Abstract
The ratio of aeration/non-aeration is a key variable in the operation of a Sequencing Batch Reactor (SBR) for biological nutrient removal (BNR). To determine the ratio of aeration/non-aeration, the Oxidation Reduction Potential (ORP) and pH were monitored and evaluated as possible controlling factors in SBR operation. As a result of two steps, during the anaerobic phase, phosphorus release ended when the slopes of the variation curve of the pH and ORP were zero and −0.5, respectively. During the aerobic phase, the pH increased because of phosphorus uptake, suddenly decreased after phosphorus uptake, and increased again after nitrification. The result corresponded to the ammonia break point of the ORP. During the anoxic phase, the ORP bending point appeared if there were plenty of carbon sources, and the pH increased with the denitrification and decreased after the end of denitrification. It was concluded that the optimal ratio of aeration/non-aeration of SBR with a variable inflow could be determined by using ORP and pH profiles.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
