滚轴软压工艺耦合淀粉改性有机絮凝剂增效沼渣脱水工艺研究  

Study on Dewatering Process of Biogas Residue Enhanced by Rolling Soft Pressing Coupled with Starch Modified Organic Flocculant

作　　者：顾南南 Gu Nannan(Shanghai Environmental Sanitation Engineering Design Institute Co.,Ltd.,Shanghai 200232,China;Shanghai Institute for Design and Research on Environmental Engineering Co.,Ltd.,Shanghai 200232,China)

机构地区：[1]上海环境卫生工程设计院有限公司,上海200232 [2]上海市环境工程设计科学研究院有限公司,上海200232

出　　处：《广东化工》2024年第13期94-96,105,共4页Guangdong Chemical Industry

基　　金：上海市环境集团股份有限公司科研项目(A1HJ-HJY-0009-2022);上海市2022年度“科技创新行动计划”技术带头人计划项目(22XD1431900);上海市科委标准项目(22DZ2200200)。

摘　　要：本研究通过利用滚轴软压工艺耦合淀粉改性有机絮凝剂,开发一种新型的沼渣脱水技术,通过测定真空抽滤泥饼含水率、含固率和沼渣比阻等指标,评价不同淀粉和有机絮凝剂的比例及投加量对沼渣脱水性能的影响。结果表明,在比例为1∶0.5、投加量为0.4mg时淀粉改性有机絮凝剂使得沼渣的含水率下降至67.4%,过滤比阻下降了约63.6%,沼渣的脱水性能得到显著提高。分析调理前后的污泥ζ电位变化,发现沼渣|ζ|电位降至0.53 mV。通过改进传统辊压脱水技术,探究绝干量、进料固体含量及絮凝剂浓度,滚轴与滤膜之间的接触面积和挤压压力对脱水率的影响,得出最佳脱水工艺为:摩擦面积0.314 m^(2),挤压压力5 kg,绝干量33.3%,进料固体含量0.6%,絮凝剂浓度0.2%,可以使沼渣含固率达到39.63%,为该技术推广应用提供相应的工艺参数。In this study,a new technology of digestate dewatering was developed by coupling starch-modified organic flocculant with roller soft-pressing process.The effects of different proportions and dosages of starch and organic flocculant on digestate dewatering performance were evaluated by measuring the water content,solid content,and digestate specific resistance of the vacuum-filtered mud cake.The results showed that when the proportion was 1∶0.5 and the dosage was 0.4 mg,the starch-modified organic flocculant reduced the water content of the digestate to 67.4%,decreased the filter specific resistance by approximately 63.6%,and significantly improved digestate dewatering performance.Analysis of the change in zeta potential before and after conditioning revealed that the digestate|ζ|potential decreased to 0.53 mV.Through improvements to traditional roller pressing dewatering technology,the study investigated the effects of dry weight,feed solid content,flocculant concentration,contact area between the roller and filter membrane,and pressing pressure on the dewatering rate.The optimal dewatering process was determined to be:friction area 0.314 m^(2),pressing pressure 5 kg,dry weight 33.3%,feed solid content 0.6%,and flocculant concentration 0.2%.This process achieved a digestate solid content of 39.63%,providing relevant process parameters for the promotion and application of this technology.

关 键 词：沼渣 脱水 淀粉 有机絮凝剂 辊压脱水技术 

分 类 号：TQ[化学工程]