不同类型的外加碳源对污泥堆肥过程氮素损失的影响

以城市污泥为研究对象,采用葡萄糖、蔗糖、秸秆粉及其混合物作为外加碳源,研究了不同类型的外加碳源对堆肥系统一次发酵周期内氨气挥发的影响.探讨了碳源的降解效率与堆肥系统氮素损失的作用关系.结果表明,与对照试验氨气挥发总量相比（3.05 g/kg·ds）,单独添加葡萄糖（2.46 g/kg·ds）与蔗糖（2.17 g/kg·ds）均能控制氨气的挥发,但单独使用秸秆粉没有显著效果（3.1 g/kg·ds）.蔗糖与秸秆粉混合添加对高温期氨气挥发的控制效果最好（1.92 g/kg·ds）,堆肥系统中总氮损失由对照试验53.1％减少至27.7％;堆肥过程中氨气挥发与碳源的降解具有显著负相关性（R=-0.94,p＜0.005）,秸秆粉与葡萄糖、蔗糖混合添加增强了微生物对有机碳的降解能力,促进无机氮的固定作用,减少了氮素的损失.

Influence of Carbon-Rich Amendments on Nitrogen Losses During Sewage Sludge Composting

Different extra carbon sources （glucose, sucrose and straw powder）were added during sewage sludge composting. According to the results, separate add of the glucose（2.46 g/kg ds）and sucrose（2.17 g/kg ds） could reduce NH3 emission compared with the amount of NH3 emission（3.05 g/kg ds）. No significant reduction of nitrogen loss was found in the mixture of P3 amended with straw powder alone（3.1 g/kg ds）. Adding the mixture of sucrose and straw powder had significant effect on reducing ammonia emission（1.92 g/kg ds）. A good linear correlation between the carbon degradation rate and ammonia emission was found with correlation coefficients of -0. 94（p〈0. 005）. The combination of straw with glucose and sucrose could enhance the decomposition of organic carbon. The carbon source which has more readily degradable composition is helpful to nitrogen immobilization.