共查询到19条相似文献，搜索用时 593 毫秒
1.
草海沉积物有机质空间分布与来源识别 总被引：1，自引：0，他引：1
《绵阳师范学院学报》2017,(8):1-9
本文选取草海湿地这一典型高原湖泊湿地作为研究对象,分析了17个表层沉积物和3根代表性湖区沉积物柱芯总有机碳(TOC)含量、有机碳δ(13)C及C/N值,探讨了草海湿地表层沉积物和三个重点湖区不同深度沉积物有机质的主要来源,并利用有机碳δ(13)C及C/N值,探讨了草海湿地表层沉积物和三个重点湖区不同深度沉积物有机质的主要来源,并利用有机碳δ(13)C和C/N值对表层沉积物有机碳来源进行定量分析.结果表明:草海表层沉积物中TOC含量、δ(13)C和C/N值对表层沉积物有机碳来源进行定量分析.结果表明:草海表层沉积物中TOC含量、δ(13)C和C/N值变化范围分别为6.86%(13)C和C/N值变化范围分别为6.86%34.85%,-28.49%34.85%,-28.49%-18.19%,7.36-18.19%,7.3611.12;表层沉积物有机碳主要来源于藻类生产和沉水植物,沉水植物贡献率为49.7%,藻类初级生产的贡献率为48.8%,而陆源输入只对东部湖区有较小影响;东部湖区上部沉积物有机碳主要来源于藻类,底部受到藻类生长、陆源输入及沉水植物共同影响,湖心沉积物有机碳主要来源于藻 相似文献
2.
陈昀 《南通职业大学学报》2015,(2)
针对毒死蜱缩合工艺过程的生产废水,采用重铬酸钾法测定其化学需氧量（COD）,采用燃烧氧化—非色散红外吸收法测量总有机碳TOC含量,并分析其相关性和ρ（COD）/ρ（TOC）值。结果表明,对于稳定水质的废水,COD与TOC有显著的相关性,但不同性质的废水,ρ（COD）/ρ（TOC）值差异很大;其值波动的主要原因是废水中有机成分的组成不同、存在还原性的非有机物及COD测定中氧化率不同。 相似文献
3.
水环境在线监测总有机碳(TOC)与化学需氧量(COD)之间相关性探讨 总被引：1，自引：0，他引：1
通过对地表水总有机碳(TOC)与化学需氧量(COD)之间关系分析,并结合水质在线监测实际监测数据统计资料分析,对理论与实际监测结果比较分析,结果表明水质中总有机碳(TOC)与化学需氧量(COD)之间既存在着线性关系,又受地表水受纳水质的不确定性影响,使水质监测中的TOC与COD之间的相关性存在着一定的不确定性. 相似文献
4.
本文研究用美国Rosemount DC—85A有机总碳测定仪测定石油炼制废水中TOC与COD是否有相关性,二者具有良好的相关性.在一定条件下可以从测得的TOC值推算出COD值,因而可以用TOC值作为有机废水污染的控制指标. 相似文献
5.
FeAPO-11分子筛催化氧化水溶液中苯酚的性能 总被引：1，自引：0，他引：1
以水热晶化法合成了铁磷铝分子筛FeAPO-11,并用X射线衍射分析(XRD)、扫描电镜(SEM)、紫外-可见光漫反射(UV-Vis)等对样品进行了表征,结果表明,所合成的FeAPO-11分子筛样品结晶度高,且Fe3 进入到了分子筛骨架中.进而研究了以FeAPO-11为催化剂,H2O2为氧化剂对水溶液中苯酚的催化氧化性能:在苯酚初始浓度质量200 mg/L、H2O2添加量1200 mg/L、pH值5.0、处理温度60℃、处理时间240min时,苯酚去除率达到88.72%,总有机碳(TOC)去除率达52.5%,析出到溶液中的Fe3 浓度为0.213 mg/L.重复性实验表明,催化剂的稳定性较好. 相似文献
6.
遵循沉积岩中总有机碳测定标准(GB/T 19145—2003)的基础上,对前人在测定有机碳过程中酸处理法中的磨样粒径、酸处理浓度及时间等实验条件进行了改进,做到可批量预处理完样品的时间由原来的36 h以上缩短为22 h左右(不计磨样时间)。对改进的酸处理法的步骤进行了描述,如溶样的步骤、洗样的方式等。最后,用改进后的酸处理法与国家标准中的酸处理法(GB/T 19145—2003)分别预处理样品,其测定的总有机碳(TOC)值符合国家标准的重复性要求,且样本间的差异由抽样误差所致的概率P0. 05,两种方法的测定结果无显著性差异。 相似文献
7.
改良了一种针对浑浊易沉淀液体的总有机碳(TOC)检测方法(固体NPOC法),并验证了该方法的可靠性与准确性,优化了该方法中样品的预处理过程,通过实际样品进一步验证了该方法检测浑浊易沉淀液体样品TOC的准确性。结果表明:此方法与标准液体的NPOC法均可用于可溶性葡萄糖溶液的TOC测定,其准确度无显著性差异(P0.05);但测定浑浊易沉淀的不溶性淀粉标准溶液时,液体NPOC法所测定的值明显小于标准值和固体NPOC法的测定结果,且淀粉浓度越大,差异越明显;对样品进行盐酸酸化,其pH值低于4即可,总进样体积以200μL或300μL为佳。 相似文献
8.
提出了一种用丁二酮肟修饰玻碳电极,以差分脉冲溶出伏安法测定水中痕量铅离子的方法.在实验过程中,对各种实验参数如电解质种类及酸度、丁二酮肟用量、富集电位和时间、扫描速度等进行一定的优化.在pH=5.6的HAc-NaAc缓冲溶液中,铅离子与丁二酮肟生成螯合物富集在电极表面,然后在-0.8V被还原成零价的铅,在向阳极电位扫描的过程中,还原的铅被氧化而从电极表面溶出,于-0.60V形成阳极溶出峰,且峰电流与待测物浓度成正比,据此溶出峰电流可定量测定痕量铅离子.实验测得铅的线性范围为1×10-7 mol/L至5×10-5 mol/L,检测限为1×10-9 mol/L.在同一含量的体系中平行测定6次1×10-7 mol/L Pb2+的溶液,其标准偏差为2.9%.用丁二酮肟修饰玻碳电极测定水样中的铅离子,取得满意结果. 相似文献
9.
《绵阳师范学院学报》2015,(11):39-44
本文选取安昌河绵阳段6个断面,研究其水体中总有机碳(TOC)、化学需氧量(CODCr)、生化需氧量(BOD5)和溶解氧(DO)之间的内在联系与相关性.结果表明TOC与CODCr、BOD呈线性相关性,其中CODCr=2.406TOC-34.186,r=0.78,在BOD5和TOC相关性分析中,将各采样点的BOD5和TOC值进行一元线性回归可得出0.786相似文献
10.
采用物化法"碱处理-加絮凝剂-吸附-脱色"组合试验工艺,对COD大于36000(O2,mg/L)的抗生素工业有机废水进行了处理,排放水PH=7-9.COD为386.9(O2,mg/L),去除率达95%以上. 相似文献
11.
A treatability study of industrial wastewater containing chlorinated nitroaromatic compounds (CNACs) by a catalytic ozonation process (COP) with a modified Mn/Co ceramic catalyst and an aerobic sequencing batch reactor (SBR) was investigated.A preliminary attempt to treat the diluted wastewater with a single SBR resulted in ineffective removal of the color,ammonia,total organic carbon (TOC) and chemical oxygen demand (COD).Next,COP was applied as a pretreatment in order to obtain a bio-compatible wastewater for SBR treatment in a second step.The effectiveness of the COP pretreatment was assessed by evaluating wastewater biodegradability enhancement (the ratio of biology oxygen demand after 5 d (BOD5) to COD),as well as monitoring the evolution of TOC,carbon oxidation state (COS),average oxidation state (AOS),color,and major pollutant concentrations with reaction time.In the COP,the catalyst preserved its catalytic properties even after 70 reuse cycles,exhibiting good durability and stability.The performance of SBR to treat COP effluent was also examined.At an organic loading rate of 2.0 kg COD/(m3·d),with hydraulic retention time (HRT)=10 h and temperature (30±2) °C,the average removal efficiencies of NH3-N,COD,BOD5,TOC,and color in a coupled COP/SBR process were about 80%,95.8%,93.8%,97.6% and 99.3%,respectively,with average effluent concentrations of 10 mg/L,128 mg/L,27.5 mg/L,25.0 mg/L,and 20 multiples,respectively,which were all consistent with the national standards for secondary discharge of industrial wastewater into a public sewerage system (GB 8978-1996).The results indicated that the coupling of COP with a biological process was proved to be a technically and economically effective method for treating industrial wastewater containing recalcitrant CNACs. 相似文献
12.
This study investigated the removal and transformation of organic matter through laboratory-scale soil-aquifer treatment (SAT) soil columns over a 110-day period. Reductions in total organic carbon (TOC), dissolved organic carbon (DOC), biodegradable dissolved organic carbon (BDOC), nonbiodegradable dissolved organic carbon (NBDOC) and absorbance of ul-traviolet light at 254 nm (UV-254) averaged 71.46%, 68.05%, 99.31%, 33.27% and 38.96% across the soil columns, respectively. DOC/TOC ratios increased slightly with depth while BDOC/DOC ratios showed a converse trend. DOC exiting the soil-column system contained only a very small biodegradable fraction. SAT decreased the concentration of DOC present in feed water but increased its aromaticity, as indicated by specific ultraviolet light absorbance (SUVA), which increased by 50%～115% across the soil columns, indicating preferential removal of non-aromatic DOC during SAT. Overall, laboratory-scale SAT reduced triha-lomethane formation potential (THMFP), although specific THMFP increased. THMFP reduction was dominated by removal in chloroform. All samples exhibited a common general relationship with respect to weight: chloroform>dichlorobromomethane >dibromochloromethane>bromoform. 相似文献
13.
臭氧电晕协同处理有机实验室废水的研究 总被引：1，自引：0，他引：1
用高压电晕和臭氧联用的方法来处理有机实验室产生的高浓度废水。在最佳实验条件的基础上对高浓度苯胺废水进行处理。当降解时间为60 min时,质量浓度为500 mg/L的苯胺废水CODcr和TOC的去除率分别可达70.1%和63.2%,且处理后废水的可生化性也得到了较大的提高。因此,电晕和臭氧联用也可作为一般废水处理的前处理工艺。 相似文献
14.
The present drinking water purification system in Egypt Uses surface water as a raw water supply without a pre-liminary filtration process.On the other hand,chlorine gas iS added as a disinfectant agent in two steps,pre- and post.chlorination.Due to these reasons most of water treatment plants suffer low fltering effectiveness and produce the trihalomethane (THM) species as a chlorination by-product.The Ismailia Canal represents the most distal downstream of the main Nile Rivet.ThUS its water contains all the proceeded pollutants discharged into the Nile.In addition.the downstream reaches of the canal act as an agricultural drain during the closing period of the High Dam gates in January and February every year.Moreover,the wide in-dustrial zone along the upstream course of the carlal enriches the canal water with high concentrations of heavy metals.The obtained results indicate that the canal gains up to 24.06×106m3 of water from the surrounding shallow aquifer during the closing period ofthe High Dam gates,while during the rest ofthe year,the callal acts as an influent stream losing about 99.6×106m3 of its water budget.The reduction oftotaI organic carbon(TOC) and suspended particulate mattes(SPMs)should be one of the central goals of any treatment plan to avoid the disinfectants by-products.The combination of sedimentation basins.gravel pre-filtration and slow sand filtration,and underground passage with microbiological oxidation-reduction and adsorption criteria showed good removal of parasites and bacteria and complete elimination of TOC.SPM and heavy metals.Moreover,it reduces the use of disinfectants chemicals and lowers the treatment costs.However,this purification system under the arid climate prevailing in Egypt should be tested and modified prior to application. 相似文献
15.
李小如 《广东轻工职业技术学院学报》2006,5(2):14-15,27
对广州市区主要河涌TOC值与CODcr值进行了相关性研究,结果表明河涌水中TOC值与CODcr值之间有着良好的相关性。同时根据监测结果对河涌有机污染的状况进行了进一步的分析。 相似文献
16.
活性炭优良的吸附性能使其在废水处理中得以广泛应用.详细阐述了活性炭吸附在含铬废水、含氰废水,含酚废水等多种废水中的应用研究,并介绍了改性活性炭,活性炭纤维和活性炭与其他水处理技术的联用. 相似文献
17.
本实验研究了以不锈钢片单独做阳极和以活性碳纤维毡片（＋不锈钢）的复合阳极对TNT废水电解效果的影响,并对电解机理进行了初步的探讨。原废水的TNT浓度为70—90mg／L,COD约为290—340mg／L,PH为7．5—9。实验数据显示,当槽电压为10V,PH值为3,外加电解质Na2SO4lg／L,极板间距为4era,电流密度为15mA／em。,搅拌转速为260r／min,电解2h时,以活性碳纤维＋不锈钢复合材料为阳极处理原废水,对TNT和COD的降解率分别为66．6％和55．5％,然而单独以不锈钢材料为阳极情况下,对TNT和COD的降解率仅为43．5％和24．7％。结果表明以活性碳纤维＋不锈钢复合材料为阳极对TNT废水中的有机物的电解效果显著,对实际工程废水处理有一定的指导意义。 相似文献
18.
张景环 《河北职业技术师范学院学报》2014,(3):64-69
通过375℃热氧化方法,对松辽流域6种沉积物中的黑炭进行了分离定量,并研究了沉积物和黑炭对萘的吸附行为。结果表明,沉积物中黑炭占总有机碳的质量分数为0.091 3-0.374 0,平均值为0.205 0。所有沉积物和黑炭样品对萘均表现为非线性吸附,Freundlich模型对吸附数据的拟合效果很好。与原始沉积物相比,黑炭对萘的吸附非线性更强,n值为0.629-0.827,说明黑炭比沉积物具有更多的非均质性的吸附位。在给定浓度Ce下,黑炭的吸附能力参数Koc值较沉积物样品高,表明黑炭对萘的吸附能力更强。萘的Kf值与沉积物有机碳含量存在很好的正相关关系（R2=0.990,p〈0.001）,揭示了沉积物有机碳含量在萘吸附能力中的重要性。本研究为预测多环芳烃在环境中的分布特征和最终归趋提供了理论依据。 相似文献
19.
The effects of the concentration of dissolved total organic carbon(TOC),the TOC/Br-ratio,bromide ion levels,the chlorine to ammonia-N ratio(Cl:N),the monochloramine dose and the chlorine dose on the formation of trihalomethanes(THMs)(including chloroform,bromodichloromethane,chlorodibromomethane,and bromoform)from chlorination were investigated using aqueous humic acid(HA)solutions.The profile of the chloramine decay was also studied under various bromide ion concentrations.Monochloramine decayed in the presence of organic material and bromide ions.The percentage of chloroform and brominated THMs varied according to the TOC/Br-ratio.Total THMs(TTHMs)formation increased from 112 to 190 μg/L with the increase concentrations of bromide ions from 0.67 to 6.72 mg/L,but the chlorine-substituted THMs were replaced by bromine-substituted THMs.A strong linear correlation was obtained between the monochloramine dose and the formation of THMs for Cl:N ratios of 3:1 and 5:1.These ratios had a distinct effect on the formation of chloroform but had little impact on the formation of bromodichloromethane or chlorodibromomethane.The presence of bromide ions increased the rate of monochloramine decay. 相似文献