刘建新 杨远秀 黄弦

摘要 [目的]研究稻秆与剩余污泥厌氧发酵产酸性能。[方法]在总固体浓度为20 g/L条件下，用一定比例的稻秆代替部分剩余污泥，构建共发酵产酸系统，探讨其有机物组分变化及其产酸特性。[结果]稻秆的投加能够促进多糖和蛋白溶出，提高SCOD含量，在发酵进行到第4天时，10%预处理稻秆处理和10%稻秆处理发酵体系中SCOD达到最高，分别为3 440和2 810 mgCOD/L，与污泥对照相比，分别升高了72.0%和40.5%。与此同时，在发酵结束时，稻秆的投加虽没有增加VFAs积累量，但其在短期内能够促进VFAs转化，缩短发酵时间，在发酵进行到第6天时，与污泥对照组相比，10%预处理稻秆处理中VFAs积累量提升了70.1%。当VFAs积累量趋于稳定时，乙酸和丙酸占总酸的比例和从大到小依次为10%预处理稻秆处理、10%稻秆处理、污泥对照。[结论]稻秆的投加能够改善污泥厌氧发酵产酸性能，可为农业废物的资源化利用提供一种有效途径。

关键词 稻秆；剩余污泥；共发酵；挥发性脂肪酸；产酸性能

中图分类号 X703 文献标识码 A 文章编号 0517-6611（2017）34-0056-03

Abstract [Objective]To analyze the acidproducing properties of anaerobic fermentation of rice straw and sewage sludge.[Method]Under the condition of total solid concentration of 20 g/L for experiment beginning，the cofermentation system which part of sewage sludge was replaced by a certain proportion of rice straw was constructed.[Result]The change of organic components and acidproducing properties during fermentation process was explored，when 10% rice straw dosing （rice straw mass/mass of rice straw and sludge mixture=1：10） and 10% pretreated rice straw added in the fermentation system，respectively.The results showed that the addition of rice straw could promote the dissolution of polysaccharides and protein content and increase the SCOD content.At the 4th day of fermentation，the highest SCOD was achieved in the cofermentation system.The SCOD content in 10% pretreated rice straw experiment group and 10% rice straw experiment was 3 440 mg COD/L and 2 810 mg COD/L，which increased by 72.0% and 40.5%，respectively，compared with the sludge control.Meanwhile，at the end of fermentation，the addition of rice straw did not increase the accumulation of VFAs，but it could promote the conversion of VFAs in the short term and decrease the fermentation period.Compared with the sludge control group at the 6th day of fermentation，the accumulation of VFAs in pretreated rice straw experiment group increased by 70.1%.When amount of VFAs accumulation stabilized，the ratio of acetic acid and propionic acid to total acid and from large to small were as follows 10% pretreated rice straw experiment group，10% rice straw experiment group，sludge control group.[Conclusion]The addition of rice straw could improve anaerobic fermentation performance of sewage sludge and provide a effective way in utilization of waste resource of agriculture.

Key words Rice straw；Sewage sludge；Cofermentation；VFAs；Anaerobic acidification performance

隨着城镇化建设的不断推进和人口的不断增加，剩余污泥是城镇污水处理过程中不可避免的产物，其产量也相应地增大。而剩余污泥成分复杂，含有大量有机物和重金属等。当前剩余污泥处理存在处置效率低、处理效果差及处理成本高等问题，剩余污泥合理有效的处置一直以来是棘手的问题[1-3]。

剩余污泥主要由微生物细胞等可被生物降解的有机组分构成，基于其组分特点，可利用……