共查询到18条相似文献,搜索用时 15 毫秒
1.
《分离科学与技术》2012,47(3):470-481
The electrochemical oxidation of distillery effluent was studied in a batch reactor in the presence of supporting electrolyte NaCl using Mixed Metal Oxide (MMO) electrode. The effect of operating parameters such as current density, initial pH, and initial electrolyte concentration on the percentage of Chemical Oxygen Demand (COD) removal, power consumption, and current efficiency were studied. The maximum percentage removal of COD was observed to be 84% at a current density of 3 A/dm2at an electrolyte concentration of 10 g/l with an effluent COD concentration of 1000 ppm and at an initial pH of 6. The operating parameters for the treatment of distillery effluent by electrochemical process were optimized using response surface methodology by CCD. The quadratic regression models with estimated coefficients were developed for the percentage removal of COD and power consumption. It was observed that the model predictions matched with experimental values with an R2 value of 0.9504 and 0.9083 for COD removal and power consumption respectively. The extent of color removal and oxidation of organic compounds were analyzed using UV spectrophotometer and HPLC. 相似文献
2.
染料化工废水预处理实验研究 总被引:4,自引:0,他引:4
采用二级混凝沉淀工艺处理染料化工废水,探讨混凝剂种类、加入量和体系pH值对脱色效果的影响。实验结果表明,硫酸亚铁对染料废水脱色效果优于其他混凝剂。当进水色度为8000 ̄65000倍,COD浓度为2000 ̄10000mg/L,在pH为10.5条件下,硫酸亚铁投加量为500mg/L,活性凹凸棒投加量为80mg/L时,脱色率可高达97.69%,COD去除率最高可达76.86%,有利于后续生化处理。 相似文献
3.
4.
5.
以仲丁灵生产废水为研究对象,COD(化学需氧量)与色度为指标,研究了几种混凝剂与新型混凝脱色剂DH复合使用的混凝处理特性。通过不同的投配选择,得出了最佳的复合投加方式以及最佳药剂投加量。结果表明,采用硫酸亚铁与混凝脱色剂这种投加方式对该生产废水的预处理效果最佳,其色度去除率为70%,COD去除率为58%,有利于后续的生化处理;确定了最佳的药剂投加量为硫酸亚铁200mg/L,混凝脱色剂DH为250mg/L。 相似文献
6.
7.
8.
几种混凝剂应用于活性染料印染废水的脱色研究 总被引:2,自引:0,他引:2
应用PAC、BT-03、BT-04三种混凝剂处理了活性染料模拟废水和实际印染废水,研究了它们对以活性染料为主的印染废水脱色效果。结果表明,BT-03脱色效果较好。 相似文献
9.
10.
11.
12.
采用UV-Fcnton体系处理活性黑KNB染料废水.研究了pH值、H2O2和FeSO4用量、反应温度和反应时间等对染料废水脱色率的影响。实验结果表明,当KNB的初始浓度为50mg/L时,在t=25℃、pHi5.4、[H2O2]=0.2ml/L,[FeSO4]=0.7mmol/L。使用30W的紫外灯光照射条件.反应1小时后,KNB染料废水脱色率几乎可达100%。通过比较反应前后染料废水的UV-Vis吸收光谱,初步探讨了KNB的降解机理。研究表明,UV-Fenton体系可以有效地处理活性黑KNB染料废水,为该工艺处理实际染料废水提供基础数据。 相似文献
13.
14.
ABSTRACTThe efficacies of ozonation and peroxone (O3/H2O2) pretreatments were compared for citric acid wastewater sludge conditioning with the objective of improving dewatering characteristics of the sludge. Treatment with 84 mg O3/g dry solid (DS) and 12.5 mg/g DS H2O2 greatly enhanced the effectiveness of ozonation, providing sludge dewaterability similar to that obtained by ozonation at 250 mg O3/g DS. Most importantly, treatment of citric acid wastewater sludge with 84 mg O3/g DS and 12.5 mg/g DS H2O2 led to the preservation of the nutrient elements nitrogen, phosphorus, and potassium in the sludge with a minimal volatile suspended solids/total suspended solids reduction of 5.5%, which is much lower than that with ozonation at 250 mg O3/g DS. 相似文献
15.
《分离科学与技术》2012,47(6):920-932
In this work an ultrafiltration (UF) membrane system was investigated for the treatment of textile wastewater. UF membranes were assisted by activated sludge and minerals, which were employed as sorbents, to remove Cu(II), Pb(II), Zn(II), Ni(II), color, and organics. Significant variations were observed in metal removal efficiencies among the textile wastewater samples of different origin, even at the same pH (= 6) due to the presence of different compounds in wastewater. At the examined pH range (5.63–9.21), the dominant mechanism for copper and lead removal was the formation of insoluble metals due to precipitation and complexation of metal ions with wastewater compounds, including adsorption of metals on suspended solids and colloidal matter. The adsorption process of metals on minerals and activated sludge was the dominant process for nickel and zinc removal at low pH, while precipitation/complexation prevailed at higher pH. The examined adsorption-UF system could produce a treated effluent having low metal concentrations that could be safely discharged into municipal sewers. COD removal ranged from 76%–92% for the five textile wastewater samples. The color removal accomplished was significant (45%–70%), and depended on the type of dye. 相似文献
16.
17.
The combined process – aerobic bio-oxidation with activated carbon addition and ozonation was studied (ABO/AC/O3). The performance of the process was compared with conventional aerobic bio-oxidation (ABO). The studies were carried out in two continuous and periodic reactors to evaluate the purification efficiencies (in terms of COD, BOD and resorcinols removal), excess sludge generation and stability of the bioreactors against shock loadings. The parameters in continuous combined process were as follows: organics loading was 620 mgCOD/(day·L), activated carbon concentration 1g/L and ozone dose 2.45 mgO3/L (mg ozone per liter of treated water). In periodic reactors the combined process was studied at lower activated carbon concentration and ozone dose (0.3 g/L and 0.57 mg/L respectively).
The results indicated that compared with conventional ABO, the co-effect of AC addition and short-termed (less than 1 week) or intermittent ozonation improved the removal of COD and BOD, while the longer period of ozonation resulted in reduction of excess sludge concentration in the bioreactor. The impact of AC and ozone on the ABO in the combined process did not concern only increased biomass activity, but AC and ozone improved also settleability of activated sludge and enhanced stability of the bioreactor to shock loadings. 相似文献
18.
采用Cu~(2+)/H_2O_2法降解高浓度偏二甲肼(UDMH)废水,以废水中UDMH的去除率作为检测指标,通过正交实验确定了该反应的主要影响因素及最佳工艺条件,考察了最佳工艺条件下的降解效果;针对化学需氧量(COD)去除率低的问题,探讨了降解中间产物甲醛和亚硝基二甲胺的变化规律。结果表明,H_2O_2摩尔投加量为UDMH完全矿化理论摩尔投加量的1.5倍(1.5Qth)、初始pH值为9、Cu~(2+)与H_2O_2摩尔比1∶10、反应温度为20℃、反应进行120min后,废水中UDMH的降解率达98.88%,COD去除率达92.59%。但Cu~(2+)/H_2O_2法处理时产生有毒中间产物亚硝基二甲胺和甲醛,反应后期甲醛迅速降解,而亚硝基二甲胺则难以去除。 相似文献