results

[questionary]    [recovery rates]    ["impurities" in biobin]    [processing]    [BDP composts]

Use of BDP composts

The quality of the composts produced from Kassel organic wastes was supervised continuously during the pilot project. This involved qualitative monthly analyses campaigns related to their nutrient and pollutant levels in accordance with RAL-GZ 251. The results were compared with those of a reference analysis carried out before treatment with BDPs. The co-composting of BDPs did not affect the quality of produced composts.

An agricultural application test with matured compost made from organic wastes containing 1 wt % of BDP was performed. The trials compared the fertilizing effects of matured compost, made with or without BDP, with that of a mineral-based fertilizer applied in accordance with best practice as well as with a non-fertilized control. The compost was applied to the soil at an equivalent of 30 tons of dry mass / hectare.

Yields of Chinese cabbage grown with matured compost made from organic wastes containing BDP proved to be normal. They matched those of Chinese cabbage grown with matured compost from organic waste without BDP, and its mineral counterpart applied in accordance with best practice.The addition of BDP into the organic wastes related to produced composts was not found to affect either the yield or the quality parameter of the Chinese cabbage. Nor did the use of matured compost from organic waste containing certified BDP have any effect on soil properties.

The trials showed, therefore, that BDPs can be recycled by common recovery and composting with municipal organic waste. The resultant quality-assured and thus high-quality compost is suitable for agricultural purposes.