Monitoring pH and ORP in a SHARON reactor

6533b7dafe1ef96bd126eb4f

RESEARCH PRODUCT

Monitoring pH and ORP in a SHARON reactor

J. Serralta José Ferrer D. Aguado J. Claros Aurora Seco

subject

INGENIERIA HIDRAULICA Denitrification PH Laboratory method Oxidation reduction potential Nitrite Oxic conditions Waste Disposal Fluid chemistry.chemical_compound Dissolved oxygen Electric conductivity Bioreactors Electrical conductivity Anaerobiosis Nitrite Control system Water Science and Technology Time evolutions Chemistry PH effects Hydrogen-Ion Concentration Probe Anoxic waters Nitrification Aerobiosis Partial nitrification Real time Nitritation Environmental chemistry Pollutant removal Denitrification Single reactor system for high activity ammonium removal over nitrite reactor Redox potential Oxidation-Reduction Environmental Monitoring ORP Optimization Detection method Environmental Engineering Online monitoring Monitoring Ammonia removal Article SHARON reactor Anoxic sediments Ammonia Reduction potential Ammonia Oxidation Bioreactor Aerobic phase On-line measurement Nitrites TECNOLOGIA DEL MEDIO AMBIENTE SHARON Methanol Denitrification process Reactor Nitrogen removal Real time control Laboratory scale Monitoring system Nitrification Probes Methanol Oxidation reduction reaction Anoxic conditions

description

This paper analyses the valuable information provided by the on-line measurements of pH and oxidation reduction potential (ORP) in a continuous single high ammonia removal over nitrite (SHARON) reactor. A laboratory-scale SHARON reactor equipped with pH, ORP, electric conductivity and dissolved oxygen (DO) probes has been operated for more than one year. Nitrogen removal over nitrite has been achieved by adding methanol at the beginning of anoxic stages. Time evolution of pH and ORP along each cycle allows identifying the decrease in nitritation rate when ammonia is consumed during the aerobic phase and the end of the denitrification process during the anoxic phase. Therefore, monitoring pH and ORP can be used to develop a real-time control system aimed at optimizing the length of both aerobic and anoxic stages. Real-time control of methanol addition can be carried out by using the information provided by these probes: excessive methanol addition in the anoxic stage is clearly detected in the ORP profile of the following aerobic phase, while a deficit of methanol is detected in both pH and ORP profiles of that anoxic phase. Moreover, other valuable information such as the amount of ammonia nitrified, failures in DO measurements, excessive stirring during the anoxic stage and methanol dosage in the aerobic phase was also provided by the pH and ORP profiles. © IWA Publishing 2011.

year	journal	country	edition	language
2011-01-01

10.13039/501100003359 https://dx.doi.org/10.2166/wst.2011.478