Frequently Asked Questions
Q. Is the biogas dangerous and can it explode?
All types of gas by nature are flammable and will ignite if there is a large concentration present in the air. However Biogas is safer than LPG, Butane or Propane in that the gas is not compressed in large amounts in cylinders but stored in a soft and robust PVC biogas bag. Because the biogas is not compressed but is stored at atmospheric pressure (i.e. the same pressure as the air around you) there is a far less chance of a leak from the bag. The quantity of gas being stored in a MyGug biogas bag is small also and is being produced all the time so there is not a big reservoir of gas which can be dangerous. Gas cylinders on the other hand are at high pressure and the quantities of gas are very large so hold a lot more potential energy and risk. Even though the possibility of any accident is extremely low with a MyGug, our safety standards are very high and all necessary measures are taken to ensure safe and convenient use of the biogas.
Q. How does it work?
MyGug uses a natural process called Anaerobic Digestion to convert your food waste to free sources of energy (biogas) and nutrient-rich liquid bio-fertiliser.
Q. How much food waste can I put into it every day?
The MyGug Mini for a domestic setting can digest up to 2.66 kg of food waste on average per day...the food waste generated by 5-10 people. There is a balance tank so some days you may put in more. Commercial models can treat up to 25 Tonnes of food waste per year.
Q. Can I dispose of both raw and cooked food?
Yes! MyGug will happily digest all of your cooked and raw food waste. The real benefit of Micro Anaerobic Digestion is that it will accept all organic food waste. As an example the following is a non-exhaustive list: stale bread, cornflakes and cereals your kids haven't finished, uneaten sandwiches, left over stew, out of date yogurt and preserves, vegetable peelings, grease and oily waste, mayonnaise and all sauces , chicken, fish and all meats, ice cream, beer, wine and milk. MyGug will turn all of these solid and liquid food wastes into biogas and organic bio-feriliser. If you are using your digestate for growing vegetables we do not recommend you dispose of raw meats.
Q. Is it difficult to use?
MyGug is very easy to use. It sits in your garden and comes with a small sink and macerator unit. Put your food waste into the sink and press the button. It is as simple as that.
Q. Does it smell?
No, All parts of MyGug are fully enclosed so there is no way for smells to escape. We recommend that the sink is cleaned down with half a lemon and covered after each use. There is a compost type smell from the digestate but it is not unpleasant.
Q. How much biogas will it produce?
A domestic scale MyGug will give you between 1-2 hours cooking time per day (usually about 200L to 500L of biogas per day). For commercial digesters a good rule of thumb is every 10kg of food waste will produce the equivalent of 1kg of compressed gas. Some food waste will produce more biogas than other types of food waste. For example Diary, bread, grease and oily food waste will produce more biogas than vegetable waste.
Q. How do I know when it's full ?
MyGug is a fully automated system and shows the user when it has reached it's capacity so that you don't overfill!
Q. Is it ok to dispose of non-food waste ?
No. This is a disposal system using a natural process to safely and efficiently dispose of food waste only…to do so would damage the system.
Q. How is it good for the environment?
By using MyGug, the need to store food waste in the home is no longer an issue, bin collections are no longer required, landfills are not needed and carbon emissions are reduced as you have a safe and economical method of disposing of food waste at home! Because MyGug creates biogas from your food waste you will also be reducing your usage of fossil fuel derived gas.
Q. Why is it Egg Shaped?
There are a number of reasons why it is egg shaped. The egg shape is really good for mixing the contents of the egg (no corners or dead zones for solids to settle in), the egg shape is inherently a very strong shape (from nature!) and finally and possibly most importantly, it looks good!
Q. Can I buy it now?
Yes, we are launching our domestic MyGug in Summer 2021. Initially we will be installing in Ireland but we hope to expand to Europe and further afield in the near future. We are also quoting for Commercial Micro AD plants in Europe. Get in touch if you have a business that generates food waste and you would like a detailed quote.
Q. Can grass cuttings or human waste go into MyGug?
We don't put grass directly into the digester as it would clog the macerator. You can however capture much of the energy from your grass clippings if you put them in any type of tank or even a plastic sheet that will capture the runoff as the grass breaks down. This is a strong brown liquid and this liquid can be poured directly into the sink where it will then be pumped to the digester giving you back energy in the form of biogas. MyGug is not designed to accept human waste.
Q. Does the gas need to be compressed and what pressure is it compressed to?
We do not really compress the gas, we only slightly pressurise it. We pressurise the gas to about 23millibar (mbar). This is only 23cm of water head which is all that is required for a standard cooker. Gas is normally compressed to enable it to be transported. Natural gas is compressed up to 250 Bar (250,000mbar) which is over 10,000 times the pressure that is required at the cooker (a regulator reduces this pressure to 23mbar). As our units produce biogas all the time there is no transport requirement so we do not waste energy compressing it into a cylinder.
Q. Can I use my gas hob with biogas.
Yes, it is possible to use a standard gas hob with biogas. The existing gas jets would have to be made bigger however. We do recommend using one of our biogas stoves with our units however.
Q. How is MyGug kept warm in winter?
MyGug is fully insulated. It is actually an egg inside an egg with an insulation layer between both eggs. It also has an automated heating system that maintains the temperature inside the digester at 38 degrees C (i.e. optimal digestion temperature).
Q. How much space is required and can it be placed near the house?
A domestic unit requires about 2m x 1.5m space. Larger and smaller biogas storage bags are available. The MyGug can be placed near the house.
For more information about MyGug please contact us:
Address: Clonakilty, Co. Cork, Ireland.
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