Simultaneous toxicity and nutrient removals in simulated dephanox (anaerobic/anoxic/oxic sequentials) process treating antibiotics

SPONZA D. T., Atalay H.

FRESENIUS ENVIRONMENTAL BULLETIN, cilt.15, ss.753-762, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 15
  • Basım Tarihi: 2006
  • Dergi Adı: FRESENIUS ENVIRONMENTAL BULLETIN
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.753-762
  • Anahtar Kelimeler: antibiotic, kemicetine, modified DEPHANOX, anoxic, anaerobic, aerobic, PHOSPHORUS REMOVAL, METHANOGENIC CONDITIONS, AZO DYES, DENITRIFICATION, BIODEGRADATION, SYSTEMS
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

A modified DEPHANOX process, including two upflow sludge blanket (USB) reactors, an anaerobic-upflow sludge blanket (UASB) and an anoxic-upflow anoxic sludge blanket (UA(N)SB) one, and a completely stirred tank reactor (CSTR) system, was simulated in order to detect the simultaneous removal of kemicetine (chloramphenicol) and nutrients. The outlet of the aerobic reactor was sequentially used as the feed of the anoxic one, while the aerobic CSTR reactor was fed with its effluent. The phosphorus uptake and nitrification was excessively determined in the aerobic CSTR reactor. The volumetric loading rates of kemicetine increased from 50 mg L-1.day(-1) to 500 mg L-1 resulting in higher COD conversion rates (83-97) and methane production (400-1600 ml day(-1)) in the anaerobic reactor. NO3-N was removed via denitrification in the anoxic reactor, while PO4-P was removed in the aerobic one, at kemicetine loading rates from 50 to 500 mg L-1.day(-1). The UASB and anoxic UASB reactor effluents were less toxic relatively to the influent, when analyzed by anaerobic toxicity tests (ATA) and specific methanogenic activity tests (SMA), indicating that such anaerobic/anoxic aerobic sequential treatments could be able to reduce the antibiotic together with nutrient removal.