MUSHROOM Extra spinner BUSINESS


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Many companies outside Europe produce compost for use on their own farms and for customers unable to produce compost themselves. A visit to a smaller-scale compost plant in Iran showed that it is often a question of making do as far as the mixing quality of the various materials used to produce phase 1 compost goes. The composters had switched from using a windrow system (100 ton phase 1 per week) to a bunker system prompted by the need to satisfy the growing demand for compost. They wanted to produce 150 ton per week and at the same time minimise the odour nuisance caused to the neighbours.


Bunkers are relatively cheap and quick to build, and the new system short- ened the fermentation time and succeeded in reducing the odour nuisance. What they didn’t think about was the fact that in a windrow system the compost is turned and mixed every two to three days, and therefore mixed a total of four to five times.


However, in a bunker system there is really only one chance to mix all the ingredients properly – at the moment that the chicken manure, gypsum and wet straw are combined in the mixer. But at this composting plant the investment required for a good mixing line was simply too high. So the owner and I sat down to devise a method of adapting the minimal design of the home-made mixing line so it could produce a reasonably acceptable blend of ingredients to produce homogenous compost. The solu- tion was found in an extra spinner in the right position. This mixing line logically works slower than its professional counterpart, especially when it turned out that the straw and chicken manure had to pass over the line twice. This was apparently not problematic for the structure as the extra spinner at the end of the mixing line has robust, rounded pins (see photo insert).


Now the neighbours and the customers are all satisfied! By Thei Staaks


theistaaks@gmail.com


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