Formerly, drilling cutting treated by vertical cutting dryer can centrifuge disharge to environment directly or bury deeply undergroud. But it is extremaly bad to the environment. There are many kinds of chemicals and heavy metal ion in the cuttings, They will sink into groudwater and pollute groudwater. The polluted water as water source is very bad to human beings.

Vertical cutting dryer and high speed centrifuge can reduce OOC less than 5%,But in many countries, the treated cutting still cannot discharge into enviroment. Other biologic treantment should be followed.still cannot discharge dischage directly. They just act as parts of waste management.