1. What is the difference between BIOMIRU and fixed-dome?

There are two types of biogas reactors: fixed-dome or concrete dome and mini home biogas (BIOMIRU). Both have different functions and forms. What distinguishes the most is its use, namely, the fixed-dome or concrete dome has a larger scale for storing manure than the Mini-Home Biogas (BIOMIRU). Besides, the building material. If the fixed-dome is made of concrete, the Biogas Mini Home is made of PE (Polyethylene).

Fixed-dome biogas technology is a biogas reactor technology in the form of a concrete dome. This concrete dome can convert organic waste, such as livestock manure, human manure, and other organic matter into biogas.

Resembling its name, this fixed-dome is a dome made of brick and concrete but buried underground and designed to be planted below ground level to avoid possible physical damage and save space. This fixed-dome can last up to 15 years, accompanied by a 1-year guarantee from Yayasan Rumah Energi. This concrete dome refers to SNI 7927: 2013. As for building construction, it refers to SNI 7826: 2012.

BIOMIRU (Mini Home Biogas)
Meanwhile, Biogas Mini Home (BIOMIRU) is the newest product innovation of Yayasan Rumah Energi for urban people. If fixed-dome biogas products or concrete domes generally require a lot of space to build reactor installations and animal manure as raw material for energy fuel as well as heavier materials, BIOMIRU comes with a size for limited land and biogas fuel raw materials from organic kitchen waste with a lighter but stronger material, namely PE (Polyethylene).

BIOMIRU is here to provide solutions for urban people who want to choose daily energy sources, especially for cooking. Suppose biogas is known as renewable energy that requires large amounts of livestock manure as raw material. In that case, BIOMIRU focuses on managing kitchen waste so that it doesn’t become a problem and returning it to the kitchen again. The land required to build this reactor is not as large as a biogas reactor, which only needs 2-6 m2 of land.

2. How long will the fixed-dome last?

With regular care and use, the fixed-dome can last up to 25 years. In addition to its long duration, the fixed-dome also has minimal maintenance. To operate the fixed-dome, a minimum of two cows or seven pigs or 170 chickens is required. This figure is needed to meet the needs of the primary raw material for biogas, namely livestock manure.

3. How do I get the raw materials into the fixed-dome?

There is no equal amount of manure per reactor. The size of the biogas reactor determines the amount of animal waste. For example, the reactor’s height is four cubic meters, so the animal manure needed as the first filling is 1,600 kg. Then for daily filling requires 32 kilograms with a mixture of water (1: 1). Very good if you add bio-slurry in the first use. Bio-slurry can help the process of seeding bacteria in the reactor.

First of all, to start operating, the biogas reactor puts dirt and water into the inlet. Then mix well until it reaches a total density of 6-10%. Before flowing the mixture of animal waste and water through the inlet pipe to the reactor, ensure all the valves are open. Then, fill the reactor utility hole until it is almost full. If you make sure that the reactor is fully filled, close the valve and wait a few moments until methane gas (biogas) is created.

Because when the reactor is finished, it must be filled immediately, so during the process of making the fixed-dome, it is better to collect animal manure. So when the fixed-dome is ready, it can be filled immediately. For the first filling, Kohe is an animal waste with lots of bacteria or animal waste that is still fresh. It would be better if the animal manure is mixed with bio-slurry so that the bacteria are more complete and active, which will help the fermentation process better.

Things that need to be considered when filling the reactor:

  • Collect animal waste that is pure and does not contain hay or other ingredients.
  • Remove unwanted materials such as leftover food, soil, rocks, and other materials from manure or manure before mixing them with water.
  • Put the straw, leftover fodder, and other organic material into the compost pit. Do not leave these materials unattended around the inlet.
  • The reactor should not be filled with manure while the gas is being used.
  • Use enough water to wash the inlet—no need to use soap or detergent.
  • For refilling the reactor, make sure that the volume ratio between manure and water has been established. Avoid using dry or old manure to enter the reactor.
  • If available, it is recommended for the prime filling to use processed bio-slurry (as much as 50-60 kg).

4. What kind of damage often occurs?

Leaks usually occur in the following places:

  • The connection between the dome of the gas pipe and the iron thread before the main gas valve
  • The connection between the main gas valve and pipeline.
  • Every connection in the pipeline.
  • The connection between gas faucet and pipeline.
  • The connection between pipelines and gas lamps.
  • Also, leaks can also come from equipment.
  • To check the spot of the leak, take the following steps:
  • Prepare soap and water.
  • Mix soap and water, then beat until foamy.
  • Apply foam to the connection points.
  • If there is a leak, the foam will break or move.

In addition to ensuring that there are no leaks so that the reactor can work optimally, it is also necessary to pay attention to the fixed dome reactor maintenance procedure. Among others:

  • Maintain a landfill above the dome regularly.
  • Clean and lubricate the main gas valve.
  • Clean and lubricate gas faucets.
  • Clean or repair gas lamps.
  • Clean or repair the water drain and overflow.
  • Repair pipe joints to stop leaks.
  • Clean the stove.
  • It is replacing the rubber hose pipe.

If you have followed some of these maintenance guidelines, the fixed dome reactor will reach a more extended life while producing optimal, efficient, and clean energy.

5. What to do if damage occurs?

Fixed-dome is a licensed product of Yayasan Rumah Energi and has a three-year total warranty. If the damage persists after guidance for leaks’ anticipation, you can contact Rumah Energi for immediate repair. Rumah Energi has a RESCO (Renewable Energy Service Corporation) program assigned as a field team.