Abstract: The effects of the artificial alga concrete reefs made of different proportional scrap iron and iron powder（a machine trash） on the attachment and growth of fouling organisms were studied,and the feasibility of trash iron on construction of artificial reefs was discussed.The results showed that the artificial alga concrete reefs had significant influence on attachment of the organisms on reefs surface.The three surveys revealed that the average amount of organisms attaching on iron-powder reefs was 0.236 kg/m2,and on the iron-scrape reefs and reefs without iron were 0.21 kg/m2,0.082 kg/m2,respectively.There were more organisms attaching on the iron models than that on the non-iron models entirely.The average amounts of fouling organisms were found to be 0.168,0.269,0.198,0.169,0.345,and 0.147 kg/m2 on reefs containing 0.05%,0.10%,0.50%,1.00%,1.96%,and 2.91% of iron 3.5 months later.The optimal attachment（0.459 kg/m2,and intensity of 12.5 MPa） was observed on the iron-scrap alga reef model with iron-proportion of 1.96%.The worst attachment was found in the reef models without iron.
2010, Vol. 25 
