It’s time to install the water pump, do the wiring, fill water into the tanks and do a test run to check for the aquaponics system operation.
Currently I hit a roadblock in building this aquaponics set. First is the leaking issue. It’s like everywhere is leaking, due to my usage of silicon sealant at the pipe connection. I decided to use sealant because I couldn’t find suitable pipe fittings for the tanks:
there are no uniseal sold here, even the regular rubber seal only have size up to 1.5 inch.
bulkhead fitting is quite expensive, and I only can find it sold online
2-inch PVC tank connector doesn’t fit with 2-inch UPVC
Another issue is the low water flow from the water pump. This probably cause by the leaking at the sump tank connection, and also maybe because of the head height (2 meters). Water from the pump is split to the fish tank and DWC. Pipe into the fish tank is around 90 cm height, so assuming the flow rate decrease is linear, at 0.9 meter, the water flow is theoretically 1100L/hour. Adding the split line to the DWC and all the elbows turn that add friction to the water flow, the value might be much lower. For now, I let the valve at the DWC slightly open and at the fish tank fully open, but only little flow is coming out to the fish tank.
I changed the arrangement of the tanks, and solid filter drain outlet now connected directly to the sump tank, to reuse the water while filtering out the solid waste.
All pipe connections are glued, and the connection to the tanks are sealed using silicon sealant. This is far from complete, as I still need to do test run & check for any leaking. Also need to make sure correct water flow from the sump to the fish tank and DWC.
Solid lifting overflow is designed to automatically clean the fish tank from solid waste by using circular water flow, which gather the waste at the center of the tank, then the standpipe will suck the solid out to the filter tanks.
At the bottom of the standpipe (see A), there are small holes for the water to flow and to prevent fish from entering it. When the water overflow at B, it will create small siphoning effect at A which carry the solid out of the fish tank. T connector is used at the standpipe to prevent full siphon effect from occurring which will drain the fish tank completely.
Bio filter provides extra biological surface area for nitrifying bacteria to convert ammonia into nitrite and then nitrate. Trickle filter works by dropping water from fish tank through some kind of trickler (see A in diagram above) onto bio media (see B) and bacteria living on these bio media will help the nitrification process. Trickle filter also helps in degassing process, when the water trickle down, it contact with the air and some gas inside the water will be released to the air, such as carbon dioxide and excess nitrogen.
I use colander to create the trickle effect. This colander will be covered with some cloth, which function to filter out fine solid that escape the radial flow filter. Bio media that I use is K1 bio media, however I only have 1kg of them, which occupies about 6 liters of volume, so I added together some clay pebbles I have around to increase the bio media volume. Both media are wrapped inside a mesh cloth.