P. Sansanayuth et al., SHRIMP POND EFFLUENT - POLLUTION PROBLEMS AND TREATMENT BY CONSTRUCTED WETLANDS, Water science and technology, 34(11), 1996, pp. 93-98
Citations number
8
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
An intensive shrimp culture in Thailand has rapidly expanded especiall
y along the coast during the last decade. Excessive feed basically giv
en during the culture causes water and sediment in the pond to contain
organic matter and nutrients in high concentration. After harvesting,
discharging sediment is prohibited; however, pond water is mostly dis
charged directly to natural water resources without any effective trea
tment. The nutrient load discharged from shrimp ponds can form signifi
cant source of nutrients causing pollution and eutrophication in litto
ral areas of Thailand. The possibility of a subsurface-flow constructe
d wetlands application for treating shrimp pond effluent containing hi
gh salinity was studied. An experimental-scaled model planted with Acr
ostchum aureum (mangrove fern) in gravel was studied by comparison wit
h one containing only gravel. The results showed that models can reduc
e suspended solids, biochemica oxygen demands, total organic carbon, t
otel nitrogen (T-N) and total phosphorous (T-P) up to 84%, 91%, 46%, 4
8% and 31%, respectively. Higher removal efficiencies for TOC, T-N and
T-P of the planted model compared with the gravel model were clearly
found. Copyright (C) 1996 IAWQ. Published by Elsevier Science Ltd.