Biogas Construction and Production from Farm and Animal Wastes
June 26, 2009 by Leo 5,813 Views
Construction Instructions
- Select a location for the HBS close to where the gas will be used. (We recommend collecting manure and bringing it to the HBS for feeding.)
- Choose a location away from trees whose roots can break the digester walls. (Min area: 2.5 mtr x 3.0 mtr)
- Dig the ground 2.5m x 2.5m wide and 2.0m deep.
- Build the footings and reinforced concrete slab.
- Build the reinforced CHB walls. Upon reaching ground level, layout CHB walls for outlet compartment so that CHB and rebar interlocks are maintained. (Do not install all CHB for outlet compartment. See instructions below regarding cover installation.)
- The HBS has a below ground section of about 1.6 mtr and an above-ground section of 1.0 mtr. (This UNIQUE feature expedites sediment removal as described later in operation & maintenance.)
- After the CHB walls have dried, install the inlet, outlet and other pipes. Pipe locations may be changed to same or adjacent sides if preferred or needed.
- Install anchor bolts on the outside wall.
- Build the concrete slab for the outlet compartment and plaster the inside and outside walls. Use plaster mixture with a water sealer like Sahara.
- Cut the 6” orange PVC pipes in half and lay them on the CHB blocks. Place elbows (also cut in half) on the corners. Grout as needed to keep them in-place. (This is to protect cover material from sharp edges.)
- Clean the surfaces of the halved 6” orange PVC pipes and ay the HBS cover as if installing a table cloth.
- At the outside CHB wall section, where the anchor bolts are located, apply a 6” to 8” wide strip of sealant like Vulca-Seal. Ensure good sealant & plaster adhesion.
- Remember, after the cover material is sandwiched between the outside plaster and the wood plank, the sealant must create a gas-tight seal.
- On the wall adjacent to the outlet compartment, it is best that some CHB was omitted earlier to allow for HBS cover installation. Install the omitted CHB after the cover.
Bill of Materials
| Quantity | Description | Unit Price | Amount (PHP) |
| 300 pcs | 4″ CHB | 6.00 | 1,800.00 |
| 20 pcs | 10 mm Def Bar | 100.00 | 2,000.00 |
| 2 m3 | Sand | 500.00 | 1,000.00 |
| 0.5 m3 | Gravel | 1,000.00 | 500.00 |
| 20 bags | Portland Cement | 175.00 | 3,500.00 |
| 10 packs | Sahara Sealer | 30.00 | 300.00 |
| 20 pcs | Anchor Bolts | 50.00 | 1,000.00 |
| 2 qts | Vulca Seal | 350.00 | 700.00 |
| 4 pcs | 2″x4″x8′ Lumber | 250.00 | 1,000.00 |
| Sub-Total | 11,800.00 | ||
| 1 lot | HDPE Liner, Pipes & Fittings | 5,000.00 | |
| Total Materials | 16,800.00 | ||
| Labor | 4,200.00 | ||
| Supervision | 1,800.00 | ||
| TOTAL COST | 22,800.00 | ||
Operation and Maintenance
- Eventually (sooner if more inoculant was added and later if little or no inoculant was added at the start) biogas will be produced indicated by a fire or flame being lighted.
- Warning: The fire or flame produced may be invisible. (see picture.)
- Clogging: Run a gas pipe from the HBS to a burner such the pipe is progressively inclined. Biogas contains water vapor that condenses and collects in cavities that will hamper flow.
- Gas-Piping: Use the thicker 3/4” or 1.0” black PE water piping material (available in rolls in most hardware stores) and PE fittings and valves wherever possible.
- Unclogging: Occasionally, it may be necessary to lift sections of the gas pipe to flow accumulated condensate back into the HBS or the burner.
- Biogas Burners: See the pictures for the recommended burners. Do not use original valve and gas orifice. Replace those parts with a 1/4” or 3/8” pipe nipple connected by bushings to 1/2” or 3/4”plastic ball valve to allow high biogas flow into the burner.
- Sediment Removal: Do NOT cement (with PVC solvent or cement) the elbow on the EXIT PIPE. This elbow must be able to rotate on the pipe from the outlet compartment. After biogas is produced, the EXIT PIPE must be set at angled position to allow excess effluent to flow out when the HBS is fed. On a scheduled basis, like once a week, the EXIT PIPE may be fully rotated to expel sediment accumulated in the outlet compartment. The sediment or sludge may be used as an organic fertilizer.
For more illustrations, diagrams and drawings click here
Information about this design and the designer
The Philippine Home Biogas System (HBS) shown above was prepared on January 2006. A new version updated in October 2007 called HBS2 is now available. It uses an all-concrete construction so that it can be built anywhere at low cost. Building plans and instructions are provided FREE.
For latest modifications and instructions, assistance or questions, please email, call or text:
- Email: biogas.works@gmail.com
- Call or Text: 0927-407-1142
Join forums, discussions and message board here and here
sources: habmigern2003.info, environbusiness.com, appropedia.org
Pages: 1 2
2009 · All Rights Reversed ·
we are consultants for poultry dressing plants. feathers, mixed with manure and some innards are wastes we generate. we plan to dissolve it into a slurry using some enzymes. resulting product is more or less 20-25% cp with ph 10+/-. can we feed it to the digester to get biogas? pls send reply to my email address: dexter_olito@yahoo.com. thanks
Simple biogas digesters are best fed with plant (high carbohydrate & starchy) wastes or by-products like vegetable scraps, grass cuttings & leaves; food wastes like rice & bread; and, manures from animals fed with grass & grains.
We recommend pig, carabao, cow & poultry manure as they are abundant & do not need to be chopped or shredded like plant & food wastes.
Digesters fed with high protein stuff as what you have (20-25% cp) reportedly produce more biogas but they require more complex digesters as pH is usually high & fluctuating that it has to be monitored & managed.
All digesters work best at neutral or pH=7 & ambient temperatures as they are in the Philippines. In temperate countries digesters have to be warmed when it is cold.
I hope this information helps. Please also check our website that has been the source of the information described above.
I am just wondering how much chicken dung is needed to produce bio-gas. I am working in a poultry dressing plant as its plant manager, although we do have quite a sizable quantity of chicken dung aside from other organic waste, e.g. feathers, blood and innards. We either truck it to near by rendering plant for rendering processes and for them to dispose what they can not render.
Given, that we are using diesel fired boiler to produce hot water from steam for scalding, we are faced with the stiff cost considering the high cost of diesel fuel, while we manage to convert to firewood/coconut shell fed boiler, we still look at the possibility of producing bio-gas from chicken dung and other wastes that we have. Our neighboring dressing plant manage to operate a bio-generator however,they have to truck in additional animal waste to produce these bio-gas adding to the increasing BOD and very poor quality of their waste water?
I would like to know your opinion on this?
Thank you and there be more Pinoy Inventors herein!
Mabuhay!
robertkho
Many believe that with a biogas digester — facilities like poultry dressing plants, slaugther houses & abattoirs do not need Waste Water Treatment (WWT) systems as digesters replace WWTs. They are wrong but not completely wrong.
Simple lagoons used as WWTs produce biogas that escape into the atmosphere. As biogas is a potent greenhouse gas (GHG) that contribute to the worsening Climate Change & Global Warming problem, that is like releasing poison into the air.
Complex & compact WWTs produce less biogas because they are aerated. Biogas production needs an anaerobic or “no-air” environment.
In the past, installing a biogas digester was done to collect biogas for use as fuel. That has changed.
Now biogas digesters are used to capture biogas & keep it from escaping into the atmosphere. Doing so still provides a fuel that can replace expensive petroleum fuels. But even if the biogas is just “flared”, the project qualifies as a Clean Development Mechanism (CDM) of the United Nations Framework Convention on Climate Change (UNFCCC) & can receive substantial carbon credits (in monetary form as an incentive, subsidy or reward) — for doing something good for the world.
I apologize for the long reply. You have a good question & it deserved a good answer. Finally, I suggest you ADD a biogas digester to your WWT. Your WWT will operate more efficiently as it will have less work to do, you will get biogas for use as a fuel & you could be “rewarded handsomely for doing something good.”
Email me at: biofuelswork@gmail.com or browse: http://www.biofuelswork.com that has been the source of information presented above.
Salamat, nakatulong to sa research namen. :P \m/
Your write up was very informative but will want to know if there is a means of extracting liquid Ammonia from poultry litters.
sir, what are some modification to make the plastic drums as a digester? is the rice straw is as effective as the manure?
more power,
nelson
I have an existing piggery and I would like to know the complete details on how to construct from digester to methane storage container. Maybe complete drawings and materials details to make me build it safe and effective way. Since I’m still working overseas and I need it during my vacation time before this year ends.
Thanks a lot
@jim and jun, click page 2 for diagrams and drawings.
sir,
good day! please ako rin, kailangan ko ng diagram at klase ng materials.
maraming salamat po.
@jamaki, noel, JOTac, randy just follow all the links in Page 2 for additional info. (drawings, diagram, bill of materials, etc.)
pls send me a simple diagram of HBS
can you pls. send me a design diagram on how to construct this simple biogas,may maliit na piggery po kasi ako gusto ko lang masubokan. tanks.
pls have a copy of module…aim jamaki c sangcap..public teacher in high school
i teach tle and mapeh…i think this will help my student…
Its a very good idea. There is a conversion of waste into energy which we need in our daily living. Im preparing myself to put up a backyard hog raising. I want to minimize odor so as not to disturb my neighbor. And i want this idea to apply on my site. Can you give me the details how to contruct this Home Biogas System. Thank you for a valuable information.
More Power,
Randy