摘要：This research focuses on a new parameter that can directly affect the biogas production. The study wascarried out in two groups under two different temperature conditions. The first group, outside the door (allowthe digester temperature to change according to ambient temperature), and the second is in the controlroom that support the digester to keep the temperature in balance without fluctuation, however there is nosource of heating. Each group has three digesters with different total solid (TS) i.e, 6, 8 and 10% TS. Theresult shows that the average of the temperatures inside the digesters of the outdoor group (first group) was29.39°C (52.2°C maximum, and 12°C minimum) compared with the control room group (second group),which was 25.7°C (30°C maximum, and 20°C minimum). However, the temperature in the first group washigher, but biogas production of the second group was more constant and higher. This phenomenon is dueto the gas production been significantly affected by variations of temperature inside the digester during thedaytime in the first group. This problem could explain the reason of changing the biogas production in biogasdigester that does not use any heat source (lagoon, underground digester, etc.). As the temperature decreasessharply, the gas production also decreases sharply. Accordingly, it is difficult to generate large amounts ofgas with stable performance without keeping the temperature inside the digesters in balance throughout thewhole fermentation days, even though there is no heating source. Therefore, we recommended one of threesolar heating models that is able to keep it in balance temperature and, therefore increase the performanceof fermentation without daily additional costs.
