共查询到19条相似文献,搜索用时 718 毫秒
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《中国给水排水》2010,(8)
Actiflo Carb工艺是法国威立雅公司开发的一种粉末活性炭投加和Actiflo高密度沉淀池相结合的工艺,由混凝、熟化、斜板沉淀以及微砂循环系统组成。微砂加重絮凝工艺是Acti-flo高密度沉淀池最大的特点。微砂可以成为絮凝体的核心,提高沉淀速度,增强沉淀性能。另外,微砂可以增加接触反应表面积,克服由于低温、低浊引起的絮凝困难。粉末活性炭的投加量与其种类有关,还与去除有机物的种类和数量相关。该工艺高效且布置紧凑,适用于饮用水处理,尤其是地表水。试验证明,Actiflo Carb工艺能够去除水中50%~60%的溶解性有机碳,是一种优于臭氧活性炭滤池的饮用水深度处理工艺。 相似文献
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沉淀——超滤组合工艺处理微污染黄河水的中试研究 总被引:1,自引:0,他引:1
采用沉淀-超滤组合工艺,以黄河微污染水源水作为原水进行了试验研究,并与水厂常规工艺进行了对比.试验结果表明,沉淀-超滤组合工艺运行稳定后,对浊度的去除效果非常显著,出水浊度为0.07~0.09 NTU;对藻类有显著的去除效果,出水中未检测出藻类;在高密度沉淀池投加3 mg/L粉末活性炭后,组合工艺能有效去除CODMn,出水CODMn≤3 mg/L;高密度沉淀池对氨氮的去除率为30%,组合工艺总去除率为54%;在未投加任何消毒剂的情况下,工艺出水细菌基本为零,能保证很高的微生物安全性. 相似文献
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以中置式高密度沉淀池为载体,向池内投加粉末活性炭,利用高密度沉淀池的污泥回流系统对粉末活性炭进行富集和回用,延长其在沉淀池中的停留时间,考察投加粉末活性炭后对有机物的强化去除效果,并进行了投炭量优化研究。结果表明:该投加方式能显著改善对有机物的去除效果,相比不投加炭,对CODMn的去除率提高了近10%。通过增加污泥回流比可减少投炭量,在去除率相同的情况下,污泥回流比为5%时的投炭量较回流比为3%时减少了34%,而较不回流投炭方式减少了77%。对有机物的去除效果是粉末活性炭吸附和生物强化共同作用的结果。 相似文献
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粉末活性炭吸附去除松花江原水中有机物的研究 总被引:6,自引:1,他引:5
以松花江水为原水,通过小试和生产性试验研究了粉末活性炭吸附、混凝沉淀、过滤工艺对硝基苯及有机污染物的去除情况。结果表明:投加粉末活性炭很好地控制了有机物的总含量,混凝沉淀、过滤工艺主要使有机物的种类明显减少;投加粉末活性炭是去除环境优先控制有机物的关键措施;松花江水中的硝基苯投加量与检出量虽然存在一定的差异,但两者仍具有良好的线性关系;采用助凝措施强化粉末活性炭吸附去除水中硝基苯的效果不明显,说明硝基苯的去除主要是依靠粉末活性炭的吸附作用。 相似文献
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针对饮用水水质标准提高、常规工艺对污染严重的源水处理效果欠佳以及传统沉淀池局限性等问题,进行了以中置式高密度沉淀池为核心的全流程组合工艺中试研究。中置式高密度沉淀池的最佳工况是:污泥回流比为1%,聚合氯化铝投量为40 mg/L,助凝剂PAM的投量为0.15 mg/L。粉末活性炭的最佳投量为20 mg/L,此时对CODMn的去除率为41.1%。在各组合工艺中,"中置式高密度沉淀池/砂柱/臭氧柱/活性炭柱/超滤膜"为最优工艺流程。该组合工艺的出水浊度为0.02 NTU,CODMn为1.99 mg/L,UV254为0.021 cm-1,氨氮为0.19 mg/L,出水水质满足《生活饮用水卫生标准》(GB 5749—2006)要求。此外,在投资有限、用地紧张的条件下,也可采用"粉末活性炭/中置式高密度沉淀池/超滤膜"工艺。 相似文献
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混凝沉淀/PAC吸附/超滤工艺处理引黄水库冬季原水 总被引:3,自引:1,他引:2
采用混凝沉淀/粉末活性炭吸附/超滤工艺(简称PAC-UF工艺)处理黄河下游引黄水库冬季原水,中试结果表明:当处理冬季低温低浊水时,聚合氯化铝的最佳投量为6 mg/L,粉末活性炭的最佳投量为20 mg/L;PAC-UF工艺可以将出水的浊度控制在0.1 NTU以下,去除率达98%以上;投加20 mg/L的粉末活性炭能使混凝沉淀/UF工艺对COD_(Mn)和UV_(254)的平均去除率分别提高12%和15%;同时,投加粉末活性炭还能够缓解超滤膜的不可逆污染,但缓解的程度有限. 相似文献
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论文提出饮用水标准提高后斜管沉淀工艺优化应在水厂设计优化的条件下进行。斜管沉淀工艺在新的条件下具有适应性。斜管沉淀工艺优化应充分考虑前后工艺的影响。斜管沉淀的设计负荷应适当降低;斜管区结构采用双(多)层斜管,充分发挥斜管体的沉淀能力;斜管断面形式应优选,采用缺角正方形斜管等性能优异的斜管。斜管沉淀优化还应考虑构筑物平面布置、斜管搁置方向、与絮凝池衔接方式,以及施工和运行管理。 相似文献
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V形斜板强化接触絮凝沉淀技术利用设备的流体上升流道截面差造成水流沿重力方向的速度差,使斜板沉淀单元内部形成一定厚度的具有自我更新能力的絮体动态悬浮层,同时通过增设的垂直板来增加絮体悬浮层厚度,实现强化接触絮凝、提高絮体沉淀分离性能的目的.中试结果表明,当斜板长为850 mm、斜板间距为25 mm、直板长为150 mm时,沉淀设备达到最佳性能;在处理水量超过设计负荷的20%时,设备仍运行效果良好.在水厂改造项目中,V形斜板沉淀设备的出水浊度稳定在0.4 NTU以下,低于原设备的出水浊度(1.63 NTU),同时节省了49%的投药量. 相似文献
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通过对粉末活性炭吸附特性的研究,探讨了活性炭工艺去除饮用水中甲基对硫磷和对硫磷有机磷农药的可行性。用Freundlich公式拟合吸附等温线的数据,并用来估算活性炭的吸附容量和最大投加量。试验结果表明,向甲基对硫磷、对硫磷浓度分别为0.22,0.06mg/L的配水中投加10mg/L粉末活性炭,吸附时间20min时两者的去除率为93.66%~98.11%。针对南方某水厂原水,试验所确定的活性炭最佳投加量为1.5~2.0mg/L。试验证明投加粉末活性炭是去除饮用水中甲基对硫磷和对硫磷的有效方法。 相似文献
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粉末活性炭强化处理京杭运河常州段微污染原水 总被引:1,自引:0,他引:1
以京杭运河常州段微污染原水为研究对象,对其进行常规处理的同时增投粉末活性炭(PAC),通过静态吸附试验考察了最佳的投炭点和投加量.结果表明,投炭点在净水工艺流程中越靠前,则PAC对污染物的吸附效果越好;增投粉末活性炭可大幅度提高对有机污染物的去除效果;粉末活性炭的最佳投加点为吸水井,最佳投量为30 mg/L. 相似文献
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Design and evaluation of hydraulic baffled-channel PAC contactor for taste and odor removal from drinking water supplies 总被引:1,自引:0,他引:1
Based on the concept of hydraulic flocculator, a baffled-channel powdered activated carbon (PAC) contactor, placed before the rapid-mixing basin, was designed and evaluated for removal of taste and odor (T&O) in drinking water. PAC adsorption kinetic tests for raw water samples were conducted for selection of design parameters related to contact time and degree of mixing. Within the tested range of velocity gradient (G) from 18 to 83s(-1), mixing had a relatively minor effect on the adsorption kinetics of the PAC. The hydrodynamic characteristics of the pilot-scale horizontally and vertically baffled-channel PAC contactor were investigated by tracer tests. It was found that the plug flow fractions of vertically baffled-channel PAC contactor (vBPC) were higher than those of the horizontally baffled-channel PAC contactor (hBPC) for the same bend width or bend height. However, the hBPC seems to be more appropriate than the vBPC in terms of construction and maintenance. The geosmin and MIB removal rate increased with the number of baffles, PAC dose and contact time increased regardless of bend width in the pilot-scale hBPC. The pair of full-scale hBPCs at Pohang water treatment plant, having a design capacity of 6.5x10(4)m(3)/d with 20min of hydraulic retention time with a safety factor of 2, was designed based on lab- and pilot-scale experimental results. Under a velocity gradient of 20s(-1), the number of baffles to be installed was calculated to be 20 with a space of about 2m between each baffle, resulting in a hydraulic head loss through the contactor of about 0.056m. The successful application of hBPC for T&O removal from drinking water supplies should provide momentum for developing more effective treatment methods. 相似文献
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Branched pore kinetic model analysis of geosmin adsorption on super-powdered activated carbon 总被引:1,自引:0,他引:1
Yoshihiko Matsui Naoya Ando Hiroshi Sasaki Taku Matsushita Koichi Ohno 《Water research》2009,43(12):3095-3103
Super-powdered activated carbon (S-PAC) is activated carbon of much finer particle size than powdered activated carbon (PAC). Geosmin is a naturally occurring taste and odor compound that impairs aesthetic quality in drinking water. Experiments on geosmin adsorption on S-PAC and PAC were conducted, and the results using adsorption kinetic models were analyzed. PAC pulverization, which produced the S-PAC, did not change geosmin adsorption capacity, and geosmin adsorption capacities did not differ between S-PAC and PAC. Geosmin adsorption kinetics, however, were much higher on S-PAC than on PAC. A solution to the branched pore kinetic model (BPKM) was developed, and experimental adsorption kinetic data were analyzed by BPKM and by a homogeneous surface diffusion model (HSDM). The HSDM describing the adsorption behavior of geosmin required different surface diffusivity values for S-PAC and PAC, which indicated a decrease in surface diffusivity apparently associated with activated carbon particle size. The BPKM, consisting of macropore diffusion followed by mass transfer from macropore to micropore, successfully described the batch adsorption kinetics on S-PAC and PAC with the same set of model parameter values, including surface diffusivity. The BPKM simulation clearly showed geosmin removal was improved as activated carbon particle size decreased. The simulation also implied that the rate-determining step in overall mass transfer shifted from intraparticle radial diffusion in macropores to local mass transfer from macropore to micropore. Sensitivity analysis showed that adsorptive removal of geosmin improved with decrease in activated carbon particle size down to 1 μm, but further particle size reduction produced little improvement. 相似文献