The present invention is to remove the organic matter in the form of suspended solids in the physical filtration process in combination with a physical filtration process by a filtrate filter medium filter tank and a biological treatment method by microfiber contact medium to purify the water quality of the closed water space, The furnace relates to a circulating lake water purification system that effectively reduces and removes soluble organic matters with little treatment effect and nitrogen, phosphorus and the like.;The present invention is installed at the rear end of the filtrate filter medium filter tank for accommodating raw water introduced from the treated water system to remove the suspended solids in the water, and the fibrous filter medium filter type is fixed to the bottom of the water or the water, the microbial growth It is composed of micro-microbial contact media for effectively reducing and removing dissolved organic matter and nitrogen, phosphorus and the like. According to this configuration, the present invention physically filters certain portions of raw water by fiber media in the ponds of appealing parks and neighboring residential complexes, and removes inorganic suspended solids. Soluble organic matter, nitrogen and phosphorus, which are difficult to reduce and remove by physical filtration processes, are rapidly decomposed and decomposed and removed by multi- and high-density aquatic microorganisms that grow in the microbial habitat of micro-microbial contact media. It is effective in achieving water purification by maximizing self-cleaning ability.;The present invention configured as described above has the effect of maintaining the prescribed water quality by using a combination of physical and biological treatment methods, preventing the occurrence of odor, supplying fish habitat and circulating type, so that supply of water is unnecessary.
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