davidroberts30
Member
- Location
- pembrokeshire
I've seen 96% acid in ibc for 600We add the acid pre-separator in a mixing tank, so we stop ammonia loss from the solids as well. The issue is then it tends to clump the fibres, making it hard to pump. We have found that only a piston pump (e.g. Houle) can cope after many tries.
It was supposed to be 5 kg/m3, but I find it to be about 16 kg to get to pH5.5 on our digestate. It will depend on the starting pH (we are about 7.8) and the buffering capacity of the slurry. We cannot get any more second user acid at the moment, and virgin acid is up to £750/tonne which makes it uneconomic.