Applicability of Anaerobic Aerobic Biological Phosphorus Removal to Varuous Wastewater

通过明确除磷过程中有机底物代谢的机理，对厌氧好氧生物除磷工艺在不同废水中的适用性进行了实验研究。所得结果可总结如下：1。在厌氧条件下，对适应厌氧好氧工艺的积磷污泥投喂乙酸，乙酸被污泥吸收，形成聚羟基丁酸酯，同时消耗污泥中的碳水化合物。合成聚羟基丁酸酯所需的还原力可能来自先前积累的碳水化合物的降解。当其他酸，琥珀酸、丙酮酸、乳酸或丙酸厌氧添加到污泥中时，观察碳水化合物的消耗，就像乙酸的情况一样。污泥中的碳水化合物有望在厌氧条件下维持细胞的氧化还原平衡。这种功能可能是促进磷积累所需的特定代谢所必需的。不需要任何还原力就能转化为还原性聚合物的还原性太强的物质，或者氧化性太强而不能通过消耗碳水化合物提供的还原力来还原的物质，可能不适合作为厌氧好氧除磷过程的底物。在污泥的异化代谢中产生的ATP总量中，只有不到1%用于合成多磷酸盐。聚磷酸盐的积累不会大大降低生长的能量，这使得污泥能够将产量值（产生的VSS毫克/去除的TOC毫克）维持在所需的水平。建议今后的工作从基础的角度对氨基酸代谢进行研究，并研究如何将本文所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.