VDI 4320 Blatt 3-2017由德国机械工程师协会 DE-VDI 发布于 2017-01。
VDI 4320 Blatt 3-2017在国际标准分类中归属于: 13.040.20 环境空气。
This standard describes the special requirements for the determination of the bulk deposition and the wet deposition in water soluble anions and cations. The application of the standard allows the determination of water soluble anions (e.g. chloride, nitrite, nitrate, potassium, calcium and magnesium). Depending on the measurement task also further water soluble ions can be determined. Depending on the site and on the analyte different measurement results can be gained with the different sampling types. Typical application areas are: background measurements to study the long range transport of air pollution, measurements in the context of authorisation procedures for plants (e.g. TA Luft or FFH protected areas), control of the effectiveness of emission reductions or traffic related measurements. The sampling procedures described in this standard can also be used for the determination of metals and metalloids in atmospheric deposition at background sites (rural and less contaminated urban sites) with high precipitation (e.g. determination of As, Cd, Pb and Ni according to DIN EN 15841 e.g. for reporting to the European Commission). Analysis methods for further elements are described in VDI 2267 Part 2. Species which are undissolved in the sample are not covered by described method. The general requirements regarding type, layout, positioning and exposition of the sampling systems are described in VDI 4320 Part 1.
按照污泥含有的主要成分不同,污泥可分为有机污泥和无机污泥。一般来说阳离子聚丙烯酰胺用于处理有机污泥,阴离子聚丙烯酰胺用于处理无机污泥,碱性很强时不易用阳离子聚丙烯酰胺,而酸性很强时不宜用阴离子聚丙烯酰胺,污泥的固含量高时通常聚丙烯酰胺的用量较大。 ...
②加入电解质防止发生絮凝,起这种作用的电解质称为反絮凝剂.电解质作絮凝剂应在试验的基础上加以选择.五、混悬剂的质量评价:微粒大小的测定、沉降容积比的测定、絮凝度的测定、重新分散试验、流变学测定混悬剂的物理稳定性评定指标如下:(一)微粒大小测定(二)沉降体积比测定沉降体积比 是指沉降物的容积与沉降前混悬剂的容积之比.值愈大,表示沉降物的高度愈接近混悬剂高度,混悬剂愈稳定.口服混悬剂(包括干混悬剂)沉降体积比应不低于...
夏季没有散煤燃烧采暖造成的污染,而该市主要的燃煤烟气设备都有有效的颗粒物减排措施,虽然大气中的二氧化硫和氨能合成二次颗粒物,可大气中二氧化硫的浓度也不高啊!暴雨也把地里的氨大部分都带走了啊!大气中不可能有这么多的氨气啊?怎么说,颗粒物的增长也不应该这么快啊!我曾经在一个企业调查时用肉眼就清晰地发现,某大型燃煤设施经湿式镁法脱硫后的烟气中的水雾蒸发了之后,仍拖着一缕长长的淡淡的蓝烟。...
但实验证明,在保证磷酸根的去除率没有降低的前提下,用阳离子聚合物代替无机絮凝剂可以取得同样的除磷效果,这说明聚合物参与了对阴离子磷酸根的吸附。例如某废水处理场在混凝处理工艺中,用12mg/L硫酸铁和3mg/L高电荷密度的阳离子聚合物,以及0.2mg/L高分子量的阴离子聚合物复合,代替原来23mg/L的硫酸铁,在磷的去除率不变的情况下,使出水BOD5去除率从30%上升到了55%。...
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