Circular Utilization of Discarded Oyster Farming Bamboo Scaffolding in Pulp and Papermaking

Abstract Oyster Farming is one of the important fisheries and aquaculture industries in Taiwan. Each year, approximately 4,000~5,000 tons of discarded bamboo scaffolding (BS) used in oyster farming, are generated. In this context, the treatment and circular utilization of these materials should be taken seriously. This study evaluates the suitability of BS for pulp and papermaking by assessing the chemical compositions, microstructural appearance, and fiber morphology. The pulping properties of BS is investigated by soda pulping. The chemical composition of BS shows the potential for application in pulping. The appearance presents pores and the structure that can enhance pulping reactions, while the fiber morphology indicates the possibility of producing high-strength paper. Through the factorial experiment analysis of soda pulping, it demonstrated that BS is suitable for pulping with lower NaOH dosage and longer digestion time. Among these conditions, the condition at 170°C with 14% NaOH dosage for 90 min digestion has the highest pulping yield in this study. After refining the highest pulping yield BS pulp, with a Hollander beater for 60 min to adjust the freeness, the resulting pulp, when blended into the TOCC pulp, exhibits higher freeness, as well as improved strength and bulk properties of handsheet. The handsheets can achieve the strength property standards required for cardboard, without the chemical additives. In summary, BS exhibits the potential for pulping application and can be blended with OCC pulp to produce cardboard paper, thereby enhancing the circular utilization value of discarded oyster farming bamboo scaffolding in Taiwan.