 Modular filtration system |
| In the present invention apparatus and methods are provided in which the head pressure developed by ... |
|
| Gas-gas-water treatment for groundwater and soil remediation |
| The present invention relates to injection of oxidizing gas in the form of microfine bubbles into ... |
|
| Multi-arrayed vacuum recovery method and system for groundwater wells |
| It is therefore an object of the present invention to provide a method and system for removing ... |
|
| Use of structure with membrane having continuous pores |
| What we claim is: 1. A substance enveloped in a film of a structure comprising at least one ... |
|
| Method of isolating biomolecules by ion exchange |
| Ion Exchange Using A Weak Ion Exchanger Referring to Figs. 1A-C sketches are shown of ion exchange ... |
|
| Iodinated matrices for disinfecting biological fluids |
| OF THE PREFERRED EMBODIMENTS The following description will enable a person skilled in the art to ... |
|
| Pelletized chromatography media of agarose, dextran or acrylamide/azlactone copolymer |
| Now, however, in accordance with the present invention, there is provided chromatography media in a ... |
|
| Blood cell washing systems and methods |
| Systems and methods in accordance with the invention pass shed blood in successive serial or ... |
|
| Blood processing method and apparatus with disposable cassette |
| An apparatus for regulating fluid flow in a blood processing system (such as a blood washing system)... |
|
| Rate-responsive pacemaker having selectable response to arm movement and pedal impacts |
| Accordingly, it is a general feature of the invention to provide a rate-responsive pacemaker ... |
|
|
Method for recovering etchant from etching waste liquid containing iron chloride
| Details |
Inventors: Inoshita, Tsutomu; Kitazawa, Tadao; Matsumoto, Hiroyuki; Nagashima, Masaki; Yoshino, Hiroshi; Nagaoka, Yonejiro; Mito, Katsumasa;
Assignee: Astec Irie Co., Ltd. (Fukuoka, JP)
Primary Examiner: Andrews; Melvyn
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman, Hattori, McLeland & Naughton
Method for recovering etchant from etching waste liquid 11 containing iron chloride is disclosed, wherein iron powder is mixed with iron chloride waste solution containing metal ions having a lesser ionization tendency than iron ion in an mixing vessel so as to cause a reaction between the iron powder and the metal ions and remove the precipitated metal from the iron chloride waste solution. The etching waste liquid 11 containing iron chloride or the iron chloride waste liquid which is an intermediate of the etching waste liquid 11 containing iron chloride is supplied to the mixing vessel from the bottom of the mixing vessel, an iron-powder processed liquid which comes up through a fluidized bed is continuously taken out from the mixing vessel and is returned to the bottom portion of mixing vessel so as to form the fluidized bed in the mixing vessel, and metal ions having the lesser ionization tendency than iron ion are removed from the etching waste liquid 11 containing iron chloride or the iron chloride waste liquid to produce the iron-powder processed liquid. |
|
DETAILED DESCRIPTION We claim: 1.
Method for recovering etchant from etching waste liquid containing iron chloride, the method comprising mixing iron powder with iron chloride waste solution containing metal ions having lesser ionization tendency than iron ion in a mixing vessel so as to cause a reaction between the iron powder and the metal ions and precipitate metals, removing precipitated metals from iron chloride waste solution to produce iron-powder processed liquid, and oxidizing the iron-powder processed liquid, wherein the iron chloride waste solution is supplied to the mixing vessel and a part of the iron-powder processed liquid is taken out from an upper portion of the mixing vessel and is returned to a bottom portion of the mixing vessel so as to form a fluidized bed in said mixing vessel which holds the iron powder in the fluidized bed in a dispersed and floating state, and an excess amount of the iron-powder processed liquid is taken out from the upper portion of the mixing vessel.
2.
Method for recovering etchant from etching waste liquid containing iron chloride according to claim 1, wherein the iron chloride waste solution is supplied to the mixing vessel from the bottom portion of the mixing vessel to facilitate the formation of the fluidized bed.
3.
Method for recovering etchant from etching waste liquid containing iron chloride according to claim 1, wherein an iron powder separating portion is formed at the upper portion of the mixing vessel which has a transverse cross sectional area greater than that of a fluidized bed forming portion at the bottom portion of the mixing vessel where the fluidized bed is formed, wherein the speed of the lifting flow in the mixing vessel is decelerated so that the lifting of the iron powder dispersed and floating bed is restricted.
4.
Method for recovering etchant from etching waste liquid containing iron chloride according to claim 1, further including subjecting an etching waste liquid containing iron chloride to an electrolyzing processing such that a part of or whole ferric ion in the etching waste liquid is reduced to the ferrous ion to produce a reduced iron chloride solution which is used as the iron chloride waste solution supplied to and processed in the mixing vessel
|
| Related patents |
|
|
Controlling corrosion in process water systems
The preparation of formaldehyde-free binder coated glass fiber products requires that the binder composition have a pH of less than about 3.5 to effectively coat the ...
|
|
|
Small diameter dual pump pollutant recovery system
OF THE INVENTION AND PREFERRED EMBODIMENTS In FIG. 1, a small diameter well pipe 62 of approximately 4 inches diameter and having a slotted screen sidewall is shown ...
|
|
|
Arrangement for cleaning contaminated ground water
Accordingly, it is an object of the present invention to provide an arrangement for cleaning contaminated ground water which has a simple construction and is simple to ...
|
|
|
Arrangement for cleaning contaminated ground water
Accordingly, it is an object of the present invention to provide an arrangement of the above mentioned general type, which is a further improvement of the known ...
|
|
|
Hydrocarbon removal system
(1) Progressive Contribution to the Art This invention comprises a process and apparatus for separating and removing undissolved and dissolved VOC contaminants from ...
|
|
|
Apparatus for recovery of liquid hydrocarbon
Accordingly, the invention provides a hydrocarbon pump unit for recovery of liquid hydrocarbon from a body of liquid with a hydrocarbon/water interface, comprising a ...
|
|
|
Method and apparatus for in situ groundwater remediation
OF THE INVENTION Turning now to the drawings, wherein like components are designated by like reference numerals throughout the various figures, FIGS. 1 and 2 show a ...
|
|
|
In-situ vapor stripping for removing volatile organic compounds from groundwater
The present invention is directed to a system for removing VOCs from groundwater. The system includes means for injecting gas into a well, to force groundwater flow ...
|
|
|
Pressure extraction process for removing soil and groundwater contaminants
The present invention is a more effective process for removal, including extraction and degradation, of underground contaminants from a soil area that includes a ...
|
|
|
Air sparging/soil vapor extraction apparatus
What is claimed is: 1. An apparatus for removing volatile contaminants from soil and groundwater, the apparatus mounted in a single bore hole in soil, the apparatus ...
|
|
|
Liquid Purification 
