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1.
A novel fluidized electrochemical reactor that integrated advanced electrochemical oxidation with activated carbon (AC) fluidization in a single cell was developed to model pollutant p-nitrophenol (PNP) abatement. AC fluidization could enhance COD removal by 22%-30%. In such a combined process, synergetic effects on PNP and COD removal was found, with their removal rate being enhanced by 137.8% and 97.8%, respectively. AC could be electrochemically regen erated and reused, indicating the combined process would be promising for treatment of biorefractory organic pollutants. 相似文献
2.
A novel fluidized electrochemical reactor that integrated advanced electrochemical oxidation with activated carbon (AC) fluidization
in a single cell was developed to model pollutant p-nitrophenol (PNP) abatement. AC fluidization could enhance COD removal by 22%–30%. In such a combined process, synergetic
effects on PNP and COD removal was found, with their removal rate being enhanced by 137.8% and 97.8%, respectively. AC could
be electrochemically regenerated and reused, indicating the combined process would be promising for treatment of biorefractory
organic pollutants.
Project (No. 20306027) supported by the National Natural Science Foundation of China 相似文献
3.
以半导体材料二氧化钛为催化剂,对偶氮染料甲基橙溶液进行了电催化氧化降解实验;考察了催化剂量、槽电压、pH值、电解质浓度、反应时间等因素对处理效果的影响.实验结果表明:二氧化钛的催化效果显著,其色度和COD去除效果可比无催化剂时效果分别提高35%和28%;去除机制主要是电催化体系中产生的·OH对有机物的氧化、降解. 相似文献
4.
It is difficult to treat 2-amino-thiazoline- 4-carboxylic acid (ATC) waste liquid effectively at present for its characteristics of high chemical oxygen demand (COD), high salinity and low biodegradability. In order to solve this problem, this paper presents several kinds of physical-chemical treatment unit techniques, including acid separation, catalytic oxidation and coagulation. First of all, acid separation was adopted to precipitate relevant organics at isoelectric point. When the temperature and pH value of acid separation were controlled at about 5 ℃ and 2.2 respectively, the COD removal rate could reach 27.6%. Secondly, oxidation was used to break chemical constitution of refractory organics. The optimal reaction parameters of catalytic oxidation should be 20 ℃, pH adjusted to 5.0 and [Fe^2 ] 300 mg/L. Then with 5% H2O2 added and after one-hour reaction, the COD removal rate could achieve about 52%. Finally, coagulation was adopted to remove a portion of refractory organics, and 15% polymeric molysite flocculant was the best for the coagulation, and the COD removal rate could reach about 15%. Therefore, the proposed feasible process of physicalchemical pretreatment for ATC waste liquid could have about 70% COD removed in total. 相似文献
5.
INTRODUCTIONInordertogetpliableandelegantterylenefabricjustlikesilk,terylenegreigeclothisalwayspretreatedwithalkali-decompositionprocesswh-ereinterylenegreigeclothishydrolyzedtosomeextentinNaOHsolutionatcertaintemperature(T)andpressure.Duringthisprocess,thesuperficialterylenefibreispeeledofffromtheclothanddis-solvedintosolution,inwhichteryleneacid(TA)andethyleneglycolaredischargedaspollutantsinwastewater.Theobtainedterylenefabricwithsi-lkenwrinkleandsoftfeelingiscalledartificialsilkfabr… 相似文献
6.
Aerobically activated sludge processing was carried out to treat terylene artificial silk printing and dyeing wastewater (TPD wastewater) in a lab-scale experiment, focusing on the kinetics of the COD removal. The kinetics parameters determined from experiment were applied to evaluate the biological treatability of wastewater. Experiments showed that COD removal could be divided into two stages, in which the ratio BOD/COD (B/C) was the key factor for stage division. At the rapid-removal stage with B/C>0.1, COD removal could be described by a zero order reaction. At the moderate-removal stage with B/C<0.1, COD removal could be described by a first order reaction. Then Monod equation was introduced to indicate COD removal. The reaction rate constant (K) and half saturation constant (KS) were 0.0208-0.0642 L/(gMLSS)·h and 0.44-0.59 (gCOD)/L respectively at 20 ℃-35 ℃. Activation energy (Ea) was 6.05×104 J/mol. By comparison of kinetic parameters, the biological treatability of TPD wastewater was superior to that of traditional textile wastewater. But COD removal from TPD-wastewater was much more difficult than that from domestic and industrial wastewater, such as papermaking, beer, phenol wastewater, etc. The expected effluent quality strongly related to un-biodegradable COD and kinetics rather than total COD. The results provide useful basis for further scaling up and efficient operation of TPD wastewater treatment. 相似文献
7.
This paper describes the removel of COD and nitrogen from wastewater with modified sequencing batch biofilm reactor,The strategy of simultaneous feeding and draining was explored.The results show that introduction of a new batch of wastewater and withdrawal of the purifeid water can be conducted simultaneously with the maximum volumetric exchange rate of about 70%,Application of this feeding and draining mode leads to the reduction of the cycle time,the increase of the utilization of the reactor volume and the simplification of the reactor structure.The treatment of a synthetic wastewater containing COD and nitrogen was investigated.The operation mode of F(D)-O(i.e.,simultaneous feeding and draining followed by the aerobic condition)was adopted.It was found that COD was degraded very fast in the initial reaction period of time,then reduced slowly and the ammonia nitrogen and nitrate nitrogen concentrations decreased and increased with time respectively,while the nitrite nitrogen level increased first and then reduced.The relationship between the COD or ammonia nitrogen loading and its removal rate was examined,and the removal of COD,ammonia nitrogen and total nitrogen could exceed 95%,90%and 80% respectively,The fact that nitrogen could e removed more completely under constant aeration(aerobic condition)of the SBBR operation mode is very interesting and could be explained in several respects. 相似文献
8.
INTRODUCTION Chlorinated phenols compounds used widely in industry were intentionally or inadvertently released into environment in large quantities. These chlorin-ated aromatic compounds have strong resistance to physical, chemical and biological treatments and have been listed as a priority pollutant by the U.S. Envi-ronmental Protection Agency (Lin and Tseng, 1999). Wastewater containing chlorophenols has malodor-ous odor, high toxicity, bioaccumulation and car-cinogenic potential. … 相似文献
9.
利用自制聚合硫酸铁处理高色度印染废水，研究了最佳实验条件。该方法工艺简单，药剂成本低，废水的COD去除率达70％以上，脱色率达98％以上，出水水质达到了国家印染废水排放二级标准。 相似文献
10.
用化学方法测定了偶氮苯最初的COD值,通过对电生成Fenton试剂对偶氮苯染料废水降解的动力学分析表明,偶氮苯的降解反应近似遵循一级反应动力学特征．在电生成Fenton试剂的过程中,有机物的去除率超过80％,有效降低了染料废水的浓度、色度和COD值． 相似文献
11.
朱蕾 《渭南师范学院学报》2014,29(19):34-38
在处理制革废水中常用SBR工艺,试验探讨了不同HRT、进水pH、COD负荷、NH3-N浓度、活性污泥浓度的运行参数,研究SBR工艺处理制革废水的最优运行参数．结果表明：SBR反应器在进水COD为1500～2000mg／L、NH3-N为150～250mg／L、pH为7．5、运行污泥浓度在3．0g／L左右、曝气时间为18h时COD去除率能达到95％左右,NH3-N去除率达到97％左右,其出水能够达到一级出水标准． 相似文献
12.
Experiments were conducted to study the role of micro-electrolysis in removing chromaticity and COD and improving the biodegradability
of pharmaceutical wastewater. The results showed that the use of micro-electrolysis technology could remove more than 90%
of chromaticity and more than 50% of COD and greatly improved the biodegradability of pharmaceutical wastewater. Lower initial
pH could be advantageous to the removal of chromaticity. A retention time of 30 minutes was recommended for the process design
of microelectrolysis. 相似文献
13.
Coagulation-flocculation process for combined sewage in Shanghai 总被引：1，自引：0，他引：1
黄天寅 《重庆大学学报(英文版)》2004,3(2):25-29
IntroductionaEutrophicationisaseriousprobleminYangtzeestuarybecausesomuchuntreatedcombinedwastewaterisdischargedintotherivereveryday.Thecombinedsewagecontainsorganicsandnutrients.Coagulation-flocculationprocesscanachieveahighefficiencyinremovingorganicsubstancesandphosphates,andcanbeaneconomicalalternativetoafullbiologicaltreat-mentprocess[1].Theaimofapplyingcoagulation-flocculationtreatmentisgenerallytoremovecolloidalmatterinwastewater.Also,nutrientsmayberemovedduringtheprocess.Thephysical-… 相似文献
14.
卓雄 《福建工程学院学报》2021,(4):365-371
老龄化垃圾渗滤液氨氮(NH3 -N)浓度极高,可生化性差,处理难度大。本研究采用物理化学和生物工艺相结合的方法处理老龄化垃圾渗滤液,动力波吹脱法去除NH3 -N,Fenton氧化法去除生物难降解化合物,A/O型SBR法去除生物可降解成分,创新性地提出了一种动力波吹脱-Fenton-SBR 组合工艺。通过对实验条件的正交分析,确定了最佳的实验参数。结果表明,经动力波吹脱-Fenton-SBR组合工艺处理处理后的垃圾渗滤液,其出水COD 和NH3 -N的去除率最高可达96.67%和97.98%。相比现有的诸多工程实例,本研究提出的组合工艺处理成本低至45.95 元/ t,处理效果更好,成本更低。 相似文献
15.
研制了一种用于生活污水处理的一体式颗粒活性炭-动态膜生物反应器(GAC-DMBR)工艺,考察了GAC-DMBR和DMBR工艺对模拟生活污水进行处理的出水COD、氨氮、硝氮、总氮的浓度。结果表明,DM-BR对COD和总氮的去除率分别为85%以上和50%,而GAC-DMBR对氨氮的去除率为76.7%,优于普通DMBR,出水水质达到城市污水再生利用的标准——城市杂用水水质标准(GB/T18920-2002),可回用于冲厕、车辆冲洗等。建立一体式GAC-DMBR处理污水工艺,为学生掌握污水处理技术提供了坚实的实验基础,并对环境保护具有重要的意义。 相似文献
16.
设计了膜生物反应器 (MBR)与粉末活性炭 (PAC)联合使用的膜组合工艺 (PAC MBR)处理微污染地表水 ,并用分子量分析方法来考察PAC MBR组合工艺及各单元工艺对有机物的去除效果 .分析结果表明 ,由于原水中的小分子有机物难生物降解 ,该工艺出水有机物集中在小于 1k的分子量区间内 ,活性炭的投加能显著提高这部分有机物的去除率 .试验证明 ,PAC MBR工艺中生物处理与活性炭吸附互相促进 ,在稳定运行阶段对CODMn、UV2 54 、UV4 10 和氨氮的去除率分别达到 70 %、70 %、10 0 %和 92 % . 相似文献
17.
任百祥 《河北职业技术学院学报》2014,(2):55-58
采用纳米TiO2为催化剂,超声辐照为主要手段对实际印染工业废水进行了降解实验研究,考察了各种反应参数对印染废水降解效果的影响。结果表明,纳米TiO2对印染工业废水的超声降解效果具有明显的辅助和提高。当超声波频率为45kHz,功率为200W,溶液初始pH值为2.63,超声反应时间为150min的条件下,印染工业废水的COD去除率为73%,而同样条件下,投加750mg/L纳米TiO2,其超声降解废水COD去除率可达90.2%。 相似文献
18.
本文提出了一种治理造纸黑液的新方法─—电解催化氧化法、并讨论了影响ＣＯＤ去除率的各种因素。在最佳反应条件下，采用电解催化氧化法，ＣＯＤ的去除率可达９０．３％，出水接近国家排放标准。 相似文献
19.
An expanded granular sludge bed (EGSB) reactor inoculated with anaerobic granular sludge was started up with its COD removal performance, self-balancing of pH, biogas production rate and characteristics of the granular sludge during the start-up period being investigated. The results indicated that the EGSB reactor can be started up successfully in 27 d by increasing the organic loading rate rapidly. The removal efficiency of COD was maintained above 93% with influent COD concentration of 25 000 mg/L and OL... 相似文献
20.
Phenol degradation in photochemically enhanced Fenton process was investigated in this work. UV-VIS spectra of phenol degradation showed the difference between photo-Fenton process and UV/H2O2, which is a typical hydroxyl radical process. A possible pathway diagram for phenol degradation in photo-Fenton process was proposed, and a mathematical model for chemical oxygen demand (COD) removal was developed. Operating parameters such as dosage of H2O2 and ferrous ions, pH, suitable carrier gas were found to impact the removal of COD significantly. The results and analysis of kinetic parameters calculated from the kinetic model showed that complex degradation of phenol was the main pathway for removal of COD; while hydroxyl radicals acted weakly in the photo-Fenton degradation of phenol. 相似文献