Processing method for zero discharge of wood chip washing waste water

The invention relates to a processing method for zero discharge of wood chip washing waste water, belonging to the technical field of the wood deep processing. The technical scheme of the invention is that: a wood chip washing circulating water system is operated as a closed-loop circulating system, without other water sources entering; bypass processing is implemented by adopting methods of flocculation, decolouration and solid impurity separation, without controlling a COD index; the circulating water quality satisfies technical requirements, and an external displacement is zero. On the basis of guaranteeing the technical requirements for the wood chip washing and the wood chip quality, the zero discharge for the waste water of the wood chip washing circulating water system is realized,the water consumption of the system is reduced, a rear-end waste water biochemical processing system is omitted, more than 80% of investment, more than 50% of operation cost and more than 80% of covering areas are reduced, th