Purification of Eucheuma gelatinae on nitrogen and phosphorus and effect on the level of chlorophyll a in eutrophic seawater

The ability of Eucheuma gelatinae purifies nitrogen and phosphorus and the control of microalgae biomass in eutrophic seawater was studied. The results showed that DIN and PO4-P can be eliminated efficiently by E.gelatinae in eutrophic seawater. The elimination effect of DIN and PO4-P was obvious after 72 h and 24 h respectively. Compare with the uptake of nitrate nitrogen and nitrite nitrogen, E.gelatinae preferentially absorbs ammonia nitrogen. The content of chlorophyll a in seawater can be control by E.gelatinae. The level of chlorophyll a achieved to the lowest value after 144 h and didn't rise back when the density of E.gelatinae was up 4 kg/m3. Therefore, E.gelatinae is one of the most ideal macroalgae in tropical sea to seawater purification and red tide control.