TY  - BOOK
AU  - Gao,D.-W.
AU  - Peng,Y.-Z.
AU  - Liang,H.
AU  - Wang,P.
TI  - Using Oxidation-Reduction Potential (ORP)and pH Value for Process Control of Shortcut Nitrification-Denitrification
KW  - CARBON
KW  - CHEMICAL OXYGEN DEMAND
KW  - CHEMICAL REACTORS
KW  - DENITRIFICATION
KW  - MIXING
KW  - NITRIFICATION
KW  - NITROGEN
KW  - OXIDATION
KW  - PH EFFECTS
KW  - PROCESS CONTROL
KW  - REAL TIME SYSTEMS
KW  - REDUCTION
N2  - A new low cost technology for simultaneous carbon-nitrogen removal from soybean wastewater has been developed in this study. The technology is performed through shortcut nitrification-denitrification. The process operated under real-time control of aeration and mixing time. The shortcut nitrification-denitrification in sequencing batch reactor (SBR)was achieved efficiently and steadily by controlling temperature (28 ± 0.5°C)and using real-time control strategies. This enabled the prevention of nitrite oxidation, leading to lower operational costs. The feasibility of oxidation-reduction potential (ORP)and pH value as control parameter for shortcut nitrification-denitrification process was also investigated. Results showed that the average removal efficiency of ammonium was more than 95 percent, and nitrosation rate (NO2 -N/NOx --N)was reached to 96 percent. At the same time, the variation of oxidation-reduction potential (ORP)and pH value was well related to organic matter degradation and ammonium oxidation in SBR. So that judgment on the ending of nitrification and denitrification can be based on the inflection point on the varied curve of ORP and pHthroughout each SBR processing cycle, and thus reducing aeration and mixing time for saving energy source. The method saves organic energy up to 40 percent of chemical oxygen demand (COD)in denitrification process, which should reduce the need for an extra external source of organic carbon. Shorter hydraulic retention time should allow the volume of the reactors to diminish, and thus diminish investment costs. Lower oxygen demand of about 25 percent gives lower exploitation costs
UR  - https://drive.google.com/file/d/144SLuo6H15ztRuHYiGPHSrLIHfW1ylEY/view?usp=drivesdk
ER  -