硝基苯类废水的预处理技术研究

Fe(OH)2对硝基苯具有强烈的还原作用，短时间内可把硝基苯还原为苯胺。催化铁屑法处理硝基苯类废水，除了包括铁屑法处理废水的各种反应外，还能使硝基苯在其表面直接还原，且反应在弱碱性条件下效果较好。m(Fe)：m(Cu)为10：1，pH为9．5，废水硝基苯进水质量浓度为250mg／L，反应时间为30min，硝基苯的去除率达100％。     

Biological removal of methanol from process condensate for the purpose of reclamation

The biological removal of methanol from condensate of ammonia manufacturing processes for the purpose of reclamation using contact type reactor was studied. Methanol of 60 mg/L was removed completely under an HRT of 1.12 h. Optimal inorganic nutrient dose was determined on evaluating methanol removal performance and dehydrogenase activities (DHA) under different nutrition doses. The optimal inorganic nutrient dose only gave an increase of conductivity of ca. 10μs/cm^2 in the effluent on treating synthetic condensate containing methanol of 30mg/L. The results demonstrated that biological removal of methanol was effective for the purpose of recovering the methanol-bearing condensate.     

Pollution characteristics and health risk assessment of polycyclic aromatic hydrocarbons and nitrated polycyclic aromatic hydrocarbons during heating season in Beijing

Polycyclic aromatic hydrocarbons(PAHs) and their nitrated derivatives(NPAHs) attract continuous attention due to their outstanding carcinogenicity and mutagenicity. In order to investigate the diurnal variations, sources, formation mechanism, and health risk assessment of them in heating season, particulate matter(PM) were collected in Beijing urban area from December 26, 2017 to January 17, 2018. PAHs and NPAHs in PM were quantitatively analyzed via gas chromatography-mass spectrometry(GC-MS). ...     

黑色岩系中贵金属富集层的成因:来自固定铵的佐证

对湘黔地区（遵义、大庸）下寒武统牛蹄塘组黑色岩系的部分样品进行了Au、Ag、PGE、固定铵的分析，综合前人的资料进行了数据的对比和讨论，首次应用其中的固定铵来讨论了贵金属富集层的成因。     

关于海洋资源的资产属性与资产化管理

通过对海洋资源的基本特性分析,论证了海洋资源的资产属性和把海洋资源纳入资产化管理的合理性,并从宏观与微观两个层面对海洋资源进行资产化管理的有关核算问题作了探讨。指出只有合理的海洋资源核算,才能明确界定海洋资源产权,实现海洋资源的高效利用。     

Characteristics of phosphorus chemistry and its geographical distribution in the Haihe River valley,North China

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Comparing dark- and photo-Fenton-like degradation of emerging pollutant over photo-switchable Bi2WO6/CuFe2O4: Investigation on dominant reactive oxidation species

The extensive use of tetracycline hydrochloride (TCH) poses a threat to human health and the aquatic environment. Here, magnetic p-n Bi₂WO₆/CuFe₂O₄ catalyst was fabricated to efficiently remove TCH. The obtained Bi₂WO₆/CuFe₂O₄ exhibited 92.1% TCH degradation efficiency and 50.7% and 35.1% mineralization performance for TCH and raw secondary effluent from a wastewater treatment plant in a photo-Fenton-like system, respectively. The remarkable performance was attributed to the fact that photogenerated electrons accelerated the Fe(III)/Fe(II) and Cu(II)/Cu(I) conversion for the Fenton-like reaction between Fe(II)/Cu(I) and H₂O₂, thereby generating abundant ?OH for pollutant oxidation. Various environmental factors including H₂O₂ concentration, initial pH, catalyst dosage, TCH concentration and inorganic ions were explored. The reactive oxidation species (ROS) quenching results and electron spin resonance (ESR) spectra confirmed that ?O₂^? and ?OH were responsible for the dark and photo-Fenton-like systems, respectively. The degradation mechanisms and pathways of TCH were proposed, and the toxicity of products was evaluated. This work contributes a highly efficient and environmentally friendly catalyst and provides a clear mechanistic explanation for the removal of antibiotic pollutants in environmental remediation.     

丹江口水库水位抬高面临的挑战及其对策

移民与生态环境问题是丹江口水库水位抬高所面临的主要问题。移民问题是水位抬高首当其冲需要解决的难题,存在政策法规、移民资金、安置措施、脱贫致富等问题,需要以市场为导向,综合考虑诸多因素,制定可行的移民规划,确保移民的稳定和发展。生态环境问题是非常艰巨的问题,水土流失严重、污染源与污染总量日益增加、水质下降、支流库湾富营养化进程加剧等问题将困扰水库的运行与管理,后靠移民的生产生活也在一定程度上对生态环境产生影响;建议成立专门的监管机构,全方位开展水源地保护工作,确保水库水质安全和南水北调中线工程战略目标的实现。     

Particle number size distribution and new particle formation: New characteristics during the special pollution control period in Beijing

New particle formation is a key process in shaping the size distribution of aerosols in the atmosphere.We present here the measurement results of number and size distribution of aerosol particles (10-1...     

燃煤氮氧化物排放控制技术研究进展及相关思考

简述了燃煤氮氧化物的产生、迁移、转化规律及其对环境造成的危害，综述了燃煤氮氧化物排放控制技术研究进展和存在的问题，提出了可供参考的相关建议及解决的方案途径。