共查询到20条相似文献,搜索用时 15 毫秒
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活性污泥法处理污水产生的大量剩余污泥已成为大多数污水处理厂亟待解决的问题,而污泥减量就是从源头上减少污泥的产生。臭氧氧化技术是一种有潜力的清洁无二次污染的污泥减量技术。文中阐述了臭氧在污泥减量技术中的应用背景及基本原理,从不同角度分析了臭氧氧化技术的应用现状,指出了最新的研究热点以及当前存在的问题和未来可能的发展方向。 相似文献
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Ying Xu Chen Fen Xia Ye Xiao Shan Feng 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2004,79(2):111-116
To determine whether chemical additions can be used to reduce sludge production in biological wastewater treatment, 3,3′,4′,5‐tetrachlorosalicylanilide (TCS) was added to activated sludge cultures as a metabolic uncoupler. Batch tests confirmed that TCS is an effective chemical uncoupler in reducing the sludge yield at concentrations greater than 1.0 mg dm?3; a TCS concentration of 1.0 mg dm?3 reduced sludge yield by approximately 50%. Substrate removal capability and effluent nitrogen concentration were not affected adversely by the presence of TCS when dosed every other day in a range of 2.0–3.6 mg dm?3 during the 40‐day operation of activated sludge batch cultures. Such sludge growth reduction was associated with the enhancement of microbial activities in terms of the specific oxygen uptake rate and dehydrogenase activity. Sludge settleability of the treated and control samples was qualitatively comparable and not significantly different. Filamentous bacteria continued to grow in sludge flocs only in the control reactor at the end of the 40‐day trial. These results suggest that TCS treatment of activated sludge systems may reduce excess sludge yield. Copyright © 2003 Society of Chemical Industry 相似文献
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过氧乙酸对剩余污泥的减容研究 总被引:10,自引:0,他引:10
为提高剩余污泥的生物降解效率,选用过氧乙酸(PAA)对剩余污泥进行氧化预处理。验证了P从能通过破坏细胞壁使活性污泥细胞溶解,从而实现污泥减容;并探讨了溶解过程中的影响因素,以及被处理后污泥的生物可降解性。主要通过污泥浓度(MLSS)~变化来表征污泥的溶解率,并结合溶解性总有机碳(DOC)等参数的变化进行分析。结果表明,PAA的污泥溶解率为10%左右,经过超声分散后溶解率可以达到22.5%;0.01%PAA溶液和污泥反应6h后,基本上不残留PAA和H2O2,其处理后的污泥混合液具有较好的生物可降解性,DOC的利用率在87%以上。研究表明了过氧乙酸用于剩余污泥的减容具有较强的可行性。 相似文献
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对近年来寡毛类蠕虫污泥减量工艺和寡毛类蠕虫生长繁殖规律的研究进展进行了系统评述. 除了种属以外,寡毛类蠕虫在活性污泥系统中的稳定存在、生长和繁殖直接影响到其对活性污泥的捕食和削减能力,其生长繁殖规律受到底物性质、环境因素、种群密度等因素影响. 现有研究大多采用表观污泥产率系数来衡量寡毛类蠕虫污泥减质效果,该方法易受到活性污泥工艺中多种因素的影响,且忽略了蠕虫对活性污泥的浓缩、团聚作用,不能准确反映寡毛类蠕虫的污泥减质效果. 而同位素示踪方法为寡毛类蠕虫污泥减质效果评价、筛选适于活性污泥系统的寡毛类蠕虫种属提供了一条新途径. 寡毛类蠕虫具有改善活性污泥沉降的性能,亦可考虑将其应用于污泥减容. 相似文献
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微波诱导催化氧化剩余污泥的研究 总被引:1,自引:0,他引:1
以活性炭为催化剂,对微波诱导氧化剩余污泥过程中污泥性质的变化进行了研究.结果表明,在微波辐照功率为800 W、微波辐照时间为60 s、SS的活性炭投加量为0.3 g·g~(-1)时,污泥溶解率达到28.9%,同单独微波处理污泥相比,污泥溶解率增大10%.在此操作条件下,更多的微生物胞外聚合物分解、胞内物质释放到液相中,使污泥上清液中溶解性有机物含量明显增加.污泥破解后,磷释放到溶液中,使TP的质量浓度增加了1.4倍.在微波辐照活性炭产生的高温及氧化剂作用下,部分有机氮被矿化,NH4_4~+-N的质量浓度由7.9增至14.2 mg·L~(-1). 相似文献
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A Huysmans M Weemaes P
A Fonseca W Verstraete 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2001,76(3):321-324
Intermittent ozonation of a part of the recycle sludge was performed two times a week for a laboratory‐scale reactor at an average ozone dose of 0.019 g O3(gSSozonated)?1. Under these conditions a decrease of about 50% in sludge growth was obtained for the ozone‐treated system, in comparison with the control. As a consequence less sludge had to be removed from the test reactor. Only a slight decrease in quality of effluent was noticed. A comparative cost calculation was made, based on these results, between an ozone‐treated activated sludge system and a traditional activated sludge system. © 2001 Society of Chemical Industry 相似文献
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煤气废水好氧-缺氧-好氧生物处理研究 总被引:1,自引:0,他引:1
煤气废水生物处理目前遇到的主要问题是系统运行不稳定及氨氮去除率低,针对这些问题开发出好氧-缺氧-好氧生物处理工艺.实验表明,新工艺在入水COD较高的条件下可以稳定运行,系统中一级好氧白土-活性污泥单元作用较大.系统在平均入水COD为2 204mg/L、氨氮为244mg/L的条件下,COD和氨氮去除率分别可达87.6%和80%,HRT的降低对系统COD去除率影响不大,但使氨氮去除率降低到67%,主要是由于一级好氧单元硝化作用减弱所致.该工艺提高了煤气废水生物处理的功效,特别是在去除氨氮方面具有很大的优势,为后续深度处理奠定了基础. 相似文献
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Xin Zhou Yaxin Li Yi Zhao Xiuping Yue 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2013,88(2):305-310
BACKGROUND: Biological treatment efficiency of coking wastewater is rather poor, especially for chemical oxygen demand (COD) and ammonia‐nitrogen (NH$_{4}^{+}$ ‐N) removal due to its complex composition and high toxicity. RESULTS: A pilot‐scale anaerobic/anoxic/oxic/oxic (A2/O2) biofilm system has been developed to treat coking wastewater, focusing attention on the COD and NH$_{4}^{+}$ ‐N removal efficiencies. Operational results over 239 days showed that hydraulic retention time (HRT) of the system had a great impact on simultaneous removals of COD and NH$_{4}^{+}$ ‐N. At HRT of 116 h, total removal efficiencies of COD and NH$_{4}^{+}$ ‐N were 92.3% and 97.8%, respectively, reaching the First Grade discharge standard for coking wastewater in China. Adequate HRT, anoxic removal of refractory organics and two‐step aerobic bioreactors were considered to be effective measures to obtain satisfactory coking effluent quality using the A2/O2 biofilm system. The correlation between removal characteristics of pollutants and spatial distributions of biomass along the height of upflow bioreactors was also revealed. CONCLUSION: The study suggests that it is feasible to apply the A2/O2 biofilm process for coking wastewater treatment, achieving desirable effluent quality and steady process performance. © 2012 Society of Chemical Industry 相似文献