CalPrex
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High-Efficiency P-Recovery and Digester Protection
Fermentation: the Biological Solution for Phosphorus Solubilization
CalPrex works with high concentrations of soluble phosphorus and is a viable solution for utilities seeking to mitigate operations and maintenance issues related to struvite scaling and poor sludge dewaterability.
The end recovered product, brushite, is a fertilizer comparable to leading phosphate fertilizers on the market today.
This high-value solution is for facilities needing phosphorus removal and recovery:
- Prior to thermal hydrolysis
- From waste activated sludge and/or primary sludge prior to anaerobic digestion
- From aerobic or post-aerobic digestion (PAD)
CalPrex reactor sits between the fermentation tank and gas phase digesters.
Fermentation for 12-36 hours prior to the anaerobic digester provides a low oxygen environment.
- Facilitates the rapid release of soluble phosphorus in Bio-P sludge along with the dissolution of crystalized and organically-bound phosphorus
- Over 60% solubilization of P can occur in the fermentation without using any additional chemicals
- In non-Bio-P plants, up to 40% of the phosphorus solubilizes using a fermentation step
Fermented sludge is dewatered.
Centrate is sent to the CalPrex reactor.
- Centrate precipitates the dissolved phosphorus with the addition of calcium hydroxide
- Maintains the solution around 6.5 pH
- Recovers phosphorus as a brushite crystal (CaHPO4•2H2O)
Contact Centrisys/CNP for pilot testing capabilities.
Request a Sample Analysis or Pilot Test
High-Efficiency P-Recovery and Digester Protection
| Centrate Recovery | WAS Fermentation + Centrate Recovery | CalPrex® | |
|---|---|---|---|
| Reduce Phosphorus Recyle | ✓ | ✓ | ✓ |
| Recovery of Marketable Fertilizer | ✓ | ✓ | ✓ |
| Reduce Struvite Maintenance | ✓ | ✓ | ✓ |
| Reduce Digester Struvite Buildup | X | ✓ | ✓ |
| Compact Reactor | X | X | ✓ |
| Recover P from No/Low Ammonia System | X | X | ✓ |
| Recover P from Non-Bio-P Plant | X | X | ✓ |
| Lower Chemical Cost Per P Recovered | X | X | ✓ |
| Lower Chloride Addition Per P Recovered | X | X | ✓ |
| High Total P Capture | X | X | ✓ |
| Reduce Phosphorus Recyle | ✓ |
| Recovery of Marketable Fertilizer | ✓ |
| Reduce Struvite Maintenance | ✓ |
| Reduce Digester Struvite Buildup | X |
| Compact Reactor | X |
| Recover P from No/Low Ammonia System | X |
| Recover P from Non-Bio-P Plant | X |
| Lower Chemical Cost Per P Recovered | X |
| Lower Chloride Addition Per P Recovered | X |
| High Total P Capture | X |
| Reduce Phosphorus Recyle | ✓ |
| Recovery of Marketable Fertilizer | ✓ |
| Reduce Struvite Maintenance | ✓ |
| Reduce Digester Struvite Buildup | ✓ |
| Compact Reactor | X |
| Recover P from No/Low Ammonia System | X |
| Recover P from Non-Bio-P Plant | X |
| Lower Chemical Cost Per P Recovered | X |
| Lower Chloride Addition Per P Recovered | X |
| High Total P Capture | X |
| Reduce Phosphorus Recyle | ✓ |
| Recovery of Marketable Fertilizer | ✓ |
| Reduce Struvite Maintenance | ✓ |
| Reduce Digester Struvite Buildup | ✓ |
| Compact Reactor | ✓ |
| Recover P from No/Low Ammonia System | ✓ |
| Recover P from Non-Bio-P Plant | ✓ |
| Lower Chemical Cost Per P Recovered | ✓ |
| Lower Chloride Addition Per P Recovered | ✓ |
| High Total P Capture | ✓ |
| Reduce Phosphorus Recyle | ✓ |
| Recovery of Marketable Fertilizer | ✓ |
| Reduce Struvite Maintenance | ✓ |
| Reduce Digester Struvite Buildup | X |
| Compact Reactor | X |
| Recover P from No/Low Ammonia System | X |
| Recover P from Non-Bio-P Plant | X |
| Lower Chemical Cost Per P Recovered | X |
| Lower Chloride Addition Per P Recovered | X |
| High Total P Capture | X |
| Reduce Phosphorus Recyle | ✓ |
| Recovery of Marketable Fertilizer | ✓ |
| Reduce Struvite Maintenance | ✓ |
| Reduce Digester Struvite Buildup | ✓ |
| Compact Reactor | X |
| Recover P from No/Low Ammonia System | X |
| Recover P from Non-Bio-P Plant | X |
| Lower Chemical Cost Per P Recovered | X |
| Lower Chloride Addition Per P Recovered | X |
| High Total P Capture | X |
| Reduce Phosphorus Recyle | ✓ |
| Recovery of Marketable Fertilizer | ✓ |
| Reduce Struvite Maintenance | ✓ |
| Reduce Digester Struvite Buildup | ✓ |
| Compact Reactor | ✓ |
| Recover P from No/Low Ammonia System | ✓ |
| Recover P from Non-Bio-P Plant | ✓ |
| Lower Chemical Cost Per P Recovered | ✓ |
| Lower Chloride Addition Per P Recovered | ✓ |
| High Total P Capture | ✓ |
Maximize phosphorus recovery and streamline operations with CalPrex & MagPrex.
This synergistic system recovers more than 50% of incoming phosphorus with minimal chemical input. With the added benefits of reduced sludge production and lower operational costs, this advanced solution positions your plant at the forefront of resource recovery technology. Learn how this innovative pairing can enhance your plant's efficiency and turn phosphorus into a profitable resource.
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