Enhanced Nitrification of High-Ammonium Reject Water in Lab-Scale Sequencing Batch Reactors (SBRs) DOI Open Access

Sandeep Gyawali,

Eshetu Janka, Carlos Dinamarca

и другие.

Water, Год журнала: 2025, Номер 17(9), С. 1344 - 1344

Опубликована: Апрель 30, 2025

Dewatering anaerobic digested sludge leaves a liquid fraction known as reject water, organic fertilizer containing high amounts of ammonium nitrogen (NH4-N). However, its concentration should be enhanced to produce commercial fertilizer. Thus, water nitrification for stabilization well nitrate capture in biochar used slow-release is proposed. This study attempted accomplish by tuning the operating parameters two lab-scale sequential-batch reactors (SBRs), which were fed (containing 520 ± 55 mg NH4-N/L). Sufficient alkalinity per stoichiometric value was needed maintain pH and free nitrous acid (FNA) within optimum range. A loading rate (NLR) 0.14 0.01 kg/m3·d 3.34 days hydraulic retention time (HRT) helped achieved complete 100% reactor 1 (R1) on day 61 2 (R2) 82. After well-developed bacterial biomass, increasing NH4-N up 750 85 mg/L NLR 0.23 0.03 did not affect process. Moreover, feeding sequence once provided adequate contact between nitrifying resulting nitrification. It can concluded that stable with quick adjustment loading, alkalinity, HRT SBRs.

Язык: Английский

Enhanced Nitrification of High-Ammonium Reject Water in Lab-Scale Sequencing Batch Reactors (SBRs) DOI Open Access

Sandeep Gyawali,

Eshetu Janka, Carlos Dinamarca

и другие.

Water, Год журнала: 2025, Номер 17(9), С. 1344 - 1344

Опубликована: Апрель 30, 2025

Dewatering anaerobic digested sludge leaves a liquid fraction known as reject water, organic fertilizer containing high amounts of ammonium nitrogen (NH4-N). However, its concentration should be enhanced to produce commercial fertilizer. Thus, water nitrification for stabilization well nitrate capture in biochar used slow-release is proposed. This study attempted accomplish by tuning the operating parameters two lab-scale sequential-batch reactors (SBRs), which were fed (containing 520 ± 55 mg NH4-N/L). Sufficient alkalinity per stoichiometric value was needed maintain pH and free nitrous acid (FNA) within optimum range. A loading rate (NLR) 0.14 0.01 kg/m3·d 3.34 days hydraulic retention time (HRT) helped achieved complete 100% reactor 1 (R1) on day 61 2 (R2) 82. After well-developed bacterial biomass, increasing NH4-N up 750 85 mg/L NLR 0.23 0.03 did not affect process. Moreover, feeding sequence once provided adequate contact between nitrifying resulting nitrification. It can concluded that stable with quick adjustment loading, alkalinity, HRT SBRs.

Язык: Английский

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