tailieunhanh - Waste Water Evaluation and Management Part 16

Tham khảo tài liệu 'waste water evaluation and management part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Waste Water Treatment Options andits Associated Benefits 439 Fig. 2. 136L Capacity Metallic Prototype Biodigester Experimental studies The wastes were generally mixed with water in the ratio of 2 1 except in the cases where the wastewaters were used alone as control. In such instances the waste waters were used as they were without further dilution since the constituents were mainly water 93-95 . The digesters were charged up to level leaving head space for gas collection. They were stirred thoroughly and on a daily basis throughout the retention period to ensure homogenous blend of the wastes and dispersion of microbes in the entire mixture. Gas production measured as dm3 kg slurry or L Total mass of slurry were obtained by downward displacement of water by the gas. Analyses of wastes Physicochemical properties of the wastes such as ash moisture crude fibre contents crude fat crude nitrogen and protein contents carbon energy total and volatile solids were generally determined for all the wastes using recognized laboratory procedures. These properties inherent in the wastes determine and explain the behavior of the wastes during anaerobic digestion. Biochemical analyses such as pH ambient and influent temperatures were also monitored on the waste slurries as the digestion of the waste progressed. Microbial analysis was also carried out to determine the microbial total viable counts TVC for the waste slurries at different periods during the digestion at the point of charging the digester at the point of flammability at the peak of gas production and at the end of the retention period. In some cases flammable gas composition from the different wastes were also analyzed. 6. Results and discussion The various results obtained during each of the studies are as itemized below 1. Anaerobic batch co-digestion of cassava waste water and Swine dung The cassava waste water alone had the highest yield of biogas production 130 dm3 Total mass of slurry even though the gas .

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