The effects of fly ash-containing sludge amendment on nitrogen content and urease activity of soils

Topac F. O., Baskaya H. S., Alkan U.

FRESENIUS ENVIRONMENTAL BULLETIN, cilt.16, sa.5, ss.532-536, 2007 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 16 Sayı: 5
  • Basım Tarihi: 2007
  • Dergi Adı: FRESENIUS ENVIRONMENTAL BULLETIN
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.532-536
  • Anahtar Kelimeler: fly ash, nitrogen, soil, urease activity, wastewater sludge, SEWAGE-SLUDGE, STABILIZATION, WASTES
  • Bursa Uludağ Üniversitesi Adresli: Evet

Özet

The present study was undertaken to demonstrate the effects of fly-ash addition to sludges on nitrogen content and urease activity of soils. Wastewater sludges added with varying doses of fly-ash (40, 80 and 120%, on dry weight basis) were amended to a clay soil, and the variations in ammonium, nitrate and total nitrogen contents and urease activities were monitored during incubation at 28 degrees C for 360 days. Co-application of fly-ash and wastewater sludge, especially at the dose of 120 % fly-ash, caused an initial decrease in inorganic nitrogen and urease activity levels in contradiction to sludge-only application. However, after the first 3 months of incubation, this adverse effect almost disappeared. Application of fly-ash/sludge mixture to soil with appropriate dosages (< 120%) may not affect the microbiological processes occurring in soil system.