/r/AnaerobicDigestion

Photograph via snooOG

A place for anything related to anaerobic digestion. All civil discussions aren't just welcome, they're wanted.


The Anaerobic Digestion Reddit*

Anaerobic digestion is a series of processes in which microorganisms break down biodegradable material in the absence of oxygen. It is used for industrial or domestic purposes to manage waste and/or to release energy. Much of the fermentation used industrially to produce food and drink products, as well as home fermentation, uses anaerobic digestion. Silage is produced by anaerobic digestion.

Wikipedia: anaerobic digestion


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And Check Out the Big List of Related Reddits

/r/AnaerobicDigestion

658 Subscribers

3

Does anyone have experience using digestate as a soil ammendment?

I've seen many assertions that digestate is useful as a soil amendment, but no first hand accounts. Has anyone used it before? Are there any caveats that people don't know about?

5 Comments
2023/07/26
19:42 UTC

1

BioGas Digesters at The community of Tamera in Portugal | Renewable Energy

1 Comment
2023/02/08
10:37 UTC

2

Help with an experiment

I have very limited knowledge on the subject so please excuse my ignorance.

I am trying to find a way to create bioethanol, using the cheapest and easiest possible method. I've been using fermentation to produce ethanol from fruits and sugar, but sugar is becoming too expensive.

My plan was to use AD for the acquisition of sugars, created from carbohydrates, proteins etc at the hydrolysis stage, this way, I could get my glucose from kitchen waste, and not have to use any additional sugars.

From what I understand, during the acidogenesis stage, the sugars are converted into acetic acid, this is the part I don't want. I've read a couple of sources from institutions, reporting that the stages can all be isolated, but with my limited knowledge it's not the easiest to understand.

Would anyone here be able to answer my question? The end goal for me ideally, would be to halt the process at the hydrolysis stage, and then force ferment to maximize the alcohol content.

0 Comments
2023/01/26
22:41 UTC

0

Digestion diseases and how to cure them?

Deficiencies in the organs of the digestive system are referred to as digestive problems. Some examples of these organs are the gallbladder, stomach, intestines, and esophagus. Many symptoms that interfere with daily activities are caused by digestive problems. Vomiting, bloating, nausea and constipation are some of the typical symptoms. Digestive disorders can be caused by a variety of factors such as autoimmune diseases, genetics, digestive health, environmental factors, mental health conditions, and family history. Digestion diseases and its cure is very important in initial call.

To efficiently absorb all the vitamins, minerals, and other nutrients from our meals, our digestive system is equipped. The body needs these things in order to operate normally. Deficits in nutrition can therefore result from digestive issues. Other problems may develop as a result of a vitamin, mineral, or nutrient shortage. Anemia, for instance, might result from a lack of iron. It is a typical condition brought on by gastrointestinal problems.

1 Comment
2023/01/14
05:38 UTC

3

5 biogas digesters

0 Comments
2022/09/10
09:10 UTC

1

Running a biogas digester remotely

Hello people,

I noticed that many agricultural research institutes do not have direct access to
a real biogas digester. That was also a problem for me when I was myself a student.

So I created a webpage that lets anybody run experiments on a real biogas digester remotely.
It can also be used to evaluate if a small home reactor generates enough gas for one's purpose, before going out and buying one.

Because the resulting data is public, I expect that at the end we will arrive at a large dataset that anybody can use for e.g. machine learning purposes or other stuff! I think this would also gain potentially more insights into the anaerobic digestion process itself, as to my knowledge there is no single large body of biogas data (from a single source) available.

I would love to have feedback and ideas on how to make it better!

1 Comment
2022/08/22
16:00 UTC

3

Anaerobic Water Treatment Toxicity

What chemicals and in what concentrations have you guys seen that create toxic conditions for anaerobic digestion?

0 Comments
2022/03/29
20:22 UTC

5

BioGas Digesters at The community of Tamera in Portugal

4 Comments
2022/02/10
09:01 UTC

3

Gillian Palino: Methane Potential of Indigenous Algae

1 Comment
2022/01/19
07:58 UTC

3

Question Regarding Using Algae for Methane Powered Electricity

I'm eager to make my own power generator using anaerobic digestion and I know that basic food scraps, human waste and garden waste would make enough methane for the most part, but I want to have exceptional production of methane for natural gas usage in cooking and potentially use in vehicles, also I'd like to set up a server run on methane power which will require a lot of energy.

I know the effluent from anaerobic digesters is really good nutrients for algae production but I was curious if it would work the other way around, I assume I'd want to kill the algae before feeding it to the digester so it doesn't add oxigen to the anaerobic environment but would the algae even be a good feed stock? I've read that algae decomposing on shorelines is a large source of greenhouse methane so this is where my idea comes from.

Ultimately I'd like to produce more algae than I'd need as well so I can use it for carbon sequestration to make the system carbon negative, seeing as algae uses CO2 to grow it would be possible to pump the exhaust from the power generator back into the system and the heat from the generator operating could be used to heat the whole system, and ideally the algae strain would be an edible strain such as spirulina for that extra usefulness.

3 Comments
2022/01/18
08:08 UTC

1

How does a three phase separator work in a UASB reactor?

Pretty much the title, would anyone please mind providing me some insight as to how biogas is separated from the solid and liquid contents of a UASB reactor? Thank you very much.

3 Comments
2022/01/09
12:04 UTC

3

Energy output from your digester Plant

Hi All,

I have recently started working on a new AD plant which has been running for 4 years.

The plant has been run by a management company and the energy output we have been getting has varied which is ultimately impacting our revenue.

I am keen to get an understanding from other plants what the average percentage of energy production capacity they run at?

We have fluctuated from 75% in a year to 96% another year.

Thanks

0 Comments
2022/01/03
18:56 UTC

3

How to analyse the molecular composition of sludge from my anaerobic digester

Hi all,

I am intending on building a UASB reactor for biohydrogen production and was wondering whether anyone could provide suggestions as to how I may assay activated sludge sampled from my bioreactor so as to measure the presence of various chemicals in said sludge (e.g., VFAs). Thanks a lot.

1 Comment
2022/01/02
14:44 UTC

6

Manure from cows feed seaweed

Hi all,

Can someone answer this?

Some farmers have feed seaweed to cow in order to reduce thier methane output.

Would the manure from such a animal be better or worse for a anaerobic digester?

2 Comments
2021/07/20
13:25 UTC

8

Too much biogas! What can I do with it?

Hi all,

So i've got a 4m3 AD set up and I'm producing a lot of gas that I have no use for. I'm currently burning it off every day, but this is taking a long time as my pump can only do 40L/min.

Do you have any suggestions for low-tech or low cost ways in which I could actively use this biogas so that I don't have to be constantly burning it?

My initial thoughts are of using some sort of caravan gas heater that has an auto shutoff when gas runs out.

Thanks for your time!

6 Comments
2021/06/29
11:05 UTC

5

What does sludge purge mean with respect to anaerobic digesters?

3 Comments
2021/06/27
12:57 UTC

2

If the image is clear enough, could you please tell me what the symbols circled on this anaerobic digester schematic are indicative of? Thanks a lot.

4 Comments
2021/06/26
10:32 UTC

1

Effluent Transportation

Hi all, was wondering how I may transport effluent in a domestic, multi-stage anaerobic digester between tanks. I have seen people use pumps, however, am still unsure and was looking for some advice. Could you please explain how I may do so? Thank you very much.

0 Comments
2021/06/26
10:31 UTC

1

How can I make sure there is no oxygen inside the reactor?

Hello all. I am an engineering student currently taking my thesis. My thesis is a small-scale anaerobic digester and I've been wondering how do I make sure there is no oxygen inside the reactor? My professor asked me "How anaerobic is anaerobic?" And I seriously have no answer to that.

Hope you guys can help me.

4 Comments
2021/05/15
16:32 UTC

4

a simple video showing 5 different bio gas digesters

0 Comments
2021/03/08
10:27 UTC

4

AD in USA

Hello all,

I'm very interested in implementing AD waste treatment systems.

I'd like to learn from experienced running facilities.

Anyone know of municipal waste treatment or agricultural waste treatment facilities in USA?

Im in PNW and am attempting investigation into facilities that operate in my region. I want to visit and see the operations/talk to engineers/designers.

3 Comments
2020/11/26
20:05 UTC

2

Optimal mix of pure glucose and cellulose as raw material

Excuse me for the somewhat vague question, but assuming one would somehow have as raw material pure glucose and/or cellulose, what would roughly be the best mix for maximum methane generation?

5 Comments
2020/06/29
07:30 UTC

3

Digestate composition

I’m wondering if there is a method to theoretically calculate the composition of nutrients of digestate from an AD plant that I’m designing for school. It uses household food waste btw

1 Comment
2020/01/29
23:45 UTC

3

Liquid fertilizer question?

Im curious if the liquid fertilizer could be used in a hydroponic nutrient solution. Has anyone tried something like this?

1 Comment
2020/01/13
23:24 UTC

3

Is the liquid and/or solid byproducts of Anaerobic Digesters typically sold for a profit or given away to local farmers?

Or do some operations even have to pay to dispose of it?

3 Comments
2019/06/10
19:04 UTC

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