Biological treatment of refinery spent caustics under halo-alkaline conditions

Graaff, Marco de; Bijmans, Martijn F.M.; Abbas, Ben; Euverink, Gert-Jan; Muyzer, Gerard; Janssen, A.J.H.

doi:10.1016/j.biortech.2011.04.095

Cited by 60 publications

(22 citation statements)

References 38 publications

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“…Marco de Graff and colleagues also showed that sulfide could be completely removed at pH 9.5, Na+ 0.8 M by applying a sulfur-oxidizing bacteria belonging to the genus Thioalkalivibrio [15]. In our study, optimal conditions for the growth and removal of thiosulfate was determined in batch cultures.…”

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confidence: 56%

“…Diluted caustic solutions (NaOH, 5-10 % w/w) are usually used for scrubbing hydrocarbon streams to absorb sulfur compounds such as H 2 S and thiols and finally this process results in sulfurcontaining waste water known as sulfidic spent caustic (SSC). This harmful waste has alkalinity over 12, salinity of 5-12 % w/wand high sulfide (HS -and S 2-) level exceeding 2-3 % w/w [8,[13][14][15]. Sulfidic spent caustic may also contain toxic organo-sulfuric compounds such as methanethiol, and aromatic hydrocarbons like benzene [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…The optimal temperature for growth was 37 ºC and maximum rate of thiosulfate removal was concluded at 35 and 37 ºC similarly, but no growth was observed at 40 ºC. Marco de Graff used Thioalkalivibrio at 35º C, at alkaline condition by sulfide loading rates up to 27 mM day-1and sulfide was completely oxidized to sulfate [15]. Accordingly, highest thiosulfate depletion, as the sole energy source could be achieved at a temperature slightly above the optimal growth conditions, in which extra energy is required for cellular activities and maintenance.…”

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confidence: 99%

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Study on Haloalkaliphilic Sulfur-Oxidizing Bacterium for Thiosulfate Removal in Treatment of Sulfidic Spent Caustic

Makzum

Amoozegar

Dastgheib³

et al. 2016

ILNS

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Abstract. Due to the disadvantages of physiochemical methods for sulfidic spent caustic treatment, attentions are drawn to the environmental-friendly biotreatments including sulfur-oxidizing haloalkaliphiles. Thioalkalivibrio versutus DSM 13738 was grown at alkaline (pH10) autotrophic medium with sodium carbonate/bicarbonate as the sole source of carbon and amended with sodium thiosulfate as the electron and energy source. The effect of various parameters including temperature (25-40 °C), pH (8-11), NaCl concentration (0.5-5 % w/v) and sodium thiosulfate concentrations (100-750 mM) was evaluated on bacterial growth and thiosulfate removal. This strain could eliminate sodium thiosulfate at very high concentrations up to 750 mM. The results showed that the highest specific growth rate was pH 9.5 and thiosulfate removal of Thioalkalivibrio versutus occurred at pH 10.5. The optimum salt concentration for thiosulfate removal was 2.5 % w/v and 5 % NaCl and specific growth rate elevated 2.5% w/v. It was also specified that this strain thrives occurred in 37 ºC and at 35 and 37 ºC higher removal of thiosulfate. Following chemical oxidation of sulfide to thiosulfate, application of Thioalkalivibrio versutus could be promising for spent caustic treatment. Since thiosulfate is utilized as an energy source, highest removal efficiency occurred at marginally different conditions compared to optimal growth.

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confidence: 56%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Study on Haloalkaliphilic Sulfur-Oxidizing Bacterium for Thiosulfate Removal in Treatment of Sulfidic Spent Caustic

Makzum

Amoozegar

Dastgheib³

et al. 2016

ILNS

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“…Critical flux was determined by using flux step method 8 for each MLSS. A new membrane was used for each different MLSS concentration, and the critical flux was measured at the beginning of the operation for each MLSS.…”

Section: Resistance In Seriesmentioning

confidence: 99%

“…MBRs are capable in removing organicand inorganic matter, resisting high organic loading and overcoming settleability problem, however, treating high strength wastewater with the same concept needs more research. 5,8 The limitation of MBR is membrane fouling, which causes deposition of biosolids cake layer on the membrane surface. 1,2,9 In general, high MLSS improves the performance of MBR since high biomass content tends to increase the biodegradable process.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Membrane Bioreactor in Treating Spent Sulfidic Caustic Wastewater: Effects of Organic Biomass Concentration and Solid Retention Time

Mutamim

Noor²

2017

Chem. Eng. Res. Bull.

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This paper presents a study on the performance of an Aerobic Submerged u-shaped membrane bioreactor (ASMBR) in treating sulfidic spent caustic (SSC) in terms of mixed liquor suspended solid (MLSS) concentration and solid retention time (SRT). SSC wastewater is categorized as high strength wastewater and consists of high inorganic and organic matter. U-shape membrane bioreactors have a higher tendency to foul compared to other types of MBR. MLSS concentration and SRT are the major parameters when operating membrane bioreactor. In this study, COD removal recorded reduction of more than 95% for average MLSS concentration runs and 90% for SRTs runs. Meanwhile, sulfide was removed 99%, and formed up to 79% of sulfate. The biofouling for MLSS concentration and SRTs were observed through TMP rate change and TMP average performance, TMP trend and SMP and EPS trends. Biocake layer and biolayer deposited on membrane surface was found influenced by biomass, the inert particulate biomass products accumulating in the reactor.

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