South China Sea Ecological Center of Ministry of Natural Resources (MNR), Nansha Islands Coral Reef Ecosystem National Observation and Research Station, & Key Laboratory of Marine Environmental Survey Technology and Application (MNR), Guangzhou, 510300, China.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China.
Environ Res. 2024 Jun 15;251(Pt 2):118735. doi: 10.1016/j.envres.2024.118735. Epub 2024 Mar 20.
Inert construction and demolition waste from Hong Kong (HK public fills) has been used for marine trial reclamation in the Guanghai Bay (GHWT) of the Chinese Mainland. However, an environmental assessment of HK public fills is necessary due to higher radioactivity in HK soils than typical global levels. Here, radiation dose rate, gamma radionuclides and gross beta of HK public fills were analyzed. The origin information was explored using natural primordial radionuclides as fingerprints. Our data show that radiation dose rate of HK public fills before disposal was 0.14-0.54 (0.33 ± 0.03) μSv/h (n = 16,722 data with 2787 ships) in 2014, which is less than the GHWT background. Monthly detection of U, Ra, Pb, Th, Th, K, and gross beta in HK public fills was conducted on three random ships. Their specific activities were <6.27-155.5, 58.7-98.7, <7.83-238.2,97.9-168.6, 87.1-136.0, 463.1-1,018, and 1047-1658 Bq/kg, respectively. These results suggest that the radioactivity levels of HK public fills are essentially the same as the GHWT background. The study assessed potential risks using various indices icluding Ra (Radium equivalent activity), H (External radiation hazard index), H (Internal radiation hazard index), I (Gamma index), AUI (Activity utilization index), AUI (Activity utilization index), E (Annual effective dose), AGDE (Annual gonadal dose equivalent), RLI (Representative level index), D (Indoor air absorbed dose rate), D (Outdoor air absorbed dose rate), and ELCR (Excess lifetime cancer risk). The study suggests that HK public fills should be used for the trial reclamation rather than building-house materials. This provides valuable insights for the resource utilization and minimizing environmental pollution of HK public fills. The aim is to offer fundamental technical assistance for future waste resource utilization, ecological protection, and restoration in the Guangdong-Hong Kong-Macao Greater Bay Area.
来自香港（香港公填土）的惰性建筑和拆除废物已被用于中国大陆广海湾（GHWT）的海洋试验填海。然而，由于香港土壤中的放射性比全球典型水平高，因此有必要对香港公填土进行环境评估。在此，分析了香港公填土的辐射剂量率、伽马放射性核素和总β。利用天然原始放射性核素作为指纹探索了其来源信息。我们的数据表明，2014 年，在处置之前，香港公填土的辐射剂量率为 0.14-0.54（0.33±0.03）μSv/h（n=16722 个数据，2787 艘船），低于 GHWT 背景。每月对三艘随机船只上的香港公填土中的 U、Ra、Pb、Th、Th、K 和总β进行检测。它们的比活度分别为<6.27-155.5、58.7-98.7、<7.83-238.2、97.9-168.6、87.1-136.0、463.1-1018 和 1047-1658 Bq/kg。这些结果表明，香港公填土的放射性水平与 GHWT 背景基本相同。该研究使用各种指数（包括 Ra（镭当量活度）、H（外照射危害指数）、H（内照射危害指数）、I（伽马指数）、AUI（活动利用指数）、AUI（活动利用指数）、E（年有效剂量）、AGDE（年性腺剂量当量）、RLI（代表水平指数）、D（室内空气吸收剂量率）、D（室外空气吸收剂量率）和 ELCR（额外寿命癌症风险））评估了潜在风险。研究表明，香港公填土应用于试验填海，而不是建筑材料。这为香港公填土的资源利用和最小化环境污染提供了有价值的见解。目的是为未来粤港澳大湾区的废物资源利用、生态保护和恢复提供基础技术支持。
