Its been some time since I have given an update as we have been hard at work re-configuring our whole system, including adding a new fish room, ripping out both the old fish room/grow room and the greenhouse to make way for our new system. The new fish room and grow room are 95% finished and the greenhouse is only about 50% finished but enough to grow plants.
As I mentioned in a previous post we are converting to a water based growing system with only a few media filled grow beds; my better half (Grace) wants them, I don't, so we get them. The grow room is all horizontal DWC in ducts Grace calls Duffy Ducts, with mostly T5s doing the growing. We had some left over LEDs so we are using them for the first 4 inches of growth before transplanting into the larger spaced ducts.
First are some pictures of the fish room we are now calling the "Engine Room" or "ER". Some things are not being shown as we have a patent in the works and don't want to show it until that is further along. That would mostly be the Bio-Filtration system. As can be seen in the picture looking directly into one of the fish tanks, the water is crystal clear. The chemistry is as good as it gets and we need to add more veggies as we increase the fish food towards its maximum. We currently have 75 fish at an average weight of 2 pounds. We know this because we weighed a sample of them as we moved them from the older system tanks. The largest one we weighed was 4 pounds 10 ounces.
You can click on any of these for a larger view.
This next one is a closeup of some fish. Mainly wanted to show how clear the water is.
Here is the Grow Room one week after renovation, 24 February 2014
12 days later, 8 March 2014
There are Nine 8-tube T5s covering 27 Ducts each with 6 holes. We rotate the timing on these lights so only 5 of them are lite at any one time in order to keep the heat to a manageable level. Each light is on for a total of 8 hours every 24 hours.
There are four 150 Watt fully adjustable LEDs covering 12 smaller ducts, each with 9 holes.
All the ducts are 4 feet in length.
The Greenhouse after renovation:
In addition, we have water plumbed to and from the greenhouse where we are doing vertical growing.
There we have an array of 7 vertical ducts each with 8 wide spaced holes, similar to the horizontal ducts in the grow room, except longer.
We have 4 of these arrays for a total of 224 positions currently full of Romaine lettuce which are just about ready for harvest after only a few weeks of growth.
Here is a picture taken two days ago of one of these arrays. Today, you cannot see the ducts for the leaves.
There are two of these arrays back-to-back setting over a 120 gallon sump tank. There are two sump tanks and two back-to-back arrays. The greenhouse has an East-West orientation and we have added additional diffuser plastic over the top of the almost clear polycarbonate windows.
Micro Farm
The above system is a proof-of-concept that we call a micro farm. It is fully scalable and we are currently tuning it and taking measurements as we adjust the food given to the fish. This will tell us how much food will grow how many plants. It will also tell us how to scale the various components in a larger system.
As we slowly increase the food we will start to push the filters, but we have already learned we don't have nearly enough plants for the nitrates we are generating. We have plans for this spring to add a hoop house with some more vertical growing systems in it in order to absorb the nitrates being generated. We will also be experimenting with growing tomatoes and peppers in water.
By knowing the total amount of fish weight and the exact amount of fish food we are giving the fish each day we know the percentage of food to fish weight. With that, the nitrate count and the square footage along with the number of plants, we have a metric for how many plants (leafy greens) we can grow with a given poundage of fish if fed at full daily dose of 1% to 1.5% of their body weight.
I don't want to turn this into a Commercial Aquaponics 101 so I will end here and await your comments.
Oliver