周显[1],2,孙慧1,2,童军1,2,郑郧1,2,王昶1
(1 长江水利委员会长江科学院,湖北武汉,430010
2 水利部岩土力学与工程重点实验室,湖北武汉,430010)
摘要:工业废渣的协同处置利用是当前环境治理和节能减排的重点,利用钢渣基改性剂和三价铁盐复合调理,在达到污泥深度脱水的前提下,可同时对固体废弃物做到资源化利用。为研究复合调理剂对市政污水污泥脱水性能的影响,本文采用双因素响应面设计分析(中心复合设计)药剂的最佳投配比降低污泥比阻(SRF)进行优化设计。通过对SRF曲面方程二次多项回归方程求解得知最佳配比,氯化铁投加4.95%、改性剂M投加33%(投加量均以污泥干基计)时,SRF取得最小值4.467×107 s2/g。以最佳配比为投加量,探讨了药剂投加顺序以及温度对试验结果的影响,发现先投加氯化铁溶液效果较好;温度对实验体系的影响呈非线性变化,在17±2℃SRF取得最小值。最后,结合SEM扫描电镜分析改性机理,改性后污泥絮体结构松散,呈多孔状,有利于水分脱离。
关键词:污泥改性;响应曲面优化设计;污泥比阻;钢渣
Effect of Ferric Salt andSteel Slag-Based Composite Modifier on SewageSludge Dewatering
ZHOU Xian1,2,SUN Hui1,2,TONG Jun1,2,ZHENG Yun1,2,WANG Chang1
(1 Yangtze River Scientific Research Institute, Wuhan 430010, China;
2 Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China)
Abstract:Industrialwaste co-processingisthe current technology emphasis ofenergy-saving and emission-reduction in environmental management. Use ferric chloride and SS (steel slag)-based modifier to improve the dewaterability of sludge, will not only improve the dewaterability of sludge, but also achieving the resource utilization of solid waste.In this paper, the sludge resistance filtration (SRF) was analyzed using response surface designexperiments (Central Composite Designs)with 2 factors to study the effect of ferric salt and industrial waste modifier on the sewage sludge dewatering.The optimum adding ratio of composite modifier with4.95% ferric salt and 33% industrial waste modifier (on the dry basis of sewage sludge) were obtained by using RSM quadratic regressionequation. The minimum SRF in the equation was 4.467×107s2/g. The effects of the treatment temperature and modifier adding order were also investigated by single factor experiments. The results indicated that 1)first the ferric salt then the industrial waste modifier sequence is significantly better than the opposite, 2)the effect of temperature on the experimental system was significant and nonlinear with the best condition at 17 ± 2 °C.The SEM results show that the floc structure of the sludge is irregularly formed after conditioning and a large number of pores are formed.
Keywords:sludge modification; response surface optimization design; sludge resistance filtration; steel slag
[1]基金项目:国家自然科学基金(51709017);中央级公益性科研院所基本科研业务费(CKSF2017045/YT、CKSF2017009/YT、CKSF2016044/YT)
作者简介:周显(1988—),男,博士,工程师,主要从事固体废物处理与资源化的研究