共查询到19条相似文献,搜索用时 140 毫秒
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针对仪化热电厂将循环水用作冲灰水,导致浓缩倍率只有1.6,以及凝汽器铜管腐蚀结垢严重等问题,提出了隔断循环水与冲灰水的直接联系,实现闲路循环,对凝汽器铜管进行酸洗,并对循环水实施加缓蚀阻垢荆、杀菌剂和旁流过滤等办法,全部实施后产生了很好的效益,值得借鉴。 相似文献
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采用自制聚丙烯中空纤维疏水膜,开展了内压式真空膜蒸馏处理某气田采出水的实验研究,考察了膜通量、脱盐率、产水电导率及产水水质等随运行时间的变化,针对实验后期出现的膜污染情况对膜蒸馏浓水除硬后进行二段膜蒸馏,再对出水进一步做催化臭氧氧化处理。实验结果表明:105 h后,废水中各离子浓度随着废水的浓缩而急剧升高,同时废水的高硬度造成膜堵塞,产生膜污染;除硬后去除了膜结垢污染,改善了膜疏水性能,膜通量恢复到初始膜通量的73%;膜蒸馏出水经催化臭氧氧化处理后,出水COD、TOC和ρ(NH4+-N)分别为49 mg/L、6.5 mg/L和11.0 mg/L,满足回用要求。 相似文献
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电镀等金属表面处理废水,因含有有害金属离子,必须除去后才能排放。最常用的除去有害金属离子的方法是化学沉淀法,废水经化学药品处理后,有害金属离子生成不溶性化合物,从水中析出。如何使已析出的固相迅速有效地与水分离,是关系到废水能否合格排放,污泥能否不再流失的大问题。从水中析出的金属化合物,最初都以极细的胶体微粒出现,由于微粒的双电层作用,吸附大量水分子,故难以进行固液分离。通常采用逐级分离方法,如澄清-浓缩-脱水;气浮-脱水;沉淀-气浮-脱水等组合工艺法。但这类工艺都不能彻底除尽悬浮物,由于悬浮颗粒的存在,取样分析时酸化即成金属离 相似文献
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《化工环保》2007,27(3)
用活化无机复合催化材料循环净化染料废水该发明公开了一种用活化无机复合催化材料循环净化染料废水的方法。其处理工艺为:(1)将活化无机复合催化材料加入吸光度为0.20~3.00的染料工业废水中,活化无机复合催化材料的用量按活化无机复合催化材料质量∶染料工业废水体积=0.5~20g∶100mL加入,搅拌吸附、催化反应5~60min;(2)将上述饱和吸附后的活化无机复合催化材料离心过滤脱水、烘干,于200~700℃下再活化焙烧0.5~4.0h,得再生活化无机复合催化材料;将再生后的活化无机复合催化材料用于步骤(1),重复步骤(2),对染料工业废水进行循环催化处理、脱… 相似文献
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高压电晕-臭氧协同作用处理难降解有机废水技术进展 总被引:5,自引:1,他引:4
利用高压电晕-臭氧的协同作用来处理废水是一项新技术。高压电晕和臭氧均能在水溶液中产生·OH。·OH能无选择地氧化有机污染物如苯乙酮、石炭酸、对氯苯酚等,处理效率高、无二次污染。高压电晕产生的紫外线和高能电子能促进臭氧产生·O和·OH,臭氧气泡的局部放电使电晕产生更多的·OH,二者联用具有很好的协同性。因此该技术在难降解有机废水的处理方面具有较大的优越性。 相似文献
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活性炭催化臭氧氧化处理低浓度氨氮废水 总被引:1,自引:0,他引:1
采用活性炭催化臭氧氧化法处理低浓度氨氮废水,考察了模拟废水pH、活性炭加入量、臭氧流量等因素对处理效果的影响.实验结果表明:活性炭对臭氧有明显的催化作用,并可提高臭氧的利用率;在高pH条件下,OH-能促进臭氧分解生成·OH,·OH氧化性强且反应速率快,有利于氨氮的去除;增大臭氧流量可减小气液传质过程中的阻力,使氨氮去除率增加;在初始氨氮质量浓度为35 mg/L、活性炭加入量为10.0 g/L、臭氧流量为30 mg/min、模拟废水pH为11.0的条件下,反应90 min后,氨氮去除率可达97.6%,相对于单独活性炭吸附和臭氧氧化过程,氨氮去除率有了显著提高. 相似文献
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In this study, ozone treatment was used to improve the surface wettability of waste tire rubber (WTR) powders. Fourier transform
infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) were performed in order to characterize the surface composition
of the treated samples. The progress of surface modification was also monitored by contact angle measurements of different
test liquids (water and liquid paraffin). The surface energy values were evaluated in terms of the Owens’ method and the contact
angle data were compared with the results obtained by the surface analytical methods (i.e. FTIR and XPS measurements). These
results showed that ozone treatment lead to a remarkable decrease in water contact angle owing to the implantation of oxygen-containing
functional groups. Using XPS and FTIR, the oxygen-containing groups can be identified as C–O, O–C=O and C=O. With prolongation
of ozone treatment time, WTR exhibited increasing oxygen-containing groups, surface energy and wettability. 相似文献
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将磷霉素生产盐渣经水解得到右旋磷霉素二钠,再通过亲核取代反应得到可用作循环冷却水阻垢剂的氨基二乙基(1-甲基-2-羟基)膦酸四钠(ADMHP·Na4),并用FTIR表征了产物结构.实验结果表明:在取代反应温度为25℃、取代反应时间为2h、n(氨水)∶n(右旋磷霉素二钠)=8的条件下,由右旋磷霉素二钠制备ADMHP·Na4,收率可达83.87%.处理1t盐渣可创造利润3 080元.当ADMHP·Na4质量浓度为30 mg/L,水样温度为60℃时,ADMHP·Na4对CaCO3的阻垢效果较好,阻垢率可达91.47%. 相似文献
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Gallagher M. W. Beswick K. M. McFiggans G. Coe H. Choularton T. W. 《Water, Air, & Soil Pollution: Focus》2001,1(5-6):233-242
Air-sea exchange rates for ozone were measured by the eddy correlation technique at a site on the north Norfolk coast in the UK. The average surface resistance to ozone uptake was found to be, rs(O3) = 1,000 ± 100 s m-1. Micrometeorological measurements of trace gas fluxes to ocean surfaces are rare but a review of available measurements suggests that we can constrain sea water surface resistance for ozone to between 1,000 (Regener (1974), and this work) and 1,890 s m-1 (Lenschow et al., 1982), yielding surface deposition velocities between 0.53 and 1.0 mm s-1. These values are more than an order of magnitude greater than can be explained by laboratory determined mass accommodation coefficients for ozone to water. The importance of dry deposition with respect to process air-sea exchange models is highlighted. A trend in surface deposition velocity with wind speed was also observed supporting a surface chemical enhancement mechanism of ozone uptake which in turn is enhanced by near surface mixing processes. 相似文献