Leachate Recirculation for Enhancing Methane Generation within Field Site in China

Abstract

Leachate recirculation is a critical element in the evaluation of the availability of methane production enhancement in bioreactor landfills. Field experiments in leachate injection were conducted in horizontal wells at a landfill in Hubei Province in China. The experiments included the long-term test of methane concentration and production in three cells; the test was operated with nonrecirculation (NR), continued recirculation (CR), and descending recirculation (DR). The average methane concentration in CR is 54.8%, which is higher than that in the NR and DR sites. The average biogas flow rate in the CR site was 2.2 times that in the NR site. The recirculation loading should be determined with the specific conditions, to effectively improve the methane production in field site. The position of the gas collection well was also very important, coordinating with the distribution of the leachate injection well and influence area of the liquid injection. The long-term monitoring of injection volume and gas production is essential to determine the reliability of recirculation for methane reuse.

Mathematical Investigation for Two-Bacteria Competition in Presence of a Pathogen With Leachate Recirculation

“…Leachate recirculation is an effective methods increasing organic matter conversion and improve bioprocess stability in a bioreactor [5,6]. The rate of microbial degradation increases with the organic solution leading to high methane production.…”

Düzenli Depolama Alanlarından Sızıntı Suyunun Mikrodalga Işınlama ile Arıtılmasına Genel Bakış

“…Özellikle büyük ölçekli depolama alanlarında, sızıntı suyu içeriğindeki organik madde yükseldiğinde, mikrobiyal parçalanma hızı artar ve sonuçta yüksek CH 4 hacmi ile enerji üretimi iyileşir, emisyon azalımı ve geri kazanım sağlar. Sızıntı suyu geri devri ile atık yapısında CH 4 üretim hızı %15'ten %700'e çıkarılabilmektedir [58]. İstanbul Odayeri çöp deponi alanında yapılan çalışmada geri devir ile metanojenik aktivitedeki artış sonucu oluşan biyogaz CH 4 fraksiyonunda yaklaşık %10 artışa neden olduğu belirlenmiştir [59].…”

Challenges and Opportunities in implementing leachate recirculation in Indonesia: technical aspects

“…Annual rainfall in Indonesia ranges from 500-3,000 mm [22]. Biogas production with a high methane content> 70% on the one hand is a significant advantage from an energy perspective, but on the other hand requires the adoption of appropriate safety measures to prevent the formation of explosive methane and oxygen blends [23,24]. The amount of gas will decrease with increasing age of the landfill.…”