Environmental Microbial dephosphorous bacteria for sewage

What is phosphorus

What we call dephosphorization dephosphorization actually degrades the total phosphorus. It is the result of determination of water samples after digestion to convert various forms of phosphorus to orthophosphate, and is measured in milligrams of phosphorus per liter of water sample. It has or can be said to be the sum of inorganic phosphorus and organic phosphorus.

1) Phosphorus release under anaerobic conditions

Facultative bacteria convert soluble BOD5 into low molecular volatile organic acid VFA by fermentation in the absence of dissolved oxygen or nitrate nitrogen. These fermentation products or VFA from raw sewage are absorbed by phospho-solubilizing bacteria and transported to the cell, where they are assimilated into intracellular carbon energy storage substance PHB. The required capacity is derived from the hydrolysis of phosphorus and the hydrolysis of intracellular sugars, leading to the release of phosphate.

2) Phosphorus uptake under aerobic conditions

Under aerobic conditions, the activity of P-accumulating bacteria was restored, and the amount of phosphorus exceeding the growth requirement was stored in the form of P-accumulating bacteria. Energy was generated through oxidative metabolism of PHB, which was used for P absorption and P synthesis. Energy was captured and stored in the form of high-energy bonds of polyphosphoric acid, and phosphate was removed from water.

3) Discharge of phosphorus-rich sludge

The resulting phosphorus-rich sludge is discharged in the form of residual sludge, thereby removing phosphorus. From the perspective of energy, phosphorus accumulating bacteria release phosphorus to obtain energy to absorb dissolved organic matter in wastewater under anaerobic conditions, and then dehydrolyze and absorb dissolved organic matter to obtain energy to absorb phosphorus under aerobic conditions.