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白腐菌降解焦化废水的研究 总被引:1,自引:0,他引:1
介绍了白腐菌在焦化废水中的驯化生长和产酶条件优化,考察了白腐菌及其酶类对焦化废水的降解能力,结果表明:白腐菌在培养条件下能够产生白腐菌漆酶,是降解焦化废水中的多环芳香化合物的主要活性成分。经过白腐菌和活性污泥混合,得到较好的处理效果:实验时间内COD去除率达到89%,NH3-N达到88%,较单纯活性污泥效率高。 相似文献
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固定化白腐菌处理苇浆氯漂碱抽提段废水的研究──不同因素对脱色效果的影响 总被引:1,自引:0,他引:1
比较了几株不同白腐菌经固定化后处理E段氯漂废水的脱色效果。发现白腐菌Polystictusversicolor和Phlebiaradiata的脱色效果最好,废水色度在24h内可有效降低达50%。在处理废水过程中,不同的白腐菌对介质pH值的适应性有所不同。附加碳原和氛语的添加与否,对固定化白腐菌处理废水的脱色效果影响不大。 相似文献
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固定化白腐菌处理苇浆氯漂碱抽提段废水的研究:不同因素对脱 … 总被引:2,自引:0,他引:2
比较了几株不同白腐菌经固定化后处理E段氯漂废水的脱色效果。发现白腐菌Polystictusversicolor和Phlebia radiata的脱色效果最好,废水色度在24h内可有效降低达50%在处理废水过程中,不同的白腐菌对介质P珠适应笥有所不同附加碳源和氮源的添加与否,对固定化白腐菌处理废水的脱色效果影响不大。 相似文献
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四株产酸白腐菌应用于碱性造纸黑液生物治理的研究 总被引:7,自引:1,他引:7
研究了4株产酸白腐菌在碱性黑液体系中pH值、固体量、酸析与酸溶木质素、COD的变化状况。结果表明碱性对产酸白腐菌具有抑制作用。S4B、S6B及S5B(pH=9)不能适应碱性环境,S1B和S5B(pH=8)能够适应一定的碱性环境,同时改变体系pH值、木质素和COD。S1B可将环境酸碱度从初始的pH=8、pH=9下降到pH=1,即通过产酸与生产降解,去除体系中木质素,COD去除率达73%。说明产酸白腐菌在碱性黑液中可以发挥产酸与降解的双重功能,可应用于黑液的生物处理。 相似文献
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白腐菌Cyathus stercoreus预处理芦苇制浆的研究 总被引:3,自引:0,他引:3
对用白腐菌Cyathus stercoreus预处理芦苇制取化学浆进行了研究。实验结果表明,用Cyathus stercoreus固体发酵处理后的芦苇所制烧碱—蒽醌浆的白度和粘度要低于未经发酵处理的对比浆的白度和粘度,而Kappa值高于对比浆;这个结果表明,白腐菌Cyathus stercoreus 对芦苇中的纤维素,半纤维素和木质素均有不同程度的降解能力,且对纤维素和半纤维素的降解要高于对木素的降解。且在白腐菌Cyathus stercoreus预处理过程中所分泌的各种木素降解酶的作用下,芦苇木素既发生降解,也发生一定程度的聚合。 相似文献
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以接种量1%、接种龄7天为基准,在天然培养基及室温条件下,探讨了三种白腐菌对稻草秸秆中木质纤维素的降解动力学特性。结果表明,对木质素的降解速率桦褐孔(Inonotus sp)最高,红平菇(Pleurotus djamor)次之,白韧(Trametes sp)最低;对纤维素的降解速率与此正好相反。三菌株对木质纤维素的降解呈现一定的选择性,其中桦褐孔(Inonotus sp)对木质素的选择性降解优势最明显,选择系数达到2.99。 相似文献
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经水热预水解技术处理木质纤维素,木片的主要成分发生变化,对后续的化学制浆性能及制浆黑液性质带来影响。本实验采用不同预水解强度(P因子)处理相思木片,并对其硫酸盐制浆行为和黑液性质进行分析。研究结果表明,随着P因子的增大,粗浆得率和细浆得率逐渐降低;浆料的卡伯值逐渐升高。当P因子<200时,水解后木片的黑液固形物含量由空白组的138.48 g/L升高到162.86 g/L;木素含量由58.57 g/L升高到72.68 g/L;残碱量由4.37 g/L迅速降低到2.07 g/L。当200<P因子<600时,黑液固形物含量由162.86 g/L降低到142.71 g/L;黑液中木素含量由72.41 g/L降低到59.16 g/L;残碱量由2.07 g/L降低到1.26 g/L。当P因子>600时,黑液中固形物含量由142.71 g/L升高到156.95 g/L;木素含量由59.16 g/L升高到62.16 g/L;残碱量由1.26 g/L升高到1.37 g/L。不同条件下,黑液中无机物含量变化不大;黑液固形物的热值由对照组的13.71 MJ/kg提高到14.63~15.09 MJ/kg。 相似文献
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J I Botello M A Gilarranz F Rodríguez M Oliet 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1999,74(2):141-148
The aim of the present work was to study the fractionation of Eucalyptus globulus wood into pulp and by‐products by alcohol–water pulping. Under the cooking conditions employed low lignin content pulp and a high yield of by‐products were attained. The laboratory‐scale alcohol and by‐products recovery system studied consisted of three stages: black liquor flashing, lignin precipitation from black liquor, and distillation of precipitation mother liquor. The mass balance for the process enabled the amount of pulp and by‐products produced and the consumption of chemicals to be estimated. © 1999 Society of Chemical Industry 相似文献
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Abstract Black liquor, isolated dissolved lignin and residual lignin samples corresponding to different cooking times were obtained from flow-through kraft cooking of birch wood. Dissolved lignin was isolated from black liquor by acid precipitation and residual lignin was isolated from pulp by acid-dioxane extraction. The average mobility (μav) of the lignin-containing samples was determined by capillary zone electrophoresis. The lignin samples have a broad mobility distribution that reflects the charge-to-size ratio of the molecules. At pH 12, i.e. when lignin is completely dissociated, the μav of each type of sample increases during the cook, reflecting an increase in charge density of the lignin. For samples corresponding to the initial and beginning of the bulk delignification phases, the μav decreases in the order dissolved lignin>black liquor>residual lignin. The lower charge density of black liquor compared to dissolved lignin is proposed to be caused by associations between lignin and carbohydrate fragments dissolved in the black liquor. As from the middle of the bulk delignification phase, the μav of the three series of samples is quite similar. The decrease in mobility on lowering the pH is an indication of the degree of dissociation of the lignin phenol groups. At pH 10, i.e. about the pKa of lignin, the μav of black liquor is highest throughout the cook. The relative order of μav is then black liquor>dissolved lignin≈residual lignin. 相似文献