Greater Treatment Capacity in Wastewater Treatment Plant

Experience has shown that in treatment plants using sludge treatment reed beds 5-15% of treatment plant capacity is freed at no extra cost. This is due to the fact that the return liquors from the reed bed are much cleaner than those produced in mechanical dewatering systems. This also means improved purification and reduction of discharge to the environment generally (Figure 2).

Table 1 Reduction of LAS and NPE achieved using various methods

NPE

LAS

Methods

(%)

(%)

Sludge reed bed

93

98

Long-term container storage (depth

~10

~41

0-120 cm)

Long-term container storage (depth

61

75

0-20 cm)

Long-term container storage (depth

~0

20-120 cm)

Pile storage with mechanical turning

43

90

Composting

78-95

100

Mechanical aeration

75-95

95

regulate the content of hazardous organic compounds in sewage sludge being spread on agricultural land. The legislation was brought into effect after an extensive survey which demonstrated that hazardous organic compounds such as linear alkylbenzene sulfonates (LASs) and nonylphenolethoxylates (NPEs) may be detrimental to the environment if spread in inappropriately large concentrations. In 2002, stricter legislation was passed, reducing the permissible concentrations for LAS and NPE to 1300 and 10mgkg_1 dry matter, respectively (Table 1).

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