CH/sub 4/ flux from biogas generators and rice paddies as measured in Sichuan, China. (Annual progress report)

Technical Report · Wed Jan 01 00:00:00 EST 1986

OSTI ID:5075059

Wang, M; Khalil, M A.K.; Rasmussen, R A

We report methane release rates from several biogas generators and from rice paddies in Sichuan, China, during four different stages of growth, using chamber techniques. The release rates from biogas generators vary greatly from pit to pit, ranging between 0.037 and 50 g/day/pit, very much depending on the seal characteristics of the pits. If this result was representative for the whole year round and all the biogas pits in China, it would result in a total annual CH/sub 4/ release of 1 x 10/sup 8/ to 1.5 x 10/sup 11/ g for the 8 million biogas pits now used in China. CH/sub 4/ flux from rice paddies varies significantly from place to place and from time to time. The measured CH/sub 4/ fluxes are larger during the seedling stage and shortly before harvest, ranging from 3.1 to 2889 mg/m/sup 2//day. During the seedling stage transport through air bubbles may have a significant contribution to the total CH/sub 4/ emission, as air bubbles are commonly seen in the seedling beds and the measured CH/sub 4/ flux is much higher at a spot with air bubbles than at a spot without air bubbles.

• Research Organization: Academia Sinica, Beijing (China). Inst. of Atmospheric Physics; Oregon Graduate Center, Beaverton (USA). Inst. of Atmospheric Sciences
• DOE Contract Number: FG06-85ER60313
• OSTI ID: 5075059
• Report Number(s): DOE/ER/60313-2; ON: DE87001403
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
BIOGAS PROCESS
POLLUTION SOURCES
METHANE
EMISSION
PONDS
CHINA
RICE
ALKANES
ANAEROBIC DIGESTION
ASIA
BIOCONVERSION
CEREALS
DIGESTION
GRASS
HYDROCARBONS
MANAGEMENT
ORGANIC COMPOUNDS
PLANTS
PROCESSING
SURFACE WATERS
WASTE MANAGEMENT
WASTE PROCESSING
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)