Anoxic treatment of phenolic wastewater in sequencing batch reactor

Sarfaraz, Sami; Thomas, Swapna; Tewari, U.K; Iyengar, Leela

doi:10.1016/j.watres.2003.10.039

Cited by 79 publications

(42 citation statements)

References 17 publications

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“…A sequencing batch reactor (SBR) is one of the widely used activated sludge processes to treat both municipal and industrial wastewaters (Ni et al 2009;Sarfaraz et al 2004). However, operation of SBRs always encounters problems.…”

Section: Introductionmentioning

confidence: 99%

The effect of tetrahydrofuran on the enzymatic activity and microbial community in activated sludge from a sequencing batch reactor

et al. 2011

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Tetrahydrofuran (THF) is a toxic and carcinogenic compound that is commonly released from pharmaceutical, chemical and related industry wastewater. Currently, the effects of THF contamination on wastewater are unknown and a better understanding of THF toxicity toward biological processes in wastewater treatment is critical. In this study, we firstly investigated the toxic effects of THF on enzymatic activity and the microbial diversity in activated sludge from a sequencing batch reactor during long-term exposure to 10 mM THF. The activity of five enzymes (catalase, dehydrogenase, urease, phosphatase and protease) was remarkably decreased in the presence of 10 mM THF during a period of 85 days. Of these five affected enzymes, dehydrogenase activity was close to detection level limits and was nearly completely inhibited. Analysis of the microbial community demonstrated that THF, at a concentration of 10 mM, altered the distribution of microbes within the community and significantly decreased microbial diversity during long-term contamination, according to denaturing gradient gel electrophoresis (DGGE) analysis. The fraction of Actinobacteria increased in the community, while the fraction of Proteobacteria significantly decreased after THF exposure.

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Section: Introductionmentioning

confidence: 99%

The effect of tetrahydrofuran on the enzymatic activity and microbial community in activated sludge from a sequencing batch reactor

et al. 2011

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“…However, when shifting the operation from the 72 hours HRT to 24 hours (by increasing the droplets from 1 mL/88 seconds to 1 mL/29 seconds, considering that each 15-16 droplets is equal to 1 mL) in zone D of Figure 4, degradation levels and COD removal of SDBS suddenly decreased to below 88% and 80%, respectively, for both MBBR and control reactors. The abrupt decreases in SDBS removal efficiency with HRT decrease can be connected to the prohibitory effect of SDBS on metabolism, occurring in microbial nutrients as consequence of an increased volumetric loading rate in the bioreactor (15). However, the removal efficiency in both reactors gradually increased, until they reached to the pseudo-steady state.…”

Section: Resultsmentioning

confidence: 99%

Removal of Sodium Dodecylbenzene Sulfonate by Moving Bed Biofilm Reactor, Using Synthetic Media

2014

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Background: Detergents and difficulties of their presence in the water and wastewater cause various problems such as foam production, anomalies in the growth of algae, and accumulation and dispersion in aqueous environments. Objectives: The aim of this study was to examine and compare the moving bed biofilm reactor with another reactor without media (carries) for anionic surfactants removal. Materials and Methods: In this study, the media was from the 2H Company with specific surface of 535 m 2 /m 3 and the experiment reactor was made of a 4-mm plexiglass. The experiment was conducted by using two reactor, as one of them was without media, with exactly similar conditions to compare their operations. The standard method (MBAS) was used to measure the anionic surfactant. The concentrations of the examined anionic surfactant were 50, 100, 200, 300, and 400 mg/L in hydraulic retention times (HRTs) of 72, 24 and 8 hours. Results: The removal percentage for both reactors at 50 mg/L concentration of pollutant was same, but after gradually increasing the pollutant concentration and decreasing the HRT, the media-containing reactor had significant efficiency in comparison with the other one. The optimum condition in this experiment was obtained at HRT of about 24 hours and 200 mg/L pollutant concentration with 99.2% removal. Conclusions: Regarding the anionic surfactant standard in Iran which is 1.5 mg/L for surface water discharge, using this process is suitable for treating municipal wastewater and industrial wastewater, containing 100-200 mg/L pollutant. However, for the industries that produce detergents, discharging more than 200 mg/L surfactants to the wastewater, using supplementary treatments for achieving the discharge standard are required.

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“…[1][2][3][4] These compounds are carcinogenic and dangerous due to their toxicity and high bioaccumulation rate along the food chain. 3 Therefore, phenolic-containing effluents have to be treated properly before discharged into discharge into external environment.…”

Section: Introductionmentioning

confidence: 99%

“…However, physico-chemical methods such as activated carbon adsorption, reverse osmosis, solvent extraction, electrolytic oxidation and chemical oxidation are costly and show incomplete removal of toxic pollutants. 2,[4][5][6][7] In contrast, biological approaches provide economical and eco-friendly treatments of phenolic compounds in addition to the low possibility of by-product formation and hence mineralisation of phenols is achievable. 8 Activated sludge process is one of the widely used biological treatment systems in which the wastewater is treated with a mixture of microorganism.…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of Phenol by Unacclimated and Phenol-acclimated Activated Sludge: Effects of Operational Factors on Biodegradation Efficiency and Kinetics

Peng¹,

Ling²

2017

JPS

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Anoxic treatment of phenolic wastewater in sequencing batch reactor

Cited by 79 publications

References 17 publications

The effect of tetrahydrofuran on the enzymatic activity and microbial community in activated sludge from a sequencing batch reactor

The effect of tetrahydrofuran on the enzymatic activity and microbial community in activated sludge from a sequencing batch reactor

Removal of Sodium Dodecylbenzene Sulfonate by Moving Bed Biofilm Reactor, Using Synthetic Media

Biodegradation of Phenol by Unacclimated and Phenol-acclimated Activated Sludge: Effects of Operational Factors on Biodegradation Efficiency and Kinetics

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