Weng Jia-Xing
Institute of Geotechnical Engineering, Southeast University, Nanjing, 210096, People's Republic of China.
Environ Monit Assess. 2017 Jun;189(6):246. doi: 10.1007/s10661-017-5963-x. Epub 2017 May 2.
Deteriorating of urban river environment in Yangzhou is gradually serious in recent years. Treatment measures including pollution source control, sewage interception, and sludge dredging have been carried out in recent years, but urban river environment is still poor. In order to ascertain the causes, post-dredging effects were assessed based on sediment chemical quality in urban rivers of Yangzhou. Results indicate that post-dredging effects are not ideal because of backward dredging technique and incomplete pollution control. Eutrophication degree is still relatively high for most of them and pollution degree of nutrients is total phosphorus (TP) > total nitrogen (TN) > organic matter (OM). Although the pollution of heavy metals is not serious, the major pollution factors Cd and Hg should still be monitored intensively in the sludge dredging for the toxic effect of heavy metals.
近年来，扬州城市河流环境恶化问题日益严重。尽管近年来已采取了包括污染源控制、污水截流和清淤等治理措施，但城市河流环境仍较差。为查明原因，基于扬州城市河流沉积物化学质量对清淤效果进行了评估。结果表明，由于清淤技术落后和污染控制不彻底，清淤效果不理想。大多数河流的富营养化程度仍然较高，营养物质的污染程度为总磷（TP）>总氮（TN）>有机质（OM）。虽然重金属污染不严重，但鉴于重金属的毒性作用，在清淤过程中仍应重点监测主要污染因子镉和汞。
