Anaerobic Treatability of Sanitary Landfill Leachate in a Fluidized Bed Reactor

Authors : Hakkı GÜLŞEN, Mustafa TURAN

Pages : 297-306

Doi:10.3906/sag-1206-98

View : 14 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The treatability of leachate from Odayeri Sanitary Landfill, located in the European part of İstanbul, in an anaerobic fluidized bed reactor insert ignore into journalissuearticles values(AFBR); was investigated. The experiments were performed in a pilot-scale fluidized bed reactor having an inner diameter of 10 cm, a height of 165 cm and an effective volume of 13 l. The reactor medium was a typical filter sand having an arithmetic mean diameter of 0.5 mm and a fixed bed height of 70 cm. The AFBR experiments were carried out by increasing gradually the organic loading rate insert ignore into journalissuearticles values(OLR); from 2.5 to 37 kg COD/m3 per day in 8 operating steps. During the 240 days of operation, the feed rate insert ignore into journalissuearticles values(Qf); and the hydraulic retention time insert ignore into journalissuearticles values(HRT); were 13 l/day and 1 day, respectively. The measured variables were chemical oxygen demand insert ignore into journalissuearticles values(COD);, alkalinity, pH, volatile and suspended solids, ammonia, and gas rates. Ammonia removal efficiency appeared to be very low. However, ammonia inhibition has not occured during the study. COD removal increased from 80% to 90 % with increasing organic loading rates and the AFBR attained steady state conditions with a COD removal of 90% after 80 days. A good biogas production yield insert ignore into journalissuearticles values(Ygas); was obtained; 0.50-0.52 l of biogas per g CODrem with a methane insert ignore into journalissuearticles values(CH4); content of 75%. The attached biomass concentration insert ignore into journalissuearticles values(Xatt); comprised about 90% of the total biomass concentration and showed an increase throughout the bed in the range of 3 to 38%. The mean attached biomass concentration also increased up to 70,000 mg/l in the last 2 months insert ignore into journalissuearticles values(for days 164-220);.
Keywords : Anaerobic treatability, Biogas production, Fluidized bed reactor, Landfill leachate, Organic loading, Process efficiency