Is it too late for AD

[mawleymoos]

Back to the original question! I should have updated before now! We have taken the plunge! After discussing the situation with OMNI, they are building me, their own design 80kw digester! They seem to have a lot of knowledge on low cost digesters but are using top quality equipment! It is well on, in its build and I will try and post some photos!

 

[mawleymoos]

Sussed it!!!

 

[Chippy]

Wow that was fast. Is this biolectrics new 80kw version I heard about? That size of wind turbine surely provides more than enough power?

 

[mawleymoos]

Wow that was fast. Is this biolectrics new 80kw version I heard about? That size of wind turbine surely provides more than enough power?

It is OMNI's own 80 kw plant! We have 400 animals on slurry in the winter and 280 the rest of the year! Which is more slurry than the biolectric is designed for! They seem to be doing a top job! Cummings engine, 1200m3 s/s tank and Landia pumps !
The turbine only produces approx 1/3 of our electric but we also have a roof covered in solar doing another1/3! Which takes a bit of the shine of the digester! However they are hoping that the digester will stand on its own two feet without subs! So the bit of subs we get will offset the lower electric price!

 

[Digester Man]

80kw sounds like a lot from that number of animals? How much slurry would that be over the course of a year?

 

[mawleymoos]

80kw sounds like a lot from that number of animals? How much slurry would that be over the course of a year?

We are hoping to get 60kw at the momen! but looking at bedding the cows with something that produces gas along with futureproofing it! Now is the time to do it! As long as it runs ok at the lower rate!

 

[Chippy]

Any idea what bedding is best? This study was done by Envirosystems and it compared which product was best for anaerobic digestion when mixed with slurry. They compared sawdust, limeash, gypsum, sand and envirobed. Envirobed was the best product!
http://www.envirosystems.co.uk/greatest-hydrogen-sulphide-risk-gypsum-bedding-mixed-slurry/

 

[mawleymoos]

Any idea what bedding is best? This study was done by Envirosystems and it compared which product was best for anaerobic digestion when mixed with slurry. They compared sawdust, limeash, gypsum, sand and envirobed. Envirobed was the best product!
http://www.envirosystems.co.uk/greatest-hydrogen-sulphide-risk-gypsum-bedding-mixed-slurry/

The gas yield of oat husk looks good! If it is any good for bedding! Long term going to investigate growing a crop if we can!

 

[Digester Man]

I thought a slurry only digester, had to be fed with slurry? Can you put bedding/FYM into it?

 

[Mucktogold]

Looks v.good. Looks like the whole container and its contents is ATEX rated.
80 kw how much does they sell for?

 

[mawleymoos]

It is only slurry! However if we can bed the cubicles with something better than sawdust, OMNI are happy with it! As long as everything flows in the slurry and most importantly is consistent every day!
As to the cost! This is their first one, so they done me a super deal! However I think what they are quoting at the moment, is quite a bit less per kw than the biolectric!

 

[thesilentone]

What is the history of OMNI ?

 

[Mucktogold]

It is OMNI's own 80 kw plant! We have 400 animals on slurry in the winter and 280 the rest of the year! Which is more slurry than the biolectric is designed for! They seem to be doing a top job! Cummings engine, 1200m3 s/s tank and Landia pumps !
The turbine only produces approx 1/3 of our electric but we also have a roof covered in solar doing another1/3! Which takes a bit of the shine of the digester! However they are hoping that the digester will stand on its own two feet without subs! So the bit of subs we get will offset the lower electric price!

Is it a pump or propellor mixer?

 

[mawleymoos]

I am not sure how long they have been going, but went to see some digesters that they have both built and are looking after! I must admit that I was nervous about spending so much money with them, but they haven't let us down yet!! They still have to get it running, but they seem to be doing a good job and not taking any shortcuts! As for the mixing, they are using a pump to circulate the digestate along with a submersible mixer opposite! They don't seem to be taking any chances, and want it to be a success as much as us!

 

[thesilentone]

I am not sure how long they have been going, but went to see some digesters that they have both built and are looking after! I must admit that I was nervous about spending so much money with them, but they haven't let us down yet!! They still have to get it running, but they seem to be doing a good job and not taking any shortcuts! As for the mixing, they are using a pump to circulate the digestate along with a submersible mixer opposite! They don't seem to be taking any chances, and want it to be a success as much as us!

With such a large investment and the necessity for long-term support, were you not a little cavalier in your decision making of tech supplier ?
As you have a notifiable project, then full CDM Regulations apply, these also run through design and long-term liability. Are all these bases covered for you long-term.

 

[thesilentone]

Does CDM apply to my construction project? This is a question we are asked on many of the construction projects we become involved with.


We also often hear from contractors, this isn’t a CDM project, or do we need this because this project isn’t a CDM as it is under 6 weeks.

The important thing to remember is that every project is a CDM project. The CDM regulations apply to every construction project in some way or another. Particularly for contractors, the CDM regulations will apply regardless of the length of the project.

The Construction (Design and Management) Regulations (CDM Regulations) are in place to improve health and safety, have competent people on site, have construction work properly planned, and focus on managing risks.

Does CDM apply to my construction project? Yes, the CDM regulations apply to every construction project.

The confusion lies in identifying a project as notifiable or non-notifiable under CDM. This is where the question of length comes in to play when considering if a project is notifiable under the CDM regulations.

Generally speaking, if a project is over 30 working days (or 500 person days) and not for a domestic client in their own home, then the project is notifiable.

If your project is notifiable, then there are a number of additional duties that apply, and as a client you must appoint a CDM coordinator and a principal contractor.

However, just because a project is non-notifiable, does not mean that the CDM regulations do not apply, or that there are no duties. If you are a client, designer, contractor or worker on any construction project, you have duties to comply with under the CDM regulations (along with the requirements of other health and safety regulations).

If you are a client, designer, contractor or worker on a notifiable construction project, then you will have additional duties to comply with under CDM. There is also a requirement for additional duty holders – the principal contractor and the CDM coordinator.

If you are a client, designer or contractor involved in construction projects, it is important you are familiar with your duties on both notifiable and non-notifiable projects, so can make sure you are complying with the CDM regulations no matter what the project size.

 

[mawleymoos]

As far as health and safety goes! My wife is a stickler with that and is working with the NFU and OMNI! As for design, omni are sorting that that side of the things out! They will and have been on site far less than 30 days! Isn't it sad when we are all encouraged to diversify, but the rules and regs make it awkward for the normal farmer!

 

[thesilentone]

As far as health and safety goes! My wife is a stickler with that and is working with the NFU and OMNI! As for design, omni are sorting that that side of the things out! They will and have been on site far less than 30 days! Isn't it sad when we are all encouraged to diversify, but the rules and regs make it awkward for the normal farmer!

Do you think farming should be exempt from these building regulations ?

 

[thesilentone]

They will and have been on site far less than 30 days!

I think you need to read the third paragraph again.

The important thing to remember is that every project is a CDM project. The CDM regulations apply to every construction project in some way or another. Particularly for contractors, the CDM regulations will apply regardless of the length of the project.

Could I draw your attention to: http://adbioresources.org/docs/bp-riskmanagement-jul2016-24ppa4_print.pdf

A useful basic check list - especially page 13 onwards.

 

[Mucktogold]

I,m confused.

Can anyone explain this? (Copied from the attached leaflet).

Type 52
Biogas(2)
WG1606

Fuel
Biogas(1) (= 60% CH4 + 40% CO2) thourgh airlock, solenoid valve and carbon filter.
Biogas (2) Purified biogas (34 MJ/m3)


Does it mean for the 52 kw Bioelectric digester you need to change biogas (methane and carbon dioxide) into purified methane?
How do you do that and much does it cost?