PVA-PAA hydrogel micro-carrier for the improvement of phase separation efficiency of biomass in wastewater treatment

2021

Pollack

Sequencing batch reactor systems in wastewater treatment is widely applied activated sludge technology. The system performance is not only dependent on the raw sewage quality and biochemical processes, but the flow pattern within the reactor has a significant impact on the treatment itself. The varying stages of the operation require different fluid flow conditions; biological stage shall be appropriately mixed, whereas low velocity zones favor the phase separation. The aim of this study was to improve sequencing batch reactor operation in order to optimize the treatment efficiency. Numerical fluid dynamic simulations were performed to determine the substrate and biomass homogeneity inside the reactor at the biological phase and the rate of the decantation was estimated at the sedimentation phase. The settling model was calibrated by field measurements. The results revealed that the hydraulic efficiency of the reactor was 87% and the achievable settled solid content was 0.9%.

Section: Methodsmentioning

confidence: 99%

Operation improvement of sequencing FED-batch wastewater treatment

Bába

2021

Pollack

“…Pollack Periodica 13, 2018, 2 concentrations (0.5-2.0 mg/l) produces sludge with poorer settling characteristics compared to higher DO concentrations [1] and advanced settling techniques [2] shall be applied to achieve satisfactory level of phase separation.…”

Section: T Karchesmentioning

confidence: 99%

Effect of aeration on residence time in biological wastewater treatment

2018

Pollack Periodica

Aerobic wastewater treatment requires extensive aeration, which primary function is to provide oxygen to the biomass responsible for degradation of wastewater constituents. Besides the effective oxygen transfer efficiency aeration is responsible for fluid flow created by bubbles. In this research bubbles were released from plate diffusers and the impact on mixing were analyzed. Various aeration flow rates and initial bubble sizes were calculated. Residence time distributions in each scenario were compared applying numerical tracer study. Outcome of the calculations is that the aeration reduces the theoretical residence time significantly and therefore the traditional sizing methods needs to be revisit in wastewater treatment.

“…In individual wastewater treatment units all type of biomasses (suspended or attached) and hybrid methods could be applied [7], also the calculation of the operation parameters (aeration intensity, excess sludge removal) are the same as in large scale plants [8].…”

Section: Introductionmentioning

confidence: 99%

Sizing of a decentralized wastewater treatment unit supported by biokinetic modeling

Bába

2020

Pollack Periodica

Decentralized wastewater systems treat, dispose and reuse the wastewater in the vicinity of source, reducing the sewage transportation cost to minimal. As an alternative to centralized systems it can function as a satellite system or an individual wastewater treatment unit. Design an onsite facility applies the same sizing procedure compared the conventional large scale systems, whereas the input flow data and its variability, the model parameters could differ. In this study a small size treatment unit was designed by biokinetic modeling, where the model parameters were estimated using analytical methods. As a result of the calculation the biomass build-up and the quality of the treated effluent was predicted and the operation parameters were determined in summer and winter operation.