More than 50％ of the city waste were wet garbage containing organic matters as fiber,bamboo,kitchen vegetable wastes,etc.This approach was to mix the wet garbage with pig manure for anaerobic fermentation,so that to find a effective way for recycle use of wet garbage.Smashing and stirring the collected kitchen leftovers,leaves,peel rotten fruit and then mixed with pig manure in different ratio at 55℃,parameters of biogas yield,methane content,SCOD and alkalinity in biogas slurry,were measured and analyzed.The resuhs showed that the mixing ratio had significant effect on gas production.A proper mixing ratio could not only increase the total gas production,but also increase the methane content.In this experiment,the optimum pig manure and wet garbage mixing ratio was 4∶ 3,which increased total gas production by 79％ comparing with the sole pig manure fermentation,increased the SCOD removal rate by 12％,and only need 3 days for starting up successfully.The methane content was maintained at about 60％ until the end of fermentation.%湿垃圾主要是纤维、竹木、厨房菜渣等含有机物成分的废弃物,城市生活垃圾中50％以上为湿垃圾,且逐年增长,湿垃圾的处理问题刻不容缓.文章提出将湿垃圾与猪粪进行混合厌氧发酵,旨在为湿垃圾的循环利用提供新途径.将菜叶、剩饭、果皮、烂水果收集粉碎搅匀后,与猪粪按照不同比例混合于55℃下发酵,通过分析配比率对沼气产量、甲烷含量、沼液SCOD和碱度的影响,探究该处理方法的可行性以及混合发酵和单一发酵间的差别,优化发酵的条件.结果表明:原料配比率对产气有显著影响,合适的配比率不仅能提高总产气量还能提高甲烷含量,湿垃圾的添加比例过高时则会对发酵产生抑制作用.具体表现为猪粪和湿垃圾的配比率为4∶3时最适宜,相对猪粪单一发酵,总产气量可以提高79％,SCOD去除率可以提高12％,仅需3天便可成功启动,随后甲烷含量稳定维持在60％左右直到产气结束.
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