Большой англо-русский и русско-английский словарь
precleaning, prerefining, coarse purification, primary purification, preliminary treatment
Англо-русский словарь технических терминов
precleaning, prerefining, coarse purification, primary purification,(сточных вод) preliminary treatment
Русско-английский политехнический словарь
precleaning, prerefining, coarse purification, primary purification,(сточных вод) preliminary treatment
Dictionnaire technique russo-italien
depurazione preliminare [preventiva], predepurazione f