共查询到20条相似文献,搜索用时 93 毫秒
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某制药废水具有水质、水量变化范围大,有机污染物浓度高,废水中含有大量悬浮物、氨氮、油类与各种重金属以及微生物生长抑制剂。进水COD_(Cr)、BOD_5、NH_4~+-N的质量浓度分别为35955 mg/L、5000 mg/L、1141 mg/L。采用"预处理+水解酸化+UASB+二级A/O+MBR膜"的组合处理工艺,进水COD_(Cr)、BOD_5、NH_4+-N的去除率99.77%、99.7%、99.4%,出水指标达到广东省《水污染物排放限值》(DB44/26-2001)第二时段一级标准、《化学合成类制药工业水污染物排放标准》(GB21904-2008)表2标准中较严者标准。 相似文献
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《广东化工》2021,48(13)
某环保科技公司有污水处理站1座,主要处理环氧丙烷生产废水和其他废水,随着更严标准的制定,原有污水站需进行提标改造。本实例环氧丙烷废水具有含化工污染物、含盐量高、Cl~-含量,温度高,废水可生化性较差的特点,环氧丙烷废水预处理后和其他废水混合后综合处理。改造后的废水处理站采用"降温调节+二级初沉池+曝气池+二沉池+中间水池+ABR+好氧池+接触氧化池+絮凝沉淀池"处理工艺,出水达标排放至受纳水体。综合废水 COD_(Cr) 600~800 mg/L、BOD_5≤300 mg/L、SS≤200 mg/L、Cl~-≤14000 mg/L、pH 为 8~10,出水 COD_(Cr)≤50 mg/L、BOD_5≤20 mg/L、pH为6~9。COD_(Cr)、BOD_5的去除率达到94.6%、94.4%。 相似文献
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印染废水水质变化大,色度高,成分复杂,属难处理工业废水种类。某印染厂污水处理规模为600 m3/d,设计进水水质:COD_(Cr):1180.0 mg/L,BOD_5:240.8 mg/L,SS:500.0 mg/L,NH_3-N:15.0 mg/L,色度:1200倍,采用"混凝/二级生化/二沉"为主体的处理工艺,处理后的出水水质:COD_(Cr):70.6 mg/L,BOD_5:15.6 mg/L,SS:20.2 mg/L,NH_3-N:6.3 mg/L,色度:8.0倍。处理后的出水水质优于《纺织染整工业水污染物排放标准》(GB 4287-2012)中的直接排放水质标准,可达标排放。 相似文献
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合成氨废水处理工艺设计 总被引:1,自引:0,他引:1
某地合成氨公司采用CASS+MBBR工艺处理厂区综合污水,当进水BOD_5、COD_(Cr)、NH_3-N、SS质量浓度分别为300、600、500、300mg/L时,设计出水BOD_5、COD_(Cr)、NH_3-N平均质量浓度分别为10、60、10mg/L,浊度为5NTU,达到《污水再生利用工程设计规范》中规定的循环冷却系统补充水水质标准。当生产不正常,水质情况恶化时,要求处理后水质达到《合成氨工业水污染物排放标准》(GB 13458-2001)要求后外排,不会对环境造成严重污染。 相似文献
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《广州化工》2021,49(7)
针对羽绒水洗生产企业场地有限,采用"气浮-MBR"工艺进行了污水站技术改造。运行结果表明,在进水COD_(Cr)、BOD_5、SS分别为645 mg/L、208 mg/L、116 mg/L的情况下,出水COD_(Cr)、BOD_5、SS分别为20 mg/L、7.8 mg/L、13.3 mg/L,出水水质优于《羽绒工业水污染物排放标准》(GB21901-2008)表3相关标准中的要求,处理出水95%以上回用于车间再生产、厂内绿化、冲厕等。实际运行成本仅为0.6元/m~3,年节约水费37.6万元。实现了废水循环利用,对其它升级改造废水处理工程具有一定的参考意义。 相似文献
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针对甘肃某企业纺丝生产废水特点,采用铁炭微电解处理工艺,处理水量为1686 m3/d。工程运行结果表明,对COD_(Cr)、甲酸、SS的去除率分别可达到95.1%、98.8%、94%以上,其中进水COD_(Cr)平均值为962 mg/L、甲酸为157.08 mg/L、SS值为318 mg/L、pH值为3.2;出水平均值COD_(Cr)为47.1 mg/L、甲酸为1.81 mg/L、SS值为19.08 mg/L、pH值为7.2,出水水质满足化工类生产废水标准《污水综合排放标准》(GB8978-1996)第二类污染物最高允许排放浓度一级标准。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献