248 PATENT ABSTRACTS

the chlorine dioxide in the treatment solution which attacks and destroys the infectious con- stituents of the waste, thereby decontaminating the waste. Upon dewatering, the decon- taminated waste is suitable for landfilling. Process control is exercised by controlling the temperature of the aqueous solvent. A solvent temperature is selected which optimizes both the chlorine dioxide concentration in the treatment solution and the reactivity of the chlorine diox- ide with the infectious constituents. Continuous monitoring of the chlorine dioxide concentra- tion in the treatment solution enables adjust- ment of the solvent preheat temperature to optimal values in accordance with the dynamics of the treatment system.

5192428

P O R T A B L E S Y S T E M F O R T R E A T I N G H U M A N W A S T E

Carl Lindstrom assigned to Clivus Multrum Inc

A new portable system is disclosed for com- posting feces and for treating urine includes a composting retainer which includes a com- posting means for exposing the feces to sufficient air and water to allow the feces to compost, thereby forming a compost product. A urine- treatment retainer with aerobic nitrifying bac- teria disposed on a substrate whereby urine is treated by the bacteria, thereby forming a liquid product. A means is available for transporting the portable system.

5192441

P R O C E S S A N D I N S T A L L A T I O N F O R B I O L O G I C A L T R E A T M E N T , E.G. BY N I T R I F I C A T I O N A N D / O R

D E N I T R I F I C A T I O N , O F A N E F F L U E N T I N C L U D I N G N I T R A T E D P O L L U T I O N

Jacques Sibony, Gilbert Desbos, Paris, France assigned to Omnium de Traitements et de Valorisation (OTV)

A process for the biological treatment by nitrification and/or denitrification of an effluent containing nitrogen pollution includes the fol- lowing steps: an incident flow of this water is brought into a mixing zone with at least one compartment in which, by turbulent mechanical agitation, an inconsumable and insoluble granular material, loaded with biomass, is put in

homogeneous suspension in this water, and is maintained at a more or less constant mass con- centration; this water and this granular material in suspension are circulated in a separation zone from which is extracted on the one hand clarified water, and on the other hand biomass loaded granular material; and almost all of the active biomass fixed on said granular material is brought back by forced recycling to the mixing zone.

5192456

A P P A R A T U S F O R T R E A T I N G A C T I V A T E D S L U D G E A N D

M E T H O D O F C L E A N I N G I T

Hiroshi Ishida, Yutaka Yamada, Kiyoshi Izumi, Masashi Moro, Paris, assigned to Kubota Cor- poration

An activated sludge treating apparatus for use in treating wastewater, such as gray water and sewage. A plurality of filter membrane modules are vertically arranged in parallel at pre- determined intervals within a treating tank. The water to be treated which is stored in the treating tank is separated into solid and liquid by the fil- ter membrane modules, and water that has pas- sed through the filter membrane modules is extracted as treated water. An agitating device is disposed at a level below the filter membrane modules.

5194147

D E C O N T A M I N A T I O N S Y S T E M

Margre Augustine, Carl N Hodges, Linda S Leigh assigned to Space Biospheres Ventures

Solutions containing pesticide wastes from greenhouses, for example, are decontaminated in a system including a soil bed reactor. Waste water from the greenhouse goes to a sample tank from which samples are withdrawn for assay of toxicity. Water from the sample tank goes to a holding tank, or to a downstream subsystemif toxicity level is low. Water in the holding tank is aerated to promote degradation of toxic materials. Water from the holding tank is applied near the upper surface of a layer of soil in the soil bed reactor. Air from the sample tank and holding tank, and intermittently, air con- raining pesticides from the greenhouse, is also passed through the layer of soil in the soil bed reactor. Microbial action in the soil degrades