Five laboratory-scale studies were setup to investigate the effects of dromedary dung (DD) co-dig... more Five laboratory-scale studies were setup to investigate the effects of dromedary dung (DD) co-digestion with kitchen waste (KW) and sewage sludge water (SSW) at five ratios, under mesophilic conditions (31-35°C) by examining operation stability, CH 4 and biogas production potentials. The result obtained showed that KWDDSSW produced the highest CH 4 content (64.51%), followed by DDSSW (51.37%) and DDKW (34.77%). The daily CH 4 production was linearly correlated with pH, high volatile solids and COD degradation in the feedstock, indicating methane production was probably associated with higher supply of organic carbon source that favored the growth of active biomass. KWDDSSW and DDSSW were favored in terms of volume of flammable gas production of biogas and flamed on the 8 th day. This study is being the first attempt on CH 4 production of combined wastes with DD of Algeria.
The genus Lavandula (common name Lavender) involves 39 species of flowering plants in the Lamiace... more The genus Lavandula (common name Lavender) involves 39 species of flowering plants in the Lamiaceae family. The present study deals with the antioxidant activity of three different solvent extracts of Lavandula coronopifolia that grows in Hoggar (Tamanrasset) south of Algeria. The radical scavenging potential was determined on basis of the activity of trapping the stable 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical. The values of IC 50 (mg/mL) were found to be 0.0347g/L, 0.0414g/L and 0.0910g/L for diethyl ether, ethyl acetate and n-Butanol extracts respectively, compared to the ascorbic acid (VC) and the tocopherol acid (VE) which were 0.0088g/L and 0.0154 g/L respectively. Moreover, the FRAP (Ferric reducing antioxidant power) assay was carried out and revealed a better efficacy of ethyl acetate extract than the other extracts. By using VCEAC (Vitamin C Equivalent Antioxidant Capacity), it is found that the reduction percentages are: 0.90 g/L, 0.680 g/L and 0.304 g/L for Diethyl ether, Acetate ethyl and n-Butanol respectively. The ascorbic acid (VC) considered, as a positive test has a VCEAC of 1.223g/L.
Biogas and biofertilizer production from anaerobic digestion of local organic solid waste in Alge... more Biogas and biofertilizer production from anaerobic digestion of local organic solid waste in Algeria is an attractive choice for greener and cleaner environment. In this paper, the study focused on the effect of co-digestion of municipal solid organic wastes (MSW) and camel dung (CD) for the quality production of biogas (methane) and bio fertilizer products. The concentration of methane production is the preeminent aim of this work. The experiment was set by feedstocks preparation where organic waste was mixed with tap water at 1:1 ratio and it allowed to digest at temperature of 40 °C. The operating hydraulic retention time (HRT) was set at 35 days. Physicochemical properties of feedstocks and constituent elements of the digestate were determined by American Public Health Association methods. The experimental study indicated that underdefined operational conditions such as constant organic loading rate (OLR) of 0.6 kg per day, hydraulic retention time (HRT) of 35 days and temperature of 40C from MSW and MSW and CD mixtures of ratio at one to one resulted in a higher methane production (57.3%) compared to mono-digestion of camel dung that produced 45.6% of CH4) in a pH range between 7.0 to 8.1. The improvement has also found related to high biodegradability of the MSW, the slight ammonium concentration, the optimization of the carbon-to-nitrogen ratio (C/N 25.8:1) and to the well-balanced nutrients content of the feedstock. The digestate coming from anaerobic co-digestion has also used as bio-fertilizer and this by-product has a benefit to avoid the harmful effect in the digester system and in the surrounding environment. It is shown clearly that the MSW and CD are highly desirable substrates for anaerobic co-digestion with regards to their good biodegradability, high methane yield and good bio-fertilizer quality
Five laboratory-scale studies were setup to investigate the effects of dromedary dung (DD) co-dig... more Five laboratory-scale studies were setup to investigate the effects of dromedary dung (DD) co-digestion with kitchen waste (KW) and sewage sludge water (SSW) at five ratios, under mesophilic conditions (31-35°C) by examining operation stability, CH 4 and biogas production potentials. The result obtained showed that KWDDSSW produced the highest CH 4 content (64.51%), followed by DDSSW (51.37%) and DDKW (34.77%). The daily CH 4 production was linearly correlated with pH, high volatile solids and COD degradation in the feedstock, indicating methane production was probably associated with higher supply of organic carbon source that favored the growth of active biomass. KWDDSSW and DDSSW were favored in terms of volume of flammable gas production of biogas and flamed on the 8 th day. This study is being the first attempt on CH 4 production of combined wastes with DD of Algeria.
The genus Lavandula (common name Lavender) involves 39 species of flowering plants in the Lamiace... more The genus Lavandula (common name Lavender) involves 39 species of flowering plants in the Lamiaceae family. The present study deals with the antioxidant activity of three different solvent extracts of Lavandula coronopifolia that grows in Hoggar (Tamanrasset) south of Algeria. The radical scavenging potential was determined on basis of the activity of trapping the stable 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical. The values of IC 50 (mg/mL) were found to be 0.0347g/L, 0.0414g/L and 0.0910g/L for diethyl ether, ethyl acetate and n-Butanol extracts respectively, compared to the ascorbic acid (VC) and the tocopherol acid (VE) which were 0.0088g/L and 0.0154 g/L respectively. Moreover, the FRAP (Ferric reducing antioxidant power) assay was carried out and revealed a better efficacy of ethyl acetate extract than the other extracts. By using VCEAC (Vitamin C Equivalent Antioxidant Capacity), it is found that the reduction percentages are: 0.90 g/L, 0.680 g/L and 0.304 g/L for Diethyl ether, Acetate ethyl and n-Butanol respectively. The ascorbic acid (VC) considered, as a positive test has a VCEAC of 1.223g/L.
Biogas and biofertilizer production from anaerobic digestion of local organic solid waste in Alge... more Biogas and biofertilizer production from anaerobic digestion of local organic solid waste in Algeria is an attractive choice for greener and cleaner environment. In this paper, the study focused on the effect of co-digestion of municipal solid organic wastes (MSW) and camel dung (CD) for the quality production of biogas (methane) and bio fertilizer products. The concentration of methane production is the preeminent aim of this work. The experiment was set by feedstocks preparation where organic waste was mixed with tap water at 1:1 ratio and it allowed to digest at temperature of 40 °C. The operating hydraulic retention time (HRT) was set at 35 days. Physicochemical properties of feedstocks and constituent elements of the digestate were determined by American Public Health Association methods. The experimental study indicated that underdefined operational conditions such as constant organic loading rate (OLR) of 0.6 kg per day, hydraulic retention time (HRT) of 35 days and temperature of 40C from MSW and MSW and CD mixtures of ratio at one to one resulted in a higher methane production (57.3%) compared to mono-digestion of camel dung that produced 45.6% of CH4) in a pH range between 7.0 to 8.1. The improvement has also found related to high biodegradability of the MSW, the slight ammonium concentration, the optimization of the carbon-to-nitrogen ratio (C/N 25.8:1) and to the well-balanced nutrients content of the feedstock. The digestate coming from anaerobic co-digestion has also used as bio-fertilizer and this by-product has a benefit to avoid the harmful effect in the digester system and in the surrounding environment. It is shown clearly that the MSW and CD are highly desirable substrates for anaerobic co-digestion with regards to their good biodegradability, high methane yield and good bio-fertilizer quality
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