Post Last Edit by em2 at 3-11-2009 23:49
Saya da jumpa solution.....
Do-it-yourself BSF bucket bio-composter
A no-frills approachIntroducing the Black Soldier Fly Bucket Bio-composter v1.1, aminimalistic approach to black soldier fly composting. Despite it’slimitations I hope this simple DIY composter will inspire people to trytheir hand at attracting and culturing BSF grubs.
Each bucket will vary but the basic concept is the same.Vent Holes
I used a 1/2 inch flat drill bit for the vents, but a larger hole isacceptable. Smaller might work but the vent holes are the primaryentrance for the adult BSF and they might have difficulty with lessthan that. The pilot holes were drilled level with the bottom of theraised band that is near the top of the bucket. I put the vents therefor two reasons. 1) By placing them close to this “overhang” there issome protection from rain entering the bucket 2) The female BSF will beattracted to the scent coming from the vents and the protected spacescreated by the reinforced rim will present them with a good egg layingsite. I expect most of the eggs to be laid in these protected spaces.
Go slowly when drilling or you may tear up the overhang. I drilled very slowly and still chewed it up a little. 
On my particular bucket the reinforced rim was 3 to 4 inches belowthe top of the bucket, but it’s higher up on some buckets. Higher isbetter if you have a choice because as we all know, hot air rises. Toexhaust the dead space above my vents I drilled the singe hole that you can see in the photo of the finished composter.
Drainage
This composter doesn’t utilize acontinuous drain system. There is a drain hole on the side of thebucket and periodically you’ll need to tilt the bucket and let theaccumulated liquids drain out. I plugged mine with a cork.
I picked a place about 3-4 inches from thebottom so that when tilted all but a small amount of liquid will drainout. The bucket biocomposter can be placed at an angle in the openingof another 5 gallon bucket for draining. Handle this liquid or “tea”carefully and sanitize your hands afterward. The tea can be used asfertilizer, but I don’t have experience with that so you’ll need to doyour own research and testing.
Coconut Coir Liner
(The photos above are from version 1.0. In the newer version the drain hole is placed lower.)
Coir is made from the outer husks ofcoconuts and is commonly used for lining wire planters and hangingbaskets. I bought a flat piece at a garden shop about 1 inch thick andcut 3 disc shapes to fit the bucket. Coir is also available in looseform. I don’t think it matters which type you use, and I’m guessingthat about 3 inches of total material should work. Be careful if youcut it because it’s pretty tough. I set mine on a thick piece ofStyrofoam and “sawed” through it with a utility knife. I feel fortunateto have completed the task with all ten digits still intact.
The purpose of the coir liner is toprovide a space for liquid to accumulate without flooding the foodscraps that you’re composting. The BSF grubs cannot process the scrapswell if they’re submerged, and the liquid creates an anaerobicenvironment (no air) that encourages the growth of bad bacteria. BSFgrubs create an aerobic environment (with air) through the churningaction that happens when they feed. By maintaining aerobic conditionsyou will avoid imbalances that are easily recognized by offensiveodors. A balanced BSF colony smells like wet straw plus whatever foodyou’ve added recently.
The Lid
You can snap the lid into place on yourbucket composter but I don’t want to go through that process every timeI open and close the unit. A simple solution is to just set the lid ontop without pressing down and then secure it with small bungee cords asyou can see in the photo. My dog keeps raccoons and other scavengersaway so usually I don’t even use the bungees. Of course if you have adog it might be the worst scavenger of all.
The knob serves a more important functionthan the obvious one. I’ve observed BSF females laying eggs on the topof the lid on several occasions and by using the knob you can avoidcrushing the fragile eggs. It won’t be the primary area for egg layingbut there’s no good reason to crush good BSF eggs and the knob iseasier to handle anyway.
Avoiding Ants
In the photo above I’m using a barriercreated by setting the composter in a pan of water to prevent ants frominvading the contents. You can also set the bucket on a stand like astool and treat the legs to repel ants. Similarly you could suspend thebucket on a chain or rope.
One issue I didn’t consider with the waterpan is that the black soldier fly grubs that migrate out of the bucketmay drown. A possible solution is to put the bucket in a dry pan thatin turn sits in a larger pan with water.
The process of composting
I’ll go into detail about using the bucketcomposter on a separate page and I will add a link here when it’sready. The basic concepts will be the same as using a BioPod, just on asmaller scale and with a few addtional steps. During hot weather keepthe bucket in full shade, don’t overfeed, and if it begins to smell badyou’re doing something wrong. I expect I’ll be able to process about a half pound (.25kg) of foodscraps with this unit each day, or maybe a little more. This composterisn’t designed for high effeciency or high volume, it’s designed as anintroduction to bio-composting with black soldier fly grubs (Hermetiaillucens). If you enjoy this you’ll probably want to graduate to aBioPod or a more elaborate DIY system. On the other hand you might findthat this bucket design is all you need…
Harvesting Grubs
To harvest the mature BSF grubs you will need to periodically leavethe bucket in a tilted position. Alternatively you could mist theinside walls of the bucket and set the unit in a larger container witha layer of sawdust (not pressure treated), peat, or some other drybedding material. The moisture on the walls will allow the grubs toclimb vertically, exit via the vent holes, and onto the beddingmaterial. Assuming the bedding remains dry the grubs will not be ableto escape the catch pan.
source http://blacksoldierflyblog.com/ | 
Post time 14-10-2009 09:13 AM
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