Effect of Photosynthetic bacteria soybean wastewater treatment and diversity of microbial species under nature light - micro oxygen condition

摘要

In this paper photosynthetic bacteria (PSB) soybean wastewater treatment with different proportion of contaminating bacteria under nature light micro oxygen conditions was studied. PCR-DGGE technique was adopted to study diversity of microbial species. PCR-DGGE technique was adopted to study diversity of microbial species. The results showed that in natural light - micro oxygen condition, COD removal and PSB biomass production could reach 65.7–67.9% and 308.7–357.1 mg/L separately with all PSB/contaminating-bacteria ratios. The PSB/contaminating-bacteria ratio did not affect COD removal and PSB biomass production. The types of microorganisms increased with the passage of time. PSB were still the dominate bacteria. This indicated that nature light - micro oxygen condition could keep PSB advantage in competition. For the PSB/contaminating-bacteria of 10∶1 group the change of microbial flora was not significant. For the PSB/contaminating-bacteria of 5∶1 group the change of microbial flora was significant.