Effect of High Ammonia Concentration on UASB Reactor Treating Sanitary Landfill Leachate

Abstract

Landfill leachate always contains high amounts of organic and inorganic waste which make its treatment hard. Combined biological and chemical treatment methods should be used to reduce high pollution loads to the discharge limits. Anaerobic digestion is the ideal method for removal of high organic carbon loads. However many inhibitory substances adversely affect the process stability and methane yield. High free ammonia concentration is primary cause of inhibition in anaerobic treatment. In this study leachate coming from Istanbul Komurcuoda Landfill was treated with upflow anaerobic sludge bed (UASB) reactor for 600 days. After inoculation of reactor, influent ammonia concentration was gradually increased from 100 mg/L to 2800 mg/L in order to observe the free ammonia effect on anaerobic treatment. Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD) removal efficiencies decreased gradually from 95% to 15% while ammonia concentration was increased. Although anaerobic bacteria have been adapted to ammonia concentration, inhibitory effect of ammonia was observed at 1000 mg/L ammonia concentration.

Keywords

• Leachate; Anaerobic Treatment; Free Ammonia Inhibition; UASB

Yüksek Amonyak Konsantrasyonunun Katı Atık Düzenli Depo Sahası Sızıntı Suyunu Arıtan YAÇY Reaktörü Üzerindeki Etkisi

Abstract

Katı atık düzenli depo sahası sızıntı suyu her zaman arıtımını zorlaştıran yüksek miktarlarda organik ve inorganik atık içerir. Yüksek kirlilik yüklerini deşarj limitlerine kadar azaltmak için birleşik biyolojik ve kimyasal arıtma metotları kullanılması gerekir. Anaerobik parçalanma yüksek organik karbon yüklerinin giderimi için ideal bir metottur. Fakat birçok inhibitör madde prosesin kararlılığını ve metan üretimini olumsuz etkilemektedir. Yüksek serbest amonyak konsantrasyonu anaerobik arıtımda inhibisyonun birincil sebebidir. Bu çalışmada İstanbul Kömürcüoda Katı Atık Düzenli Depo Sahasından gelen sızıntı suyu yukarı akışlı çamur yatağı (YAÇY) reaktör ile 600 gün arıtılmıştır. Reaktörün aşılanmasından sonra, giriş amonyak konsantrasyonu anaerobik arıtımda serbest amonyak etkisini gözlemlemek için 100 mg/L den 2800 mg/L ye kademeli olarak arttırılmıştır. Amonyak konsantrasyonu arttırılırken, Kimyasal Oksijen İhtiyacı (KOİ) ve Biyokimyasal Oksijen İhtiyacı (BOİ) giderim verimleri %95 ten %15 e kadar kademeli olarak azalmıştır. Anaerobik bakteriler amonyak konsantrasyonuna adapte edilmelerine rağmen, amonyağın inhibitör etkisi 1000 mg/L amonyak konsantrasyonunda gözlemlenmiştir.

Keywords

• Sızıntı Suyu, Anaerobik Arıtım, Serbest Amonyak İnhibisyonu, YAÇY

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