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光合细菌强化高浓度酵母废水厌氧生物处理效果研究 预览
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作者 李友明 薛宇慧 +2 位作者 葛广德 胡永玫 侯轶 《农业工程学报》 EI CAS CSCD 北大核心 2019年第9期214-220,共7页
高浓酵母废水的厌氧生物处理效率对废水处理系统的运行成本和经济可行性具有至关重要的作用。该文采用光合细菌强化厌氧污泥的方法处理酵母废水,考察了废水在厌氧处理前后的化学需氧量、色度变化以及光合细菌加入前后微生物的OTU分布、... 高浓酵母废水的厌氧生物处理效率对废水处理系统的运行成本和经济可行性具有至关重要的作用。该文采用光合细菌强化厌氧污泥的方法处理酵母废水,考察了废水在厌氧处理前后的化学需氧量、色度变化以及光合细菌加入前后微生物的OTU分布、厌氧污泥细菌的物种门类、污泥古菌聚类结果序列数量的变化。结果表明:光合细菌加入后,单段厌氧反应器处理酵母废水化学需氧量和色度去除率分别由原来的58.20%、47.50%显著提升至 75.12%和62.04%,光合细菌强化厌氧生物处理过程效果明显。微生物多样性分析发现在厌氧污泥驯化和添加光合细菌强化过程中,优势菌种不断累积,特异性增强,物种门类数目减少。光合细菌与其他异养细菌存在共生关系,加入光合细菌后污泥中产甲烷优势群落微生物明显增多,从而提高厌氧系统的处理效果。研究结果为高浓工业有机废水的有效处理提供了参考。 展开更多
关键词 废水 废水处理 光合细菌 厌氧处理工艺 微生物多样性
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醋酯废水除磷生产试验研究 预览
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作者 钱斐斐 曹红 +5 位作者 翟天兵 李晓东 司有银 严建 费晓东 朱丛静 《环境与发展》 2019年第1期94-96,共3页
本文在认真分析废水生化处理过程的基础上,结合开发低碱性除磷剂,研究开发醋酯废水化学法高效除磷工艺。结合减少调节用碱和醋酸等有机物在曝气过程中分解带来pH值上升等特点,化学法高效除磷工艺侧重于在混合废水经充分曝气处理后投放... 本文在认真分析废水生化处理过程的基础上,结合开发低碱性除磷剂,研究开发醋酯废水化学法高效除磷工艺。结合减少调节用碱和醋酸等有机物在曝气过程中分解带来pH值上升等特点,化学法高效除磷工艺侧重于在混合废水经充分曝气处理后投放低碱性除磷剂,在废水pH值8-9下生成沉淀,加酰胺类絮凝剂絮凝成污泥。生产试验表明,高效除磷工艺适合处理醋酯废水,在正常生产工况下,少加碱甚至不加碱,使用1.5‰左右的低碱性除磷剂,总磷去除率不低于82%,能够使废水总磷由40mg/L左右降至8mg/L左右;从试验情况看,增加除磷剂用量至2.5‰以上时,总磷去除率能够达到90%以上,能够使废水总磷降得更低,但除磷成本明显上升。开展化学法高效除磷工艺试验后,出水COD由试验前平均107.5mg/L下降至52.5mg/L,出水SS由均值89.3mg/L下降50.6mg/L,出水池水由淡褐色转为淡绿色。由此可见,化学法高效除磷工艺的运用将全面提高醋酯废水处理技术。 展开更多
关键词 醋酯 废水 低碱性除磷剂 化学法高效除磷工艺
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产蛋白酶耐铬菌株的筛选及应用研究
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作者 吴昱含 郭大鹏 +1 位作者 李帅鹏 李玉 《中国皮革》 CAS 2019年第6期59-63,67共6页
从废铬革屑长期堆积地的土壤中筛选耐Cr^3+产蛋白酶菌株,采用16SrDNA基因序列相似性分析鉴定菌株,并对菌株发酵产酶和耐铬特性进行分析。结果表明:菌株鉴定为蜡样芽孢杆菌,命名为B.cereus TCCC12102。菌株经37℃,200r/min发酵48h后碱性... 从废铬革屑长期堆积地的土壤中筛选耐Cr^3+产蛋白酶菌株,采用16SrDNA基因序列相似性分析鉴定菌株,并对菌株发酵产酶和耐铬特性进行分析。结果表明:菌株鉴定为蜡样芽孢杆菌,命名为B.cereus TCCC12102。菌株经37℃,200r/min发酵48h后碱性蛋白酶活性达到460.6U/mL。菌株可耐受Cr^3+的最大浓度为1.4g/L,碱性蛋白酶可耐受Cr^3+的最大浓度为2.0g/L.采集含铬污水进行实际作用效果分析,经48h处理,污水蛋白含量下降显著,清除率高达91.9%。本菌株具有高效处理含铬污水蛋白的作用,应进一步加强实际应用研究。本研究为制革行业含铬污水处理和蛋白资源合理利用提供了依据。 展开更多
关键词 蜡样芽孢杆菌 蛋白酶 污水 皮革 应用
低C/N摩尔比好氧反硝化菌的筛选及脱氮特性
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作者 胡杰 颜家保 +4 位作者 霍晓琼 吴玲 俞丹青 陈美玲 李超 《现代化工》 CAS CSCD 北大核心 2019年第5期128-132,共5页
从石化废水处理厂活性污泥中分离得到1株低C/N摩尔比的好氧反硝化菌株AD-7,通过形态学观察、生理生化试验及16S rD NA测序,确定其为假单胞菌属(Pseudomonas sp.)。通过单因素实验确定菌株适宜的好氧反硝化培养条件为:丁二酸钠为碳源、... 从石化废水处理厂活性污泥中分离得到1株低C/N摩尔比的好氧反硝化菌株AD-7,通过形态学观察、生理生化试验及16S rD NA测序,确定其为假单胞菌属(Pseudomonas sp.)。通过单因素实验确定菌株适宜的好氧反硝化培养条件为:丁二酸钠为碳源、培养温度为30~35℃、初始pH 6. 0~7. 0、摇床转速为150~200 r/min。在适宜的好氧反硝化培养条件下,研究了菌株生长情况与反硝化脱氮特性。结果表明,菌株生长与反硝化脱氮基本同步,并且在菌株培养12 h时,硝酸盐氮和总氮的去除率分别高达90. 47%和86. 06%,未出现亚硝酸盐氮的明显积累。因此,菌株AD-7能够通过完全反硝化实现总氮的有效脱除,在低C/N摩尔比废水脱氮方面具有潜在应用价值。 展开更多
关键词 废水 好氧反硝化 低C/N摩尔比 脱氮 假单胞菌
Photocatalysts for degradation of dyes in industrial effluents:Opportunities and challenges
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作者 Hassan Anwer Asad Mahmood +3 位作者 Jechan Lee Ki-Hyun Kim Jae-Woo Park Alex C.K.Yip 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第5期955-972,共18页
Discharging dye contaminants into water is a major concern around the world.Among a variety of methods to treat dye-contaminated water,photocatalytic degradation has gained attention as a tool for treating the colored... Discharging dye contaminants into water is a major concern around the world.Among a variety of methods to treat dye-contaminated water,photocatalytic degradation has gained attention as a tool for treating the colored water.Herein,we review the recent advancements in photocatalysis for dye degradation in industrial effluents by categorizing photocatalyst materials into three generations.First generation photocatalysts are composed of single-component materials (e.g.,TiO2,ZnO,and CdS),while second generation photocatalysts are composed of multiple components in a suspension (e.g.,WO3/NiWO4,BiOl/ZnTiOa,and C3N4/Ag3VO4).Photocatalysts immobilized on solid substrates are regarded as third generation materials (e.g.,FTO/WO3-ZnO,Steel/TiO2-WO3,and Glass/P-TiO2).Photocatalytic degradation mechanisms,factors affecting the dye degradation,and the lesser-debated uncertainties related to the photocatalysis are also discussed to offer better insights into environmental applications.Furthermore,quantum yields of different photocatalysts are calculated,and a performance evaluation method is proposed to compare photocatalyst systems for dye degradation.Finally,we discuss the present limitations of photocatalytic dye degradation for field applications and the future of the technology. 展开更多
关键词 PHOTOCATALYST DYE WASTEWATER DEGRADATION mechanism performance evaluation
Continuous flow removal of acid fuchsine by dielectric barrier discharge plasma water bed enhanced by activated carbon adsorption
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作者 Rusen Zhou Renwu Zhou +2 位作者 Xianhui Zhang Kateryna Bazaka Kostya (Ken) Ostrikov 《化学科学与工程前沿:英文版》 EI CAS CSCD 2019年第2期340-349,共10页
Continuous processes which allow for large amount of wastewater to be treated to meet drainage standards while reducing treatment time and energy consumption are urgently needed. In this study, a dielectric barrier di... Continuous processes which allow for large amount of wastewater to be treated to meet drainage standards while reducing treatment time and energy consumption are urgently needed. In this study, a dielectric barrier discharge plasma water bed system was designed and then coupled with granular activated carbon (GAC) adsorption to rapidly remove acid fuchsine (AF) with high efficiency. Effects of feeding gases, treatment time and initial concentration of AF on removal efficiency were investigated. Results showed that compared to the N2 and air plasmas treatments, O2 plasma processing was most effective for AF degradation due to the strong oxidation ability of generated activated species, especially the OH radicals. The addition of GAC significantly enhanced the removal efficiency of AF in aqueous solution and shorten the required time by 50%. The effect was attributed to the ability of porous carbon to trap and concentrate the dye, increasing the time dye molecules were exposed to the plasma discharge zone, and to enhance the production of OH radicals on/in GAC to boost the degradation of dyes by plasma as well as in situ regenerate the exhausted GAC. The study offers a new opportunity for continuous effective remediation of wastewater contaminated with organic dyes using plasma technologies. 展开更多
关键词 continuous REMOVAL dye-containing WASTEWATER dielectric barrier discharge plasma WATER BED activated carbon adsorption
Advances in Control Technologies for Wastewater Treatment Processes:Status, Challenges, and Perspectives 预览
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作者 Abdelhamid Iratni Ni-Bin Chang 《自动化学报:英文版》 CSCD 2019年第2期337-363,共27页
This paper presents a thorough review of control technologies that have been applied to wastewater treatment processes in the environmental engineering regime in the past four decades. It aims to provide a comprehensi... This paper presents a thorough review of control technologies that have been applied to wastewater treatment processes in the environmental engineering regime in the past four decades. It aims to provide a comprehensive technological review for both water engineering professionals and control specialists, giving rise to a suite of up-to-date pathways to impact this field in light of the classified technology hubs. The assessment was conducted with respect to linear control, linearizing control,nonlinear control, and artificial intelligence-based control. The application domain of each technology hub was summarized into a set of comparative tables for a holistic assessment. Challenges and perspectives were offered to these field engineers to help orient their future endeavor. 展开更多
关键词 Control TECHNOLOGIES system engineering WASTEWATER treatment
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Application of activated carbon-decorated polyacrylonitrile nanofibers as an adsorbent in dispersive solid-phase extraction of fluoroquinolones from wastewater 预览
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作者 K. Mogolodi Dimpe Philiswa N. Nomngongo 《药物分析学报:英文版》 CAS CSCD 2019年第2期117-126,共10页
A cheap and simple sample preparation method,consisting of a dispersive solid-phase method and an adsorbent,activated carbon decorated PAN nanofibers,was employed and used for the extraction of antibiotics (ciprofloxa... A cheap and simple sample preparation method,consisting of a dispersive solid-phase method and an adsorbent,activated carbon decorated PAN nanofibers,was employed and used for the extraction of antibiotics (ciprofloxacin,danofloxacin,and enrofloxacin) in wastewater.Electrospun PAN nanofibers that were decorated with activated carbon produced from waste tires were used as the solid phase and the antibiotics analyzed by using high-performance liquid chromatography.Parameters such as pH,mass of adsorbent (MA),extraction volume (EV),and extraction time (ET) were optimized owing to their potential effect on the extraction of antibiotics from water.The recovery of all antibiotics was satisfactory,in the range of 90%–99%.The limits of detection and quantification were 0.05,0.11,0.20,and 0.53,1.21,2.17 mg/L,respectively.The precision was determined from the repeatability and reproducibility and expressed as the intra-day (n=20) and inter-day (n=5) precision.The intra-day and inter-day precision was reported in terms of the percentage relative standard deviation,which was 3% and 4%,respectively.The adsorption capacity of the activated carbon-decorated PAN nanofibers was satisfactory,and the reusability of the adsorbent was impressive when reused ten times.The accuracy of the dispersive solid phase extraction (DSPE) was validated by spike recovery tests;the results proved the reliability and efficiency of adsorbing antibiotics from wastewater.Finally,the proposed method was applied to wastewater samples collected from a wastewater treatment plant,which included influent,secondary,and effluent wastewater. 展开更多
关键词 WASTEWATER NANOFIBERS Activated carbon ANTIBIOTICS POLYACRYLONITRILE
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二级化学沉淀-MBR工艺处理钎焊含氟废水 预览
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作者 徐龑 《节能与环保》 2019年第5期52-53,共2页
采用二级化学沉淀除氟-MBR工艺处理广州某汽车空调生产厂家在钎焊喷漆过程产生的废水。运行结果表明:当钎焊废水原水F、CODCr、氨氮和SS浓度分别为220、120、40、200mg/L时,经处理后的水质达到《污水综合排放标准》(GB8978-1996)一级标... 采用二级化学沉淀除氟-MBR工艺处理广州某汽车空调生产厂家在钎焊喷漆过程产生的废水。运行结果表明:当钎焊废水原水F、CODCr、氨氮和SS浓度分别为220、120、40、200mg/L时,经处理后的水质达到《污水综合排放标准》(GB8978-1996)一级标准和《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准:F、CODCr、氨氮和SS浓度分别不大于10、50、5、10mg/L。 展开更多
关键词 除氟 MBR 钎焊 废水
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Hybrid electric discharge plasma technologies for water decontamination:a short review
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作者 商克峰 李杰 Rino MORENT 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2019年第4期1-9,共9页
Electric discharge plasma(EDP)can efficiently degrade aqueous pollutants by its in situ gen erated strong oxidative species(OH,0,H2O2.O.etc)“nd other physiochemical effects(UV irradiation,shockwaves,local high temper... Electric discharge plasma(EDP)can efficiently degrade aqueous pollutants by its in situ gen erated strong oxidative species(OH,0,H2O2.O.etc)“nd other physiochemical effects(UV irradiation,shockwaves,local high temperature,etc),but a high energy consumptions limit the application of EDP in water treatment.Some adsorbents,catalysts,and oxida nts have been employed for en hanci ng the degradation of pollutants by discharge plasma.These hybrid plasma technologies offer improved water treatment performance compared to dischai'ge plasma alone.This paper reviews the water decontamination performance and mechanisms of these hybrid plasma technologies,and some suggestions on future water treatment technologies based on discharge plasma are also proposed. 展开更多
关键词 DISCHARGE PLASMA plasma/adsorbent plasma/catalyst plasma/oxidant WASTEWATER DECONTAMINATION
火力发电厂污泥改造方案探索 预览
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作者 谈姬伟 谈姬宏 《电力科技与环保》 2019年第3期43-45,共3页
为了实现污泥处理处置无害化、减量化、稳定化和资源化,诞生了多种污泥处理处置技术路线,其中利用电厂烟气余热将污泥干化后与电厂配煤焚烧相结合是比较经济且简单易行的技术路线。针对污泥处理处置的技术路线进行分析和总结,为污泥处... 为了实现污泥处理处置无害化、减量化、稳定化和资源化,诞生了多种污泥处理处置技术路线,其中利用电厂烟气余热将污泥干化后与电厂配煤焚烧相结合是比较经济且简单易行的技术路线。针对污泥处理处置的技术路线进行分析和总结,为污泥处理、处置技术的应用提供参考。进而以肇庆2×350MW电厂工程为例,介绍火力发电厂废水污泥处理系统的改造设计,提出污泥系统改造设计的方法,提出了相对安全的污泥系统改造方案。 展开更多
关键词 减量化 资源化 燃煤电厂 废水 污泥脱水 离心脱水机 污泥浓缩池
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硫化镍矿采选废水中重金属排放特征与防治对策 预览
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作者 李泽熙 赵志龙 +1 位作者 徐荣强 王芳 《价值工程》 2019年第19期244-246,共3页
硫化镍矿采选企业产生大量含重金属废水,外排造成地表水和地下水重金属污染。选取我国典型硫化镍矿采选企业,对其生产废水中的重金属含量进行检测分析,关心重金属包括镉、铬、铅、砷、汞、镍、钴、铜,确定每种重金属的污染负荷率,分析... 硫化镍矿采选企业产生大量含重金属废水,外排造成地表水和地下水重金属污染。选取我国典型硫化镍矿采选企业,对其生产废水中的重金属含量进行检测分析,关心重金属包括镉、铬、铅、砷、汞、镍、钴、铜,确定每种重金属的污染负荷率,分析得出采选废水中排放的重金属主要来源于尾矿库排水,重点防控的重金属依次为铜、镍、砷、铬、铅。针对含重金属废水提出可行的防治措施,为镍采选企业废水的重金属污染监管提供依据。 展开更多
关键词 硫化镍矿 废水 重金属
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含钼废水处理技术及其机理研究进展 预览
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作者 李梦阳 张亚雷 +1 位作者 沈峥 张勇 《环境污染与防治》 CAS CSCD 北大核心 2019年第1期106-109,共4页
钼是动植物体内必不可少的微量元素,但摄入过多会产生不良后果,中国许多地区已出现不同程度的钼污染。综述了含钼废水的主要处理技术化学沉淀法、离子交换树脂法、吸附法、膜分离法和生物法的去除效果、影响因素及去除机理等。最后总结... 钼是动植物体内必不可少的微量元素,但摄入过多会产生不良后果,中国许多地区已出现不同程度的钼污染。综述了含钼废水的主要处理技术化学沉淀法、离子交换树脂法、吸附法、膜分离法和生物法的去除效果、影响因素及去除机理等。最后总结了以上技术的优缺点,并展望了未来的发展方向,以期为含钼废水的处理提供借鉴。 展开更多
关键词 废水 处理技术 机理
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Pilot-scale experiments on multilevel contact oxidation treatment of poultry farm wastewater using saran lock carriers under different operation model
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作者 Tianlong Zheng Peng Li +4 位作者 Xiaoyu Ma Xiaohong Sun Chuanfu Wu Qunhui Wang Ming Gao 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第3期336-345,共10页
A pilot-scale multilevel contact oxidation reactors system, coupled with saran lock carriers,was applied for the treatment of poultry farm wastewater. The removal efficiencies of CODcr, ammonia, and the total nitrogen... A pilot-scale multilevel contact oxidation reactors system, coupled with saran lock carriers,was applied for the treatment of poultry farm wastewater. The removal efficiencies of CODcr, ammonia, and the total nitrogen as well as the elimination performance of CODcr and total nitrogen along the three-level contact oxidation tanks under six designed operational models were investigated. Based on the performance of the nitrogen removal of the saran lock carriers and the distribution of anoxic–aerobic interspace under the suitable operation model, the mechanism of nitrogen removal of the system was also explored. The results revealed that the intermittent aeration under parallel model is the most suitable operation model, while the removal efficiencies of CODcr, ammonia, and the total nitrogen were 86.86%, 84.04%, and 80.96%, respectively. The effluent concentration of CODcr,ammonia, and the total nitrogen were 55.6 mg/L, 8.3 mg/L, and 12.0 mg/L, which satisfy both the discharge standard of pollutants for livestock and poultry breeding industry(GB18596–2001) and the first grade of the integrated wastewater discharge standard(GB 8978–1996). Moreover, the mechanism for the nitrogen removal should be attributed to the plenty of anoxic–aerobic interspaces of the biofilm and the three-dimensional spiral structure of the saran lock carriers, where the oxygen-deficient distribution was suitable for the happening of the simultaneous nitrification and denitrification process. Therefore, the multilevel contact oxidation tanks system is an effective pathway for the treatment of the poultry farm wastewater on the strength of a suitable operation model and novel carriers. 展开更多
关键词 MULTILEVEL contact oxidation tanks Nitrogen removal Mechanism Operation model POULTRY FARM WASTEWATER Saran LOCK carriers
石墨烯复合材料在废水行业中的应用进展 预览
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作者 杜秉霖 田士东 +4 位作者 张生军 李克伦 王奕晨 张红星 谭晓婷 《山东化工》 CAS 2019年第14期81-83,共3页
石墨烯是从石墨材料中剥离出来,由碳原子组成的仅有一层原子厚度的二维晶体。它是目前已知材料中强度和硬度最高的材料,断裂强度是钢材的200多倍,同时它又具有良好的弹性,拉伸强度可达125 GPa。石墨烯的比表面积极高(理论上为2600 m~2/... 石墨烯是从石墨材料中剥离出来,由碳原子组成的仅有一层原子厚度的二维晶体。它是目前已知材料中强度和硬度最高的材料,断裂强度是钢材的200多倍,同时它又具有良好的弹性,拉伸强度可达125 GPa。石墨烯的比表面积极高(理论上为2600 m~2/g),具有优异的机械性能、电性能和热性能。利用石墨烯与其它材料进行复合可以获得具有优异性能的新型复合材料,进而在废水处理中发挥重要作用。 展开更多
关键词 石墨烯 复合材料 废水 吸附
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紫外分光光度法研究木质素及其系列酯处理含铬酸废水 预览
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作者 赵小红 韦建设 邓贵 《科学技术与工程》 北大核心 2019年第3期269-274,共6页
为了使木质素变废为宝,同时减轻日益严重的水污染问题,以木质素及其酯为吸附剂处理铬酸废水,以期实现以废治废的目的。通过紫外分光光度法研究了不同木质素及其酯处理铬酸废水的工艺和效果。结果表明:木质素处理铬酸废水的较佳工艺为木... 为了使木质素变废为宝,同时减轻日益严重的水污染问题,以木质素及其酯为吸附剂处理铬酸废水,以期实现以废治废的目的。通过紫外分光光度法研究了不同木质素及其酯处理铬酸废水的工艺和效果。结果表明:木质素处理铬酸废水的较佳工艺为木质素用量0.4g/100mL废水,溶液pH=2,45℃处理4h。碱木质素对铬酸根的吸附能力较强;酶解木质素、木质素马来酸酯、木质素丁二酸酯为吸附剂时,随着用量的增加,对铬酸根的吸附量增加。而木质素乙酯、木质素丙酯随着用量的增加,吸附量先减小后增加。木质素类型及酯化率差异导致木质素吸附铬酸根的吸附位点数不同,吸附铬酸根离子能力也不同。同类酯的吸附特征相似。木质素的吸附性能与其羟基含量和颗粒结构密切相关。 展开更多
关键词 木质素 木质素酯 铬酸 废水 吸附
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Adsorption recovery of Ag(I)and Au(III)from an electronics industry wastewater on a clay mineral composite 预览
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作者 Youness Rakhila Abdellah Elmchaouri +3 位作者 Allal Mestari Sophia Korili Meriem Abouri Antonio Gil 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第6期673-680,共8页
The aim of this work is to investigate the ability of an adsorbent of a clay mineral composite to remove and recover gold and silver ions from wastewater.The composite was prepared by mixing phosphogypsum(PG),obtained... The aim of this work is to investigate the ability of an adsorbent of a clay mineral composite to remove and recover gold and silver ions from wastewater.The composite was prepared by mixing phosphogypsum(PG),obtained from an industrial waste,and a natural clay mineral.The materials were characterized before and after use in adsorption by several techniques.Batch adsorption experiments were carried out,and the effects of the contact time and the pH and temperature of solution on the removal processes were investigated.The optimum pH for the adsorption was found to be 4.The adsorption of these metal ions reached equilibrium after 2 h of contact.The pseudo-first-and the pseudo-second-order kinetic models,as well as the Freundlich and the Langmuir isotherm equations,were considered to describe the adsorption results.The maximum adsorbed amount of 85 mg·g^-1 Ag(I)and 108.3 mg·g?1 Au(III)was found.The recovery of the adsorbed gold and silver ions from the adsorbent was also analyzed.Strong acids appeared to be the best desorption agents to recover gold and silver ions.The use of aqua regia gave regeneration rates close to 95.3%and 94.3%for Ag(I)and Au(III),respectively.Finally,the removal of gold and silver ions from an industrial wastewater was tested in batch experiments,and percentage recoveries of 76.5%and 79.9%for Ag(I)and Au(III),respectively,were obtained.To carry out the industrial application of the proposed methodology,an economic viability study is required. 展开更多
关键词 ADSORPTION CLAY COMPOSITE industrial WASTEWATER gold silver
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Stimulation impact of electric currents on heterotrophic denitrifying microbial viability and denitrification performance in high concentration nitrate-contaminated wastewater
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作者 Shuang Tong Hengyuan Liu +5 位作者 Chuanping Feng Nan Chen Yan Zhao Baocai Xu Jiamin Zhao Ming Zhu 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第3期363-371,共9页
Electric current stimulation has been shown to have a positive influence on heterotrophic denitrifying microbial viability and has the potential to improve wastewater denitrification performance. This study investigat... Electric current stimulation has been shown to have a positive influence on heterotrophic denitrifying microbial viability and has the potential to improve wastewater denitrification performance. This study investigated the effects of varying current densities on microbial activity and NO3- removal efficiency under heterotrophic conditions.NO3-removal rate was highest at an applied current density of 400 mA/m2. However, the optimum removal efficiency of total inorganic nitrogen(TIN;99%) was achieved when the current density was fixed at 200 m A/m2. Accumulation of NH4+-N and NO2--N byproducts were also minimized at this current density. The activity of heterotrophic denitrifying microorganisms was much higher at both 200 and 400 mA/m2. Moreover, the average adenosine-5′-triphosphate(ATP)content(an indicator of cell metabolism) at a current density of 1600 mA/m2 was lower than that under no current, indicating heterotrophic denitrifying microbial activity can be inhibited at high current densities. Hence, direct electrical stimulation on the activity of heterotrophic denitrifying microorganisms in the developed system should be lower than 1600 mA/m2. This study improves the understanding of electric current influence on heterotrophic denitrifying microorganisms and promotes the intelligent application of direct electrical stimulation on wastewater treatment processes. 展开更多
关键词 Direct electrical STIMULATION NITRATE removal DENITRIFICATION HETEROTROPHIC MICROBIAL activity Current density WASTEWATER treatment
超高效液相色谱-串联质谱法测定污水和污泥基质中的20种全氟及多氟化合物 预览
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作者 陈勇杰 张蓓蓓 +2 位作者 陈国松 赵永刚 王济奎 《分析化学》 SCIE EI CAS CSCD 北大核心 2019年第4期533-540,共8页
建立了适用于测定污水和污泥两种基质中全氟-多氟化合物(PFASs)的样品前处理方法和仪器检测方法,用于测定污水和污泥两种介质中20种PFASs:9种全氟羧酸(PFCAs)、3种全氟磺酸(PFSAs)、2种N-烷基全氟辛基磺酰胺乙醇(FOSEs)、2种N-烷基全氟... 建立了适用于测定污水和污泥两种基质中全氟-多氟化合物(PFASs)的样品前处理方法和仪器检测方法,用于测定污水和污泥两种介质中20种PFASs:9种全氟羧酸(PFCAs)、3种全氟磺酸(PFSAs)、2种N-烷基全氟辛基磺酰胺乙醇(FOSEs)、2种N-烷基全氟辛基磺酰胺(FOSAs)和4种氟调醇(FTOHs)。对于污水样品,采用WAX固相萃取小柱对样品进行净化及富集,WAX小柱活化上样后,分别用4 mL甲醇和3 mL甲醇(含0.5%(V/V)NH4OH)依次洗脱非离子型全氟化合物(FOSEs、FOSAs和FTOHs)和离子型全氟化合物(PFCAs和PFSAs),相应的洗脱液定容后,用液相色谱-质谱进行检测。对于污泥样品,采用加速溶剂萃取法,以乙腈为萃取剂对所有目标物进行萃取,萃取液经氮吹浓缩,过石墨化碳柱净化后检测。结果表明,水样和污泥样品中20种PFASs的平均加标回收率分别为62%~130%和71%~126%,相对标准偏差为0.9%~12.7%和0.4%~15.2%,方法定量限分别为0.24~4.32 ng/L和0.04~0.12 ng/g。本方法前处理简单,灵敏度高,重现性好,适用于工业污水及污泥基质中多种PFASs的同时检测。 展开更多
关键词 全氟化合物 N-烷基全氟辛基磺酰胺乙醇 N-烷基全氟辛基磺酰胺 氟调醇 污水 污泥
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折点氯化法除钨冶炼厂氨氮废水研究 预览
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作者 陈星宇 马鑫铭 +4 位作者 史明 唐忠阳 刘旭恒 黄少波 赵中伟 《中国钨业》 CAS 2019年第1期45-49,69共6页
钨冶炼过程中产生大量氨氮废水,直接排放对环境造成破坏。研究采用折点氯化法处理钨冶炼厂排放的氨氮废水,研究了反应时间、初始氨氮浓度、p H值、温度对于模拟废水的氨氮脱除效果的影响,以及折点氯化法工业化应用的效果。模拟氨氮废水... 钨冶炼过程中产生大量氨氮废水,直接排放对环境造成破坏。研究采用折点氯化法处理钨冶炼厂排放的氨氮废水,研究了反应时间、初始氨氮浓度、p H值、温度对于模拟废水的氨氮脱除效果的影响,以及折点氯化法工业化应用的效果。模拟氨氮废水试验结果表明,当pH值为11时,试验效果最好:在45 min后,反应到达折点,氨氮浓度降至5.3 mg·L^-1,氯气利用率在95%左右。而温度和初始浓度两个因素对氨氮脱除无明显影响。折点氯化法工业试验结果表明:不同浓度(801 800 mg·L^-1)的钨冶炼厂废水经过折点氯化法处理后,氨氮均能够降低到15 mg·L^-1以下,且到达折点时Cl2与NH3-N的质量比为7.8。 展开更多
关键词 折点氯化法 氨氮 废水 氯气利用率
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