T/CNFPIA 4022-2025 Guideline for available techniques of pollution prevention and control for wood-based panel industr

Scope

This document specifies the feasible technologies for preventing and controlling environmental pollution from wastewater, waste gas, solid waste, and noise in the wood-based panel industry. This document can be used as a reference for environmental impact assessments, the revision and implementation of pollutant emission standards, pollution permit management, and the selection of pollution prevention and control technologies for wood-based panel industrial enterprises or production facility construction projects. For wood-based panel industrial units that implement GB 13271 *Emission Standards for Air Pollutants from Boilers* or GB 31572 *Emission Standards for Industrial Pollutants from Synthetic Resins*, the production facilities and emission outlets are not subject to this document. 4. Production Processes and Pollution Sources 4.1 Plywood The plywood production process includes material preparation, rotary cutting (planing), drying, veneer finishing, adhesive preparation, adhesive application (spraying), panel assembly, pre-pressing, hot pressing, sanding, and sawing. Waste gas is generated during the drying, adhesive preparation, adhesive application (spraying), hot pressing, sanding, and sawing processes. The main pollutants include particulate matter, formaldehyde, and other VOCs. Wastewater is generated during material preparation (log steaming and spraying), adhesive preparation and application equipment cleaning. The main pollution indicators or pollutants include color, chemical oxygen demand (CODcr), five-day biochemical oxygen demand (BOD5), suspended solids (SS), ammonia nitrogen, total nitrogen, total phosphorus, and formaldehyde. Solid waste is generated during rotary cutting (planing), veneer finishing, adhesive preparation, adhesive application (spraying), sanding, and sawing. The main pollutants include wood cores, wood chips, panel strips, slag, sludge, and auxiliary packaging materials. Noise is generated during material pre

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