The sewage sludge(S) and garden waste (dry Gd, wet Gw) were used as the feedstocks. Adopting the method of mesophilic anaerobic digestion (35℃), the different methane production and the conversion efficiency under different VS mixing ratio of sewage sludge and garden waste (1: 2, 1:3, and sole sewage sludge) were investigated. The results showed that, with the same amount of VS, the garden waste mixed with sewage sludge had significantly higher methane production and conversion efficiency than those of sole sewage sludge system. Mixing ratio of 1: 2 of wet garden waste (Gw) and sewage sludge had the highest methane production and the highest unit VS methane production (291. 58 mL · g-1 VS), which was 6. 27％ higher than that of dry garden waste(Gd) mixing system with same VS, and 14. 29％ higher than that of sole sludge system. Under this optimum mixing condition (Gw: S of 1: 2), the conversion efficiency of SCOD, dissolved carbohydrate, soluble protein and VS, increased 2. 28％, 10. 22％, 16. 89％ and 14. 70％ respectively comparing to that of sole sludge system. And higher conversion efficiency led to the higher methane production.%文章以污水处理厂污水污泥和干湿绿化废弃物(Gd,Gw)为研究对象,采用中温(35℃)共厌氧消化的方法,研究了干湿绿化废弃物与污水污泥(S) VS混合比分别为1:2,1:3时,与单纯污水污泥厌氧消化相比,在产甲烷量和溶解性有机物转化率上的差异,明确添加绿化废弃物对污水污泥厌氧消化性能的影响.研究结果表明,在相同VS条件下,绿化废弃物与污水污泥混合体系的甲烷产量与有机物转化率均明显高于单纯污水污泥体系;不同混合比对绿化废弃物和污水污泥共厌氧消化的甲烷产量有明显影响,且相同VS混合比的湿绿化废弃物较干绿化废弃物产甲烷量高;湿绿化废弃物与污水污泥VS混合比为1:2时,混合体系单位VS累积产甲烷量最高,达291. 58 mL · g-1VS,较污泥单独厌氧消化提高了14. 29％,较相同VS混合比干绿化废弃物提高了6. 27％;最优产气工况Gw:S为1:2时,SCOD和溶解性碳水化合物、溶解性蛋白质和VS的转化率较污泥单独厌氧消化分别提高了2. 28％, 10. 22％, 16. 89％和14. 70％.由于添加绿化废弃物后,混合体系相比单独污水污泥系统,提高了有机物转化效率,是其产甲烷量较高的根本原因.
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