Wastewater treatment method and wastewater treatment apparatus

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 1/52 (2006.01) C02F 1/48 (2006.01)

Patent

CA 2726737

Provided are a wastewater treatment method and a wastewater treatment apparatus, which removes magnetic flocs formed by adding to wastewater an inorganic flocculant, magnetic particles, and a polymeric flocculant, by which energy required for decomposition of collected magnetic flocs can be reduced. The wastewater is treated as follows: the inorganic flocculant is added to the wastewater to form microflocs; magnetic microflocs created in advance are added to this wastewater; the microflocs and the magnetic microflocs are combined with each other with the polymeric flocculant to form huge flocs; and the huge flocs are separated by a magnetic separation apparatus 8 to be collected. Subsequently, as well as decomposing the collected huge flocs with a hydrothermal reaction, only magnetic particles are collected by another magnetic separation apparatus 26, and then the magnetic particles are recycled.

Provided are a wastewater treatment method and a wastewater treatment apparatus, which removes magnetic flocs formed by adding to wastewater an inorganic flocculant, magnetic particles, and a polymeric flocculant, by which energy required for decomposition of collected magnetic flocs can be reduced. The wastewater is treated as follows: the inorganic flocculant is added to the wastewater to form microflocs; magnetic microflocs created in advance are added to this wastewater; the microflocs and the magnetic microflocs are combined with each other with the polymeric flocculant to form huge flocs; and the huge flocs are separated by a magnetic separation apparatus 8 to be collected. Subsequently, as well as decomposing the collected huge flocs with a hydrothermal reaction, only magnetic particles are collected by another magnetic separation apparatus 26, and then the magnetic particles are recycled.

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