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生物降解塑料及其活性污泥检测法 总被引:7,自引:0,他引:7
生物降解塑料及其活性污泥检测法吴勇(江苏省塑料检测站)关键词生物降解塑料活性污泥0前言塑料产品是人们日常生活中必不可少的东西。为了追求耐久性、经济性,人们开发了各种各样的在自然状态下(紫外线、光、水、酸、碱、微生物)稳定性很好的塑料。但这些优异的性能... 相似文献
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以月桂醇聚醚硫酸酯钠(AES)、月桂醇聚醚硫酸酯铵(AESA)为例:通过污泥耗氧速率的变化了解表面活性剂对活性污泥的抑制情况;用磁力搅拌表面曝气法代替震荡培养法测试了城镇污水处理厂的活性污泥对表面活性剂的生物降解能力;用污泥负荷表征表面活性剂的初级生物降解速率,便于计算用活性污泥法处理表面活性剂至其起泡性能消失所需的时间。实验结果表明,AES、AESA浓度≥200 mg·L-1时对活性污泥中部分微生物有抑制作用。当AES、AESA浓度≤100 mg·L-1时,用城镇污水处理厂的活性污泥好氧处理的初级生物降解速率分别为0.06 kg AES.(kg MLSS·d)-1、0.06 kg AESA.(kg MLSS·d)-1;用活性污泥法好氧处理20小时后的CODCr去除率分别为75.7%、79.9%;AESA的可生物降解性优于AES。 相似文献
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微波法合成醇胺类离子液体及其吸收SO_2研究 总被引:2,自引:0,他引:2
采用水浴微波法合成并表征了一系列由乙醇胺、二乙醇胺、三乙醇胺、N,N-二甲基乙醇胺提供阳离子,乳酸、乙酸、甲酸提供阴离子的醇胺类离子液体。通过正交实验对乙醇胺乳酸盐离子液体(HEL)的水浴微波合成条件进行了优化,当反应时间为30 min,反应温度为65℃,微波功率为300 W,乙醇胺和乳酸的摩尔比为1∶1.1时,能够得到较高的产率(92.74%)。发现HEL对SO2有较好的吸收选择性,且有较宽的温度适应范围,同时微波辅助能加快解吸速率,大大缩短解吸时间;此外,添加溶剂后的离子液体也显示出良好的吸收效果。这为离子液体的进一步工业化应用奠定了一定的基础。 相似文献
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通过嗜热菌活性污泥法处理焦化厂高温焦水废水的连续与间歇试验及动力学参数的测定,全面探索了嗜热菌活性污泥法处理高温有机废水的一般特性,并提出工业上宜采用推流式工艺,为生物处理高温暖水开辟了工业应用的前景。 相似文献
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《应用化工》2017,(1):62-65
以碳酸乙烯酯和甲胺为原料,合成N-甲基二乙醇胺的工艺。对催化剂进行筛选,以获取绿色高效的催化剂。在较佳的催化剂反应体系下,分别考察催化剂用量、配料比、反应温度、甲胺滴速对反应的影响,结果发现上述因素对反应收率、转化率、选择性均有显著影响,且都有一个最佳值,获得的最优化反应条件为:选取717阴离子交换树脂作催化剂,用量为1 g(占液相质量的3.3%),n(碳酸乙烯酯)∶n(甲胺水溶液)=1∶2,反应温度为130℃,甲胺滴速0.3 m L/min。在最优化的反应条件下,N-甲基二乙醇胺收率达到28.22%,碳酸乙烯酯的转化率为98.94%,N-甲基二乙醇胺的选择性达到28.52%。 相似文献
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It is shown, that reaction engineering models of the activated sludge process for biological waste water treatment predict an order of magnitude of the influence of residence time distribution in the aeration basin, that is not verified by practical experience. The kinetic model of Wuhrmann, that interprets the kinetics of substrate removal as a superposition of zero order reactions gives reasonable agreement with experimental results. 相似文献
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Lignocellulose degradation is important when applying biodrying treatment to sewage sludge intended for land use. This study investigated the lignocellulose degradation in the biodrying of sewage sludge and sawdust. The experiment analyzed lignocellulose content, lignocellulase activity, humic substances, and fungal communities. After biodrying, lignin, cellulose, and hemicellulose degradation rates were 48.4, 38.8, and 45.0%, respectively. Carboxymethyl cellulase, lignin peroxidase, and xylanase played key roles. During the thermophilic phase, more than 80% of the microorganisms in the sample contributing to lignocellulose degradation were Ascomycota. The lignocellulose degradation and a rate of increase in humic acid/fulvic acid of 380% benefit land use of biodrying product. 相似文献
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浸膜式活性污泥法是将膜堆浸没于污水池中进行固液分离的一种方法,即将膜堆直接放置在生物反应池中,在膜堆的下面进行曝气,利用曝气池内污水的流动和生物反应,采用吸附过滤式,获得安全的高质的二级处理水。 相似文献
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Daniela P Mesquita Antonio L Amaral Eugenio C Ferreira Maria AZ Coelho 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2009,84(4):554-560
BACKGROUND: In activated sludge systems, sludge settling ability is considered a critical step in effluent quality and determinant of solid–liquid separation processes. However, few studies have reported the influence of saline wastewater on activated sludge. This work aims the evaluation of settling ability properties of microbial aggregates in a sequencing batch reactor treating saline wastewaters of up to 60 g L?1 NaCl, by image analysis procedures. RESULTS: It was found that the sludge volume index (SVI) decreased with salt content up to 20 g L?1, remaining somewhat stable above this value. Furthermore, it was found that between the first salt concentration (5 g L?1) and 20 g L?1 aggregates suffered a strong deflocculation phenomenon, leading to a heavy loss of aggregated biomass. Regarding SVI prediction ability, a good correlation coefficient of 0.991 between observed and predicted SVI values was attained. CONCLUSION: From this work the deflocculation of aggregated biomass with salt addition due to pinpoint floc formation, dispersed bacteria growth and protozoa absence could be established. With respect to SVI estimation, and despite the good correlation obtained, caution is advisable given the low number of SVI data points. Copyright © 2008 Society of Chemical Industry 相似文献
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提高活性污泥法氨氮去除率的研讨 总被引:3,自引:0,他引:3
利用原有推流式曝气池,采用改变常规操作的方法而改变活性污泥的活性,可在保证COD、酚、油等指标达标的同时,提高氨氮的去除率。经试验,此方法可行。 相似文献