苯乙烯有机废水TOC与COD相关性研究

研究了苯乙烯生产有机废水总有机碳(TOC)与化学需氧量(COD)的相关性。用日本岛津公司TOC-VCPH总有机碳分析仪测定了苯乙烯生产有机废水的TOC,同时用标准重铬酸钾法测定COD,建立了COD与TOC之间回归方程,表明了它们之间有很好的相关性。并对其进行精密度和准确度分析,为该水体中有机物的TOC监测代替COD监测提供了实践依据。     

试论总有机碳分析在电厂化学监督中的重要性

总有机碳(TOC)分析是评价水体有机物污染程度的重要指标。介绍了TOC的主要来源,简述了TOC分析仪的检测过程及应用,并从不同角度论述了总有机碳(TOC)分析在电厂化学监督中的重要性。     

嘉兴市重点废水污染源中TOC和CODcr的相关性研究

一、概论 1．项目研究背景 CODcr是指在一定条件下,水中易被强氧化剂氧化的还原性物质所消耗的氧化剂的量,它是表示水体有机污染程度的指标。TOC表示水中总有机碳含量,是以碳量表示水体中有机物质总量的综合指标,所有含碳物质,包括苯、吡啶等芳香烃类有毒有害物质均能反映在TOC指标值中。     

提高水中总有机碳测定结果的准确度

总有机碳(TOC)是一个综合指标,通常作为评价水体有机污染程度的重要依据。本文使用德国Elementar vario TOC测定仪,采用燃烧氧化-非分散红外吸收法,使用差减法和直接法对标准样品和我厂不同水样进行测定,通过对比两方法,明确不同TIC和TOC水样的适用方法,并表明：石化厂高浓总排、延炼废水适合使用直接法,通过控制酸化曝气时间,提高了测定准确度,并对复杂水样使用差减法和直接法相结合测定,方法准确度满足要求。     

TOC-4100在污染源监控系统中的应用

我们的生活离不开水,若相当多的有机污染物存在于水中,将直接影响水体的质量,对我们的生活和生产造成危害,因此水和废水的监测,越来越引起人们的重视。其中水体中总有机碳（TOC）含量的检测,日益引起关注。它是以碳含量表示水体中有机物质总量的综合指标。TOC的测定一般采用燃烧法,此法能将水样中有机物全部氧化,可以很直接地用来表示有机物的总量。因而它被作为评价水体中有机物污染程度的一项重要参考指标。     

关于水体TOC与BOD、COD相关性的研究

在水体相对稳定的情况下,总有机碳TOC与生化需氧量BOD、化学需氧量COD之间存在一定的相关性,本文通过对生活污水测定相关数据,进行TOC与COD、TOC与BOD的相关性分析,从而推广使用TOC自动监测仪反映水体变化,对TOC环境标准的制定提供参考。     

TOC方法测量重水中有机碳方法研究

使用依据总有机碳谱仪能够快速准确地测量重水中的无机碳(IC)和总碳(TC),总有机碳(TOC)=总碳(TC)-无机碳(IC)可计算出重水中有机碳含量.该方法线性系数能达到0.999,回收率也能达到102.7％ ～116.0％,仪器检出限分别是:无机碳0.27μg/L和总碳0.53μg/L,能够满足重水中有机碳含量分析要...     

超临界水氧化法用于水质总有机碳含量检测

利用超临界水氧化法(SCWO)与非色散红外法(NDIR)相结合对葡萄糖水溶液总有机碳(TOC)含量进行连续检测.在超临界水氧化条件下,测试水样中初始有机物的浓度与红外检测信号具有良好的线性关系,表明此方法用于检测TOC含量切实可行.并研究了温度、压力、氧化剂浓度对检测结果的影响.实验结果表明,升高温度和压力均有利于提高...     

石油化工废水的总有机碳测定

前言随看我国石油化学工业的迅速发展,石油化工废水的数量日益增多。过去,对这种废水水质变化是用经典的五天生物耗氧量(BOD_6)和化学耗氧量(COD)来进行评价,这两种检测方法都有它的局限性。为了适应废水处理工艺的不断发展,对这种含毒成分复杂多变的废水,需要一种快速而准确地测定水中总有机碳(TOC)的方法。经典的测定水溶液中有机碳多采用湿式氧化法,但此法氧化不够完全,灵敏度低,测定时间也长。国外目前巳有定型的总有机碳(TOC)分析仪,分析快速准确,受到重视。这种仪器先将废水中的有机碳在高温下催化氧化成二氧化碳,一种是使CO_2通过     

湿法氧化-非分散红外吸收测定水中总有机碳

总有机碳能够直接反应水体被有机物质污染的程度,使用Aurora 1030W型总有机碳分析仪,采用过硫酸盐湿法氧化-非分散红外吸收法测定水中总有机碳。通过绘制标准曲线、精密度试验、准确度试验、加标回收等一系列试验来验证该方法,并对实际水样进行了测定。结果表明,该方法标准曲线相关系数为0.9996,准确度高,重现性好,相对标准偏差为0.43%~3.1%,加标回收率为97.2%~105%,适合用于水中总有机碳的测定。     

TiO2光催化降解水中天然有机物富里酸的动力学模型

在天津地表水中天然有机物主要是富里酸,它是消毒副产物的主要前驱体,因此对于富里酸的控制非常重要.以粉末态TiO₂为催化剂,在光催化-超滤反应器中对水中天然有机物富里酸进行了光催化氧化研究,考察了富里酸氧化的主要影响因素,包括初始pH值、催化剂浓度、光强、添加剂浓度.结果表明：富里酸降解过程能够用一级反应动力学来表示;最佳的催化剂浓度为0.5 g•L^-1;在pH值减小、添加剂浓度和光强增大时有助于富里酸的去除.通过分析反应速率常数和影响因素之间的关系,得到富里酸光催化氧化总体动力学模型,试验值基本符合动力学模型.另外试验还表明该反应器可方便地实现有机物降解且具有较高的去除效率.     

Fenton试剂对垃圾渗滤液中腐殖质的氧化/混凝作用

采用Fenton试剂处理反渗透浓缩垃圾渗滤液,通过COD,TOC,UV254以及COD/TOC等表征手段考察氧化/混凝作用对COD和腐殖质去除效果的影响。结果表明,Fenton试剂对浓缩渗滤液中腐殖质去除（11.9 % ~ 89.5 %）高于总COD去除（9.6 % ~ 75.2 %）;渗滤液中腐殖质降解和COD去除具有较好的相关性。混凝作用（CODcoag,HScoag）受氧化作用（CODoxid,HSoxid）的影响并与之相反,氧化作用越大,混凝作用越小。(COD/TOC)oxid变化表明,在[H₂O₂]>80 mmol.L^-1,pH=2.0~4.0, [Fe ²⁺ ]=40~160 mmol.L^-1,反应时间2 h的实验条件下,渗滤液中有完全氧化过程发生,同时(COD/TOC)coag的变化说明经混凝作用去除的有机物氧化态高于其它实验区间。     

煤化工反渗透浓水的高效降解菌株筛选、鉴定及应用研究

一般煤化工废水经过多级氧化处理后,反渗透淡水回用、浓水经蒸发产生难处理的“危废”,有机物的存在对“危废”循环利用有显著制约作用。以煤化工反渗透浓水为底物（TOC为233.4 mg/L,TDS为50.9 g/L,BOD₅/COD仅为0.05）,从不同菌源中筛选得到9株高效耐盐菌,经16S rDNA测序表明,这些菌株属于假单胞菌属、芽孢杆菌属及嗜盐单胞菌属。将9株耐盐菌配制成复合耐盐菌剂连续式运行处理实际废水,有机物去除率可达30%,为进一步提高去除率,经臭氧氧化预处理,有机物去除率可提高至40%,达到国内外较先进水平。根据气质联用分析,臭氧氧化预处理会破坏废水中环状物质的结构,提高复合耐盐菌剂对难降解有机物的去除效果。本研究为煤化工反渗透浓水中有机物的生物降解提供了可行性方案。     

Improvement of Biodegradability of Oil Field Drilling Wastewater Using Ozone

The possibility of improving the biodegradability of drilling wastewater using ozone was investigated following coagulation pretreatment. The biodegradability of wastewater was improved significantly following the start of ozonation, and the molecular weight of organic compounds decreased continuously with the progress of oxidation. It is interesting that minimum biochemical oxygen demand, total organic carbon (BOD/TOC) ratio (0.4 g/g) was observed when wastewater was treated with ozone continuously for 15 min. The combination of ozonation for 5 min (ozone consumption ratio of 2.6 g ozone/g TOC) followed by biological degradation produced a total TOC removal rate of 54.3%, which was comparable to direct ozonation for 30 min under the same conditions (TOC removal rate of 54.9%; ozone consumption ratio of 8.7 g ozone/g TOC). It is clear that biological treatment following short-term ozonation was very efficient in TOC removal. A process of successive coagulation-precipitation, ozone oxidation, and biodegradation seemed to be a good option for drilling wastewater treatment.     

Simultaneous Determination of Dissolved Organic Carbon and Total Dissolved Nitrogen on a Coupled High-Temperature Combustion Total Organic Carbon-Nitrogen Chemiluminescence Detection (HTC TOC-NCD) System

The marine biogeochemistries of carbon and nitrogen have come under increased scrutiny because of their close involvement in climate change and coastal eutrophication. Recent studies have shown that the high-temperature combustion (HTC) technique is suitable for routine analyses of dissolved organic matter due to its good oxidation efficiency, high sensitivity, and precision. In our laboratory, a coupled HTC TOC-NCD system with a sample changer was used for the automated and simultaneous determination of dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) in seawater samples. TOC control software was used for TOC instrument control, DOC data acquisition, and data analysis. TDN data acquisition and manipulation was undertaken under LabVIEW. The combined system allowed simultaneous determination of DOC and TDN in the same sample using a single injection and provided low detection limits and excellent linear ranges for both DOC and TDN. The risk of contamination has been remarkably reduced due to the minimal sample manipulation and automated analyses. The optimised system provided a reliable tool for the routine determination of DOC and TDN in marine waters.     

Photovoltaic solar electrochemical oxidation (PSEO) for treatment of lignosulfonate wastewater

BACKGROUND: Under the current global energy scenario, the need for self‐sustainable processes is encouraged. The photovoltaic solar powered electrochemical oxidation (PSEO) process has been developed to remove the organic matter from a lignosulfonate wastewater. RESULTS: An electrochemical reactor using boron‐doped diamond electrodes, in a batch configuration, is directly supplied with current from a set of photovoltaic solar modules. Experimental results show that the process can oxidize about 90% of the total organic carbon (TOC) of the organic matter in the wastewater under the described operating conditions. CONCLUSION: The technical suitability of the PSEO process has been demonstrated. A model to relate solar irradiance and electrical current was applied and used in a kinetic expression which depends on solar irradiance to describe the removal of TOC. Copyright © 2010 Society of Chemical Industry     

Heterogeneous Catalytic Ozonation with Supported Titanium Dioxide in Model and Natural Waters

This paper presents the results obtained with heterogeneous catalytic ozonation in which model and natural waters are ozonated in the presence of supported titanium dioxide (TiC₂) as a solid catalyst. The conditions in preparing the supported catalyst are experimentally optimized. The efficiencies of three catalyst supports (attapulgyte, alumina and silica gel) for organic matter oxidation have been compared. The TiC₂ supported in alumina calcined at 500[ddot]C compacted to granular form with a particle diameter about 2-4 mm is demonstrated to be the best catalyst on the removal total organic carbon (TOC) by ozone.     

接触氧化沉淀-超滤-纳滤处理引黄水库水中试

开展了生物接触氧化沉淀-超滤-纳滤组合工艺处理引黄水库水的中试,考察组合工艺连续稳定运行条件下除污染效能。结果表明,组合工艺对常规污染物、特征污染物均有良好的去除效果,浊度、TOC、UV254和CODMn等常规污染物去除率分别为95%、90%、90%和85%;总硬度、总碱度、溶解性总固体的去除率分别达到了97%,86%和91%,总脱盐率在95%以上;色氨酸、酪氨酸、SMPs、富里酸、类腐殖酸等荧光类有机物及消毒副产物前质消减率达到了88%和50%以上。组合工艺的除污染效能主要集中在纳滤单元,生物接触氧化沉淀和超滤单元对原水浊度和大分子有机物具有一定的去除效果,能为后续工艺减轻操作压力。定期对超滤、纳滤膜进行清洗可有效恢复工艺各项参数,延长膜工艺使用寿命。     

Fenton氧化法处理填埋渗滤液

Central composite design (CCD), the most popular design of response surface methodology (RSM), was employed to investigate the effect of total organic carbon (TOC) ratio of high molecular weight organic matter (HMW) to low molecular weight organic matter (LMW), the LMW strength and molar ratio of hydrogen peroxide to ferrous ion on landfill leachate treatment by Fention process. Based on the experimental data, a response surface quadratic model in terms of actual factors was obtained through analysis of variance (ANOVA). The model showed that TOC removal increased with the increase of HMW to LMW ratio and the decrease of LMW strength. There existed an optimal hydrogen peroxide to ferrous ion molar ratio for TOC removal.     

太原一电厂#15机组炉水中总有机碳控制探讨

通过对太原一电厂#15机组炉水中总有机碳（TOC）和离子成分检测、分析和试验研究,找到了水质异常的原因,同时确定了因TOC而引起水质异常应采取的措施和策略.