共查询到18条相似文献,搜索用时 125 毫秒
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介绍了水环境中氟喹诺酮类抗生素的危害,分析了其在污泥吸附、微生物降解和光降解作用下的去除机理。综述了去除氟喹诺酮类抗生素的常规处理技术(活性污泥法和人工湿地)、深度处理技术(高级氧化和膜处理),以及新型处理技术(超声降解、土壤渗滤系统和生物电强化)的研究进展与优劣,指出不同反应体系的去除机理和途径不一致,需要针对多相、多污染介质的复杂实际环境开展进一步研究。 相似文献
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本文探讨了SBR和PAC-SBR反应器处理盐酸林可霉素原料液生产废水过程中活性污泥特征的变化.随着废水投加量的增加,PAC-SBR反应器的污泥性能始终优于SBR反应器,但是由于盐酸林可霉素原料液生产废水对生物较强的抑制作用,PAC-SBR反应器和SER反应器中污泥的活性均发生恶化,COD去除率已明显下降,单独采用SBR或PAC-SBR法处理已难以达到排放标准,必须进行工艺的组合.PAC-SBR反应器较SBR反应器在污泥性质及处理效率上均有一定的改善,处理盐酸林可霉素原料药生产废水有一定的优势. 相似文献
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微污染水源水中污染物质的控制和净化技术 总被引:3,自引:0,他引:3
微污染水源水中含有微量的有害污染物,对这些污染物的去除,除要保留或改进传统的处理工艺外,还要附加生化或特种物化处理工序,目前采用最多的净化处理工艺是预处理和深度处理,在此基础上还发展了纳滤膜、电生物反应器、膜生物反应器、生物活性滤池等技术,这些技术的发展为微污染水源水的处理提供了新的途径。 相似文献
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对人工湿地污水处理工艺及其对水中污染物的去除机理进行了综述,并对人工湿地处理污水的技术进行了展望。 相似文献
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膜生物反应器是将膜分离技术与生物处理工艺相结合的一种新型废水处理技术.综合论述了膜生物反应器的发展概况、基本原理、技术特点及分类等. 相似文献
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综述了膜生物反应器的发展历程和膜生物反应器在污水处理中的应用研究现状,并就膜污染问题的机理及其研究情况进行了介绍. 相似文献
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采用完全好氧式膜生物反应器富集耐低温硝化污泥,通过低温冲击强化试验研究硝化污泥的耐低温特性。结果表明,低温对硝化污泥中微生物的群落多样性影响较大,温度越低,微生物多样性越低。低温强化组投加了耐低温高硝化菌含量硝化污泥,使得硝化菌在反应器内生长趋势良好,对低温冲击的恢复更有效果,且低温硝化污泥比中温硝化污泥具有更好的氨氮及亚硝氮去除效果。 相似文献
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Proper control of the activated sludge process is essential in ensuring production of good effluent. COD adsorption capacity (CAC) of the activated sludge could be used as a control parameter. CAC is determined by mixing the activated sludge with the settled sewage and measuring the instantaneous COD reduction per unit mass of activated sludge. CAC measures substrate removal by physical adsorption and reflects the quality of the activated sludge. CAC of a healthy activated sludge increases with the flow along the aeration units. CAC could be used for process decision on variation in air supply and feed pattern to the aeration units. In a modified process to cope with sludge bulking problem, CAC could be used to estimate the air supply to the aeration unit which is merely used for reaerating the returned sludge. 相似文献
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Camacho-Muñoz D Martín J Santos JL Alonso E Aparicio I De la Torre T Rodriguez C Malfeito JJ 《Journal of environmental monitoring : JEM》2012,14(5):1428-1436
In this work the effectiveness of membrane bioreactors as advanced treatment on the removal of emergent and priority organic compounds in wastewater treatment plants has been evaluated during a one-year monitoring study. The studied wastewater treatment plant operates with flat sheet and hollow fibre membranes in two parallel lines. Moreover, a reverse osmosis module connected in series after the hollow fibre membrane was evaluated for one month. Comparison of membrane bioreactor and conventional activated sludge treatment was also investigated, as well as the influence of the physicochemical properties of the compounds on the removal rates achieved. Sixteen pharmaceutical compounds belonging to seven therapeutic groups and eight priority organic pollutants, including linear alkylbenzene sulfonates, nonylphenol and its ethoxylates and phthalate, were monitored. The highest mean concentrations corresponded to priority organic pollutants (309 μg L(-1) of linear alkylbenzene sulfonate C(12)) followed by pharmaceutical compounds (24.5 μg L(-1) of ibuprofen). No significant difference of effectiveness was found among flat sheet and hollow fibre membranes. However, an improvement was obtained with the addition of a reverse osmosis module for most of the compounds. Biodegradation has been shown as the main route involved in the removal of organic compounds during both technologies. 相似文献
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以城市污水处理厂的脱水污泥为原料,通过超声波细胞破碎制备微生物絮凝剂。采用控制变量法考察污泥浓度、超声波破碎时间对絮凝剂絮凝效果的影响,并探究絮凝液的投加量、pH值、温度、振荡时间、振荡频率、共存金属等因素对5 mg/L Cu^2+模拟废水的去除效果,分析了微生物絮凝剂去除Cu^2+的作用机理。结果表明:当污泥质量浓度为100 g/L,超声波破碎时间15 min时,絮凝剂的絮凝效果最好;当pH值为6.5,温度50℃,絮凝液投加量40 mL,振荡时间1 min,振荡频率200 r/min时去除效果最佳。 相似文献
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Dagna So?tysik Ilona Bednarek Tomasz Loch Sabina Ga?ka Daniel Sypniewski 《Environmental monitoring and assessment》2011,176(1-4):343-354
Bulking of activated sludge is a world-widely prevalent problem and can lead to loss of bio-oxidation, further deterioration of effluent quality, and even to a complete breakdown of the entire treatment process. Most common reasons of bulking are bacterial community changes, especially excessive growth of filamentous bacteria or excess of biopolymers on surface of non-filamentous microbes. Because of complex nature of the bulking phenomenon, the successful bulking control strategy finding is still a very important need awaiting new options and advices. The repetitive extragenic palindromic PCR (REP-PCR) fingerprinting method has been applied to distinguish bacterial community in non-bulking and bulking activated sludge. The characteristic REP-PCR fingerprinting patterns, using the Ward??s clustering method, have been analyzed to determine homology/similarity relation between particular non-bulking and bulking sludge sampling. The received clustering results were in high concordance with activated sludge typing done based on physicochemical sludge analysis. The choice and application of molecular typing method in sludge analysis will depend upon the needs, skill level, and resources of the laboratory. The proposed REP-PCR method and statistical analysis of fingerprinting patterns seems to be simple, rapid, and effective methods to show differences between population in non-bulking and bulking activated sludge. It is easy to implement, and it may be useful for routinely activated sludge monitoring as well as may be helpful in early detection of bulking process. 相似文献
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This investigation aims to represent aerobic utilization of biodegradable organic matter present in wastewater by a rate equation. This rate equation can then be used to develop a substrate utilization (removal) kinetic model for unsteady state activated sludge process. To achieve this objective, theoretical utilization of biodegradable organic matter in batch process and growth pattern theory were studied. Also, experimental data representing removal of organic matter in different types of wastewaters were collected and analyzed for batch and continuous activated sludge assays. A rate equation was proposed to describe the utilization of biodegradable organic matter based on theoretical analysis of batch process. This rate equation was then verified through differential and integral analysis of the experimental data. Furthermore, a substrate kinetic model for batch and continuous processes was developed. The developed rate equation will facilitate the analysis and design of sequencing batch reactor (SBR) technology for biological treatment of wastewater. 相似文献
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Taofeek Salaudeen Omobola Okoh Foluso Agunbiade Anthony Okoh 《Environmental monitoring and assessment》2018,190(5):299
The removal capacity of different wastewater treatment plant (WWTP) technologies adopted in rural areas for phthalate was investigated in the Eastern Cape, South Africa. Wastewater samples collected from three selected WWTPs which use activated sludge (AS), trickling filter (TF), and oxidation pond (OP) technology were extracted using the solid-phase extraction method followed by gas chromatography-mass spectrometry (GC-MS) analysis. The six selected phthalate esters (PAEs) dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n-butyl phthalate (DBP), benzyl butyl phthalate (BBP), di(2-ethyl hexyl) phthalate (DEHP), and di-n-octyl phthalate (DOP) were detected in all the samples collected from the WWTPs. DBP was the most abundant compound in the influent, effluent, and sludge samples with a maximum detection of 2497 μgL?1, 24.2 μgL?1, and 1249 μg/g dW, respectively, followed by DEHP and BBP. There was a relatively high removal capacity achieved by AS in Alice, TF in Berlin, and OP in Bedford with a removal efficiency that varied between 77 and 99%, 76 and 98%, and 61 and 98%, respectively. A high significant correlation of PAE removal with total suspended solids (TSS) and turbidity suggests that the removal performance proceeded more through adsorption on settling particles and sludge than on biodegradation. However, the concentrations of PAEs detected in the final effluent and sludge samples exceeded acceptable levels allowed internationally for a safe aquatic environment. AS may have exhibited a more stable and better performance across the different seasons; however, pollution source control still deserves a special attention to prevent the risk posed by these micropollutants. 相似文献
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Investigation of organic nitrogen and carbon removal in the aerobic digestion of various sludges 总被引:2,自引:0,他引:2
Nitrification and carbon removal are investigated in aerobicbatch digestion of various sludges. The experiments arecarried out with activated sludge (Test 1) and with amixture of activated and primary settling sludge (Test2). The nitrification rate was monitored, measuring theNO2
- concentration. At the 3rd day of thedigestion 40.7 mgNO2-N/l and 3.89 mgNO2-N/l werefound in Tests 1 and 2 respectively. In a digestion process,the degradation of biomass indicates the beginning of theendogenous phase. Our measure for biomass content of thesludge was protein analysis. In Test 1, the first day valuesof 50.93 mgTOC/ gdry matter/day and 138.53mgprotein-C/gdry matter/day for specific TOC andprotein-C removal rates showed, that the digestion processbegan in the endogenous phase. For Test 2, since theendogenous phase began after removal of raw organic matter inprimary settling sludge, specific TOC and protein-C removalrates were observed to be 60.12 mgTOC/gdry matter/dayand 26.72 mgprotein-C/gdry matter/day,respectively. 相似文献