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3.4. Production of CH4

In terms of the previous work (He et al., 2005b), the methane produced mainly in methanogenic reactor in the two-phase landfill system. Thus, the methane produced by the NBL and BL were only collected from the NBLM and BLM, respectively. The NBLM and BLM were fed with S5 and S4, respectively. The CH4 concentrations from both reactors reduced gradually with the decrease of COD concentrations in influents. Furthermore, the CH4 concen- tration from the NBLM was always lower than that from the BLM, corresponding to the COD concentration of S5 being lower than that of S4. During the first 151 days, the CH4 concentration decreased from initial 80.1% to 47.2% on day 151 in the BLM, while it reduced from initial70.2% to 13.6% in the NBLM. From day 151 onwards, the CH4 concentrations in the NBLM and BLM were below detection limit (data not shown).
The relationship between CH4 production and input COD load in the NBLM and BLM was further analyzed statistically. The correlation coefficient and regression equation are listed in Table 4. The results indicated that there existed linear relationship between CH4 production and input COD load, and there was no difference in con- version efficiency between the NBLM and BLM. However, the accumulative CH4 production from the BLM was 1.72 times higher than that from the NBLM because of denitri-fication in NBL consuming the organic matter.

3.4 。生产甲烷

无论在以前的工作（他等人， 2005å¹´b ） ，甲烷产生的，主要是在产甲烷反应器在两相填埋场系统。因此，甲烷所产生的nbl和BL只收集到nblm和国土管理局分别。该nblm和博莱霉素分别喂食S5和1018 ，分别。该甲烷浓度从反应堆逐渐减少与降低COD的浓度在fl uents 。此外，甲烷浓度处理的，从nblm始终低于从博莱霉素，相对应的COD浓度的中五低于是1018 。在第一151天，甲烷浓度降低，从最初的80.1 ％至47.2 ％ ，一天151在博莱霉素，而减少从initial70.2 ％至13.6 ％ ，而在nblm 。从第一天151起，将甲烷浓度在nblm和博莱霉素均低于检出限（数据未显示） 。
关系甲烷的生产和投入， COD负荷在nblm和博莱霉素是进一步统计分析。相关系数和回归方程列在表4 。结果表明，存在着线性关系，甲烷的生产和投入， COD负荷，并没有差异，在协商版本e ffi透射之间nblm和博莱霉素。不过，累积的甲烷产量从博莱霉素为1.72倍，高于从nblm因为denitri - fication在nbl消耗土壤有机质。
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