This study was carried out on mostly imported, processed petrocokes, which are also commercially known as "petcoke" or "petroleum coke". Petrocoke is imported in great amounts and is occasionally consumed domestically without conscientious thought. It is not a well-known material, though there is an idea of its genesis. The samples, their analysis, and their images are essential to be kept in mind for further investigations, since it is not an environmentally friendly material. Petrographic and chemical analyses were conducted on all samples. Trace element and FT-IR analyses were made on a few representative samples. It is possible to distinguish petrocokes from coal samples by means of coal petrography. Even mixtures of the petrocokes with coals can be detected very well. Some trace elements such as V, U, and Ni have much higher contents in petrocokes. They may cause environmental impacts.

In this study, the drying behaviour of tarhana consumed in Çankırı region was investigated with various drying methods and optimum drying conditions were determined using experimental Taguchi design method. Solar, conventional oven and microwave oven methods were used for drying purposes. Different temperatures and microwave powers were used in the ovens and tarhana was also dried under sun light. The effective drying parameters were examined concerning the tarhana in the thickness and varying drying period. The data obtained were subjected to variance analysis. Statistical significance was determined in terms of strength, temperature, thickness and time parameters. Conventional oven drying optimization was found to be more successful with the lower p value than 0.01. After drying, tarhana was analysed from humidity, ash, protein and colour values. The results were evaluated for the solar, oven or microwave dried samples.