engleski

Settlement characteristics of saturated mechanical biological treated waste from Croatia

Mechanical biological treatment (MBT) technology was developed in Germany with the aim of reducing the amount of biodegradable waste before landfilling. MBT has several types of output products. Apart from useful and recyclable products, one type of waste from the MBT process cannot be used as waste fuel or recyclable material but is still quite rich in organic matter. This type of waste, called the methanogenic fraction, goes to a bioreactor landfill, where water is added and recirculated to accelerate and increase the biodegradation of the methanogenic fraction, after which biogas is extracted. The focus of this paper is to determine the settlement characteristics on a single wet specimen of the methanogenic fraction (particle size < 25 mm) from a Croatian MBT plant. In order to conduct the experiment, a 150 mm diameter oedometer cell was used. Continuous settlement measurements were performed in three points using two callipers and one calibrated linear transducer (LVDT). The results showed that, as the load of the specimen increases, the coefficient of consolidation and coefficient of permeability values decrease, making the material denser and, therefore, more challenging for water recirculation and biogas extraction.

Biodried waste, settlement characteristics, methanogenic fraction, oedometer test, consolidation coefficient, permeability

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