A New High Output and Low Energy Consumption Biogas Fermentation Technology

The main goal of the design of a good biogas digester is the high productive output per unit volume of tbe fermentation chamber with low energy consumption In order to reach the goal, in the author' s mind, the most important thing is what kind of fermentation technology used. In this paper, the author wishes to present a new design of biogas fermentation technology which has been used in some digesters in Beijing and Shanghai Municipalities in China. Each one of them got successful results.The new design is to fit the features of most animal farms in China that they mainly use the manpower to clean the animal excrements which are used as the raw materials for biogas production. Surely, some farms may use the water to wash down all the excrements too.In the customary design, there are three types of fermentation technology to be used in the biogas digesters.They are as follows:the first type is the forced sludge drain type equipped with certain device inside the fermentation chamber; the second one is to mix the sludge and newly feeding raw materials together by a stirrer; the third one is that the digester is feeded with the high concentrated solid raw materials. Each one of them has its own merits and demerits. Now, the author has adopted some of the merits of these three types and added authors' s some new idea to make a new design of fermentation technology on the horizontal, mechanically stirred, and heat added digesters. All these digesters reached the goals of high gas productive rate based on the volume of the fermentation chamber, less energy consumption by the digester itself, simple structure, less investment and easy to operate.Besides the new fermentation technology, the paper also presents the structure of the digester, the facilities to be equipped and the testing data of the experimental digesters.