Blown bitumens like Mexphalte, with a high content of saturated hydrocarbons, are more easily biodegraded by microorganisms than direct distillation bitumen, with a low content of saturated hydrocarbons and a high content of aromatic hydrocarbons.
blˈoʊn bɪtˈuːmɛnz lˈaɪk mˈɛksfælt, wɪð ɐ hˈaɪ kˈɑːntɛnt ʌv sˈætʃɚɹˌeɪɾᵻd hˈaɪdɹəkˌɑːɹbənz, ɑːɹ mˈoːɹ ˈiːzili bˌaɪoʊdᵻɡɹˈeɪdᵻd baɪ mˌaɪkɹoʊˈɔːɹɡənˌɪzəmz ðɐn dᵻɹˈɛkt dɪstɪlˈeɪʃən bɪtˈuːmɛn, wɪð ɐ lˈoʊ kˈɑːntɛnt ʌv sˈætʃɚɹˌeɪɾᵻd hˈaɪdɹəkˌɑːɹbənz ænd ɐ hˈaɪ kˈɑːntɛnt ʌv ɚɹoʊmˈæɾɪk hˈaɪdɹəkˌɑːɹbənz.