| Author | Hu, Qichun |
| Call Number | AIT RSPR no. EV-91-01 |
| Subject(s) | Biogas--China--Xindu
|
| Note | A research study submitted for approval in partial
fulfillment of the requirement for the degree of
Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | The field survey mainly by means of questionnaire to investigate the present state
of the application of biogas technology, was conducted in the three representative
villages in Xindu county, China. Among total of 1678 farmer households, there
were 804 households owning digesters, but only 374 digesters in use. Biogas
shared 7.5% of daily fuel c3nsumpti on. Under local condition, the capital
invested of a digester with 8 m volume \vas 439 Yuan, (equivalent to 93 U$, 1990).
If one household digester could produce 246.6 m3 biogas per year and the
equivalent price of biogas was 0.265 Yuan, the pay-back time was about 7 years.
The vast majority of present digesters in use were cylindrically fixed dome
hydraulic digesters with an average volume of 9.6 m3. Based on conventional type
of the digesters, some modified digesters have developed recent years , in this
area. The quality and the lifetime of the digesters in use were also be
analyzed. There were nearly half of the digesters in use, need to be renewed
gradually up t o 1995, since the reason of their quality. Otherwise the biogas
consumption level in these areas would be reduced later on. Meanwhile the
proposals for solvi ng the problems restraining the adoption of biogas technology
were also given. The economic benefits of the digesters could be promoted by both
increasing the using ratio of total digesters and the biogas production rate. And
also the application of the technologies of digested residue could increase the
income from biogas fermentation.
Because there crop straws were rarely being used as fermentation materials, the
function of converting straws to fertilizer by the digersters might be loss. In
addition, since only pig manure and human excreta were as the substrate, the
shortage of fermentation material was common problem. A new pattern for straw
utilization was proposed, in which raising cattle with straw as a feed, and
consequently the feed of cattle manure to the digesters is likely a promising way
to solve the shortage of fermentation material. |
| Year | 1991 |
| Type | Research Study Project Report (RSPR) |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Harada, Hideki; |
| Examination Committee(s) | Tentscher, Wolfgang;Verink, Johan;Mino, T.; |
| Scholarship Donor(s) | Australian Government; |
| Degree | Research Studies Project Report (M.Sc.) - Asian Institute of Technology, 1991 |