Evaluation of Biogas Production Yields of Different Waste Materials

Abstract

Biogas production from three different sources namely, cattle manure, cheese whey and blood, which have different characteristics, were investigated comparatively. Biogas production rates of 0.63, 0,72 and 0,64 l min PO were observed in 30 days of digestion of manure. The amount of total nitrogen (Tot-N) decreased 10% in 30 days of digestion but ammonium-nitrogen (Am-N) increased 46% at the same duration of time. Manure, during co-digestion, buffered and inoculated the cheese whey and blood, and converted them to the energy source. An average COD removal of 52% or 34% is also possible during co-digestion of cheese whey or blood with manure.

The effect of organic loading rates (OLRs) on the performances of food wastes and maize husks anaerobic co-digestion in continuous mode

“…The least performed digester is digester E with 100% MH. This abysmal performance obtained in digester B could be linked to the high C/N ratio (Table 1), above the recommended limit of 20-35 [9,23] and higher lignin content [16]. While high C/N ratio results in acidification which inhibits methanogenic activities ( [23]), high lignin content inhibits initial hydrolysis of substrates.…”

Optimal combination of food waste and maize husk for enhancement of biogas production: Experimental and modelling study

“…Digester B was found to have higher biogas yield than the other digesters, followed by digester C. The least performed digester is digester E with 100% MH. This could have resulted from the very high C/N ratio, above the recommended limit of 20-35 (Ghasimi et al, 2009;Ozturk, 2013), and higher lignin content (Momoh and Nwaogazie, 2011). While very high C/N ratio results in acidification which inhibits methanogenic activities (Ozturk, 2013), high lignin content inhibits initial hydrolysis of substrates (Momoh and Nwaogazie, 2011) After the 44 days of digestion, total biogas produced for digesters A, B, C, D and E was found to be 11.10, 15.64, 11.84, 6.65, and 5.24 L/gVS respectively (Fig.…”

Anaerobic Digestion of Blood from Slaughtered Livestock: A Review

“…Ozturk [91] investigated AD of blood as a mono-substrate in semi-continuous 3.6 m 3 working volume continuously mixed digester operated at 35 • C with an HRT of 18 days. No methane was observed, but a strong offensive odor was produced; therefore, it was concluded that AD of blood alone is difficult, and feeding another organic waste as a co-digestate is suggested.…”

“…Integrating the concepts of co-digestion and dilution, Ozturk [91] co-digested cattle blood:cattle manure:water (30:20:50 mass ratio) in a semi-continuous 3.6 m 3 working volume continuously mixed digester operated at 35 • C with an HRT of 18 days. They reported a biogas production rate of 0.64 L min −1 m −3 with a COD removal of 34% in a 30-day study.…”

“…Another issue is the production of sulfides upon the degradation of sulfur-containing proteins. Sulfides are toxic, corrosive, and generate a strong unpleasant odor [91] during the AD of blood. The odor is attributed mainly to hydrogen sulfide (H 2 S), which has the odor of rotten eggs.…”