共查询到20条相似文献,搜索用时 140 毫秒
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对原RT倍司(4-氨基二苯胺)生产工艺过程中产生的还原废水的处理方法进行了改进,用一套简单蒸馏装置,控制馏出液的pH值,使苯胺及部分有机物在前馏份中采出,回收的苯胺馏份循环使用,釜残列机盐进一步回收利用,废水COD达厂级废水排放标准。 相似文献
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针对某精细化工企业生产废水的不同水质特点,将废水进行分类收集,根据不同处理需求,选择“蒸馏+隔油+Fenton氧化”工艺对高盐废水、树脂脱附废水进行预处理,选择“隔油+Fenton氧化”工艺对高浓废水、废气洗涤水进行预处理,预处理后废水再与其他低浓水按照一定比例复配,满足生化进水要求后,采用“水解酸化+两级A/O+混凝沉淀”工艺处理综合废水。该工艺不仅适合较复杂的水质处理,还适合应对波动性大的生产工况;预处理效果显著,综合出水可稳定达标。实际运行效果证明,综合废水COD、氨氮、总氮去除率分别达到85%、80%、75%及以上,处理排放水质远低于园区污水处理厂接管标准,其他特征指标也满足《化学工业水污染物排放标准》(DB32/939—2020)表4有机特征污染物排放标准。 相似文献
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环保对线路板废水排放提出了越来越严格的要求。针对线路板废水不能稳定达标排放的问题,本设计就各种工艺的特点、经济性等多方面进行了比较,结合本设计废水特点,选择预处理+深度处理工艺对废水进行处理。预处理采用酸化、混凝沉淀等工艺,深度处理采用Fenton氧化+曝气生物滤池组合工艺,进一步降解COD、铜。通过处理,该厂废水将能达到《电镀水污染物排放标准》排放标准。 相似文献
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何慧 《中国石油和化工标准与质量》2019,(6):48-49
在化工企业的废水处理中,氨氮含量的测定通常采用纳氏试剂比色法。在采用该方法进行测定时,蒸馏预处理环节耗费了较长的时间,而且馏出液收集环节繁琐,制约了工作效率的提升。本文针对这一实际问题提出了具体的优化措施:将蒸馏预处理中的水样蒸馏体积减少,后续的比色试样体积相应减少,另外将硼酸吸收液去除,采用直接接受馏出液的形式。对上述措施的实际测定结果与国标中的测定结果相对比,结果没有显著性差异,采用改进后的氨氮测定方法得到的实验数据稳定,值得相关人士参考借鉴。 相似文献
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己内酰胺化工废水COD、氨氮浓度高,pH值变化幅度大,可生化性低,是难降解的一类工业废水。其中,氨肟化装置排出的废水COD高达7 000~8 000 mg/L,氨氮高达600 mg/L,重排装置排出的废水COD高达4 000 mg/L,氨氮高达2 000 mg/L。根据各生产环节排放的废水特点分别对氨肟化废水进行芬顿催化氧化预处理、对双氧水废水进行气浮预处理;针对预处理后的综合废水可生化性仍然较低的特点,采用多级水解+多级AO+深度处理组合工艺对污染物进行有效去除,出水满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准。该工艺抗冲击能力强,处理效率高,运行稳定。 相似文献
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介绍了针织废水处理改扩建工程的设计与运行,该工程采用混凝沉淀和水解酸化工艺对色度大、COD浓度高的针织废水进行预处理,COD、色度去除率分别大于30%、60%,m(BOD):m(COD)提高30%以上。预处理后的废水再经活性污泥法处理,达到了《纺织染整工业水污染物排放标准》GB4287-92的I级标准。 相似文献
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《水处理技术》2017,(6)
针对抛光废水因水质复杂、COD高、生化性差和处理成本高等特点,采用减压蒸馏法对抛光废水进行处理,探索消泡剂投加量对抛光废水消泡效果影响。结果表明:投加量1.0 g/L的消泡剂对抛光废水消泡效果明显;温度与真空度越高,馏液COD越大,选择温度为90℃、真空度为80 k Pa为较好蒸馏条件;馏液COD随着p H增大逐渐减小,p H为8时蒸馏效果较好,此时COD为285 mg/L;馏液COD随着浓缩比增大先减小再增大,以90%为浓缩体积比为宜;减压蒸馏初期与末期馏液COD较高,中期较低。减压蒸馏法在处理抛光废水方面具有投药量少、工序简单、成本低、无二次污染等优势。 相似文献
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煤气化废水深度处理技术研究 总被引:1,自引:0,他引:1
首次采用预处理+二级生物处理+深度处理组合工艺处理煤化工废水。其中预处理(隔油-气浮-脱酚-蒸氨)以脱油、去除悬浮物、回收酚类和氨为目的,二级生物处理(二级内循环UASB-ABFB)是降解以非挥发酚为主的COD和生物脱除高浓度氨氮,最后采用臭氧活性炭工艺深度处理残余的COD。该工艺出水能达到《污水综合排放标准》(GB 8978—1996)一级标准要求,具有耐冲击负荷和出水水质稳定的特点。 相似文献
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利用化工过程模拟软件Aspen plus,模拟了乙烯裂解焦油的精馏过程,优化了各精馏塔的馏出率、回流比、进料板位置、进料温度等参数,可减少能量消耗13.9%。 相似文献
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《分离科学与技术》2012,47(2):309-314
Abstract In this short note we present a method and describe a simple apparatus for use with simple, fractional, and steam distillation operations in which the operator requires a precise measurement of instantaneous distillate composition as the distillation proceeds. There are many examples in which such a measurement will play a critical role. One such example is in the measurement of boiling or distillation curves, where one desires an explicit measure of distillation process temperatures as a function of distillate volume fraction. The ability to augment temperature‐volume distillation curves with composition information is very helpful. The optimization of critical distillation conditions for the separation of sensitive solutes is another example in which instantaneous distillate composition is of value. The purification of reactants before a reaction is still another example. In all of these cases, it is the instantaneous composition that emerges from the condenser that is needed, rather than the integrated composition of the distillate that accumulates in the receiver. In this note, the apparatus and method are described, and an example is given with a mixture of n‐decane/n‐tetradecane. 相似文献
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为了降低实际生产时中间馏分对高纯度长叶烯单离的影响,对重质松节油单离长叶烯过程中的中间馏分质量分数进行监测,并测定产品的相对密度和折光指数,实验结果表明:长叶蒎烯、长叶环烯存在于整个长叶烯单离过程,长叶蒎烯的影响显著高于长叶环烯。在操作压力-0.1 MPa、塔釜温度150℃、回流比1∶7条件下对重质松节油进行精馏,在精馏过程中可通过调整回流比或降低塔釜温度的方式最大程度降低中间馏分对长叶烯质量分数的影响。当塔顶馏出液的d20位于0.926 0~0.926 3时,调整回流比为1∶10或当塔顶馏出液中长叶烯质量分数超过30%后,塔釜温度降低至140~145℃之间,当塔顶馏出液d20>0.933 5时,塔釜温度再升至150℃。这两种方式均可获得90%以上长叶烯,并且长叶蒎烯、长叶环烯质量分数总和低于1.5%。 相似文献
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通过实沸点蒸馏仪对加氢柴油进行精密分离,得到不同馏程温度段的窄馏分油,分析了不同窄馏分油的收率分布与烃类组成分布,分析结果表明:随着馏程温度升高,窄馏分油收率逐渐降低,加氢柴油中的链烷烃主要富集在馏程温度点高的窄馏分中,环烷烃与芳烃主要富集在馏程温度低的窄馏分中。焦化轻蜡油回炼加氢柴油窄馏分油后,加氢裂化产物65~175 ℃馏分收率增加,>175 ℃馏分收率均降低。由于窄馏分油中的烃类组成不同,所得加氢裂化产物性质有所差异。掺炼富含环烷烃与芳烃的窄馏分油所得65~175 ℃馏分芳潜值最高,掺炼链烷烃窄馏分油所得>175 ℃馏分的十六烷值指数最高。 相似文献
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Spruce wood residues were treated in a vacuum pyrolysis Process Development Unit with a throughput capacity of 28 kg/h. Two aqueous phase condensate samples with COD concentration varying between 190 and 255 g/L were produced and sequentially extracted with dichloromethane and ethylacetate solvents. The soluble organic matter was composed of acidic, phenolic, alcoholic and ketonic compounds. The insoluble fraction was sequentially distilled at 100 and 110°C under atmospheric pressure. Mainly water was recovered in the first distillate, while the second distillate contained 30.4% formic and acetic acids, 69.4% water and 0.2% residual organic compounds. The distillation residue was rich in oxygen and was essentially insoluble in any organic solvent. The two aqueous phase pyroligneous samples were treated in Bat-telle's Thermochemical Environmental Energy System (TEESr?), a registered service mark of Onsite*Ofsite, Inc. of Duarte, California, U.S.A. The results of the tests showed that similar results were obtained with either feedstock. In batch tests a COD reduction of 99% was achieved. The product gas composition was typically about 49% methane, 5% hydrogen, 1 % ethane and 45% carbon dioxide. Tests in a continuous stirred-tank reactor produced reproducible data which can be used for process scale-up. Catalyst lifetime was identified as needing further improvement. The preliminary results demonstrated the technical feasibility of the catalytic gasification process as a useful step in the recovery of energy from the secondary condensate stream and the cleanup of the by-product water from vacuum pyrolysis of wood. 相似文献
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Yasuki Kansha Naoki Tsuru Chihiro Fushimi Kaoru Shimogawara Atsushi Tsutsumi 《Chemical engineering science》2010,65(1):330-334
A novel modularity of heat circulation for distillation process, which reduces the energy consumption, is proposed. By incorporating compressors and heat exchangers, the heat of the distillate is recuperated and exchanged with the heat of the feed streams. The proposed technology achieves the reduction in the required energy more than 75% as compared with a benchmark process which uses external heat source for heating. This shows the proposed modularity of heat circulation for distillation process is very promising technology to drastically reduce energy demand for distillation. 相似文献