Biological CNP removal from meat-processing wastewater in an innovative high rate up-flow A2O bioreactor.
Chemosphere
; 213: 197-204, 2018 Dec.
Article
em En
| MEDLINE
| ID: mdl-30223124
ABSTRACT
A high rate up-flow anaerobic, anoxic and oxic (A2O) bioreactor was designed and operated for meat-processing wastewater (MPW) treatment as a single cost-effective system with the aim of simultaneous CNP removal. The influence of three essential factors, HRT, COD/TN ratio and aerated volume fraction on the reactor performance was assessed using response surface methodology (RSM). The required HRT to reach 98.5% COD removal was achieved at 7.5â¯h. Simultaneous CNP removal under denitrification rate of 199.4â¯mg/l.d gave high nitrate to nitrogen gas conversion of 74.6â¯mg/l. An HRT, COD/TN ratio and aerated volume fraction of 10â¯h, 10020 and 60%, respectively, was a favored condition for an efficient nitrogen removal with effluent total Kjeldahl nitrogen (TKN) less than 70â¯mg/l. Under optimum condition, an HRT, COD/TN and aerated volume fraction of 8â¯h, 10014 and 65%, respectively, resulted an effluent phosphorus of 43â¯mg/l, but 93.97â¯mg/l phosphorus was released in an anaerobic condition at 6â¯h. An effluent with a low turbidity of about 1.5 NTU and a sludge volume index (SVI) of 75.9â¯ml/g was achieved using at HRT of 12.5â¯h, COD/TN ratio of 100 8 and aerated volume fraction of 50%. Under these conditions, the removal efficiencies for COD, TKN, nitrate-nitrogen (NO3--N), total nitrogen (TN) and phosphorus (PO43--P) were obtained to be 98.33, 92.06, 91.97, 90.48 and 83.48%, respectively. As a result, the application of the up-flow A2O bioreactor is a promising configuration to get hygienic water from wastewater.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Eliminação de Resíduos Líquidos
/
Reatores Biológicos
/
Águas Residuárias
Idioma:
En
Revista:
Chemosphere
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Irã