by settling or filtration drying and landfill the invention provides a significant reduction in amounts of organic nutrients required to be added to the waste stream in attaway 39 285 the minimum ratio of organic nutrients to perchlorate ion was 4 1 whereas the ratio is as low as 1 8 1 in the present invention a significant reduction in the amount of solids sludge and cod leaving the anaerobic reactor is realized the cod ranges for the effluent were 2 600 3 600 mg l.