To realize full energy recovery from grass and chicken manure(CM), the integration of high-solid anaerobic digestion(HSAD) and gasification was investigated experimentally. The anaerobic biodegradability of grass can ...To realize full energy recovery from grass and chicken manure(CM), the integration of high-solid anaerobic digestion(HSAD) and gasification was investigated experimentally. The anaerobic biodegradability of grass can be enhanced through codigestion with CM. When the volatile solid(VS) ratio of CM to grass was 20:80, C/N ratio calculated to be 21.70, the cumulative biogas yield was the highest, 237 ml·(g VS)^(-1). The enhancement of biogas production was attributed to the buffering effects of ammonia and rich trace elements in CM. In semi-continuous systems, when the organic loading rate was 4.0 g VS·L^(-1)·d^(-1), the HSAD process was stable, with the average biogas yield 168 ml·(g VS)^(-1). More than 80% fractions of the digestates were volatile matters, which meant that the digestates can be used as feedstock for gasification to produce syngas. The VS ratio of grass to CM had significant overall energy generation through HSAD and gasification. Compared with gasification of digestate,cogasification with woodchips increased syngas yield and low heat value(LHV). Increasing of mass ratio of digestates to woodchips led to the decrease of LHV.展开更多
This study aimed to explore the optimal material ratio for composting of horticultural waste,which was expected to improve the utilization rate of this waste.To be specific,horticultural waste and edible fungus residu...This study aimed to explore the optimal material ratio for composting of horticultural waste,which was expected to improve the utilization rate of this waste.To be specific,horticultural waste and edible fungus residue were mixed with pig manure,rapeseed cake,or compound fertilizer and the carbon-nitrogen ratio of the pile was adjusted to 30∶1 for composting.The raw materials at different ratios were prepared to determine the temperature variation,maturity,germination index,and total contents of nitrogen,phosphorus,and potassium of the compost.The results showed that the high-temperature period,germination index,and total nutrient content of the compost in the three treatments all met standard of organic fertilizer.T1 presented the longest high-temperature period and highest germination index and contents of nitrogen,phosphorus,and potassium after 42 d of composting.To sum up,the three treatments all yielded composts with no toxin and standard maturity and nutrients as commercial organic fertilizer,particularly T1.In areas short of livestock manure,the rapeseed cake or compound fertilizer can also be used as a nitrogen source for the composting of horticultural waste.展开更多
基金Supported by the National Research Foundation,Prime Minister’s Office,Singapore under its Campus for Research Excellence and Technological Enterprise(CREATE)programme
文摘To realize full energy recovery from grass and chicken manure(CM), the integration of high-solid anaerobic digestion(HSAD) and gasification was investigated experimentally. The anaerobic biodegradability of grass can be enhanced through codigestion with CM. When the volatile solid(VS) ratio of CM to grass was 20:80, C/N ratio calculated to be 21.70, the cumulative biogas yield was the highest, 237 ml·(g VS)^(-1). The enhancement of biogas production was attributed to the buffering effects of ammonia and rich trace elements in CM. In semi-continuous systems, when the organic loading rate was 4.0 g VS·L^(-1)·d^(-1), the HSAD process was stable, with the average biogas yield 168 ml·(g VS)^(-1). More than 80% fractions of the digestates were volatile matters, which meant that the digestates can be used as feedstock for gasification to produce syngas. The VS ratio of grass to CM had significant overall energy generation through HSAD and gasification. Compared with gasification of digestate,cogasification with woodchips increased syngas yield and low heat value(LHV). Increasing of mass ratio of digestates to woodchips led to the decrease of LHV.
文摘This study aimed to explore the optimal material ratio for composting of horticultural waste,which was expected to improve the utilization rate of this waste.To be specific,horticultural waste and edible fungus residue were mixed with pig manure,rapeseed cake,or compound fertilizer and the carbon-nitrogen ratio of the pile was adjusted to 30∶1 for composting.The raw materials at different ratios were prepared to determine the temperature variation,maturity,germination index,and total contents of nitrogen,phosphorus,and potassium of the compost.The results showed that the high-temperature period,germination index,and total nutrient content of the compost in the three treatments all met standard of organic fertilizer.T1 presented the longest high-temperature period and highest germination index and contents of nitrogen,phosphorus,and potassium after 42 d of composting.To sum up,the three treatments all yielded composts with no toxin and standard maturity and nutrients as commercial organic fertilizer,particularly T1.In areas short of livestock manure,the rapeseed cake or compound fertilizer can also be used as a nitrogen source for the composting of horticultural waste.
