Anaerobic digestion of dairy manure with enhanced ammonia removal

Uludag-Demirer, S.
Demirer, Göksel Niyazi
Frear, C.
Chen, S.
Poor ammonia-nitrogen removal in methanogenic anaerobic reactors digesting animal manure has been reported as an important disadvantage of anaerobic digestion (AD) in several studies. Development of anaerobic processes that are capable of producing reduced ammonia-nitrogen levels in their effluent is one of the areas where further research must be pursued if AD technology is to be made more effective and economically advantageous. One approach to removing ammonia from anaerobically digested effluents is the forced precipitation of magnesium ammonium phosphate hexahydrate (MgNH4PO4-6H(2)O), commonly called struvite. Struvite is a valuable plant nutrient source for nitrogen and phosphorus since it releases them slowly and has non-burning features because of its low solubility in water. This study investigated coupling AD and controlled struvite precipitation in the same reactor to minimize the nitrogen removal costs and possibly increase the performance of the AD by reducing the ammonia concentration which has an adverse effect oil anaerobic bacteria. The results indicated that Lip to 19% extra COD and almost 11% extra NH3 removals were achieved relative to a control by adding 1750 mg/L of MgCl2-6H(2)O to the anaerobic reactor.


Removal and recovery of nutrients as struvite from anaerobic digestion/co-digestion residues of poultry manure
Yılmazel, Yasemin Dilşad; Demirer, Göksel Niyazi; Department of Environmental Engineering (2009)
The main objective of this study was to investigate the removal and recovery of nutrients from anaerobic digestion residues of poultry manure through struvite (MgNH4PO4.6H2O, MAP) precipitation. To this purpose, three sets of laboratory experiments were conducted. In the first set, separate and co-digestion of poultry manure and sewage sludge were studied in laboratory-scale mesophilic anaerobic batch reactors and subsequent struvite precipitation experiments were conducted with the reactors effluents. The ...
Anaerobic biogasification of undiluted dairy manure in leaching bed reactors
Demirer, Göksel Niyazi; Chen, S. (Elsevier BV, 2008-01-01)
Dry anaerobic digestion of high solids animal manure is of increasing importance since conventional slurry digestion is not an effective system for these manures. The investment costs for large-size reactors, costs for heating these reactors, handling, dewatering, and the disposal of the digested residue decrease the benefits of conventional slurry anaerobic digestion for high solids animal manure. Even though leaching bed reactors (LBR) constitute a promising option for dry anaerobic biogasification of ani...
Anaerobic digestion of dairy manure in a hybrid reactor with biogas recirculation
Demirer, Göksel Niyazi; Chen, SL (2005-12-01)
A novel anaerobic hybrid reactor (AHR) configuration incorporating floating support media for biomass immobilization and biogas recirculation for enhanced mixing was used for anaerobic digestion of dairy manure. No pretreatment or solid liquid separation was applied. The reactor was operated at high influent volatile solids (VS) and organic loading rates (OLR) of up to 9.87% and 7.30 g VS/l day, respectively. After 149 days of continuous operation the results revealed that a high amount (38.1 g VSS) of biom...
Anaerobic mesophilic co-digestion of sugar-beet processing wastewater and beet-pulp in batch reactors
Alkaya, Emrah; Demirer, Göksel Niyazi (2011-03-01)
In this study, biochemical methane potential (BMP) assay was conducted to investigate the effect of waste mixing and F/M ratio on the co-digestion of wastewater and beet-pulp, in addition to the digestion of the wastes separately. In the studied F/M range (0.51–2.56 g COD/g VSS), observed treatment efficiencies (63.7–87.3% COD removal and 69.6–89.3% VS reduction) were indications of high biodegradability for both wastewater and beet-pulp, which decreased with increasing F/M. It was evident that the extent o...
Odabaş, Yasin; Yılmazel Tokel, Yasemin Dilşad; Department of Environmental Engineering (2022-11)
In this study we investigated the impact of granular activated carbon (GAC) application on anaerobic digestion (AD) process of cattle manure. Firstly, the effect of the presence of basal medium on cattle manure digestion was evaluated. It was observed that basal medium addition decreased methane yield and increased lag time. Then, for the enhanced cattle manure digestion, a metal-based conductive material, hematite (Fe2O3), and carbon-based material, GAC, were amended into the reactors. From the comparison ...
Citation Formats
S. Uludag-Demirer, G. N. Demirer, C. Frear, and S. Chen, “Anaerobic digestion of dairy manure with enhanced ammonia removal,” JOURNAL OF ENVIRONMENTAL MANAGEMENT, pp. 193–200, 2008, Accessed: 00, 2020. [Online]. Available: