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Simultaneous recovery of nitrogen and phosphorus from actual digester centrate in an electrochemical membrane system.
- Source :
- Resources, Conservation & Recycling; Apr2024, Vol. 203, pN.PAG-N.PAG, 1p
- Publication Year :
- 2024
-
Abstract
- • Successful recovery of both nitrogen and phosphorus from real digester centrate is realized. • Addition of cation exchange membrane helps maintain pH in different chambers. • By-product of electrolysis - acid can be used for ammonia recovery. • Energy consumption and cost for nitrogen recovery can be potentially competitive. Recovering nutrients from wastewater will not only address pollution issues, but also reduce the need for nutrient from energy/resource - intensive production. Herein, a four-chamber electrochemical membrane system (4C-EMS) was developed to recover both nitrogen and phosphorus from real digester centrate through synergistically coupling electrodialysis with membrane contactor. The 4C-EMS successfully recovered more than 95 % of nitrogen and 85 % of phosphorus. The lowest specific energy consumption of 8.2 ± 0.2 kWh kg<superscript>−1</superscript> N was achieved under 1.25 mA cm<superscript>−2</superscript>. A byproduct of the electrolysis – acid could compensate for 10∼32 % of total acid needed for ammonia absorption. The 4C-EMS effectively reduced heavy metals in struvite by 98 % compared to the struvite formed directly from the digester centrate. A preliminary cost analysis examined the relationship between acid price and dosage and estimated the operating cost of $0.58∼0.83 kg<superscript>−</superscript><superscript>1</superscript> N; simultaneously recovered phosphorus would further increase the benefit of this system. [Display omitted] [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09213449
- Volume :
- 203
- Database :
- Supplemental Index
- Journal :
- Resources, Conservation & Recycling
- Publication Type :
- Academic Journal
- Accession number :
- 175392570
- Full Text :
- https://doi.org/10.1016/j.resconrec.2024.107463