ECF漂白废水回用对产污负荷的影响研究

将麦草浆ECF漂白(DQP)中的P段洗涤废水用于D段漂后浆料的洗涤,初步探讨P段洗涤废水回用对漂白废水污染负荷及浆料性能的影响。结果表明,P段洗涤废水回用后,漂后浆料白度升高1~2个百分点,黏度略有下降;不同漂剂用量下,漂白废水COD Cr下降0~2.5 kg/t漂白浆,BOD5下降2.1~2.9 kg/t漂白浆,AOX下降17%~20%,漂白废水产生量减少30%。     

ECF漂白废水回用对产污负荷的影响研究

将麦草浆ECF漂白（DQP）中的P段洗涤废水用于D段漂后浆料的洗涤,初步探讨P段洗涤废水回用对漂白废水污染负荷及浆料性能的影响。结果表明,P段洗涤废水回用后,漂后浆料白度升高1~2个百分点,黏度略有下降;不同漂剂用量下,漂白废水CODCr下降0~2.5 kg/t漂白浆,BOD5下降2.1~2.9 kg/t漂白浆,AOX下降17%~20%,漂白废水产生量减少30%。     

蔗渣浆ECF和TCF漂白流程的比较

本论文主要是以传统CEH漂白为参考基准,对蔗渣浆的无元素氯漂白(ECF)流程DQP和全无氯漂白(TCF)流程OQP进行比较,包括漂后纸浆的性质(粘度、返黄值以及裂断长、撕裂指数、耐破指数)和漂白废水的污染负荷(CODcr,BODs,SS和AOX),结果发现OQP和DQP漂后纸浆都具有较高的强度性能、较好的白度稳定性,而且废水具有较低的污染负荷.     

洗浆对纸浆漂白及其废水污染负荷的影响

来自蒸煮工段的粗浆,含有大量的蒸煮废液,必须经过洗涤等工段的处理,以获得符合要求的浆料,并对废液加以回收利用.洗浆和纸浆产品质量、环保、节能、降耗都密切相关.本文以NaOH-AQ法麦草浆为研究对象,对浆料进行梯度洗涤,得到三种浆料.将三种浆料按照相同条件分别进行CEH,DQP和D(EOP)D漂白,研究了洗浆对漂白效果和废水污染负荷(BOD5、CODCr、SS和A0X)的影响.     

落叶松KP浆ClO2漂白及其废水负荷和特性

用二次旋转组合设计等方法对落叶松硫酸盐浆D50/C50E1D1E2D2和DE1D1E2D2的漂白程序进行了优化,探讨了ClO2对落叶松硫酸盐浆的漂白性能,漂白废水的特性及污染负荷.结果表明纸浆白度高(80%SBD以上),污染负荷低.     

落叶松KP浆C102漂白及其废水负荷和特性

用二次旋转组合设计等方法对落叶松硫酸盐浆D50／C50 E1D1E2D2和DE1D1E2D2的漂白程序进行了优化,探讨了CIO2对落叶松硫酸盐浆的漂白性能,漂白废水的特性及污染负荷。结果表明：纸浆白度高(80％SBD以上),污染负荷低。     

非木浆OQP漂白及其与CEH漂白的比较

进行了芦苇、麦草和蔗渣烧碱-蒽醌法纸浆OQP漂白的研究，并与常规的CEH漂白结果作了比较。研究结果表明，3种非木材纸浆经OQP和CEH流程漂白，白度均可达到80％ISO以上。与CEH漂白浆相比，OQP漂白浆的白度略低，但白度稳定性较好，粘度和强度较高，而且0段废液可送至碱回收系统进行回收，QP漂白废水的污染负荷比CEH漂白废水的污染负荷低得多。     

天然介体与合成介体对蔗渣浆LQP漂白影响的研究

本实验以烧碱-蒽醌法蔗渣浆为原料,选用3种漆酶漂白的天然介体和1种合成介体,对蔗渣浆进行LQP三段处理,以此来考察不同介体及用量对处理后纸浆白度、强度及漂后废水COD污染负荷的影响。经过研究可知,纸浆经LQP三段处理,其白度明显得到改善,且纸浆不易返黄;纸页的抗张指数、耐破指数、撕裂指数均有不同程度的改善;添加天然介体的P段废水CODCr值明显低于合成介体HBT的废水CODCr值,且低于未添加介体的空白试验废水CODCr值。因此,天然介体比合成介体在改善纸浆性能、降低漂白废水污染方面更具优势。     

没有废水的漂白硫酸盐纸浆厂

在没有废水的浆厂里,蒸煮和漂白需用的水和化学品全部得到回收和回用。通过漂白工段和粗浆洗涤器,纸浆以逆流方式进行洗涤。漂白工段的废水通过黑液蒸发器进入燃烧炉。利用水蒸汽或空气的汽提,除去冷凝水中有恶臭的硫化物;干净的冷凝水用于最后的漂白浆洗涤器。 氯化所需氯的大部分被相当量的ClO_2     

NaOH-AO麦草浆ECF漂白的研究

以NaOH-AQ麦草浆为研究对象,进行无元素氯的D(EOP)D漂白研究.在总有效氯用量为40kg/t浆的情况下,纸浆漂至81%ISO以上的白度.与传统的CEH漂白浆相比D(EOP)D纸浆的粘度和强度高,打浆能耗低,而且漂白废水的污染负荷(CODCr、BOD5和AOX)低.     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press