D301树脂对三原色派拉丁染料的吸附

采用D301树脂对经絮凝工艺处理后的三种模拟派拉丁印染废水中的三原色染料进行吸附.实验结果表明:在D301树脂的粒径为425～600 μm、模拟印染废水pH为2、反应温度为30℃、D301树脂加入量为3 g/L、派拉丁粉红BN、派拉丁蓝RR和派拉丁黄GR三种模拟印染废水的初始质量浓度分别为207.98,315.00,6...     

内电解法处理偶氮染料废水

采用内电解法处理偶氮染料废水。正交实验结果表明,铸铁铁屑加入量对废水脱色率的影响最大,其次是酸性反应pH,再次是碱性反应pH,最后是碱性反应时间。最佳处理工艺条件为：铸铁铁屑加入量10g,酸性反应pH2．0,碱性反应pH7．0,碱性反应时间10min。此条件下脱色率达98．89％。铸铁铁屑使用6次后对废水的脱色率明显下降,将使用6次后的铸铁铁屑活化,活化后废水脱色率由86．80％提高至93．83％。     

On the performance of Fe and Fe,F doped Ti-Pt/PbO2 electrodes in the electrooxidation of the Blue Reactive 19 dye in simulated textile wastewater

The electrochemical performance of pure Ti–Pt/β-PbO₂ electrodes, or doped with Fe and F (together or separately), in the oxidation of simulated wastewaters containing the Blue Reactive 19 dye (BR-19), using a filter-press reactor, was investigated and then compared with that of a boron-doped diamond electrode supported on a niobium substrate (Nb/BDD). The electrooxidation of the dye simulated wastewater (volume of 0.1 l, with a BR-19 initial concentration of 25 mg l⁻¹) was carried out under the following conditions: current density of 50 mA cm⁻², volume flow rate of 2.4 l h⁻¹, temperature of 25 °C and electrode area of 5 cm². The performances of the electrodes in the dye decolorization were quite similar, achieving 100% decolorization, and in some cases 90% decolorization was achieved by applying only ca. 0.3 A h l⁻¹ (8 min of electrolysis). The reduction of the simulated wastewater organic load, monitored by its total organic carbon content (TOC), was greater for the Ti–Pt/β-PbO₂–Fe,F electrode obtained from an electrodeposition bath containing 1 mM Fe³⁺ and 30 mM F⁻. In this case, after 2 h of electrolysis the obtained TOC reduction was 95%, while for the pure β-PbO₂ and the Nb/BDD electrodes the reductions were 84% and 82%, respectively.     

微波无极紫外光氧化-内电解工艺处理染料废水研究

在自制的微波激发无极紫外灯光氧化反应器和内电解反应器联用体系中,以次氯酸钠为氧化剂,对活性深兰M-2GE染料模拟废水进行处理.结果表明,投加次氯酸钠4 mL/L、微波紫外光反应时间30 min、内电解反应时间50 min时,活性深兰M-2GE染料模拟废水的脱色率、COD去除率可分别达到95%、70%的处理效果.     

活性艳蓝KN-R在ACF电极上成对电解脱色的影响因素

分别以活性炭纤维(ACF)为阳极和阴极,在无隔膜电解槽中研究了利用成对电解降解蒽醌染料活性艳蓝KN-R脱色过程的影响因素。考察了染料初始浓度、支持电解质Na₂SO₄、pH及温度诸条件对脱色性能的作用。结果表明：适当增加染料初始浓度和支持电解质浓度,酸性和中性条件以及适中的温度均对成对电解脱色性能有利。当染料初始浓度为251 mg/L,在合适的处理条件下,脱色率达到95%,脱除单位质量染料电耗仅为1.22 kWh/kg染料。     

固定化工程菌对偶氮染料脱色及强化作用

利用聚亚胺酯大孔泡沫吸附固定基因工程菌Escherichia coli JM109 (pGEX-AZR),研究其对偶氮染料的脱色动力学及生物强化作用.实验表明,固定的E.coli JM109(pGEX-AZR) 对酸性大红GR的脱色动力学符合Andrews方程,动力学常数为μ_max,c、K_c、K_ic分别为49 .2 mg·(g·h)^-1、710 .43 mg·L^-1和681 .62　mg·L^-1,R²为0 .995.将固定的E.coli JM109(pGEX-AZR)按10%的比例投加到厌氧序批式活性污泥反应器中连续运行32 d,含有固定化工程菌的强化体系耐浓度冲击的能力和脱色率均高于对照体系,脱色率可以稳定在90%以上.利用RISA对其微生物群落结构进行分析,E.coli JM109(pGEX-AZR)及降解酸性大红GR的优势菌群可以在污泥体系中稳定存在.     

活性染料K-2BP在环境水体中的光解效应

研究了活性染料K－2BP在TiO2存在下的光催化氧化分解。结果表明,影响光解过程的主要因素是染料浓度、催化剂TiO2的用量和pH。实验条件下,染料样液脱色率可达90％以上,将该法用于实际印染废水的处理,光照6h,脱色率可达70％以上。     

絮凝-光催化处理实际染料废水的研究

采用絮凝-光催化氧化工艺成功地处理了实际染料废水;研究了COD光催化降解动力学。COD和BOD5浓度分别为2169mg／L、295mg／L的染料废水,经絮凝-光催化处理后,出水COD和BOD5分别为214mg／L、18．5mg／L,去除率分别为90．1％、93．7％。向光催化体系中加入H2O2,可促进COD与BOD5的去除。该工艺可处理高浓度染料废水。     

偶氮染料生产废水的处理工艺技术研究

偶氮染料废水具有高COD_Cr、高色度、有机物成分复杂等特点。根据清污分流的原则,确定处理工艺方案为:首先对高浓度偶氮染料工艺废水采用中和—电解—臭氧氧化进行预处理后,再与低浓度废水按比例混合混凝处理。经大量工艺实验确定全流程工艺条件为:废水pH中性、电解电压10V、电流密度0.018A/cm2、电解时间2h,O₃氧化时间为2h,混凝剂环保1#和3#浓度各为250mg/L。COD_Cr、色度的去除率分别可以达到99.6%,99.9%。可以达标排放。      

TRANSIENT STORAGE ASSESSMENTS OF DYE‐TRACER INJECTIONS IN RIVERS OF THE WILLAMETTE BASIN,OREGON1

ABSTRACT: Rhodamine WT dye‐tracer injections in rivers of the Willamette Basin yield concentration‐time curves with characteristically long recession times suggestive of active transient storage processes. The scale of drainage areas contributing to the stream reaches studied in the Willamette Basin ranges from 10 to 12,000 km². A transient storage assessment of the tracer studies has been completed using the U.S. Geological Survey's One‐dimensional Transport with Inflow and Storage (OTIS) model, which incorporates storage exchange and decay functions along with the traditional dispersion and advection transport equation. The analysis estimates solute transport of the dye. It identifies first‐order decay coefficients to be on the order of 10^?5/sec for the nonconservative Rhodamine W.T. On an individual subreach basis, the first‐order decay is slower (typically by an order of magnitude) than the transient storage process, indicating that nonconservative tracers may be used to evaluate transient storage in rivers. In the transient storage analysis, a dimensionless parameter (A_s/A) expresses the spatial extent of storage zone area relative to stream cross section. In certain reaches of Willamette Basin pool‐and‐riffle, gravel‐bed rivers, this parameter was as large as 0.5. A measure of the storage exchange flux was calculated for each stream subreach in the simulation analysis. This storage exchange is shown subjectively to be higher at higher stream discharges. Hyporheic linkage between streams and subsurface flows is the probable physical mechanism contributing to a significant part of this inferred active transient storage. Hyporheic linkages are further suggested by detailed measurements of river discharge with an Acoustic Doppler Current Profiler system delineating zones in two large rivers where water alternately enters and leaves the surface channels through gravel‐and‐cobble riverbeds. Measurements show patterns of hyporheic exchange that are highly variable in time and space.