SNCR脱硝技术在某水泥厂脱硝工程应用

通过对某水泥厂水泥生产线进行SNCR脱硝测试,考察不同的喷射位置、覆盖范围、NSR以及温度等因素对SNCR技术脱硝效率的影响。测试结果表明:SNCR脱硝技术在水泥生产线上可以获得超过88%的脱硝效率,NO x排放浓度可以低于200 mg/m3。     

内蒙古典型草原和锡林河湿地群落非生长季土壤呼吸特征对比研究

本文监测了内蒙古典型草原和锡林河湿地群落非生长季土壤呼吸速率的日动态变化;同时对大气和土壤的温度变化进行测量.研究发现两类群落在非生长季的土壤呼吸速率的变化方式均为单峰模式.典型草原土壤呼吸速率显著低于同期湿地的土壤呼吸速率(P=0.01).典型草原土壤呼吸速率对温度的相关性为0.48,低于湿地的0.86.     

Determination of time- and size-dependent fine particle emission with varied oil heating in an experimental kitchen

Particulate matter(PM) from cooking has caused seriously indoor air pollutant and aroused risk to human health.It is urged to get deep knowledge of their spatial-temporal distribution of source emission characteristics,especially ultrafine particles(UFP 100 nm) and accumulation mode particles(AMP 100-555 nm).Four commercial cooking oils are auto dipped water to simulate cooking fume under heating to 255℃ to investigate PM emission and decay features between 0.03 and 10 μm size dimension by electrical low pressure impactor(ELPI) without ventilation.Rapeseed and sunflower produced high PM_(2.5) around5.1 mg/m~3,in comparison with those of soybean and corn(5.87 and 4.55 mg/m~3,respectively)at peak emission time between 340 and 450 sec since heating oil,but with the same level of particle numbers 6-9 × 10~5/cm~3.Mean values of PM_(1.0)/PM_(2.5) and PM_(2.5)/PM_(10) at peak emission time are around 0.51-0.55 and 0.23-0.29.After 15 min naturally deposition,decay rates of PM_(1.0),PM_(2.5) and PM_(10) are 13.3%-29.8%,20.1%-33.9%and 41.2%-54.7%,which manifest that PM_(1.0) is quite hard to decay than larger particles,PM_(2.5) and PM_(1.0).The majority of the particle emission locates at 43 nm with the largest decay rate at 75%,and shifts to a larger size between137 and 555 nm after 15 min decay.The decay rates of the particles are sensitive to the oil type.     

规划环境影响评价的发展机遇与挑战

《环境影响评价法》的出台，为我国规划环境影响评价提供了新的发展机遇，同时也对传统项目环境影响评价和规划环境影响评价的发展提出了严峻的挑战。为促进《环境影响、平价法》的实施，笔者认为充分认识项目环境影响评价的局限性，加强规划环境影响评价的理论创新研究和实践，是当前应着手准备解决的问题。本文在分析传统环境影响评价局限性的基础上，研究了规划环境影响评价的发展机遇和挑战，以期能对国内规划环境影响评价工作的开展提供一些参考。     

新疆土壤盐渍化成因及其防治对策研究

论述了新疆土壤盐渍化形成的地质、地貌、土壤质地和人为灌溉方式不合理等原因,说明土壤盐渍化是一种自然现象。通过调查,目前新疆盐渍化土壤主要有稳定脱盐型、脱盐聚盐混合型、脱盐聚盐反复型、持续聚盐型和灌溉聚盐型,其中脱盐聚盐混合型和脱盐聚盐反复型分布最为广泛,稳定脱盐型仅分布于竖井排灌区。总结了新疆土壤盐渍化的治理研究过程及国内外防治土壤盐渍化的措施,提出了竖井排灌工程是防治新疆土壤盐渍化最有效的措施。通过工程实例,证明了竖井排灌具有降低地下水位和灌溉作用,且经济效益明显。     

土壤污染研究现状与趋势

简要介绍了土壤污染研究领域的主要内容 ,归纳了土壤污染研究中一些主要方法。结合土壤污染发展特点 ,对今后土壤污染研究的重点方向作了一般性探讨。     

生长温度对盾叶薯蓣POD活性等生理特性的影响

研究了15℃、20℃、25℃、30℃和35℃五个不同温度条件下盾叶薯蓣一些生理参数的变化.结果显示,盾叶薯蓣叶片的POD活性和MDA含量的变化呈V字形,其中在25℃时处于最低点;可溶性蛋白含量的变化呈M字形,可溶糖含量的变化呈W字形.在15℃、20℃、30℃和35℃下, 5d内,随着时间的延长,MDA含量增加,POD活性、可溶性蛋白和可溶性糖的含量下降;在25℃下,盾叶薯蓣的POD活性以及MDA、可溶性蛋白和可溶性糖的含量变化较小,相对稳定,所以25℃是最为适宜的生长温度. 图1表1参20     

Development of a PCR strategy for thraustochytrid identification based on 18S rDNA sequence

The identification and characterization of the thraustochytrids, an emerging economically and biotechnologically important group of marine heterotrophic protists, is usually based on morphological characters. In this research we used molecular markers to identify thraustochytrids. We designed three sets of primers based on the 18S rDNA sequence alignment of known strains and employed a PCR (polymerase chain reaction) strategy to identify unknown thraustochytrid isolates. DNA from 26 thraustochytrids (three isolated from primary cell cultures of the tunicate Botryllus schlosseri and 23 from a coral holding aquarium) were amplified by these primers, revealing 21 isolates with three bands each, which were assigned to two groups according to PCR fragment sizes. Taxonomic characterizations were deduced by comparing with GenBank data. Four isolates were further studied by sequencing their 18S rDNA. Sequence alignments and phylogenetic analysis revealed that isolates from the coral aquarium (7-5 and 8-7) were highly similar to each other and 95.0-97.0% similar to Thraustochytrium multirudimentale and Schizochytrium minutum. Isolates from the tunicate primary cell cultures (BS1 and BS2) were also closely related to each other and 84.3-86.0% similar to labyrinthulid quahog parasite and Thraustochytrium pachydermum. AFLP (amplified fragment-length polymorphism) analysis revealed 2.5-3.6% differences within the genomic DNA of each group, showing that each isolate is different, although isolates within each group may belong to the same species, in spite of differences found in the general morphology.     

有机化合物水中溶解度的测定与估算

本文介绍用摇瓶法、产生柱法和动态联柱高效液相色谱法等方法测定有机化合物在水中溶解度的研究方法,同时给出了某些农药、硝基多环芳烃和氯苯类化合物的水中溶解度的实验数值.     

土壤环境中砷污染的危害及其研究进展

本文综述了砷污染的危害及其形成原因，介绍了国内外土壤砷污染研究的现状，展望了21世纪砷污染研究的发展趋势．