Biological Phosphorus Elimination

Biological phosphorus elimination is getting more and more important in the recovery of phosphorus as a limited resource and for compliance with statutory limit values. With VIT®, the Bio-P process can be monitored with ease.

The Bio-P process

In contrast to chemical phosphate precipitation, the Bio-P process is an elegant, environmentally sustainable and cost-effective method for reduction of the phosphate concentration in the effluent. In addition, biological phosphate elimination generally allows for recovery of phosphorus, which is a limited resource.

The Microbiology

Biological phosporus elimination is characterized by polyphosphate-accumulating organisms (PAO), who absorb phosphate into their cells under aerobic conditions, and consequently remove it from the wastewater biologically. The PAO compete with the glycogen-accumulating organisms (GAO), who are targeting the same carbohydrate sources as PAO under anoxic conditions.

Control with VIT®

The ratio of PAO to GAO is essential for the stability of the Bio-P process and has to be montitored constantly. This can be done with the help of VIT® gene probe technology. VIT® gene probes enable you to visualize both of these important organism groups and to examine the current relation of both groups.

Phase contrast microscopic image of a wastewater sample

The same image after analysis with VIT®: PAO shine in red, GAO shine in green

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