Methanosarcina domination in anaerobic sequencing batch reactor at short hydraulic retention time

In this study, a lab-scale Partial Nitritation Sequencing Batch Reactor (PNSBR) was implemented for treating high-ammonium old landfill leachate to yield an appropriate NO2—N/ NH4+-N ratio from 1/1 to 1.32/1 mixture as a pretreatment for subsequent Anammox. The objective of this study was to determine the optimal hydraulic retention time (HRT) at different influent ammonia concentrations for 210 days. The experimental results showed that with the influent ammonia concentrations of 500, 1000, 1500 and 2000 mg/L, HRT is 12 h, 21 h, 30 h and 48 h, respectively. The range of free ammonia (FA) concentration from 17 to 44 mg/L completely inhibited nitrite oxidizing bacteria (NOB) for long time operation. The COD removal efficiency was very low (6±2) %.

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Influence of hydraulic retention time on the operation of a submerged membrane sequencing batch reactor (SM-SBR) for the treatment of greywater

Desalination ◽

10.1016/j.desal.2008.03.066 ◽

2009 ◽

Vol 246 (1-3) ◽

pp. 444-451 ◽

Cited By ~ 20

Author(s):

R. Scheumann ◽

M. Kraume

Keyword(s):

Retention Time ◽

Sequencing Batch Reactor ◽

Hydraulic Retention Time ◽

Batch Reactor

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Bio-anaerobic treatability study for PCBs-contaminated oil

Water Science & Technology ◽

10.2166/wst.2006.191 ◽

2006 ◽

Vol 53 (6) ◽

pp. 161-167 ◽

Cited By ~ 2

Author(s):

S.Y. Ahn ◽

S.J. Kim ◽

P.Y. Yang

Keyword(s):

Removal Efficiency ◽

Sequencing Batch Reactor ◽

Hydraulic Retention Time ◽

Loading Rate ◽

Batch Reactor ◽

Organic Loading Rate ◽

Operational Parameters ◽

Loading Rates ◽

Anaerobic Sequencing Batch Reactor ◽

Us Epa

This study investigated the bio-treatability of PCB contaminated oil for the development of design and operational parameters for the bioreactor. Input of external carbon and nutrient source in the aqueous phase was found to be required for the treatment of polychlorinated biphenyls (PCBs)-contaminated oil. Addition of surfactant was investigated for the emulsification of oil to reduce interference of contact with microorganisms and PCBs. The ratio of surfactant to oil was empirically optimized to 1 : 1. The higher PCB removal efficiency was obtained at 30 days of hydraulic retention time (HRT) in the semi-batch reactor study without cell recycle. The removal efficiency measured in mixed liquor was maintained at over 85% on average at 32±2 °C and 30% at 22±2 °C. More than 0.2 g/l/d of the organic loading rate was suggested to be maintained for various PCB loading rates (0.02–0.6 mg-PCB/l/d). For high biomass retaining and easy collection of treated oil, an Anaerobic Sequencing Batch Reactor (ASBR) was investigated. The removal of Aroclor was observed as more than 50% in the oil phase with 3 days reaction time and about 40% in overall phases, i.e. oil, liquid, biomass phases at 22±2 °C. US EPA verification results on the process performance are included in this presentation.

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