Removal of nitrogenous and carbonaceous substances by a porous carrier–membrane hybrid process for wastewater treatment

Jun, Byong-Hee; Miyanaga, Kazuhiko; Tanji, Yasunori; Unno, Hajime

doi:10.1016/s1369-703x(02)00119-5

Cited by 36 publications

(15 citation statements)

References 32 publications

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“…Therefore, at the same amount of acetate addition, the efficiency of reactor C was lower than reactor B. The coexistence of other heterotrophic bacteria in the immobilised NH 4 -N removal system is reported by other studies as well( Jun et al 2003).In reactor A, a high DO concentration is a major reason for its lower performance because a bulk DO concentration of 5 -6 mg/L induces a small anoxic zone and high competition of other heterotrophic bacteria for acetate consumption. Successful operation of a highly efficient reactor under continuous aeration period byNakano et al (2004) at lower DO concentration range of 0.5-2.0 mg/L supports our reasoning.…”

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confidence: 59%

Performance of intermittent aeration reactor on NH4-N removal from groundwater resources

Khanitchaidecha

Nakamura

Sumino

et al. 2010

Water Science and Technology

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To study the effect of intermittent aeration period on ammonium-nitrogen (NH4-N) removal from groundwater resources, synthetic groundwater was prepared and three reactors were operated under different conditions--"reactor A" under continuous aeration, "reactor B" under 6 h intermittent aeration, and "reactor C" under 2 h intermittent aeration. To facilitate denitrification simultaneously with nitrification, "acetate" was added as an external carbon source with step-wise increase from 0.5 to 1.5 C/N ratio, where C stands for total carbon content in the system, and N for NH4-N concentration in the synthetic groundwater. Results show that complete NH4-N removal was obtained in "reactor B" and "reactor C" at 1.3 and 1.5 C/N ratio respectively; and partial NH4-N removal in "reactor A". These results suggest that intermittent aeration at longer interval could enhance the reactor performance on NH4-N removal in terms of efficiency and low external carbon requirement. Because of consumption of internal carbon by the process, less amount of external carbon is required. Further increase in carbon in a form of acetate (1.5 to 2.5 C/N ratios) increases removal rate (represented by reaction rate coefficient (k) of kinetic equation) as well as occurrence of free cells. It suggests that the operating condition at reactor B with 1.3 C/N ratio is more appropriate for long-term operation at a pilot-scale.

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confidence: 59%

Performance of intermittent aeration reactor on NH4-N removal from groundwater resources

Khanitchaidecha

Nakamura

Sumino

et al. 2010

Water Science and Technology

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“…BIOSEP plant was developed to have organic degradation, nitrification, denitrification and filtration in one tank in which intermittent aeration provides both aerobic and anoxic phases (Yeom et al 1999). Jun et al (2003) proposed a hybrid system that consists of suspended porous carriers and membrane for removal of nitrogen together with carbonaceous substances. An aerated MBR has been be incorporated with a separated anoxic tank to form a continuous-flow treatment process for nitrification and denitrification (Kraume et al 2005).…”

Section: Introductionmentioning

confidence: 99%

A membrane bioreactor for an innovative biological nitrogen removal process

Chen

Sun²,

Wang³

et al. 2010

Water Science and Technology

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A hybrid system has been developed for biological nitrogen removal through nitrification-denitrification. The system includes an aerobic tank and an anoxic tank with an intermediate sludge settler connected to a membrane bioreactor (MBR) with a submerged 0.4 microm hollow-fiber membrane module. The laboratory system has a total working volume of 6.5 L treating a glucose-based synthetic wastewater. The experimental results demonstrate that the new process is highly effective for simultaneous organic and nitrogen removal. During the stationary operation, a sludge SS (suspended solids) concentration of 6 g/L or higher can be maintained in the reactors. The system has a COD (chemical oxygen demand) loading rate of up to 2,100 mg/L-d and a total nitrogen loading rate of up to 170 mg N/L-d. More than 95% COD can be degraded, and the total nitrogen removal efficiency can be 90% or higher as the nitrogen is reduced from 100 to around 7.5 mg/L. A high quality effluent is produced with a SS of less than 1 mg/L. With the MBR, organic degradation, nitrogen removal and sludge-liquid separation can be well achieved within a short HRT of about 10 hr.

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“…Recent studies have shown that simultaneous nitrification and denitrification (SND) can occur under aerobic conditions in many moving bed biofilm wastewater treatment systems [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous C and N Removal in a Hybrid CAST Reactor

Bian

Guo

Zhang

2009

2009 3rd International Conference on Bioinformatics and Biomedical Engineering

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Cyclic Activated Sludge Technology (CAST) is one of the variations of SBR processes. In this experiment, suspended media were introduced into the CAST reactor to increase the quantity of microorganism and micro anoxic environment. Simultaneous carbon and nitrogen removal performance of the hybrid CAST reactor was investigated. The experiment results demonstrated that more than 96% COD and 98% TN removal were achieved when the influent COD was 4686-5781 mg/L and TN was 180 mg/L, the removal rate of COD and TN reached to 3.05-3.77 kgCOD/(m3.d) and 0.12 kgTN/(m3.d) respectively. Nitrogen track studies indicated that TN was mainly removed though SND mechanism with nitrite as the intermittent product. The occurrence of SND during the aeration period was resulted from the existence of micro anoxic environment in the suspended carriers of the reactor.

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Removal of nitrogenous and carbonaceous substances by a porous carrier–membrane hybrid process for wastewater treatment

Cited by 36 publications

References 32 publications

Performance of intermittent aeration reactor on NH4-N removal from groundwater resources

Performance of intermittent aeration reactor on NH4-N removal from groundwater resources

A membrane bioreactor for an innovative biological nitrogen removal process

Simultaneous C and N Removal in a Hybrid CAST Reactor

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