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141.
142.
Yi Zhao Bo Yuan Zhen Qian Zili Zhang Le Fu Shihang Pan Runlong Hao 《环境科学学报(英文版)》2022,120(10):144-157
Microwave radiation has received extensive attention due to its significant thermal and non-thermal effects, and the development of MW-based denitrification in flue gas has become one of the most promising methods to avoid the defects of ammonia escape, high temperature and cost in traditional SCR. This review introduces the thermal and non-thermal effects of microwaves and divides MW-based denitrification methods into MW reduction and oxidation denitrification, systematically summarizes these denitrification methods, including MW discharge reduction, MW-induced catalytic reduction using active carbon, molecular sieves, metal oxides (transition metals, perovskites, etc.), MW-induced oxidation denitrification with and without additional oxidant, and discusses their removal pathway and mechanism. Finally, several research prospects and directions regarding the development of microwave-based denitrification methods are provided. 相似文献
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144.
Experiments were conducted in a fixed-bed reactor containing a commercial V2O5/WO3/TiO2 catalyst to investigate mercury oxidation in the presence of HCl and O2. Mercury oxidation was improved significantly in the presence of HCl and O2, and the Hg0 oxidation efficiencies decreased slowly as the temperature increased from 200 to 400°C. Upon pretreatment with HCl and O2 at 350°C, the catalyst demonstrated higher catalytic activity for Hg0 oxidation. Notably, the effect of pretreatment with HCl alone was not obvious. For the catalyst treated with HCl and O2, better performance was observed with lower reaction temperatures. The results showed that both HCl and Hg0 were first adsorbed onto the catalyst and then reacted with O2 following its adsorption, which indicates that the oxidation of Hg0 over the commercial catalyst followed the Langmuir–Hinshelwood mechanism. Several characterization techniques, including Hg0 temperature-programmed desorption (Hg-TPD) and X-ray photoelectron spectroscopy (XPS), were employed in this work. Hg-TPD profiles showed that weakly adsorbed mercury species were converted to strongly bound species in the presence of HCl and O2. XPS patterns indicated that new chemisorbed oxygen species were formed by the adsorption of HCl, which consequently facilitated the oxidation of mercury. 相似文献
145.
The non-biodegradable and chemically very stable phosphonates are used in a variety of industrial applications including cooling
waters, oil production and textile industry. We show here that they are degraded in the presence of Mn(II) and oxygen. The
half-life for the reaction is 9 min near neutral pH. The presence of other cations such as Ca(II) and Zn(II) considerably
slows down the reaction by competition with Mn(II) for the phosphonate. The reaction involves the oxidation of complexed Mn(II)
by oxygen to Mn(III) and the subsequent oxidation of phosphonate by Mn(III) thus yielding two stable phosphonic acid breakdown
products. The oxidation also proceeds in the presence of the mineral manganite (Mn(III)OOH), and yields the same breakdown
products. The use of a newly developed chromatographic method revealed the presence of the breakdown products in wastewater.
The results show that manganese-catalyzed oxidation might be an important pathway for phosphonate degradation in natural waters.
Electronic Publication 相似文献
146.
粘胶纤维生产废水处理的工艺研究 总被引:2,自引:0,他引:2
处理粘胶纤维生产废水的工艺,采用分步逐段的技术方法,即酸,碱废水混曝气除硫化物加碱一步沉淀法除锌的处理技术以及用新型氧化混凝剂继续处理废水的有机物CODcr,出水CODcr为50mg/L左右,CODcr平均去除率达81.37%,达到国家及地方排放标准。 相似文献
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149.
本文以甘肃某一油漆生产企业为例,分析了油漆生产废水水质、水量特点及隔油-气浮-氧化沟处理工艺存在的主要问题:出水石油类超标、废水可生化性差及氧化沟积泥。提出了强化预处理、增设水解酸化工艺及优化生物处理措施的方案,提高废水的可生化性,使最终出水稳定达标(GB8978—1996一级标准)排放。最后对改进工艺的技术经济可行性进行了初步探索,分析证明改进工艺针对性强、经济合算,适合该企业的废水处理。 相似文献
150.
《环境科学学报(英文版)》2023,35(3):376-387
In the oxidation treatment of textile dyeing sludge, the quantitative and transformation laws of organic chlorine are not clear enough. Thus, this study mainly evaluated the treatment of textile dyeing sludge by Fenton and Fenton-like system from the aspects of the influence of Cl−, the removal of polycyclic aromatic hydrocarbons (PAHs) and organic carbon, and the removal and formation mechanism of organic chlorine. The results showed that the organic halogen in sludge was mainly hydrophobic organic chlorine, and the content of adsorbable organic chlorine (AOCl) was 0.30 mg/g (dry sludge). In the Fenton system with pH=3, 500 mg/L Cl−, 30 mmol/L Fe2+ and 30 mmol/L H2O2, the removal of phenanthrene was promoted by chlorine radicals (•Cl), and the AOCl in sludge solid phase increased to 0.55 mg/g (dry sludge) at 30 min. According to spectral analysis, it was found that •Cl could chlorinate aromatic and aliphatic compounds (excluding PAHs) in solid phase at the same time, and eventually led to the accumulation of aromatic chlorides in solid phase. Strengthening the oxidation ability of Fenton system increased the formation of organic chlorines in liquid and solid phases. In weak acidity, the oxidation and desorption of superoxide anion promoted the removal and migration of PAHs and organic carbon in solid phase, and reduced the formation of total organic chlorine. The Fenton-like system dominated by non-hydroxyl radical could realize the mineralization of PAHs, organic carbon and organic chlorines instead of migration. This paper builds a basis for the selection of sludge conditioning methods. 相似文献