Local and global environmental advantages

2.000 tonnes DS

Agriculture

Reed bed

Central drying

Source: Kolding VVM- vurdering:

treatment

and incineration

Emissions: (t yr-1)

CO2 t yr-1

157

37

335

NOx kg yr-1

735

235

200 000

SO2 kg yr-1

~0

~0

10 000

Smell:

Spreading on crop field

Yes

No

Container transport

Yes

No

Yes

Flue gas/smoke

Yes

No

Yes

Traffic:

Number of trucks

910

300

1010

External noise:

Ventilation + cars

Yes

No

Yes

Other considerations

Spreading

Emptying

Yes

Internal environment:

Chemical risks

Yes

No

Yes

Heavy traffic

Yes

No

Yes

Dangerous machines

Middle

Few

Many

Noise

Middle

Low

High

Residual substances:

Pathogens

Yes

No

No

Heavy metals

Unchanged

Unchanged

Flue gas/ash?

Hazard compounds

-Unchanged

Reduced

Ash residue?

Figure 2 Local and global environmental advantages.

In general, the sludge type is surplus activated sludge and surplus activated sludge mixed with anaerobically digested (mesophilic) sludge. The sludge loading amounts to a maximum of 50-60 and 40-50 kg DS m~2 yr_1, respectively. Loading cycles are related to the sludge type and the age of the sludge. The sludge residue will, after approximately 10 years of operation, reach an approximate height of 1.2-1.5 m with an approximate dry solids content of 30-40%.

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