Biological Phosphorus Removal Water Treatment Technology Services

Biological phosphorus removal technology is widely used in the treatment of domestic sewage, agricultural point source pollution and surface source pollution, as well as the treatment of eutrophication in water bodies. BOC Sciences provides biological phosphorus removal water treatment technology services to our clients. Our services include the design of phosphorus removal processes, technical support and project solutions.

Biological Phosphorus Removal Process

The specific biological phosphorus removal process is: under anaerobic conditions, parthenogenic bacteria polyphosphorus bacteria are inhibited, it must absorb organic carbon sources in the sewage (dissolved BOD conversion products, i.e. low-molecular volatile organic acids (VFAs)) to maintain survival, and intracellular conversion of organic matter into intracellular carbon energy storage poly-β-hydroxybutyrate (PHB)/polyhydroxyvalerate (PHV) storage, the energy required for this process comes from the hydrolysis of polyphosphate and the enzymatic digestion of intracellular glycolysis, thus completing the anaerobic release of phosphorus. Under aerobic conditions, PHB is revitalized and uses the energy generated by the oxidative metabolism of PHB/PHV to absorb several times more phosphorus than it needs for growth and store it as polyphosphate. According to the data, the phosphorus absorbed under aerobic conditions is 11 times more than the phosphorus released under anaerobic conditions, so the phosphorus in the water body can be absorbed into the bacterial cells in large quantities and then discharged from the system with the remaining sludge, thus achieving phosphorus removal.

Biological phosphorus removal process design

• Dissolved oxygen control

Firstly, strict anaerobic conditions must be controlled in the anaerobic zone. Secondly, sufficient dissolved oxygen should be supplied in the aerobic zone to meet the degradation of the PHB stored by the phosphorus-polymerizing bacteria and release enough energy for their excessive phosphorus uptake to effectively absorb the phosphorus in the wastewater.

• Control of nitrate nitrogen in anaerobic zone

The presence of nitrate nitrogen will also consume the organic substrate and inhibit the release of phosphorus by polyphosphorus bacteria, thus affecting the uptake of phosphorus by polyphosphorus bacteria under aerobic conditions.

• Temperature control

Under high, medium and low temperature conditions, different flora have the ability to biologically remove phosphorus. It needs to be controlled in the range of 5 to 30°C.

• pH control

The process of anaerobic release of phosphorus is more stable when the pH value is in the range of 6 to 8.

Biological phosphorus removal characteristics

1. Biological method of phosphorus removal is highly dependent on the concentration of organic matter (BOD) in the wastewater. Therefore, the biological phosphorus removal and denitrification process is suitable for treating medium to high BOD5 (≥ 200 mg/L) wastewater.

2. The effect of biological treatment is influenced by factors such as ambient temperature, pH, and dissolved oxygen. Biological phosphorus removal is suitable under neutral and slightly alkaline conditions.

3. The length of mud age also has a direct effect on the effect of phosphorus removal and nitrogen removal, so the biological treatment part should be discharged in time, otherwise the anaerobic bacteria will decompose the polyphosphorus in the sludge, resulting in the secondary release of phosphorus.

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