BASIC STUDY ON BIOPHOSPHORITE PRODUCTION BY ENHANCING BACTERIAL ABILITY TO SYNTHESIZE PHOSPHATE BIOPOLYMERS.

废水中的磷会造成环境污染。另一方面，磷在粮食生产的肥料中是必不可少的。然而，天然磷资源正在消失。本研究的目的是开发一种从活性污泥中回收磷的生物工艺，以防止环境污染和避免磷的可用性危机。在强化生物除磷过程中，污泥细菌积累了大量的聚磷酸盐（polyP）.活性污泥在70 ℃加热1 ~ 2 h即可释放聚磷。释放的聚P可以容易地通过添加氯化钙沉淀而无需pH控制。沉淀物的磷含量超过了天然磷矿床（NPD）的磷含量。相反，他们有一个相对较低的钙含量，当与NPD.The实验室规模的废水系统，再加上磷回收过程中，表现出高，至少两个月的运行稳定的性能。该系统将为磷的循环利用和富营养化控制做出巨大贡献。

Phosphorus in wastewaters causes environmental pollution. On the other hand, phosphorus is essential in fertilizers for food production. However, natural phosphorus resources are being dissipated. The purpose of this research is to develop a bioprocess for recovering phosphorus from activated sludge, intending to prevent environmental pollution and to avert a crisis in phosphorus availability. In enhance biological phosphate removal, sludge bacteria accumulate large quantities of polyphosphate (polyP). The polyP could be released from activated sludge simply by heating at 70oC for one or two h. Released polyP could be easily precipitated by the addition of calcium chloride without pH control. The phosphorus content of the precipitates surpassed those of natural phosphorite deposits (NPD). Conversely, they had a relatively low calcium content, when compared with those of NPD.The bench-scale wastewater system, coupled with a process for phosphorus recovery, showed the high, stable performance for at least two months of operation. The present system will make a great contribution to both phosphorus recycling and eutrophication control.