Effect of NH3 and organic loading on the inhibition of mesophilic digestion
The construction of infrastructure for anaerobic digestion is highly cost intensive and depends mainly on the size of the digesters.Savings in digester volume can be achieved by lowering the water content of accruing sludge and operating the digester at high solid concentration.This leads to a higher organic loading rate to the digesters with correspondingly higher ammonium and ammonia concentrations due to hydrolysis of organic compounds.In this study,the performance of mesophilic anaerobic digestion at high ammonium concentration due to higher total suspended solids in the feed sludge was observed.The emphasis was on process stability and biodegradation.In a first step,urea was dosed to increase the NH4-N load.In a second period of investigation,sludge from a static thickener was further dewatered to get to the relevant range of ammonium concentration as well as typical organic loading rate.It has been shown that NH4-N concentrations up to 2057 mg L-1 led to no inhibition ofbiomass.Further increasing NH4-N concentrations caused an accumulation of organic acids with deteriorating biodegradation although a stable process was observed.It was concluded that dewatering of feeding sludge up to 7 % TSS concentration leads to an optimum of benefit with maximum savings in digester volume and no deterioration of biodegradation at all.
Anaerobic digestion high total solid concentration high ammonium concentration inhibition
Thomas Baumgartner Lydia Jahn Karl Svardal J(o)rg Krampe
Institute for Water Quality, Resources and Waste Management, TU Wien-Vienna University of Technology Karlsplatz 13/226, A-1040 Wien, Austria
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
146-149
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）