Ten yeast stains were grouped and applied in pilot-scale sequencing batch reactors to treat oil-containing wastewater. The efficiency and stability of different reactors were discussed and yeast community structure was investigated by PCR-DGGE method. The results show: the group consisting of O2, G1 and W1 is markedly superior to others in efficiency and stability respects; the group absence of these 3 stains fails to form a system with high efficiency and good stability; O4 and G2 strains lead to turbid supernatant fluid and are eliminated from system step by step; the distribution of yeast cells in settlement sludge varies with different stains. When aeration is stopped, G1 deposits into lower layer but O2 or W1 distributes evenly.
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