Interactions among sulfur, iron and nitrogen oxidation-reduction bacteria, and poly-P accumulating bacteria in the activated sludge.

考察了活性污泥中硫、铁、氮氧化还原细菌和聚磷菌之间的相互作用，以控制污泥的膨胀和营养去除。硫酸盐还原细菌与硫氧化细菌共存，在活性污泥絮体中产生生态位。在厌氧条件下，由于产生醋酸盐，它们加速了磷酸盐的释放。活性污泥中存在生物铁氧化还原现象。硫氧化细菌在好氧条件下与铁氧化细菌竞争氧气。在厌氧条件下，反硝化、硫酸盐还原、铁还原和磷释放同时发生。它们是根据热力学优势发生的。硫酸盐还原细菌与铁还原细菌竞争氢气。铁混凝剂抑制了硫酸盐还原，有效地改善了丝状菌的膨胀。它们还能有效地抑制废弃污泥在储存过程中硫化氢的产生和磷的释放。

Interactions among sulfur, iron and nitrogen oxidation reduction bacteria, and poly-P accumulation bacteria in the activated sludge was examined to control bulking and nutrient removal. Sulfate reducing bacteria coexisted with sulfur oxidizing bacteria and produced ecological niche in the activated sludge flocs. They accelerated phosphate release in the anaerobic conditions due to produced acetate. Biological iron oxidation and reduction occurred in the activated sludge. Sulfur oxidizing bacteria competed oxygen with iron oxidizing bacteria in the aerobic conditions. In the anaerobic conditions, denitrification, sulfate reduction, iron reduction and phosphate release occurred simultaneously. They occurred according to thermodynamic advantage. Sulfate reducing bacteria competed hydrogen with iron reducing bacteria. Iron coagulant were effective to improve filamentous bulking due to suppress sulfate reduction. They were also effective to suppress production of hydrogen sulfide and phosphate release in the wasted sludge during storage.