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Development of an evaporation crystallizer for desalination of alkaline organic wastewater before incineration 总被引：2，自引：0，他引：2
A wastewater evaporation-desalination pretreatment method was introduced to remove the Na^＋ and K^＋ salts in volatile organic compounds （VOCs） wastewater before it was fed into the incinerator. VOCs in the wastewater were volatilized in the evaporation system and then the vapor was combusted in an incinerator. Simulated phenol wastewater containing sodium chloride was evaporated and concentrated and sodium chloride was crystallized in different parameters. The experimental results showed that the higher initial concentration of sodium chloride increases the ratio of volatilization of VOCs, which was due to the effect of “salting out” （a decrease in the solubility of the nonelectrolyte in the solution, or more rigorously, an increase in its activity coefficient, caused by the salt addition （Furter and Cook, 1967））. When evaporation speed was increased from 1.67 ml/min to 2.73 ml/min, the total removal coefficient of sodium chloride was about 99.88%-99.99%. This pretreatment procedure eliminates the slag phenomenon caused by Na^＋ and K^＋ salts during wastewater incineration, so the incinerator could operate continuously, and the wastewater evaporation could increase the heat value of wastewater, and the operation cost would be reduced. 相似文献
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我校建于１９７８年 ,经过２０多年的努力 ,目前在校生达３０００多人。为适应技工教育模式的转变 ,提高教育教学质量 ,培养出高质量的应用型技能人才 ,从１９９７年开始 ,我校启动了教育现代化工程 ,经过三年多的艰苦努力 ,在加快教育现代化进程的实践中 ,取得了显著的成效。一、观念现代化作先导教育现代化的最终目的是适应现代社会的要求 ,培养出德才兼备又“适销对路”的合格人才。要加快技工学校教育现代化 ,首先必须更新教育观念 ,克服思想上的一些模糊认识 ,适应时代要求 ,树立现代教育观念。我校面对近年来的高考升学热、技校生质量… 相似文献
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Carcinogenic and mutagenic polycyclic aromatic hydrocarbons (PAHs) generated in coal combustion have caused great environmental health concern. Seventeen PAHs (16 high priority PAHs recommended by USEPA plus Benzo[e]pyrene) present in five raw bituminous coals and released during bituminous coal combustion were studied. The effects of combustion temperature, gas atmosphere, and chlorine content of raw coal on PAHs formation were investigated. Two additives (copper and cupric oxide) were added when the coal was burned. The results indicated that significant quantities of PAHs were produced from incomplete combustion of coal pyrolysis products at high temperature, and that temperature is an important causative factor of PAHs formation. PAHs concentrations decrease with the increase of chlorine content in oxygen or in nitrogen atmosphere. Copper and cupric oxide additives can promote PAHs formation (especially the multi-ring PAHs) during coal combustion. 相似文献
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The combustion behavior of typical components of MSW was examined with a thermal gravimetric analyzer (TGA). The experiments were done over the temperature range of room temperature to 1000℃ at a heating rate of 10 oC/min and in an oxidizing atmosphere. The results indicated that the entire weight loss process of each typical component of MSW consists of one to three distinct combustion stages. The combustion of typical components of MSW could be modeled by one to three independent reactions. The corresponding parameters of typical components of MSW such as activation energy, pre-exponential factor, and reaction order were determined. The calculated results using the comprehensive kinetic model composed of one to three independent and consecutive reactions, agreed well with experimental results. 相似文献
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为了解技校生的职业观,了解技校生职业观的形成及影响因素,从而为学校实施有针对性的就业准备教育,进而为引导学生形成正确的就业观奠定基础,同时也为技校生毕业后顺利就业并适应岗位要求提供指导,笔者对本校学生的择业倾向性进行了调查,从中了解技校生在择业观方面现状及存在的一些问题,并提出相应的对策建议。 相似文献
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当前,技工教育正不断突破原有的格局向前发展。把握技工教育发展的内在规律和机遇,更新观念,深化改革,不断提高教育教学质量,培养市场需要的高技能、高素质、高质量的技能人才,增强毕业生竞争实力,提高就业率,已成为技工学校生存和发展的关键。近几年来,徐州煤炭高级技术学校面对激烈的教育竞争市场,立足能力培养,坚持创新并重,大胆实践,使教学质量、经济效益、社会声誉不断提高。在技工学校普遍招生难、就业难的今天,１９９８—１９９９年,连续两年学校招生过千人,毕业生一次就业率达到９７３%,受到了用人单位和学生家长的普遍欢迎。１９９… 相似文献
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论文提出在进行联合编目、共同建设数据库、寻求资源共享等工作中必须充分关注书目数据的质量问题，必须加强数据编制的标准化和规范化，逐步形成一个工作标准。 相似文献
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