共查询到20条相似文献,搜索用时 125 毫秒
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为探究氯离子(Cl-)对过一硫酸盐法(PMS)去除垃圾渗滤液中氨氮和难降解有机物的影响,通过改变Cl-浓度和氨氮浓度,采用常规水质指标分析及三维荧光光谱分析,对比了Cl-对PMS体系处理垃圾渗滤液中活性氯的累积生成情况、氨氮的转化影响和难降解有机物的去除效果。结果表明,在无氨氮时,Cl-可以增强垃圾渗滤液中有机物的降解效果;当初始氨氮浓度为60 mg/L,反应60 min时,垃圾渗滤液中氨氮的去除率可达90%以上,但UV254去除率从22.96%大幅下降9.27%,说明了Cl-的存在可以促进渗滤液中氨氮的转化但会影响芳香性有机物的去除效果。三维荧光分析结果进一步证明了Cl-可以降低PMS体系处理后垃圾渗滤液中有机物的腐殖化程度,但氨氮的存在会削弱高含氯垃圾渗滤液中腐殖质的去除效果。本文研究结果可为优化过一硫酸盐法处理高含Cl-垃圾渗滤液中氨氮与有机物提供理论基础。 相似文献
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为解决生活垃圾填埋场渗滤液系统的设计处理能力与实际需求不匹配,以及处理过程产生的膜浓缩液回灌等将引发一系列环境风险和隐患。以四川省某生活垃圾填埋场渗滤液处理改造项目为例,采用“两级A/O+两级Fenton+BAF”处理工艺,实现了渗滤液的“全量化”处理,有效避免了膜浓缩液的产生。运行结果表明,全量处理模式能有效提高渗滤液处理系统的处理效果和能力,保证渗滤液能及时有效排出,避免了渗滤液处理系统的膜液产生和回灌问题,从而缓解和改善填埋场存在的环境风险和隐患。 相似文献
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综述了Fenton与类Fenton氧化垃圾渗滤液的研究进展。Fenton法对垃圾渗滤液中难去除有机物尤其是腐殖酸有良好的降解效果。引入光、电、微波、超声波等的类Fenton法减少了药剂用量,提升了去除效果,非均相Fenton实现了催化剂的循环使用。并对Fenton及类Fenton法处理垃圾渗滤液的研究方向进行了展望。 相似文献
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采用沉淀-SBR-活性炭过滤复合工艺对城市垃圾渗滤液进行处理,确定混凝、SBR和活性炭过滤的最佳参数。结果表明,当进水CODcr 2500mg/L、氨氮在900mg/L的条件下,经该系统处理后,出水CODcr均在300mg/L以下,氨氮在20mg/L以下。CODcr去除率达90%以上,氨氮去除率达98%以上,达到去除有机物和氨氮的较好效果。 相似文献
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This study examined o-nitrophenol removal from aqueous solutions by electrochemical oxidation employing a modified electrode. The modified electrode was produced by electrodepositing lead oxide onto a titanium substrate. Following electrochemical oxidation of o-nitrophenol-containing solutions, the remaining o-nitrophenol concentration and chemical oxygen demand (COD) values were determined. The optimum parameters were current density of 40 mA cm(-2), pH of 2.47, 60 min of electrolysis time, 4 g L(-1) NaCl electrolyte solution and temperature of 30 degrees C. Under these optimum conditions of electrochemical degradation using a lead oxide/titanium modified electrode complete removal of o-nitrophenol and COD was achieved. 相似文献
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Pulp mill effluent was treated by different advanced oxidation processes (AOPs) consisting of UV, UV/H2O2, TiO2-assisted photo-catalysis (UV/TiO2) and UV/H2O2/TiO2 in lab-scale reactors for total organic carbon (TOC) and toxicity removals. Effects of some operating parameters such as the initial pH, oxidant and catalyst concentrations on TOC and toxicity removals were investigated. Almost every method resulted in some degree of TOC and toxicity removal from the pulp mill effluent. However, the TiO2-assisted photo-catalysis (UV/TiO2) resulted in the highest TOC and toxicity removals under alkaline conditions when compared with the other AOPs tested. Approximately, 79.6% TOC and 94% toxicity removals were obtained by the TiO2-assisted photo-catalysis (UV/TiO2) with a titanium dioxide concentration of 0.75gl(-1) at pH 11 within 60min. 相似文献
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Muftah H. El-Naas Sulaiman Al-Zuhair Amal Al-Lobaney Souzan Makhlouf 《Journal of environmental management》2009,91(1):180-185
Batch electrocoagulation experiments were carried out to evaluate the removal of sulfate and COD from petroleum refinery wastewater using three types of electrodes: aluminum, stainless steel, and iron. The effects of current density, electrode arrangement, electrolysis time, initial pH, and temperature were investigated for two wastewater samples with different concentrations of COD and sulfate. The experimental results indicated that the utilization of aluminum, as anode and cathode, was by far the most efficient arrangement in the reduction of both the contaminants. The treatment process was found to be largely affected by the current density and the initial composition of the wastewater. Although electrocoagulation was found to be most effective at 25°C and a pH of 8, the influence of these two parameters on the removal rate was not significant. The results demonstrated the technical feasibility of electrocoagulation as a possible and reliable technique for the pretreatment of heavily contaminated petroleum refinery wastewater. 相似文献
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Long-term consumption of water containing excessive fluoride can lead to fluorosis of the teeth and bones. Electrocoagulation (EC) is an electrochemical technique, in which a variety of unwanted dissolved particles and suspended matter can be effectively removed from an aqueous solution by electrolysis. Continuous flow experiments with monopolar aluminium electrodes for fluoride removal were undertaken to investigate the effects of the different parameters such as: current density (12.5-50A/m(2)), flow rate (150-400 mL/min), initial pH (4-8), and initial fluoride concentration (5-25mg/L). The highest treatment efficiency was obtained for the largest current and the removal efficiency was found to be dependent on the current density, the flow rate and the initial fluoride concentration when the final pH ranged between 6 and 8. The composition of the sludge produced was analysed using the X-ray diffraction (XRD) spectrum. The strong presence of the aluminium hydroxide [Al(OH)(3)] in the above pH range, which maximizes the formation of aluminium fluoride hydroxide complex [Al(n)F(m)(OH)(3n-m)], is the main reason for defluoridation by electrocoagulation. The results obtained showed that the continuous flow electrocoagulation technology is an effective process for defluoridation of potable water supplies and could also be utilized for the defluoridation of industrial wastewater. 相似文献
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In this study, two pilot-scale aerobic landfill reactors with (A1) and without (A2) leachate recirculation are used to obtain
detailed information on the quantity and quality of leachate in aerobic landfills. The observed parameters of leachate quality
are pH, chloride (Cl−), chemical oxygen demand (COD), biological oxygen demand (BOD), total Kjeldahl nitrogen (TKN), ammonia nitrogen (NH3-N), and nitrate (NO3–-N). pH values of the leachate increased to 7 after 50 days in reactor A1 and after 70 days in reactor A2. Cl− concentrations increased rapidly to 6100 (A1) and 6900 (A2) mg/L after 80 days, from initial values of 3000 and 2800 mg/L,
respectively. COD and BOD values decreased rapidly in the A1 landfill reactor, indicating the rapid oxidation of organic matter.
The BOD/COD ratio indicates that leachate recirculation slightly increases the degradation of solid waste in aerobic landfills.
NH3-N concentrations decreased as a result of the nitrification process. Denitrification occurred in parts of the reactors as
a result of intermittent aeration; this process causes a decrease in NO3− concentrations. There is a marked difference between the A1 and A2 reactors in terms of leachate quantity. Recirculated leachate
made up 53.3% of the leachate generated from the A1 reactor during the experiment, while leachate quantity decreased by 47.3%
with recirculation when compared with the aerobic dry landfill reactor. 相似文献
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以高锰酸钾溶液作为烟气中汞元素的氧化吸收液,通过单因素试验研究了氧化吸收液浓度、反应时间、初始汞浓度、反应温度、pH值对KMnO4对HHg0吸收效率的影响,阐明方法适应性,并将现行采样方法进一步优化.结果 表明,15min后,氧化吸收基本平衡,KMnO4浓度为5mmol/L,反应温度为60℃时KMnO4氧化吸收最佳.强... 相似文献
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高锰酸钾氧化技术是提高混凝工艺去除有机污染物的有效途径之一。与其他方法相比,采用高锰酸钾氧化法作为混凝工艺的前处理工艺具有反应速度快、处理效率高、适用范围广等优点。实验采用高锰酸钾强化混凝处理生化尾水,考察了高锰酸钾投加量、反应时间、反应pH以及不同混凝剂组合的因素的影响。结果表明,COD,TOC,UV254等污染物的去除率随着高锰酸钾投加量的增加而增加;在高锰酸钾投加量小于12 mg/L时,反应时间不应大于40 min;高锰酸钾对有机物的去除存在最优的pH,pH在6~7范围内,有机物去除率较高;高锰酸钾与不同混凝剂组合工艺相比于单独投加高锰酸钾或直接混凝剂混凝,COD去除率明显提高。高锰酸钾与聚合氯化铝组合混凝工艺对有机污染物的去除效果较其他组合工艺好。 相似文献
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不同物质对垃圾渗滤液中腐殖酸的吸附研究 总被引:1,自引:0,他引:1
垃圾渗滤液是一种有毒有害的高浓度有机废水,其中含大量腐殖酸。腐殖酸具有离子交换能力、吸附能力和脱除杂质能力,因此在很多方面有实用价值。活性碳、土壤、堆肥对废水中的有机物有一定的吸附能力。本文采用正交设计的方法,研究了活性碳、土壤、堆肥在不同温度,液/固,腐殖酸初始浓度的条件下对垃圾渗滤液中腐殖酸的吸附效果。实验结果表明:四种实验因素对吸附剂的吸附能力的影响程度为:吸附剂类型〉腐殖酸的初始浓度〉吸附反应温度〉液固比。在温度为25℃,液固比为50/0.5(mL/g),腐殖酸初始浓度为41.99(mg/L),吸附剂类型为活性碳时,腐殖酸吸附量最大,为40.86mg。同时分析了响应指标随因素的变化趋势。 相似文献
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三维电极电解硝基苯废水处理实验研究 总被引:4,自引:0,他引:4
以涂膜活性炭-活性炭为填充粒子,对三维电极电解硝基苯废水进行了研究。通过实验探讨了投盐量、槽电压、主电极间距、反应时间及初始浓度对电解硝基苯废水的影响。结果表明,三维电极在电极间距为9mm、槽电压为20V、硫酸钠投加量为1.5g/L、pH值为6、电解时间为90min的条件下,硝基苯去除率可达90%以上。在三维电极电解作用下,硝基苯转化为可生化和低毒的苯胺,苯胺在三维电极电解作用下还可以得到进一步的降解。 相似文献