本文選題：污泥 + 水熱��； 參考：《浙江大學(xué)學(xué)報(工學(xué)版)》2016年12期

【摘要】：采用低場核磁共振(LF-NMR)技術(shù)研究水熱處理對污泥水分分布的影響.通過研究水熱溫度、反應(yīng)時間、CaCl2與非離子型聚丙烯酰胺(PAM)添加量對污泥離心水的質(zhì)量分數(shù)的影響,確定最佳處理工況.結(jié)合泥餅水的質(zhì)量分數(shù)、氨氮(NH3-N)及溶解性化學(xué)需氧量(SCOD)分析,評價經(jīng)水熱處理后污泥樣品的脫水性能.研究水熱單一變量對污泥水分分布變化的影響.結(jié)果表明:反應(yīng)溫度的提高使得污泥中結(jié)合水和機械結(jié)合水均顯著降低;反應(yīng)時間的延長降低了污泥中的結(jié)合水比例;投放氯化鈣主要降低機械結(jié)合水的比例;PAM的添加量對水分分布影響較小.水熱正交實驗結(jié)果表明:在水熱溫度為230℃、處理時間為45min時,同時添加140mg/g干污泥(DS)CaCl2,在水熱處理后添加10-6 g/g DS PAM試劑的工況下,泥餅經(jīng)離心脫水后水的質(zhì)量分數(shù)由88.67%降至70.68%.與污泥原樣相比,懸浮液中的SCOD、NH3-N值大幅上升,說明污泥絮體中不溶的有機組分發(fā)生了水解,并改變了污泥的水分分布.
[Abstract]:The effect of hydrothermal treatment on sludge moisture distribution was studied by low field nuclear magnetic resonance (LF-NMRs) technique. By studying the effects of hydrothermal temperature, reaction time, CaCl2 and Nonionic polyacrylamide (Nonionic polyacrylamide) on the mass fraction of centrifugal water of sludge, the optimal treatment conditions were determined. Combined with the mass fraction of mud cake water, NH3-N) and dissolved chemical oxygen demand (SCODD) analysis, the dewatering performance of sludge samples after hydrothermal treatment was evaluated. The effect of single variable of water and heat on water distribution of sludge was studied. The results showed that the combined water and mechanically bound water in sludge decreased significantly with the increase of reaction temperature, and the proportion of binding water in sludge decreased with the prolongation of reaction time. The addition of calcium chloride mainly reduced the ratio of mechanically bound water to PAM and had little effect on the water distribution. The results of hydrothermal orthogonal experiment showed that the mass fraction of water decreased from 88.67% to 70.68% after centrifugal dehydration, when the hydrothermal temperature was 230 鈩，

本文編號：1956264