Medium-density fiber board production wastewater treatment process

Abstract

The invention relates to a medium-density fiber board production wastewater treatment process, comprising the following steps: separating large granular sawdust and sand from wastewater via a screening device and a centrifugal device in sequence; delivering the filtrate to a falling film evaporator for pre-evaporation concentration, wherein the heat source steam of the falling film evaporator is compressed by adopting a mechanical steam compressor for recycling; delivering the pre-concentrated liquid to a forced circulation evaporator for evaporative concentration; delivering the concentrated liquid to a medium-density fiber board production line to be used as a production raw material for medium-density fiber boards; delivering the condensed water generated by evaporative concentration to the medium-density fiber board production line to be used as a water source for process steam production of medium-density fiber board production; and burning solid wastes to produce heat serving as a heat source for process steam production of medium-density fiber board production. By combining a production wastewater treatment process with a medium-density fiber board production process, the wastewater is recycled and zero discharge is achieved.

Description

technical field [0001] The invention belongs to the technical field of medium density fiberboard production wastewater treatment, in particular to a medium density fiberboard production wastewater treatment process. Background technique [0002] Medium Density Fiberboard (MDF-Medium Density Fiberboard) is a kind of man-made board made by mechanically separating and chemically treating wood or plant fibers, adding adhesives and waterproofing agents, etc., and then molding under high temperature and high pressure. Ideal wood-based panels. The structure of medium-density fiberboard is more uniform than that of natural wood, and it also avoids problems such as decay and insects. At the same time, it has small expansion and contraction and is easy to process. Due to the flat surface of MDF, it is easy to paste various finishes, which can make the finished furniture more beautiful. In terms of bending strength and impact strength, it is superior to particleboard. [0003] my co...

AI Technical Summary

Problems solved by technology

At present, biochemical treatment is mainly used in China. However, due to different process choices and different seasons, it is very common that the treatment results are not up to standard and discharged into municipal sewage treatment and rivers. In some places, they are even directly discharged into rivers, causing serious pollution.

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