Activated sludge process diagnosis using advanced real-time monitoring equipment: activated sludge plant controller (ASP-CON)

Kim, Jong Kyu; Dooley, Michael P.; Lee, Min Hee; Lee, Jae Mee

doi:10.1007/s12665-019-8444-4

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The literature review has not shown research publication about applicability of (OUR) for management of onsite WWTPs, but has shown experience and knowledge with municipal WWTPs. Similar to our idea for use of (OUR) as a tool for energy optimization of IAS was reported by Kim et al [11] for a municipal WWTP. Their results proved that measuring (OUR) together with DO and ammonium nitrogen enables more effective operation due to significant energy savings from less supplied oxygen.…”

Section: Introductionsupporting

confidence: 66%

Towards Energy Efficient Onsite Wastewater Treatment

et al. 2020

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The objective of this work is to demonstrate that some weaknesses of the onsite packaged WWTP associated with high operational costs and energy inefficiency could be overcome by improved management. The research methodology consists of series of batch studies with sludge from municipal or onsite WWTP, which simulate different working regimes of the onsite WWTPs – daily operation, toilet flushing and dishwasher machine. A simple classical tool, Oxygen Uptake Rate (OUR) is used to prove the hypothesis that regardless the specificity of the onsite WWTPs, namely the irregularity of the flow and load, three parameters follow similar increasing and decreasing trends – inflow rate, inflow pollution load and oxygen demand in the reactor. The literature review has not shown research publication about applicability of (OUR) for management of onsite WWTPs, but has shown experience and knowledge with municipal WWTPs, which were utilized in our study. The results prove that when there is no wastewater generation in the household, the (OUR) in the reactor is very low, 0.0007 to 0.0015 mg/l.s, thus do not require high oxygen supply. However, when wastewater flushes into the onsite WWTP, the oxygen demand increases rapidly and (OUR) reaches the range of 0.0040 to 0.0063 mg/l.s depending on the type and the quantity of the incoming substrate (pollution load). These results, if verified in filed experiments will enable optimization of the energy use during onsite WWTP operation. The suggestion is that the oxygen supply in the reactor should be adjusted according to the demand, respectively proportional to the inflow rate. In addition to the benefit of saving energy, the comprehensive sensors for dissolved oxygen monitoring, which require qualified maintenance could be avoided and replaced by simple sensors for level, which are anyway part of the equipment of most of the onsite packaged WWTP.

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Section: Introductionsupporting

confidence: 66%

Towards Energy Efficient Onsite Wastewater Treatment

et al. 2020

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“…Probes were maintained on every 12 to 24 h to maintain reliable data collection. Future work will need to look at online OUR measurement probes with improved self‐cleaning and calibration (Kim et al, 2019) or alternative ways of measuring the bioflocculation boundaries or OUR. This could include calculation of OUR in situ, based on applied airflow rates, or by applying intermittent aeration.…”

Section: Resultsmentioning

confidence: 99%

Introducing bioflocculation boundaries in process control to enhance effluent quality of high‐rate contact‐stabilization systems

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Winckel

et al. 2022

Water Environment Research

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High‐rate activated sludge (HRAS) systems suffer from high variability of effluent quality, clarifier performance, and carbon capture. This study proposed a novel control approach using bioflocculation boundaries for wasting control strategy to enhance effluent quality and stability while still meeting carbon capture goals. The bioflocculation boundaries were developed based on the oxygen uptake rate (OUR) ratio between contactor and stabilizer (feast/famine) in a high‐rate contact stabilization (CS) system and this OUR ratio was used to manipulate the wasting setpoint. Increased oxidation of carbon or decreased wasting was applied when OUR ratio was <0.52 or >0.95 to overcome bioflocculation limitation and maintain effluent quality. When no bioflocculation limitations (OUR ratio within 0.52–0.95) were detected, carbon capture was maximized. The proposed control concept was shown for a fully automated OUR‐based control system as well as for a simplified version based on direct waste flow control. For both cases, significant improvements in effluent suspended solids level and stability (<50‐mg TSS/L), solids capture over the clarifier (>90%), and COD capture (median of 32%) were achieved. This study shows how one can overcome the process instability of current HRAS systems and provide a path to achieve more reliable outcomes. Practitioner points Online bioflocculation boundaries (upper and lower limit) were defined by the OUR ratio between contactor and stabilizer (feast/famine). To maintain effluent quality, carbon oxidation was minimized when bioflocculation was not limited (0.52–0.95 OUR ratio) and increased otherwise. A fully automated control concept was piloted, also a more simplified semiautomated option was proposed. Wasting control strategies with bioflocculation boundaries improved effluent quality while meeting carbon capture goals. Bioflocculation boundaries are easily applied to current wasting control schemes applied to HRAS systems (i.e., MLSS, SRT, and OUR controls).

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Activated sludge process diagnosis using advanced real-time monitoring equipment: activated sludge plant controller (ASP-CON)

Cited by 2 publications

References 11 publications

Towards Energy Efficient Onsite Wastewater Treatment

Towards Energy Efficient Onsite Wastewater Treatment

Introducing bioflocculation boundaries in process control to enhance effluent quality of high‐rate contact‐stabilization systems

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