泥浆对造纸废水的混凝沉降作用     

胡云楚  陈茜文  孙汉洲  傅武俊 《中南林业科技大学学报(自然科学版)》2002,22(2):74-76

以泥浆为吸附主剂、明矾为混凝剂 ,通过混凝沉降试验探索消除造纸工业废水中的污染物的途径和方法 .研究表明 ,每5 0 0 m L造纸废水加入 3 0 m L 红土泥浆 ,充分搅拌 ,静置 2 h后 ,移出 45 0 m L上层液 ,再加入 4m L明矾饱和溶液 ,充分搅拌 ,静置 2 h后 ,水体 p H值为 6左右、SS低于 14 0 mg·L- 1、CODCr低于 80 mg· L- 1、浊度低于 2 ,均可达到第二类污染物最高允许排放浓度标准 .  相似文献   

15000t/d造纸废水处理工程的工业运行   总被引：1，自引：1，他引：1  

施英乔  丁来保  李萍  房桂干 《林产化学与工业》2001,21(2):34-38

在一个现代化的大型造纸厂,监测了进口新纸机排放废水的污染特征,培养驯化出净化效果良好的活性污泥菌,调试优化了日处理15 000 t造纸废水工程的运行参数,使每天的排放水COD＜100 mg/L、SS＜100 mg/L、pH6～9，提前达到了我国政府将于2001年实施的造纸废水排放新标准GWPB2-1999。  相似文献   

日本落叶松中龄林施肥效应研究     

祁万宜  孙晓梅  张守攻  王军辉  应中华  李道新 《湖北林业科技》2007,(4):12-17

根据在鄂西大老岭林场进行的日本落叶松中龄林4种施肥量、3种N与P配比、2种施肥次数的3a试验效应研究,结果表明:不同施肥量、不同N、P比、不同施肥次数对日本落叶松中龄林生长影响不显著;但14a生B1材积生长比其它平均材积提高28.4%。施肥组合8(A1B1C1)各年生长量均高于其它组合的生长量,其材积比其它平均材积提高32.8%。  相似文献   

科技论文学术价值评价方法的探讨     

邱德勇 《中南林业科技大学学报(自然科学版)》2004,24(6):116-119

探讨了科技论文学术质量评价方法和机制.列出了4大类评价方法,包括12种具体评价方法.按评价时间先后分类,把评价方法分为早期评价、中期评价和后期评价.  相似文献   

Rootstock effects in grafted conifers: A review     

K. J. S. Jayawickrama  J. B. Jett  S. E. McKeand 《New Forests》1991,5(2):157-173

The literature on rootstock effects (on scions) in conifers was reviewed, specifically: graft success, compatibility, size, reproduction, phenology, crown and needle characters, mineral contents, organic compounds, water relations, disease resistance and wood properties. Scions usually had higher graft success and less incompatibility on more closely related rootstocks although there were exceptions. Even intergeneric grafts have succeeded on occasion. Although there were marked rootstock effects on growth and reproduction, the effects did not follow a pattern with increasing relationship. It is also likely that some crown characters and the nutrient content of scions can be manipulated by the use of rootstocks. For many characters, a specific rootstock may give a desired result only for a limited number of scion types (species, cultivars or clones). With some exceptions, the review shows that the subject has not been comprehensively studied. Many of the studies were either short-term, inadequately replicated, or poorly designed to allow firm conclusions about rootstock effects. The physiological and biochemical mechanisms, which cause the changes seen in morphology, are not well understood. Further research and more comprehensive study of rootstock effects on scion biology are recommended.  相似文献   

中国造纸工业现状和林纸一体化   总被引：1，自引：0，他引：1  

袁晖 《四川林勘设计》2003,(2):12-17

现代造纸工业是建立在现代林业基础之上的，木材造纸是造纸工业发展壮大的必由之路。走林纸一体化道路是解决中国造纸工业原料结构问题，实现造纸工业现代化的根本途径。文章在分析中国造纸工业现状的基础之上，对林纸一体化的历史、基本概念、必要性、相关建议等方面作出了有益探讨。  相似文献   

模糊控制在纸浆模塑包装容器生产环节中的实现     

孙丽萍  王克奇  赵丽花  邱仁辉 《林业科技》2003,28(5):46-48

纸浆模塑生产过程是一个典型的多变量、强耦舍、多干扰、时变复杂的系统。根据其控制过程中被控对象复杂而难以控制的特点。采用模糊控制策略构建了纸浆模塑包装容器生产环节中的软、硬件系统。  相似文献   

某大型造纸厂高效污水处理工程设计与运行     

刘明元  罗鑫  陈歆  申晓霞  周建飞 《绿色科技》2020,(6):147-149

指出了随着当前造纸领域中水循环利用率不断提高,废水处理难度大、成本高及污泥处理困难,某大型造纸厂污水处理站仅采用预处理+EGSB+A/O的工艺方案处理该厂生产废水。经处理后出水CODcr、色度、BOD5、氨氮、总氮及总磷等指标均达到《制浆造纸工业水污染物排放标准》(GB3544-2008)表2规定的新建企业水污染物排放限值要求,同时达到表3水污染物特别排放限值的要求,水处理成本仅为127元/t,污泥处置方便,且有一定经济效益,对于我国造纸污水的处理具有较高的应用推广价值。  相似文献   

Cost minimization through the use of taungya system in pulpwood plantation establishment     

Francis O. C. Nwonwu 《Agroforestry Systems》1987,5(4):455-462

The costs and benefits of the use of three labour alternatives: direct permanent, direct casual and taungya labour in Gmelina arborea pulpwood plantation establishment in Nigeria were investigated. Results show that cost per hectare is lowest with taungya labour and highest with permanent labour with savings in cost of as much as 30% and 47% by taungya labour over casual and permanent labour respectively. The net present value per hectare of investment is highest when taungya labour is used and lowest and negative with permanent labour. Also, the internal rate of return of investment is highest with taungya labour and lowest with permanent labour. The net present values and internal rates of return for Gmelina plantations calculated for the three pulp and paper mills in Nigeria show the same trend in favour of taungya labour.  相似文献   

切纸圆刀专用磨床及配套夹具的研制     

朱圣华  卢美鸿  沈永军 《林业机械与木工设备》2015,(5)

对造纸行业切纸用的各种小型圆刀结构及研磨设备进行系统研究,研制出专用磨床,并对其传动原理、基本结构、安装调试、配套夹具设计等进行了介绍。  相似文献