Real-time control of oxic phase using pH (mV)-time profile in swine wastewater treatment

Ga, Cornand; Ra, Chang‐Six

doi:10.1016/j.jhazmat.2009.06.133

Cited by 23 publications

(16 citation statements)

References 27 publications

(39 reference statements)

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“…9 that the pH profiles for each NLR studied present behavior tendencies similar to previous studies done in SND systems and reported in the literature (Ga and Ra 2009;Guo et al 2009;Li et al 2007;Wang et al 2008). With respect to the ORP behavior, increments of this parameter were observed during the anoxic stage, eventually identifying the points where there only existed carbon oxidation (RCMP), and subsequently, the ORP profile drops slowly during the aerobic stage after the elimination of accumulated nitrates.…”

Section: Behavior Profiles Of Ph/orpsupporting

confidence: 86%

Simultaneous nitrification–denitrification of wastewater: effect of zeolite as a support in sequential batch reactor with step-feed strategy

Guerrero

Montalvo

Huiliñir

et al. 2016

Int. J. Environ. Sci. Technol.

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One of the technologies used for wastewater nitrogen removal consists in simultaneous nitrificationdenitrification. The low microbial growth rate and the low availability of organic material for the denitrification stage make it necessary to study new operational conditions and the use of microbial supports. The aim of this study was to evaluate the operational behavior of a simultaneous nitrification-denitrification process in a sequential batch reactor utilizing zeolite as a biomass support and step-feed strategy. Two reactors of 2 L were used, one with zeolite and another without zeolite, both operated at constant temperature (31°C), varying nitrogen loading rate (NLR) from 0.041 to 0.113 kg total Kjeldahl nitrogen (TKN/m 3 /day). After 209 days, removals higher than 86 and 96 % in nitrogen compounds and organic matter were obtained, respectively. There was not accumulation of nitrate and nitrite in any case; this means that there was a simultaneous nitrification-denitrification in the reactors. The incorporation of zeolite in the system held higher concentration of biomass in the reactor; this led to reduce start-up to 21 days and to improve 11.31 % removal kinetic. The use of a stepfeed strategy prevents events of inhibition by substrate, even duplicating tolerance to higher NLR for the same operation time.

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Section: Behavior Profiles Of Ph/orpsupporting

confidence: 86%

Simultaneous nitrification–denitrification of wastewater: effect of zeolite as a support in sequential batch reactor with step-feed strategy

Guerrero

Montalvo

Huiliñir

et al. 2016

Int. J. Environ. Sci. Technol.

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“…Average values of the operational conditions for the three case studies shown in Figure 5, Figure 6 and Figure 7. Influent Effluent TSS mg l -1 128±31 23±5 VSS mg l -1 104±34 14±3 TCOD mgCOD l -1 406±92 45±8 SCOD mgCOD l -1 228±41 39±6 TBOD mgCOD l SSV (mg·l -1 ) T (ºC) NH4-Ninfl (mg·l -1 ) Figure 5 1500 20 40.0 Figure 6 [400-1520] [23][24][25][26] 40.0 Figure 7 [1200-1572] [23][24][25][26] 110.0 Figure 1. Flow diagram of the UCT pilot plant where the control system has been developed.…”

Section: Discussionmentioning

confidence: 99%

“…During the last decade, many researchers have considered the use of oxidation-reduction potential (ORP), pH, and dissolved oxygen (DO) for monitoring and controlling the biological nitrogen removal processes. Specifically, these sensors have been widely applied to control the nitrogen removal process in sequencing batch reactors and intermittently aerated continuous systems [18][19][20][21][22][23][24][25][26]. These control strategies are based on the so-called bending points of the ORP and pH profiles.…”

Section: Introductionmentioning

confidence: 99%

An advanced control strategy for biological nutrient removal in continuous systems based on pH and ORP sensors

Ruano

Ribes

Seco

et al. 2012

Chemical Engineering Journal

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Ruano, MV.; Seco Torrecillas, A.; Ferrer, J. (2012). An advanced control strategy for biological nutrient removal in continuous systems based on pH and ORP sensors. Chemical Engineering Journal. 183:212-221. https://doi. AbstractA fuzzy logic-based control system that uses low-cost sensors for controlling and optimizing the biological nitrogen removal in continuous systems has been developed. The novelty of this control system is the use of several pH, ORP, and dissolved oxygen (DO) sensors instead of on-line nitrogen sensors/analyzers. The nitrogen control system was developed and implemented in a UCT pilot plant fed with wastewater from a full-scale plant. The developed nitrification controller allows the effluent ammonium concentration to be maintained below the effluent criteria discharge with the minimum energy consumption. The denitrification process controller allows the energy consumption derived from pumping to be minimized, as the control system only increases the internal recycle flow rate when the anoxic reactor reveals further capacity for denitrification. This advanced control strategy offers an attractive alternative to on-line, nitrogen analyzer-based control systems since it involves lower investment, maintenance, and operational costs that are derived from the instrumentation.

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“…The ORP and DO levels can successfully indicate the oxidative and biological state of the wastewater, and pH is a good indicator of ongoing biological reactions [9,10] . However, the usefulness of the information provided by those bending points is site-dependent [11] .…”

Section: Introductionmentioning

confidence: 99%

Performance and Real-time Control of a Novel SBR Based on Simulating Photovoltaic Aeration for Organics Removal

Ma¹,

Zhou²

2016

Proceedings of the 2016 International Conference on Mechatronics, Control and Automation Engineering

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A novel SBR based on simulating photovoltaic aeration for organics removal was established for rural sewage treatment. Short-term effects of aeration rate and temperature on soluble chemical oxygen demand (SCOD), ammonium (NH4 + -N) and dissolved total phosphorous (DTP) removal processes were investigated, and suitable real-time control parameters for organics removal process were selected. The results showed that organic removal process can be divided into the rapid degradation stage and the recalcitrant degradation stage. In the organic matter rapid degradation stage, when temperature was constant (25°C), the increase in aeration rate resulted in a positive impact upon the SCOD decrease rate and the amount of NH4 + -N assimilated by heterotrophic bacteria. The slope changes in DO profiles (dDO/dt) were found to better represent the organic degradation process, which could be used for real-time control of the organics removal process after smoothing.

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Real-time control of oxic phase using pH (mV)-time profile in swine wastewater treatment

Cited by 23 publications

References 27 publications

Simultaneous nitrification–denitrification of wastewater: effect of zeolite as a support in sequential batch reactor with step-feed strategy

Simultaneous nitrification–denitrification of wastewater: effect of zeolite as a support in sequential batch reactor with step-feed strategy

An advanced control strategy for biological nutrient removal in continuous systems based on pH and ORP sensors

Performance and Real-time Control of a Novel SBR Based on Simulating Photovoltaic Aeration for Organics Removal

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