A modified AB process was used to treat municipal sewage in this paper in order to improve nitrogen and phosphorus removal efficiency by the traditional AB process.

According to producing practice,it must be carried through the technology reformation to adapt its special particularity,and satisfies the need of production.

Through repairing a pair of horizontally directional butted wells,the author proposes an effective process modification to solve tube plugging by salt crystals and by water insoluble in cavity,which is offered to mines for reference.

The problems and the process modification of the slime water system in Xinghuacun coal washery is introduced in this paper.

The quality of circulation cooling water has been obviously improved after the process reconstruction.

To make full use of existing facilities,process reconstruction line was proposed including high-efficiency coagulation treatment technology,high-efficiency cooling process,oil removal technology and biological filter which is the last guarding process after the analysis of the problems in existing treatment process of wastewater from oil extraction in oilfield,.