The Optimization of Bamboo Heat Treatment Process
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摘要: 对竹材饱和蒸汽炭化热处理工艺参数进行了优化研究，分析其对竹材加工废水和竹材颜色的影响，试验结果表明，竹材热处理时间和饱和蒸气压对其废水排放量和COD值均呈正相关，即饱和蒸气压越高、处理时间越长，则废水排放量越多、COD值越高；且当饱和蒸汽压超过4.2 MPa·s时（对应热处理温度为250℃左右），竹材加工废水COD值跃增。通过色差L*、b*、ΔE*值与蒸煮饱和蒸气压和炭化时间的线性关系，建立竹材色差与热处理工艺的相关性数学模型，根据现有竹材产品颜色预估热处理工艺。具此分别对浅色系、中深色系、深色系加工竹材进行工艺优化，相比与传统工艺，优化竹材热处理工艺分别降低单位质量废水排放量11.53%、11.32%、12.5%，总有机物排放量分别降低51.91%、43.03%、28.56%，具有较好的实际生产指导意义。Abstract: In this paper,the heat treatment processes of bamboo,including cooking,bleaching and carbonization,were optimized. The results showed that when hydrogen peroxide was used as bleaching agent and pH was 9,the optimal treatment was obtained under the heat treatment at 70 ℃ for 60 min in 6% bleaching solution,the corresponding bamboo whiteness can increase by more than 12%,the bleaching bath solution for bamboo bundles can be reused for 8 to 10 cycles,and its COD could reach 60,000 mg·L-1. A correlation model between the bamboo whiteness (chromaticity) and the saturated vapor pressure and carbonization time was built. The chromaticity was analyzed by colorimeter.Combined with bamboo carbonization process,the chromatogram of bamboo carbonization process was established to guide the practical production. Compared with the traditional experience of saturated vapor pressure carbonization process,determination of carbonization process by means of prediction,the model can reduce a waste water emission by 11.32%-12.5%.
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Key words:
- Bamboo /
- Cooking /
- Bleaching /
- Carbonization
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