A comparative study on the influence of two surfactants on acidogenesis of waste activated sludge
两种表面活性剂对剩余污泥产酸影响的比较研究

The influence of two surfactants (amphoteric and cationic) on the acidogenesis of waste activated sludge (WAS) was investigated in the batch reactors at room temperature. Results showed that the volatile fatty acid (VFA) production was improved by the both two surfactants. On the forth day of fermentation the VFA production was 226.4mg·L-1 (COD based) at a ratio of amphoteric surfactant dosage to dry sludge of 0.1g·g-1, and it was 861.4mg·L-1 at 0.1g·g-1 cationic surfactant dosage, while it was only 3.2mg·L-1 in the blank test. It was also observed that the VFA production increased with the dosage of surfactant. Further investigations showed that when the surfactant dosage was below 0.2 g·g-1, the VFA production with the amphoteric surfactant was about half of that with the cationic surfactant, but the maximum VFA production with these two surfactants was almost the same at a surfactant dosage of 0.3 g·g-1. In addition, the distribution of individual VFA was also influenced by surfactants.