Feasibility of a pulsed sequencing batch reactor with anaerobic aggregated biomass for the treatment of low strength wastewaters

This study concerns an assessment of a SBR operation that associates anaerobic aggregated biomass with a pulsed action during the reaction phase, a system named Pulsed Sequencing Batch Reactor (P-SBR). The system uses a diaphragm pump as a pulsator unit to increase the liquid-solid contact, in order to avoid dead zones and possible external mass transfer resistance. A preliminary study of the operation of the reactor was performed with a low strength synthetic wastewater with a COD near 1000 mg.1−1 and a sub-optimal temperature of 22°C. A removal efficiency of 60-70% was attained after 5 and 6 hours of reaction time. The respective organic loads were 5 – 6 kg COD.m−3. day−1, thus supporting the feasibility of the P-SBR system for wastewater treatment in such conditions. The results also indicate that a ratio of 1.8%o between the swept volume delivered by the pump and the reactor volume was adequate to promote a flow turbulence in the sludge blanket and that a redox potential of near −400 mV was readily created by anaerobic bacteria after the reactor filling step.

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Excess nitrogen accumulation in activated sludge in sequencing batch reactor with a single-stage oxic process

Water Science & Technology ◽

10.2166/wst.2009.003 ◽

2009 ◽

Vol 59 (3) ◽

pp. 573-582 ◽

Cited By ~ 3

Author(s):

Xiao-ming Li ◽

Dong-bo Wang ◽

Qi Yang ◽

Wei Zheng ◽

Jian-bin Cao ◽

...

Keyword(s):

Activated Sludge ◽

Nitrogen Removal ◽

Sequencing Batch Reactor ◽

Ph Value ◽

Batch Reactor ◽

Nitrogen Loss ◽

Single Stage ◽

Synthetic Wastewater ◽

Nitrogen Accumulation ◽

Excess Nitrogen

It was occasionally found that a significant nitrogen loss in solution under neutral pH value in a sequencing batch reactor with a single-stage oxic process using synthetic wastewater, and then further studies were to verify the phenomenon of nitrogen loss and to investigate the pathway of nitrogen removal. The result showed that good performance of nitrogen removal was obtained in system. 0–7.28 mg L−1 ammonia, 0.08–0.38 mg L−1 nitrite and 0.94–2.12 mg L−1 nitrate were determined in effluent, respectively, when 29.85–35.65 mg L−1 ammonia was feeding as the sole nitrogen source in influent. Furthermore, a substantial nitrogen loss in solution (95% of nitrogen influent) coupled with a little gaseous nitrogen increase in off-gas (7% of nitrogen influent) was determined during a typical aerobic phase. In addition, about 322 mg nitrogen accumulation (84% of nitrogen influent) was detected in activated sludge. Based on nitrogen mass balance calculation, the unaccounted nitrogen fraction and the ratio of nitrogen accumulation in sludge/nitrogen loss in solution were 14.6 mg (3.7% of nitrogen influent) and 0.89, respectively. The facts indicated that the essential pathway of nitrogen loss in solution in this study was excess nitrogen accumulation in activated sludge.

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Performance of the anammox sequencing batch reactor treating synthetic and real landfill leachate

E3S Web of Conferences ◽

10.1051/e3sconf/20184400179 ◽

2018 ◽

Vol 44 ◽

pp. 00179 ◽

Cited By ~ 1

Author(s):

Mariusz Tomaszewski ◽

Grzegorz Cema ◽

Tomasz Twardowski ◽

Aleksandra Ziembińska-Buczyńska

Keyword(s):

Nitrogen Removal ◽

Landfill Leachate ◽

Sequencing Batch Reactor ◽

Batch Reactor ◽

Nitrogen Loading ◽

Synthetic Wastewater ◽

High Nitrogen ◽

Removal Capacity ◽

Anammox Activity ◽

Anammox Process

The anaerobic ammonium oxidation (anammox) process is one of the most energy efficient and environmentally-friendly bioprocess for the treatment of the wastewater with high nitrogen concentration. The aim of this work was to study the influence of the high nitrogen loading rate (NLR) on the nitrogen removal in the laboratory-scale anammox sequencing batch reactor (SBR), during the shift from the synthetic wastewater to landfill leachate. In both cases with the increase of NLR from 0.5 to 1.1 – 1.2 kg N/m3d, the nitrogen removal rate (NRR) increases to about 1 kg N/m3d, but higher NLR caused substrates accumulation and affects anammox process efficiency. Maximum specific anammox activity was determined as 0.638 g N/g VSSd (NRR 1.023 kg N/m3d) and 0.594 g N/g VSSd (NRR 1.241 kg N/m3d) during synthetic and real wastewater treatment, respectively. Both values are similar and this is probably the nitrogen removal capacity of the used anammox biomass. This indicates, that landfill leachate did not influence the nitrogen removal capacity of the anammox process.

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Start-up of an Anaerobic Sequencing Batch Reactor (ASBR) Treating Low Strength Swine Manure

10.13031/2013.27359 ◽

2009 ◽

Author(s):

Matthew T Steele ◽

Douglas W Hamilton

Keyword(s):

Sequencing Batch Reactor ◽

Batch Reactor ◽

Swine Manure ◽

Anaerobic Sequencing Batch Reactor ◽

Start Up ◽

Low Strength

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Efficient treatment of dairy processing wastewater in a laboratory scale Intermittently Aerated Sequencing Batch Reactor (IASBR)

Journal of Dairy Research ◽

10.1017/s0022029918000584 ◽

2018 ◽

Vol 85 (3) ◽

pp. 379-383 ◽

Cited By ~ 1

Author(s):

Peter Leonard ◽

Emma Tarpey ◽

William Finnegan ◽

Xinmin Zhan

Keyword(s):

Wastewater Treatment ◽

Retention Time ◽

Wastewater Treatment Plant ◽

Sequencing Batch Reactor ◽

Batch Reactor ◽

Treatment Plant ◽

Laboratory Scale ◽

Synthetic Wastewater ◽

Operational Parameters ◽

Dairy Processing

This Research Communication describes an investigation into the viability of an Intermittently Aerated Sequencing Batch Reactor (IASBR) for the treatment of dairy processing wastewater at laboratory-scale. A number of operational parameters have been varied and the effect has been monitored in order to determine optimal conditions for maximising removal efficiencies. These operational parameters include Hydraulic Retention Time (HRT), Solids Retention Time (SRT), aeration rate and cycle length. Real dairy processing wastewater and synthetic wastewater have been treated using three laboratory-scale IASBR units in a temperature controlled room. When the operational conditions were established, the units were seeded using sludge from a municipal wastewater treatment plant for the first experiment, and sludge from a dairy processing factory for the second and third experiment. In experiment three, the reactors were fed on real wastewater from the wastewater treatment plant at this dairy processing factory. These laboratory-scale systems will be used to demonstrate over time that the IASBR system is a consistent, viable option for treatment of dairy processing wastewater in this sector. In this study, the capacity of a biological system to remove both nitrogen and phosphorus within one reactor will be demonstrated. The initial operational parameters for a pilot-scale IASBR system will be derived from the results of the study.

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Effect of continuously dosing Cu(II) on pollutant removal and soluble microbial products in a sequencing batch reactor

Water Science & Technology ◽

10.2166/wst.2015.385 ◽

2015 ◽

Vol 72 (9) ◽

pp. 1653-1661 ◽

Cited By ~ 1

Author(s):

YangWei Yan ◽

YuWen Wang ◽

Yan Liu ◽

Xiang Liu ◽

ChenChao Yao ◽

...

Keyword(s):

Removal Efficiency ◽

Extracellular Polymeric Substances ◽

Sequencing Batch Reactor ◽

Batch Reactor ◽

Pollutant Removal ◽

Cod Removal ◽

Synthetic Wastewater ◽

Soluble Microbial Products ◽

Cod Removal Efficiency ◽

Microbial Products

The effects of synthetic wastewater that contained 20 mg/L Cu(II) on the removal of organic pollutants in a sequencing batch reactor were investigated. Results of continuous 20 mg/L Cu(II) exposure for 120 days demonstrated that the chemical oxygen demand (COD) removal efficiency decreased to 42% initially, followed by a subsequent gradual recovery, which peaked at 78% by day 97. Effluent volatile fatty acid (VFA) concentration contributed 67 to 89% of the influent COD in the experimental reactor, which indicated that the degradation of the organic substances ceased at the VFA production step. Meanwhile, the varieties of soluble microbial products (SMP) content and main components (protein, polysaccharide, and DNA) were discussed to reveal the response of activated sludge to the toxicity of 20 mg/L Cu(II). The determination of Cu(II) concentrations in extracellular polymeric substances (EPS) and SMP throughout the experiment indicated an inverse relationship between extracellular Cu(II) concentration and COD removal efficiency.

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