共查询到19条相似文献,搜索用时 234 毫秒
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研究臭氧 混凝沉淀处理低温微污染水的净水效果.采用静态试验,改变臭氧投加量,接触氧化时间等参数,分别对比了CODMn、浊度和色度的去除效果.臭氧投加量为3 mg·L-1接触氧化时间为15 min时,沉淀后出水的高锰酸盐指数、浊度、色度比直接采用聚合氯化铝混凝的去除率分别提高了5.4%、20.3%和20.1%.对于低温微污染水源水,臭氧 混凝沉淀工艺能有效地去除有机物、浊度、色度,使处理后水质达到饮用水水质标准. 相似文献
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针对黄河自来水的水质状况,试验采用混凝+机械过滤工艺预处理黄河自来水。通过单因素变量分析及正交混凝试验,以COD和浊度作为混凝效果的参照指标,试验确定了最佳混凝工艺:PAM最佳用量0.15 mg/L,PAC用量3.0 mg/L,混凝时间8 min,过滤速度8 m/h,其产水水质稳定并处理量较大。 相似文献
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选用适当的混凝、絮凝剂,针对药剂种类、用量、投加顺序以及溶液pH值等工艺参数,采用高浊度高色度水质(造纸废水)及低浊度低色度水质(自配水),对水的混凝、絮凝杯罐试验方法进行了研究.确定了该试验的试验装置、操作条件及操作步骤 相似文献
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水的混凝及絮凝杯罐试验方法的研究 总被引:7,自引:0,他引:7
选用适当的混凝、絮凝剂,针对药剂种类、用量、投加顺序以及加溶液pH值等工艺参数,采用高浊度高色度水质(造纸废水)及低浊度低色度水质(自配水),对水的混凝、絮凝杯罐试验方法进行了研究。确定了该试验的试验装置、操作条件及操作步骤。 相似文献
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针对农村饮水安全工程中存在的水源供水情况不理想、供水水质差、取水不便、供水量不足无法保证供给等问题,介绍了微涡旋混凝技术在宜春某水厂的应用情况。采用涡流反应器对穿孔旋流反应池进行改造,改造后处理规模由800m3/d提高至960m3/d,使沉淀池出水浊度维持在3NTU以下,滤后水浊度保持在1NTU以下,减少了13%的投药量,同时节约了21.4%的反冲洗水量。改造运行后的实践证明,微涡旋混凝技术具有操作简便、适应性好、投资少、运行费用低、见效快等优点,是适合我国现阶段农饮水工程中较为经济有效的能增大水厂产水量的一项技术,且能比较实用地提高出厂水的水质,具有一定的推广价值。 相似文献
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采用静态吸附和六联搅拌烧杯实验进行组合改性沸石粉(MZ)耦合粉末活性炭(PAC)强化混凝去除微污染源水氨氮(NH3-N)、耗氧量(CODMn)、UV254和浊度等效能研究。结果表明,组合改性后沸石粉的比表面积和平均吸附孔径增加,对NH3-N交换去除能力增强。MZ和PAC联用吸附对去除NH3-N具有协同作用,对去除CODMn略有拮抗作用。而MZ耦合PAC强化混凝则显著提高了NH3-N, CODMn, UV254和浊度的去除效果,出水NH3-N<0.5 mg/L, CODMn<3.0 mg/L, 浊度<1 NTU。MZ和PAC不同投加方式显著影响强化混凝处理效果,其中最佳投加方式为絮凝初期投加PAC和MZ,避免絮体包裹MZ,加强PAC对有机物的去除,进一步提高MZ对NH3-N的去除效果。耦合强化混凝使Zeta电位的绝对值降低,胶体间斥力减少,絮体粒径增大,粘黏现象明显,抗冲击能力更强。 相似文献
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低温低浊水具有低温、低浊、低耗氧量、低碱度等特点,使得低温低浊水处理一直是给水处理领域的一大难题.要想在低成本、低投入的前提下取得较好的出水水质,首先就要了解低温低浊水的水质特点,然后在此基础上,从水处理剂、处理技术以及处理工艺的选用方面进行优化筛选. 相似文献
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Bae-Bok Lee Kwang-Ho Choo Daeic Chang Sang-June Choi 《Chemical engineering journal (Lausanne, Switzerland : 1996)》2009,155(1-2):101-107
Optimal coagulation conditions need to be re-examined when coagulation is coupled to membrane filtration for wastewater treatment. This work focused on the optimization of coagulant dosing in order to control membrane fouling in ultrafiltration (UF), following coagulation for the reclamation of textile wastewater. The effects of pore size and coagulant types and dosages on flux decline were investigated using a stirred-cell UF unit. The flux was greatly enhanced for the UF membrane when a coagulant was added, whereas for the microfiltration (MF) membrane the flux decreased. This could be attributed to changes in the size of coagulated particles and their interaction with membrane pores. At a low dosage (e.g., 0.0371 mM as Al), the polyaluminum chloride (PACl) coagulant was found to control the flux decline most effectively for low ionic-strength wastewater. The optimal dose minimized the fouling and cake layer resistances, although it was sharp and dependent on influent composition. The cake layer protected the membrane from fouling, but it provided additional resistance to permeation. Analyses of turbidity, particle size, and membrane surface exhibited the characteristics of coagulated particles and their cake structures that are closely associated with flux behavior. 相似文献
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高效混凝沉淀技术在煤化工废水处理中的应用 总被引:5,自引:0,他引:5
介绍了高效混凝沉淀技术工艺,并将其应用于煤化工中产生的废水处理。工程实践证明,与传统澄清工艺相比,利用高效混凝沉淀技术对煤化工工业废水进行处理在占地、出水浊度、上升流速以及滤池反冲时间上均有较大的改善,具有明显的优势。 相似文献
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Philip C. Singer Christie Arlotta Nichole Snider-Sajdak Richard Miltner 《臭氧:科学与工程》2003,25(6):453-471
This study evaluated the impact of pre- and intermediate ozonation coupled with enhanced coagulation in controlling halogenated disinfection by-product formation in drinking water. Raw waters from utilities representing each of the nine elements of the enhanced coagulation matrix presented in Table I were examined. All testing was completed using bench-scale, batch experimental procedures. The various waters were analyzed for turbidity, total organic carbon, dissolved organic carbon, ultraviolet absorbance, trihalomethane formation potential, and haloacetic acid formation potential before and after ozonation. The results indicated that formation of trihalomethanes and haloacetic acids following enhanced coagulation decreased with both pre- and intermediate ozonation applications relative to the decreases observed by enhanced coagulation alone. The amount of trihalomethanes and haloacetic acids formed were lower for the waters that were pre-ozonated and then coagulated compared to those that were coagulated first and then ozonated. This comparison must be tempered by the fact that the settled waters treated by intermediate ozonation were not subjected to subsequent biofiltration which is commonly used in water treatment practice to remove additional DBP precursors. Strong correlations between disinfection by-product formation potentials and ultraviolet absorbance at 254?nm were observed for enhanced coagulation with and without pre- and intermediate ozonation. 相似文献
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聚二甲基二烯丙基氯化铵对聚合硫酸铁处理冬季长江水的助凝效果 总被引:1,自引:0,他引:1
采用聚二甲基二烯丙基氯化铵(PDM)与聚合硫酸铁(PFS)复合制得的稳定型复合混凝剂,用于冬季低温长江水强化混凝脱浊处理。通过混凝烧杯试验,考察了PDM对PFS在脱浊效果和沉淀性能上的改进程度。结果表明:对温度为5~7℃,浊度为45 NTU左右的冬季长江水,PDM助凝效果明显,同时PFS与PDM的复配比例越低,复合混凝剂混凝脱浊效果越好。复合混凝剂中PFS的用量比单独使用PFS时的少。复合混凝剂能增大絮团的沉淀速度,克服冬季低温条件下单独使用PFS时絮体轻而细小、沉淀慢、破碎现象严重的问题,从而使沉淀出水水质能够迅速稳定地达标,同时,还可明显改善PFS处理时出水带色、腐蚀设备等问题。 相似文献
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分别采用强化混凝和化学氧化方式,对生产废水回用引起的高浊和水生生物风险进行了应急试验研究。结果表明强化混凝应对生产废水回用高浊风险,具有高效、简易的技术优势。由于浊度物质具有再稳定特性,所需PAC投加量相对较高,在40mg/L以上。氯、二氧化氯和高锰酸钾均能对剑水蚤实现100%灭活,灭活效果由强到弱依次为ClO2〉Cl2〉KMnO4。从应急操作方便程度来说,预氯化更加便于推广采用,且工程中氯的投加量有望进一步降低。 相似文献