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Organic Pollution and Salt Intrusion in Cai Nuoc District, Ca Mau Province, Vietnam
Author(s) -
Tho Nguyen,
Vromant Nico,
Hung Nguyen Thanh,
Hens Luc
Publication year - 2006
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143006x101755
Subject(s) - salinity , dry season , shrimp , wet season , pollution , environmental science , shrimp farming , population , surface water , aquatic ecosystem , aquaculture , hydrology (agriculture) , environmental chemistry , fishery , environmental engineering , biology , ecology , fish <actinopterygii> , chemistry , geology , demography , geotechnical engineering , sociology
In Ca Mau, Vietnam, farmers converted from rice to shrimp farming, while ignoring the degradation of the aquatic environment. We assessed the seasonal variations in organic pollution of the surface water and salt intrusion in one district and assessed the difference in chemical characteristics of the surface water of shrimp ponds and canals. Several variables reflecting salinity and organic pollution were measured in the wet and dry season. The results show that in the dry season salinity increased to 37.36–42.73 g l −1 and COD and suspended solids increased to a maximum of 268.7 mg l −1 and 1312.0 mg l −1 , respectively. In the wet season salinity values of 8.16 to 10.60 g l −1 were recorded, indicating that salinity could no longer be washed out completely in this season. It is concluded that salinity and suspended solids in the aquatic environment in the Cai Nuoc district are increased by shrimp monoculture, whereas organic pollution is contributed by human population pressure.