CONSTRUCTION OF HYBRID BIOGAS DIGESTER

INTRODUCTION TO CONSTRUCTION OF HYBRID BIO-DIGESTER – VACVINA

 INTRODUCTION TO CONSTRUCTION OF HYBRID BIO-DIGESTER – VACVINA

The objective of this book is to provide trainees with the process at each step as well as
echnical concept in building Vacvina bio-digester with its significant modification as follows  

• Study possible digester construction site on basis of geographical and soil condition;

•   Technical design in building and fixing underground tanks;

•   How to prepare and install equipments for Vacvina plant; and

•   Other factors to operate and maintain Vacvina tanks.

 Table of contents
 
1. How to Calculate Required Digester Volume ....................................................................................... 2
2. Preparation of Construction Materials and Appliances......................................................................... 3
3. Construction and Material Installation .................................................................................................. 4
3.1. Digester construction.......................................................................................................................................4
3.1.1. Digging.....................................................................................................................................................4
a. Construction site selection..........................................................................................................................4
b. Digging.......................................................................................................................................................4
3.2.2. Making digester foundation......................................................................................................................4
3.1.3. Bricklaying of the walls ...........................................................................................................................5
3.1.4. Mortar and cement liquid plastering.........................................................................................................5
3.1.5. Making digester concrete .........................................................................................................................6
a. How to assemble mold and install supporters of the mold to construct digester concrete..........................7
b. How to determine and make the technical hole during construction of top concrete.................................7
c. Preparing and casting iron rods ..................................................................................................................8
d. How to mix cement to construct top concrete 200B...................................................................................8
e. Concrete thickness......................................................................................................................................8
f. Concrete vibration and maintenance...........................................................................................................8
g. Making technical hole cover ......................................................................................................................9
3.1.6. Making concrete of worktop for cooking.................................................................................................9
3.2. Installation of appliances...............................................................................................................................10
3.2.1. Installation of inlets (siphon)..................................................................................................................10
3.2.2. Installation of outlet system ...................................................................................................................11
3.2.3. Installation of bottle safety valve ...........................................................................................................12
3.2.4. Installation of gas reservoir ....................................................................................................................12
a. How to install gas reservoir ......................................................................................................................13
b. Technique in tying gas reservoir ..............................................................................................................13

c. How to tie gas reservoir with plastic tube at its end .................................................................................13
d. Selection of place for gas reservoir ..........................................................................................................13
e. Operation..................................................................................................................................................13
3.2.5. Installation of biogas burners .................................................................................................................14
3.3. Filling soil around the digester ......................................................................................................................14
4. Attention for Operation and Maintenance of Biodigester – Vacvina Model....................................... 15
4.1. Feeding raw materials into digester...............................................................................................................15
4.1.1. First feeding of manure ..........................................................................................................................15
4.1.2. Daily feeding of manure.........................................................................................................................15
4.2. Operation of biodigester................................................................................................................................15
4.2.1. When reservoir is full of gas ..................................................................................................................15
4.2.2. When gas burners in operation...............................................................................................................16
4.2.3. When whole system in use .....................................................................................................................16
4.2.4. Warning of chemical into digester .........................................................................................................16
5. Appendix ............................................................................................................................................. 17
5.1. Practical exercise in calculation of total volume of a digester, construction materials and investment cost.17
5.1.1. Ouch Veasna family (Takeo province)...................................................................................................17
5.1.2. Thap Chaney (Kampong Speu province) ...............................................................................................19
5.2. Detail designs of biodigester system.............................................................................................................22
 
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