周顯[1]^,2，孫慧^1,2，童軍^1,2，鄭鄖^1,2，王昶¹

（1 長江水利委員會長江科學院，湖北武漢，430010

2 水利部巖土力學與工程重點實驗室，湖北武漢，430010）

摘要：工業(yè)廢渣的協(xié)同處置利用是當前環(huán)境治理和節(jié)能減排的重點，利用鋼渣基改性劑和三價鐵鹽復合調(diào)理，在達到污泥深度脫水的前提下，可同時對固體廢棄物做到資源化利用。為研究復合調(diào)理劑對市政污水污泥脫水性能的影響，本文采用雙因素響應面設計分析（中心復合設計）藥劑的最佳投配比降低污泥比阻（SRF）進行優(yōu)化設計。通過對SRF曲面方程二次多項回歸方程求解得知最佳配比，氯化鐵投加4.95%、改性劑M投加33%（投加量均以污泥干基計）時，SRF取得最小值4.467×107 s²/g。以最佳配比為投加量，探討了藥劑投加順序以及溫度對試驗結果的影響，發(fā)現(xiàn)先投加氯化鐵溶液效果較好；溫度對實驗體系的影響呈非線性變化，在17±2℃SRF取得最小值。最后，結合SEM掃描電鏡分析改性機理，改性后污泥絮體結構松散，呈多孔狀，有利于水分脫離。

關鍵詞：污泥改性；響應曲面優(yōu)化設計；污泥比阻；鋼渣

Effect of Ferric Salt andSteel Slag-Based Composite Modifier on SewageSludge Dewatering

ZHOU Xian¹,²，SUN Hui^1,2，TONG Jun^1,2，ZHENG Yun^1,2，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