Nitrogen Removal from Industrial Wastewaters
Kuvaja, Virva (2018)
2018
Ympäristö- ja energiatekniikka
Teknis-luonnontieteellinen tiedekunta – Faculty of Natural Sciences
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Hyväksymispäivämäärä
2018-06-06
Julkaisun pysyvä osoite on
http://urn.fi/URN:NBN:fi:tty-201805241829
http://urn.fi/URN:NBN:fi:tty-201805241829
Tiivistelmä
Industrial activities generate wastewaters that contain nitrate, which needs to be treated before discharge due to possible harmful environmental effects. One common method is biological wastewater treatment where nitrate is removed with denitrification.
Aim of this study was to evaluate suitability of biological nitrate removal with warm industrial wastewaters. Laboratory scale fluidized bed reactors were used to estimate efficiency of wastewater treatment system and denitrification potential of nitrate and sulfate -containing industrial wastewaters. Laboratory experiment was divided into four operational phases: Biofilm formation, acclimatization with step-wise increase of feed nitrate concentration, continuous operation with 4 000 mg/l of nitrate, and elevated nitrate feed with 20 000 mg/l of nitrate.
Most stable process and treatment efficiency was in mesophilic reactor after acclimatization to 4 000 mg/l of nitrate in feed. Nitrogen removal efficiency was >99% with 5.5 h HRT in mesophilic reactor and with 8.0 h HRT in thermophilic reactor.
Aim of this study was to evaluate suitability of biological nitrate removal with warm industrial wastewaters. Laboratory scale fluidized bed reactors were used to estimate efficiency of wastewater treatment system and denitrification potential of nitrate and sulfate -containing industrial wastewaters. Laboratory experiment was divided into four operational phases: Biofilm formation, acclimatization with step-wise increase of feed nitrate concentration, continuous operation with 4 000 mg/l of nitrate, and elevated nitrate feed with 20 000 mg/l of nitrate.
Most stable process and treatment efficiency was in mesophilic reactor after acclimatization to 4 000 mg/l of nitrate in feed. Nitrogen removal efficiency was >99% with 5.5 h HRT in mesophilic reactor and with 8.0 h HRT in thermophilic reactor.