人工湿地在造纸废水处理中的应用前景

简述了人工湿地的概念、特征及分类,阐述了人工湿地处理造纸废水的机理,并以山东省沾化齐明纸业有限公司为例,介绍了人工湿地系统处理造纸废水的运行效果及效益分析,可为相似企业合理有效利用人工湿地系统提供借鉴。分析了人工湿地处理造纸废水的优势和存在的问题,展望了人工湿地用于处理造纸废水在我国的应用前景。     

造纸废水处理新思路一入工湿地系统

简述了人工湿地的概念、特征及分类,阐述了人工湿地处理造纸废水的机理。并以山东省沾化齐明纸业有限公司为例,介绍了人工湿地系统处理造纸废水的运行效果及效益分析,展望了人工湿地用于处理造纸废水在我国的应用前景。     

造纸废水处理新思路——人工湿地系统

简述了人工湿地的概念、特征及分类,阐述了人工湿地处理造纸废水的机理。并以山东省沾化齐明纸业有限公司为例,介绍了人工湿地系统处理造纸废水的运行效果及效益分析,展望了人工湿地用于处理造纸废水在我国的应用前景。     

造纸废水处理新思路一人工湿地系统

简述了人工湿地的概念、特征及分类,阐述了人工湿地处理造纸废水的机理。并以山东省沾化齐明纸业有限公司为例,介绍了人工湿地系统处理造纸废水的运行效果及效益分析,展望了人工湿地用于处理造纸废水在我国的应用前景。     

人工湿地处理造纸废水的应用前景

综述了人工湿地处理废水的一般原理和人工湿地类型及其特点，然后结合国内已有的人工湿地处理造纸废水案例，分析了人工湿地处理造纸废水的优势和存在的问题，展望了人工湿地用于处理造纸废水在我国的应用前景。     

造纸废水的人工湿地处理工艺分析

从应用实例出发,总结和分析了造纸废水的溶解氧和微生物强化人工湿地处理工艺以及生物法-人工湿地和化学氧化-人工湿地等组合人工湿地处理工艺的优缺点;针对目前造纸废水人工湿地处理中存在的占地面积较大和容易堵塞等主要问题,根据国内外研究动态,提出了造纸废水人工湿地处理研究及应用的发展方向以及人工湿地处理造纸废水的优化模式。     

人工湿地系统在造纸废水净化处理中的应用

为了提高造纸废水的净化处理效果,使造纸厂的出水水质满足工业要求,提出了人工湿地系统在造纸废水净化处理中的应用。选择风车草、富贵竹和芦苇作为人工湿地植物,以无烟煤为主要基质,模拟人工湿地系统净化处理造纸废水。结果表明,与风车草和芦苇相比,富贵竹在人工湿地系统中对造纸废水中COD、总磷、总氮和色度的去除能力都是最好的,将富贵竹与无烟煤组合在一起,可以提高造纸废水中COD、总磷、总氮的去除率,降低造纸废水的色度,通过人工湿地系统中植物与基质的协同作用,能够增强造纸废水中污染物的去除效果,提高造纸厂的出水质量,使其满足工业要求。     

造纸废水在人工湿地生态处理的构建及其降解动力学探索

国际上通常把森林、海洋和湿地并称为全球三大生态系统。构建大规模的由人工建造和控制运行的人工(仿自然)类似的沼泽综合人工湿地生态系统,借助人工湿地生态系统微生物菌类及湿地植物,对造纸废水中有机污染物(尤其是难降解的木质素)等进行降解,实现造纸废水净化,是目前造纸废水深度处理的一种经济技术可行的工艺。本文通过对造纸废水经人工湿地系统处理的水质参数进行测定分析及湿地植物在造纸废水作用下的生长情况进行实验,以COD为参数指标,对其降解动力学进行探讨。     

造纸废水的人工湿地处理研究进展

综述了造纸废水人工湿地处理的环境影响以及造纸废水人工湿地处理中植物、微生物及工艺的研究和应用现状,分析了人工湿地技术在造纸废水处理上的优势,提出了该技术有待深入研究的方向.     

造纸废水的人工湿地处理研究进展

综述了造纸废水人工湿地处理的环境影响以及造纸废水人工湿地处理中植物、微生物及工艺的研究和应用现状,分析了人工湿地技术在造纸废水处理上的优势,提出了该技术有待深入研究的方向.     

我国造纸工业废水深度处理的技术现状及其发展趋势

主要介绍了目前我国造纸工业废水深度处理的混凝、吸附、高级氧化、膜分离与膜生物反应器(MBR)工艺、磁混凝沉淀与磁化-仿酶催化缩合工艺、氧化塘、人工湿地等主要技术的现状,并分析了其发展趋势.     

浅谈污水处理与水环境保护中人工湿地技术应用

人工湿地是指模拟自然湿地的结构和功能,人为地将低污染水投配到由填料/土壤等与水生植物、动物和微生物构成的独特生态系统中,并通过物理、化学和生物等协同作用使水质得以改善的水质净化提升工程.目前,大部分高标准污水处理系统使用的都是污水处理厂+人工湿地技术,这种技术不仅具有成本低、运行与维护简单等特点,同时还可以有效处理污水,使水质达到很好的提升效果因此,在提升水质与水生态修复中得到了广泛使用.本文详细介绍了人工湿地的净化原理,并且分析了其具体应用.     

Buffering of alkaline steel slag leachate across a natural wetland

Buffering of high-pH (>12) steel slag leachate is documented across a small, natural calcareous wetland. The alkaline leachate is supersaturated with respect to calcite upstream of the wetland (Sl(calcite) values +2.3) and becomes less saturated with progress across the wetland, to Sl(calcite) values of +0.27 at the wetland outlet. Reduction in pH across the wetland (to around pH 8 at the wetland outlet) was observed to be more pronounced over summer months, possibly due to increased microbial activity, possibly further assisted by greater flow baffling by emergent vegetation. Calculated calcite precipitation rates downstream of the leachate source, estimated from hydrochemical data, flow, and surface area, were on the order of 0.4-15 g m(-2) day(-1), while direct measurements (using immersed limestone blocks) showed calcite precipitation values in the range 3-10 g m(-2) day(-1). Precipitation rate was highest in the pH range where the carbonate ion is a dominant constituent of sample alkalinity (pH 9.5-11) and at the locations where wetland biota became established downstream of the leachate emergence. These data provide valuable insights into the potential for using constructed wetlands for the passive treatment of high pH steel slag leachates.     

Organic phosphorus sequestration in subtropical treatment wetlands

Diffuse phosphorus pollution is commonly remediated by diverting runoff through treatment wetlands to sequester phosphorus into soil layers. Much of the sequestered phosphorus occurs in organic forms, yet our understanding of its chemical nature is limited. We used NaOH-EDTA extraction and solution 31P NMR spectroscopy to speciate organic phosphorus sequestered in a large treatment wetland (STA-1W) in Florida, USA. The wetland was constructed on previously farmed peat and was designed to remove phosphorus from agricultural runoff prior to discharge into the Everglades. Unconsolidated benthic floc that had accumulated during the 9-year operation of the wetland was sampled along transects through two connected cells dominated by cattail (Typha dominigensis Pers.) and an additional cell colonized by submerged aquatic vegetation, including southern water nymph (Najas guadalupensis(Spreng.) Magnus) and coontail (Ceratophyllum demersum L.). Organic phosphorus was a greater proportion of the sequestered phosphorus in the cattail marsh compared to the submerged aquatic vegetation wetland, but occurred almost exclusively as phosphate diesters and their alkaline hydrolysis products. Itwas therefore markedly different from the organic phosphorus in mineral soils, which is dominated typically by inositol phosphates. Phosphate diesters are readily degradable in most soils, raising concern about the long-term fate of organic phosphorus in treatment wetlands. Further studies are now necessaryto assess the stability of the sequestered organic phosphorus in response to biogeochemical and hydrological perturbation.     

人工湿地系统处理化机浆废水小试研究

针对某化机浆厂 SBR 生化出水,采用小试规模的模拟人工湿地系统研究了不同基质和有无植物对废水中污染物的去除效果.选取了生物陶粒、无烟煤和页岩三种基质,并且对其进行两两组合,同时利用处理效果最好的基质生物陶粒构建了有无植物(风车草)的对照组湿地.研究表明:(1)三种不同基质对污水有不同的处理效果,其中生物陶粒对 COD...     

Nitrogen removal in a small constructed wetland: an isotope mass balance approach

The nitrogen (N) removal potential of constructed wetlands is increasingly used to lower the N load from agricultural nonpoint sources to inland and coastal waters. To determine the removal efficiency and key factors limiting wetland N removal, N fluxes were studied in a small constructed wetland in Central Switzerland. With an isotope mass balance approach integrating the natural isotope signature of nitrate (NO3-, ammonium (NH4+), and particulate nitrogen (PN), the N transformations such as assimilation, mineralization, nitrification, and denitrification were quantified. On average, the wetland removed 45 g m(-2) yr(-1) N during the studied 2.5 years, corresponding to a removal efficiency of 27%. Denitrification contributed 94% to the N removal, while only 6% of the removed N accumulated in the sediments. Denitrification was most efficient during periods with an oxic water column overlying anoxic sediments, as NH4+ released during mineralization of sediment organic matter was completely nitrified and subsequently denitrified at the sediment-water interface. During water column anoxia, NH4+ accumulated in the water and fueled assimilation by duckweed and internal recycling. The NO3-N isotope signature in the wetland mainly reflected the mineralization of sediment organic matter and subsequent nitrification, while denitrification at the sediment-water interface produced no fractionation.     

Performance of a constructed wetland with a sulfur/limestone denitrification section for wastewater nitrogen removal

The effectiveness of a nonvegetated lab-scale subsurface flow constructed wetland for wastewater treatment had been evaluated with the feed ammonium concentration of approximately 20-40 mg of NH4(+)-N L(-1) and a hydraulic retention time of approximately 10 d. The present system had a nitrification zone plus a sulfur/limestone (S/L) autotrophic denitrification zone followed by an anaerobic polishing zone and was operated with and without aeration. The wetland had only 80% organics removal and no net nitrogen removal when there was no artificial aeration. However, almost 100% organics removal and approximately 81-90% total inorganic nitrogen (TIN = NH4(+)-N + NO2(-0-N + NO3(-)-N) removal were achieved when the oxic zone of the system was aerated with compressed air. S/L autotrophic denitrification contributed 21-49% of total NO3(-)-N removal across the whole wetland and 50-95% across the S/L column. TIN and NH4(+)-N in the effluent were always < 5.5 and < 0.7 mg L(-1), respectively, when the feed had NH4(+)-N < or = 35 mg L(-1). Sulfate removal of approximately 53-69% was achieved in the anaerobic polishing zone. The position of the S/L column was changed (1.78, 2.24, and 2.69 m from the inlet), and no remarkable difference in nitrogen removal was observed. However, without the S/L column, TIN removal decreased to approximately 74%, and the effluent NO3(-)-N increased about two times (9.13 mg of N L(-1)). The present study has demonstrated the possible use of S/L autotrophic denitrification for nitrate removal in a constructed wetland.