환경영향평가 등록
환경영향평가
환경영향평가 - 미리보기를 참고 바랍니다.
WWTPs should given here. Table 10.1 shows the results of some hundred measurement results from different parts of different WWTPs(Frechen 2000).
Table 10.1. Overview over specific odorant flow rates from wastewater treatment plant sources.
Specific odorant from
ou/()
flow rate to
ou/()
Part of plant
Water surface influent channel
200
1,200
Aerated grit chamber
500
20,000
Grease trap
2,000
40,000
Screening
1,000
5,000
Grease from grease trap
1,000
15,000
Sand from grit chamber
1,000
6,500
Primary sedimentation tank: surface
500
4,000
Primary sedimentation tank: weir area
500
5,000
Aeration tank: anaerobic part
850
3,000
Aeration tank: anoxic part
600
2,000
Aeration tank: aerobic part
300
1,700
Final sedimentation tank
150
500
Filtration
100
200
Primary sludge thickener
12,000
35,000
Stabilised sludge thickener
500
5,000
Stabilised sludge, dewatered
600
16,000
Some additional remarks are necessary. The range given in this table should be understood as a "usual range" under normal conditions at a well operated plant without major industrial influent and other specific, odour-relevant circumstances. In specific cases, this range may be exceeded, which means that at specific sites values may be measured that are below the given lower value or above the given higher value.
Some of the most important remarks concerning the area sources mentioned in the table as well as concerning some other, non-area sources, are given below.
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Influent area (including pumping station, screen, grit chamber and grease trap): emissions here depend strongly on the plant and process design, i.e. whether or not filtrate, sludge liquor, liquids from night soil/septic tanks and others are discharged into this part of the plant - values up to 75,000 ou/() were measured already.
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Grease trap and grease container: even higher values are likely depending upon plant operation and maintenance.
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Air inside building for screen and influent pumping machines: measurement results ranging from 50 ou/ to 400 ou/ with natural ventilation do indicate that air treatment presumably will not make sense, as no remarkable reduction of total plant emissions will be possible. Note: values up to 6,700 ou/ were measured!
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Stormwater tanks: under regular (usually observable) conditions, during filling phase emissions may be slightly below those of primary sedimentation tanks. During the rest of the year, one may assess the emission to be zero or up to 1,000 ou/(), depending upon installation and operation.
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Anaerobic operated basins for biological phosphorus removal: values between 15,000 ou/() and 50,000 ou/() were measured.
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Primary sedimentation tank: high emissions from the liquid surface can often be avoided by correct operation of the tanks, see chapter4.
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Final sedimentation tanks: usually no countermeasures will make sense except in very extreme cases. Final sedimentation odours belong t
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