Applicability of Anaerobic Aerobic Biological Phosphorus Removal to Varuous Wastewater

通过对厌氧-好氧生物除磷工艺除磷过程中有机基质代谢机理的研究，探讨了厌氧-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.厌氧好氧驯化的聚磷污泥，在厌氧条件下，乙酸被污泥吸收，生成聚羟基丁酸酯，而污泥中的碳水化合物被消耗。聚羟基丁酸酯合成所需的还原能力可由先前积累的碳水化合物的降解提供。2.当将其它酸（琥珀酸、丙酸、乳酸或丙酸）厌氧添加到污泥中时，观察到碳水化合物消耗，如乙酸的情况。在厌氧条件下，污泥中的碳水化合物预期具有维持细胞中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。还原性过强的物质，如无还原力，可转化为还原性聚合物;氧化性过强的物质，如不能被消耗碳水化合物提供的还原力还原，则不适合作为厌氧好氧除磷工艺的底物。3.污泥异化代谢产生的ATP中，只有不到1%的ATP用于聚磷酸盐的合成。多聚磷酸盐的积累并没有使生长所需的能量减少太多，这使得污泥能够将产率值（产生的mg VSS/去除的mg TOC）保持在所需的水平。建议今后的工作从基本的角度对氨基酸代谢进行调查，并研究如何将这里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.