壳类生物质释碳性能研究

Study on carbon release performance of shells biomass

以核桃壳、夏威夷果壳、杏仁壳、花生壳、开心果壳和板栗壳6种壳类生物质作为反硝化碳源的备选材料,通过静态碳释放实验测定其释碳量和反硝化实验测定其对硝酸盐氮的去除效率,旨在优选出适于推广的反硝化固体碳源。结果表明,花生壳和板栗壳释碳量最高,但因质地疏松而持续力不足,导致脱氮效果差;开心果壳释碳速率缓慢但持续力强,可作为缓效碳源;核桃壳和夏威夷果壳释碳量较高,且结构稳定,释碳过程满足二级动力学方程,适合作为反硝化固体碳源。实验初步优选出核桃壳和夏威夷果壳可作为经济有效的具有支撑作用的固体碳源。

Shells biomass including walnut shells, macadamia nut shells, almond shells, peanut shells, pistachio shells and chestnut shells were selected as potential carbon sources for denitrification. The quantity of the organic carbon was detected by static carbon release experiments and nitrate removal efficiency was obtained by denitrification experiments to select the suitable solid carbon sources for denitrification. The results showed that carbon release amount of peanut shells and chestnut shells were the highest in six kinds of shells biomass. But both of them were un- sustainable because of the loose structure as well as poor denitrification efficiency. Pistachio shells with slow carbon release rate but strong durative ability can be used as a slow-release carbon source. High amount of carbon release and stable structure were found when walnut shells and macadamia nut shells were used as carbon source and the process of carbon release met secondary dynamics equation. Walnut shells and macadamia nut shells were recommended as economical,effective external carbon sources with supporting role for denitrification.