Mechanism and kinetics of Zn(II) removal from wastewater by immobilised beads of SRB sludge

Chai, Liyuan; Min, Xin; Tang, Ning Kang; Wang, Yunyan

doi:10.1504/ijep.2009.024468

Cited by 11 publications

(1 citation statement)

References 15 publications

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“…This is attributed to the predominance of nucleation over crystallization, which favors the formation of small precipitates that are difficult to settle . The other source of sulfide is biogenic sulfide generated by sulfate‐reducing bacteria (SRB) . Unfortunately, the size of the biogenic sulfide precipitates is always smaller than that of chemical sulfide precipitate, leading to lower sludge solid–liquid separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Abiological Granular Sludge Formation Benefit for Heavy Metal Wastewater Treatment Using Sulfide Precipitation

Chai

et al. 2017

CLEAN Soil Air Water

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Solid-liquid separation is a fundamental and ubiquitous process in water purification. Previously, an abiological granular sludge (ABGS) formation strategy was developed to improve the solid-liquid separation in heavy metal wastewater treatment. Although this strategy can be effectively applied in hydroxide precipitation, it remains challenging to apply it to other precipitation processes and real wastewater. Here, conditions for ABGS formation in the sulfide precipitation were first optimized. The effect of pH, seed dosage, and flocculant dosage on settling velocity and metal removal was systematically investigated. The results showed that the settling velocity of ABGS reached up to 3.7 cm/s and the volume of ABGS was compressed to one fifth of the original under optimal conditions, that is, pH of 8.5, seeds dosage of 0.25 g/L, and polyacrylamide dosage of 10 mg/L. Moreover, the ABGS formed in the process was analyzed for morphology and phase composition to provide insight into the formation mechanism, involving surface nucleation and aggregation, flocculation, and rearrangement. Under the optimized conditions, real Pb-Zn smelting wastewater was treated. The settling velocity (3.4 cm/s) of ABGS formed in real wastewater was as high as that in synthetic wastewater. Therefore, the ABGS strategy is potential to be scaled up to industrial application.

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Section: Introductionmentioning

confidence: 99%

Abiological Granular Sludge Formation Benefit for Heavy Metal Wastewater Treatment Using Sulfide Precipitation

Chai

et al. 2017

CLEAN Soil Air Water

Self Cite

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Removal of nitrogen from wastewaters by anaerobic ammonium oxidation (ANAMMOX) using granules in upflow reactors

et al. 2017

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Solid-liquid separation: an emerging issue in heavy metal wastewater treatment

Chai

Wang

et al. 2018

Environ Sci Pollut Res

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Solid-liquid separation (SLS) plays a dominant role in various chemical industries. Nowadays, low efficiency of SLS also become a significant problem in heavy metal (HM) wastewater treatment, affecting the effluent quality (HM concentration and turbidity) and overall process economy. In this context, we summarize here the occurrence of solids in HM wastewater, as well as typical SLS operations used in HM wastewater treatment, including sedimentation, flotation, and centrifugation. More important, this article reviews the improvement of the SLS operations by some technologies, including coagulation, flocculation, ballasted method, seeding method, granular sludge strategy, and external field enhancement. It is noted that abiological granular sludge strategy and magnetic field enhancement often possess higher SLS efficiency (faster settling velocity or shorter separation time) than other methods. Hence, the two strategies stand out as promising tools for improving SLS in HM wastewater treatment, but further research is required regarding scalability, economy, and reliability.

show abstract

Mechanism and kinetics of Zn(II) removal from wastewater by immobilised beads of SRB sludge

Cited by 11 publications

References 15 publications

Abiological Granular Sludge Formation Benefit for Heavy Metal Wastewater Treatment Using Sulfide Precipitation

Abiological Granular Sludge Formation Benefit for Heavy Metal Wastewater Treatment Using Sulfide Precipitation

Removal of nitrogen from wastewaters by anaerobic ammonium oxidation (ANAMMOX) using granules in upflow reactors

Solid-liquid separation: an emerging issue in heavy metal wastewater treatment

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