Air and water pollution control

Claim 2

In a process for pollution control wherein waste gases containing solid and gaseous contaminants are purified by direct contact with water to provide a purified gaseous stream for evacuation to the atmosphere and a water effluent containing dissolved or absorbed gaseous contaminants and suspended and dissolved solid contaminants, the improvement comprising preventing water pollution and conserving water by: separating the suspended contaminants from said water effluent subjecting the resulting water to a desorption step to remove gaseous contaminants after first preheating same, collecting the removed gaseous contaminants, distilling the resulting water to provide a pure water condensate and a blow-down water concentrated in solids content, removing solids from the blow-down water to provide water suitable for industrial use, and returning at least part of said water suitable for industrial use to contact further waste gases.

Claim 3

In a process for pollution control wherein waste gases containing solid and gaseous contaminants including gaseous sulfur compounds are purified by direct contact with water to provide a purified gaseous stream for evacuation to the atmosphere and a water effluent containing dissolved or absorbed gaseous contaminants and suspended and dissolved solid contaminants, the improvement comprising preventing water pollution by: separating the suspended contaminants from said water effluent, subjecting the resulting water to a desorption step to remove gaseous contaminants including said gaseous sulfur compounds after first preheating same, collecting said gaseous contaminants including said gaseous sulfur components, distilling the resulting water to provide a pure water condensate and blow-down water concentrated in solids content, and removing solids from the blow-down water to provide water suitable for industrial use.

Claim 4

In a process for pollution control wherein waste gases containing solid and gaseous contaminants including gaseous sulfur compounds are purified by direct contact with water to provide a purified gaseous stream for evacuation to the atmosphere and a water effluent containing dissolved or absorbed gaseous contaminants and suspended and dissolved solid contaminants, the improvement comprising preventing water pollution by: separating the suspended contaminants from said water effluent, subjecting the resulting water to a desorption step to remove gaseous contaminants including said gaseous sulfur compounds after first preheating same, collecting said gaseous contaminants including said gaseous sulfur components, distilling the resulting water to provide a pure water condensate and blow-down water concentrated in solids content, and removing solids from the blow-down water to provide water suitable for industrial use.

Claim 5

IN A PROCESS POLLUTION CONTROL WHEREIN WASTE GASES ARE PURIFIED BY CONTACT WITH WATER TO PROVIDE A PURIFIED GASEOUS STREAM FOR EVACUATION TI THE ATMOSPHERE AND A WATER EFFLUENT CONTAINING DISSOLVING SOLIDS AND DISSOLVED AND ABSORBED GASEOUS CONTAMINANTS, THE IMPROVEMENT COMPRISING PREVENTING WATER AND AIR POLLUTION AND RECOVERING USABLE WATER BY SUBJECTION ALL OF SAID WATER EFFLUENT TO DISTILLATION IN EVAPORATION APPARATUS HAVING A PREHEAT ZONE AND A DISTILLATION ZONE TO PROVIDE A USABLE PURE WATER CONDENSATE AND A DISTALLATION ZONE TO TRATE, REMOVING GASEOUS COMTAMINANTS FROM SAID WATER EFFLUENT INA DEGASSING STEP FOLLOWING SAID PREHEAT ZONE AND PRIOR TO THE

Claim 6

IN A PROCESS POLLUTION CONTROL WHEREIN WASTE GASES ARE PURIFIED BY CONTACT WITH WATER TO PROVIDE A PURIFIED GASEOUS STREAM FOR EVACUATION TI THE ATMOSPHERE AND A WATER EFFLUENT CONTAINING DISSOLVING SOLIDS AND DISSOLVED AND ABSORBED GASEOUS CONTAMINANTS, THE IMPROVEMENT COMPRISING PREVENTING WATER AND AIR POLLUTION AND RECOVERING USABLE WATER BY SUBJECTION ALL OF SAID WATER EFFLUENT TO DISTILLATION IN EVAPORATION APPARATUS HAVING A PREHEAT ZONE AND A DISTILLATION ZONE TO PROVIDE A USABLE PURE WATER CONDENSATE AND A DISTALLATION ZONE TO TRATE, REMOVING GASEOUS COMTAMINANTS FROM SAID WATER EFFLUENT INA DEGASSING STEP FOLLOWING SAID PREHEAT ZONE AND PRIOR TO THE

Claim 7

The process of claim 3 wherein said water effluent is subjected to distillation in multi-stage evaporator apparatus, each stage having a preheat zone and a distillation zone, the water effluent is passed sequentially through the preheat zones prior to entering the distillation zones and its temperature increased in each preheat zone, the heated water is subjected to a degassing step following each preheat zone, and the desorbed gases are separately collected and recovered.

Claim 8

In a process for pollution control wherein waste gases containing solid and gaseous contaminants are purified by direct contact with water to provide gaseous stream for evacuation to the atmosphere and a water effluent containing dissolved or absorbed gaseous contaminants and suspended and dissolved contaminants, the improvement comprising preventing water pollution and recovering usable water by: separating the suspended contaminants from said water effluent, subjecting the resulting water to a desorption step to remove gaseous contaminants after first preheating same, recovering said removed gaseous contaminants to prevent atmospheric pollution, distilling the resulting water to provide a pure water condensate and a blow-down water Concentrated in solids content, and removing solids from the blow-down water to provide water suitable for industrial use.

Claim 9

In a process for pollution control wherein waste gases containing solid and gaseous contaminants are purified by direct contact with water to provide gaseous stream for evacuation to the atmosphere and a water effluent containing dissolved or absorbed gaseous contaminants and suspended and dissolved contaminants, the improvement comprising preventing water pollution and recovering usable water by: separating the suspended contaminants from said water effluent, subjecting the resulting water to a desorption step to remove gaseous contaminants after first preheating same, recovering said removed gaseous contaminants to prevent atmospheric pollution, distilling the resulting water to provide a pure water condensate and a blow-down water Concentrated in solids content, and removing solids from the blow-down water to provide water suitable for industrial use.

Claim 10

The process of claim 5 wherein the suspended contaminants are separated by centrifugation.

Claim 11

In a process for pollution control wherein hot waste gases containing solid and gaseous contaminants are passed through a waste heat boiler and are then purified by direct contact with water to provide a purified gaseous stream for evacuation to the atmosphere and a water effluent containing dissolved or absorbed gaseous contaminants and suspended and dissolved contaminants, the improvement comprising preventing water pollution by: separating the suspended contaminants from said water effluent, subjecting the resulting water to a desorption step to remove gaseous contaminants after first preheating same, collecting the removed gaseous contaminants, distilling the resulting water to provide a pure water condensate and a blow-down water concentrated in solids content, removing solids from the blow-down water to provide water suitable for industrial use, and utilizing heat recovered in said waste heat boiler to provide heat for said distillation.

Claim 12

In a process for pollution control wherein hot waste gases containing solid and gaseous contaminants are passed through a waste heat boiler and are then purified by direct contact with water to provide a purified gaseous stream for evacuation to the atmosphere and a water effluent containing dissolved or absorbed gaseous contaminants and suspended and dissolved contaminants, the improvement comprising preventing water pollution by: separating the suspended contaminants from said water effluent, subjecting the resulting water to a desorption step to remove gaseous contaminants after first preheating same, collecting the removed gaseous contaminants, distilling the resulting water to provide a pure water condensate and a blow-down water concentrated in solids content, removing solids from the blow-down water to provide water suitable for industrial use, and utilizing heat recovered in said waste heat boiler to provide heat for said distillation.

Claim 13

The process of claim 7 wherein the gases are waste stack gases at a temperature above 500*F and are cooled in the waste heat boiler to a temperature below about 200*F prior to contact with the purifying water.

Claim 14

In process for pollution control wherein waste gases containing solid and gaseous contaminants are purified by direct contact with water to provide a purified gaseous stream for evacuation to the atmosphere and a water effluent containing dissolved or absorbed gaseous contaminants and suspended and dissolved solid contaminants, the improvement comprising preventing water pollution by: separating the suspended contaminants from said water effluent, passing the resuling water through a preheat zone of a water distillation unit, removing gaseous components from the preheated water, collecting said removed gaseous components to prevent atmospheric pollution, passing the resulting water into the water distillation zone of said distillation unit and distilling it to provide a pure water condensate and a blow-down water concentrated in solids content, and removing solids from the blow-down water to provide water suitable for industrial use.

Claim 15

In process for pollution control wherein waste gases containing solid and gaseous contaminants are purified by direct contact with water to provide a purified gaseous stream for evacuation to the atmosphere and a water effluent containing dissolved or absorbed gaseous contaminants and suspended and dissolved solid contaminants, the improvement comprising preventing water pollution by: separating the suspended contaminants from said water effluent, passing the resuling water through a preheat zone of a water distillation unit, removing gaseous components from the preheated water, collecting said removed gaseous components to prevent atmospheric pollution, passing the resulting water into the water distillation zone of said distillation unit and distilling it to provide a pure water condensate and a blow-down water concentrated in solids content, and removing solids from the blow-down water to provide water suitable for industrial use.

Claim 16

The process of claim 9 wherein a multi-stage water distillation is employed, the water containing dissolved or absorbed gases is passed sequentially through a said preheat zone in each distillation stage prior to entering into the distillation zones and its temperature is increased in each preheat zone, and dissolved gaseous components are removed after passage through each preheat zone.