| abstract |
(57) [Summary] In general wastewater, the wastewater is purified by hydroponic cultivation technology while utilizing the nutrients in the wastewater for cultivation of vegetables and vases, while containing trace amounts of environmental toxic substances. Provided is a wastewater treatment apparatus capable of collecting toxic substances by concentrating food in a food chain using plants and seafood in wastewater, and a method therefor. SOLUTION: A floating body 6 for floating, which enables floating hydroponic cultivation, is planted in the wastewater tank shown in FIG. 1 according to the purpose and time. During the growth process, plants absorb heavy metals in addition to nitrogen and phosphorus in water. In addition, the addition of a large number of fish and shellfish causes water agitation, not only a pest generation strategy but also the concentration of dilute environmental toxic substances in the body by the food chain, and then the fish and shellfish are collected and diffused into wastewater. Ecological concentration and recovery of toxic substances. A plurality of wastewater tank units in the state shown in FIG. 3 can be used in parallel or in series according to the amount of inflow water, wastewater concentration, and treatment capacity, or the same wastewater tank unit can be treated a plurality of times by providing a treated water return means. |