Phosphorus removal using novel crystallisation technology.

Area of Science:

• Environmental Engineering
• Water Treatment Technologies
• Industrial Wastewater Management

Background:

• Soy protein facilities face challenges meeting stringent effluent phosphorus (P) limits (<2 mg L(-1)).
• Previous P removal methods were ineffective or generated excessive sludge and high salt concentrations.
• Discharge regulations necessitate advanced P reduction strategies for industrial effluents.

Purpose of the Study:

• To evaluate a novel lime precipitation technology for effective phosphorus removal from soy protein manufacturing effluent.
• To assess the technology's ability to meet stringent P discharge limits without increasing soluble salt levels.
• To demonstrate a viable solution for industrial wastewater P management.

Main Methods:

• Pilot-scale testing of a novel lime precipitation and crystallization technology.
• Effluent analysis for total phosphorus (P) and soluble salt concentrations at pH 10.
• Evaluation of particle settling characteristics and sludge generation.
• Comparison with previously evaluated biological and chemical P removal methods.

Main Results:

• The lime precipitation technology successfully reduced effluent P to <2 mg L(-1).
• No increase in soluble salt levels was observed during the process.
• Rapidly settling, filterable particles were produced with minimal carbonate removal.
• Residual solids generation was significantly lower (40%) compared to full lime softening.

Conclusions:

• Novel lime precipitation with crystallization is a highly effective method for industrial P removal.
• This technology meets strict environmental discharge standards for phosphorus without increasing salinity.
• The system provides a sustainable and efficient solution for soy protein plant wastewater treatment.