共查询到17条相似文献,搜索用时 187 毫秒
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探讨预氧化-混凝沉淀法快速去除水中砷污染物的可行性,结果表明,在氧化时间均为10min条件下,KMnO4投加量为0.5mg/L时,聚氯化铝和聚合硫酸铁投加量分别为8mg/L和16mg/L时,可将原水中《生活饮用水卫生标准》(GB5749—2006)限值5倍浓度的砷降低到限值以下,去除率约90%。NaClO投加量(以有效氯计)为0.8mg/L时,聚氯化铝和投加量分别为8mg/L和20mg/L时,可将原水中《生活饮用水卫生标准》(GB5749—2006)限值5倍浓度的砷降低到限值以下,去除率约85%。以聚氯化铝为混凝剂的除砷效果优于聚合硫酸铁,以KMnO4氧化剂的除砷效果略优于NaClO。 相似文献
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针对春季嘉陵江重庆主城段水体中针杆藻突发增长、堵塞净水厂滤池的问题,采用硫酸铝或聚合氯化铝与聚合硫酸铁混合投加的强化混凝方法,研究了不同混凝剂联用条件下对针杆藻的去除效果,并根据取得的最佳投加量参数进行生产性试验。结果表明,联合投加20 mg/L的硫酸铝与30 mg/L的聚合硫酸铁能有效提高对针杆藻的去除效果,另外,实际生产中使用双层滤料相比单层滤料可以延长滤池的运行周期。 相似文献
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预氧化-化学沉淀法去除水中砷的试验研究 总被引:1,自引:0,他引:1
研究了预氧化-化学沉淀法对水中砷的去除效果及其影响因素。结果表明,原水砷质量浓度为5倍标准限值时,在NaClO预氧化条件下,投加8 mg/L的聚合氯化铝可使砷去除率达到84%,且出水砷含量可以满足《生活饮用水卫生标准》(GB 5749—2006)限值要求;在KMnO4预氧化条件下,投加8 mg/L的聚合氯化铝可使砷去除率达到90%,且出水砷含量满足标准限值要求,而投加8 mg/L的聚合硫酸铁可使出水砷含量降至18.72μg/L,无法满足标准限值要求;采用聚合氯化铝作为混凝剂时的除砷效果优于聚合硫酸铁,以KMnO4作为预氧化剂时的除砷效果优于NaClO。 相似文献
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研究了NaClO降解双酚A(BPA)的效能与机理。结果表明,在不同的NaClO投加量下,当pH值为9. 0~10. 0时可获得较佳的BPA降解效果,根据NaClO和BPA在水溶液中的形态分布可知,HClO与BPA-和BPA2-的反应速率要远快于BPA。当pH值为9. 5时,随着NaClO投加量从1. 0 mg/L增至10. 0 mg/L,BPA和TOC去除率均大幅升高。另外,通过检测BPA降解产物对其降解路径与机理进行了分析。当NaClO投加量较低时,BPA去除率较高、而TOC去除率较低,此时以氯的取代反应为主;随着NaClO投加量的增加,取代反应转变为氧化反应,发生开环和进一步降解;当NaClO投加过量时,会生成更多TCM和TCAA等消毒副产物(DBPs)。试验表明,适量NaClO可有效降解BPA,并抑制DBPs的生成,在特定浓度下可实现30 s的快速作用。 相似文献
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采用混凝沉淀-Fenton催化氧化组合工艺对蒽醌染整废水进行处理,研究了混凝剂和Fenton试剂投加量以及各种反应条件对处理效果的影响。试验结果表明,当pH值为6.2、A12(SO4)3投量为300mg/L、PAM投量为3mg/L、沉淀时间为30min时,混凝沉淀出水的COD为233~260mg/L,色度为15~20倍;后续处理采用Fenton试剂催化氧化,当FeSO4投量为200mg/L、H2O2投量为100mg/L、pH值为5.0、反应时间为30min时,出水色度≤10倍,BOD5≤10mg/L,COD≤50mg/L。 相似文献
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污水厂出水经紫外线(UV)消毒后在排放过程中会出现微生物的复活现象,为此考察了采用UV-氯和UV-过氧乙酸(PAA)控制光复活的效果。经研究发现:在UV照射剂量为5.4mJ/cm^2、投氯量为2.5mg/L、反应时间为10min和UV照射剂量为5.4mJ/cm^2、过氧乙酸投量为10mg/L、反应时间为10min的条件下,对大肠菌群的灭活率均可达4个对数级以上,并能控制光复活现象。从消毒稳定性、经济适用性、安全毒副性等方面考虑,可采用UV—PAA作为污水厂出水消毒及抑制光复活的技术。 相似文献
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采用自行设计的混凝沉淀/微滤一体化装置对长江(重庆段)原水进行净水处理,比较了不同混凝剂投加量下的处理效果。试验结果表明,聚合氯化铝(PAC)的适宜投加量范围为25~30mg/L;在增加PAC投量(30~40mg/L)的强化混凝条件下连续运行,对浊度、氨氮、CODMn和UV254的去除率分别可达100%、(55%~64%)、(40、6%~50.7%)、(67%~74.6%)。在连续运行的前12个周期内,微滤膜的过滤性能缓慢下降,J/J0降低到95.8%,此后膜过滤性能保持稳定。混凝沉淀/微滤工艺处理效果好,出水水质稳定,适宜处理长江(重庆段)原水。 相似文献
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新生态铁锰氧化物混凝除磷效果研究 总被引:1,自引:2,他引:1
采用FeSO_4和KMnO_4反应制备新生态铁锰氧化物除磷,比较了Fe_2(SO_4)_3和FeSO_4/KMnO_4两种混凝工艺的除磷效果,并考察了FeSO_4/KMnO_4除磷过程中的影响因素.结果表明,在相同条件下,FeSO_4/KMnO_4的除磷效果比Fe_2(SO_4)_3的要好,当铁盐投量(以Fe计)为5mg/L时,FeSO_4/KMnO_4和Fe_2(SO_4)_3对磷的去除率分别为90.2%和82.3%;KMnO_4与FeSO_4的最佳物质的量比为0.33;FeSO_4/KMnO_4的除磷效果随Fe~(2+)投量的增加而升高,随初始TP浓度和pH的增加而降低;当混凝时间由10 min增至60 min时,FeSO_4/KMnO_4对磷的去除率无明显变化. 相似文献
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A combination of surfactant solubilization with permanganate oxidation of trichloroethylene (TCE) was studied in batch, flow-through column, and three-dimensional (3-D) tank tests. Batch results showed that chloride production, an indication of TCE degradation, followed a pseudo-first-order reaction kinetics with respect to KMnO4 in the presence of free-phase TCE. A higher chloride production rate was achieved when anionic surfactants were present. The observed pseudo-first-order reaction rate constant increased as the concentrations of anionic surfactants Ninate 411 and Calfax increased from 0% to 0.1%, 0.3%, and 1.0%. Column experiments on TCE reduction by permanganate in the presence and absence of surfactants were carried out using well-sorted coarse Ottawa sand. The peak effluent TCE concentration reached 1700 mg/L due to enhanced solubilization when both sodium dodecyl sulfate (SDS) and permanganate were used, in contrast to less than 300 mg/L when only permanganate solution was used. In addition, the effluent TCE concentration decreased much faster when SDS was present in the permanganate solution, compared with the case when SDS was absent. With an initial 1 mL of TCE emplaced in the columns, the effluent TCE concentration dropped to <5mg/L after 29-31h of flushing with 1% SDS and 0.1% KMnO4 solution in contrast to 37-73 h when only 0.1% KMnO4 was used. Furthermore, KMnO4 breakthrough occurred after 21-25 h of injection when SDS was present compared with 45-70 h later when SDS was absent. A slightly higher chloride concentration was observed in the earlier stage of the column experiment and the chloride concentration decreased quickly once KMnO4 was seen in the effluent. The 3-D tank test showed that the MnO2 precipitation front formed more quickly when 1% SDS was present, which further confirmed the observation from the column study. 相似文献
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Nur Koçberber Kιlιç Pιnar Karacakaya Ergin Duygu Gönül Dönmez 《Water and Environment Journal》2012,26(1):94-99
Phenol removal levels of Synechocystis sp. were investigated in BG11 media with 10 mg/L triacontanol (TRIA) and without it to test whether the hormone could increase the removal efficiency by increasing biomass. The assays were performed to determine the effect of light on degradation, in media with 119.0–492.8 mg/L phenol under light and dark conditions. At increasing phenol concentrations, the degradation ranged between 98.5 and 100% regardless of a dark or a light condition. Experiments were carried out under light to determine the optimum pH for effective degradation. Optimum pH was found to be 6.5 at 200 mg/L phenol with or without TRIA. Phenol degradation was investigated in the 120.2–826.9 mg/L range. Although 377.4 mg/L phenol was completely degraded in hormone controls within 120 h, degradation was increased by TRIA, and the process was completed in 96 h. These data suggest that Synechocystis sp. has potential for use in the treatment of wastewaters containing phenol. 相似文献
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针对饮用水除锰问题,对比研究了次氯酸钠(NaClO)、二氧化氯(ClO2)和高锰酸钾(KMnO4)3种氧化剂预处理后与超滤组合的除锰效果和膜污染特性。结果表明,3种组合工艺均能有效去除Mn2+,出水Mn2+浓度均在5μg/L以下,去除率达到99%以上。超滤膜表面的滤饼层是造成膜污染及膜通量快速下降的重要原因之一。扫描电镜(SEM)分析发现,不同氧化剂预处理后膜表面的滤饼层形态有显著不同,KMnO4预处理后滤饼层颗粒较大,颗粒间的空隙较为明显;而ClO2和NaClO预处理后滤饼层颗粒细小且含量少,颗粒间的空隙不明显,从而形成较为致密的滤饼层。由X射线光电子能谱(XPS)和傅里叶变换红外光谱(FT-IR)分析可知,滤饼层的主要成分是Mn3+和Mn4+的混合物,滤饼层表面含有丰富的表面羟基,其对水中游离的Mn2+表现出极强的配位吸附作用。 相似文献