Lyles School of Civil Engineering, Purdue University, 550 Stadium Mall Drive, West Lafayette, Indiana, USA 47907.
School of Materials Engineering, Neil Armstrong Hall of Engineering, 701 West Stadium Avenue, West Lafayette, IN, USA 47907-2045.
Environ Sci Process Impacts. 2020 Sep 23;22(9):1828-1841. doi: 10.1039/d0em00190b.
The in situ manufacture of cured-in-place-pipe (CIPP) plastic liners in damaged sewer pipes is an emerging mobile source of anthropogenic air pollution. Evidence indicates volatile organic compounds (VOCs) can be released before, during, and after manufacture. The chemical composition of a popular uncured styrene-based CIPP resin was examined, along with the VOCs that remained in the new cured composite. The roles of curing temperature and heating time in waste discharged into the air were examined. Uncured resin contained approximately 39 wt% VOCs. Multiple hazardous air pollutants were present, however, 61 wt% of the uncured resin was not chemically identified. A substantial mass of VOCs (8.87 wt%) was emitted into the air during manufacture, and all cured composites contained about 3 wt% VOCs. Some VOCs were created during manufacture. Curing temperature (65.5-93.3 °C) and heating time (25-100 min) did not cause different composite VOC loadings. High styrene air concentrations inhibited the detection of other VOCs in air. It is estimated that tens of tons of VOCs may be emitted at a single CIPP manufacturing site. Regulators should consider monitoring, and potentially regulating, these growing mobile air pollution and volatile chemical product sources as they are operating in urban and rural areas often in close proximity to residential and commercial buildings.
原位制造现场固化管道（CIPP）塑料衬里在受损污水管道中是人为空气污染源的新兴移动源。有证据表明，挥发性有机化合物（VOC）可在制造前、制造中和制造后释放。本文研究了一种流行的未固化苯乙烯基 CIPP 树脂的化学成分，以及新固化复合材料中残留的 VOC。还研究了固化温度和加热时间对排放到空气中的废物的作用。未固化树脂含有约 39wt%的 VOC。存在多种有害空气污染物，但未固化树脂中有 61wt%未被化学鉴定。在制造过程中，大量 VOC（8.87wt%）排放到空气中，所有固化复合材料都含有约 3wt%的 VOC。在制造过程中会产生一些 VOC。固化温度（65.5-93.3°C）和加热时间（25-100 分钟）不会导致复合材料的 VOC 负载量不同。高浓度的苯乙烯空气会抑制空气中其他 VOC 的检测。据估计，在单个 CIPP 制造现场可能会排放数十吨 VOC。监管机构应考虑监测这些不断增长的移动空气污染源和挥发性化学产品源，并在城市和农村地区进行潜在监管，因为它们通常靠近住宅和商业建筑运行。
