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321.
啤酒废水的水解——好氧处理技术(H/O工艺) 总被引:3,自引:0,他引:3
比较了啤酒废水的几种处理工艺,介绍了水解——好氧(H/O)工艺的特性及其主要设计参数。 相似文献
322.
Xu Bin Gao Naiyun Rui Min Wang Hong Wu Haihui 《Frontiers of Environmental Science & Engineering in China》2007,1(3):350-356
The ozone oxidation of endocrine disruptor bisphenol A in drinking water was investigated. A stainless completely mixed reactor
was employed to carry out the degradation experiments by means of a batch model. With an initial concentration of 11.0 mg/L,
the removal efficiencies of BPA (bisphenol A) could be measured up to 70%, 82%, and 90% when the dosages of ozone were 1,
1.5, and 2 mg/L, respectively. The impacts on BPA degradation under the conditions of different ozone dosages, water background
values, BPA initial concentrations, and ozone adding time were analyzed. The results showed that ozone dosage plays a dominant
role during the process of BPA degradation, while the impact of the contact time could be ignored. UV wavelength scanning
was used to confirm that the by-products were produced, which could be absorbed at UV254. The value of UV254 was observed
to have changed during the ozonation process. Based on the change of UV254, it could be concluded that BPA is not completely
degraded at low ozone dosage, while shorter adding time of total ozone dosage, high ozone dosage, and improvement of dissolved
ozone concentration greatly contribute to the extent of BPA degradation. The effects of applied H2O2 dose in ozone oxidation of BPA were also examined in this study. The O3-H2O2 processes proved to have similar effects on the degradation of BPA by ozone oxidation.
Translated from Environmental Science, 2006, 27(2): 294–299 [译自: 环境科学] 相似文献
323.
为了追求更好的森林管理效果,对相关森林政策的实施,不是仅仅停留在传统的狭义的行政管理部门上,同时还要涉厦到经营者、市民以及当地居民等利益相关者。使他们都要以相互协调的方式参与到森林管理当中来。它是建立在一定的森林价值观基础上,基于科学原理井突破以往的技术层面而对森林进行的一系列更加合理的管理措施体系。本文以日本神奈川县的林业政策形成过程为例对森林治理问题进行了讨论。 相似文献
324.
Gao Baoyu Chu Yongbao Yue Qinyan Kong Chunyan Wang Xiaona 《Frontiers of Environmental Science & Engineering in China》2007,1(3):368-373
In order to investigate the characteristics of pure Nano-Al13, Nano-Al13 was separated and purified from a series of poly-aluminum chloride (PAC) solutions which had the same Al13 percentage but different total Al concentrations, by using column chromatography, ethanol-acetone resolving and SO2−
4/Ba2+ displacement. The Al13 species yield was characterized by Al-ferron timed complexation spectrophotometry and 27Al-NMR (nuclear magnetic resonance). The coagulation efficiency of Nano-Al13, PAC and AlCl3 in synthetic water was also investigated by Jar tests. The dynamic process and aggregation state of kaolin suspensions coagulating
with Nano-Al13, PAC and AlCl3 were similarly investigated using a photometric dispersion analyzer 2000 (PDA2000). The experimental results indicated that
the ethanol-acetone resolving method was simple and could separate the PAC solution at different concentrations, while column
chromatography could separate PAC solutions at low concentrations. The SO4
2−/Ba2+ displacement method could separate PAC solutions at high concentrations. However, extra inorganic cation and anion could
be added in the solution during separation. The coagulation efficiency and dynamic experimental results showed that Nano-Al13 with high positive-charged species was effective in removing turbidity and color. The dynamic process results showed that
Nano-Al13 also had the best recovery capability after shearing compared with PAC and AlCl3 because the Nano-Al13 conformation is more effective in charge neutralization.
Translated from Acta Scientiae Circumstantiae, 2005, 25(6): 767–772 [译自: 环境科学学报] 相似文献
325.
Development and application of innovative technologies for drinking water quality assurance in China
Qu Jiuhui Yin Chengqing Yang Min Liu Huijuan 《Frontiers of Environmental Science & Engineering in China》2007,1(3):257-269
The continuously deteriorating quality of source water is threatening the safety of drinking water in China. Various efforts
have been made to update water treatment processes to decrease the pollution problems of drinking water, such as protection
of drinking water sources, enhancement of conventional treatment processes, and development of new or advanced treatment technologies.
This paper reviews a variety of protection and remediation methods for drinking water sources, development and application
of drinking water treatment technologies, new technologies for special pollutants removal from groundwater, and the latest
research progress on water distribution systems in China. 相似文献
326.
通过对转向锤臂锻件结构与工艺的改进 ,改变了该锻件的锻模结构 ,提高了该锻件的模锻工艺性和经济效益。 相似文献
327.
328.
以相同Al13含量、不同浓度的PAC为原料,利用乙醇-丙酮混合溶剂法、SO4^2-/Ba^2 沉淀置换法以及柱层析法分离提纯纳米Al13形态,同时利用Al-Ferron逐时络合比色法、^27Al-NMR等多种现代分析手段进行分析鉴定,比较其分离效果,并采用烧杯实验法和透光率脉动检测技术对Al13形态以及PAC、AlCl3的絮凝效果及絮凝过程中絮集物形成和增长的变化差异作了对比性研究.实验结果表明,乙醇.丙酮混合溶剂法对Al13分离纯化效果最好,分离所得Al13平均粒径大,聚合程度高.柱层析法受柱体积的影响只对低浓度的PAC有较好的分离效果;SO4^2-/Ba^2 沉淀置换法虽具有较好的分离效果,但分离过程有其他杂质离子的加入,影响到产品品质.混凝效果和动态实验结果表明,Al13形态是在絮凝过程中起电中和作用的主要形态,具有较强的除浊及脱色能力,在混凝过程中当絮体受到剪切力的破坏时Al13形态比PAC和AlCl3具有更强重新絮凝的能力. 相似文献
329.
330.
Life cycle assessment is emerging as a powerful tool in the evaluation of the environmental impact of manufacturing processes. This paper describes a general methodology for the life cycle analysis of manufacturing processes taking into account the flexibility and decision-making potential of knowledge base systems. Emphasis is placed on on-site waste minimisation and associated sustainability characteristics in relation to environmental impact assessment and process improvement. The ensuing software model is applied with some success to an initial study of pulp and paper manufacture. 相似文献