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本文采用离子交换法处理含铬(VI)废水。实验结果表明,离子交换法处理含铬废水的最佳条件为:废水pH为4、交换时间为60min、交换温度为45℃、树脂投加量为0.9g。在此条件下,可使50mL废水中铬(VI)浓度由50mg/L降至0.02mg/L,达到了污水综合排放标准。 相似文献
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研究了铁屑-活性炭微电解法处理含铬(Ⅵ)废水的工艺条件及机理.试验结果表明,在未调节废水pH值(0.5)的条件下,铁屑与活性炭的质量比为10:1,反应温度为25℃,反应时间为60min,处理的废水量为30mL/g物料,铬(Ⅵ)的去除率为97.92%,处理后的水中铬(Ⅵ)浓度为0.051 mg/L,远低于国家污水综合排放标准(GB 8978-1996)第一类污染物最高允许排放浓度.用铁屑一活性炭微电解法处理含铬(Ⅵ)废水比单独用铁屑还原或活性碳吸附处理含铬(Ⅵ)废水效果好. 相似文献
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废弃农林生物质在含铬废水处理中的应用 总被引:2,自引:0,他引:2
简单介绍了废弃农林生物质处理含铬废水的优缺点,归纳了废弃农林生物质对含铬废水处理的基本机理,综述了国内外在废弃农林生物质处理含铬废水的研究进展,总结了废弃农林生物质处理含铬废水的主要影响因素以及废弃农林生物质吸附剂的再生方法。指出废弃农林生物质是一种以废治废的综合污染治理技术,具有良好的发展前景。 相似文献
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含铬废水因其对环境危害性大,寻求处理效果好、经济性能高的处理方法和处理材料一直是研究的热点,农林废弃物因其来源广泛,低价易得而颇受青睐。简述了农林废弃物处理含铬废水的基本机理和影响因素,分析了农林废弃物处理含铬废水的优点,指出农林废弃物在处理含铬废水的技术前景及其在电镀废水处理方面的可行性,探讨了农林废弃物处理含铬废水时可能出现的技术问题。 相似文献
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采用几种方法对粉煤灰进行湿法改性,并探讨了改性粉煤灰对实验室模拟含铬废水的去除效果。实验结果表明,AlCl3和FeCl3改性粉煤灰处理5 mg/L含铬废水10 mL,调节pH值4,投加3 g改性粉煤灰,反应90 min后,六价铬的去除率可达99%。因此,粉煤灰可以作为一种有效的吸附剂来处理含铬废水。 相似文献
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Zongping Wang Lizhi Huang Lin Du Jiewen Su Hua Sheng Bo Lv 《Chemical Engineering Communications》2013,200(7):1048-1056
This study investigates the photocatalytic degradation of dyeing wastewater by iron-rich montmorillonite (MMt) under a 25 W low-pressure mercury lamp (λ = 254 nm, I = 48.4 μW/cm2). Exposing MMt to UV irradiation worked to catalyze the photobleaching of wastewater used in the dyeing process. COD removal efficiencies of 65.0% and 74.0% were achieved in 1 g/L MMt suspensions at a pH of 3 in the absence and presence of 30 min of UV irradiation, respectively. A decolorization efficiency of 71.4% was reached with 1 g/L MMt suspensions at a pH of 3 after 30 min of UV irradiation, while only 4.9% decolorization was attained in darkness. These results indicate that iron-rich MMt is a good photocatalyst for decolorization and COD removal in wastewater from dyeing processes. A low pH value is beneficial to the decolorization of dyeing wastewater. A preliminary photocatalytic mechanism is proposed: the iron in the MMt is responsible for the decolorization of the wastewater because it produces a highly oxidative species of hydroxyl radicals (?OH). 相似文献
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针对某企业两片罐生产过程中产生的乳化液废水和酸洗废水具有排放不规律、波动性大以及酸洗废水易对处理工艺造成pH冲击的特点,提出了乳化液废水和酸洗废水的预处理方案。对乳化液废水采用酸化破乳联合高效油水分离器的预处理方法;对酸洗废水和破乳后的乳化液废水采用两级pH调节处理工艺,提高含油废水的抗pH冲击负荷能力、降低废水中F-、PO43-和SO42-等复合无机污染物的浓度,实现除油中和沉淀一体化。出水水质达到GB 8978-1996中的三级标准,处理费用为2.59元/m3。 相似文献
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Gregory D. Boardman Hans J. Seyffert William R. Knocke 《Chemical Engineering Communications》1992,114(1):89-102
The pulp and paper industry is the third largest industrial consumer of fresh water in the United States. The current use rate of over two trillion gallons annually is expected to increase as the demand for paper products continues to rise
Of the various methods of producing paper from wood, the Kraft process is the most widely used. Color, dissolved and suspended organic matter, and dissolved inorganic solids are major pollutants in Kraft processing wastewater. Current federal regulations limit the amount of solids and organic matter that a Kraft facility may dispose into public waters, so most plants have some form of wastewater treatment
In this study, the capacity of a continuous-flow, foam separation system to effect removals of color from a Kraft process wastewater was evaluated. The cationic surfactant, EHDABr, was used to precipitate color bodies in the wastewater and create a foam to carry the precipitates from the wastewater. The effect of pH adjustment was also considered. Color removals in the area of 90% were achieved
Removal of precipitated solids was enhanced by increasing the detention of wastewater in the treatment system. 相似文献
Of the various methods of producing paper from wood, the Kraft process is the most widely used. Color, dissolved and suspended organic matter, and dissolved inorganic solids are major pollutants in Kraft processing wastewater. Current federal regulations limit the amount of solids and organic matter that a Kraft facility may dispose into public waters, so most plants have some form of wastewater treatment
In this study, the capacity of a continuous-flow, foam separation system to effect removals of color from a Kraft process wastewater was evaluated. The cationic surfactant, EHDABr, was used to precipitate color bodies in the wastewater and create a foam to carry the precipitates from the wastewater. The effect of pH adjustment was also considered. Color removals in the area of 90% were achieved
Removal of precipitated solids was enhanced by increasing the detention of wastewater in the treatment system. 相似文献