Introduction

FBC

Fluidized bed crystallization (FBC) uses silica sand as carrier to recover metal salts or inorganic ions from wastewater in crystal forms. Properly controlled recycle flow provides mixing to maintain sand fluidization. Control of chemical reagent addition provides appropriate super- saturation for crystal formation. Crystals are discharged when the size is grown to 1 to 2 mm in diameter.

 Applications

●Fluoride-containing wastewater
●Arsenic-containing wastewater
●Water softening
●Phosphate / ammonium removal
●Heavy metal removal from wastewater

 Patents

●US 6235.203, 6210.589, 7045066
●NL 1004621, 1011698, 1014191
●CN ZL96213888.6, 03130727.2
●TW 088519, 122668, 143243, 161596, 189832

 Benefits

● Remove inorganic ions from wastewater
● Reduce sludge production by 75%
● Recover valuable resources in crystal form

 Introduction

The Fenton Family

Fenton process is an advanced oxidation process (AOP) of which Fenton’s reagent (H2O2 / Fe2+) is used to generate OH radical for chemical oxidations. ITRI’s Fenton family technologies include two major types of Fenton reactor, Fered-Fenton and FBR-Fenton. Fered-Fenton is applied to the pre-treatment of high strength wastewater, while FBR-Fenton is to treat residual refractory compounds for the polishing of wastewater.

 Applications

●Refractory organic wastewater treatment
●Colored wastewater treatment
●Surfactant wastewater treatment

 Patents

●US 6126838, 6143182
●NL 1009661
●DE 19835592
●TW 449574, 524779, 309506
●JP 9314153

 Benefits

● Low capital investment
● Small footprint
● Easy process control

Schematic diagram of FBR-Fenton reactor

Fered-Fenton reactor of a PCB plant