氧化镁作亚硫酸镁盐浆氧漂的保护剂

进行亚硫酸镁盐法浆（下称镁盐浆）的氧气漂白（Ｏ）试验，氧漂浆的过氧乙酸（ＰＡ）预处理和Ｈ２Ｏ２漂白（Ｐ）试验，以及样品的傅立叶变换红外光谱、Ｘ－射线衍射研究．结果证明，添加ＭｇＯ的氧漂浆，在白度、粘度、结晶度等方面均优于添加ＭｇＳＯ４的氧漂浆；应用Ｏ′ＫＩ法红外结晶指数及Ｘ－射线衍射法结晶度均能较好地反映样品的结晶结构变化．Ｏ－ＰＡ－Ｐ漂白流程为实现镁盐浆全无氯、短序、高白度漂白提供一种有效途径．     

Removal of TOC and Color in Bleaching Effluents from Straw Pulp and Paper Mill by Fe^0- H2O2 Process

TOC and color in the bleaching effluent from straw pulp paper process could not reach draining standard after its treatment by a biochemical process. In this study, advanced treatment by integrated micro-electrolysis （Fe^0） method and Fenton-like process was investigated under various conditions, i.e. pH, Fe/C ratio, initial I-I2O2 concentration and carrier gas. Results showed that Fe/C ratio（V/V = 1.5）, larger H2O2 dosage around 50 rag/L, lower pH（pH= 3） turned out to be particularly efficient. Temperature was a key parameter, remarkably increasing reaction rates. Carrier air not only improved reaction efficiency, but also saved H2O2 dosage. Chlorinated organic compounds could be reductive dechlorinated by Fe^0 reaction and oxidated by OH produced from Fenton process. The combination of Fe^0 and H2O2 reactions had been proved to be highly effective for the advanced treatment of such a type of wastewaters, and important advantages concerning the application in the study.     

空管糊剂与干髓剂治疗乳磨牙牙髓炎和根尖周围炎的临床观察

采用空管糊剂与干髓剂对394颗乳磨牙牙髓炎和根尖周炎进行治疗观察,并经过半年至2年的随访.结果表明:空管糊剂疗法治疗乳磨牙牙髓炎和根尖周炎,有效率为97.12%,干髓剂治疗有效率为86.42%.经统计学处理两组疗效有显著性差异,P<0.05.     

EXAMINATION OF POLYCHLORINATED DIBENZO-P-DIOXINS AND POLYCHLORINATED DIBENZOFURANS INTO PROCESS WATER OF KRAFT PULP BLEACHING MILL FROM ASPECT OF ENVIRONMENTAL WATER QUALITY

INTRODUCTIONDuring the 1980s, the fact that chlorine used for pulp bleaching is connected to the release of dioxins1 and chloroform2 into the environment was proven in Canada and other countries. Since that time, each papermaking company has also been implementing a variety of policies designed to reduce dioxins generation. However, the Law Concerning Special Measures against Dioxins took effect in Japan on 15th January 2000. According to the new law, "kraft pulp and sulfite pulp bleac…     

荻苇硫酸盐浆漆酶/介体体系生物漂白

以 1-羟基苯并三唑 (HBT)为漆酶 (EC 1.10 .3.2 )A和漆酶B的氧化还原介体构建漆酶 /介体体系 (Laccase/MediatorSystem ,简称LMS) ,用LMS生物漂白荻苇硫酸盐浆 ,再经碱处理后测定纸浆的卡伯值和粘度值 .测定结果证实了LMS生物漂白具有极好的选择性 ,LMSB 比LMSA 具有更好的脱木素效果 .由漆酶A、B的紫外 -可见光谱分析得知 ,LMSB 比LMSA 具有更好的脱木素作用可能是由于每个漆酶B分子含有的芳香族氨基酸比每个漆酶A的少 ,漆酶B与 1-羟基苯并三唑自由基 (HBT·)的反应程度较低 ,有利于HBT·与浆中残余木素的反应     

二相UASB反应器处理碱法草浆黑液

采用二相ＵＡＳＢ反应器处理碱法草浆黑液,酸化相为８．８７Ｌ的普通升流式反应器,甲烷相为２８．７５Ｌ的ＵＡＳＢ反应器,系统温度（３５±１）℃,结果表明;当酸化要进水ＣＯＤ浓度为４．０７９３－９．１９８５ｇ．Ｌ＾－１,ＣＯＤ的负荷平均值为３８．８４ｋｇ．（ｍ＾３．ｄ）－１时,ＣＯＤ的总去除率为７２．７６％;系统对负荷的冲击有较强的耐受能力。     

碱抽提强化的麦草浆二氧化氯漂白及ECF漂白流程研究

摘要：采用四种不同的碱抽提方式对麦草浆二氧化氯漂白(D0)进行强化,考查了不同碱抽提方式的强化效果,并对不同ECF漂白流程进行了对比研究。结果表明：在D0ED1漂白流程中,不同碱抽提方式对D0木素的修饰效果不同,就后续D1漂段而言,四种不同碱抽提模式下纸浆的可漂性顺序为：D0EOP>D0EP>D0EO>D0E。在D0ED1漂白流程中,D1段ClO2对白度的提升是有限的,达到白度极限后再增加ClO2用量对白度提高不明显。本实验条件下D1段ClO2用量以1.0%~1.2%为佳。从D0ED1与D0EP各漂白流程的对比来看,在终段漂白中以P取代D1效果要好,表明H2O2用于终段漂白其效果要好于ClO2。从其它ECF漂白流程的对比来看,D0EPP和D0EOPP流程漂白效果优于其它流程。本实验条件下采用D0EPP和D0EOPP漂白流程,麦草浆漂后白度可分别达到83.8%和85.7%。     

压力筛内部纸浆悬浮液流场的数值模拟

为了克服废纸浆压力筛筛浆过程中孔、缝堵塞问题,在分析测试废纸浆在不同浓度下黏度的等流体特性的基础上,通过Unigraphics NX(UG)软件对压力筛内部流场建立模型,运用计算流体动力学软件(ICEM CFD)和FLUENT软件对压力筛内部纸浆悬浮液流场进行数值模拟,得到了压力筛内部筛浆区流场的压力、湍流强度和流速的分布。结果表明:对于常用典型代表性的浆料和结构特征以及运行参数的压力筛,波纹筛板湍流强度最高为306%,而筛孔内湍流强度最高为128%;筛孔进口处最大流速为8.16 m/s,出口处最大流速为3.5 m/s,平均流速约为1.2 m/s;筛框处旋翼头部静压力最大约为1.8×105Pa,旋翼尾部静压力最小约为6.92×104Pa。     

全自动纸浆模塑餐具生产线优化设计

根据工艺路线,分析了全自动纸浆模塑餐具生产线的组成,阐述了设备工作原理。提出对设备成型模具、热压定型装置、传送系统等部件进行优化设计,以提高设备生产效率,降低生产成本。     

Study on TEMPO-Mediated Selective Oxidation of Alkaline Natural Cellulose Pulp and Properties of Its Products

It has been reported that natural cellulose(celluloseⅠ) can not be oxidized by TEMPO - NaOCl -NaBr system, one of TEMPO-mediated selective oxidantsystems, but regenerated cellulose(cellulose Ⅰ)can becompletely selectively oxidized. In the present work,natural cellulose pulp was treated with NaOH solution,which concentration is lower than 20 wt%. The alkalinecelluloses obtained were oxidized by TEMPO - NaOCl -NaBr system and the factors which influence the selectiveoxidation reaction rate have been investigated. Thestructure of the oxidized products has been characterizedby Fourier transform-infrared(FTIR), nuclear magenaticresonace(NMR) and wide angle X-ray diffraction(WAXD) methods, and their adsorption properties forCu2 and Cd2 in aqueous solutions have beenpreliminarily examined. The results show that after thealkaline treatment, the primary hydroxyl at C6 position ofnatural cellulose can be selectively oxidized to carboxylgroup in the reaction medium at pH 10.8, the oxidationrate becomes greater with the NaOH concentration andalkaline treatment time increasing. The alkaline treatmenthas a great effect on the crystal structure of naturalcellulose, but the crystal structure of alkaline cellulosekeeps almost unchanged after oxidation. The adsorptioncapacity is enhanced by introducing carboxyl groups intothe cellulose macromolecular chains.