To solve the problems aeration for a long time and a large amount of calcium carbonate are required for oxidizing trivalent arsenic to pentavalent arsenic and a material capable of adsorbing or ion-exchanging trivalent arsenic and hexavalent chromium is not abundant and the amount of the material to be added is in an increasing tendency, in a hydroxide-iron coprecipitation method which is inexpensive and mostly used for disposing of trivalent arsenic typically contained in mining wastewater.
A material for disposing of heavy metal is made by using a product made by carbonizing paper sludge generated in recycling waste paper, in which a coating material of the waste paper contained in the sludge such as kaolin clay, calcium carbonate and talc are activated in a carbonizing process. Iron oxide, titanium oxide and a functional group of a non-carbonized compound that are trapped in a pore adsorb the heavy metal including trivalent arsenic. A material for disposing of heavy metal is made by further adding/mixing fine apatite to/with the above material for disposing of heavy metal, and because the apatite also has an adsorption effect for the trivalent arsenic, 99% of the trivalent arsenic can be added by an addition of 3% (by weight) by the stepwise addition of the material.
| JP2010069400 | METHOD FOR REMOVING BORON IN BORON-CONTAINING WASTEWATER |
| JPS58190487 | 【考案の名称】閃緑岩を使用した浄水器 |
| JP5164805 | Oil adsorbent |
SENZAKI TETSUO
KAWABE MASAO
NAKADE NOBUHITO
| JP2002522216A | 2002-07-23 | |||
| JP2002370084A | 2002-12-24 | |||
| JPH1161141A | 1999-03-05 | |||
| JP2003320370A | 2003-11-11 | |||
| JP2003126687A | 2003-05-07 | |||
| JP2002059001A | 2002-02-26 |
| WO2003022748A1 | 2003-03-20 |
Next Patent: EXHAUST GAS TREATMENT APPARATUS