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Updated: Jul 10, 2025

Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Published on: January 22, 2015

Recovery of Nutrients from Cod Processing Waters.

Jorge Coque¹, Charlotte Jacobsen¹, Bita Forghani²

¹National Food Institute, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.

|November 24, 2023

Summary

Protein and phosphorus recovery from salted cod processing water was optimized using flocculation and ultrafiltration. Different flocculant treatments effectively separated nutrients based on salt content, aiding sustainable food industry practices.

Keywords:

flocculants flocculation microfiltration phosphorus protein ultrafiltration

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Area of Science:

Food Science and Technology
Biotechnology
Environmental Engineering

Background:

Food industry liquid side-streams offer potential for reuse in food applications.
Processing these streams reduces industrial environmental impact.
Salted cod processing generates protein- and phosphorus-rich wastewater.

Purpose of the Study:

To evaluate protein and phosphorus separation from low (LS) and high (HS) salt cod processing waters.
To assess the effectiveness of microfiltration, ultrafiltration, and flocculation.
To optimize flocculant type, concentration, and maturation time.

Main Methods:

Investigated microfiltration, ultrafiltration, and flocculation techniques.
Evaluated chitosan lactate and Levasil RD442 as flocculants at varying concentrations.
Assessed maturation periods of 0, 1, and 3 hours.
Compared nutrient recovery from LS and HS process waters.

Main Results:

Flocculation treatments yielded different nutrient recoveries based on salt content.
LS protein recovery: 51.4% with Levasil RD442 (0.25%, 0h maturation).
LS phosphorus recovery: 34.7% with Levasil RD442 (1.23%, 1h maturation).
HS protein recovery: 51.8% with Levasil RD442 (1.23%, 1h maturation).
HS phosphorus recovery: 47.1% with Levasil RD442 (1.23%, 0h maturation).
Ultrafiltration was more effective for HS, recovering 57% protein and 46% phosphorus.

Conclusions:

Salt content influences nutrient interactions with flocculants.
Optimized flocculation and ultrafiltration can efficiently recover valuable nutrients.
These methods support the valorization of food industry wastewater.