| 摘要 |
A wastewater treatment system is provided to minimize consumption of the treatment chemicals by using adequate quantities of treatment chemicals according to acidities of raw water and treated water, perform the wastewater treatment process promptly and accurately by completely automating the entire process, and substantially improve quality of the treated water by minimizing residual quantities of the treatment chemicals contained in final treated water. A wastewater treatment system comprises: first and second line mixers(11,12) sequentially installed between a water intake pump(20) and a flotation tank(18); a gas dissolver(19) installed between the second line mixer and the flotation tank; a first treatment chemical storage tank(14) that communicates with the first and second line mixers by feed pipes(14c,14d); a second treatment chemical storage tank(15) that communicates with the first and second line mixers by feed pipes(15c,15d); a plurality of fixed chemical quantity feeders(14a,14b,15a,15b) mounted on the respective feed pipes of the first and second treatment chemical storage tanks; a first acidity measuring unit(15-1) mounted on a flow path between the water intake pump and the first line mixer; a second acidity measuring unit(16) mounted on a flow path between the first and second line mixers; a third acidity measuring unit(17) mounted on a flow path between the second line mixer and the gas dissolver; and a control unit electrically connected to the fixed chemical quantity feeders and the first to third acidity measuring units respectively to control feed quantities of treatment chemicals fed into the first or second line mixer by operating one of the fixed chemical quantity feeders according to acidity measurement values received from the first to third acidity measuring units.
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