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How does the regulation in Denmark affect the requirements for small sewer

systems in rural areas?

Inge FaldagerDanish Technological Institute, Denmark

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Background for the regulation in Denmark

• In the middle of the 1990 the• In the middle of the 1990 the receiving water in rural areas were polluted

• 50% of the rivers and 2/3-3/4 of the lakes did not fulfilled the requirements

• A special law was prepared for improving the condition of receiving waters in rural areas

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Regulation nr. 325 1995

• All receiving waters were classified in regional plans• All receiving waters were classified in regional plans

• Sensitive area, where improvements had to be made shall be incorporated in the sewer plans for every municipality in Denmark

• With this done, there is authority to demand improvement onWith this done, there is authority to demand improvement on every single property, that does not fulfill these environmental requirements

• An investigation is required of every single property before the demand is legal

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Classifications for the purification

Purification class BI5 Total fosfor NitrifikaionPurification class BI5 Total fosfor Nitrifikaion

SOP 95 % 90 % 90 %

SO 95 % 90 %

OP 90 % 90 %

O 90 %

O: Reduktion af organisk stof OP: Reduktion af organisk stof og fosforSO: Skærpet krav til reduktion af organisk stof samt nitrifikation SOP: Skærpet krav til reduktion af organisk stof og fosfor samt nitrifikation

Purification classes

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Demands for substance reduction in different purification classes

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It is the receiving water, that decide the level of classification

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Who is paying?

1 The owner pay and have the responsibility for the plant1. The owner pay, and have the responsibility for the plant

2. The owner choose to be a member of the sewer company. The sewer company pay the installation, and do the maintenance. The owner pay to be connected (23.000 Danishmaintenance. The owner pay to be connected (23.000 Danish kr.) and a tax pr. m3 wastewater every year

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• In Denmark we have

How big is the problem?

• In Denmark we have 360.000 single properties in the open country

• 96.000 will be asked to improve their sewers

• Implementing of the water frame directive will add 14.000 properties

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• Sewer systems (pressure sewer systems) (SOP)

Possible solutions

• Sewer systems (pressure sewer systems) (SOP)

• Soil infiltration systems (SOP)

• Mini waste water treatment plants (from S to SOP)

• Sand filter systems (SO)

• Willow plants (SOP)

• Others (Filtralite, soil/plant systems) (SO)

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Pressure sewer systems

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Soil infiltration systems

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Soil infiltration systems - pumping

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Mini waste water treatment pants

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Sand filter systems

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Willow plants

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Willow plants

1,1 m 1,2 m 1,1 m1,1 m 1,1 m

8 m

0,3 m

MEMBRANFORDELERRØR

1,1 m 1,1 m1,1 m 1,1 m

8 m

0,3 m

MEMBRANFORDELERRØR1,5 m

FORDELERRØR

TØMMEDRÆN

5 m

1,5 m

TØMMEDRÆN

5 m

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Soil/plant systems

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• NATURren-anlæg

Other types of plants

• NATURren-anlæg• Vejledning efter MST- anvisning

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• Denmark has national guidelines for all the normally used

Are we sure of the quality?

• Denmark has national guidelines for all the normally used types of plants

• Denmark has a compulsory type approval for mini waste water treatments plants, that goes beyond the CE-mark

• Denmark has demands on septic tanks, that goes beyond theDenmark has demands on septic tanks, that goes beyond the CE-mark

• Denmark have compulsory authorization for all contractors working with private sewer systems

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Thank you for your attention

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