This is how it's all settling in. Should have had a control of some sort to see if the Aquaponics helps with growth. The look healthy enough though but it all looks kind of small.
These are the seeds I threw in.
09/06/2013
Sunday, June 9, 2013
Friday, May 24, 2013
Tuesday, May 7, 2013
Aquaponics - Lettuce
07/05/2013 08:06 Morning after planting
Aquaponics - Update
Where were we. The siphons weren't working and I needed to make gravel guards and add the gravel.
I managed to source a 4" bit of pipe that wasn't a 3m long. I used a bit of duct piping like you would use for putting a pipe through the wall for an extractor fan. You could probably find bits of offcut waving lying around the place though. The gravel I washed and put into the growbeds. I used purple slate. Bigger bits at the bottom and smaller at the top. No noticeable effect on the pond water and the fish haven't died so :) Time will tell if it is an effective grow medium.
I spent a lot of time on the siphons trying different things. What I didn't pick up on and what is very important in that the siphons need a certain amount of water to get going. I was fortunate enough to be able to turn up the amount of water a bit but still not enough to get the siphon going reliably. Enter Affnan. Affnan seems to be some kind of aquaponics genius. Reading his blog and seeing a lot of references to the Affnan siphon I decided to give it a go.
The basic idea is that you use a pipe reducer (although we are expanding) to increase the surface area of water flowing into the standpipe. This causes a Bernoulli effect (so Affnan says) which effectively means that the siphon can be started with less water flowing. The part I am using here is a 3/4" to 1 1/4" reducer. Why this is all still in imperial beats me.
One of the big impacts of the adding the reducer was that my bells no longer fit. Well they fit but there was no room for the water :) I had kind of expected this so I got the parts to make a larger 2" bell.
Bell parts:
You can also see that I went straight to the teeth technique we saw in the document about sipons. Much simpler and quicker that drilling holes. I also did not add a breather hole as it was not mentioned on the Affnan spec's. You may also notice that there is no snorkel in this design either. All in all this takes about 5 minutes to make.
After all that the siphons did not work well. One worked pretty well starting a stopping by itself. This was extremely lucky because I was getting fed up at this stage and was loosing faith in the whole thing.
I took the bell off the siphon and had a look at the water going into the stand pipe. What I noticed was that the water was tending to one side and this effectively meant that the water was pouring down one side of the pipe which was never going to block the pipe enough to create the changes in air pressure required to start the siphon. I levelled up the grow bed, previous ministrations where I was trying to cause a u-bend type airlock by raising the end of the outlet pipe had meant that the grow bed was a little off kilter. I straightened it out and checked the standpipe again. The water was flowing evenly down the sides of the pipe so you get a nice circle in the middle. I replaced the bell and guess what.
It worked.
And has continued to work now for the last 3-4 days.
Here it is finished.
I added some companion plants and some herbs at the ends were the grow beds didn't reach and I have planted some shop started lettuce (mostly because I am very impatient) and scattered some seeds. Fín.
I managed to source a 4" bit of pipe that wasn't a 3m long. I used a bit of duct piping like you would use for putting a pipe through the wall for an extractor fan. You could probably find bits of offcut waving lying around the place though. The gravel I washed and put into the growbeds. I used purple slate. Bigger bits at the bottom and smaller at the top. No noticeable effect on the pond water and the fish haven't died so :) Time will tell if it is an effective grow medium.
I spent a lot of time on the siphons trying different things. What I didn't pick up on and what is very important in that the siphons need a certain amount of water to get going. I was fortunate enough to be able to turn up the amount of water a bit but still not enough to get the siphon going reliably. Enter Affnan. Affnan seems to be some kind of aquaponics genius. Reading his blog and seeing a lot of references to the Affnan siphon I decided to give it a go.
The basic idea is that you use a pipe reducer (although we are expanding) to increase the surface area of water flowing into the standpipe. This causes a Bernoulli effect (so Affnan says) which effectively means that the siphon can be started with less water flowing. The part I am using here is a 3/4" to 1 1/4" reducer. Why this is all still in imperial beats me. 
One of the big impacts of the adding the reducer was that my bells no longer fit. Well they fit but there was no room for the water :) I had kind of expected this so I got the parts to make a larger 2" bell.
Bell parts:
- Length of 2" pipe
- 2" pipe cap
- Joiner for putting the cap on the 2" pipe
You can also see that I went straight to the teeth technique we saw in the document about sipons. Much simpler and quicker that drilling holes. I also did not add a breather hole as it was not mentioned on the Affnan spec's. You may also notice that there is no snorkel in this design either. All in all this takes about 5 minutes to make.
After all that the siphons did not work well. One worked pretty well starting a stopping by itself. This was extremely lucky because I was getting fed up at this stage and was loosing faith in the whole thing.
I took the bell off the siphon and had a look at the water going into the stand pipe. What I noticed was that the water was tending to one side and this effectively meant that the water was pouring down one side of the pipe which was never going to block the pipe enough to create the changes in air pressure required to start the siphon. I levelled up the grow bed, previous ministrations where I was trying to cause a u-bend type airlock by raising the end of the outlet pipe had meant that the grow bed was a little off kilter. I straightened it out and checked the standpipe again. The water was flowing evenly down the sides of the pipe so you get a nice circle in the middle. I replaced the bell and guess what.
It worked.
And has continued to work now for the last 3-4 days.
Here it is finished.
I added some companion plants and some herbs at the ends were the grow beds didn't reach and I have planted some shop started lettuce (mostly because I am very impatient) and scattered some seeds. Fín.
Saturday, May 4, 2013
Aquaponics - About
Right, I realise that I didn't really introduce the subject of aquaponics. I'll give a brief summary buy for further reading here's the wiki page http://en.wikipedia.org/wiki/Aquaponics :) Aquaponics is a combination of aquaculture, raising of fish, pawns, snails, etc. for food and hydroponics the growing of plants in water. Fish produce ammonia through their gills and poop which in fact can become toxic to them. Through bacteria action this ammonia can be converted to nitrites and then into nitrates.
 |
| source: http://aquaponicshowtodiy.landscapeideasandpicture.com/aquaponics-systems |
In many cases people raise edible fish so you can get both fish and plants from this kind of system.
There are only three inputs to an aquaponics system. Food for the fish, electricity for the pump and, every so often, water to top up the system.
There you have a brief introduction into aquaponics. There is actually loads of stuff on the internet about it. It seems quite popular else where.
Tuesday, April 30, 2013
Aquaponics
Not sure how or why but noticed this video on YouTube A beginner's Guide to building a Home Aquaponic System on a Low Budget. We have a pond with 4 koi carp in it that we needed to put a fence around so I figured why couldn't the fence be some aquaponic beds.
Now, those fittings are not easy to get here, so there I spent some time looking in generic hardware stores for the parts but ended up going to a local plumbing supplies place DPL. I have to say at this point that the guys here were excellent and very helpful in cobbling together the parts I needed for the system. It was a little different then in the video above, but it does seem to function as expected, although at this stage if any plants grow remains to be seen.
The parts I used to make the siphon are as follows:
Now ideally you would get bit closer to what he has in the video but I was trying to do it in a weekend and not have to order stuff in, in practice that probably would have been cheaper, easier and quicker, but who knew. I already had a pump for my pond so I was sorted there, definitely not the perfect pump for this but will do the job. With all the parts assembled (and still not quiet believing it would work at all) I tried it just holding the pipe filling the tank and low a behold it did actually work.
Now having done some things like this before I am all to aware of my own shortcomings and that I am not nearly as clever as these people on the interweb I was dubious of leaving it running without me watching. This raised issue for about the general operation of the system. You see, as it was not a closed system, i.e. if for some reason the siphons became blocked or the grow beds sprung a leak there was nothing to stop the pump from pumping all the water from my pond, burning itself out and killing my fish. Hmmm.
Thinking about this the first thing that springs to my is some sort of ballcock. Now, being filled with the joys of clever non-mechanical DIY siphons I shied away from buying a traditional ballcock. I figured I could make something similar. I came up with a number of prototypes and spent many evenings trying proofs of concept. All failed. I ended up buying a ballcock in the end. They are designed that way for a reason it would seem. You need the distance between the float and valve to create the kinds of force necessary to compete with the force of the water. Obvious no that you say it but was fun learning anyways.
To my dismay the purchased ballcock didn't work either. The rate of flow for a bog standard ballcock was simply not enough to cope with all the water my pump was moving so even fully open there was still water flowing up to the grow beds (not that I hooked them up at this stage). After two failed attempts at drilling out the valve on the one I had I resigned to wait until the weekend to get back to the guys at DPL to see if there was anything to be done.
Fortunately, there are various rates of flow decided by the piece I had tried to drill. Unfortunately they did not have the fastest flowing one as these has not been seen for at least 18 months. I settled on the red ones and got a few in case I tried my hand at expanding it once again.
Now the other this I did was reduce the amount of water flowing up to the grow beds, there was a bit of creative plumbing but I managed to arrange it so that I could tune the amount of water going up the pipes, this combined with the faster flowing ballcock dealt with my concerns for my fish.
I then proceeded to plumb in the actual grow beds and get the system going properly.
It did not. The water seemed to be constantly flowing out of the pipes. I played around with my siphons and realised that the siphon was never actually stopping. You see when I had been trying it I was only filling it up to the point where it stopped siphoning and then moved the pipe back into the pond, so the siphon was never running while the grow bed was filling. With the water coming in from the pump constantly there was enough to keep up with the siphon at the end once it slowed as it reached the bottom of the grow bed. This mean that the siphon never disengaged and it would constantly trickle out. Now I figured a hole above the main intake holes would sort this out but I needed some confirmation. I did some googling and found this very useful document regarding siphons, thanks to U of Hawaii. Now this document is great for explaining how to make a siphon. One of the things mentioned is a snorkel. Now you may have noticed, as I did, that there was no snorkel in the video, but there is a small how drilled above the other holes which serves the same purpose.
I adjusted my siphon but reducing the length of my stand pipe (not sure if this was a good idea). Changed my inlet holes to "teeth" as described in the document above and added a small hole. These changes seemed to have the desired effect.
I have noticed now that it is still not quite right. The siphons are not kicking in enough. I need to play with it some more. So, next jobs are to create a gravel guard and add the gravel.
Now, those fittings are not easy to get here, so there I spent some time looking in generic hardware stores for the parts but ended up going to a local plumbing supplies place DPL. I have to say at this point that the guys here were excellent and very helpful in cobbling together the parts I needed for the system. It was a little different then in the video above, but it does seem to function as expected, although at this stage if any plants grow remains to be seen.
The parts I used to make the siphon are as follows:
- 3/4"Straight Overflow Tank Connector
- A threaded elbow probably also a tank connector
- A threaded brass piece to join them
- A length of 25mm overflow pipe (length will depend on your grow bed size)
- A longer piece of 38mm pvc pipe
- 38mm pipe cap
- Joiner for pipe and cap
Now ideally you would get bit closer to what he has in the video but I was trying to do it in a weekend and not have to order stuff in, in practice that probably would have been cheaper, easier and quicker, but who knew. I already had a pump for my pond so I was sorted there, definitely not the perfect pump for this but will do the job. With all the parts assembled (and still not quiet believing it would work at all) I tried it just holding the pipe filling the tank and low a behold it did actually work.Now having done some things like this before I am all to aware of my own shortcomings and that I am not nearly as clever as these people on the interweb I was dubious of leaving it running without me watching. This raised issue for about the general operation of the system. You see, as it was not a closed system, i.e. if for some reason the siphons became blocked or the grow beds sprung a leak there was nothing to stop the pump from pumping all the water from my pond, burning itself out and killing my fish. Hmmm.
Thinking about this the first thing that springs to my is some sort of ballcock. Now, being filled with the joys of clever non-mechanical DIY siphons I shied away from buying a traditional ballcock. I figured I could make something similar. I came up with a number of prototypes and spent many evenings trying proofs of concept. All failed. I ended up buying a ballcock in the end. They are designed that way for a reason it would seem. You need the distance between the float and valve to create the kinds of force necessary to compete with the force of the water. Obvious no that you say it but was fun learning anyways.
To my dismay the purchased ballcock didn't work either. The rate of flow for a bog standard ballcock was simply not enough to cope with all the water my pump was moving so even fully open there was still water flowing up to the grow beds (not that I hooked them up at this stage). After two failed attempts at drilling out the valve on the one I had I resigned to wait until the weekend to get back to the guys at DPL to see if there was anything to be done.
Fortunately, there are various rates of flow decided by the piece I had tried to drill. Unfortunately they did not have the fastest flowing one as these has not been seen for at least 18 months. I settled on the red ones and got a few in case I tried my hand at expanding it once again.
I then proceeded to plumb in the actual grow beds and get the system going properly.
It did not. The water seemed to be constantly flowing out of the pipes. I played around with my siphons and realised that the siphon was never actually stopping. You see when I had been trying it I was only filling it up to the point where it stopped siphoning and then moved the pipe back into the pond, so the siphon was never running while the grow bed was filling. With the water coming in from the pump constantly there was enough to keep up with the siphon at the end once it slowed as it reached the bottom of the grow bed. This mean that the siphon never disengaged and it would constantly trickle out. Now I figured a hole above the main intake holes would sort this out but I needed some confirmation. I did some googling and found this very useful document regarding siphons, thanks to U of Hawaii. Now this document is great for explaining how to make a siphon. One of the things mentioned is a snorkel. Now you may have noticed, as I did, that there was no snorkel in the video, but there is a small how drilled above the other holes which serves the same purpose.I adjusted my siphon but reducing the length of my stand pipe (not sure if this was a good idea). Changed my inlet holes to "teeth" as described in the document above and added a small hole. These changes seemed to have the desired effect.
I have noticed now that it is still not quite right. The siphons are not kicking in enough. I need to play with it some more. So, next jobs are to create a gravel guard and add the gravel.
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