PERFORMANCE DATA


The ODORGARD™ process gives high performance because far more efficient scrubbing of odorous compounds is achieved (e.g. H2S destruction demonstrated to be in excess of 99.9%).

By utilizing the catalyst and its highly reactive surface oxygen, a much wider range of compounds can be oxidized than in traditional scrubbing, which relies upon the autogeneous oxidation reaction of the hypochlorite ion. Scrubbing efficiency with and without catalyst is illustrated in the sludge thickening application table.

Initial development of the process was carried out on the Pilot-plant at Billingham followed by trials on commercial sites around the UK.

The following tables of data demonstrate the typical performance achieved in a number of trials on sewage treatments works (STW).

H2S removal (STW in South of England)

 

H2S in
(ppb v/v)

H2S out
(ppb v/v)

Reduction
(%)

Odour in
(OU/m3 )

Odour out
(OU/m3)

Reduction
(%)

A

70,000

13

>99.9

>630,000

<100

>99

B

70,000

8

>99.9

>630,000

1,160

>99

C

90,000

nd

>99.9

>630,000

1,900

>99

D

90,000

nd

>99.9

>630,000

2,200

>99

GCMS data for sulphides and VOC removal (STW South of England)

Pollutant

Inlet concentration
(µg/m3 )

Outlet concentration
(µg/m3 )

Reduction
(%)

Methyl mercaptan

45

0.1

99.8

Dimethyl sulphide

26

nd

>99.9

Carbon disulphide

35

3.1

91.1

Acetic acid

150

nd

>99.9

Dimethyl disulphide

1,730

3.4

99.8

Triethyl amine

170

24

85.9

Dimethyl trisulphide

560

nd

>99.9

Limonene

390

nd

>99.9

Dimethyl tetrasulphide

96

nd

>99.9

Methyl naphthalenes

260

20

92.1

C9-C12 alkenes

2,170

383

82.4

GCMS data for sulphides and VOC removal (STW North of England)

Pollutant

Inlet concentration (µg/m3)

Outlet concentration (µg/m3)

Hydrogen sulphide

18,300

30

Toluene

60

<10

Undecane

180

<10

Cycloheptatriene

160

70

Methyl cyclohexane

1,500

500

Dimethyl disulphide

120

<10

Dimethyl trisulphide

120

<10

Dimethyl tetrasulphide

140

<10

S-methyl methane thiosulphate

25

<10

Sewage: sludge thickening application

 

Without catalyst

With catalyst ODORGARD

Contaminant

Odour
(T.L.V. µg/m3)

Feed
(µg/m3)

Removal
(%)

Feed
(ppb v/v)

Removal
(%)

Hydrogen sulphide

0.67

44,600

96.9

40,200

99.8

Methyl mercaptan

2.1

290

78.3

15

>99.3

Dimethyl sulphide

5.9

540

<1.0

210

>99.9

Dimethyl disulphide

48

3,800

<1.0

1,250

97.3

Dimethyl trisulphide

8.7

530

<1.0

390

>99.9

Dimethyl tetrasulphide

unknown

20

15

31

>99.7

Carbon disulphide

300

30

<1.0

22

74.5

Compounds such as ammonia and amines are oxidized over the catalyst. The lower hypochlorite concentrations of the ODORGARD process are not conducive to chlorination reactions. Laboratory studies also show that chlorinated compounds are destroyed over the catalyst.

ODORGARD commercial units: meat renderer

 

Concentration (ppm v/v)

Inlet

Outlet

Ammonia

10

nd(<0.5)

Amines

4

nd(<0.05)

Mercaptans

0.5

nd(<0. 1)

Hydrogen sulphide

0.5

nd(<0.05)

Odour

-

none perceived

Cost effective, reliable and proven in large scale commercial use, the ODORGARD process offers unique performance advantages and efficient chemical use across a range of industries where odour is traditionally a major problem - satisfying both their needs as well as public demand for a cleaner, 'odour free' environment.

Industrial processes which produce odours and/or a low-level VOC's in a vent gas can benefit from the ODORGARD process. Any process currently using traditional hypochlorite scrubbers could improve abatement performance by retrofitting a catalytic reactor, for example in: sewage treatment, composting facilities, animal rendering, animal feed, leather and tanning, food and drink, tobacco, natural product processing, foundry, paints and resins, pulp and paper.

There are more than 90 units installed world-wide with both major global companies and smaller, sometimes family-owned companies.

Literature
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