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1.
Bioresour Technol ; 401: 130710, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38636880

RESUMO

The integration of high-rate activated sludge (HRAS), an effective carbon redirection technology, with partial nitritation/anammox (PN/A) is a novel AB treatment process for municipal wastewater. In this study, an airlift HRAS reactor was operated in the continuous inflow mode for 200 d at a wastewater treatment plant. The balance between potential PN/A system stability and peak HRAS performance under decreasing hydraulic retention time (HRT) was optimized. Energy consumption and recovery and CO2 emissions were calculated. The results showed that the optimal HRT suitable with the PN/A process was 3 h, achieving 2-3 g/L mixed liquor volatile suspended solid, 67.8 % chemical oxygen demand (COD) recovery, 81 % total COD removal efficiency, 2.27 ± 1.03 g COD/L/d organic loading rate, 62 % aeration reduction, and 0.24 kWh/m3 power recovery potential. Such findings hold practical value and contribute to the development of the optimal AB process capable of achieving energy autonomy and carbon neutrality.


Assuntos
Reatores Biológicos , Esgotos , Purificação da Água , Purificação da Água/métodos , Águas Residuárias/química , Análise da Demanda Biológica de Oxigênio , Eliminação de Resíduos Líquidos/métodos , Fatores de Tempo , Nitrogênio , Dióxido de Carbono , Oxirredução , Cidades
2.
Bioresour Technol ; 395: 130327, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38242244

RESUMO

Nitrite-oxidizing bacteria (NOB) seriously threaten the partial nitritation and Anammox (PN/A) process, hindering its mainstream application. Herein, a one-stage PN/A reactor was continuously operated for 245 days under nitrogen loading rate lifted from 0.4 g N/L/d to 0.6 g N/L/d and 0.8 g N/L/d with the nitrogen removal efficiency of 71 %, 64 %, and 41 %, respectively. Furthermore, the NOB species over time was identified as Nitrospira_sp._OLB3, exhibiting an increase of the relative abundance from 0.9 % to 4.3 %. The hydroxyapatite (HAP) granules gradually lost their microbiological function of Anammox bacteria then aged, leading to NOB dominance. Therefore, one "pulse therapy" was introduced and combined with "continuous enhancement" of Anammox sludge supported by sidestream to competitively limit the NOB dynamics. The treatment's effect persisted for around two months. The strategy that returning at least 50 % of the impaired HAP granular sludge to the sidestream for recultivation could fulfill the bottlenecks of mainstream PN/A.


Assuntos
Compostos de Amônio , Nitritos , Esgotos/microbiologia , Oxidação Anaeróbia da Amônia , Reatores Biológicos/microbiologia , Oxirredução , Bactérias , Nitrogênio , Durapatita
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