Due to its high content of humic substances, compost from bio-waste improves the structure and fertility of soils serving also as a sink for CO₂. But compost is also contaminated with numerous compounds, for example, plastics, glass particles, etc., mostly due to incorrect sorting by the waste producer, that is, households. The contamination even increases when covering areas of a high population density as is also evident from experience in Germany with a steadily increasing proportion of bio-waste. Only compost with high quality and minimum contamination is an acceptable fertilizer. A structured interview of experts investigated which measures or combinations of measures are best suitable to reduce the rate of misplaced materials in the organic waste. Only responsible persons were interviewed whose municipalities extensively collect separately bio-waste since years and have a low rate of unwanted materials. The questions focus on the identification of the misplacements according to their kind and quantity, the respective collection system, the regional statutes and their enforcement as well as the kind and extent of public awareness measures. The respective necessary measures are being discussed. This systemic approach can be transferred to other regions that intend to collect large quantities of bio-waste separately.

由于腐殖质含量高，生物垃圾堆肥可改善土壤结构和肥力，同时还可以吸收 CO ₂. 但堆肥也被许多化合物污染，例如塑料、玻璃颗粒等，这主要是由于废物生产者，即家庭的错误分类造成的。当覆盖人口密度高的地区时，污染甚至会增加，这从德国的经验中也可以看出，生物废物的比例稳步增加。只有高质量和污染最少的堆肥才是可接受的肥料。对专家的结构化访谈调查了哪些措施或措施组合最适合降低有机废物中错放材料的比率。只有负责人接受了采访，他们的城市多年来广泛单独收集生物废物，并且不需要的材料率很低。问题的重点是根据错位的种类和数量、各自的收集系统、地区法规及其执行情况以及公众意识措施的种类和程度来识别错位。正在讨论各自的必要措施。这种系统方法可以转移到打算单独收集大量生物废物的其他地区。