Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 2 de 2
Filtrar
Mais filtros











Base de dados
Intervalo de ano de publicação
1.
Bioresour Technol ; 141: 35-40, 2013 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-23561953

RESUMO

This study investigated impact of food to microorganism (F/M) ratio and colloidal chemical oxygen demand (COD) on nitrification performance in one full-scale membrane bioreactor (MBR) treating monoethanolamine (MEA)/dimethyl sulfoxide (DMSO)-containing thin film transistor liquid crystal display (TFT-LCD) wastewater. Poor nitrification was observed under high organic loading and high colloidal COD conditions, suggesting that high F/M ratio and colloidal COD situations should be avoided to minimize their negative impacts on nitrification. According to the nonmetric multidimensional scaling (NMS) statistical analyses on terminal restriction fragment length polymorphism (T-RFLP) results of ammonia monooxygenase (amoA) gene, the occurrence of Nitrosomonas oligotropha-like ammonia oxidizing bacteria (AOB) was positively related to successful nitrification in the MBR systems, while Nitrosomonas europaea-like AOB was positively linked to nitrification rate, which can be attributed to the high influent total nitrogen condition. Furthermore, Nitrobacter- and Nitrospira-like nitrite oxidizing bacteria (NOB) were both abundant in the MBR systems, but the continuously low nitrite environment is likely to promote the growth of Nitrospira-like NOB.


Assuntos
Reatores Biológicos , Águas Residuárias/química , Purificação da Água/métodos , Análise da Demanda Biológica de Oxigênio , Coloides , Cristais Líquidos , Nitrificação , Nitrosomonas/isolamento & purificação , Águas Residuárias/microbiologia
2.
Bioresour Technol ; 122: 70-7, 2012 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-22595093

RESUMO

This study investigated nitrification performance and nitrifying community in one full-scale membrane bioreactor (MBR) treating TFT-LCD wastewater. For the A/O MBR system treating monoethanolamine (MEA) and dimethyl sulfoxide (DMSO), no nitrification was observed, due presumably to high organic loading, high colloidal COD, low DO, and low hydraulic retention time (HRT) conditions. By including additional A/O or O/A tanks, the A/O/A/O MBR and the O/A/O MBR were able to perform successful nitrification. The real-time PCR results for quantification of nitrifying populations showed a high correlation to nitrification performance, and can be a good indicator of stable nitrification. Terminal restriction fragment length polymorphism (T-RFLP) results of functional gene, amoA, suggest that Nitrosomonas oligotropha-like AOB seemed to be important to a good nitrification in the MBR system. In the MBR system, Nitrobacter- and Nitrospira-like NOB were both abundant, but the low nitrite environment is likely to promote the growth of Nitrospira-like NOB.


Assuntos
Bactérias/metabolismo , Reatores Biológicos/microbiologia , Cristais Líquidos/microbiologia , Membranas Artificiais , Nitrificação , Transistores Eletrônicos/microbiologia , Purificação da Água/instrumentação , Aerobiose , Biodegradação Ambiental , Análise da Demanda Biológica de Oxigênio , Nitratos/análise , Nitrogênio/análise , Oxirredução , Polimorfismo de Fragmento de Restrição , Compostos de Amônio Quaternário/análise , Reação em Cadeia da Polimerase em Tempo Real , Esgotos/microbiologia , Eliminação de Resíduos Líquidos , Águas Residuárias/microbiologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA