共查询到19条相似文献,搜索用时 828 毫秒
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以涪陵页岩气田产出水为研究对象,研究絮凝、酸析、Fenton氧化和NaClO氧化相互协同作用下,采出水COD去除率的变化程度及规律。比较了不同组合方式下水样COD去除效果及变化规律,考察了絮凝剂、次氯酸钠和Fenton试剂的加量以及体系pH值对去除率的影响,结果表明:(1)单一絮凝或酸析条件下,最高COD去除率<25%,在絮凝剂加量80mg/L、酸析pH为4时,絮凝-酸析协同处理COD去除率达到>40%;(2)原始水样直接进行次氯酸钠氧化,COD最高去除率为75.01%,絮凝-酸析后进行次氯酸钠氧化,最高COD去除率为80.34%,与原始水样相比提高了5.33%,且达到相同的COD去除效果,絮凝-酸析后水样对次氯酸钠的需求量低于原始水样;(3)絮凝-酸析后水样进行Fenton氧化与原始水样直接进行Fenton氧化相比,COD去除率提高了6.07%;(4)絮凝-酸析-NaClO- Fenton协同处理,水样COD去除率达到>90%,其中最高去除为94.17%,与絮凝-酸析-NaClO和絮凝-酸析-Fenton处理相比分别提高了13.83%和5.27%。水样首先经过絮凝-酸析预处理,达到削减后续次氯酸钠和Fenton氧化负荷、降低药剂用量目的,然后经过Fenton试剂和次氯酸钠对不同类型特征污染物选择性去除的协同作用,可达到较高的COD去除率。 相似文献
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以涪陵页岩气田产出水为对象,研究絮凝、酸析、次氯酸钠(NaClO)和Fenton氧化联合处理产出水COD的去除规律,考察了絮凝剂、NaClO、Fenton试剂的加量以及体系pH值对去除率的影响。研究结果表明:单纯絮凝或酸析处理的COD去除率<25%,絮凝-酸析处理COD去除率>40%;絮凝-酸析后再进行NaClO氧化最高COD去除率为80.34%,比原始水样直接NaClO氧化提高了5.33%,对NaClO的需求量低于直接NaClO氧化,并能达到相同的COD去除效果;絮凝-酸析后水样进行Fenton氧化与原始水样直接Fenton氧化相比,COD去除率提高了6.07%;絮凝-酸析-NaClO-Fenton联合处理COD去除率>90%,最高为94.17%,比絮凝-酸析-NaClO和絮凝-酸析-Fenton分别提高了13.83%和5.27%。页岩气产出水经絮凝-酸析预处理,能达到削减后续NaClO和Fenton氧化负荷、降低药剂用量的目的,再经过Fenton试剂和NaClO对不同类型特征污染物选择性去除的联合作用,可达到较高的COD去除率。 相似文献
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《中国环境管理干部学院学报》2017,(6)
采用臭氧高级氧化技术对某染料废水进行处理,探究不同条件对染料废水COD以及色度的去除效果的影响,确定最佳工艺条件。在最佳条件下,采用单独臭氧、单独紫外、臭氧-紫外、臭氧-双氧水以及臭氧-铁炭五种氧化方法对染料废水进行处理。结果表明:臭氧氧化技术最佳条件为pH值=8,臭氧流量80 L/h,反应时间为2 h;采用最佳处理方案,采用臭氧-紫外高级氧化技术处理染料废水,其脱色率为98.3%,COD去除率为67.0%。 相似文献
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王晓雯 《中国环境管理干部学院学报》2014,(6):66-68
分别用三种不同的酸消解方法进行土壤标准样品的前处理,用原子吸收分光光度法测定其中铜、铅、锌、镉、镍、锰、总铬元素的含量。结果表明,电热板/硝酸-过氧化氢-氢氟酸消解方法耗酸量少,消解时间短,适用于土壤中铜、铅、锌、镉、镍、锰元素的前处理,相对标准偏差为1.0%~5.0%;而使用电热板/硝酸-硫酸-氢氟酸方法针对土壤中总铬元素进行消解前处理,准确度更高,相对标准偏差为2.7%~5.1%。 相似文献
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PAC和PASS对印染废水的混凝效果研究 总被引:5,自引:0,他引:5
主要研究PAC和PASS混凝剂对高浓度和低浓度印染废水的混凝处理效果。确定了PAC处理高浓度印染废水(pH:4.39;色度:18750倍;COD:6480;浊度:1462)的最佳pH、混凝时间、投药量为5~7、8min、24mL/L;PASS处理低浓度印染废水(pH:10.16;色度:2020倍;COD:168;浊度:36.4)的最佳pH、混凝时间、投药量为6~7、15min、12mL/L。PAC处理高浓度的印染废水效果较好,处理低浓度印染废水的效果较差;PASS处理低浓度印染废水的处理效果比PAC要好。 相似文献
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为了研究车载巡回处理装置对小城镇垃圾渗滤液的处理效果,采用自制的UV-Fenton试验装置研究了pH值、FeSO_4剂量、反应时间等因素对处理效果的影响,结果表明:最佳pH值为4.0,进水中COD为825 mg/L时,FeSO_4和H_2O_2的投加量分别为0.008 mol/L和0.08 mol/L,此时COD去除率72.22%,出水COD为216 mg/L;随着FeSO_4投加量缓慢增加到一定程度后转而下降,FeSO_4最佳投加量为0.008 mol/L;不同H_2O_2和Fe~(2+)配比对COD去除效果具有影响,(10:1)时为最佳配比。经过氨吹脱和混凝沉淀预处理的渗滤液采用UV/Fenton处理工艺,出水中COD可以达到《生活垃圾填埋场污染控制标准》(GB 16889-1997)中二级标准。 相似文献
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本文研究了混凝—催化臭氧化对垃圾渗滤液MBR出水COD、UV254和色度的去除效果及可生化性能的影响。在pH 11,FeCl3用量800 mg/L的优化条件下,COD、UV254和色度去除率分别为37.8%、61.9%和88.7%。混凝出水催化臭氧化结果表明,3%-Ce/AC催化臭氧化效率最好,COD去除率为33.6%,臭氧消耗系数为1.40 mgO3/mgCOD。经混凝—催化臭氧化处理后,MBR出水的COD、UV254及色度总去除率分别为58.7%、90.8%及98.7%,BOD5/COD从0.036提高到0.375,可生化性明显改善。 相似文献
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酸催化氧化法处理含对苯二酚废水的方法 总被引:3,自引:0,他引:3
本文主要研究用硫酸作催化剂,30%过氧化氢作氧化剂,再经过pH值的调节和活性炭吸附,使对苯二酚化学需氧量值从3615mg/L降至260mg/L。化学需氧量的去除率高达93.3%。 相似文献
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Abdul Saboor Samiullah Khan Aamer Ali Shah Fariha Hasan Haji Khan 《International Journal of Green Energy》2017,14(7):632-637
It is well known that dilute sulfuric acid pretreatment of the lignicellulosisc biomass is an effective approach used for the production of the ethanol. However, there are less studies on the biogas production from the pretreated lignocellulosics and hardly data available on the codigestion of cattle manure with the pretreated lignocellulosisc material. The aim of this study was to evaluate biomethane production potential of codigestion of cattle manure with dilute acid pretreated lignocellulosic biomass. Sugarcane bagasse and rice husk was pretreated with dilute sulfuric acid or phosphoric acid at 121°C for 20 minutes and subsequently subjected to anaerobic digestion alone or codigested with cattle manure.The results showed that codigestion of 1% phosphoric acid pretreated rice husk with cattle manure led to the highest methane production of 115 Nmlg?1VS while monodigestion of cattle manure and phosphoric acid pretreated rice husk produced 98 and 87 Nmlg?1VS, respectively. An inhibition was observed in anaerobic digestion of sulfuric acid pretreated rice husk and sugarcane bagasse during monodigestion and codigestion with cattle manure.The study concludes that dilute phosphoric acid pretreated lignocellulosics like sugarcane bagasse and rice husk can be used as a cosubstrate with cattle manure in anaerobic digestion for enhanced methane production. Dilute sulfuric acid pretreatment, which is effective method for the bioethanol production, causes inhibition during anaerobic digestion of the pretreated lignocellulosics. 相似文献
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为改进现有二滩库区垃圾处理填埋场垃圾渗滤液处理工艺,研究絮凝—吸附法预处理工艺,试验以聚合氯化铝作为絮凝剂,最佳投放量为600mg/L,以粉煤灰作为吸附剂,最佳投放量为200g/L。结果表明:CODcr去除率达到79.64%;NH3-N去除率达到83.23%;悬浮物去除率达到58.75%;色度去除率达到92.56%;重金属离子去除率为60.37%~96.33%;研究证明:渗滤液经预处理后可以与城市生活污水合并处理。 相似文献
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精制棉蒸煮清洗废水(黑液)色度高,成分复杂,属于难处理高浓度有机废水。采用“物化-生化”工艺对其进行处理,BOD、COD、色度、SS去除率分别为95.42%、96.58%、98.25%、70.00%,工程运行稳定,处理费用约为1.93元/m^3。 相似文献
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木糖生产废水的脱色研究 总被引:2,自引:0,他引:2
实验表明用臭氧化法进行木糖生产废水的脱色处理效果颇佳。在30分钟内就能达到90%的去除率,反应速度受pH、温度等因素影响较小。实验同时表明,臭氧氧化法对COD的去除效果不理想,需要和其它方法结合处理。 相似文献
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This study aims to investigate the treatment of paper mill effluents using electrocoagulation. Removal of lignin, phenol, chemical oxygen demand (COD) and biological oxygen demand (BOD) from paper mill effluents was investigated at various current intensities by using different electrodes (Al and Fe) and at various electrolysis times (1.0, 2.5, 5.0 and 7.5min). It was observed that the experiments carried out at 12V, an electrolysis time of 2min and a current intensity of 77.13mA were sufficient for the removal of these pollutants with each electrode. The removal capacities of the process using an Al electrode were 80% of lignin, 98% of phenol, 70% of BOD, and 75% of COD after 7.5min. Using an Fe electrode the removal capacities were 92%, 93%, 80% and 55%, respectively. In addition, it was found that removal of lignin, phenol, BOD and COD increased with increasing current intensity. In the experiments carried out at different current intensities, higher removal can be explained through a decrease in intra-resistance of solution and consequently an increase at the transfer speed of organic species to electrodes. It was also found that Al electrode performs higher efficiency than Fe electrode except for COD removal. However, the time required for removal of BOD was more than that of COD. The results suggest that electrocoagulation could be considered as an effective alternative to paper mill effluents treatment. 相似文献