BIO-DEINKING OF ONP AND ITS EFFLUENT TREATMENT BY WHITE ROT FUNGUS

INTRODUCTIONIt is well known that deinking of secondary fiber can be carried out by chemical or cellulose-degrading enzymes[ 1,2]. However, due to serious pollution produced from chemical deinking and loss of yield affected by cellulosases, new approach for deinking of secondary fiber is expected. White rot fungus is a variety of microorganism that can degrade woody fiber and lignin in natural environment[3,4,5,6], lignin is one of the integrate component in secondary fiber, especially in …     

不同脱墨方式对二次纤维孔隙结构和结晶性能的影响

采用X射线衍射和等温氮吸附法研究了废旧新闻纸(ONP)在不同脱墨方式下孔隙结构和结晶性能的变化,并运用分形理论对纤维的孔隙结构进行了分析.等温氮吸附实验发现,ONP浆经过中性、碱法和酶法脱墨后,其BET比表面积、BJH孔容及BJH平均孔径变化不大.分形分析发现,脱墨前后纤维的分形维数相近,说明三种脱墨方式对纤维的孔隙结构影响较小. X射线衍射实验发现ONP浆经过中性、碱法和酶法脱墨后,结晶度下降,碱法脱墨浆纤维结晶度下降最大,达12.24%,中性脱墨浆下降6.12%,酶法脱墨浆下降最少仅0.77%.研究中还发现,经过脱墨后,纤维的保水值有所增大,其中碱法脱墨浆纤维增加最大,中性脱墨浆次之,酶法脱墨浆最小.     

REDUCING FIBER LOSS IN LABORATORY-AND MILL-SCALE FLOTATION DEINKING USING SURFACTANT SPRAY TECHNOLOGY

INTRODUCTIONDuring the past few years, the use of recycled fiber has increased dramatically due to the shortage of fiber resources and restrictive environmental regulations on paper landfills. Since the successful application of flotation in the paper recycling industry from the minerals industry in 1980s, flotation deinking has become a necessary process for ink removal from wastepaper in many paper recycling mills. The deinking chemistry and the physicochemical interactions among air bub…     

ENZYME-ASSISTED DEINKING AND FIBER MODIFICATION OF MIXED OFFICE WASTE

INTRODUCTIONIn the past 20 years, more and more waste papers were recycled because of the shortage of raw materials and increasing pressure of environment protection. Among those recycled waste paper, MOW, which contains xerographic and laser printed pape…     

ENZYMATIC DEINKING AGENTS FOR MIXED OFFICE WASTEPAPER

With the development of papermaking industry, pollution and energy shortage have been receiving more and more concerns recently. Because raw material for papermaking are becoming scarcer and scarcer around all over the world, secondary fiber has become one of the absolutely necessary materials. As a new sort of reclaiming wastepaper, MOW (mixed office wastepaper) has received much concern in recent years. [1-4] But because of the peculiarities of toners used in electrostatic printed paper and…     

旧报纸的酸性生物酶法脱墨

研究了一种新的废纸脱墨工艺，它是用酸性纤维素酶处理旧报纸浆，然后在酸性条件下进行浮选脱墨，此工艺化学药品用量少，有利于环境保护；所得脱墨浆白度高，黄度低；具有较好的滤水性能和相近的强度性能。利用过氧化氢进行漂白时，酶法脱墨浆的可漂性优于化学法脱墨浆。     

纤维素酶在废纸脱墨中的应用

采用纤维素酶对废书刊纸进行了脱墨探索,实验结果表明,酶法脱墨较佳的工艺条件为pH 5～6、浆料浓度5.5%、酶用量0.1%～0.15%、处理时间40min～50min、处理温度50℃～60℃。同时,酶法脱墨还能改善浆料的物理强度,提高其可漂白性。     

STUDY ON NEUTRAL DEINKING OF ONP WITH NON-IONIC SURFACTANTS

INTRODUCTIONNeutral deinking is a new deinking technology proposed in recent years. It mainly adopts floatation/washing process in waste recycling. Neutral deinking basically conquers the shortcomings existed in conventional alkaline chemical deinking. Due to its deinking without alkali and other additional agents, it can save deinking costs, reduce environmental pollution and enhance deinking efficiency [1-8].Surfactants are indispensable component in deinking agents. Cationic surfactan…     

FLOTATION DEINKING AGENTS FOR ONP RECLAIMING

Wastepaper reclaiming has received more and more concerns in recent years, and the related science and technology are becoming one of the most research hotspots in China. As an old kind of reclaimed wastepaper, ONP (old newsprint) has many advantages, for example, inks are easy to be separated and removed. Washing deinking, which demands much water consumed, is the main method for ONP reclaiming. But in China many paper mills are affected by lack of water, so they have to select flotation d…     

混凝—化学氧化法处理脱墨废水

对脱墨废水进行了混凝—化学氧化法处理,结果表明:脱墨废水经过混凝—化学氧化法处理后,其污染负荷SS、CODcr达到国家GWPB2—1999所规定的排放要求。处理后的废水可循环回用。     

废办公用纸超声波脱墨时间的研究

本文对不同浓度纸浆在不同的超声波脱墨时间下进行脱墨.同时采用浮选法脱墨,比较所得再生纸的关键性特性白度、色度等.研究结果发现:纸浆浓度5%,超声波脱墨时间4 0min时再生纸白度最好;纸浆浓度5%,超声波脱墨时间20min时黄色色度最低.相同的脱墨条件下,得纸率按浓度的递增而呈上升趋势.     

ENZYMATIC DEINKING OF NONIMPACT PRINTED WASTES

INTRODUCTIONNonimpact printed wastes include laser printed and xerographic papers. These wastes are increasing with the increasing utilization of computer printout and photocopiers. It is difficult for us to deink these wastes. The pigments in these inks are carbon black mixed with thermo-plastic resin binders,for example, styrene-acrylate copolymers that will crosslink at 100℃during fusing stage of the copying process①. These hard cross linked, stringly bound systems will only be fragm…     

脱墨废水的混凝——活性污泥的处理

对脱墨废水采用混凝—活性污泥处理效果进行了研究,结果表明：脱墨废水经过混凝处理,可使BOD5、CODcr和SS的去除率达到64.44%、72.21%和73.93%,混凝后的脱墨废水再经活性污泥处理,其BOD5和 CODcr的去除率达到89%和60%。处理后的废水可循环回用并完全达到国家GWPB2—1999所规定的排放要求。     

基于环境温度角度DASB预处理脱墨废水的分析

DASB又称降流式氧污泥反应器,是一种新型的厌氧处理技术,有很强的阻止和截留的能力,并且处理泥水的效果好,运行的管理比较方便,而在性能的方面也有很多的优点.那么用降流式氧污泥反应器来处理造纸过程中所产生的脱墨废水有很大的效果,经过研究DASB能有效的影响水解酸化.在许多实验中都证明出,降流式氧污泥反应器受着PH值和容积负荷的影响,如果PH的值为7.0至7.2,HRT值为22.4,容积的负荷是2.15kg/(m3.d)的时候,那么在在这样的条件下运行的效果是最好的,如果能在最好的效果下运行,在进水BOD的值为0.37时,那么出水DOB的值就可以提高到0.6,在这种情况下脱墨废水的可生化性质就能很有效的提高.     

ENZYMATIC DEINKING OF OLD NEWSPRINT WITH CELLULASES AND XYLANASE

The enzymatic deinking and fiber modification of old newsprint (ONP) with several cellulases and xylanase were investigated and the suitable enzyme candidates were selected for ONP deinking in this paper. The results demonstrated that the cellulases and hemicellulases could significantly improve the deinking efficiency and fiber modification.Moreover, the synergistic effects of Novozym342 and xylanase (HC) can further enhance the deinking performance, reduce the dirt count and improve the brightness of resulting pulp. Additionally, compared to deinked pulps, obtained from conventional chemical materials, enzymatically deinked pulps had better bleachability, and the brightness of the bleached pulp reached 59.1% ISO, 9% ISO higher than the unbleached pulp.     

生物酶在废纸脱墨上的应用

简要介绍了用于废纸脱墨的生物酶以及生物酶在各种废纸脱墨上的应用，展望了生物酶废纸脱墨技术应用的发展前景。     

废纸脱墨热分散系统垢物化学成分及成因分析

废纸脱墨产新闻纸系统中热分散的结垢会较大地影响设备生产效率、能耗和产品质量,为了对热分散系统的垢物进行有效控制,对热分散系统垢物进行采样,用热解气质联用色谱(Py-GC/MS)、红外光谱(IR)、离子色谱(IC)、X射线衍射(XRD)等方法研究垢物的化学成分,并分析了有机垢、无机垢的形成原因。研究表明:脱墨线垢物以钙垢和硅垢等无机垢为主,其中SiO2质量分数为35.2%,CaSiO3质量分数为21.2%,CaCO3质量分数为11.2%;热分散盘齿有机胶黏垢来源于废纸原料,或由系统白水回用将施胶部胶黏物带入。加强废纸原料的筛选与洗涤是控制垢物生成的根本,此外,在不影响成纸质量的情况下尽量减少化学品的添加量。     

废纸脱墨工艺中泡花碱的应用研究

研究了废纸脱墨工艺中泡花碱的使用方法，提出了以Ｎａ２Ｏ％含量为标准计量泡花碱的最佳用量。     

ONP脱墨浆二氧化硫脲漂白研究

实验主要探讨了ONP脱墨浆FAS单段漂白的工艺条件,找出了FAS漂白的最佳工艺条件为:FAS用量0.6%,NaOH用量0.3%,漂白温度65℃,漂白时间30min,浆浓10%,在此条件下漂后浆白度达66.6%ISO。     

HIGH CONSISTENCY PULPING OF OLD NEWSPRINT AND ITS FLOTATION PROPERTIES

INTRODUTIONWaste paper is an important recyclable resource. The problems that are concerned with resource, energy and environment can be solved effectively by recycling of the waste paper. In the past decade, countries all over the world have paid great attention to the recycling of waste paper, so its recycling ratio has been increasing year and year. The technologies for waste paper recycling have also been developed and modified. The production and varieties of paper and paperboard mad…