Optimization of sulfate removal by sulfate reducing bacteria using response surface methodology and heavy metal removal in a sulfidogenic UASB reactor

Najib, Tahereh; Solgi, Mostafa; Farazmand, Abbas; Heydarian, Seyed Mohammad; Nasernejad, Bahram

doi:10.1016/j.jece.2017.06.016

Cited by 60 publications

(31 citation statements)

References 44 publications

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“…Currently, several technologies, such as biological treatment [7,8], membrane filtration [9], adsorption [10], ion exchange [11,12], electrocoagulation [13], crystallization [14,15], and chemical precipitation [16], have been developed to treat sulfate in water. However, these methods are not very suitable for the treatment of high concentration of SO 4 2− wastewater, except the chemical precipitation method.…”

Section: Introductionmentioning

confidence: 99%

Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect

Fang

Tang

Chen

et al. 2018

Journal of Chemistry

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e feasibility of removal of sulfate ions from the sodium alkali FGD wastewater using the ettringite precipitation method was evaluated. Factors affecting the removal of sulfate ions, such as NaAlO 2 dosage, Ca(OH) 2 dosage, solution temperature, anions (Cl − , NO 3 − and F − ), and heavy metal ions (Mg 2+ and Mn 2+ ), were investigated, and the optimal experimental conditions for the removal of sulfate ions were determined. Experimental results indicate that the ettringite precipitation method can effectively remove SO 4 2− with removal efficiency of more than 98%. All the investigated factors have influences on the removal of sulfate ions, and among them, the dosage of reagents, solution temperature, and fluoride ions have the strongest influence. In addition, the method can effectively synergistically remove F − and heavy metal ions with removal efficiencies of more than 90% and 99%, respectively; meanwhile, Cl − and NO 3 − also can be removed minimally by the method. e result of actual wastewater treatment shows that the method is feasible for treating high-concentration sulfate wastewater. e ettringite precipitation method has the potential to be a commercial application in the future.

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Section: Introductionmentioning

confidence: 99%

Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect

Fang

Tang

Chen

et al. 2018

Journal of Chemistry

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“…AP is the signal-to-noise ratio, which compares the range of predicted values at the design points to the average prediction error. AP greater than 4 is generally considered favorable (27,28). In this study, AP for chromium removal and water recycling was 16.50 and 23.91, respectively, which indicates the presence of good signals.…”

Section: Discussionmentioning

confidence: 50%

Chromium removal and water recycling from electroplating wastewater through direct osmosis: Modeling and optimization by response surface methodology

Naghdali

Sahebi

Ghanbari

et al. 2019

Environ Health Eng Manag

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Background: Considering the carcinogenic effects of heavy metals, such as chromium, it is essential to remove these elements from water and wastewater. Direct osmosis is a new membrane technology, which can be a proper alternative to conventional chromium removal processes. Methods: The wastewater samples were collected from an electroplating unit, located in Alborz industrial city, Qazvin, Iran. Magnesium chloride was used as the draw solution, and a semipermeable membrane (Aquaporin) was used in this study. The experiments were designed, using response surface methodology (RSM) and central composite design (CCD) with draw solution concentration (0.5- 1.5 M), feed solution concentration (4-12 mg/L), and experiment time (30-90 minutes) as variable factors. The chromium concentration and water flux were also measured, based on atomic absorption spectrophotometry and water flux equation, respectively. Results: Direct osmosis was highly efficient in chromium removal and water recycling. Water flux and chromium removal efficiency were 15.6 LMH and 85.58%, respectively, under optimal conditions (draw solution = 1.27 mol/L, feed solution = 4 mg/L, and experiment time = 90 min). In terms of validity, the results predicted by the quadratic polynomial model were in good agreement with the responses reported in the laboratory. Conclusion: In direct osmosis, the use of magnesium chloride as the draw solution resulted in the acceptable chromium removal from electroplating wastewater. Using this method, chromium concentration in wastewater reduced to a level lower than the discharge standards, established by Iran’s Department of Environment.

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“…In addition, the low COD/SO 4 2ratio used (1.00 ± 0.12), may have also affected the process efficiency, as according to Vilela et al (2014), a COD/SO 4 2ratio of approximately 1.9 is ideal for incomplete ethanol oxidizers to promote an efficient sulfidogenic process. Najib et al (2017) also reported the effect of the COD/ sulfate ratio and pH reduction from neutral 7 to 6 on an ethanol feed reactor. When COD/sulfate ~ 2 was used, efficiencies of 96% were obtained, likewise reduced to 39% for a COD/sulfate ratio of 0.5.…”

Section: Phase 2: Performance and Microbial Communities Of The Lac Ementioning

confidence: 99%

Potential of Autochthonous Sulfate-Reducing Microbial Communities for Treating Acid Mine Drainage in a Bench-Scale Sulfidogenic Reactor

Giordani

Hayashi

Rodriguez

et al. 2019

Braz. J. Chem. Eng.

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Biological acid mine drainage treatment depends significantly on inoculum origin, pH, COD/sulfate ratio, and carbon source. In this study, the performance and microbial diversity of anaerobic batch reactors used for sulfate reduction was evaluated. A medium COD/sulfate ratio of 1.14 ± 0.10 was used, and the evaluation was performed in two steps: Phase 1, based on the inoculum source (autochthonous, AUT, and non-autochthonous, N-AUT); and Phase 2, based on the carbon source (lactate, ethanol, and formate) and low pH. In Phase 1, the sulfate removal using both AUT and N-AUT biomasses were similar, 53% and 59%, respectively. In Phase 2, ethanol and lactate as electron donors yielded similar sulfate removal efficiencies of 42% and 44%, respectively, at neutral pH. When the initial pH was reduced from 4 to 3, sulfate removal using formate remained nearly constant at 34%, whereas it reduced from 43% to 30% with lactate, and dropped significantly from 18% to 7% with ethanol. Denaturing gradient gel electrophoresis analyses for sulfate-reducing bacteria revealed their presence in all samples. Microbial activity and sulfate removal obtained for AUT cultures indicated that they possess the potential for use in local acid mine drainage decontamination processes.

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Optimization of sulfate removal by sulfate reducing bacteria using response surface methodology and heavy metal removal in a sulfidogenic UASB reactor

Cited by 60 publications

References 44 publications

Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect

Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect

Chromium removal and water recycling from electroplating wastewater through direct osmosis: Modeling and optimization by response surface methodology

Potential of Autochthonous Sulfate-Reducing Microbial Communities for Treating Acid Mine Drainage in a Bench-Scale Sulfidogenic Reactor

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