This study tested the effect on thermophilic and mesophilic digestion of poultry manure (PM) or t... more This study tested the effect on thermophilic and mesophilic digestion of poultry manure (PM) or treated poultry manure (TPM) by the addition of agriculture wastes (AWS) as a co-substrate under dry conditions. PM was co-digested with a mixture of AWS consisting of coconut waste, cassava waste, and coffee grounds. Results were increased methane content in biogas, with decreased ammonia accumulation and volatile acids. The highest performance occurred under mesophilic conditions, with a 63 and 41.3 % increase in methane production from addition of AWS to TPM (562 vs. 344 mL g VS(-1) from control) and PM (406 vs. 287 mL g VS(-1) from control), respectively. Thermophilic conditions showed lower performance than mesophilic conditions. Addition of AWS increased methane production by 150 and 69.6 % from PM (323.4 vs. 129 mL g VS(-1) from control) and TPM (297.6 vs. 175.5 mL g VS(-1) from control), respectively. In all experiments, 100 % acetate produced was degraded to methane. Maximum ammonia accumulation was lowered to 43.7 % by mixing of AWS (range 5.35-8.55 vs. 7.81-12.28 g N kg(-1) bed). The pH was held at 7.3-8.8, a range suitable for methanogenesis.
Aim: This study assessed the impact of four water sources used as drinking water in Egypt for bro... more Aim: This study assessed the impact of four water sources used as drinking water in Egypt for broiler chickens on its performance, carcass characteristic, hematological, and immunological responses. Materials and Methods: A total of 204 unsexed 1-day old Indian River broiler chickens were used in this study. They were randomly allocated into four treatment groups of 51 birds in each, with three replicates, 17 birds per replicate. Groups were classified according to water source they had been received into (T1) received farm tap water; (T2) received filtered tap water (T3) received farm stored water at rooftop tanks, (T4) received underground (well) water. Results: All water sources showed no significant differences among treated groups at (p>0.05) for most of the performance parameters and carcass characteristics. However (T2) group showed higher records for body weight (BWT), BWT gain (BWG), feed conversion ratio, bursa weight, serum total protein, globulin (G), albumin (A) and ...
The dry fermentation of chicken manure (CM) for production of methane in mesophilic conditions at... more The dry fermentation of chicken manure (CM) for production of methane in mesophilic conditions at 37 degrees C was studied under laboratory conditions using a repeated batch culture system. Methane was successfully produced after an acclimation period of about 254 d. A total volume of 4.4 l kg(-1) CM (31 ml g(-1)VS) of methane gas was produced, despite the presence of a high level of ammonia of ca. 8 to 14 g-N kg(-1) CM. This clearly demonstrates that spontaneous acclimation of the methanogenic consortia to high levels of ammonia could occur and result in production of methane even under a high percentage of total solid (25%) and a high level of ammonia.
This study demonstrates methane fermentation that was carried out along with ammonia striping to ... more This study demonstrates methane fermentation that was carried out along with ammonia striping to avoid ammonia accumulation that significantly inhibited methane production. Ammonia was successfully removed by means of recycling of biogas followed by gas washing in sulfuric acid to capture ammonia, when chicken manure was anaerobically digested for 4 days at 55 degrees C and at an initial pH of 8-9. By using this method, 80% of total nitrogen in chicken manure was converted to ammonia and 82% of the produced ammonia was removed. A bench scale reactor equipped with an ammonia-stripping unit for methane production from chicken manure was developed and operated in repeated batch mode. At an initial pH of 8 and at 55 degrees C, 195 and 157 ml g-VS(-1) of methane was successfully produced from the treated chicken manure and the mixture of treated chicken manure and raw chicken manure in the ratio of 1:1, respectively. In this method, ammonia concentration was maintained at a level lower than 2g-N kg-wet sludge(-1) in the reactor.
Co-digestion of chicken manure and agricultural wastes was used to improve methane production. Se... more Co-digestion of chicken manure and agricultural wastes was used to improve methane production. Semisolid material (10% TS) was used at the thermophilic and mesophilic laboratory conditions. Co-digestion resulted in increase of the methane production by 93% (e.g. 695 mL g À1 VS). Ammonia accumulation was reduced by 39%, while 100% of acetate produced was degraded to methane. a b s t r a c t The potential for methane production from semi-solid chicken manure (CM) and mixture of agricultural wastes (AWS) in a co-digestion process has been experimentally evaluated at thermophilic and mesophilic temperatures. To the best of author ' s knowledge, it is the first time that CM is co-digested with mixture of AWS consisting of coconut waste, cassava waste, and coffee grounds. Two types of anaer-obic digestion processes (AD process) were used, process 1 (P1) using fresh CM (FCM) and process 2 (P2) using treated CM (TCM), ammonia stripped CM, were conducted. Methane production in P1 was increased by 93% and 50% compared to control (no AWS added) with maximum methane production of 502 and 506 mL g À1 VS obtained at 55 °C and 35 °C, respectively. Additionally, 42% increase in methane production was observed with maximum volume of 695 mL g À1 VS comparing P2 test with P2 control under 55 °C. Ammonia accumulation was reduced by 39% and 32% in P1 and P2 tests.
This study tested the effect on thermophilic and mesophilic digestion of poultry manure (PM) or t... more This study tested the effect on thermophilic and mesophilic digestion of poultry manure (PM) or treated poultry manure (TPM) by the addition of agriculture wastes (AWS) as a co-substrate under dry conditions. PM was co-digested with a mixture of AWS consisting of coconut waste, cassava waste, and coffee grounds. Results were increased methane content in biogas, with decreased ammonia accumulation and volatile acids. The highest performance occurred under mesophilic conditions, with a 63 and 41.3 % increase in methane production from addition of AWS to TPM (562 vs. 344 mL g VS(-1) from control) and PM (406 vs. 287 mL g VS(-1) from control), respectively. Thermophilic conditions showed lower performance than mesophilic conditions. Addition of AWS increased methane production by 150 and 69.6 % from PM (323.4 vs. 129 mL g VS(-1) from control) and TPM (297.6 vs. 175.5 mL g VS(-1) from control), respectively. In all experiments, 100 % acetate produced was degraded to methane. Maximum ammonia accumulation was lowered to 43.7 % by mixing of AWS (range 5.35-8.55 vs. 7.81-12.28 g N kg(-1) bed). The pH was held at 7.3-8.8, a range suitable for methanogenesis.
Aim: This study assessed the impact of four water sources used as drinking water in Egypt for bro... more Aim: This study assessed the impact of four water sources used as drinking water in Egypt for broiler chickens on its performance, carcass characteristic, hematological, and immunological responses. Materials and Methods: A total of 204 unsexed 1-day old Indian River broiler chickens were used in this study. They were randomly allocated into four treatment groups of 51 birds in each, with three replicates, 17 birds per replicate. Groups were classified according to water source they had been received into (T1) received farm tap water; (T2) received filtered tap water (T3) received farm stored water at rooftop tanks, (T4) received underground (well) water. Results: All water sources showed no significant differences among treated groups at (p>0.05) for most of the performance parameters and carcass characteristics. However (T2) group showed higher records for body weight (BWT), BWT gain (BWG), feed conversion ratio, bursa weight, serum total protein, globulin (G), albumin (A) and ...
The dry fermentation of chicken manure (CM) for production of methane in mesophilic conditions at... more The dry fermentation of chicken manure (CM) for production of methane in mesophilic conditions at 37 degrees C was studied under laboratory conditions using a repeated batch culture system. Methane was successfully produced after an acclimation period of about 254 d. A total volume of 4.4 l kg(-1) CM (31 ml g(-1)VS) of methane gas was produced, despite the presence of a high level of ammonia of ca. 8 to 14 g-N kg(-1) CM. This clearly demonstrates that spontaneous acclimation of the methanogenic consortia to high levels of ammonia could occur and result in production of methane even under a high percentage of total solid (25%) and a high level of ammonia.
This study demonstrates methane fermentation that was carried out along with ammonia striping to ... more This study demonstrates methane fermentation that was carried out along with ammonia striping to avoid ammonia accumulation that significantly inhibited methane production. Ammonia was successfully removed by means of recycling of biogas followed by gas washing in sulfuric acid to capture ammonia, when chicken manure was anaerobically digested for 4 days at 55 degrees C and at an initial pH of 8-9. By using this method, 80% of total nitrogen in chicken manure was converted to ammonia and 82% of the produced ammonia was removed. A bench scale reactor equipped with an ammonia-stripping unit for methane production from chicken manure was developed and operated in repeated batch mode. At an initial pH of 8 and at 55 degrees C, 195 and 157 ml g-VS(-1) of methane was successfully produced from the treated chicken manure and the mixture of treated chicken manure and raw chicken manure in the ratio of 1:1, respectively. In this method, ammonia concentration was maintained at a level lower than 2g-N kg-wet sludge(-1) in the reactor.
Co-digestion of chicken manure and agricultural wastes was used to improve methane production. Se... more Co-digestion of chicken manure and agricultural wastes was used to improve methane production. Semisolid material (10% TS) was used at the thermophilic and mesophilic laboratory conditions. Co-digestion resulted in increase of the methane production by 93% (e.g. 695 mL g À1 VS). Ammonia accumulation was reduced by 39%, while 100% of acetate produced was degraded to methane. a b s t r a c t The potential for methane production from semi-solid chicken manure (CM) and mixture of agricultural wastes (AWS) in a co-digestion process has been experimentally evaluated at thermophilic and mesophilic temperatures. To the best of author ' s knowledge, it is the first time that CM is co-digested with mixture of AWS consisting of coconut waste, cassava waste, and coffee grounds. Two types of anaer-obic digestion processes (AD process) were used, process 1 (P1) using fresh CM (FCM) and process 2 (P2) using treated CM (TCM), ammonia stripped CM, were conducted. Methane production in P1 was increased by 93% and 50% compared to control (no AWS added) with maximum methane production of 502 and 506 mL g À1 VS obtained at 55 °C and 35 °C, respectively. Additionally, 42% increase in methane production was observed with maximum volume of 695 mL g À1 VS comparing P2 test with P2 control under 55 °C. Ammonia accumulation was reduced by 39% and 32% in P1 and P2 tests.
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Papers by Fatma A Abouelenien