Organic carbon dynamics in a constructed mangrove wastewater wetland populated with benthic fauna: A modelling approach

摘要: Abstract The use of wetlands for processing nutrient- and organic-rich wastewater has proved effective to prevent coastal pollution in developing countries, mainly due low running costs (low energy consumption training requirements) relatively high system filtration efficiency (difference is flushed the minus what out, multiplied by 100). In this study we present a management model that simulate fate area specific organic carbon loadings constructed mangrove (CMW). was calibrated validated measured data obtained from newly established CMW Tanzania. Sewage nearby hotel pumped primary stabilization pond with residence time 12 h. Subsequently, sewage discharged into 9 unvegetated cells planted trees ( Avicennia marina ). Each group split 3 subgroups receiving seawater mixed 0, 20 60% six months. Raw assumed contain 0.5 (150 mg BOD L −1 ) person equivalent. provided good simulation oxygen, nutrient dynamics systems; production (by benthic microalgae phytoplankton); biomass change important faunal groups (crabs gastropods). High reduced decreased efficiency. Thus discharge 100 L 1 PE (300 mg BOD L ) m −2 requires water about 60 h within achieve Tanzanian emission standards (30 mg BOD L Higher fauna abundance biogenic structures (i.e. pneumatophores crab burrows) increased mineralization sediment up factor 2.