Abstract
Combined purification system of microorganism - aquatic plants were established by adding immobilized 3.0 × 1010 CFU/m3 EM (Effective Microorganisms) to Eichhornia crassipes and Pistia stratiotes, to study the purification effect on prawn aquaculture water. The results showed that the purification effect of 2 groups of immobilized microorganism - aquatic plants (SEE and SEP) on ammonia nitrogen (NH4+-N), total nitrogen (TN), total phosphorus (TP) and chemical oxygen consumption (COD) were significantly better than those of the immobilized microorganism SEM group (P<0. 05). The degradation efficiency of SEE and SEP system to ammonia nitrogen were 98.37% and 96.22%. The degradation rate of TP were 90.28% and 86.11% respectively. The removal efficiency of COD were both close to 86%. At the same time, Eichhornia crassipes was slightly better than Pistia stratiotes in microorganism - aquatic plants system.
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