| abstract |
An inexpensive and simple water treatment method and apparatus that can be used for a wide range of drainage, generate less sludge, and consume less energy. SOLUTION: After adding basic substance 6 such as sodium hydroxide to waste water 1 and adjusting pH to 10 or more, divalent iron ion 5 is added to add inorganic substances such as organic substances and heavy metals, ions, floating substances, etc. A water treatment method in which contaminant particles are precipitated and removed, and amorphous small ferric hydroxide colloidal particles having a diameter of 30 nm or less are added to the supernatant to precipitate and remove remaining floating particles and anions. [Selection] Figure 1 |