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501.
《Process Safety and Environmental Protection》2014,92(6):509-514
Produced water is the largest wastestream of oil and gas exploration but its chemical composition hinders its beneficial use. Effective treatment and reuse of produced water can mitigate scarcity of fresh water, especially in arid areas. Presence of inorganic compounds such as boron in produced water renders its beneficial use difficult. In this study, boron removal from produced water was investigated. Synthetic wastewater was prepared simulating the range of boron concentrations in produced water. Four operating parameters pH (3–11), charge loading (1200–3600 Ah/m3), contact time (15–90 min) and concentration (10–30 mg/L) were selected and their optimum conditions investigated. The obtained optimum conditions were applied to treat real produced water. Residual boron concentration of 0.3 mg/L was obtained from initial boron concentration of 15 mg/L in real produced water at optimum conditions of pH 7, charge loading 2400 Ah/m3 and contact time 90 min. Boron adsorption could be represented by Langmuir and Freundlich isotherm models. Electrocoagulation can be used for the effective removal of boron from produced water. 相似文献
502.
针对车用液化天然气(LNG)气瓶定期检验的特殊要求,制定出定期检验项目及相应的检验方法。重点对车LNG气瓶静态蒸发率的测试方法进行研究,并给出评判标准。研究成果为车用LNG气瓶的安全应用提供保障,为车用LNG气瓶定期检验标准的制定提供理论依据。 相似文献
503.
通过静态吸附实验,探讨了改性HA对U(Ⅵ)吸附影响。考查pH值、时间、U(Ⅵ)的初始浓度和温度等对吸附的影响。结果表明:pH值对改性腐殖酸的吸附效果影响较大,改性腐殖酸吸附U(Ⅵ)的最佳pH值为6,最大去除率为99.37%,吸附在60 min内基本达到平衡。UO22+在改性腐殖酸上的吸附是放热过程,符合Freundlich等温吸附方程,相关系数达0.99以上,表明IHA对铀的吸附是以表面为主要吸附位,并不是均匀的单层吸附。图8,参9. 相似文献
504.
Zhen Li Zhaofu Qiu Ji Yang Benteng Ma Shuguang Lu Chuanhui Qin 《Frontiers of Environmental Science & Engineering》2018,12(6):15
A spent fluid catalytic cracking (FCC) catalyst containing lanthanum (La) was used as a novel adsorbent for phosphorus (P) in simulated wastewater. The experiments were conducted in a batch system to optimize the operation variables, including pH, calcination temperature, shaking time, solid-liquid ratio, and reaction temperature under three initial P-concentrations (C0 = 0.5, 1.0, and 5.0 mg/L). Orthogonal analysis was used to determine that the initial P-concentration was the most important parameter for P removal. The P-removal rate exceeded 99% and the spent FCC catalyst was more suitable for use in low P-concentration wastewater (C0 <5.0 mg/L). Isotherms, thermodynamics and dynamics of adsorption are used to analyze the mechanism of phosphorus removal. The results show that the adsorption is an endothermic reaction with high affinity and poor reversibility, which indicates a low risk of second releasing of phosphate. Moreover, chemical and physical adsorption coexist in this adsorption process with LaPO4 and KH2PO4 formed on the spent FCC catalyst as the adsorption product. These results demonstrate that the spent FCC catalyst containing La is a potential adsorbent for P-removal from wastewater, which allows recycling of the spent FCC catalyst to improve the quality of water body.
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开放静置体系中白地霉Y1对染料脱色降解研究 总被引:2,自引:0,他引:2
采用白地霉Y1对染料进行脱色,考察了染料初始浓度、接种量、pH值、C/N比和温度等因素对白地霉降解溴酚蓝的影响,并对其降解机理进行了探讨。实验结果表明:白地霉能在开放静置条件下对部分染料进行有效的脱色,对溴酚蓝尤其有效。开放静置体系下,白地霉能对300 mg/L的溴酚蓝进行脱色,脱色pH和温度分别为2~8、25~40℃,高碳低氮环境中更有利于脱色,接种量对染料脱色影响不大。通过对胞外液絮凝及脱色作用、葡萄糖代谢情况及染料脱色扫描图谱分析表明,白地霉主要通过分泌胞外液对溴酚蓝进行作用,且能对溴酚蓝有效降解。 相似文献
509.
接枝羧基淀粉对贵金属离子吸附性能研究 总被引:5,自引:0,他引:5
研究了接枝羧基淀粉(ISC)对贵金属离子Ag(Ⅰ),Pd(Ⅱ)、Pt(Ⅳ)的静态吸附性能和选择性及介质的PH对其吸附性能的影响,利用接枝羧基淀粉与Ag(Ⅰ)形成螯合物的红外光谱和X-射线光电子能谱数据(XPS)探讨了其吸附作用机理。 相似文献
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