Patent ID: 8142650

Claim:
A water treatment system comprising: an oil removal apparatus including a fixed-bed reactor configured to hold adsorption particles by use of a magnetic unit, the adsorption particles each including a base material containing magnetite, the adsorption particles configured to adsorb oil included in to-be-treated water; a pretreatment apparatus configured to recover the oil from the adsorption particles sent from the oil removal apparatus; and a thermal energy generating apparatus configured to obtain thermal energy from the oil recovered by the pretreatment apparatus, wherein the fixed-bed reactor includes: a main body having a concave part; a holding net having an annular shape including a closed top, an open bottom, and a permeable outer sidewall; an electromagnet as the magnet unit which is received in the concave part of the main body; a water outlet for purified water proximate the top of the main body; a lower end portion of the main body defining an open chamber adjacently below the open bottom of the holding net; a water inlet in the lower end portion of the main body opening into the open chamber for supplying the to-be-treated water to the fixed-bed reactor; a supply port in the lower end of the main body portion opening into the open chamber for supplying regenerated adsorption particles to the fixed-bed reactor; and an effluent port in the lower end of the main body opening into the open chamber for removing used adsorption particles from the fixed-bed reactor.