废纸浆造纸废水处理工程实践

针对造纸废水中CODCr,SS等浓度较高的特征，以某年产5万t包装纸厂为例，采用水解酸化-CASS-气浮联合工艺处理某废纸纸浆造瓦楞纸项目废水，一年多的运行结果表明：整个废水处理系统的CODCr去除率大于97％，出水中CODCr，BOD5和SS质量浓度分别为60-80mg／L，10-20mg／L和60-80mg／L。整个废水系统投资和运行费用低，投资规模在0.05-0．06万元／（m^3·d），运行费用≤0．6元／m^3。     

衡阳市蔬菜品种及产业发展研究报告

为了及时掌握衡阳市蔬菜产业发展动态,有效的指导衡阳市蔬菜生产,笔者对2006年衡阳市蔬菜品种及产业发展情况进行了调查,主要是摸清蔬菜品种,找出存在的主要问题,提出了下一步蔬菜品种及产业发展措施,把衡阳市蔬菜生产推向一个新的发展水平．表10,参7．     

利用造纸污泥制备两性木质素絮凝剂的研究

从造纸污泥中回收木质素,经磺化制得木质素磺酸盐,再与用三乙胺和环氧氯丙烷反应制得的季铵盐单体接枝共聚合成出两性木质素絮凝剂.探讨了催化剂、活化时间、反应物投料比、接枝温度和时间等因素对产品脱色性能的影响.将产品用于多种模拟染料溶液的脱色处理中,结果表明,该法制备的两性木质索絮凝剂对多种染料具有良好的脱色效果,脱色率均达...     

Ink and dirt behavior in pulping after artificial aging of cold-set offset printed newspapers in different humidity conditions

Although moisture has a decisive role in the permanence of cellulose and unprinted paper, its role in ink release from the surface of printed recovered papers remains unclear. This work aimed to determine whether various relative humidity levels in the artificial aging test affect ink release from the surface of the paper and its fibers when pulping cold-set offset printed newspapers in alkaline pulping conditions. The results showed that relative humidity variations from 30% to 70% negligibly affected ink release at 60 °C. However, compared with these lower humidity levels, exposure to 90% relative humidity for at least 25 h resulted in a higher ink content bound to fibers, a greater formation of visible dirt specks after pulping and a smaller formation of microscopic ink particles. In practical applications, the accurate estimation of climate effects during the storage and the transportation of recycled papers requires that humidity conditions are taken into account while performing artificial aging tests with paper products.     

The effect of environmental regulation on plant-level product mix: A study of EPA's Cluster Rule

This paper examines the effect of the U.S. Environmental Protection Agency's Cluster Rule on the product-mix decisions of plants in the pulp, paper, and paperboard industries. The Cluster Rule combines regulatory requirements from the Clean Air Act and Clean Water Act that are based on plants altering their production processes away from chlorine-based bleaching agents. In addition to, or instead of, altering production processes, plants may plausibly comply with the regulation by reducing output of bleached products or dropping some of these products entirely. Using a difference-in-difference-in-differences approach, we find evidence that plants facing both air and water Cluster Rule regulation (treatment group) are more likely to drop bleached products relative to unbleached products compared to plants facing only air Cluster Rule regulation (control group). Furthermore, we find evidence that plants in the control group alter their product mixes toward bleached products.     

造纸污泥硫化氢释放量及控制研究

研究TCuSO_4、NaClO、KMnO_4、H_2O_2处理液及其浓度对造纸污泥硫化氢释放量的影响.结果表明.随各处理液浓度增大,硫化氢释放量有不同程度的减少;各种处理液均能明显降低造纸污泥硫化氢释放量,效果从好到差依次为CuSO_4、NaClO、KMnO_4、H_2O_2;CuSO_4的除臭机制是铜离子抑制细菌生长,同时与硫化氢反应生成不溶的CuS;而NaClO、KMnO_4、H_2O_2除臭机制是抑制细菌生长和氧化硫化氢产生单质硫;干污泥硫化氢释放量比湿污泥大.     

废纸制浆造纸废水封闭循环处理工艺

本文介绍了废纸造纸制浆废水的特点、在零排放和废水封闭循环中遇到的问题以及解决措施，介绍了几种目前比较常用的废纸制浆连纸循环水处理工艺及其发展状况。     

纸浆造纸废水与城市污水厂进水混合处理的试验研究

采用SBR工艺模拟污水厂活性污泥法处理纸浆造纸废水。试验结果表明,活性污泥法处理纸浆造纸废水效果良好,对NH3-N、TP、SS、COD以及BOD5的去除率分别达到99%,88%,99%,93%,97%。证明纸浆造纸废水与城市污水混合处理是可行的。     

Rapid field testing of mercury pollution by designed fluorescent biosensor and its cells-alginate hydrogel-based paper assay

With increasing industrial activities, mercury has been largely discharged into environment and caused serious environmental problems. The growing level of mercury pollution has become a huge threat to human health due to its significant biotoxicity. Therefore, the simple and fast means for on-site monitoring discharged mercury pollution are highly necessary to protect human beings from its pernicious effects in time. Herein, a “turn off” fluorescent biosensor (mCherry L199C) for sensing Hg²⁺ was successfully designed based on direct modification of the chromophore environment of fluorescent protein mCherry. For rapid screening and characterization, the designed variant of mCherry (mCherry L199C) was directly expressed on outer-membrane of  Escherichia coli cells by cell surface display technique. The fluorescent biosensor was characterized to have favorable response to Hg²⁺ at micromole level among other metal ions and over a broad pH range. Further, the cells of the fluorescent biosensor were encapsulated in alginate hydrogel to develop the cells-alginate hydrogel-based paper. The cells-alginate hydrogel-based paper could detect mercury pollution in 5 min with simple operation process and inexpensive equipment, and it could keep fluorescence and activity stable at 4?°C for 24 hr, which would be a high-throughput screening tool in preliminarily reporting the presence of mercury pollution in natural setting.     

Local authority waste paper recovery operations: An appropriate costing system

This article reviews attempts by other workers to derive full economic evaluations of local authority waste paper recovery operations and proposals from government bodies to devise uniform costing systems for these schemes. In the light of this work a standard costing system for local authority waste paper recovery operations is proposed. Empirical data was obtained from a number of local authorities and analysed using this standard costing system. The viability of each scheme under the standard costing system and the Council's original costing system is compared.