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In this study, four sequencing batch reactors (SBR), with the sludge retention time (SRT) of 5, 10, 20 and 40 d, were used to treat domestic wastewater, and the effect of SRT on nitrite accumulation in the biological nitrogen removal SBR was investigated. The real-time control strategy based on online parameters, such as pH, dissolved oxygen (DO) and oxidation reduction potential (ORP), was used to...
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