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Nitrate removal with bacterial cells attached to quartz sand and zeolite from salty wastewaters

Abstract

A mixed bacterial culture was acclimated to the removal of high nitrate-N concentrations (100–750 mg NO3 -N L−1) from salty wastewaters. The experiments were carried out under anoxic conditions in the presence of 0.5, 1.5 and 3% (w/v) NaCl at different temperatures. The acclimated mixed bacterial culture was attached to quartz sand and zeolite. Denitrification was monitored in a continuous-flow bioreactor at different hydraulic retention times (HRT). Nitrate removal with cells attached to quartz sand and zeolite was completed at HRT of 167 h and 25 h respectively. Then brine denitrification with bacterial cells attached to zeolite was monitored for 85 days. Under the increased nitrate loading rate, nitrate removal was above 90%. Furthermore, during denitrification, not more than 0.5 mg NO2 -N L−1 could be produced. It can be concluded that nitrate removal with the cells attached to zeolite is economically and operationally a promising solution to denitrification of brine wastewaters.

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Correspondence to Lucija Foglar.

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Foglar, L., Sipos, L. & Bolf, N. Nitrate removal with bacterial cells attached to quartz sand and zeolite from salty wastewaters. World J Microbiol Biotechnol 23, 1595–1603 (2007). https://doi.org/10.1007/s11274-007-9405-8

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Keywords

  • Denitrification
  • Spent brine
  • Mixed bacterial culture
  • Anoxic conditions
  • Quartz sand
  • Zeolite