As on AD plant operator we are not PAS approved as we spread all digestate on our own holding and only use farm based feedstocks, no waste.
What is your feedstock?We're running a 499kw plant and expecting 9/10000m3 of digestate. We decided to put in a 4400m3 tank and had it insulated and with a gas tight lid. We took the decision that the extra cost would soon get paid back by hopefully using the feedstocks more efficiently.(we're hoping for extra 8% gas from same feedstocks) Also thought 6months(ish) would enable us to use more digestate( about 8% DM as we have no seperator) in the spring as most winter application is a bit of a waste of N.
We're also lucky that we can umbilical to over 600 acres so can do for circa £2/m3.
Your post does not read quite right Lee.A 500kw AD plant will have 10-12,000 tonnes of digestate to spread.
Do you mean liquor but you say digestate?
If its 'digestate' then it will come out of the plant as PAS approved so you tip in field piles to suit the size of the field with the application rate. My understanding is that all AD plants are PAS approved. If this one is not then I would not get involved as you could have the EA on your heels in a few years time as you need 'deployments' to field piles and then spread because its a 'waste' not a product your spreading.
Cost wise £1.50-1.70/tonne will get you a contractor with loader. You can do it yourself for about 50p/tonne less but may not be worth the hassle.
The big cost is the haulage of it and if your tipping in fields next to the AD plant up to fields 10 miles away and its about evenly proportioned then your looking at about £3.50/tonne delivered.
Generally if you budget on £5/tonne delivered and spread your about there unless of course all the land is next to the plant.
If you have no separator i would be surprised if you have no issues with solid banks of maize forming in your storage, a customer told me several years ago when he installed a new plant fed on maize and grass that there was no need for a separator, I questioned him as I do you now but was informed 'no need'. He was wrong and since had to install one.We're basing it on maize. We grew 480 acres in first year(only started feeding end November). We averaged just over 21t/acre. We're having 500ac for next year as well as 80ac grass. Currently ration is 22t Maize, 4t pig manure,1t chicken manure and 1t potatoes.
Was offered 600t Potatoes and 400t fodder beet but really needs chopping and washing-any ideas?
Ahh, bit of a different job that set up.Sorry Puntabrava but should have made it clearer that we have also got heating and insulation in"storage tank" as well as 4 mixers. As I said earlier this should hopefully enable us to get as much gas as possible out of feedstocks. DM in second tank is approx 8%.
The more expensive option of a second digester/ storage tank was considerable( approx 150k extra) but leads to no smell, increased efficiency and the ability to double capacity at a later date.
That is incorrect.