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吸附—催化氧化—絮凝法联合处理造纸废水 总被引:14,自引:0,他引:14
采用吸附-催化氧化-絮凝法联合处理造纸废水,讨论了废水通过炉渣柱的滤速,在絮凝过程中Al2(SO4)3的加入量及催化氧化反应中溶液的pH值,铁屑的加入量,H2O2的加入量等主要因素对废水中COD去除率的影响,结果表明,COD,SS主要污染物去除率达97.0%和95.3%,各项指标超过一级排放标准,水质可以完全回收利用,为造纸废水的处理提供了新的技术方案。 相似文献
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以SnO2为载体,Au为活性组分,采用真空浸渍法、共沉淀法、沉积沉淀法制备CO氧化的催化剂,同时还制备双金属体系催化剂Au-Pd/SnO2和Au-Pt/SnO2。用气相色谱对所制备的催化剂进行活性评价,运用DSC、SEM、XRD、BET等对催化剂进行表征。在本实验条件下,载体二氧化锡焙烧温度为500 ℃,催化剂成型温度为350 ℃,金负载量为3%(wt.)时,用沉积-沉淀法制备的Au/SnO2活性最好,在18 ℃,空速为24 000 h-1条件下就能将CO(浓度为4%)完全氧化为CO2;添加铂和钯可提高Au/SnO2对CO的催化活性。 相似文献
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Degradation characteristics and metabolic pathway of 17alpha-ethynylestradiol by Sphingobacterium sp. JCR5 总被引:2,自引:0,他引:2
A 17alpha-ethynylestradiol (EE2)-degrading bacterium was isolated from the activated sludge of the wastewater treatment plant (WWTP) of an oral contraceptives producing factory in Beijing, China. On the basis of its morphology, biochemical properties and the 16S rDNA sequence analysis, this strain was identified as Sphingobacterium sp. JCR5. This strain grew on EE2 as sole source of carbon and energy, and metabolized up to 87% of the substrate added (30 mgl-1) within 10 d at 30 degrees C. In addition to EE2 the strain could be cultivated on steroidal estrogens like estrone (E1), 17beta-estradiol (E2), estriol (E3) and mestranol (MeEE2), the intermediates of contraceptive medicine processing and on some aromatic compounds. Mass spectrum analysis of the EE2 degradation showed that in the first step it is oxygenized to E1, 2-hydroxy-2,4-dienevaleric acid and 2-hydroxy-2,4-diene-1,6-dioic acid, which are the main catabolic intermediates. The former was analogous to the pathway of a previously reported testosterone-degrading bacterium Comamonas testosteroni TA441 and the latter is a metabolite with a different cleavage position of 3-hydroxy-4,5-9,10-disecoestrane-1(10),2-diene-5,9,17-trione-4-oic acid from the former. 相似文献
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Lugo-Ospina A Dao TH Van Kessel JA Reeves JB 《Environmental pollution (Barking, Essex : 1987)》2005,135(1):155-162
Nutrients in animal manure are valuable inputs in agronomic crop production. Rapid and timely information about manure nutrient content are needed to minimize the risks of phosphorus (P) over-application and losses of dissolved P (DP) in runoff from fields treated with manure. We evaluated the suitability of a commercial hand-held reflectometer, a hydrometer, and an electrical conductivity (EC) meter for determining DP and total P (TP) in dairy manures. Bulk samples (n = 107) collected from farms across CT, MD, NY, PA, and VA were highly variable in total solids (TS) concentration, ranging from 11 to 213gL(-1), in suspensions' pH (6.3-9.2), and EC (6.2-53.3 dS m(-1)). Manure DP concentrations measured using the RQFlex reflectometer (RQFlex-DP(s)) were related to molybdate-reactive P (MRP(s)) concentrations as follows: RQFlex-DP(s) = 0.471 x MRP(s) + 1102 (r2 = 0.29). Inclusion of pH and squared-pH terms improved the prediction of manure DP from RQFlex results (r2 = 0.66). Excluding five outlier samples that had pH < or = 6.9 the coefficient of determination (r2) for the MRP(s) and RQFlex-DP(s) relationship was 0.83 for 95% of the samples. Manure TS were related to hydrometer specific gravity readings (r2 = 0.53) that were in turn related to TP (r2 = 0.34), but not to either RQFlex-DP or MRP. Relationships between suspensions' EC and DP or TP were non-significant. Therefore, the RQFlex method is the only viable option for on-site quick estimates of DP that can be made more robust when complemented with TS and pH measurements. The DP quick test can provide near real-time information on soluble manure nutrient content across a wide range of handling and storage conditions on dairy farms and quick estimates of potential soluble P losses in runoff following land applications of manure. 相似文献
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净化汽车尾气的三效催化剂 总被引:3,自引:0,他引:3
在我国,汽车尾气对大气的污染日趋严重,使用三效催化剂净化汽车尾气势在必行。介绍了几种主要的三效催化剂及其应用情况。 相似文献
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