MBBR+磁混凝工艺在CASS工艺污水处理厂提质扩容中的应用—以郴州某县城污水厂为例

郴州某县城污水厂原采用CASS工艺,出水水质执行《城镇污水处理厂污染物排放标准》(GB18918—2002)中的一级B标准,在不新增厂区用地、仅通过对生化池原位改造的前提下,采用MBBR+磁混凝工艺对其进行提质扩容改造.工程改造完成并稳定运行1年多后,处理水量从1万m3/d提高至2万m3/d,平均出水浓度COD、BOD...     

T400工艺组件在飞剪控制系统中的应用研究

对某钢厂棒材生产线改造过程中,T400工艺组件在飞剪控制系统中的应用进行了介绍。着重分析了T400工艺组件剪切控制标准软件的三闭环控制系统,改造结果表明T400工艺组件在飞剪控制系统中有极高的应用价值。     

水解—好氧—加药沉淀—臭氧组合工艺在毛纺印染废水预处理提标改造中的应用

介绍了"水解—好氧—加药沉淀—臭氧"组合工艺在设计处理规模为2 000 m3/天的毛纺印染废水预处理提标改造中的应用。针对2013年实施的新的排放标准,无锡协新毛纺织有限公司对原有的污水处理站进行升级改造,在原有的物化加药沉淀工艺基础上新增了水解池、接触氧化池和臭氧氧化工艺。工程实例表明,使用该组合工艺后,污水处理站的毛纺印染废水水质达到GB 4287—2012《纺织染整工业水污染物排放标准》的排放要求,完成了提标改造的目标。     

废纸造纸废水处理工程改造

充分利用原有水处理设施,采用三级生物漂带接触氧化工艺对废纸造纸废水处理设施进行改造.结果表明,改造后废水处理系统对COD的去除率达96.4%,出水各项指标均达到<制浆造纸工业水污染物排放标准>(GB3544-2008)中表3水污染物特别排放限值的要求.     

河南省某白酒厂环保设施提标改造工程实例

针对河南省某白酒厂原环保设施运行不能满足污染物排放标准要求,提出提标改造方案,阐述了污水处理工艺和废气排放工艺改造的工艺流程和主要构筑物参数及设计参数。改造方案实施6个月后运行结果表明:COD、总氮、氨氮、颗粒物、SO2、氮氧化物的排放浓度和排放量明显降低。2018年,厂区在线自动监测系统显示:污水排放达到《城镇污水处理厂污染物排放标准》(GB18918-2002)表1中一级A标准,锅炉废气排放满足《锅炉大气污染物排放标准》(GB13271-2014)表3中燃煤锅炉的污染物特别排放限值要求。环境效益和社会效益明显,为同类企业的环保设施提标改造积累了经验。     

亚麻弹力织物的生产

为了顺利生产亚麻弹力织物,在加工弹力纱时,要对捻线机进行改造,重点控制好捻度和氨纶预牵伸倍数等工艺参数.在织造工序通过调整经纱和纬纱的张力,减少了弹力纬纱的断头次数;对边撑进行改造,保证了织物幅宽控制在标准范围内.经测试,纯亚麻纬弹织物的弹性伸长、织缩率均满足设计要求.     

氧化沟工艺处理绵羊皮制革废水

以河北省辛集市试炮营制革工业区污水处理厂改造工程为例 ,通过改造工程及实际运行表明 :该改造工艺的处理效率较高 ,出水水质达到国家《污水综合排放标准》(BG8978- 1996 )二级标准。总结了工程改造、运行实践中的体会     

物化-生化法处理造纸废水

本文在原有废水处理工艺的基础上利用物化-生化法对造纸废水的处理工艺进行改造.结果表明,该处理工艺效果良好,处理后出水SS、COD、BOD等各项指标均优于综合排放一级标准的要求.     

糖化罐搅拌器桨叶改造

针对糖化罐搅拌器搅拌效果不能满足工艺要求的实际情况,提出糖化罐搅拌器的改造方案和改造细节,阐述了改造前后搅拌器功率的计算与校核结果,及搅拌器改造后的工艺.     

湘乡皮革工业园污水厂提质改造及脱氮分析

对A/O-氧化沟生物脱氮工艺的影响因素和处理效果进行了分析,并应用于湘乡皮革工业园污水处理厂提质改造工程实践,提质改造工程主要包括以下几个方面:加强废水预处理,新建调节池,将原氧化沟工艺改为A/O-氧化工艺以及采用污泥高干脱水新技术。通过调试运行,处理后出水水质达到了设计要求,各项水质指标均低于《污水综合排放标准》(GB8978-1996)一级标准。     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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