Performance of a pilot-scale sewage treatment: An up-flow anaerobic sludge blanket (UASB) and a down-flow hanging sponge (DHS) reactors combined system by sulfur-redox reaction process under low-temperature conditions

Takahashi, Masanobu; Yamaguchi, Takashi; Kuramoto, Yoshiharu; Nagano, Akihiro; Shimozaki, Satoshi; Sumino, Haruhiko; Araki, Nobuo; Yamazaki, Shinichi; Kawakami, S.; Harada, Hideki

doi:10.1016/j.biortech.2010.08.081

Cited by 36 publications

(12 citation statements)

References 16 publications

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“…In these series of studies for treatment of municipal sewage under low-temperature conditions, a wastewater treatment system consisting of a UASB and down-flow hanging sponge (DHS) reactor with a sulfur-redox reaction was developed. Previous studies showed that the sulfur-redox UASB-DHS system is applicable for low-strength wastewater treatment under low-temperature conditions such as below 10ºC with over 90% biochemical oxygen demand (BOD) removal (3,5).…”

Section: Introductionmentioning

confidence: 99%

Molecular characterization of anaerobic sulfur-oxidizing microbial communities in up-flow anaerobic sludge blanket reactor treating municipal sewage

Aida

Hatamoto

Yamamoto

et al. 2014

Journal of Bioscience and Bioengineering

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A novel wastewater treatment system consisting of an up-flow anaerobic sludge blanket (UASB) reactor and a down-flow hanging sponge (DHS) reactor with sulfur-redox reaction was developed for treatment of municipal sewage under low-temperature conditions. In the UASB reactor, a novel phenomenon of anaerobic sulfur oxidation occurred in the absence of oxygen, nitrite and nitrate as electron acceptors. The microorganisms involved in anaerobic sulfur oxidation have not been elucidated. Therefore, in this study, we studied the microbial communities existing in the UASB reactor that probably enhanced anaerobic sulfur oxidation. Sludge samples collected from the UASB reactor before and after sulfur oxidation were used for cloning and terminal restriction fragment length polymorphism (T-RFLP) analysis of the 16S rRNA genes of the bacterial and archaeal domains. The microbial community structures of bacteria and archaea indicated that the genus Smithella and uncultured bacteria within the phylum Caldiserica were the dominant bacteria groups. Methanosaeta spp. was the dominant group of the domain archaea. The T-RFLP analysis, which was consistent with the cloning results, also yielded characteristic fingerprints for bacterial communities, whereas the archaeal community structure yielded stable microbial community. From these results, it can be presumed that these major bacteria groups, genus Smithella and uncultured bacteria within the phylum Caldiserica, probably play an important role in sulfur oxidation in UASB reactors.

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Section: Introductionmentioning

confidence: 99%

Molecular characterization of anaerobic sulfur-oxidizing microbial communities in up-flow anaerobic sludge blanket reactor treating municipal sewage

Aida

Hatamoto

Yamamoto

et al. 2014

Journal of Bioscience and Bioengineering

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“…But still, good organic removal even at low temperature in UASB-DHS was achieved. This could be attributed to the existence of sulfate-reducing bacteria capable of decomposing organic matter in UASB (Takahashi et al, 2011) and also large amount of active biomass retained in DHS sponges (Tandukar et al, 2006). Furthermore, unlike other aerobic systems, DHS possesses a well-pronounced advantage i.e.…”

Section: Results and Discussion Performance Of Reactor For Organic Rementioning

confidence: 99%

“…In this advent, upflow anaerobic sludge blanket (UASB) has been proven to be effective for medium to high strength wastewater in tropical zones, subtropical zones and also in low ambient temperature (Takahashi et al, 2011). However, studies revealed that UASB alone is incapable of treating the wastewater efficiently, thus, there is a need for further treatment (Foresti et al, 2006;Moawad et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

An Integrated System of UASB-DHS-A2SBR for Effective Removal of Organic Matter and Nutrients from Municipal Wastewater

Maharjan

Dehama

Ohtsuki

et al. 2014

J. of Wat. ^|^ Envir. Tech.

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In order to fulfill the imperative need of proper organic matter and nutrient removal technology, an integrated system of up-flow anaerobic sludge blanket (UASB), down-flow hanging sponge (DHS) and anaerobic/anoxic sequencing batch reactor (A 2 SBR) is developed in this study. An aerobic reactor called DHS has porous sponge material for oxygen supply and microbes retention. Likewise, A 2 SBR is reported to remove nutrients, like phosphorus and nitrogen, effectively using denitrifying phosphorus accumulating organisms (DNPAOs) with less sludge production. The findings of this study demonstrated that the average SS, COD and BOD removal efficiencies by UASB-DHS were 86%, 87% and 97%, respectively, in summer and were 69%, 78% and 88%, respectively, in winter. Moreover, upon adjusting the pH to 7.4 ± 0.2 and with COD/P of 20, phosphate removals as low as 1 mg-P/L and nitrate concentration as low as 5 mg-N/L were achieved. Therefore, this proposed system could be an innovative solution for the present prevalent municipal wastewater treatment problems due to its effective organic and nutrient removal capabilities.

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“…The redox value, oxidation‐reduction potential (ORP), is commonly used as a monitoring parameter in anaerobic treatment processes, e.g. in upflow anaerobic sludge blanket (UASB) reactors and anaerobic digesters ORP has also been used to monitor nitrification and denitrification processes. Nitrification and denitrification are known to be closely associated with the change of ORP and pH .…”

Section: Introductionmentioning

confidence: 99%

Oxidation-reduction potential (ORP) as a control parameter in a single-stage partial nitritation/anammox process treating reject water

Yang

Trela

Płaza

et al. 2015

J. Chem. Technol. Biotechnol.

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BACKGROUND: Redox potential value (or pE) can be used as a monitoring parameter for deammonification processes treating reject water. In this study its use as a control parameter was investigated. Experiments were carried out with a one-stage partial nitritation/anammox process in a 200 L moving bed biofilm reactor (MBBR) with 40% filled Kaldnes biofilm carriers. RESULTS:Tests on different combinations of nitrogen loads (1.8-3.3 gN m −2 d −1 ) and pE values (−1, 0, 1) revealed that process performance was stable and nitrogen removal efficiency >80% was achieved at all tested pE values except pE= − 1. A value close to pE=0 was the most suitable in terms of process performance at 25 ∘ C at all tested pE values. With a fixed redox potential value (pE=0) used in the system, the air supply adjusted automatically under different nitrogen loads and maintained a high nitrogen removal efficiency. Theoretical calculations showed that pE >0.15 (at pH=7) provides conditions for nitrite conversion into nitrate at 25 ∘ C. CONCLUSION: Redox control turned out to be a suitable control parameter for operation of a partial nitritation/anammox process. A redox value of 0 was a suitable value under different nitrogen loads in this pilot-scale study.

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Performance of a pilot-scale sewage treatment: An up-flow anaerobic sludge blanket (UASB) and a down-flow hanging sponge (DHS) reactors combined system by sulfur-redox reaction process under low-temperature conditions

Cited by 36 publications

References 16 publications

Molecular characterization of anaerobic sulfur-oxidizing microbial communities in up-flow anaerobic sludge blanket reactor treating municipal sewage

Molecular characterization of anaerobic sulfur-oxidizing microbial communities in up-flow anaerobic sludge blanket reactor treating municipal sewage

An Integrated System of UASB-DHS-A2SBR for Effective Removal of Organic Matter and Nutrients from Municipal Wastewater

Oxidation-reduction potential (ORP) as a control parameter in a single-stage partial nitritation/anammox process treating reject water

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