Oxygen transfer dynamics and nitrification in a novel rotational sponge reactor

Hewawasam, Choolaka; Matsuura, Norihisa; Maharjan, Namita; Hatamoto, Masashi; Yamaguchi, Takashi

doi:10.1016/j.bej.2017.09.021

Cited by 26 publications

(6 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most abundant phyla found in the biofilm are Proteobacteria and Bacteroidetes, accounting for two-thirds of the microbial community. The oxygen-rich outer layer of the biofilm contains more Proteobacteria, Bacteroidetes, and Nitrospira than the inner layer [37]. The AOB and NOB are found both in the inner and outer layers of the biofilm.…”

Section: Biological Performancementioning

confidence: 99%

Membrane Filtration as Post-Treatment of Rotating Biological Contactor for Wastewater Treatment

et al. 2021

View full text Add to dashboard Cite

A rotating biological contactor (RBC) offers a low energy footprint but suffers from performance instability, making it less popular for domestic wastewater treatment. This paper presents a study on an RBC integrated with membrane technology in which membrane filtration was used as a post-treatment step (RBC–ME) to achieve enhanced biological performance. The RBC and RBC–ME systems were operated under different hydraulic retention times (HRTs) of 12, 18, 24, and 48 h, and the effects of HRT on biological performance and effluent filterability were assessed. The results show that RBC–ME demonstrates superior biological performance than the standalone RBC. The RBC–ME bioreactor achieved 87.9 ± 3.2% of chemical oxygen demand (COD), 98.9 ± 1.1% ammonium, 45.2 ± 0.7% total nitrogen (TN), and 97.9 ± 0.1% turbidity removals. A comparison of the HRTs showed that COD and TN removal efficiency was the highest at 48 h, with 92.4 ± 2.4% and 48.6 ± 1.3% removal efficiencies, respectively. The longer HRTs also lead to better RBC effluent filterability. The steady-state permeability increased respectively by 2.4%, 9.5%, and 19.1% at HRTs of 18, 24, and 48 h, compared to 12 h. Our analysis of membrane fouling shows that fouling resistance decreased at higher HRTs. Overall, RBC–ME offered a promising alternative for traditional suspended growth processes with higher microbial activity and enhanced biological performance, which is in line with the requirements of sustainable development and environment-friendly treatment.

show abstract

Section: Biological Performancementioning

confidence: 99%

Membrane Filtration as Post-Treatment of Rotating Biological Contactor for Wastewater Treatment

et al. 2021

View full text Add to dashboard Cite

show abstract

“…For almost two decades, DHS system was researched as the post treatment of UASB for domestic wastewater and implementation of its full-scale have justified it [15][16][17][18]. Modifications to DHS systems are mainly conducted to eliminate the shortcoming of reactor and improve the nutrient and pathogen removal efficiencies [19,20]. At early stages, DHS reactor was developed to treat domestic wastewater, however the potential of DHS reactor for treating different types of wastewater such as aquaculture [21], industrial wastewater [22][23][24] (textile, arsenic, rubber processing etc.)…”

Section: Downflow Hanging Sponge Systemmentioning

confidence: 99%

“…Right from the first prototype of UASB+DHS system, its treatment efficiency for organic, nitrogen and pathogen have shown impressive results for domestic wastewater treatment [10,[12][13][14][15][16][17][18][19][20]. There are plethora of studies reporting the treatment performance of UASB+DHS system.…”

Section: Treatment Performancementioning

confidence: 99%

Downflow Hanging Sponge System: A Self-Sustaining Option for Wastewater Treatment

Maharjan¹,

Hewawasam²,

Hatamoto³

et al. 2021

Promising Techniques for Wastewater Treatment and Water Quality Assessment

Self Cite

View full text Add to dashboard Cite

Need of self-sustaining wastewater treatment plants (WWTPs) has become critical to cope up with dynamics of the environmental regulations and rapid advancements in the contemporary technologies. At present there are limited number of self-sustaining WWTPs around the world. The aim of this chapter is to present state -of- art of Downflow Hanging Sponge (DHS) system which was developed as a post treatment unit of Upflow Anaerobic Sludge Blanket (UASB) from sustainability perspective. DHS system is a non-submerged fixed bed trickling filter (TF) that employs a core technology of polyurethane sponges as a media where the microorganisms thrive and major treatment processes take place. This chapter reviews the introduction of DHS system (UASB+DHS) summarizes the quantitative analysis of environmental, economic and social sustainability using indicators. Furthermore, self-sustaining prospects of DHS system are assessed and discussed by comparing with conventional TF (UASB+TF).

show abstract

“…Raw sequence data were analyzed according to Hewawasam et al [15]. Clustering of operational taxonomic units (OTUs) was conducted at the 97% similarity level.…”

Section: Microbial Community Analysismentioning

confidence: 99%

Effects of Sulfates on Enhanced Biological Phosphorus Removal in Three Waste Water Treatment Plants

Kanazawa

Yamamoto-Ikemoto

Matsuura

2019

J. of Wat. & Envir. Tech.

Self Cite

View full text Add to dashboard Cite

The effects of sulfates on enhanced biological phosphorus removal (EBPR) were investigated in three municipal wastewater treatment plants (WWTPs), which treat sewage containing several concentrations of sulfates. The behaviour of sulfates and phosphates in the anaerobic oxic process was analysed by considering the daily inflow rate and water quality. Although phosphorus release and uptake were recognized in all plants, phosphorus release from the WWTPs that were treating high-sulfate wastewater (high-sulfate WWTP), was lower than that of the WWTP treating low-sulfate wastewater (lowsulfate WWTP). In the high-sulfate WWTPs, sulfate decreased in the anaerobic zone and increased in the oxic zone. Analysis of the sulfate reduction and sulfur oxidation activities of the sludge showed that both activities were dependent on the influent sulfate concentration. The relative abundance of SRB which oxidize organic matters completely in high-sulfate WWTPs tends to be higher than that in low-sulfate WWTPs. On the other hand, a lower relative abundance of polyphosphate accumulating organisms (PAOs) was recognized in the high-sulfate WWTPs.

show abstract

Oxygen transfer dynamics and nitrification in a novel rotational sponge reactor

Cited by 26 publications

References 29 publications

Membrane Filtration as Post-Treatment of Rotating Biological Contactor for Wastewater Treatment

Membrane Filtration as Post-Treatment of Rotating Biological Contactor for Wastewater Treatment

Downflow Hanging Sponge System: A Self-Sustaining Option for Wastewater Treatment

Effects of Sulfates on Enhanced Biological Phosphorus Removal in Three Waste Water Treatment Plants

Contact Info

Product

Resources

About