剩余污泥和餐厨垃圾协同厌氧消化处理研究

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评估了不同剩余污泥和餐厨垃圾配比条件下的协同厌氧消化性能,如产水解、产酸、甲烷情况、厌氧消化系统稳定性以及消化沼液的脱水性能。确定了协同厌氧消化系统中剩余污泥和餐厨垃圾的最佳混合比例。研究结果表明,从产甲烷量的角度,剩余污泥和餐厨垃圾的最佳物料配比为1∶0.5,其中单位沼气产量为991.7 mL/gVS,甲烷产量为527.6 mL/gVS;从协同效益的角度,剩余污泥和餐厨垃圾的最佳物料配比为1∶1,其协同效益高达315.3%。协同厌氧消化组消化过程中的VFA浓度都在正常范围内。污泥和餐厨垃圾协同厌氧消化后的毛细吸水时间与污泥单独消化组相比变化不大,表明餐厨垃圾添加不会对共消化组消化沼液的脱水性能造成显著性的负面影响。

The acceleration of urbanization leads to the large-scale production of organic solid waste(such as waste activated sludge and food waste).Anaerobic digestion is an environmentally friendly and economical means for organic solid waste recycling treatment.Due to the low organic matter content in the sludge and the rich content of organic matter in food waste,co-digestion of waste activated sludge and food waste is advantageous in the nutrient balance,and it can also effectively overcome the disadvantage of acidification caused by high organic loading rates.On this basis,this study comprehensive evaluated the co-digestive performances such as hydrolysis,acidogenesis,system stability and the digestate slurry dewatering performance,etc.,at different waste activated sludge and food waste ratio,and determined optimal ratios of waste activated sludge and kitchen based on VS.The results showed that on the view of obtaining highest methane yields,the ratio of 1∶0.5 obtained the highest cumulative specific biogas yield(991.7 mL/gVS)and methane yield(527.6 mL/gVS).On the view of obtaining highest synergistic benefit,the ratio of 1∶1 obtained the highest synergistic benefit,whose value was as high as 315.3%.During the co-digestion process,the VFA concentrations were all within the normal range.The capillary suction time(CST)of co-digestion did not change significantly compared with that of the sludge mono-digestion,indicating that the addition of food waste would not have a significant negative impact on the dewatering performance of digester in the co-digestion.