Process of wood pulp papermaking black liquor resourceful treatment

The invention belongs to the field of waste water treatment in environmental protection technology, and provides a process of wood pulp papermaking black liquor resourceful treatment. The process mainly comprises the following steps: (1) the wood pulp papermaking black liquor is treated by a plate type heat exchanger for heat transfer, and the temperature is controlled at 20-50 DEG C.; (2) the wood pulp papermaking black liquor is treated by a sand filter for coarse filtration; (3) the wood pulp papermaking black liquor is treated by a self-cleaning filter for precision filtering; (4) the wood pulp papermaking black liquor after fine filtration is treated by a nanofiltration membrane for filtering treatment; (5) the obtained nanofiltration membrane colature can be returned to a boiling workshop section for recycling of alkali, and after the obtained nanofiltration membrane concentrate is evaporated and concentrated, the concentrate can be used for exploitation of lignin series industrial products. The starting point of the invention is the treatment present situation and real demand of the wood pulp papermaking black liquor in our country, thereby realizing energy saving and emission reduction and recycling of pollutants in the wood pulp papermaking black liquor, and the invention has the advantages of wide range of application, advanced process, simple flow, reliable technology, reality application and popularization value.