Atıksulardaki sülfat konsantrasyonunun yukarı akışlı anaerobik çamur yatağı sistem verimine etkisi

Bu çalışmada, atıksudaki farklı sülfat konsantrasyonlarının sistem verimine etkilerini araştırmak için pilot ölçekli bir yukarı akışjı havasız çamur yatağı (YAHÇY) kullanılmıştır. 40 günlük alıştırma devresinin ardından YAHÇY, 83 gün süresince mezofilik-anaerobik şartlarda, 2 günlük hidrolik bekleme süresinde işletmeye alınmıştır. Sistem verimini araştırmak için belirli aralıklarla sülfat konsantrasyonu arttırılmıştır. Sülfat konsantrasyonu 300 mg/L'nin altındayken % 90'm üzerinde KOİ ve % 30-40 oranında sülfat verimi sağlanmıştır. 600 mg/L sülfat konsantrasyonunda, KOİ verimi % 60-80 arasında kalmıştır. 1500 mg/L'nin üzerindeki sülfat konsantrasyonu ile yapılan çalışmalarda, KOİ giderimi (< % 60) ve metan üretiminin (< 1,2 L) etkili bir şekilde azaldığı belirlenmiştir. Aynı zamanda giderilen KOİ'nin metana dönüşüm oranının 0.395'ten 0.200 L CH/g KOİ(gid.) değerine düştüğü kaydedildi. KOİ/SO oranının 12'nin altına düşmesi durumunda ise 4 4 üretilen metan miktarı % 50 azalmıştır.

Effect of sulfate concentrations in wastewaters on up-flow anaerobic sludge bed reactor system performance

In this study, an Up-flow anaerobic sludge bed (UASB) reactor was used to investigate effects of sulfate concentrations in wastewater on the system performance. Following the start-up period of first 40 days, UASB reactor was operated in mesophilic-anaerobic conditions during the 83 days with a constant hydraulic retention time of 2 days. Sulfate concentration was gradually increased to investigate its effect on the performance. It has been found that over 90% COD and 30-40% sulfate removal could be obtained when sulfate concentration was less than 300 mg/1. COD removal performance decreased to 60-80 % with sulfate concentration of 600 mg/1. In the high sulfate concentrations over 1500 mg/1, methane yield decreased considerably and the rate of COD removal (

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