Results 1 to 6 of 6

Thread: using glycerine in bio gas digester

  1. #1
    Join Date
    Apr 2011
    Location
    Lismore NSW
    Posts
    303

    using glycerine in bio gas digester

    Good morning Gents,

    As we are hopefully moving onto our new block in the next few month, I have been trying to find a way to deal with the challenge of disposing the glycerine properly. We are going totally of grid, no sewer connection at all. Only the good old septic. Since we are using composting toilets, our septic is designed for that accordingly.

    Over the weekend I had a look around and some people on the net suggested to take it to the sewer plant as they would be happy to take it for free to feed their methane digester. Being a practical curious guys as we all are on here, I had a look around and found out that it is rather easy to build your own digester and to make your own gas for cooking and possible heating/hot water.

    Now the question, is there anyone here who has done or is doing just that? And if so, how much do you feed into the digester. I have read somewhere that glycerine is a high energy feed, so one must be careful not to feed to much otherwise acid forming bacteria kill the methane forming bacteria.

    I figured since the pollies are threatening us with a gas shortage in the near future, prices will go up a fair bit, so making our own supply would be great.

    Many thanks and have a great Monday!

    Jens
    1990 Toyota Hilux LN106 with ATG 2 tank system (sold after running 150.000 ks on mainly WVO)
    1993 Toyota 75 Series with 1 HZ engine both 75l factory tanks and a custom 170l under tray tank.
    200.000km 80% on bio 10% on WVO 10% on dino,

    "him who never made a mistake, made no discovery either"


  2. #2
    Join Date
    Dec 2016
    Location
    York UK
    Posts
    25

    Re: using glycerine in bio gas digester

    Hi Bueff, I send my potassium glycerol to an A/D facility. As you say it is a 'high energy 'feed and the people that take mine in 1000 to 2000 litre batches are glad to have it.
    When the tanker arrives to take it, it then goes to a food pre-packing plant where approx 25000 litres of liquid food waste are pumped in, so the dilution is small.

    Dave.

  3. #3
    Join Date
    Apr 2007
    Location
    numurkah
    Posts
    496

    Re: using glycerine in bio gas digester


  4. #4
    Join Date
    Sep 2005
    Location
    WA
    Posts
    3,998

    Re: using glycerine in bio gas digester

    Bueff,
    You would be better using the human wastes to feed the bio gas digester than using a composting toilet. This will provide the 'starter microbes' and provide some dilution for the biodiesel byproduct. Will you have neighbours with lawns, or paddocks which need mowing regularly? these wastes can be added to the digester to improve its output and further dilute the byproduct.

    You will need some form of methane storage too.

    Have fun.
    Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

    Current Vehicles on oil based fuels:
    '85 Mercedes Benz W123 300CD Turbodiesel
    '98 Mercedes W202 C250 Turbodiesel (my car)
    '99 Mercedes W202 C250 Turbodiesel (my darling Wife's car) [sold]


    Searching the Biofuels Forum using Google

    Adding images and/or documents to your posts


  5. #5
    Join Date
    Apr 2011
    Location
    Lismore NSW
    Posts
    303

    Re: using glycerine in bio gas digester

    Quote Originally Posted by Tony From West Oz View Post
    Bueff,
    You would be better using the human wastes to feed the bio gas digester than using a composting toilet.
    Have fun.
    Thanks Tony,

    (Un)Fortunately we already have the 'side waste plan' done up and I am reluctant to pay another $1500 for the new site waste management plan, besides our system would then increase in size, the trenches have to be bigger..... you name it.

    We have have just over 2 acres, so plenty of grass clippings, plus food scraps and clycerine. I don't think we would need a massive digester to produce gas for just cooking and possible hot water if the sun is not out.

    Let's see how we go. Thanks for the input so far
    1990 Toyota Hilux LN106 with ATG 2 tank system (sold after running 150.000 ks on mainly WVO)
    1993 Toyota 75 Series with 1 HZ engine both 75l factory tanks and a custom 170l under tray tank.
    200.000km 80% on bio 10% on WVO 10% on dino,

    "him who never made a mistake, made no discovery either"


  6. #6
    Join Date
    Nov 2010
    Location
    Fort Worth, Texas, USA
    Posts
    223

    Re: using glycerine in bio gas digester

    Using medical grade glycerine I made glycerol triacetate. I think it's a fuel additive. It's worth more than glycerine, it's good for something, rather than being waste product. The formula I used was the Fisher Esterification (an old formula) Carboxylic acid (glacial acetic acid) plus alchol (glycerine) plus catalytic (small) quantity of sulfuric acid yields glyceryl triacetate (a fuel additive) plus three molecules of water. The money is in the junk end of the business. Glycerine by product might be synthesized into a liquid material that might be sold rather than washed down the drain. Another formula for it is acetic anhydride with catalytic quantity of concentrated sulfuric acid plus purified glycerine yields glyceryl triacetate.
    Last edited by WesleyB; 18th April 2017 at 07:08 PM. Reason: spelling

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •