Process for treating waste water

Claim 2

A process for treating waste water by wet oxidations which contains at least two components among suspended solids, ammonia and COD components, the process comprising the steps of; (i) subjecting waste water to liquid phase oxidation in the absence of a catalyst and in the presence of an oxygen-containing gas, (ii) subjecting the treated water from the step (i) to liquid phase oxidation in the presence of an oxygen-containing gas and a catalyst supported by a granular carrier and comprising at least one of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten and compounds thereof insoluble or sparingly soluble in water, (iii) subjecting the treated water from the step (ii) to anaerobic digestion by anaerobic methane fermentation, and (iv) returning the excess sludge from the step (iii) to the step (i).

Claim 3

A process as defined in claim 1 wherein the waste water is subjected to the step (i) at a pH of about 5 to about 10.

Claim 4

A process as defined in claim 2 wherein the waste water is subjected to the step (i) at a pH of about 6 to about 9.

Claim 5

A process as defined in claim 1 wherein the temperature in the step (i) is about 100° to about 370° C.

Claim 6

A process as defined in claim 4 wherein the temperature is about 200° to about 300° C.

Claim 7

A process as defined in claim 1 wherein the active component of the catalyst used in the step (ii) is at least one of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten.

Claim 8

A process as defined in claim 1 wherein the active component of the catalyst used in the step (ii) is at least one of compounds insoluble or sparingly soluble in water of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten.

Claim 9

A process as defined in claim 7 wherein the active component of the catalyst is at least one of oxides, chlorides and sulfides.

Claim 10

A process as defined in claim 1 wherein the temperature in the step (ii) is about 100° to about 370° C.

Claim 11

A process as defined in claim 9 wherein the temperature is about 200° to about 300° C.

Claim 12

A process as defined in claim 1 wherein the step (iii) is carried out at a temperature of about 35° to about 60° C., a digesting time of about 1 to 30 days and a sludge concentration of about 2 to about 5%.

Claim 13

A process for treating waste water by wet oxidations which contains at least two components among suspended solids, ammonia and COD components, the process comprising the steps of; (i) subjecting waste water to liquid phase oxidation in the absence of a catalyst and in the presence of an oxygen-containing gas, (ii) subjecting the treated water from the step (i) to liquid phase oxidation in the presence of an oxygen-containing gas and a catalyst supported by a granular carrier and comprising at least one of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten and compounds thereof insoluble or sparingly soluble in water, (iii) subjecting the treated water from the step (ii) to aerobic treatment by an activated sludge method, and (iv) returning the excess sludge from the step (iii) to the step (i).

Claim 14

A process for treating waste water by wet oxidations which contains at least two components among suspended solids, ammonia and COD components, the process comprising the steps of; (i) subjecting waste water to liquid phase oxidation in the absence of a catalyst and in the presence of an oxygen-containing gas, (ii) subjecting the treated water from the step (i) to liquid phase oxidation in the presence of an oxygen-containing gas and a catalyst supported by a granular carrier and comprising at least one of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten and compounds thereof insoluble or sparingly soluble in water, (iii) subjecting the treated water from the step (ii) to aerobic treatment by an activated sludge method, and (iv) returning the excess sludge from the step (iii) to the step (i).

Claim 15

A process as defined in claim 12 wherein the waste water is subjected to the step (i) at a pH of about 5 to about 10.

Claim 16

A process as defined in claim 13 wherein the waste water is subjected to the step (i) at a pH of about 6 to about 9.

Claim 17

A process as defined in claim 12 wherein the temperature in the step (i) is about 100° to about 370° C.

Claim 18

A process as defined in claim 15 wherein the temperature is about 200° to about 300° C.

Claim 19

A process as defined in claim 12 wherein the active component of the catalyst used in the step (ii) is at least one of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten.

Claim 20

A process as defined in claim 12 wherein the active component of the catalyst used in the step (ii) is at least one of compounds insoluble or sparingly soluble in water of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten.

Claim 21

A process as defined in claim 18 wherein the active component of the catalyst is at least one of oxides, chlorides and sulfides.

Claim 22

A process as defined in claim 12 wherein the temperature in the step (ii) is about 100° to about 370° C.

Claim 23

A process as defined in claim 20 wherein the temperature is about 200° to about 300° C.

Claim 24

A process as defined in claim 12 wherein the step (iii) is carried out at a temperature of about 20° to about 40° C. and a residence time of about 3 to 24 hours.

Claim 25

A process for treating waste water by wet oxidations which contains at least two components among suspended solids, ammonia and COD components, the process comprising the steps of; (i) subjecting waste water to liquid phase oxidation in the absence of a catalyst and in the presence of an oxygen-containing gas, (ii) subjecting the treated water from the step (i) to liquid phase oxidation in the presence of an oxygen-containing gas and a catalyst supported by a granular carrier and comprising at least one of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten and compounds thereof insoluble or sparingly soluble in water, (iii) subjecting the treated water from the step (ii) to anaerobic digestion by anaerobic methane fermentation, and (iv) subjecting the treated water from the step (iii) to aerobic treatment by an activated sludge method, and (v) returning the excess sludge from the steps (iii) and (iv) to the step (i).

Claim 26

A process for treating waste water by wet oxidations which contains at least two components among suspended solids, ammonia and COD components, the process comprising the steps of; (i) subjecting waste water to liquid phase oxidation in the absence of a catalyst and in the presence of an oxygen-containing gas, (ii) subjecting the treated water from the step (i) to liquid phase oxidation in the presence of an oxygen-containing gas and a catalyst supported by a granular carrier and comprising at least one of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten and compounds thereof insoluble or sparingly soluble in water, (iii) subjecting the treated water from the step (ii) to anaerobic digestion by anaerobic methane fermentation, and (iv) subjecting the treated water from the step (iii) to aerobic treatment by an activated sludge method, and (v) returning the excess sludge from the steps (iii) and (iv) to the step (i).

Claim 27

A process as defined in claim 23 wherein the waste water is subjected to the step (i) at a pH of about 5 to about 10.

Claim 28

A process as defined in claim 24 wherein the waste water is subjected to the step (i) at a pH of about 6 to about 9.

Claim 29

A process as defined in claim 23 wherein the temperature in the step (i) is about 100° to about 370° C.

Claim 30

A process as defined in claim 26 wherein the temperature is about 200° to about 300° C.

Claim 31

A process as defined in claim 23 wherein the active component of the catalyst used in the step (ii) is at least one of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten.

Claim 32

A process as defined in claim 23 wherein the active component of the catalyst used in the step (ii) is at least one of compounds insoluble or sparingly soluble in water of iron, cobalt, manganese, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold and tungsten.

Claim 33

A process as defined in claim 29 wherein the active component of the catalyst is at least one of oxides, chlorides and sulfides.

Claim 34

A process as defined in claim 23 wherein the temperature in the step (ii) is about 100° to 370° C.

Claim 35

A process as defined in claim 31 wherein the temperature is about 200° to about 300° C.

Claim 36

A process as defined in claim 23 wherein the step (iii) is carried out at a temperature of about 35 to about 60° C., a digesting time of about 1 to 30 days and a sludge concentration of about 2 to about 5%.

Claim 37

A process as defined in claim 23 wherein the step (iv) is carried out at a temperature of about 20° to about 40° C. and a residence time of about 3 to about 24 hours.