According to the characters of aerobic-anaerobic coupled reactor (AAC) with effective treatment of wastewater and achievement of sludge reduction in tomato catsup processing

aerobic strains were isolated from the aerobic field of AAC

and 29 bacterial strains were obtained.The performances of these strains to tomato processing wastewater treatment were investigated by compatibility test.Six bacterial strains were determined as the dominant ones by TOC removal rate in 12 hours.A fundamental flora including 2 strains was constructed by comparing TOC removal rate

in which the TOC removal rate and the ratio of cell growth increment to TOC removal were 85.29% and 1.89

respectively.On this basis

an efficient flora including 7 strains was constructed by comparing the TOC removal rate

the ratio of cell growth increment to TOC removal and the settling ability.The ratio of cell growth increment to TOC removal of this efficient flora decreased to 0.94

and the ratio of sludge production to TOC removal was reduced by 50.26%.With this efficient flora

the sludge settling property improved obviously and the OD600 decreased to 0.347

and the effluent water quality met the second grade criteria of integrated wastewater discharge standard in China.