Comprehensive utilization of residues of Magnolia officinalis based on fiber characteristics

Journal of Material Cycles and Waste Management - The traditional Chinese medicinal plant Magnolia officinalis has a wide range of applications; including more than 200 kinds of patented Chinese...     

滦河锡林郭勒盟段水质状况评价

利用水质指数法对滦河锡林郭勒盟段水质状况进行了分析评价,结果显示：（1）滦河锡林郭勒段2005-2007年主要污染因子为：高锰酸盐指数、化学需氧量、铁、生物需氧量、锰、总磷等;（2）2005-2007年间,上都河监测断面水质状况整体呈变好趋势,但地方经济增长带来的化学需氧量异常升高不容忽视,大河口断面不同水期水质状况变化不同;（3）2005-2007年,滦河锡林郭勒段化学需氧量与溶解氧超标污染加重明显、高锰酸盐指数超标污染逐渐减轻;三年内,上游水质均优于下游水质,两个监测断面水质均为丰水期水质〈平水期水质〈枯水期水质。     

15N示踪法研究固氮芽孢杆菌应用效果

通过对水稻盆栽试验,应用15N示踪测试技术和土壤农业化学分析方法,研究接种不同剂量固氮芽孢菌对当季水稻的供氮能力,结果表明:在施有机肥的基础上,接种固氮芽孢杆菌能为当季水稻提供氮素,而且,接菌剂量在0.60亿个?pot-1以内,其供氮能力随着接菌剂量的增加而提高;接种剂量从0.15亿个?pot-1增加到0.60亿个?pot-1,其对当季初的氮素供应从88.7mg?pot-1提高至109.7mg?pot-1,并减少水稻对肥料氮和土壤氮的吸收,增加茬后土壤的速效氮积累,接种量以0.15亿个?pot-1～0.30亿个?pot-1较经济。但在一定的施肥基础上,接种固氮菌对水稻的产生量和吸收氮素总量影响不明显。     

露天开采对周边地面的影响特点与破坏区划分方法的研究

露天开挖将引周围岩体的变形，随着采深和坡角的增大，其影响范围和影响程度都将增大。在我国有许多老矿区周边是密集城市群，开挖引起的变形对周边各种建筑设施和工厂的安全产生严重的影响。本文主要研究和探讨露天开采对地面建筑设施的影响特点，并就变形可能产生破坏程度进行分析，从而给出一般变形区、危险区和破坏区的划分原则和划分方法，以便为治理措施提供科学依据。     

论锡林郭勒盟2006～2010年沙尘暴发生情况及原因分析

沙尘天气是一种灾害性天气,它不仅对于气候和生态系统产生重要影响,而且对工农业生产,交通、建筑设施、人民生命财产等造成严重危害,可谓是现今最重大的气象和环境灾害之一。锡林郭勒盟是遭受沙尘危害的重灾区,通过对2006-2010年期间的沙尘天气的发生情况的研究,总结沙尘天气产生的原因及相应对策。     

锡林郭勒盟城镇饮用水水源地现状及保护对策

饮用水源地保护是一项非常重要的工作,直接关系到饮用水水质的安全和人民群众的身体健康。从保护锡林郭勒盟饮用水水源地环境的角度出发,对锡林郭勒盟12个旗县市的13个集中式城镇饮用水水源地环境现状进行了调查研究,在全面分析锡林郭勒盟城镇饮用水水源地环境现状及存在问题的基础上,提出了保护锡林郭勒盟饮用水水源地的设想和办法.对推动锡林郭勒盟饮用水水源地环境保护工作进程,改善饮用水源地环境质量提供有力措施。     

Fenton试剂氧化对硝基酚中氧化还原电位的变化规律

考察了Fenton试剂氧化对硝基苯酚(PNP)过程中氧化还原电位(ORP)的变化规律.结果表明:(1)当pH为3、H2O2投加量为3 mmol/L、Fe2+投加量为0.3 mmol/L时,废水中PNP在5.0 min时降到5 mg/L左右,去除率达95%;废水可生化性得到有效改善(BOD5/COD由最初的0.073升至...     

Analysis of air quality characteristics of Beijing–Tianjin–Hebei and its surrounding air pollution transport channel cities in China

Beijing–Tianjin–Hebei(BTH) and its surrounding areas are very important to air pollution control in China.To analyze the characteristics of BTH and its surrounding areas of China,we collected 5,641,440 air quality data from 161 air monitoring stations and 37,123,000 continuous monitoring data from air polluting enterprises in BTH and surrounding cities to establish an indicator system for urban air quality portraits.The results showed that particulate matter with aerodynamic diameters of 2.5 μm(PM_(2.5)),particulate matter with aerodynamic diameters of 10 μm(PM_(10)) and SO_2 improved significantly in 31 cities from2015 to 2018,but ozone deteriorated.Air quality in BTH and the surrounding areas showed obvious seasonal characteristics,among which PM_(2.5),PM_(10),SO_2,and NO_2 showed a "U" type distribution from January to December,while O_3 had an "inverted U" distribution.The hourly changes in air quality revealed that peaks of PM_(2.5),PM_(10) and NO_2 appeared from 8:00 to 10:00,while those for O_3 appeared at 15:00–16:00.The exposure characteristics of the 31 cities showed that six districts in Beijing had the highest air quality population exposure,and that exposure levels in Zhengzhou,Puyang,Anyang,Jincheng were higher than the average of the 31 investigated cities.Additionally,multiple linear regression revealed a negative correlation between meteorological factors(especially wind and precipitation) and air quality,while a positive correlation existed between industrial pollution emissions and air quality in most of BTH and its surrounding cities.     

生态型抑尘剂的选择与实验模拟研究

根据露天矿汽车运输土质路面扬尘的发生机理,从环境本底条件出发,建立了粘结、凝并、吸湿、保水等抑尘因子的选择原则,确定了抑尘因子并对其进行了粘度、吸湿、高温抗蒸发及研磨抗辗压等实验模拟,在露天矿主要运输道路和放矿平台进行了应用.结果表明,由可溶性淀粉、硅酸钠和丙三醇组成的抑尘剂,粘度可达5 10mPa·s,粉尘的饱和吸剂率达到64 6% ,恒高温(4 5℃)下单位面积的蒸发速率为0 3kg·m- 2 ·h- 1 ,抗蒸发时间达65 17h ,具有强的粘结、凝并、吸湿、保水、抗高温和固结路面等性能,而且吸附性强,当一次喷洒量为0 5～1 0L·m- 2 时,可有效抑尘5d .