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排序方式: 共有48条查询结果,搜索用时 31 毫秒
1.
固定化真菌漆酶对分散兰-2BLN的脱色和降解 总被引:3,自引:0,他引:3
采用改良壳聚糖固定化的真菌漆酶对染料分散兰-2BLN进行脱色和降解条件的研究,探索了固定化漆酶活力、处理时间、染料浓度、温度和pH对其降解效果的影响。结果表明,固定化漆酶脱色降解分散兰-2BLN的适宜条件为:固定化漆酶活力18.2U/mL,染料浓度100mg/L,温度40℃,pH4.6,在上述条件下降解1.5h,分散兰-2BLN脱色率能达到87.68%。重复分批使用固定化漆酶处理2BLN兰,在使用6批次后,脱色率仍能保持在55%以上,其催化效率得到了较大提高。 相似文献
2.
Effects of bed materials on the performance of an anaerobic sequencing batch biofilm reactor treating domestic sewage 总被引:1,自引:1,他引:0
The objective of this study was to determine the best performance of an anaerobic sequencing batch biofilm reactor (AnSBBR) based on the use of four different bed materials as support for biomass immobilization. The bed materials utilized were polyurethane foam (PU), vegetal carbon (VC), synthetic pumice (SP), and recycled low-density polyethylene (PE). The AnSBBR, with a total volume of 7.2L, was operated in 8-h batch cycles over 10 months, and fed with domestic sewage with an average influent chemical oxygen demand (COD) of 358+/-110mg/L. The average effluent COD values were 121+/-31, 208+/-54, 233+/-52, and 227+/-51mg/L, for PU, VC, SP, and PE, respectively. A modified first-order kinetic model was adjusted to temporal profiles of COD during a batch cycle, and the apparent kinetic constants were 0.52+/-0.05, 0.37+/-0.05, 0.80+/-0.04, and 0.30+/-0.02h(-1) for PU, VC, SP, and PE, respectively. Specific substrate utilization rates of 1.08, 0.11, and 0.86mg COD/mgVS day were obtained for PU, VC, and PE, respectively. Although SP yielded the highest kinetic coefficient, PU was considered the best support, since SP presented loss of chemical constituents during the reactor's operational phase. In addition, findings on the microbial community were associated with the reactor's performance data. Although PE did not show a satisfactory performance, an interesting microbial diversity was found on its surface. Based on the morphology and denaturing gradient gel electrophoresis (DGGE) results, PE showed the best capacity for promoting the attachment of methanogenic organisms, and is therefore a material that merits further analysis. PU was considered the most suitable material showing the best performance in terms of efficiency of solids and COD removal. 相似文献
3.
固定化酵母菌对活性艳蓝KN-R的脱色研究 总被引:2,自引:0,他引:2
采用海藻酸钙加活性碳的方法对酵母菌进行固定化。正交试验结果表明,三者合适配比为海藻酸钠3%,活性碳10%,氯化钙4%。此方法制得的凝胶颗粒机械强度好、经久耐用。固定化酵母菌凝胶小球最适条件为:培养时间为48h,培养温度为37℃,培养基pH为3.0,凝胶量为10g。固定化细胞经多次脱色后能重复使用,4次脱色后其脱色率还达79.2%。 相似文献
4.
采用浸涂-烧结法制备的纳米TiO2光催化剂负载量约为6mg/g载体,催化剂经5次重复使用其催化效果稳定,表明催化剂表面TiO2粉体负载牢固;以高压汞灯为光源,对水中微量间二甲苯的负载型纳米TiO2光催化氧化过程的研究表明:初始浓度在6.68~17.36mg/L的范围内,间二甲苯的光催化反应遵循表现一级反应动力学规律,反应的表现速率常数随溶液初始浓度的增大而减小,半衰期则随初始浓度的增大而增加。 相似文献
5.
Siman RR Borges AC Ratusznei SM Rodrigues JA Zaiat M Foresti E Borzani W 《Journal of environmental management》2004,72(4):1324-247
The effect of organic loading on the performance of a mechanically stirred anaerobic sequencing biofilm batch reactor (ASBBR) has been investigated, by varying influent concentration and cycle period. For microbial immobilization 1-cm polyurethane foam cubes were used. An agitation rate of 500 rpm and temperature of 30+/-2 degrees C were employed. Organic loading rates (OLR) of 1.5-6.0gCODl(-1)d(-1) were applied to the 6.3-l reactor treating 2.0 l synthetic wastewater in 8 and 12-h batches and at concentrations of 500-2000mgCODl(-1), making it possible to analyze the effect of these two operation variables for the same organic loading range. Microbial immobilization on inert support maintained approximately 60 gTVS in the reactor. Filtered sample organic COD removal efficiencies ranged from 73 to 88% for organic loading up to 5.4gCODl(-1)d(-1). For higher organic loading (influent concentration of 2000mgCODl(-1) and 8-h cycle) the system presented total volatile acids accumulation, which reduced organics removal efficiency down to 55%. In this way, ASBBR with immobilized biomass was shown to be efficient for organic removal at organic loading rates of up to 5.4gCODl(-1)d(-1) and to be more stable to organic loading variations for 12-h cycles. This reactor might be an alternative to intermittent systems as it possesses greater operational flexibility. It might also be an alternative to batch systems suspended with microorganisms since it eliminates both the uncertainties regarding granulation and the time necessary for biomass sedimentation, hence reducing the total cycle period. 相似文献
6.
7.
水泥负载TiO2光催化降解染料水溶液的研究 总被引:18,自引:0,他引:18
研究了以TiO2为催化剂,且将TiO2涂布在模拟工业水处理浅池的水泥质池底表面,以直管高压汞灯为光源,对有机染料酸性玫瑰红B和晒化绿B进行光催化降解的可行性。结果表明,在实验条件下,本系统对以上染料有显著的光降解作用,浓度为25mg/L的上述二种染料溶液,经30min光照,其降解率分别达88.2%,此外,还探讨了染料浓度,染料体积、染料溶液PH值等因素对光降解的影响。 相似文献
8.
Biodegradation and bio-sorption of antibiotics and non-steroidal anti-inflammatory drugs using immobilized cell process 总被引:2,自引:0,他引:2
In the present study, the removal mechanisms of four antibiotics (sulfamethoxazole, sulfadimethoxine, sulfamethazine, and trimethoprim) and four non-steroidal anti-inflammatory drugs (acetaminophen, ibuprofen, ketoprofen, and naproxen) in immobilized cell process were investigated using batch reactors. This work principally explores the individual or collective roles of biodegradation and bio-sorption as removal routes of the target pharmaceuticals and the results were validated by various experimental and analytical tools. Biodegradation and bio-sorption were found as dominant mechanisms for the drug removal, while volatilization and hydrolysis were negligible for all target pharmaceuticals. The target pharmaceuticals responded to the two observed removal mechanisms in different ways, typically: (1) strong biodegradability and bio-sorption by acetaminophen, (2) strong biodegradability and weak bio-sorption by sulfamethoxazole, sulfadimethoxine, ibuprofen and naproxen, (3) low biodegradability and weak bio-sorption by sulfamethazine and ketoprofen, and (4) low biodegradability and medium bio-sorption by trimethoprim. In the sorption/desorption experiment, acetaminophen, sulfamethoxazole and sulfadimethoxine were characterized by strong sorption and weak desorption. A phenomenon of moderate sorption and well desorption was observed for sulfamethazine, trimethoprim and naproxen. Both ibuprofen and ketoprofen were weakly sorbed and strongly desorbed. 相似文献
9.
Biodegradation of 2,4,6-trichlorophenol in the presence of primary substrate by immobilized pure culture bacteria 总被引:8,自引:0,他引:8
In this study, pure strains that are capable of utilizing 2,4,6-trichlorophenol have been isolated from the mixed culture grown on substrates containing chlorophenolic compounds. Studies have been carried out on the capability of these isolated pure strains in suspended and immobilized forms to decompose 2,4,6-trichlorophenol. Additionally, the influence of primary substrates (e.g., phenol, 2-chlorophenol, 3-chlorophenol, 4-chlorophenol, 2,4-dichlorophenol) on the decomposition of 2,4,6-trichlorophenol by the isolated pure strains grown in immobilized form is also investigated. The results are: Through bacterial isolation and identification, three pure strains have been obtained: Pseudomonas spp. strain 01, Pseudomonas spp. strain 02 and Agrobacterium spp. Whether in suspended or immobilized forms, all strains have poor removal efficiencies of 2,4,6-trichlorophenol. However, addition of 200 mg/l phenol will enable the immobilized Pseudomonas spp. strain 01, and Pseudomonas spp. strain 02 to achieve 65% and 48% removal of 2,4,6-trichlorophenol, respectively. Addition of phenol will assist the immobilized Pseudomonas spp. strain 02 in achieving removal of 2,4,6-trichlorophenol but the removal efficiency is not good if the phenol concentration is too low. The optimum phenol concentration should be between 200 and 400 mg/l. 相似文献
10.
Mariana Valdez-Castillo Sonia Arriaga 《Frontiers of Environmental Science & Engineering》2021,15(3):43