a) In Fig 3 , the increase in gas production per unit mass of feed from the 5th day onwards can be attributed to the effects of a more settled bacteria culture due to increase in feed, the digestion of any undigested waste due to compounding since the reaction takes between 24 and 36 hours to complete and due to improper mixing in the digester.
b) In Fig 4, a significant drop after not feeding for 5 days was observed. This shows that the plant can go without being fed for 3- 4 days without significant loss in performance.
c) In Fig 5, it is clear that feeding the plant with whole food results in large under utilization of the plant as it takes much longer to digest. Hand crushed food works good with foods that can be crushed down to paste by hand but foods like chapattis show a significant drop in volume of gas generated unless they are blended using a blender.
d) In Fig 6, a noticeable dip in the amount of gas generated per unit mass of feed is observed. The bacteria culture is negatively affected due to irregular feed and missed feed.
e) A consistent drop in production is observed from the 8th day of underfeeding (Fig 7). The gas production dropped to a minimum of 0.2 m3 from the regular 0.25 m3 in a period of 14 days.