Patent ID: 9598297
Date: 2017-03-21
CPC Classifications: A01N,B01D,C02F

Claim:
1. A method for treating organic-matter-containing water, comprising: a slime-controlling agent preparation step of preparing a slime-controlling agent comprising a combined chlorine agent produced from a chlorine-based oxidizer and a sulfamic acid compound such that an amount of the sulfamic acid compound per mol of an effective chlorine in the chlorine-based oxidizer is 0.5 to 5.0 mol; a slime-controlling-agent adding step of adding the slime-controlling agent to organic-matter-containing water in a concentration of the combined chlorine agent between 0.1-10 mg-Cl an activated-carbon-treating step of treating with activated carbon the organic-matter-containing water having undergone the slime-controlling-agent-adding step, the combined chlorine agent leaking in an activated carbon device to inhibit proliferation of viable cells in the activated carbon device; and a reverse-osmosis-membrane-separation step of passing the organic-matter-containing water having undergone the activated-carbon-treating step through a reverse osmosis membrane separation device comprising an aromatic polyamide membrane, the combined chlorine agent leaking in the activated carbon device further preventing biofouling and a decrease in flux due to an attachment of organic matter onto a membrane surface in a reverse osmosis membrane separation device.