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Activity 4.2

Operation, demonstration and optimisation of the prototype composting unit in the Municipality of Tinos

Activity 4.2 was initiated on July 28th, 2014, right after the completion and installation in the target area of the Municipality of Tinos, of the prototype composting unit as developed and designed during Activity 2.2.

Extensive work has been performed concerning complete physicochemical analysis of samples from pre-sorted biowaste. Moreover, compositional analyses was carried out in order to gather additional data, throughout the duration of the activity. Such analyses are considered of high importance since they provide feedback about the characteristics of the input material in the composting unit and are strongly connected with the quality of the end product (compost). During the duration of Activity 4.2, the operation and optimization of the prototype composting unit was also performed.

Figure 1 Biowaste are collected separately and treated in the prototype compositng unit in order to produce high quality compost

Figure 2 On site analyses to determine the composition of generated biowaste

On site analyses throughout the implementation phase of the biowaste source separation revealed the principal food waste categories found in collected biowaste per season. The average values are:

-       Meals (homemade and pre-cooked) : 12 %

-       Bread and bakery products: 8 %

-       Fruit waste: 26 %

-       Vegetables & salads: 38 %

Major conclusions:

 

  • The physico –chemical and biological characteristics of the final product satisfied the limits set by EoW 2014 for biodegradable waste subjected to biological treatment (compost&digestate):

- No pathogens

- Low heavy metals content in comparison with compost produced from mixed waste collection

  • Source separation is of significant importance, especially for the sensitive MSW fraction of biowaste, since separately collected organics exhibit high purity levels so as to facilitate any further treatment and thus the products received (compost) have better quality and greater value.
  • The recorded low impurities content (~1.5 %) demonstrate that the participating households practice effectively the source separation of the generated biowaste.