厦门港疏浚物海洋倾废评价的试验研究 Ⅰ.主要有害物质在围隔海水中的释放

MESOCOSM ASSESSMENT OF DUMPING DREDGED MATERIALS FROM XIAMEN HARBOUR AT SEAI . RELEASE OF PRINCIPAL HARMFUL SUBSTANCES FROM DREDGED MATERIALS WITHIN MESOCOSM

应用围隔海水实验技术研究厦门港疏浚物倾倒入海后其中主要有害物质的释放及其对海洋初级生产力的影响。本文仅讨论了倾倒——沉降及倾倒——混合两种情况下几种主要有害物质从实验疏浚物释放到水体的结果,提出了评估释放程度的方法。释放系数计算结果表明:沉降条件下油类、666、DDT、Hg和Pb没有净释出,某些有害物质如DDT、Hg、Pb还可能由于疏浚物的加入,从水体中清除掉。Cd的释放程度较高,值得注意。搅拌混合条件下,油类、Hg、Pb、Cd、Cu的释放程度略有增加。

Mesocosm technique was used to study the release of principal harmful substances from the dredged materials from Xiamen Harbour dumped at sea and its effect on marine primary productivity.This paper presents a discussion on the results of mesocosm experiment of the release of the substances from the materials into sea water column under two conditions;dumping-settling and dumping-mixing,with a method for assessment of release ratio introduced.Calculation of the release factors indicated there was no net release of oil,BHC,DDT,Hg and Pb,and there appeared somewhat removal of DDT,Hg and Pb from water column due to the addition of the dredged materials under the settling condition.It should be noted that Cd had higher release ratio than the others.The release ratios of oil,Hg,Pb,Cd and Cu increased a little under mixing condition.