Applicability of Anaerobic Aerobic Biological Phosphorus Removal to Varuous Wastewater

通过对厌氧好氧生物除磷工艺中有机底物代谢机理的研究，评价厌氧好氧生物除磷工艺对不同废水的适用性。主要研究结果如下：1.在厌氧条件下，向驯化为厌氧好氧工艺的聚磷污泥投加醋酸后，醋酸盐被吸收到污泥中，生成聚羟基丁酸酯，同时消耗污泥中的碳水化合物。合成多羟基丁酸酯所需的还原功率可能来自先前积累的碳水化合物的降解。2.当其他酸，如丁二酸、丙酮酸、乳酸或丙酸厌氧添加到污泥中时，碳水化合物的消耗被观察到，就像对醋酸的情况一样。在厌氧条件下，污泥中的碳水化合物有望具有维持细胞内氧化还原平衡的功能。这一功能在促进磷积累所需的特定代谢中可能是必不可少的。可以在没有任何还原能力的情况下转化为还原聚合物的过于还原的物质，或过于氧化而不能被碳水化合物消耗提供的还原动力还原的物质，可能不适合用于厌氧除磷工艺。3.利用污泥异化代谢产生的ATP总量的不到1%用于聚磷酸盐的合成。聚磷酸盐的积累不会使生长所需的能量减少很多，使污泥的产生值(产生的mg VSS/去除的mg TOC)保持在所需的水平。建议在未来的工作中从基本的角度对氨基酸代谢进行研究，并研究如何将所获得的结果应用于厌氧好氧工艺的实际操作。

Experimental study was carried out to evaluate the applicability of anaerobic aerobic biological phosphorus removal process to various wastewaters, by making clear the mechanism of organic substrate metabolism in the course of phosphporus removal process. Results obtained can be summarized as follows.1.When acetic acid is fed to the phosphorus accumulating sludge which is acclimatized to anaerobic aerobic process, acetate is uptaken to the sludge and poly hydroxy butyrate is formed, while carbohydrate in the sludge is consumed, under anaerobic conditions. The reducing power required for poly hydroxy butyrate synthesis may be supplied from the degradation of the previously accumulated carbohydrate.2.When other acid, succinic, pyruvic, lactic or propionic acid, is anaerobically added to the sludge, the carbohydrate consumption is observed, as is the case with acetic acid. Carbohydrate in the sludge is expected to have a function of maintaining the redox balance in the cell under anaerobic conditions. This function may be essential in a particular metabolism required to promote phosphorus accumulation. Too reductive substances which can be conversted to reductive polymers without any reducting power, or substances which are too oxidative to be reduced by the reducing power supplied from the consumption of carbohydrate, may not be suitable substrates for the anaerobic aerobic phosphorus removal process.3.Less than 1% of the total amount of ATP produced in the dissimilative metabolism of the sludge is utilized for polyphosphate synthesis. The energy for growth is not reduced very much by polyphosphate accumulation, which enables the sludge to maintain the yield value (mg VSS produced/mg TOC removed) at a required level.It is recommended for future works to carry out an investigation on amino acid metabolism from a fundamental point of view, and to examine how we can apply the results obtained here to practical operation of the anaerobic aerobic process.