固化/稳定化处理污泥填埋气液转化模式

Laws of gas production and liquid transformation solidification /stabilization sludge landfill

固化/稳定化污泥进行填埋产生填埋气,产气规律是指导填埋气收集处理系统设计的重要依据。通过构建大型填埋柱模拟填埋实验,研究不同固化材料添加量污泥气液转化规律。实验结果表明,原泥和固化污泥产气规律分为2种类型:前期产气速率呈线性增加,达到最大速率后产气速率呈指数降低。低添加量的固化污泥,产气分3个阶段,分别为产气抑制期、增长期和衰减期。高添加量固化污泥,产气只有一个阶段,产气速率随着时间推移逐渐减小,产气量很小。固化污泥降解过程就是有机质含量降低,气体产量、含水率增加相互转化过程,达到固化材料添加量25%时,水分和气体产生量均很小,降解受到很强抑制,产气150 d左右稳定,产气量很小,无需单独设置气体收集系统。

In this study,the law of gases generated from solidification sludge landfill tests and the effect of solidified materials content was investigated using a large landfill column. The results showed that the gas yield and compositions were varied with solidified materials content and also displayed different gas production laws. It could be divided into three stages,which were inhibition stage,increasing stage and declining stage with low solidified materials content( 4% ~ 8%). While the high solidified materials content( 12% ~ 30%) was completely different appearance. It was just one stage and the rate of gas yield decreased with increasing retention time. Furthermore,the degradation of solidified sludge in landfills was actually a solid-liquid-gas three phase transformation process,which was organic matter in sludge was decreasing and gas yield and water content increasing process in detail. Especially when solidified materials content was 25%,the water and gas yield was very low meaning the degradation of organic matter was almost completely suppressed,and which also indicated that the landfill systems may not require gas collection and emission system when filled with all solidification sludge.