We investigated the decolorization of Orange Ⅱ with and without the addition of co-substrates and nutrients under an anaerobic sequencing batch reactor（ASBR）.The increase in COD concentrations from 900 to 1750 to 3...We investigated the decolorization of Orange Ⅱ with and without the addition of co-substrates and nutrients under an anaerobic sequencing batch reactor（ASBR）.The increase in COD concentrations from 900 to 1750 to 3730 mg/L in the system treating 100 mg/L of Orange Ⅱ-containing wastewater enhanced color removal from 27% to 81% to 89%,respectively.In the absence of co-substrates and nutrients,more than 95% of decolorization was achieved by the acclimatized anaerobic microbes in the bioreactor treating 600 mg/L of Orange Ⅱ.The decrease in mixed liquor suspended solids concentration by endogenous lysis of biomass preserved a high reducing environment in the ASBR,which was important for the reduction of the Orange Ⅱ azo bond that caused decolorization.The maximum decolorization rate in the ASBR was approximately 0.17 g/hr in the absence of co-substrates and nutrients.展开更多
Some problems including low treatment capacity,agglomeration and clogging phenomena,and short working life,limit the application of pre-treatment methods involving zero-valent iron （ZVI）.In this article,ZVI was froz...Some problems including low treatment capacity,agglomeration and clogging phenomena,and short working life,limit the application of pre-treatment methods involving zero-valent iron （ZVI）.In this article,ZVI was frozen in an amorphous state through a melt-spinning technique,and the decolorization effect of amorphous ZVI on Acid Orange II solution was investigated under varied conditions of experimental variables such as reaction temperature,ribbon dosage,and initial pH.Batch experiments suggested that the decolorization rate was enhanced with the increase of reaction temperature and ribbon dosage,but decreased with increasing initial solution pH.Kinetic analyses indicated that the decolorization process followed a first order exponential kinetic model,and the surface-normalized decolorization rate could reach 2.09 L/（m^2 ·min） at room temperature,which was about ten times larger than any previously reported under similar conditions.Recycling experiments also proved that the ribbons could be reused at least four times without obvious decay of decolorization rate and efficiency.This study suggests a tremendous application potential for amorphous ZVI in remediation of groundwater or wastewater contaminated with azo dyes.展开更多
为建立一种脱色评价的方法,以样品吸光度曲线的曲线下面积(area under the curve,AUC)作为脱色率计算依据,将AUC应用于枸杞多糖的脱色工艺考察中,探究枸杞多糖的最佳脱色工艺条件。采用紫外-可见分光光度计,在200~760 nm处对3种色素(原...为建立一种脱色评价的方法,以样品吸光度曲线的曲线下面积(area under the curve,AUC)作为脱色率计算依据,将AUC应用于枸杞多糖的脱色工艺考察中,探究枸杞多糖的最佳脱色工艺条件。采用紫外-可见分光光度计,在200~760 nm处对3种色素(原花青素、叶绿素铜钠、β-胡萝卜素)的溶液分别进行全波长扫描,采用Origin软件统计脱色前后样品液的AUC,用于计算脱色率。将AUC脱色计算方式引入到枸杞多糖的脱色工艺考察,筛选不同类型大孔树脂的脱色效果,并通过单因素与正交试验确定最佳脱色条件。结果表明:上述3种色素分别在0.98~31.25、3.92~125.00、0.39~12.50μg/mL范围内线性关系良好,R2≥0.998 6,平均加标回收率分别为101.86%、100.08%、100.68%,相对标准偏差(relative standard deviation,RSD)分别为2.66%、2.27%、2.55%。采用AUC脱色率计算方法,枸杞多糖粗品采用S8大孔树脂脱色,最佳脱色工艺条件为每100 mg多糖粗品使用S8树脂量为7.5 g、粗品浓度为3.0 g/L、在35℃下脱色时间为60 min。在该脱色工艺条件下,脱色率的平均值为73.01%,RSD为1.01%,说明稳定性良好。展开更多
In this paper,prepared are three kinds of SiO 2 TiO 2 photocatalyst containig zirconium.At pH=7,treated with commonlight source,decoloration rates of acid scarlet red 3R,direct fast black G and active scarlet red K 2G...In this paper,prepared are three kinds of SiO 2 TiO 2 photocatalyst containig zirconium.At pH=7,treated with commonlight source,decoloration rates of acid scarlet red 3R,direct fast black G and active scarlet red K 2G are more than 95%.展开更多
文摘We investigated the decolorization of Orange Ⅱ with and without the addition of co-substrates and nutrients under an anaerobic sequencing batch reactor（ASBR）.The increase in COD concentrations from 900 to 1750 to 3730 mg/L in the system treating 100 mg/L of Orange Ⅱ-containing wastewater enhanced color removal from 27% to 81% to 89%,respectively.In the absence of co-substrates and nutrients,more than 95% of decolorization was achieved by the acclimatized anaerobic microbes in the bioreactor treating 600 mg/L of Orange Ⅱ.The decrease in mixed liquor suspended solids concentration by endogenous lysis of biomass preserved a high reducing environment in the ASBR,which was important for the reduction of the Orange Ⅱ azo bond that caused decolorization.The maximum decolorization rate in the ASBR was approximately 0.17 g/hr in the absence of co-substrates and nutrients.
基金the financial support from the Ministry of Science and Technology of China(No. 2011CB606301)the National Natural Science Foundation of China (No. 50825402,51101156)
文摘Some problems including low treatment capacity,agglomeration and clogging phenomena,and short working life,limit the application of pre-treatment methods involving zero-valent iron （ZVI）.In this article,ZVI was frozen in an amorphous state through a melt-spinning technique,and the decolorization effect of amorphous ZVI on Acid Orange II solution was investigated under varied conditions of experimental variables such as reaction temperature,ribbon dosage,and initial pH.Batch experiments suggested that the decolorization rate was enhanced with the increase of reaction temperature and ribbon dosage,but decreased with increasing initial solution pH.Kinetic analyses indicated that the decolorization process followed a first order exponential kinetic model,and the surface-normalized decolorization rate could reach 2.09 L/（m^2 ·min） at room temperature,which was about ten times larger than any previously reported under similar conditions.Recycling experiments also proved that the ribbons could be reused at least four times without obvious decay of decolorization rate and efficiency.This study suggests a tremendous application potential for amorphous ZVI in remediation of groundwater or wastewater contaminated with azo dyes.
文摘为建立一种脱色评价的方法,以样品吸光度曲线的曲线下面积(area under the curve,AUC)作为脱色率计算依据,将AUC应用于枸杞多糖的脱色工艺考察中,探究枸杞多糖的最佳脱色工艺条件。采用紫外-可见分光光度计,在200~760 nm处对3种色素(原花青素、叶绿素铜钠、β-胡萝卜素)的溶液分别进行全波长扫描,采用Origin软件统计脱色前后样品液的AUC,用于计算脱色率。将AUC脱色计算方式引入到枸杞多糖的脱色工艺考察,筛选不同类型大孔树脂的脱色效果,并通过单因素与正交试验确定最佳脱色条件。结果表明:上述3种色素分别在0.98~31.25、3.92~125.00、0.39~12.50μg/mL范围内线性关系良好,R2≥0.998 6,平均加标回收率分别为101.86%、100.08%、100.68%,相对标准偏差(relative standard deviation,RSD)分别为2.66%、2.27%、2.55%。采用AUC脱色率计算方法,枸杞多糖粗品采用S8大孔树脂脱色,最佳脱色工艺条件为每100 mg多糖粗品使用S8树脂量为7.5 g、粗品浓度为3.0 g/L、在35℃下脱色时间为60 min。在该脱色工艺条件下,脱色率的平均值为73.01%,RSD为1.01%,说明稳定性良好。
文摘In this paper,prepared are three kinds of SiO 2 TiO 2 photocatalyst containig zirconium.At pH=7,treated with commonlight source,decoloration rates of acid scarlet red 3R,direct fast black G and active scarlet red K 2G are more than 95%.
