Effects of dissolved oxygen concentration on the performance of sponge membrane bioreactor treating hospital wastewater

Vo, Hoang Nhat Phong; Bui, Xuan‐Thanh; Nguyen, Hong-Hai; Tran, Thanh-Dai; Lee, Kwang-Jin; Nguyen, Thi-Thach-Thao; Dang, Bao‐Trong; Bui, Manh‐Ha; Nguyen, Dinh Duc; Ngo, Thi-Tra-My

doi:10.5004/dwt.2019.23828

Cited by 11 publications

(2 citation statements)

References 38 publications

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“…The average pH and temperature values were recorded to be 7.1 ± 0.3, 7.2 ± 0.4 and 7.4 ± 0.4 and 27.6 ± 0.9, 26.3 ± 0.9 and 27.7 ± 0.9 in the A 1 , O 1 and A 2 sections , respectively. The DO concentrations of more than 2 mg/L in the O 2 section were suitable for the nitrification processes to convert NH 4 -N to NO 2 -N and NO 3 -N by the nitrifiers which grow well in this condition [11,18,19]. Moreover, the DO concentrations less than 1.0 mg/L found in the A 1 and A 2 sections resulted in anoxic conditions which enabled for the occurrence of denitrification processes [20].…”

Section: Resultsmentioning

confidence: 99%

Performance and kinetic modeling of modified attached-growth anoxic-oxic-anoxic reactor for onsite sanitation system treating septic tank effluent

Koottatep

Kamngam

Chaiwong

2021

Environmental Engineering Research

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This paper investigated a combined process of a modified attached-growth anoxic-oxic-anoxic reactor (AG-AOAR) as a sustainable and effective post-treatment system for septic tank effluent was developed. The AG-AOAR was operated by varying hydraulic retention times (HRTs) from 24 to 72 h. The results showed that the AG-AOAR achieved highest removal efficiencies of 84, 66 and 91% of chemical oxygen demand (COD), total nitrogen (TN) and ammonium nitrogen (NH 4 -N), respectively, under the HRT of 72 h, resulting its effluent meeting the international and national discharge quality standards for non-sewered sanitation system. The Stover-Kincannon model was applicable to describe the kinetic constants of COD, TN, and NH 4 -N removal in the AG-AOAR (R 2 > 0.85). Accordingly, the maximum utilization rates (μ max ) were determined to be 41.1, 0.15 and 0.50 g/(L-d) for COD, TN and NH 4 -N removals, respectively, while the saturation constants (K B ) were 57.7, 0.12 and 0.51 g/(L-d), respectively. These constant values could be applied for the design of the AG-AOAR to produce treated effluent meeting desired standards.

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Section: Resultsmentioning

confidence: 99%

Performance and kinetic modeling of modified attached-growth anoxic-oxic-anoxic reactor for onsite sanitation system treating septic tank effluent

Koottatep

Kamngam

Chaiwong

2021

Environmental Engineering Research

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“…This is because the high aeration rate naturally will produce higher DO concentration which leads to the formation of bio flocculation in the sludge. This process requires the generated the extracellular polymetric substances (EPS) which the more COD will used as the substate [18]. This situation resulted the decline in COD value in higher aeration rate.…”

Section: The Efficiency Of Cod Removal On Different Aeration Ratementioning

confidence: 99%

Effect of Aeration Rate on Specific Oxygen Uptake Rate (SOUR) in Treating Chemical Oxygen Demand (COD) in Domestic Wastewater

Zubir,

Dahalan,

Kamarudin

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Specific oxygen uptake rate (SOUR) is significant parameter to determine the microbial activity and examined the effluent quality in biological wastewater treatment. Chemical oxygen demand (COD) is the major indicator in monitoring the effluent quality in relation on its removal mainly depends on the microbial activity in the activated sludge. So, this research is conducted to study the effect of aeration rate on SOUR and determined the best oxygen requirement in removing COD in domestic wastewater. The procedure was carried out by using domestic wastewater as the seed sludge in sequencing batch reactor. The reactor with working volume of 2L was operating 6 cycles in 24 hours with five phases (feeding, aeration, settle, draw and idle). The aeration time is fixed to 2.5 hours. The dissolved oxygen and COD readings were recorded with four types of aeration rate adjusted at 1L, 2L, 3L and 4L / min daily for 7 days. The result indicates that, 3L/min gives the highest SOUR which reflects that the high activity of microbial in this condition. Besides, the effluent also shows the highest COD removal efficiency on 3L/min of aeration rate. So, as a conclusion the best oxygen requirement for the microbial to carry out their activities on aeration rate of 3L/min.

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Membrane bioreactor processes

Nguyen

Chiemchaisri

Bui

et al. 2022

Current Developments in Biotechnology and Bioengineering

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Effects of dissolved oxygen concentration on the performance of sponge membrane bioreactor treating hospital wastewater

Cited by 11 publications

References 38 publications

Performance and kinetic modeling of modified attached-growth anoxic-oxic-anoxic reactor for onsite sanitation system treating septic tank effluent

Performance and kinetic modeling of modified attached-growth anoxic-oxic-anoxic reactor for onsite sanitation system treating septic tank effluent

Effect of Aeration Rate on Specific Oxygen Uptake Rate (SOUR) in Treating Chemical Oxygen Demand (COD) in Domestic Wastewater

Membrane bioreactor processes

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