any advice of the best way to heat the influent.
I was thinking that it would have valves to turn on the heat for the mixer only for a little while each day.
I tried using the calculator but its a little difficult because we can get as much manure as needed for the project but i don't know how much gas to expect (seeing as how the gas in almost secondary for this system) or how fast our HRT will be.
We're building wooden boxes to house 5/8" aluminum coils that will be packed in with clay (here in north carolina we have plenty of metal rich red clay) that will interface with the plastic tanks.
We're concentrating more of the heat on the second cell to keep our methenogens happy.
The big questions right now are in regards to safety and designing the gas storage/usage system.
I am also interested to know if many experiments have been conducted regarding the behavior of oils in biodigesters.
Its interesting to hear that the acidogens don't require as much heat. At what temperatures do they work most effectively and what range of temperature can they survive?
I have a design for a gas delivery system that includes a gas bladder inside a container that will receive positive pressure when the pump kicks on from lack of heat. A certain amount of water will flow into the container and supply the required pressure for flow into the hot water heater. The water will drain back into the system after use.
I'm also very interested in sterling engines and the potential to produce electricity without having to go to the trouble of turbines and scrubbers. Do you have any experience with systems that use sterling engines or know of anyone else that is using them.
There are various so-called 'hybrid' designs in which there are multiple batch-fed 'first stages', which generate the "food" (volatile acids) for the methanogens in the biogas digester. And only the biogas digester needs to be carefully controlled for pH and temp -- a cost (and complexity) savings.
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