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Investigation and optimization of the SND–SBR system for organic matter and ammonium nitrogen removal using the central composite design
Author(s) -
Masoudi Seyed Mohammad Ali,
Hedayati Moghaddam Amin,
Sargolzaei Javad,
Darroudi Abolfazl,
Zeynali Vahid
Publication year - 2017
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12847
Subject(s) - wastewater , leachate , nitrogen , central composite design , chemistry , nitrification , ammonium , pulp and paper industry , cow dung , sequencing batch reactor , response surface methodology , chemical oxygen demand , sodium acetate , organic matter , sewage treatment , environmental chemistry , waste management , environmental engineering , environmental science , chromatography , organic chemistry , engineering , fertilizer
Wastewater containing ammonia nitrogen compounds is considered as a harmful material to environment due to eutrophication and toxicity effects; hence, finding practical methods for treating this type of wastewater seems necessary. In this study, performance of two sequencing batch reactors have been assessed for simultaneous nitrification and denitrification in treating synthesized wastewater containing ammonium nitrogen, using leachate obtained from cow dung as the biomass. The leachate obtained from cow dung as the source of bio‐sludge added to the reactors. Experiments were designed according to central composition design and response surface methodology with four operating variables including pH (6, 7.5, 9), cycle time (CT) (4, 12, 20 h), C O D / N H 4 + − N ratio (5, 10, 15) and carbon source (Sodium acetate: S B R S , Glucose: S B R G ). According to statistical analysis, experimental responses were in acceptable agreement with model predictions. CT was the most important operating variable in chemical oxygen demand (COD) and N H 4 + − N removal. The maximum percentage of ammonium nitrogen removal was attained at pH 7.5 and CT 21.5 h. The optimum conditions were composed of pH 7.67, CT 19.15 h, C O D / N H 4 + − N 10.95 and sodium acetate as carbon source, while COD, N H 4 + − N and total nitrogen removals were 94.96%, 94.93% and 93.60%, respectively. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1638–1646, 2018