Influence of nitrate and COD on phosphorus, nitrogen and dinitrotoluene (DNT) removals under batch anaerobic and anoxic conditions

SPONZA D. T., Atalay M.

ANAEROBE, cilt.10, sa.5, ss.287-293, 2004 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 10 Sayı: 5
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1016/j.anaerobe.2004.06.002
  • Dergi Adı: ANAEROBE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.287-293
  • Anahtar Kelimeler: anoxic, dinitrotoluene, methanogenic, nitrate, phosphorous, AZO DYES, 2,4-DINITROTOLUENE, DENITRIFICATION, BIOTRANSFORMATION, BIODEGRADATION, IDENTIFICATION, DEGRADATION, MECHANISM, DIGESTERS, BACTERIA
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

In this study, the effects of COD to NO3-N ratio in the feed on PO4-P removal was investigated. Maximum PO4-P uptake was obtained in the anoxic reactor when the COD to NO3-N ratios were between 2 and 3.75. With the influent COD of 800-1500 mg COD/L a total of the maximum removable PO4-P was 56 mg PO4-P/L through 20 days of anaerobic/anoxic incubation, indicating 98% P removal in the anoxic reactor. Similarly, for the COD to NO3-N ratios varying between 2 and 3.75 maximum denitrification was observed. Through anoxic operation the poly-P bacteria are capable of removing NO3-N using VFA, COD as carbon source and NO3-N as the electron acceptor after methanogenesis has been completed. High NO3-N concentrations stopped significantly the P uptake. A total of 97-99% dinitrotoluene removal efficiencies in the reactors containing COD to NO3-N ratio of 2 and 3.75 after 20 days of incubation period. For maximum NO3-N and PO4-P removals optimal COD to NO3-N ratios, COD and NO3-N concentrations were 2-3.75, 2000-4000 mg COD/L and, 800-1500 mg NO3-N/L, respectively. (C) 2004 Elsevier Ltd. All rights reserved.