摘要
环保疏浚是控制湖泊内源污染的有效方法,但由于现有工艺疏浚过程中细颗粒物的再悬浮、疏浚后新生表层泥面较短时间内的生物活化和疏浚工程区外污染物迁入等因素,一些环保疏浚工程并未取得预期效果。通过对环保疏浚理论基础的分析,针对环保疏浚技术现存的问题,提出了一种改善疏浚效果的新疏挖工艺。其工艺流程为:①对整个疏浚区进行一次只吸不绞操作,疏浚掉表层易悬浮的絮状沉积物层;②在工程区内沉积物积聚区疏挖出几条与主风向垂直的深沟,用于捕获易悬浮的沉积物;③对整个工程区分区疏浚,采用挖掘能力稍小于输送能力施工;④疏挖深沟内积聚的易悬浮沉积物;⑤如有必要,一段时期后,再次疏挖深沟内积聚的易悬浮沉积物。
Environmental dredging seems to be an effective countermeasure for internal source control, but some environmental protection dredging projects can not obtain desired results owing to fine particle resuspension during dredging, biological activation of newborn surface sediment soon after dredging, and pollutant ongoing from out of project area, etc. Based on analyzing environmental dredging primary theory, this paper puts forward a new dredging technology to improve dredging effects aiming at existent problems of environmental dredging. Its technical processes are as follows： first, to remove the surface bottom layers rich in the flocculent, organic sediments through one operation of only suction not cutter in entire project area; second, dredge some deep channels plumbing prevailing wind direction to trap easy resuspended sediment; third, ensure that the excavation capacity is smaller than delivery capacity; fourth, dredge out easy resuspended sediment accumulated in deep channels; fifth, if necessary, dredge out easy resuspended sediment accumulated in deep channels again after a certain period.
出处
《中国农村水利水电》
北大核心
2010年第2期13-16,共4页
China Rural Water and Hydropower
基金
国家高技术研究发展计划项目(2009ZX07212-002
2006AA06Z343
2005AA6010100502)
长安大学校科技发展基金(07Z1503051001)
关键词
湖泊富营养化
沉积物
环保疏浚
lake eutrophication
sediment
environmental dredging
