I am quite fond of the idea of methane production for energy and waste disposal, so when I saw the CD3WD PD A Chinese Biogas Manual, I had to get it on my website. It is interesting that the Chinese use biogas much more than we do in America.
Since 1950 China has experimented with biogas from agricultural wastes
This is a practice based upon age old Chinese tradition. The Chinese compost human, animal and plant wastes to produce an organic fertilizer of high quality.
In 1975 China began to ferment waste an airtight and watertight containers. This allows the production of methane gas. The collected Methane has many uses. This includes fuel for motors, cooking and lighting.
The production of biogas is regarded in many countries as a by-product of an efficient system of energy production, In China it has become a comprehensive, controlled method of waste disposal. Additionally, it allows recycling resources, supplying energy and fertilizer and improving rural health.
Most importantly, the digesting of wastes in a closed container kills many of the pathogens responsible for common human diseases.A Chinese Biogas Manual
Once again, the CD3wd Set did not disappoint, I found a lot of good information in this manual and I hope it was useful to you also.