Biological filter filler for VOCs (volatile organic compounds) and malodorous gas treatment and preparation method of biological filter filler

The invention discloses a preparation method of biological filter filler for VOCs (volatile organic compounds) and malodorous gas treatment. The method includes steps: (1) grinding fresh pine bark until the particle size reaches 2-6cm; (2) adding ground pine bark into a container, adding water to soak, adding sodium hydroxide being 3%-5% in mass concentration, keeping the temperature at 100 DEG Cfor 2-3h, changing water for cleaning after grease discharge is complete, adding acetic acid to adjust pH to 7, and draining; (3) adding white-rot fungi and nutritive salt into the pine bark treated in the step (2), composting and fermenting for 45-70 days to obtain the biological filter filler, wherein a maximum in-pile temperature is not higher than 65 DEG C, and the moisture content is controlled in a range of 55%-60%. The modified pine bark filler preparation method is simple and easy in operation and shortens pine bark fermentation time from 2-3 years to about 2 months to meet the requirement of industrial consum