Membrane contactor onsite piloting for nutrient recovery from mesophilic digester reject water: The effect of process conditions and pre-treatment options
نویسندگان
چکیده
Nutrient recovery is an important segment of the circular economy, and it significantly contributes to sustainable development goals. This work reports on outcomes a field testing pilot-scale membrane contactor system designed for nitrogen (N) phosphorous (P) in form high purity ammonium salts high-quality P containing sludge. The pilot was conducted at Viikinmäki WWTP using digester reject water under different treatment conditions. Our showed tolerance solids (concentration > 500 mg/L). Field test trials that higher feed flow, better ammonia transfer rate. Decreasing retention time from 4 h 2 increased mass rate constant by >150 %. Among tested pH levels, 10 had highest removal, which turn resulted percentage. A acid concentration lowered Strong acids such as HNO3 H2SO4 than H3PO4. Pre-treating feedwater with starch same accumulation poly-aluminum chloride (PAX)/polymer pre-treatment. PO4?3 removal 99 % achieved PAX/polymer 10, whereas total 77 treatment. produced sludge consists mainly CaCO3 emanating used lime, can be soil amendment. were have nutrient content comparable commercial fertilizers. study provides insights into selection process parameters systems based goal treatment, whether or recovery.
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ژورنال
عنوان ژورنال: Separation and Purification Technology
سال: 2022
ISSN: ['1873-3794', '1383-5866']
DOI: https://doi.org/10.1016/j.seppur.2022.122250