IV New Patents

and highly alkaline waste materials are first neutralized in a holding vessel before being pas- sed into the ion exchanger.

5002~1

lower phosphorus phase from an upper dirt phase. The mixtures are treated prior to addition of the quaternary ammonium compound, where required, by lowering their dirt to phosphorus levels sufficiently low to permit them to be destabilized.

METHOD FOR SOX/NOX POLLUTION CONTROL 5 ~ 3 1 ~

Richard G Hooper assigned to Natec Resources Inc

MICROWAVE SLUDGE DRYING APPARATUS AND METHOD

SOx/NOx pollution control process comprising injecting into flue gas from 1 to 50~o carbon (pre- ferably 5-15~o) along with a dry, finely divided sodium sorbent, preferably sodium bicarbonate or Nahcolite, a naturally occurring form of sodium bicarbonate. The process removes both SOx and NOx from the flue gases of utility and industrial plants, incinerators and the like by dry injection into a flue gas duct a sufficient distance upstream of a particulate collection device, such as an ESP or baghouse, to collect spent reagent and additive. The sodium reagent reacts with the SO2 to form sodium sulfate and also removes NOx in the form to NO. The carbon additive reacts with NO2 to reduce the concentration of the NO2 in the exit flue gases to below the NO2 brown plume visibility threshold (about 30 ppm NO2, not corrected to 0~ 02, depending on stack diameter and ambient conditions). The ad- ditive may be used alone or in conjunction with other adjuvants or additive such as urea or ammonia. The carbon must have a high effective surface area to be active is suppressing NO to NO2 conversion, and is preferably present in, on, in association with, or mixed with, an inert carrier, such as fly ash. Preferably, the C factor, which is the product of the fraction of carbon in the additive times the effective surface area of the carbon in the additive, is above 1.

5 ~ 2 ~ 5

METHOD OF SEPARATING AND RECOVERING PHOSPHORUS

FROM PHOSPHORUS SLUDGE

Alan S Michaels, Wayne Lee, Theodore Mun- day assigned to FMC Corporation

A process is described for the separation and recovery of phosphorus from phosphorus-dirt mixtures by adding a quaternary ammonium compound to the mixture, while it is under an aqueous cover, agitating same, and separating a

Daniel Marks, Donald G Fluchel assigned to Progressive Recovery Inc

An apparatus for separating hazardous volatile and semi-volatile organic materials from con- taminated solid waste by-products is comprised of an evaporation/vacuum heating chamber that is designed to hold a sample of the solid waste product on a batch basis, a microwave generator that subjects the sample of waste product to microwave energy, an electrical resistance type heating system that heats portions of the waste product sample adjacent the container holding the sample that are not subjected to the full strength of the microwaves, and an evacuation/condensing system that draws off volatile vapors distilled from the waste sample and condenses and collects the hazardous volatile organic materials, leaving a resultant waste product cake, dry and virtually free of volatile matter in the evaporation/vacuum heating chamber.

5003176

IONIZATION CHAMBER

Eiichi Tanaka, Tatsuro Hayashi, Shizuoka, Japan assigned to Hamamatsu Photonics K K

An ionization chamber can stably measure a weak ionizing radiation with high sensitivity. The ionization chamber comprises an electrically conductive charge collecting electrode having a magnetic substance or a permanent magnet; an electromagnet for positioning the charge collec- ting electrode in non-contact with the other part of the ionization chamber; a position sensor for detecting the position of the charge collecting electrode; a circuit for feedback-controlling the magnetic force of the electromagnet to maintain the charge collecting electrode at the substan- tially same position; and ionization current detecting circuit for detecting an ionization cur-