New contributions to the ORP &amp; DO time profile characterization to improve biological nutrient removal

Vega, Pedro T. Martín de la; Salazar, Enrique Martínez de; Jaramillo, M.A.; Cros, J.

doi:10.1016/j.biortech.2012.03.039

Cited by 35 publications

(6 citation statements)

References 15 publications

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“…The number of cycles for NKP detection by ORP msc only, both (ORP msc and ORP abs ), and ORP abs only was 291 (56 days), 132 (16 days), and 53 cycles (7 days), respectively. The detection of NKP is normally associated with denitrification, which highly depends on the availability of organic matter [ 23 , 24 , 25 ]. As no external carbon source was used to enhance the denitrification, the difference in the number of cycles per day depended on a number of factors, such as organic matter availability, microorganism activities, and other environmental factors [ 12 , 23 ].…”

Section: Resultsmentioning

confidence: 99%

Real-Time Control Technology for a Bio-Liquor Circulation System in a Swine Barn with Slurry Pit: Pilot Scale Study

Kim

Shim

Won

et al. 2022

Animals

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The livestock industry, especially swine production, has been pressurized by vicinity complaints about odor in Korea. Therefore, a lot of effort has been undertaken regarding reducing the odor emissions from pigsties, widely carried out and the washing out manure in slurry pit by liquid-phase compost has particularly been spotlighted with outstanding performance of odor reduction. However, such a washing out manure called bio-liquor circulation system (BCS) has been controlled by a timer with designated reaction time, which cannot guarantee the system performance. This research proposes an effective real-time control technology for BCS, which circulates bio-liquor to the slurry pit of swine barns. The real-time control system was operated through accurate detection of the designated control points on the oxidation reduction potential (ORP) and pH time profiles for the nitrate knee point (NKP) and nitrogen break point (NBP) in anoxic and aerobic conditions with 100 and 99.6% performances, respectively. The duration of the anoxic and aerobic phases was also automated and noticeably lowered the concentration of nutrients in the manure in the slurry-pit, which served as a source of malodor. The real-time control strategy may be an innovative way to reduce odor and simultaneously produce liquid fertilizer, and provides a reference for the optimization of the industrial scale.

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Section: Resultsmentioning

confidence: 99%

Real-Time Control Technology for a Bio-Liquor Circulation System in a Swine Barn with Slurry Pit: Pilot Scale Study

Kim

Shim

Won

et al. 2022

Animals

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“…The decomposition of these pollutants often consumes oxygen, resulting in a reduction of the oxidation-reduction potential (ORP). Hence, the eutrophication index and ORP often display an inverse relationship (Martín et al 2012). However, when ORP increases, it may also indicate the presence of other oxidizing pollutants entering the water or the release of pre-existing oxidizing pollutants from sediment, leading to new water pollution.…”

Section: Neural Network Analysismentioning

confidence: 99%

The eutrophication-related index of drinking water sources based on the oxidation-reduction potential

Zhang,

Zhu,

Liu

et al. 2024

BioRes

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Eutrophication caused by excessive nitrogen and phosphorus is an important factor affecting water quality in drinking water sources. Convenient monitoring of eutrophication in water bodies can reduce the use of pesticides and reduce energy consumption, helping to promote ecological and economic development. This study examined the relationship between water eutrophication and the oxidation-reduction potential (ORP). The results showed that various parameters related to eutrophication, such as ammonia nitrogen, total nitrogen, total phosphorus, chlorophyll-a, and cyanobacteria, had correlations with ORP. There is a close relationship between eutrophication and the concentration of cyanobacteria. When cyanobacteria blooms occur in the drinking water source, it may contaminate the drinking water. Because the conventional eutrophication index does not include the concentration of cyanobacteria, principal component analysis (PCA) was utilized to comprehensively analyze these eutrophication-related parameters and obtain the eutrophication-related index, with the cumulative contribution of principal components reaching 81.8%. Different mathematical methods such as neural network model and mathematical fitting were used to study the relationship between ORP and the eutrophication-related index. A three-segment relationship between the ORP and the index was established. This three-stage relationship was confirmed in different reservoirs.

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“…For complex and time-varying processes, this form of control would result in an excess of aeration to guarantee the process performance or in legal violations due to failures in nitrogen removal. In addition, since the system did not have ammonium/nitrate measurement probes, the response to any type of deviation was postponed until a laboratory result was obtained [18][19][20].…”

Section: Initial Operating Conditions Of the Control Systems Regulatimentioning

confidence: 99%

Methodology for Energy Optimization in Wastewater Treatment Plants. Phase III: Implementation of an Integral Control System for the Aeration Stage in the Biological Process of Activated Sludge and the Membrane Biological Reactor

Avilés¹,

Velázquez

Riquelme

2020

Sensors

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The proposed methodology for optimizing energy efficiency, based on good management of the aeration process through the implementation of an appropriate control strategy, achieved reductions of more than 40% in energy consumption at the San Pedro del Pinatar Wastewater Treatment Plant (WWTP) (Murcia, Spain). Phases I and II of this methodology managed to reduce the oxygen needs of the microorganisms in the biological system, optimize the efficiency of oxygen transfer to the biological reactor and redesign the installation to correct abnormal energy loss situations. In addition, we established the basis for Phase III, which implemented a control strategy to achieve stable values close to the setpoints of the fundamental operating parameters of the aeration process. The control system is based on the measurements recorded by strategically installed sensors and mathematical algorithms based on models, achieving an expert adaptive-predictive system that regulates aeration both in the biological stage by activated sludge and the aeration of the installed ultrafiltration membrane system. The objectives were: (i) to achieve automatic execution of the best management strategy; (ii) to reduce the energy demand; (iii) to improve the operation and stability of the process; (iv) to reduce operating costs; and (v) to contribute to the fulfillment of the sustainable development objectives.

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New contributions to the ORP & DO time profile characterization to improve biological nutrient removal

Cited by 35 publications

References 15 publications

Real-Time Control Technology for a Bio-Liquor Circulation System in a Swine Barn with Slurry Pit: Pilot Scale Study

Real-Time Control Technology for a Bio-Liquor Circulation System in a Swine Barn with Slurry Pit: Pilot Scale Study

The eutrophication-related index of drinking water sources based on the oxidation-reduction potential

Methodology for Energy Optimization in Wastewater Treatment Plants. Phase III: Implementation of an Integral Control System for the Aeration Stage in the Biological Process of Activated Sludge and the Membrane Biological Reactor

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