Highly efficient photodegradation of the pesticide metolcarb induced by Fe complexes

Here we show the efficient photoinduced degradation of the pesticide metolcarb, in less than 400 min, using iron(III) aquacomplexes and 365 nm light. The degradation is mainly due to the formation of hydroxyl radical. It was complete when molecular oxygen was present. The analytical study gives evidence for the primary formation of several byproducts formed from 1) the scission of the O–C bond, 2) the hydroxylation of the aromatic moiety and 3) the attack of the two methyl groups. Under prolonged irradiation and in aerated solutions, efficient mineralization was evidenced by the study of total organic carbon evolution as a function of irradiation time.     

进一步保持和发扬我党的"真正优势"

本文在全面论述邓小平同志关于"共同的理想"和"铁的纪律"是我党"真正优势"光辉论断的基础上,指出目前我们在保持和发扬"真正优势"方面存在的不足,并认为中国共产党要顺利解决"两大历史性课题",必须进一步保持和发扬自己的"真正优势".     

基于空腔流动理论的市政消火栓盲端铁迁移扩散机理研究

市政消火栓滞水严重，存在积累扩散亚铁离子（Fe²⁺）的问题，可能引发"红水"现象，威胁供水卫生安全.以往的管网水质模拟缺少对消火栓盲端支管的研究，难以准确模拟消火栓铁释放现象，使得计算精确度不足.针对上述问题，本研究尝试运用空腔流动机理分析市政消火栓构成的盲端支管内Fe²⁺迁移扩散现象，结合扩散实验和数值模拟，构建盲端支管Fe²⁺扩散的流体力学模型，定量分析管长、管径、流速等因素的影响规律，为精确模拟消火栓水质提供参考.     

难降解混合化工废水预处理试验研究

对某化工开发区混合化工废水进行预处理试验研究，分别对铁还原后加中和混凝沉淀以及直接中和混凝沉淀两种预处理方法进行了试验，重点讨论了铁还原工艺的各种影响因素。研究了曝气与不曝气，加炭与不加炭以及不同CODCr、不同pH值对铁还原处理效果的影响，并考察了铁的消耗与废水中铁离子的作用及变化情况。     

废铁屑处理难生物降解染料废水

研究了用废铁屑处理难生物降解的染料废水，考察了进pH值、曝气时间、固液比、铁屑粒度对废水处理效果的影响，并确定了适宜实验条件。实验证明，该法可以有效去除染料废水的色度和CODcr，在实验考察范围内，脱色率和CODcr去除率分别可达90％、61.7%。同时废水可生化性也得到了改善，BOD5／CODcr从19.6%上升到29.5%，提高了50％,有利于后续生化处理。该法以废治废，是一种很有实用价值的废水处理方法。     

Acute temperature dependency in the cleansing of tarry feathers utilizing magnetic particles

We have conducted temperature-dependent studies on the removal of a solidified tarry residue from feathers using magnetic particles. These studies demonstrate an acute temperature dependency whereby no contaminant at all is removed below a certain temperature but, at and above this temperature, the removal rapidly approaches 100%. Significantly, this temperature is well below the temperature at which the tarry residue becomes a flowing liquid. This demonstrates that it is possible for magnetic cleansing to remove up to 100% of tarry residue from feathers under temperature conditions that would be benign to a bird.     

Resurrection of the iron and phosphorus resource in steel-making slag

 This research focused on the treatment of steel-making slags to recycle and recover iron and phosphorus. The carbothermal reduction behavior of both synthesized and factory steel-making slag in microwave irradiation was investigated. The slags were mixed with graphite powder and heated to a temperature higher than 1873 K to precipitate a lump of Fe–C alloy with a diameter of 2–8 mm. The larger the carbon equivalent (C_eq, defined in the text), the higher the fractional reduction of iron and phosphorus. An increase in the SiO₂ content of slag led to a considerable improvement in the reduction for both iron and phosphorus because of the improvement in the fluidity of the slags and an increase in the activity coefficient of P₂O₅ in the slags. The extraction behavior of phosphorus from Fe–P–C_satd alloy was also investigated at 1473 K by carbonate flux treatment. For all the experiments with a processing time longer than 10 min, the phosphorus in the fluxes could be concentrated to more than 9% (w/w) showing that it could be used as a phosphorus resource. Compared with K₂CO₃ flux treatment, that using Na₂CO₃ was more effective for the extraction of phosphorus, and this was attributed to the lower evaporation of Na₂CO₃. Finally, a recycling scheme for steel-making slag is proposed. Received: March 16, 2001 / Accepted: November 12, 2001     

浅谈煤气管道防腐

系统地介绍了埋地煤气钢管的两种防腐方法；绝缘层防腐法，电保护防腐法，详细地阐述了防腐的原理及施工要求。     

非燃烧区瓦斯爆炸冲击波在单向分岔管道内传播规律的试验研究

在空间上瓦斯爆炸可以分为瓦斯燃烧区、非瓦斯燃烧区两个区域.在瓦斯燃烧区内冲击波和火焰是相互耦合的;当瓦斯燃烧完毕后燃烧波消失,只剩非瓦斯燃烧区冲击波,冲击波失去能量支持,最终恢复至正常大气参数.为了研究非燃烧区内瓦斯爆炸冲击波在分岔管道中的传播特性,搭建了截面为80 mm× 80 mm的方形管道,分别由1 m、1.5m、2.5 m、3m、4m等5种长度不等的管道组合而成.管道由3个部分组成,前端为直管道瓦斯填充区,中间管道为空气直管道和管道末端,末端设计了30°、45°、60°、90°四种单向分岔角度.通过瓦斯填充量和管道分岔角度两个变量,采用TST6300动态数据采集储存仪,对管道内瓦斯爆炸冲击波能量及冲击波在单向分岔情况下超压分流情况进行试验研究.结果表明,管道单向分岔条件下,非燃烧区瓦斯爆炸冲击波分流系数与冲击波初始超压及管道分岔角度有关,分流系数随冲击波初始超压及分岔角度的增加而增加.     

Low-carbon transition of iron and steel industry in China: Carbon intensity,economic growth and policy intervention

As the biggest iron and steel producer in the world and one of the highest CO2 emission sectors, China’s iron and steel industry is undergoing a low-carbon transition accompanied by remarkable technological progress and investment adjustment, in response to the macroeconomic climate and policy intervention. Many drivers of the CO2 emissions of the iron and steel industry have been explored, but the relationships between CO2 abatement,investment and technological expenditure, and their connections with the economic growth and governmental policies in China, have not been conjointly and empirically examined. We proposed a concise conceptual model and an econometric model to investigate this crucial question. The results of regression, Granger causality test and impulse response analysis indicated that technological expenditure can significantly reduce CO2 emissions, and that investment expansion showed a negative impact on CO2 emission reduction. It was also argued with empirical evidence that a good economic situation favored CO2 abatement in China’s iron and steel industry, while achieving CO2 emission reduction in this industrial sector did not necessarily threaten economic growth.This shed light on the dispute over balancing emission cutting and economic growth.Regarding the policy aspects, the year 2000 was found to be an important turning point for policy evolution and the development of the iron and steel industry in China. The subsequent command and control policies had a significant, positive effect on CO2 abatement.