Performance evaluation of an UASB reactor used for combined treatment of domestic sewage and excess aerobic sludge from a trickling filter

Pontes, Patrícia Procópio; Chernicharo, C. A. L.; Frade, E.C.; Porto, Maurizio

doi:10.2166/wst.2003.0406

Cited by 25 publications

(6 citation statements)

References 4 publications

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“…Results of the researches developed by Aisse et al (2000), Chernicharo and Nascimento (2001), and Pontes et al (2003) indicated that that trickling filters as post-treatment unit of UASB reactors can be satisfactory operated at OLR up to 1.5 kgBOD m . Under those operating conditions, UASB+TF systems are usually capable of producing a final effluent with average COD, BOD and TSS concentrations around 120 mgCOD l .…”

Section: Trickling Filtermentioning

confidence: 99%

Post-Treatment Options for the Anaerobic Treatment of Domestic Wastewater

Chernicharo

2006

Rev Environ Sci Biotechnol

193

122

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This paper focuses on the post-treatment options for the anaerobic treatment of domestic wastewater. Initially, the main limitations of anaerobic systems regarding carbon, nutrients and pathogen removal are presented. In sequence, the advantages of combined anaerobic/aerobic treatment and the main post-treatment options currently in use are discussed, including the presentation of flowsheets and a comparison between various post-treatment systems. Lastly, the paper presents a review of emerging options and possible improvements of current post-treatment alternatives.

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Section: Trickling Filtermentioning

confidence: 99%

Post-Treatment Options for the Anaerobic Treatment of Domestic Wastewater

Chernicharo

2006

Rev Environ Sci Biotechnol

193

122

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“…These results suggest that it may be beneficial to add an aerobic polishing step before membrane filtration in an AnMBR to remove the aerobically biodegradable soluble microbial products. Pontes et al (2003) reported that postaerobic treatment could also be used to further remove residual COD in effluent from a conventional USAB by approximately 50%.…”

Section: Parameters Governing Permeate Flux In An Anaerobic Membrane mentioning

confidence: 99%

Parameters Governing Permeate Flux in an Anaerobic Membrane Bioreactor Treating Low‐Strength Municipal Wastewaters: A Literature Review

Bérubé¹,

Hall²,

Sutton³

2006

Water Environment Research

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The objective of this review was to conduct a comprehensive literature survey to identify the parameters that govern the permeate flux in an anaerobic membrane bioreactor (AnMBR) treating municipal wastewater. Based on the survey, research to date indicates that the optimal membrane system for an AnMBR consists of an organic, hydrophilic, and negatively charged membrane with a pore size of approximately 0.1 lm. The use of both external and submerged membrane configurations shows promise. The operating parameters that affect permeate flux in an external membrane system are transmembrane pressure (TMP) and cross-flow velocity. The operating parameters that affect permeate flux in a submerged membrane system are TMP, sparging intensity, and duration of the relaxation period. Both cross-flow velocity and sparging intensity impart a significant amount of shear force on the biomass in an AnMBR. High shear forces can reduce the microbial activity in an AnMBR. In addition, high shear forces can reduce the size of the biosolids in the mixed liquor and increase the release of soluble microbial products. In this respect, external and submerged membrane systems are expected to perform differently because the magnitude of the shear forces to which the biomass is exposed in an external membrane system is significantly greater than that in a submerged system. The size of the biosolid particles and concentration of soluble microbial products in the mixed liquor affect permeate flux. Higher concentrations of soluble microbial products may be present in the mixed liquor when an AnMBR is operated at relatively low operating temperatures. Aerobic polishing following anaerobic treatment can potentially significantly reduce the concentration of some components of the soluble microbial products in the mixed liquor. It is not possible to remove the foulant layer on an organic membrane with caustic cleaning alone. Acidic cleaning or acidic cleaning followed by caustic cleaning is required to remove the foulant layer. This suggests that both biological/organic and inorganic material contribute to membrane fouling. Water Environ. Res., 78, 887 (2006).

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“…Pontes et al [5] demonstrated that over 93% contribution of the UASB reactor was possible by recycling the trickling filter sludge with about 1% recycling ratio of the influent. Jun et al [6] could have 95% contribution of the UASB reactor by recycling the aerated filter (AF) effluent with 100% recycling ratio.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen and phosphorus removal in an anaerobic (UASB)-aerobic (ABF) sewage treatment system

Tian

Lim

Chung

et al. 2015

Desalination and Water Treatment

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A B S T R A C TAnaerobic sewage treatment process using upflow anaerobic sludge blanket (UASB) coupled with aerated biofilter (ABF) was tested for the removal of nitrogen and phosphorus by recycling the final effluent and by adding alum to the influent. TCOD Removal efficiency was about 60% in UASB without recycling of the ABF effluent, while it increased to 90% at recycling ratio of 3. Complete denitrification had occurred in the UASB, and removal efficiencies of both total nitrogen (TN) and NH þ 4 -N were also improved to 74 and 96%, respectively, by recycling the nitrified ABF effluent. Total phosphorus (TP) removal was not improved by recycling of the ABF effluent. TP and soluble phosphorus were effectively removed in UASB by adding alum to the influent. 90% removal of TP was possible with alum dose at Al/P mole ratio of 2.6. In the final effluent, concentrations of TCOD, TN, and TP were below 14.0, 7.0, and 0.27 mg/L, respectively, in the UASB-ABF sewage treatment system at recycling ratio of 3 with alum.

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Performance evaluation of an UASB reactor used for combined treatment of domestic sewage and excess aerobic sludge from a trickling filter

Cited by 25 publications

References 4 publications

Post-Treatment Options for the Anaerobic Treatment of Domestic Wastewater

Post-Treatment Options for the Anaerobic Treatment of Domestic Wastewater

Parameters Governing Permeate Flux in an Anaerobic Membrane Bioreactor Treating Low‐Strength Municipal Wastewaters: A Literature Review

Nitrogen and phosphorus removal in an anaerobic (UASB)-aerobic (ABF) sewage treatment system

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