Biodegradation

, Volume 25, Issue 1, pp 127–136 | Cite as

Performance and granulation in an upflow anaerobic sludge blanket (UASB) reactor treating saline sulfate wastewater

  • Jin Li
  • Lian Yu
  • Deshuang Yu
  • Dan Wang
  • Peiyu Zhang
  • Zhongguang Ji
Original Paper

Abstract

An upflow anaerobic sludge blanket reactor was employed to treat saline sulfate wastewater. Mesophilic operation (35 ± 0.5 °C) was performed with hydraulic retention time fixed at 16 h. When the salinity was 28 g L−1, the chemical oxygen demand and sulfate removal efficiencies were 52 and 67 %, respectively. The salinity effect on sulfate removal was less than that on organics removal. The methane productions were 887 and 329 cm3 L−1 corresponding to the NaCl concentrations of 12 and 28 g L−1, respectively. High salinity could stimulate microbes to produce more extracellular polymeric substances (EPSs) and granulation could be performed better. Besides, with the high saline surroundings, a great deal of Na+ compressed the colloidal electrical double-layer, neutralized the negative charge of the sludge particles and decreased their electrostatic repulsion. The repulsion barrier disappeared and coagulation took place. The maximum size of granules was 5 mm, which resulted from the coupled triggering forces of high EPSs and Na+ contents. Sulfate-reducing bacteria (SRB) were dominant in the high saline surroundings while the methane-producing archaea dominated in the low saline surroundings. The SRB were affected least by the salinity.

Keywords

Anaerobic processes Biodegradation Biodesulfurization Fluorescence in situ hybridization (FISH) Granulation Waste-water treatment 

Abbreviations

UASB

Upflow anaerobic sludge blanket

COD

Chemical oxygen demand

EPS

Extracellular polymeric substances

SRB

Sulfate-reducing bacteria

FISH

Fluorescence in situ hybridization

MPA

Methane-producing archaea

MLSS

Mixed liquor suspended solids

MLVSS

Mixed liquor volatile suspended solids

HRT

Hydraulic retention time

ORP

Oxidation-reduction potential

FITC

Fluorescein isothiocyanate

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Jin Li
    • 1
  • Lian Yu
    • 2
  • Deshuang Yu
    • 1
  • Dan Wang
    • 3
  • Peiyu Zhang
    • 1
  • Zhongguang Ji
    • 2
  1. 1.School of Chemical and Environmental Engineering, Qingdao UniversityQingdaoPeople’s Republic of China
  2. 2.State Key Laboratory of Environmental Aquatic ChemistryResearch Center for Eco-Environmental Sciences, Chinese Academy of SciencesBeijingPeople’s Republic of China
  3. 3.National Marine Environmental Forecasting Center, State Oceanic AdministrationBeijingPeople’s Republic of China

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