Abstract: An aquatics combination system composed of Bischofia javanica, Hygrophila salicifolia, Vallisneria natans, Macropodus opercularis, Cipangopaludina Cahayensi and biomass char was applied to the treatment of eutrophic garden scenic waters. The growth status of aquatics in this system and the aquatics’ effect of eliminating larvae and wiggler as well as the purification effect for TN, TP, COD, NH⁺₄-N, and NO^-₂-N in the water body were examined. Results showed that no larvae or wiggler was found in the aquatics combination system which enjoyed a good growth status and a satisfactory effect of removing pollutants. The removal rate of TN, TP, COD, NH⁺₄-N, and NO^-₂-N reached 64.4%, 49.5%, 65.7%, 73.8% and 82.6%, respectively. The content of TN, COD and DO met the standard of surface water quality IV-level specified in national standard GB 3838—2002, and NH⁺₄-N measured up to level Ⅱ. In conclusion, each component in the aquatics combination system performs its duty, and the technology is pollution-free, hence is conducive to the sustainable water ecological restoration.

Key words: aquatics, biomass char, aquatics combination system, eutrophic scenic waters, purification effect